CN112847450B

CN112847450B - Hair trimmer

Info

Publication number: CN112847450B
Application number: CN202110159336.2A
Authority: CN
Inventors: 程祺然; 程钲淇
Original assignee: Ningbo Bofa Intelligent Technology Co ltd
Current assignee: Ningbo Bofa Intelligent Technology Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-08-05
Anticipated expiration: 2041-02-05
Also published as: CN112847450A

Abstract

The invention relates to a hair trimmer, which comprises a trimmer main body, a cutting head assembly, a motor and a joint assembly, wherein the motor and the joint assembly are installed in the trimmer main body. The joint assembly is divided into the driving seat and the swing arm, the driving seat and the swing arm are respectively processed and manufactured, the manufacturing requirement is relatively low, and the driving seat and the swing arm are assembled together after being processed; the lower end of the mounting groove is open so as to facilitate mounting between the driving seat and the eccentric bearing, and the top of the mounting groove is closed so as to enhance structural force, prevent the driving seat from deforming under stress, prevent dust from falling in and ensure good lubricating effect; the original function functions of three parts, namely the pressure spring plate, the slidable independent locking hook and the torsion spring part, are optimized and combined into a spring plate clamping hook integrated part, so that the number of parts and assembly procedures are reduced, the assembly workload and the use failure rate can be effectively reduced, the working efficiency is greatly improved, and the disassembly and the assembly are convenient; the lateral wall of guide part is the arc surface, makes things convenient for the later stage assembly, can also effectively reduce assembly error.

Description

Hair trimmer

Technical Field

The invention relates to the technical field of hair trimmers, in particular to a hair trimmer.

Background

Hair trimmers typically include a set of stationary blades and an adjacent set of moving blades that oscillate from side to side relative to the stationary blades to sever hairs protruding between the two sets of blades.

Patent (publication No. CN 103568036 a) discloses a trimmer comprising: a trimmer body; a rotary drive within the body; a cutter head assembly interconnected with the trimmer body; and a drive member operatively interconnecting the rotary drive and the cutting head assembly to convert rotary motion of the rotary drive into oscillation of a portion of the cutting head assembly relative to another portion of the cutting head assembly, the drive member including an injection molded transmission and an injection molded hinge; wherein the transmission includes a cam follower driven by the rotary drive and a drive rod engaged with a portion of the cutting head assembly; wherein the hinge comprises a mounting structure for mounting the drive member to the trimmer body and a plurality of webs supporting the transmission for oscillating movement; and wherein one of the transmission and the hinge is injection molded over a portion of the other to mechanically couple the transmission and the hinge. The existing trimmer also supports the transmission device through a plurality of webs of the hinge piece to perform swing motion, the manufacture of the hinge piece is complicated, and the process requirement is high.

Its locking structure of current hair trimmer is shown in fig. 12, it is connected with blade installation fixing base 26 to rotate on blade connection ox ear 25, then install a pressure spring board 32 and the independent locking couple 31 of slidable on blade installation fixing base 26, be provided with the elasticity trip 28 that is used for catching on blade installation fixing base 26 and blade connection ox ear 25 on the independent locking couple 31, pressure spring board 32 is used for restricting the gliding position of independent locking couple 31, independent locking couple 31 one end is connected with the torsion spring spare, make elasticity trip 28 can catch on blade installation fixing base 26 and blade connection ox ear 25. The locking structure is high in cost, multiple in assembly steps, prone to error, complex in disassembly and assembly, prone to damage caused by misoperation and high in machining precision requirement. In addition to the above problems, there are other problems of the hair trimmer such as pressure rise and pressure drop.

Disclosure of Invention

The invention aims to solve the technical problem of providing a hair trimmer, which divides a joint component into a driving seat and a swinging arm, wherein the driving seat and the swinging arm are respectively processed and manufactured, the manufacturing requirement is relatively low, and the driving seat and the swinging arm are assembled together after being processed.

The technical scheme adopted by the invention for solving the technical problems is as follows: the hair trimmer comprises a trimmer main body, a cutting head assembly, a motor and a joint assembly, wherein the cutting head assembly is connected with the trimmer main body, the motor and the joint assembly are installed in the trimmer main body, the cutting head assembly is connected with the motor through the joint assembly, the joint assembly comprises a driving rod, a driving seat and swing arms, the end portion of the motor is provided with a joint, the two sides of the joint are respectively connected with a swing arm in a rotating mode, the two sides of the driving seat are respectively connected with the two swing arms in a rotating mode, the middle of one end of the driving seat is provided with the driving rod which inclines downwards, the driving rod drives the cutting head assembly to do cutting movement, and the other end of the driving seat is eccentrically connected with the motor.

As a supplement to the technical scheme of the invention, the middle part of the other end of the driving seat is provided with a mounting groove, and an output shaft of the motor is provided with an eccentric bearing which extends into the mounting groove.

As a supplement to the technical scheme of the invention, the mounting groove is a rectangular groove, the lower end of the mounting groove is open, and the top of the mounting groove is closed. The lower end of the mounting groove is open to facilitate mounting between the driving socket and the eccentric bearing. The top of mounting groove seals and to strengthen structural force, prevents that the drive seat atress from warping, can also prevent that the dust from falling into, guarantees lubricated effectual effect.

As a supplement to the technical scheme of the invention, one end of the swing arm is provided with a sleeve, a wear-resistant sleeve is arranged in the sleeve, and a screw pin connected with one side of the joint is arranged in the wear-resistant sleeve. The wear-resistant sleeve and the screw pin are subjected to frequent rotation friction, and the wear-resistant sleeve is made of a wear-resistant material, so that the service life of the wear-resistant sleeve can be effectively prolonged.

As a supplement to the technical scheme of the invention, the cutting head assembly comprises a movable blade, a blade connecting bracket, a blade mounting fixing seat and a fixed blade, the end of the trimmer main body is fixedly provided with the blade mounting fixing seat, the end of the trimmer main body is positioned at the outer side of the blade mounting fixing seat and is rotatably provided with the fixed blade, the fixed blade is provided with the movable blade and the blade connecting bracket which move transversely and reciprocally, the movable blade is connected with the driving rod, the blade mounting fixing seat is buckled with the blade connecting bracket, the blade mounting fixing seat is provided with a spring plate clamping and hooking integrated piece, one end of the spring plate clamping and hooking integrated piece is provided with an elastic clamping hook, and the elastic clamping hook is used for clamping the blade mounting fixing seat and the blade connecting bracket together.

As a supplement to the technical scheme of the invention, one end of the elastic clamping hook is connected with the integrated part of the spring plate clamping hook, and the other end of the elastic clamping hook is provided with a guide part.

As a supplement to the technical solution of the present invention, the outer side wall of the guide portion is an arc surface or an inclined surface.

As a supplement to the technical solution of the present invention, the interior of the trimmer body is installed with a circuit board and a lithium battery connected with the circuit board, and the outside of the trimmer body is provided with a switch connected with the circuit board.

As a supplement to the technical scheme of the invention, the circuit board is provided with a booster circuit module, the booster circuit module comprises a charging booster circuit, a voltage stabilizing circuit, a control circuit and a drive circuit, and the charging booster circuit is used for boosting a direct current voltage to a lithium battery constant current charging voltage; the input end of the voltage stabilizing circuit is connected with the output end of the charging booster circuit, and the output end of the voltage stabilizing circuit is connected with the control circuit and used for stabilizing the voltage boosted by the charging booster circuit to the voltage required by the control circuit; the control circuit is used for sending a control signal to the drive circuit; the drive circuit is used for driving the motor.

As a supplement to the technical scheme of the present invention, the circuit board is provided with a voltage reduction circuit module, the voltage reduction circuit module comprises a rectification filter circuit, a voltage reduction circuit and a driving circuit which are connected in sequence, and an input end of the rectification filter circuit is connected with an alternating current power supply and is used for converting alternating current into direct current; the voltage reduction circuit is used for converting the voltage of the direct current converted by the rectifying filter circuit into a voltage suitable for the driving circuit; the drive circuit is used for driving the motor.

Has the advantages that: the invention relates to a hair trimmer, which has the following advantages:

1. the joint assembly is divided into a driving seat and a swinging arm, the driving seat and the swinging arm are respectively processed and manufactured, the manufacturing requirement is relatively low, and the driving seat and the swinging arm are assembled together after being processed;

2. the wear-resistant sleeve and the screw pin are subjected to frequent rotation friction, and the wear-resistant sleeve is made of a wear-resistant material, so that the service life of the wear-resistant sleeve can be effectively prolonged, the failure rate is reduced, and the after-sale maintenance workload is reduced;

3. the lower end of the mounting groove is open so as to facilitate mounting between the driving seat and the eccentric bearing, and the top of the mounting groove is closed so as to enhance structural force, prevent the driving seat from deforming under stress, prevent dust from falling in and ensure good lubricating effect;

4. the original function functions of three parts, namely the pressure spring plate, the slidable independent locking hook and the torsion spring part, are optimized and combined into a spring plate clamping hook integrated part, so that the number of parts and assembly procedures are reduced, the assembly workload and the use failure rate can be effectively reduced, the working efficiency is greatly improved, the reliability is better, the assembly and disassembly are convenient, and blades with different thicknesses and sizes are replaced;

5. the outer side wall of the guide part is an arc surface, so that later assembly is facilitated, and assembly errors can be effectively reduced;

6. boosting is carried out in a direct current boosting mode, an original alternating current power adapter is eliminated, the requirement of charging through a USB interface is met, the use is convenient, and in addition, the motor can be ensured to obtain sufficient power through a secondary boosting mode;

7. the household alternating current is converted into the direct current through the rectifier filter circuit, the safe voltage reduction is realized, the transformer is recycled to be coupled and reduced in voltage, the direct current voltage used safely is obtained, the user safety and the uninterrupted output of energy are guaranteed, the endurance time is prolonged, in addition, the voltage stabilization is further carried out on the primary coil of the transformer, and the stability of the voltage is guaranteed.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the structure of the motor, the joint and the eccentric bearing according to the present invention;

FIG. 4 is a schematic structural view of a joint assembly according to the present invention;

FIG. 5 is a schematic view of the joint assembly of the present invention at various angles;

FIG. 6 is a schematic view of a cutting head assembly according to the present invention;

FIG. 7 is a schematic view of the movable blade, the collapsing elements, the blade attachment ears and the stationary blade of the present invention;

FIG. 8 is a schematic view of the spring plate hook assembly of the present invention;

FIG. 9 is a schematic view of the blade mounting anchor and spring plate hook of the present invention being attached to a trimmer;

FIG. 10 is an enlarged fragmentary view of FIG. 9 of the present invention;

FIG. 11 is a schematic view of a blade attachment tab according to the present invention;

FIG. 12 is a schematic view of a partial structure of the present invention before improvement;

FIG. 13 is a partial schematic view of the present invention before improvement;

fig. 14 is a circuit diagram of a first embodiment of a booster circuit module according to the present invention;

FIG. 15 is a circuit diagram of a second embodiment of a boost circuit module according to the present invention;

fig. 16 is a circuit diagram of the step-down circuit block according to the present invention.

The figure is as follows: 1. a driving rod, 2, a driving seat, 3, a pin shaft, 4, a swing arm, 5, a wear-resistant sleeve, 6, a screw pin, 7, a sleeve, 8, a circular inner groove, 9, a mounting groove, 10, an anti-deformation weight-reducing groove, 11, a reinforcing rib, 12, a step, 13, a trimmer body, 14, a joint, 15, a cutting head assembly, 16, a motor, 17, an eccentric bearing, 18, a joint assembly, 19, a switch, 20, a circuit board, 21, a lithium battery, 22, a soft rubber sleeve, 23, a movable blade, 24, a flattening component, 25, a blade connecting lug, 26, a blade mounting and fixing seat, 27, a spring plate clamping hook integrated piece, 28, an elastic clamping hook, 29, a fixed blade, 30, a rectangular frame, 31, an independent locking hook, 32, a pressure spring plate, 33, a guide part, 34, a circular arc surface, 35, a rotating shaft, 36, a slope, 37, a charging booster circuit, 38 and a voltage stabilizing circuit, 39. the circuit comprises a control circuit 40, a driving circuit 41, a rectifying and filtering circuit 42 and a voltage reduction circuit.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

The embodiment of the invention relates to a hair trimmer, which comprises a trimmer body 13, a cutting head assembly 15, a motor 16 and a joint assembly 18, wherein the cutting head assembly 15 is connected with the trimmer body 13, the motor 16 is installed in the trimmer body 13, the cutting head assembly 15 is connected with the motor 16 through the joint assembly 18, the joint assembly 18 comprises a driving rod 1, a driving seat 2 and a swing arm 4, the end part of the motor 16 is provided with a joint 14, both sides of the joint 14 are rotatably connected with a swing arm 4, both sides of the driving seat 2 are respectively rotatably connected with the two swing arms 4, the middle part of one end of the driving seat 2 is provided with the driving rod 1 inclining downwards, the driving rod 1 drives the cutting head assembly 15 to do cutting motion, and the other end of the driving seat 2 is eccentrically connected with the motor 16.

The outer side of the middle of the trimmer main body 13 is sleeved with a soft rubber sleeve 22, and the soft rubber sleeve 22 is provided with a plurality of friction bulges, so that the slippage can be reduced when the trimmer main body 13 is held by hands.

The inside radiator fan that is equipped with of motor 16, can effectively accelerate motor 16 heat dissipation, improve motor 16's performance and life, carry out heat dissipation lithium cell 21 to lithium cell 21 simultaneously, prolong lithium cell 21's working life, improve battery reliability and security.

The middle part of the front end of the driving seat 2 is provided with a driving rod 1 inclining downwards, and the driving rod 1 is arranged downwards in an inclined way from the back to the front direction, as can be clearly understood in fig. 4. The middle part of the rear end of the driving seat 2 is provided with a mounting groove 9, the middle part of the front end face of the mounting groove 9 is provided with an anti-deformation and weight-reducing groove 10, the anti-deformation and weight-reducing groove 10 is used for reducing the weight of the driving seat 2, and the anti-deformation and weight-reducing groove 10 can also store lubricating grease.

The swing arm 4 is rotatably connected with the driving seat 2 through a pin shaft 3. Besides the pin shaft 3, the swing arm 4 can be rotatably connected with the driving seat 2 through other connecting pieces.

The middle part of the other end of the driving seat 2 is provided with a mounting groove 9, an output shaft of the motor 16 is provided with an eccentric bearing 17, the eccentric bearing 17 extends into the mounting groove 9, and the rotation of the eccentric bearing 17 can force the movable blade 23 to do reciprocating motion and swing shearing action. The pressing part 24 serves to press the movable blade 23 so that the movable blade 23 can reciprocate only in a lateral direction. The eccentric bearing 17 may be replaced by an eccentric shaft or an eccentric wheel.

The mounting groove 9 is a rectangular groove, the lower end of the mounting groove 9 is open, and the top of the mounting groove 9 is closed. The lower extreme of mounting groove 9 is opened and is for the installation between convenient drive seat 2 and the eccentric bearing 17, and the top of mounting groove 9 is sealed and can be strengthened structural force, prevents drive seat 2 atress deformation, can also prevent that the dust from falling into, guarantees lubricated effectual effect, is favorable to product overall stability, noise abatement.

One end of the swing arm 4 is provided with a sleeve 7, a wear-resistant sleeve 5 is arranged in the sleeve 7, and a screw pin 6 connected with one side of the joint 14 is arranged in the wear-resistant sleeve 5. The wear-resistant sleeve 5 and the screw pin 6 are subjected to frequent rotation friction, and the wear-resistant sleeve 5 is made of a wear-resistant material, so that the service life of the wear-resistant sleeve 5 can be effectively prolonged.

A circular inner groove 8 is formed in an opening in the upper end of the sleeve 7, the aperture of the circular inner groove 8 is larger than that of an inner hole of the sleeve 7, the circular inner groove 8 and the inner hole of the sleeve 7 are arranged concentrically, and a circle of step 12 matched with the circular inner groove 8 is arranged on the side wall of the upper end of the wear-resistant sleeve 5. The step 12 and the circular inner groove 8 are matched to limit the position of the wear-resistant sleeve 5, and axial shaking of the wear-resistant sleeve 5 is reduced.

The upper end and the lower end of the swing arm 4 are both provided with reinforcing ribs 11 along the length direction, and one end of each reinforcing rib 11 is connected with the side wall of the sleeve 7. The reinforcing ribs 11 are additionally arranged to ensure the connection strength and stability between the swing arm 4 and the sleeve 7. The reinforcing rib 11 positioned at the upper end of the swing arm 4 is in a slope shape, because the distance between the upper end surface of the swing arm 4 and the upper end surface of the sleeve 7 is larger; the reinforcing rib 11 positioned at the lower end of the swing arm 4 is in a long strip shape, one end of the reinforcing rib 11 is connected with the side wall of the sleeve 7, the other end of the reinforcing rib 11 is also in a slope shape, and pressure acting on the driving rod 1 and the blade can be generated because the distance between the upper end face of the swing arm 4 and the upper end face of the sleeve 7 is small.

Swing arm 4, strengthening rib 11 and sleeve 7 integrated into one piece, guarantee joint strength and stability between swing arm 4, strengthening rib 11 and the sleeve 7 three.

The joint assembly is divided into the driving seat 2 and the swing arm 4, the driving seat 2 and the swing arm 4 are respectively machined and manufactured, the manufacturing requirement is relatively low, the driving seat 2 and the swing arm 4 are assembled together after machining is finished, the swing arm 4 is rotatably connected with the driving seat 2, the installation groove 9 is sleeved outside the eccentric bearing 17, the wear-resistant sleeve 5 is arranged in the sleeve 7 of the swing arm 4, the wear-resistant sleeve 5 is tightly connected with the sleeve 7, the wear-resistant sleeve 5 is fixed with the joint 14 through the screw pin 6, the swing arm 4 and the wear-resistant sleeve 5 rotate around the screw pin 6 together, the screw pin 6 plays a role of a shaft, and the sleeve 7 and the wear-resistant sleeve 5 are buffered and are rotated and supplemented. The screw stud 6 may be replaced by another connecting member, just to function as a shaft.

Cutting head subassembly 15 include movable blade 23, blade connection ox ear 25, blade installation fixing base 26 and fixed

blade

29, 13 tip fixed mounting of trimmer main part have blade installation fixing base 26, this 13 tip of trimmer main part is located the outside of blade installation fixing base 26 and rotates and install fixed blade 29, fixed blade 29 on install horizontal reciprocating motion's movable blade 23 and blade connection ox ear 25, movable blade 23 link to each other with actuating lever 1, blade installation fixing base 26 and blade connection ox ear 25 lock, install the integrative piece 27 of spring plate trip on this blade installation fixing base 26, the integrative one end of the integrative piece 27 of spring plate trip be provided with elasticity trip 28, this elasticity trip 28 is detained blade installation fixing base 26 and blade connection ox ear 25 together. The flattening member 24 and the blade attachment ears 25 are fixed to the fixed blade 29 by screws.

The spring plate clamping hook integrated piece 27 and the blade mounting and fixing seat 26 are riveted and fixed through screws or other fixing modes.

The other end of the blade mounting fixing seat 26 is provided with a rectangular frame 30, and the elastic clamping hook 28 is positioned in the rectangular frame 30. Rectangular frame 30 serves to limit the range of lateral movement of the joint. The blade mounting holder 26 may be an open type with a rectangular frame 30 or without a frame, and is not limited to the one with a frame.

One end of the elastic hook 28 is connected with the spring plate hook integrated piece 27, and the other end of the elastic hook 28 is provided with a guide part 33.

The outer side wall of the guide part 33 is a circular arc surface 34 or an inclined surface.

The elastic hook 28 and the guide part 33 are integrally formed.

The spring plate hook integrated piece 27 and the elastic hook 28 are integrally formed.

The invention optimizes and combines the function of three parts of the original pressure spring plate 32, the slidable independent locking hook 31 and the torsion spring part into a spring plate clamping hook integrated part 27, reduces the number of parts and assembly procedures, can effectively reduce the assembly workload and the use failure rate, greatly improves the working efficiency, has better reliability and is convenient to disassemble and assemble. During the equipment, adopt riveting fixed earlier between the integrative piece of spring plate trip 27 and blade installation fixing base 26, then catch the blade with the elasticity trip 28 of the integrative piece of spring plate trip 27 and connect ox ear 25 and blade installation fixing base 26, easy operation, simple to operate. The position A shown in FIG. 6 is a riveted joint.

As shown in fig. 9, the blade mounting holder 26 and the spring plate hook integrated member 27 are fixed to the trimmer, and the lower portion of the blade mounting holder 26 is provided with the rotating shaft 35, as shown in fig. 10, the movable blade 23, the blade connecting ears 25 and the fixed blade 29 are assembled, and then the movable blade and the fixed blade are assembled into the assembly shown in fig. 9, the lower portion of the blade connecting ears 25 is buckled with the rotating shaft 35, and the upper portion of the blade connecting ears 25 is buckled along the arc surface 34 of the guide portion 33 until the elastic hook 28 is buckled on the slope 36. The circular arc surface 34 is arranged, so that assembly errors can be effectively reduced.

The trimmer main body 13 is internally provided with a circuit board 20 and a lithium battery 21 connected with the circuit board 20, and the outside of the trimmer main body 13 is provided with a switch 19 connected with the circuit board 20.

The first embodiment of the invention relates to a booster circuit for a hair trimmer, wherein a booster circuit module is arranged on the circuit board 20, the booster circuit module comprises a charging booster circuit 37, a voltage stabilizing circuit 38, a control circuit 39 and a drive circuit 40, and the charging booster circuit 37 is used for boosting a direct current voltage to a constant current charging voltage of a lithium battery 21; the input end of the voltage stabilizing circuit 38 is connected to the output end of the charging voltage-boosting circuit 37, and the output end of the voltage stabilizing circuit is connected to the control circuit 39, so as to stabilize the voltage boosted by the charging voltage-boosting circuit 37 to the voltage required by the control circuit 39; the control circuit 39 is used for sending a control signal to the drive circuit 40; the drive circuit 40 is used to drive the motor 16.

The charging and boosting circuit 37 adopts a boost management chip, a CS end of the boost management chip is connected with a +5V power interface through a resistor RS1, a VIN end is directly connected with the +5V power interface, a VCC end is connected with the +5V power interface through two capacitors C1 and C2 connected in series and two capacitors C1 and C2 are grounded, a FB end is connected with a +8.4V output voltage end through a resistor R3, a GND end is directly grounded, and a DR end is connected with the +8.4V output voltage end through a switching tube Q1. This +8.4V output voltage end is connected at the battery both ends, when +5V power interface connection USB interface, can be through current USB charging mode, utilize boost management chip to rise 5V voltage to 8.4V voltage, when the voltage of battery is less than 8.4V, it can realize the constant current and charge, when the voltage of battery is greater than or equal to 8.4V, stop charging, boost management chip through boost can carry out real time monitoring, ensure to charge stably.

The voltage stabilizing circuit 38 adopts an ht7550 voltage stabilizing chip, an input end IN of the ht7550 voltage stabilizing chip is connected with a +8.4V output voltage end of the charging and boosting circuit 37, and an output end OUT is connected with a power supply end VDD of the control circuit 39. The voltage stabilizing chip can stabilize +8.4V to the operating voltage of the control circuit 39, thereby providing a stable operating environment for the control circuit 39.

The control circuit 39 adopts an L6386 control chip, the VDD end of the L6386 control chip is connected with the output end OUT of the voltage stabilizing circuit 38, the VSS end is connected with the VDD end through a capacitor C7, the RA0-RA3 ends are connected with the indicator lamp circuit, the hair trimmer can be shown to be in different working states through four indicator lamps, the RA4 end is connected with the battery voltage detection end VF-BAT, so that the electric quantity of the battery can be monitored, the purpose of displaying the residual battery electric quantity can be realized, when the battery electric quantity is insufficient, the indicator lamps can be triggered to emit light with different colors to remind a user of charging, the RB3 end is connected with the drive circuit 40, and the rotation stop and start of the motor can be controlled through the RB3 end output PWM waves.

The driving circuit 40 is composed of a switch tube Q4, the control end of the switch tube Q4 is connected with the RB3 end of the control circuit 39, the output end of the switch tube Q3 is connected with the negative electrode end of the motor, the positive electrode end of the motor is connected with the +8.4V output voltage end of the charging booster circuit 37, the switch tube is controlled to be turned on or turned off through PWM waves, and therefore the motor is controlled.

Therefore, the invention boosts the voltage by a direct current boosting mode, eliminates the original alternating current power adapter, realizes the requirement of charging through a USB interface and is convenient to use.

The second embodiment of the present invention also relates to a voltage boosting circuit for a hair trimmer, as shown in fig. 15, which is different from the first embodiment in that the driving circuit 40 is provided with a two-stage voltage boosting circuit, the two-stage voltage boosting circuit adopts a CS7401 voltage boosting management chip, a VDD terminal of the CS7401 voltage boosting management chip is connected to a +8.4V voltage output terminal of the charging voltage boosting circuit 37, an EN terminal and an RO terminal are connected to the +8.4V voltage output terminal of the charging voltage boosting circuit 37 through a capacitor C5, a GND terminal is directly grounded, a DRV terminal is connected to a switching tube Q3, an output terminal of the switching tube Q3 is connected to two ends of the motor in parallel, and a control terminal of the motor is connected to an RB3 terminal of the control circuit 39. In the present embodiment, the +8.4V voltage obtained by the charging voltage-boosting circuit 37 is boosted again by the two-stage voltage-boosting circuit to obtain a +12V voltage, so that a larger power can be supplied to the motor.

The circuit board 20 is provided with a voltage reduction circuit module, the voltage reduction circuit module comprises a rectification filter circuit 41, a voltage reduction circuit 42 and a driving circuit 40 which are connected in sequence, and the input end of the rectification filter circuit 41 is connected with an alternating current power supply and is used for converting alternating current into direct current; the voltage reduction circuit 42 is used for converting the voltage of the direct current converted by the rectifying and filtering circuit 41 into a voltage suitable for the driving circuit 40; the drive circuit 40 is for the motor 16.

The rectifying and filtering circuit 41 includes a rectifying bridge sub-circuit and an EMI suppression circuit, wherein an input end of the rectifying bridge sub-circuit is connected to an ac power supply, an output end of the rectifying bridge sub-circuit is connected to an input end of the EMI suppression circuit, and an output end of the EMI suppression circuit is connected to an input end of the voltage reduction circuit 42. The rectifier bridge sub-circuit is composed of 4 diodes, and the EMI suppression circuit is composed of a capacitor C1, a resistor RL1, an inductor L1 and a capacitor C3. Ordinary household alternating current passes through an L/N line, is subjected to bridge rectification of a rectifier bridge sub-circuit, is filtered through the inductance filter circuit, and outputs smooth and stable direct current to be supplied to a lower-level circuit for use.

The voltage reducing circuit 42 includes a first RCD absorption sub-circuit and a transformer, an input terminal of the first RCD absorption sub-circuit is connected to an output terminal of the rectifying circuit, an output terminal of the first RCD absorption sub-circuit is connected to a primary coil of a transformer T1A, and a secondary coil of the transformer T1A is connected to the driving circuit 40. In this embodiment, a voltage regulator circuit 38 is also provided between the primary winding of the transformer and the output terminal of the rectifying and smoothing circuit 41.

The first RCD absorption sub-circuit consists of a resistor R7, a resistor R8, a capacitor C4, a resistor R9 and a diode D6; the voltage stabilizing circuit 38 is implemented by a voltage stabilizing chip. The first RCD absorption sub-circuit is used for performing follow current protection on the voltage stabilizing chip, and the power supply of the voltage stabilizing chip is provided by a circuit consisting of a resistor R5, a resistor R6, a resistor R2, a diode D5, a coil T1B and a capacitor C2. The CS end of the voltage stabilizing chip is also connected with a resistor R3 and a resistor R4, and the resistor R3 and the resistor R4 can protect the whole voltage stabilizing chip.

The driving circuit 40 comprises a second RCD absorption sub-circuit and a driving chip; the input end of the second RCD absorption sub-circuit is connected with the secondary coil of the voltage reduction circuit 42, and the output end of the second RCD absorption sub-circuit is respectively connected with the driving chip and the positive electrode of the direct current motor; the driving chip is used for generating PWM waves to control the rotating speed and the starting of the direct current motor. The second RCD absorption sub-circuit is composed of a diode D7, a resistor R11, a capacitor C5, a capacitor C6, a capacitor C8 and a resistor R14, the output end of the second RCD absorption sub-circuit is connected with the anode of the direct current motor, the output end of the second RCD absorption sub-circuit provides energy for the driving chip through the resistor R17 and the diode D2, a PWM wave output by a 5 th pin of the driving chip is connected with a control end of the direct current motor, and the control of the rotating speed and the starting of the direct current motor is achieved through the output of the PWM wave.

As can be easily found, the household alternating current is converted into the direct current through the rectifying and filtering circuit 41, safe voltage reduction is realized, and the transformer is used for coupling voltage reduction to obtain the safe use direct current voltage, so that the safety of users and the uninterrupted output of energy are ensured, and the endurance time is prolonged. In addition, the invention also stabilizes the voltage of the primary coil of the transformer and ensures the stability of the voltage.

Trimmer main part 13 on can set up two charging ports, an android charging port, another apple charging port.

Claims

1. A hair trimmer characterized in that: comprising a trimmer body (13), a cutting head assembly (15) interconnected with the trimmer body (13), a motor (16) mounted within the trimmer body (13) and a joint assembly (18), the cutting head assembly (15) is connected with the motor (16) through a joint assembly (18), the joint assembly (18) comprises a driving rod (1), a driving seat (2) and a swing arm (4), a joint (14) is arranged at the end part of the motor (16), both sides of the joint (14) are rotatably connected with a swing arm (4), both sides of the driving seat (2) are respectively rotatably connected with the two swing arms (4), a driving rod (1) which inclines downwards is arranged in the middle of one end of the driving seat (2), the cutting head assembly (15) is driven by the driving rod (1) to do cutting movement, and the other end of the driving seat (2) is eccentrically connected with the motor (16); the cutting head assembly (15) comprises a movable blade (23), a blade connecting lug (25), a blade mounting fixing seat (26) and a fixed blade (29), the end part of a trimmer main body (13) is fixedly provided with the blade mounting fixing seat (26), the end part of the trimmer main body (13) is positioned at the outer side of the blade mounting fixing seat (26) and is rotatably provided with the fixed blade (29), the fixed blade (29) is provided with the movable blade (23) which transversely reciprocates and the blade connecting lug (25), the movable blade (23) is connected with a driving rod (1), the blade mounting fixing seat (26) is buckled with the blade connecting lug (25), the blade mounting fixing seat (26) is provided with a spring plate clamping hook integrated piece (27), one end of the spring plate clamping hook integrated piece (27) is provided with an elastic clamping hook (28), the elastic clamping hook (28) buckles the blade mounting fixing seat (26) and the blade connecting lug (25) together.

2. A hair trimmer according to claim 1 wherein: the middle part of the other end of the driving seat (2) is provided with a mounting groove (9), an output shaft of the motor (16) is provided with an eccentric bearing (17), and the eccentric bearing (17) extends into the mounting groove (9).

3. A hair trimmer according to claim 2 wherein: the mounting groove (9) is a rectangular groove, the lower end of the mounting groove (9) is open, and the top of the mounting groove (9) is closed.

4. A hair trimmer according to claim 1 wherein: swing arm (4) one end be equipped with sleeve (7), install wear-resisting cover (5) in this sleeve (7), wear-resisting cover (5) internally mounted have with connect (14) one side continuous screw pin (6).

5. A hair trimmer according to claim 1 wherein: one end of the elastic clamping hook (28) is connected with the spring plate clamping hook integrated piece (27), and the other end of the elastic clamping hook (28) is provided with a guide part (33).

6. A hair trimmer according to claim 5 wherein: the outer side wall of the guide part (33) is an arc surface (34) or an inclined surface.

7. A hair trimmer according to claim 1 wherein: the trimmer is characterized in that a circuit board (20) and a lithium battery (21) connected with the circuit board (20) are mounted inside the trimmer main body (13), and a switch (19) connected with the circuit board (20) is arranged on the outer side of the trimmer main body (13).

8. The hair trimmer according to claim 7, wherein: the circuit board (20) is provided with a booster circuit module, the booster circuit module comprises a charging booster circuit (37), a voltage stabilizing circuit (38), a control circuit (39) and a drive circuit (40), and the charging booster circuit (37) is used for boosting a direct current voltage to a constant current charging voltage of the lithium battery (21); the input end of the voltage stabilizing circuit (38) is connected with the output end of the charging booster circuit (37), and the output end of the voltage stabilizing circuit is connected with the control circuit (39) and is used for stabilizing the voltage increased by the charging booster circuit (37) to the voltage required by the control circuit (39); the control circuit (39) is used for sending a control signal to the drive circuit (40); the drive circuit (40) is used for driving the motor (16).

9. The hair trimmer according to claim 7, wherein: the circuit board (20) is provided with a voltage reduction circuit module, the voltage reduction circuit module comprises a rectification filter circuit (41), a voltage reduction circuit (42) and a driving circuit (40) which are sequentially connected, and the input end of the rectification filter circuit (41) is connected with an alternating current power supply and used for converting alternating current into direct current; the voltage reduction circuit (42) is used for converting the voltage of the direct current converted by the rectifying and filtering circuit (41) into a voltage suitable for the driving circuit (40); the drive circuit (40) is used for driving the motor (16).