A handheld electric scissor with a built-in safety lock function

Abstract

The present invention discloses a handheld electric scissors with a self - contained safety lock function, which includes a handheld housing, a moving blade, a stationary blade, a motor, an LED lighting lamp, a power supply and a control system. The structure of the present invention is reasonably designed and has good heat dissipation. By providing a hollowed - out moving blade, the weight of the blade can be reduced, and the vibration and vibration noise of the whole machine can be decreased. By providing a cutting switch button and a lighting button, not only can the scissors function or the lighting function be started only according to requirements, but also the control system can control the electric scissors to be in a standby state or a safety state through the combination of the closing / opening timing sequences of the cutting switch button and the lighting button. This enables the user to conveniently turn on the machine and lock the body in the standby state, effectively preventing the device from being accidentally turned on by children and causing injuries, thus achieving the purpose of effectively preventing misoperations. Coupled with the high - low side - by - side arrangement of the cutting switch button and the lighting button in space, the use of the safety - locked state of this device is more convenient and fast, and has strong practicability.

Description

Technical Field

[0001] The present invention relates to the field of tools and instruments, and in particular to a hand-held electric scissors with a built-in safety lock function. Background Art

[0002] At present, to meet the diverse needs of the market, various electric scissors have emerged on the market. However, the existing electric scissors not only have a large noise and a strong vibration feeling, but also do not have a reasonable heat dissipation path, and there is no effective circulating convection mechanism between the air inside the casing motor and the air outside the casing. Prolonged use will affect the service life of the scissors. In addition, among the existing electric scissors, although some are provided with a lighting lamp on the blade body, the lighting lamp is not independently controlled; and, the control mechanical pressure switch of the current electric scissors is usually placed at the lower part of the handle. When pressing the cutting switch, the middle finger or the index finger needs to be lifted and pressed to form a "handshake" action. This "handshake" action is likely to cause the whole machine of the electric scissors to slightly move, resulting in accidental swinging of the cutting incision, thereby affecting the cutting accuracy; at the same time, the existing electric scissors have poor safety protection performance and do not consider the usage methods of special groups such as the elderly and children, and it is impossible to avoid the damage caused by the device being accidentally touched and turned on. Summary of the Invention

[0003] The purpose of the present invention is to provide a hand-held electric scissors with a built-in safety lock function, which has a reasonable structural design, is light in weight, has low noise and vibration, and has good heat dissipation performance.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a hand-held electric scissors with a built-in safety lock function, including a hand-held housing, a moving blade, a static blade, a motor, an LED lighting lamp, a power source and a control system. The static blade is fixedly installed at the front end of the hand-held housing. The moving blade is provided with a plurality of lightweight holes. The handle of the moving blade is connected to the output end of the motor through a swing rod mechanism. The motor can drive the moving blade to swing up and down; the motor and the power source are both arranged in the hand-held housing. The LED lighting lamp is arranged at the front end of the hand-held housing. The LED lighting lamp and the motor are both electrically connected to the power source; a cutting switch button and a lighting button respectively electrically connected to the motor and the LED lighting lamp are arranged on the outer surface of the hand-held housing. The cutting switch button and the lighting button are respectively signal-connected to the control system. The control system can control and process the switch timings of the cutting switch button and the lighting button. When the hand-held electric scissors are in the standby state, if the lighting button is pressed alone for a time exceeding t 阈值1 , the scissors enter the low-power lock state. If the cutting switch button and the lighting button are pressed simultaneously for a time exceeding t 阈值2, the scissors exit the low-power locked state and enter the standby state, and the standby static time of the hand-held electric scissors exceeds t 阈值3 , the scissors enter the low-power locked state. When both the LED lighting lamp and the motor are in the low-power locked state, the hand-held electric scissors with the built-in safety lock function are in the safe mode.

[0006] Optionally, the motor is connected to the swing rod mechanism through a planetary reduction gear.

[0007] Optionally, the swing rod mechanism includes a knife rotating shaft, a reciprocating vibrating rod, and an eccentric shaft. The knife rotating shaft is arranged at the front end of the hand-held housing, the handle of the moving blade is sleeved on the knife rotating shaft, upper swing rod sleeves and lower swing rod sleeves are respectively installed at the upper end and the lower end of the reciprocating vibrating rod, a swing rod slider is installed inside the reciprocating vibrating rod, the end of the handle is connected to the front end of the swing rod slider, and the output end of the planetary reduction gear passes through the eccentric shaft and is connected to the rear end of the swing rod slider.

[0008] Optionally, a motor centrifugal fan is arranged at the rear end of the motor, and a cabin isolation plate is arranged outside the motor. The cabin isolation plate is used to completely isolate the air inlet and the air outlet of the space outside the motor.

[0009] Optionally, a cabin air inlet and a cabin air outlet corresponding to the position areas of the motor air inlet and the motor air outlet are respectively opened on the side wall of the hand-held housing.

[0010] Optionally, sound-absorbing cotton is filled around the joints of the components in the swing rod mechanism, the joint of the swing rod mechanism and the eccentric shaft, and the joint of the moving blade and the swing rod mechanism.

[0011] Optionally, a wear-resistant and temperature-resistant composite layer, such as a Teflon coating, is coated on the contact part between the moving blade and the reciprocating vibrating rod.

[0012] Optionally, the hand-held housing includes a first housing, a second housing, and a third housing. The first housing and the second housing are docked in a flip-locking manner, the third housing is buckled in front of the first housing and the second housing, and both the static blade and the moving blade are installed on the third housing; a number of convex points distributed in an array are arranged on both sides and the lower side of the handle part of the hand-held housing.

[0013] Optionally, the motor is located in the middle of the handheld housing, the power supply is located at the rear of the handheld housing, an electronic control board is provided between the motor and the power supply, the shear switch button and the lighting button are arranged side by side from front to back on the electronic control board, the pressing area of the shear switch button is larger than that of the lighting button, both the shear switch button and the lighting button are located directly above the handheld housing, and the height at which the shear switch button protrudes from the top of the handheld housing is higher than the height at which the lighting button protrudes from the top of the handheld housing.

[0014] Optionally, a red indicator light and a green indicator light respectively connected to the control system by signal are arranged on the outer surface of the handheld housing; when the shear switch button or the lighting button is pressed in the low-power locked state, the red indicator light flashes; in the standby state, the green indicator light is always on.

[0015] The power supply is a lithium battery power supply, and an electronic control system with low-voltage protection and over-current protection functions is provided on the lithium battery power supply. When the lithium battery discharges to voltage U 下限 at this time, the electronic control system starts the protection program to prevent the lithium battery from being deeply over-discharged. At the same time, the warning led indicator light flashes to remind the controller to charge the lithium battery in time; when the discharge current of the lithium battery exceeds I 上限 at this time, the electronic control system starts the protection program to prevent the lithium battery from over-current discharging.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The handheld electric scissors with a built-in safety lock function provided by the present invention has a reasonable structural design. The control system can control the electric scissors to the standby state or the safe state by controlling the switch timing of the shear switch button and the lighting button, which not only enables the user to conveniently turn on the machine, but also can conveniently lock the machine body in the standby state; when the shear switch button or the lighting button is clicked in the locked state, the motor and the led lighting lamp do not work, which can effectively prevent the device from being accidentally turned on by children and causing injuries, achieving the purpose of effectively preventing misoperations. Coupled with the side-by-side arrangement of the shear switch button and the lighting button that is gradually larger and higher in space, the use of the safe locked state of the present device is more convenient and fast, and has strong practicability.

[0018] By setting the shear switch button and the lighting button to control the motor and the led lighting lamp respectively, not only can the scissor function or the lighting function be started only according to the demand, but also the problem of wasting electricity caused by the two being controlled uniformly and the lighting function still being turned on when lighting is not required during the day can be avoided.

[0019] By setting the moving blade to be hollowed out, the weight of the moving blade can be reduced, and thus the momentum of the reciprocating vibration of the moving blade during work can be reduced, fundamentally reducing the vibration of the whole machine, reducing the shock feeling of holding and the noise caused by vibration.

[0020] In addition, the present invention also provides a cabin isolation plate to completely isolate the motor air inlet and the motor air outlet, dividing the motor cavity into two regions. By using the motor centrifugal fan at the rear end of the motor, a positive pressure area at the rear and a negative pressure area at the front are naturally formed, promoting the forced circulation convection of the air inside the motor cavity and the air outside the cavity, avoiding the internal circulation of air, and having a good effect of motor heat dissipation; by controlling the materials of the contact parts between the tool handle and the swing rod, which are key parts of the movement, the power transmission, movement damping and noise can be reduced, which is beneficial to improving the electromechanical efficiency of the electric scissors. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a hand-held electric scissors with a built-in safety lock function according to the present invention;

[0023] Figure 2 It is an exploded view of a hand-held electric scissors with a built-in safety lock function according to the present invention;

[0024] Figure 3 It is an exploded view of a hand-held electric scissors with a built-in safety lock function according to the present invention;

[0025] Figure 4 It is an exploded view of the hand-held housing according to the present invention;

[0026] Figure 5 It is a circuit connection diagram of the control system, the shear switch button and the lighting button in the present invention;

[0027] Figure 6 It is a control flow chart of the control system in the present invention;

[0028] Among them, the reference numerals are: 1, hand-held housing; 1-1, first housing; 1-2, second housing; 1-3, third housing; 2, moving blade; 2-1, blade rotating shaft hole; 3, stationary blade; 4, motor; 5, LED lighting lamp; 6, power supply; 7, lightweight hole; 8, bump; 9, shearing switch button; 10, lighting button; 11, planetary reduction gear; 12, blade rotating shaft; 13, reciprocating vibration rod; 14, eccentric shaft; 15, upper swing rod sleeve; 16, lower swing rod sleeve; 17, swing rod slider; 18, motor centrifugal fan; 19, engine compartment partition board; 20, motor air inlet; 21, motor air outlet; 22, engine compartment air inlet; 23, engine compartment air outlet; 24, sound-absorbing cotton; 25, wear-resistant and temperature-resistant composite layer; 26, electronic control board. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The purpose of the present invention is to provide a hand-held electric scissors with a built-in safety lock function, which has a reasonable structural design, good safety performance, light weight, and good heat dissipation.

[0031] Based on this, the present invention provides a hand-held electric scissors with a built-in safety lock function, including a hand-held housing, a moving blade, a stationary blade, a motor, an LED lighting lamp, a power supply, and a control system. The stationary blade is fixedly installed at the front end of the hand-held housing. The moving blade is provided with a plurality of lightweight holes. The handle of the moving blade is connected to the output end of the motor through a swing rod mechanism. The motor can drive the moving blade to swing up and down. The motor and the power supply are both arranged in the hand-held housing. The LED lighting lamp is arranged at the front end of the hand-held housing. The LED lighting lamp and the motor are both electrically connected to the power supply. The outer surface of the hand-held housing is provided with a shearing switch button and a lighting button that are respectively electrically connected to the motor and the LED lighting lamp. The shearing switch button and the lighting button are respectively signal-connected to the control system. The control system can control the switching sequence of the shearing switch button and the lighting button. When the hand-held electric scissors are in the standby state, if the lighting button is pressed alone for more than t 阈值1 , the scissors enter the low-power locked state. If the shearing switch button and the lighting button are pressed simultaneously for more than t 阈值2 , the scissors exit the low-power locked state and enter the standby state. If the standby static time of the hand-held electric scissors with the built-in safety lock function exceeds t 阈值3 , the scissors enter the low-power locked state. When both the LED lighting lamp and the motor are in the low-power locked state, the hand-held electric scissors with the built-in safety lock function are in the safe mode.

[0032] The handheld electric scissors with a built-in safety lock function provided by the present invention has a reasonable structural design. By hollowing out the moving blade, the weight of the moving blade can be reduced, and the momentum of the reciprocating vibration of the moving blade during work can be reduced. Fundamentally, the vibration of the whole machine can be greatly reduced, and the vibration sensation during holding and the noise caused by vibration can be reduced. By setting a shear switch button and a lighting button to control the motor and the LED lighting lamp respectively, not only can the scissors function or the lighting function be started only according to the needs, avoiding the problem of wasting electricity due to the unified control of the two, and still turning on the lighting function during the day when lighting is not required, but also the control system can control the electric scissors to be in a standby state or a safe state by controlling the switching sequence of the shear switch button and the lighting button. This allows the user to easily turn on the machine and lock the body in the standby state. At this time, when the shear switch button or the lighting button is clicked once, the motor and the LED lighting lamp do not work, which can effectively prevent the device from being accidentally turned on by children and causing damage, achieving the purpose of effectively preventing misoperation. Coupled with the side-by-side arrangement of the shear switch button and the lighting button from large to small and from high to low in space, the use of the safe locking state of the device is more convenient and fast, and the practicability is strong.

[0033] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0034] Example 1:

[0035] As Figures 1-3 shown, this embodiment provides a handheld electric scissors with a built-in safety lock function, including a handheld housing 1, a moving blade 2, a static blade 3, a motor 4, an LED lighting lamp 5, a power supply 6 and a control system. The static blade 3 is fixedly installed at the lower front end of the handheld housing 1. The moving blade 2 is provided with a plurality of lightweight holes 7. The handle of the moving blade 2 is connected to the output end of the motor 4 through a swing rod mechanism. The motor 4 can drive the moving blade 2 to swing up and down, so that the moving blade 2 and the static blade 3 are repeatedly opened and closed to realize the shearing function. The motor 4 and the power supply 6 are both arranged inside the handheld housing 1. The LED lighting lamp 5 is arranged above the front end of the handheld housing 1. The LED lighting lamp 5 and the motor 4 are both electrically connected to the power supply 6. The outer surface of the handheld housing 1 is provided with a shear switch button 9 and a lighting button 10 that are respectively electrically connected to the motor 4 and the LED lighting lamp 5. The shear switch button 9 and the lighting button 10 are respectively signal-connected to the control system. The control system can control and process the switching sequence of the shear switch button 9 and the lighting button 10. When the handheld electric scissors are in the standby state, if the time for single-pressing the shear switch button 9 or the lighting button 10 exceeds t 阈值1 , the scissors enter the low-power lock state. When the shear switch button 9 and the lighting button 10 are pressed simultaneously for a time exceeding t 阈值2, the scissors exit the low-power locked state and enter the standby state. When the self-locking handheld electric scissors are in the standby static state for more than t 阈值3 , the scissors enter the low-power locked state. When both the LED lighting lamp 5 and the motor 4 are in the low-power locked state, the self-locking handheld electric scissors are in the safe mode.

[0036] In this specific embodiment, on the basis of ensuring the shearing strength of the moving blade 2, the lightweight holes 7 are provided. The number and aperture size of the lightweight holes 7 are set according to the actual situation. The setting method of the lightweight holes 7 is an existing technology and will not be elaborated here. Through a series of lightweight holes 7, the moving blade 2 is a hollow structure, thus greatly reducing the weight of the moving blade 2. Since the vibration of the whole device mainly comes from the reciprocating motion of the moving blade 2, the impulse M of the reciprocating vibration of the moving blade 2 during operation can be reduced 动刀片 ×V 动刀片 , which can fundamentally greatly reduce the vibration of the whole machine, reduce the vibration feeling of holding and the noise caused by vibration.

[0037] At the same time, for noise reduction and vibration reduction, this embodiment also additionally provides a sound-absorbing cotton 24 and a wear-resistant and temperature-resistant composite layer 25. As Figure 2 shown, sound-absorbing cotton 24 is filled at the joints of each component in the swing rod mechanism, at the joint between the swing rod mechanism and the eccentric shaft 14, and at the joint between the moving blade 2 and the swing rod mechanism. For example, sound-absorbing cotton 24 is filled at the joints or contact parts where there is mechanical interaction, collision, and noise emission, such as between the motor 4 and the eccentric shaft 14, between the reciprocating vibration rod 13 and the handle of the moving blade 2, etc., to absorb the vibration sound of the component collision, thereby reducing the noise emission. As Figure 2 shown, a wear-resistant and temperature-resistant composite layer is coated on the contact part between the moving blade 2 and the reciprocating vibration rod 13, preferably the wear-resistant and temperature-resistant composite layer 25, to ensure lubrication of the friction part between the two, reduce the friction force, and further reduce the vibration noise.

[0038] In this embodiment, as Figures 2-3 shown, the motor 4 is connected to the swing rod mechanism through a planetary reduction gear 11. Among them, the input end of the planetary reduction gear 11 is connected to the output shaft of the motor 4 in a conventional manner, and the output end is connected to the eccentric shaft 14 and the swing rod slider 17 in a conventional manner, which has the function of reducing the speed and increasing the torque of the power output by the motor 4, reducing the rotation speed, reducing the vibration feeling during the operation of the fuselage, and being beneficial to improving the operation stability of the fuselage. In this embodiment, the planetary reduction gear 11 is an existing reduction mechanism, and the reduction ratio can be preferably 4:1.

[0039] In this embodiment, as Figure 3As shown in the figure, the swing rod mechanism includes a cutter rotating shaft 12, a reciprocating vibration rod 13, and an eccentric shaft 14. The cutter rotating shaft 12 is arranged at the front end of the handheld housing 1. The handle part of the moving blade 2 is provided with a cutter rotating shaft hole 2-1. The moving blade 2 is sleeved on the cutter rotating shaft 12 through the cutter rotating shaft hole 2-1, and thus a rotation fulcrum of the moving blade 2 is formed. The upper end and the lower end of the reciprocating vibration rod 13 are respectively provided with an upper swing rod sleeve 15 and a lower swing rod sleeve 16. A swing rod slider 17 and a sliding track adapted to the swing rod slider 17 are arranged inside the reciprocating vibration rod 13. The end of the handle of the moving blade 2 is connected to the front end of the swing rod slider 17. The output end of the planetary reduction gear 11 passes through the eccentric shaft 14 and is connected to the rear end of the swing rod slider 17. The planetary reduction gear 11 transmits the power of the motor 4 to the moving blade 2 through the above swing rod mechanism, and drives the moving blade 2 to swing up and down reciprocally under the action of the swing rod mechanism, and cooperates with the static blade 3 to realize the shearing function. Among them, the above swing rod mechanism and the eccentric shaft 14 and other structures are all commonly used linkage mechanisms in the field of electric scissors. Their main function is to convert the output rotation of the motor 4 into the up and down reciprocating swing of the moving blade 2. The specific structural composition and working principle will not be elaborated here.

[0040] In this embodiment, as Figures 2-3 shown, a motor centrifugal fan 18 is arranged at the rear end of the motor 4. An engine compartment isolation plate 19 is arranged outside the motor 4. The outer periphery of the engine compartment isolation plate 19 is fixed to the inner wall of the handheld housing 1. The engine compartment isolation plate 19 is used to completely isolate the motor air inlet 20 and the motor air outlet 21, and thus the motor cavity is clearly divided into two areas. By using the motor centrifugal fan 18 at the rear end of the motor 4, a (rear) positive pressure area and a (front) negative pressure area are naturally formed, so as to promote the forced circulation convection of the air inside the motor cavity and the air outside the cavity. In this embodiment, as Figure 2 shown, an engine compartment air inlet 22 and an engine compartment air outlet 23 corresponding to the position areas of the motor air inlet 20 and the motor air outlet 21 are respectively arranged on the side wall of the handheld housing 1. The process of the internal and external air circulation is as follows: air inside the motor > air in the rear cavity positive pressure area > air outside the cavity > air in the front cavity negative pressure area > air inside the motor >..., that is, the air in the rear cavity positive pressure area can be discharged through the motor air outlet 21 and the engine compartment air outlet 23 in sequence, and the external air enters the front cavity negative pressure area through the engine compartment air inlet 22 and the motor air inlet 20 in sequence, thereby forming the internal and external air circulation, avoiding the internal cavity circulation of the air, and achieving an excellent heat dissipation effect. The above air outside the cavity refers to the air outside the handheld housing 1. The rear cavity positive pressure area refers to the cavity behind the engine compartment isolation plate 19, and the front cavity negative pressure area refers to the cavity in front of the engine compartment isolation plate 19. "Front" refers to the side where the moving blade 2 and the static blade 3 are arranged.

[0041] In this embodiment, as Figures 1-4As shown in the figure, the handheld housing 1 includes a first housing 1-1, a second housing 1-2 docked with the first housing 1-1, and a third housing 1-3. The first housing 1-1 and the second housing 1-2 are connected at the bottom by a flip-lock connection. The third housing 1-3 is used to dock in front of the first housing 1-1 and the second housing 1-2. The stationary blade 3 is fixedly installed on the third housing 1-3. On the lower side of the handle part of the handheld housing 1, there are a number of bumps 8 distributed in an array, which not only meet the user's needs such as handle anti-slip and acupoint massage at the same time, but also have the advantage of being convenient for mold manufacturing processes.

[0042] In this embodiment, as Figure 3 shown, the motor 4 is located in the middle of the handheld housing 1, and the power supply 6 is located at the rear of the handheld housing 1. An electronic control board 26 is arranged between the motor 4 and the power supply 6. The shear switch button 9 and the lighting button 10 are installed side by side from front to back on the electronic control board 26 (the "front" refers to the side where the moving blade 2 and the stationary blade 3 are arranged). Both the shear switch button 9 and the lighting button 10 are preferably circular buttons, and the pressing area of the shear switch button 9 is larger than that of the lighting button 10. The height of the shear switch button 9 protruding from the top of the handheld housing 1 is higher than the height of the lighting button 10 protruding from the top of the handheld housing 1. Thus, the shear switch button 9 and the lighting button 10 have a clever distribution in space. Due to the front-high and rear-low spatial arrangement between the shear switch button 9 and the lighting button 10, it can exactly fit the slope of the thumb from top to bottom and from front to back when holding the handheld housing 1, which is convenient to press and is beneficial to improving the comfort of the thumb when operating the scissors.

[0043] In this embodiment, the outer surface of the handheld housing 1 is provided with a red indicator light and a green indicator light respectively connected to the control system by signals. When pressing the shear switch button 9 or the lighting button 10 in the low-power locked state, the red indicator light flashes, that is, when pressed once, the red indicator light continuously flashes. And if the body is unlocked, the green indicator light is always on to indicate that both the motor 4 and the LED lighting lamp 5 have entered the standby state.

[0044] In this embodiment, the control system is preferably a single-chip microcomputer programming system. The following specifically describes the circuit connection relationship between the single-chip microcomputer programming system and the pressing of the shear switch button 9 and the lighting button 10, as well as the working principle of the single-chip microcomputer programming system. Among them, the pressing of the shear switch button 9 corresponds to the switch K1, the lighting button 10 corresponds to the switch K2, and the power supply 6 is a rechargeable lithium battery.

[0045] As Figure 5 shown, in this embodiment, a lithium battery low-voltage protection and over-current protection function are also set. When the lithium battery discharges to the voltage U 下限When this happens, the electronic control system starts the protection program and disconnects the Q1 thyristor, thereby protecting the lithium battery from deep over-discharge. At the same time, the warning LED indicator flashes to remind the controller to charge the lithium battery in time; when due to some reason such as motor short circuit, the discharge current of the lithium battery is too large and exceeds I 上限 When this happens, the electronic control system starts the protection program and disconnects the Q1 thyristor, thereby starting the protection to prevent the lithium battery from discharging with a large current.

[0046] Among them, the above low-voltage protection function is realized by detecting the system voltage at the VCC port of the single-chip microcomputer and comparing it with the reference voltage of the single-chip microcomputer, as Figure 5 shown. The system power supply is connected to the VCC terminal of the single-chip microcomputer. The motor control output P1.5 port of the single-chip microcomputer is connected to the control terminal of the Q1 thyristor through the resistor R5. When the system voltage U 系统 <U 下限 , through the AD conversion of the power supply voltage of the single-chip microcomputer, the control program code drives the jump of the level of the P1.5 port of the single-chip microcomputer to turn off the Q1 thyristor, thereby turning off the motor power supply and realizing low-voltage protection. The above over-current discharge protection function utilizes the detection of the working current I 工作电流 to form the tube voltage drop U DS naturally through the internal resistance R R of the Q1 thyristor, as Figure 5 shown. The AD interface P1.2 of the analog-to-digital conversion of the single-chip microcomputer is connected to the positive terminal of the Q1 thyristor through the resistor R3. U R is the voltage drop between the positive terminal and the ground terminal of the Q1 thyristor during operation, that is, the working tube voltage drop. Because the tube voltage drop U R =I 工作电流 ×R DS , where R DS is the internal resistance of the Q1 thyristor and R is a relatively constant value, so the tube voltage drop U R ∝I 工作电流 . By detecting and collecting the tube voltage drop U R of the Q1 thyristor during the operation of the motor, the size of I 工作电流 can be judged. It is set that when the motor I 工作电流 >I 上限 , the program code drives the single-chip microcomputer to jump to the P1.5 port to control the control level of the Q1 thyristor, thereby cutting off the system operation and starting the system over-current protection function.

[0047] Moreover, when the above two protection functions are started, the corresponding red indicator lights flash for alarm. For the above two protection functions, it is necessary to convert and compare the reference voltage of the single-chip microcomputer, the system voltage, and the AD threshold corresponding to the system voltage. The comparison data is shown in Tables 1 to 3 below. According to needs, any corresponding system protection voltage U 保护 and current protection I 上限 can be selected to protect the corresponding voltage relative to the AD threshold.

[0048] Table 1 - Data comparison table 1 of the system voltage and the reference voltage relative to the AD value

[0049]

[0050] Table 2 - Data comparison table 2 of the system voltage and the reference voltage relative to the AD value

[0051]

[0052] Table 3 - Data comparison table 3 of the system voltage and the reference voltage relative to the AD value

[0053]

[0054] The above single-chip microcomputer electronic control system is as Figure 5 shown. Pressing K1 and K2 will cause the port levels of P3.3 and P3.6 of the single-chip microcomputer to jump (such as from high level to low level). Through single-chip microcomputer code programming and setting, the conversion between the safety locking state and the working standby state of the scissors is realized. The principle of realizing this function is the existing technology in the field of single-chip microcomputer programming and will not be elaborated here.

[0055] The working process of the single-chip microcomputer programming system is as Figure 6 shown. After being powered on, the hand-held electric scissors with a built-in safety lock function enter device initialization. After the red indicator light and the green indicator light flash once respectively and then go out, at this time, both the motor 4 and the led lighting lamp 5 are in the off state. Then the scissors enter the low-power locking state. In this state, only a micro-current passes through the single-chip microcomputer to prevent excessive consumption of the lithium battery power during the long-term static state.

[0056] If it is necessary to start the scissors, press K1 and K2 simultaneously. If the pressing time > T, the locking is released. At this time, both the motor 4 and the led lighting lamp 5 have entered the standby state, and the green indicator light is on constantly; if the pressing time < T, the red indicator light flashes, indicating that the scissors are still in the low-power locking state. At this time, click the pressing shear switch button 9 or the lighting button 10, and both the motor 4 and the led lighting lamp 5 do not work.

[0057] As Figure 6 shown, when the scissors are in the standby state, it mainly includes the following three situations:

[0058] (1) Operation of the scissors switch K1:

[0059] Press K1, and the pressing time is T1:

[0060] ① If K1 is long-pressed and within the time T1, the closing time of K1 > t1, then at this time the motor 4 enters the manual operation state, and the cutting and breaking requirements of the scissors can be met by continuously long-pressing K1 with the finger or intermittently pressing K1.

[0061] ② If K1 is double-clicked and within time T1, the on-off interval time of K1 > t2, then the motor 4 enters the automatic operation state at this time. At this time, the moving blade 2 is in a continuous swinging state. People only need to control the cutting direction and do not need to press K1; during the automatic operation of the motor 4, if K1 is single-clicked, then the motor 4 stops running and enters the standby state.

[0062] (2) Operation of the lighting switch K2:

[0063] Press K2, and the pressing time is T2:

[0064] ① If K2 is single-clicked and the single-click time T2 < t3, then the led lighting lamp 5 lights up. If K2 is single-clicked again and the single-click time T2 < t2, then the led lighting lamp 5 goes out. If K2 is single-clicked again and the single-click time T2 < t3, the led lighting lamp 5 lights up... That is, the led lighting lamp 5 lights up when clicked once and goes out when clicked again, and so on in a cycle.

[0065] ② In any case, if K2 is long-pressed and the pressing time T2 of K2 > t4, then both the led lighting lamp and the motor 4 stop working, and the scissors enter the locked state.

[0066] (3) After the scissors enter the standby state, neither K1 nor K2 is operated. When the static time reaches T3, the scissors also enter the locked state.

[0067] The above t1, t2, t3, t4, T1, T2, and T3 can all be adaptively set according to the actual situation.

[0068] It can be seen that the structure of the handheld electric scissors with a built-in safety lock function provided by the present invention is reasonably designed. The control system can control the electric scissors to the standby state or the safe state by controlling the on-off timings of the cutting switch button and the lighting button. It not only enables the user to conveniently turn on the machine but also conveniently locks the machine body in the standby state; when the cutting switch button or the lighting button is single-clicked in the locked state, neither the motor nor the led lighting lamp works, which can effectively prevent the device from being accidentally turned on by children and causing injuries, achieving the purpose of effectively preventing misoperations. Coupled with the side-by-side arrangement of the cutting switch button and the lighting button that gradually decreases in size and height in space, the use of the safe locking state of this device is more convenient and fast, and has strong practicability.

[0069] By setting the cutting switch button and the lighting button to control the motor and the led lighting lamp respectively, not only can the scissors function or the lighting function be started only according to the needs, but also the problem of wasting electricity caused by the two being uniformly controlled and the lighting function still being turned on during the day when lighting is not required can be avoided.

[0070] Hollowing out the moving blade can reduce its weight, thereby reducing the momentum of the reciprocating vibration of the moving blade during operation, fundamentally reducing the vibration of the whole machine, and reducing the vibration sensation during holding and the noise caused by vibration.

[0071] In addition, the present invention is also provided with a cabin isolation plate to completely isolate the motor air inlet and the motor air outlet, dividing the motor cavity into two regions. By using the centrifugal fan at the rear end of the motor, a positive pressure region is naturally formed at the rear and a negative pressure region is formed at the front, promoting the forced circulation convection of the air inside and outside the motor cavity and avoiding the internal circulation of the air in the cavity, which has the effect of good motor heat dissipation; by controlling the materials of the contact parts between the tool handle and the swing rod, which are the key moving parts, the movement damping and noise can be reduced, which is beneficial to improving the electromechanical efficiency of the electric scissors.

[0072] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0073] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation manners and application scopes according to the idea of the present invention. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A hand-held electric scissor with a built-in safety lock function, characterized in that: It includes a handheld housing, a moving blade, a stationary blade, a motor, an LED lighting lamp, a power source and a control system. The stationary blade is fixedly installed at the front end of the handheld housing. The moving blade is provided with a number of lightweight holes. The handle of the moving blade is connected to a swing rod mechanism. The output end of the motor is connected to the swing rod mechanism through a planetary reduction gear. The motor can drive the moving blade to swing up and down. The swing rod mechanism includes a knife rotation shaft, a reciprocating vibration rod and an eccentric shaft. The knife rotation shaft is arranged at the front end of the handheld housing. The handle of the moving blade passes through the knife rotation shaft. An upper swing rod sleeve and a lower swing rod sleeve are respectively installed at the upper end and the lower end of the reciprocating vibration rod. A swing rod slider is installed inside the reciprocating vibration rod. The end of the handle is connected to the front end of the swing rod slider. The output end of the planetary reduction gear passes through the eccentric shaft and is connected to the rear end of the swing rod slider. The motor and the power source are both arranged inside the handheld housing. The LED lighting lamp is arranged at the front end of the handheld housing. The LED lighting lamp and the motor are both electrically connected to the power source. A shearing switch button and a lighting button, which are respectively electrically connected to the motor and the LED lighting lamp, are arranged on the outer surface of the handheld housing. The shearing switch button and the lighting button are respectively in signal connection with the control system. When the handheld electric scissors are in the standby state, pressing the lighting button alone for a time exceeding t 阈值1 , the scissors enter the low-power locked state. Pressing the shearing switch button and the lighting button simultaneously for a time exceeding t 阈值2 , the scissors exit the low-power locked state and enter the standby state; When the standby static time of the hand-held electric scissors exceeds t 阈值3 , the scissors enter the low-power locked state; When the shear switch button or the lighting button is clicked in the locked state, neither the LED lighting lamp nor the motor works; The outer surface of the handheld housing is provided with a red indicator light and a green indicator light that are respectively signal-connected to the control system. When the shear switch button or the lighting button is pressed in the low-power locked state, the red indicator light flashes. In the standby state, the green indicator light is constantly on; the power supply is a lithium battery power supply, and an electronic control system with low-voltage protection and over-current protection functions is arranged on the lithium battery power supply. When the lithium battery discharges to voltage U 下限 , the electronic control system starts a protection program to prevent the lithium battery from being deeply over-discharged; when the discharge current of the lithium battery exceeds I 上限 , the electronic control system starts a protection program to prevent the lithium battery from being over-current discharged; A motor centrifugal fan is provided at the rear end of the motor, and a cabin isolation plate is provided outside the motor. The cabin isolation plate is used to completely isolate the air inlet and the air outlet of the space outside the motor; a cabin air inlet and a cabin air outlet corresponding to the position areas of the motor air inlet and the motor air outlet are respectively provided on the side wall of the handheld housing.

2. The hand-held electric scissors with a built-in safety lock function according to claim 1, characterized in that: Sound-absorbing cotton is filled at the joints of the components in the swing rod mechanism, at the joint of the swing rod mechanism and the eccentric shaft, and at the joint of the moving blade and the swing rod mechanism.

3. The hand-held electric scissors with a built-in safety lock function according to claim 1, characterized in that: A wear-resistant and temperature-resistant composite layer is coated on the contact part between the moving blade and the reciprocating vibrating rod.

4. The hand-held electric scissors with a built-in safety lock function according to claim 1, characterized in that: The handheld housing includes a first housing, a second housing, and a third housing. The first housing and the second housing are docked by a flip cover. The third housing is buckled in front of the first housing and the second housing. Both the static blade and the moving blade are installed on the third housing; a number of convex points are provided on both sides and the lower side of the handle part of the handheld housing in an array.

5. The hand-held electric scissors with a built-in safety lock function according to claim 1, characterized in that: The motor is located in the middle of the handheld housing, the power supply is located at the rear of the handheld housing, an electronic control board is provided between the motor and the power supply, the shear switch button and the lighting button are installed side by side from front to back on the electronic control board, and the pressing area of the shear switch button is larger than the pressing area of the lighting button; both the shear switch button and the lighting button are located directly above the handheld housing, and the height at which the shear switch button protrudes from the top of the handheld housing is higher than the height at which the lighting button protrudes from the top of the handheld housing.

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