CN101941192B - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN101941192B CN101941192B CN2009101403314A CN200910140331A CN101941192B CN 101941192 B CN101941192 B CN 101941192B CN 2009101403314 A CN2009101403314 A CN 2009101403314A CN 200910140331 A CN200910140331 A CN 200910140331A CN 101941192 B CN101941192 B CN 101941192B
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Abstract
The invention relates to an electric tool which comprises a casing, a motor, a power source, a working head, a control assembly and a control indicating device, wherein the motor is contained in the casing; the power source provides current for the motor; the working head is driven by the motor to rotate; the control assembly is positioned in the casing and automatically lowers the rotation speed of the motor according to the state change of the working head; the control indicating device is arranged on the casing and is electrically connected with the control assembly; and the control indicating device comprises an executive component capable of enabling the control assembly to be at least in an active first position and an inactive second position. Compared with the prior art, the invention enables an operator to definitely know the running state of the torsion control device of the electric tool to avoid the motor overload, thereby prolonging the service life of the motor and enabling the operation to be simple and convenient.
Description
Technical field
The present invention relates to a kind of electric tool, relate in particular to a kind of electric tool with automatic torsion control function.
Background technology
The prior electric instrument like electric screw driver, provides electric current through the power supply that loads, and comes drive motors to rotate, thereby makes the working head rotation so that screw is crept in the plank.Dissimilar screws has the different main body diameter, perhaps has different nose shapes, and so, its situation of creeping in the same plank also has nothing in common with each other.In addition, different planks is because the material difference makes its hardness also different, and so, the situation that same screw creeps in the plank of unlike material also is not quite similar.Usually in the use of electric screw driver, the user need be drilled into the surface that head is pressed close to workpiece with screw, and so, the user needs extreme care ground to pay close attention to drilling process, controls the motor stall when pressing close to workpiece surperficial when the head of screw.Thereby, on the one hand avoid screw head to be pierced plank inside too far, avoid screw head to be crept into plank because of carelessness on the other hand after, owing to suffering excessive resistance to make motor overload.
Common this electric tool can be provided with overload protection arrangement, such as a kind of mechanical clutch, under the situation of current overload, the working head of electric tool is cooperated with the motor disengaging.Adopt the electric tool of this overload protection arrangement can be provided with a torsion cover, i.e. a rotatable cover that indicates the limit torsion gear scale of some expression electric tools work simultaneously in the front portion of its casing usually.When the moment of torsion of exporting in the electric tool work met or exceeded predefined threshold values, clutch system can be started working automatically and made the working head of electric tool and motor break away from cooperation.The user can set the limit torque value of electric tool work in advance through the rotary torsion cover.But, in fact the user not know that also what kind of gear is set on earth in advance proper, thereby exist still top problem can appear.
Also a kind of electric clutch can be set, detect current of electric or moment of torsion, when the operating current of electric tool reaches certain predefined current value, send signal, reduce rotating speed of motor or make the motor stall by microprocessor through microprocessor.When using electric clutch,, need electric clutch to quit work if carry out punch operation as overload protection arrangement.But whether the electric clutch of the understanding electric tool that the operator can't be clear and definite can work, thereby, brought puzzlement to punch operation.
Summary of the invention
The present invention provides a kind of electric tool that can marking tools torsion state of a control.
For realizing above-mentioned purpose; Technical scheme of the present invention is: electric tool; Comprise: casing; Be contained in the motor in the casing, for motor provides the power supply of electric current, by the working head of motor-driven rotation; Be positioned at casing and reduce the Control Component of motor speed automatically and be arranged on the control indicating device that is electrically connected with Control Component on the casing according to the state variation of working head, the control indicating device comprises the executive component that makes Control Component be in the acting primary importance and the inoperative second place of Control Component at least.Described control indicating device comprises that also the indication executive component is in the display unit of the primary importance and the second place.
Compared with prior art; The present invention is through setting up the moment of torsion that relevant Electronic Control Unit comes automatic control tool in electric tool; And represent concrete control model through display unit, make the running status of the clear and definite torque controlling device of knowing electric tool of operator, avoid the generation of motor overload; Both prolonged the life-span of motor, made simple to operation again.
Preferably, described display unit comprises at least one the LED lamp that is electrically connected with said executive component.Described display unit comprises two LED lamps.When described Control Component was in primary importance, one in the said LED lamp was opened.When described Control Component was in the second place, another in the described LED lamp was opened.
Described executive component can make Control Component be in acting the 3rd position.
Preferably, described executive component is a button.
Said electric tool also comprises the switch that is electrically connected with motor and power supply respectively, and preferred, said switch is a speed-regulating switch.When said switch was pulled, at least one in the said LED lamp was opened; When said switch is disconnected, instantaneous being closed of described LED lamp.
Described electric tool and said power supply momentary connection, described LED lamp is opened and keeps a period of time.Described executive component can not the residing position of conversion and control assembly when motor rotation.
Preferably; Described Control Component comprises the sensor of measuring said current of electric, detects to be positioned at that electric current is asked the pulse signal on the curve of second dervative or higher derivative to the time and the control signal that generates thus reduces the electronic-controlled installation of said motor speed.Described Control Component comprises microprocessor.Described Control Component asks the value of first derivative and second dervative to carry out product with electric current to the time; And be the preset threshold values of this product value, when the product of said first derivative and second dervative on the occasion of and numerical value during more than or equal to threshold values the generation control signal corresponding reduce the speed or the shutdown of motor.
Said Control Component comprises memory storage, the residing position of Control Component during the shutdown of said memory storage storage electric tool, and corresponding signal passed to the control indicating device.Said display unit shows the residing position of the Control Component of storing in the said memory storage when motor and power connection.
Said electric tool comprises a speed-regulating switch, and when said speed-regulating switch was in primary importance, said display unit showed the position of said Control Component, and when said speed-regulating switch was in the second place, said executive component was inoperative to said Control Component.
Preferably, described electric tool is a D.C. electric drill, and described power supply is the lithium battery bag.
Preferably, described control indicating device is arranged on the position of contiguous power supply on the casing.Can be arranged on same position with the electric quantity display device of power brick, a shared display screen, the handled easily person observes.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is the schematic perspective view of electric tool of the present invention.
Fig. 2 is the sketch map of first embodiment of the control indicating device of electric tool of the present invention.
Fig. 3 a is the sketch map of second embodiment of the control indicating device of electric tool of the present invention.
Fig. 3 b is the sketch map of the 3rd embodiment of the control indicating device of electric tool of the present invention.
Fig. 3 c is the sketch map of the 4th embodiment of the control indicating device of electric tool of the present invention.
Fig. 3 d is the sketch map of the 5th embodiment of the control indicating device of electric tool of the present invention.
Fig. 4 is a kind of operation principle block diagram of the Control Component of electric tool of the present invention.
Fig. 5 is the another kind of operation principle block diagram of the Control Component of electric tool of the present invention.
Fig. 6 is the another kind of operation principle block diagram of the Control Component of electric tool of the present invention.
Fig. 7 is the control circuit block diagram of electric tool of the present invention.
Wherein,
Electric screw driver 2 casings 4 motors 6
Working head 8 chucks 10 clutch systems 12
Screw 14 planks 16 power supplys 18
Switch 20 Control Components 22 sensors 24
26 second differentiate unit, the first differentiate unit, 28 electronic control circuits 30
Be stored in processing unit 32 the 3rd differentiate unit 34 electronic-controlled installations 42
The specific embodiment
In this embodiment, power supply 18 is dc sources, or rechargeable battery, can when switch 20 closures, supply with motor 6 direct currents.Preferably, power supply 18 is lithium battery bags.Certainly, those of ordinary skill in the art also can expect easily, adopts AC power to substitute the dc source in this embodiment.
Among the present invention, Control Component 22 comprises the sensor 24 of measuring motor 6 electric currents, and detection is positioned at electric current and is asked the pulse signal on the curve of second dervative or higher derivative the time and generate the electronic-controlled installation 42 that control signal reduces motor 6 rotating speeds thus.Preferably, Control Component 22 comprises microprocessor.In this embodiment, electric tool is the electric screw driver of direct current, and power supply 18 is the lithium battery bag.
Specific embodiment referring to the control indicating device 50 shown in the accompanying drawing 2-3d.Among first embodiment of the control indicating device shown in Fig. 2, executive component 52a is a toggle of being located at casing 4 tops, and it is electrically connected with Control Component 22.Executive component 52a can move along the direction of casing 4 longitudinal extensions, thereby switching controls assembly 22 is in the acting primary importance (ON) and the inoperative second place (OFF).Certainly, executive component 52 can also be a knob, rotates around the axis that is fixedly installed on the casing 4, can make Control Component 22 be in above-mentioned at least two positions equally.
Among the embodiment shown in Fig. 3 a-3d, executive component 52b is a button, can be in different states of activation by operator presses.Preferably, display unit 54 is arranged on the same control panel with executive component 52b.Certainly, those skilled in the art also can be easy to expect, executive component 52 is arranged on the position of operator's easy operating on the casing 4, and display unit 54 are arranged on the different positions, observe and see but be beneficial to the operator.Such as, establish button on the casing of adjacent tools operating grip, and display unit is contained in the housing part of adjacent DC power supply.Even can consider the display unit of display unit 54 and the electric weight that shows power brick is located at same position.
With reference to the embodiment shown in the figure 3a, display unit 54 comprises two LED lamps.The combination of closing and opening of LED lamp is corresponding to three kinds of states of Control Component 22.LED lamp L1 opens, and L2 closes, and expression Control Component 22 is in the torsion of twisting big screw on the relatively hard materials and regulates pattern, and at this moment, Control Component 22 is in first acting position.L1 closes, and L2 opens, and expression Control Component 22 is in than the torsion of twisting Screw on the soft material and regulates pattern, and at this moment, Control Component 22 is in second acting position.L1 and L2 close simultaneously, and expression Control Component 22 is in inoperative position, and at this moment, electric screw driver 2 is not carried out the work of twisting screw 14, only can be used for punching.Corresponding to this embodiment, can corresponding mark H (Hard hardwood head) and S (Soft cork head) as the LED lamp of display unit next door, so that the operator distinguishes the different working pattern.
Perhaps remain two top LED lamps.L1 opens, and L2 closes, and the expression Control Component is in acting position, and L1 closes, and L2 opens, and the expression Control Component is in inoperative position.Corresponding to this embodiment, can corresponding mark ON and OFF as the LED lamp of display unit next door, so that confirming Control Component, the operator whether is in acting position.
Among the embodiment shown in Fig. 3 b, the LED lamp has only one, and the opening and closing of L3 are corresponding to the Kai Heguan of Control Component 22.That is to say that when L3 opened, electric screw driver 2 can be used for twisting screw, Control Component is in acting primary importance, and L3 is when closing, and Control Component is in the inoperative second place, and electric screw driver only is used for punching.
Among the embodiment shown in Fig. 3 c, the LED lamp has two at least.L4 is a green light, and L5 is a red light.When executive component 52b made Control Component 22 be in acting position, L4 opened.When executive component 52b made Control Component 22 be in inoperative position, L5 opened.Electric screw driver 2 is under the situation of not starting shooting, and L4 and L5 all are in closed condition.In case electric screw driver 2 starts, similar with the embodiment among Fig. 3 a, L4 and L5 have one at least and are in open mode, so that the duty of indication Control Component 22.If Control Component 22 can be in two acting positions, correspondingly, the LED lamp can have three, and L6 is an amber light.In this embodiment, the L4 lamp is opened, and L5 and L6 close, and regulates pattern corresponding to the torsion of on harder material, twisting big screw, and at this moment, Control Component 22 is in an acting position.The L6 lamp is opened, and L4 and L5 close, and regulates pattern corresponding to the torsion of on softer material, twisting Screw, and at this moment, Control Component 22 is in acting another position.And L5 opens, and L4 and L6 close, and regulates the pattern closing state corresponding to automatic torsion, and promptly Control Component 22 is in inoperative position.
The residing mode of operation of the instrument of operator's identification for ease; On control panel; Each LED lamp can be distinguished corresponding mark H; S and OFF, the mode of operation (Hard) on the expression relatively hard materials is than mode of operation on the soft material (Soft) and the inoperative mode of operation of Control Component (OFF).
Shown in accompanying drawing 3d, control indicating device 50 can comprise a LCD display as display unit, and different torsion adjusting positions directly shows by concrete literal is corresponding.Such as, torsion adjusting pattern is opened with automatic torsion adjusting pattern and is closed automatically.Also can on display screen, fixedly install the icon of a big screw and a Screw; Corresponding respectively indication Control Component 22 is in the mode of operation (Hard) of working on the relatively hard materials or playing big screw, the mode of operation (Soft) of working or beating Screw on than soft material.The electric weight that can also show power brick on the display screen simultaneously shown in figure, adopts several grids that increase step by step to represent what of electric weight.When the power brick electric weight was sufficient, all seven grids were all bright, when the power brick electric weight is not enough, only had a grid bright.Other state is by what of the corresponding electric weight of the quantity of grid.Certainly, those skilled in the art can also be easy to expect other display unit, such as, multidigit nixie tube etc., the applicant does not give unnecessary details at this.
Referring to accompanying drawing 4, the Control Component 22 that reduces motor speed according to the state variation of working head automatically comprises electronic-controlled installation 42 and the sensor 24 that is used to detect electric current, is connected between power supply 18 and the motor 6.The state variation of working head is meant whether working head has run in rotary course that head of screw abuts to surface of the work and situation that load is increased rapidly.Under the normal condition, screw is screwed into wood by working head, and the load that working head bore is more stably, and the electric current of corresponding motor is also more stable.When head of screw arrives to surface of the work, the instantaneous increase of load meeting of working head, at this moment, therefore Control Component 22 detection-sensitive motor electric currents also adjust rotating speed of motor, such as cutting off current of electric, motor speed are reduced, until shutdown.In this embodiment, electric screw driver 2 also comprises the first differentiate unit 26 and the second differentiate unit 28.Sensor 24 can detect the current i of supplying with motor 6 in real time, generates with the proportional signal of detected electric current simultaneously and passes to the first differentiate unit 26; Then first derivative di/dt is tried to achieve according to electric current and time in the first differentiate unit 26, generates one simultaneously with the proportional signal of this first derivative and further pass to the second differentiate unit 28; Subsequently, second dervative is tried to achieve in the second differentiate unit 28, and when pre-conditioned generation, when peak signal p be on the occasion of and numerical value on during greater than preset threshold values v, generate control signal s.In this embodiment, this control signal s is used to reduce the rotating speed of motor 6 or interrupts to motor 6 electric power being provided.That is to say that control signal s is used to the current i of supplying with motor 6 is reduced to a lower level or reduces to zero, thereby reduces the rotating speed of motor 6 or make the motor stall.Certainly, this control signal s also can be used to change the flow direction of current i, thereby motor 6 can be stopped rapidly.In this embodiment; Control signal s can be passed to electronic-controlled installation 42; Then carry out corresponding action by electronic-controlled installation 42, these actions can be to produce the instant generation in back at peak signal p, also can be to postpone to produce after a period of time; This delay can realize in electronic-controlled installation 42, also can realize through the delay cell of independent setting.
In preferred embodiment, Control Component 22 can comprise a microprocessor, the first differentiate unit 26, the second differentiate unit 28, or the function that realized such as the delay cell that possibly exist all can carry out through the instruction that is solidificated in the microprocessor.That is to say that The whole control assembly 22 can be a microprocessor.
Whether the work package that the Control Component 22 automatic testings of above-mentioned embodiment through in electric tool, setting up relevant electronics 8 drive has arrived the precalculated position; And after detecting this work package arrival precalculated position, carry out corresponding actions, guarantee it and can further not cross this precalculated position.
With reference to the electric tool 2 shown in the accompanying drawing 5, for example electric screw driver has used above-mentioned embodiment based on second operation principle to carry out work.Wherein, most of elements are identical or close with embodiment shown in Figure 4, so, these elements are used identical label.
The work package 4 of electric screw driver shown in Figure 5 comprises direct current generator 6, is used for driving the working head 8 that is clamped on the hammer 10.Be connected with clutch system 12 through a mechanical type spring between hammer 10 and the motor 6.Working head 8 is used for rotating a screw 14 it is screwed into plank 16.Power supply 18 is dc sources, can be rechargeable battery, can when trigger 20 closures, supply with motor 6 DC current i.
Be connected with electronic-controlled installation 42 and the sensor 24 that is used to detect electric current between power supply 18 and the motor 6.Current sensor 24 can detect the electric current of supplying with motor in real time, generates with the proportional signal of detected electric current simultaneously and passes to differentiate unit 26.Differentiate unit 26 generate subsequently one with electric current to the proportional signal of the first derivative di/dt of time.The output of differentiate unit 26 is connected to the input of a storage and processing unit 32.
Store in storage and the processing unit 32, described in above-mentioned first embodiment, the single threshold values P1 and first and second first derivative values q1 and the q2.At Preset Time point T1, if current i 1 is lower than threshold values P1, storage is selected the first first derivative values q1 with processing unit 32; If current i 2 is higher than threshold values P1, then storage is selected the second first derivative values q2 with processing unit 32.Wherein the second first derivative values q2 is greater than the first first derivative values q1.When the first derivative di/dt reaches the first or second preset first derivative values q1 or q2, storage and processing unit 32 corresponding generation control signal s1 or s2.At this moment, screw head has arrived the surface of plank.Storage passes to electronic-controlled installation 42 with processing unit 32 with control signal s1 or s2.This electronic-controlled installation 42 is used to reduce or break off the electric power of supplying with motor 6.That is to say, control signal s1 or s2 be used to make the current i of supplying with motor be reduced to zero or lower value so that motor stall or rotating speed be substantially zero.In this embodiment, control signal s achieves this end through electronic control circuit 30.Reduction of speed control to motor can produce the instant execution in back at pulse signal p, also can be to delay the specific time to carry out.Control signal s1 or s2 also can be used for changing the flow direction of current i, thereby make the rapid stall of motor.
That shown in Figure 6 is the 3rd embodiment of Control Component 22 of the present invention, three order derivatives of time is reduced the rotating speed of electric tool 2 through having used electric current.
In the specific embodiment, at second dervative d
2I/dt
2The basis on, further obtained the three order derivative ds of electric current to the time
3I/dt
3If detect three order derivative value d
3I/dt
3Greater than the threshold values v1 that provides in advance, and be on the occasion of the time, control signal s has just been generated.Control signal s is used to reduce the rotating speed of electric screw driver 2 subsequently.
Those skilled in the art can know, through detect quadravalence, five rank or more the derivative of high-order realize the generation of control signal s.Because these can infer easily that all the applicant is not giving unnecessary details at this.
The signal that it should be noted that 28 outputs of the second differentiate unit has passed to the 3rd differentiate unit 34, generates three order derivative d then
3I/dt
3Along with the 3rd differentiate unit 34 output signals, a positive pulse value p1 has been transfused to electronic control circuit 30, and it is regarded as control signal s.Through electronic control circuit 30, control signal s makes the DC current i that supplies with motor 6 be reduced or even is disconnected fully.
The first derivative of mentioning in the above-mentioned embodiment, second dervative or more higher derivative be not limited in the derivative definition on the pure mathematics meaning, can also comprise in the practical engineering application and carry out the simple equivalent conversion based on the derivative principle.For example, first derivative also can be expressed as the electric current changes delta i in the continuous time interval Δ t, i.e. Δ i/ Δ t.For making things convenient for practical applications, can Δ t be taken as a very little equivalence, like Δ t=10ms, so, the difference that only needs constantly to judge current i just can realize being equivalent to the computing of asking first derivative.Analogize in view of the above, to second dervative or more the similar equivalent transformation done of higher derivative be included in the implication of derivative among the present invention.
Below will discuss based on second dervative or more higher derivative generate another embodiment of control signal.With the second dervative is example, and electric screw driver can be met some abnormal conditions sometimes and cause operating current that improper sudden change takes place, thereby the second dervative that is obtained is disturbed when work.These abnormal conditions as, in screw is being screwed into the process of plank, run into the knot in the plank and cause electric current to raise suddenly; Perhaps electric current significantly rises suddenly and when also not getting into the stage of stable development, just detects when motor just starts; Perhaps when using the dc-battery bag as power supply, power brick causes voltage to descend rapidly because of crossing to put, and then makes electric current undergo mutation; Perhaps user's arm generation in use shake suddenly, and cause current break.If screw also was not screwed into plank fully when above-mentioned situation took place; The second dervative that time is calculated according at this moment electric current just might produce interference, that is to say, the second dervative that generate this moment possibly also can meet or exceed pre-set threshold value v; And this moment Control Component; Electronic-controlled installation 42 will think by error that screw has been screwed in the plank fully and the electric power of sever supply motor, and this obviously is not to use the person to be unwilling to see.
When running into above-mentioned abnormal conditions; Current value when the current value of this moment is often compared screw and is screwed into plank fully is little; Institute thinks and addresses the above problem; Control Component can carry out product with corresponding current value (serving as basic and the value of corresponding this second dervative that calculates with this current value promptly) with the value of second dervative; And be the preset new threshold values of this product value, when the product of this second dervative and corresponding electric current on the occasion of and numerical value during more than or equal to new threshold values the generation control signal corresponding reduce the speed or the shutdown of motor.Obviously, new threshold values is more much bigger than former threshold values v, in this way, makes actual second dervative of wanting and the gap that produces between the second dervative of disturbing be exaggerated, thereby uses bigger threshold values that the actual second dervative of wanting is screened.Certainly in other embodiments; Can be with the product of electric current or first derivative or a second dervative and a fixed constant; The n power of electric current or first derivative or second dervative, electric current and product, single order or the second dervative of product, second dervative and the corresponding first derivative and the electric current of product, second dervative and the corresponding first derivative of corresponding first derivative add that certain levels off to the cotangent functional value (like ctan (single order or second dervative)) of asking tan value (like tan (89+ single order or second dervative)), single order or second dervative after 90 the value again or be the truth of a matter and numerical value 1 and the difference of single order or second dervative is that the logarithmic function value (like loga (1-single order or second dervative)) of antilog compares with corresponding threshold values with arbitrary value a; When above-mentioned value when numerical value (being absolute value) is gone up more than or equal to its corresponding threshold values (this threshold values is a positive number), generate speed or shutdown that control signal reduces motor.
With reference to accompanying drawing 7, the circuit block diagram of electric tool of the present invention.Wherein, display unit is two LED lamps, and executive component is gauge tap KEY1.After electric tool and power brick connected, power brick was the voltage that MCU provides 5V through VCC, and MCU gets electric, and program running is light with one of them the LED lantern festival in the display unit that control circuit is electrically connected.Control Component 22 comprises memory storage, Control Component 22 residing positions during the shutdown of memory storage storage electric tool, and corresponding signal passed to control indicating device 50.When display unit 54 is connected with power supply 18 at motor 6, show the residing position of Control Component of storing in the memory storage.In the present embodiment, the residing position of Control Component when MCU storage shutdown last time is perhaps cut off the power supply.If Control Component 22 is in the position of working during last the shutdown, then corresponding at this moment L1 lamp is bright; If Control Component 22 is in inoperative position during last the shutdown, then corresponding at this moment L2 lamp is bright.The operator can be as required, makes between Control Component position and the inoperative position in action and switch through pressing executive component KEY1, and corresponding LED lantern festival alternately brightens.
The LED lamp is after light, if the operator does not pull the main switch 20 of electric tool, in order to save the electric weight in the power brick, then after a period of time, such as 10 minutes, MCU can close the LED lamp, and simultaneously, whole system gets into resting state.If the operator pulls main switch 20, motor is rotated, this moment, display unit can keep bright state always.At this time press executive component KEY1 again, can not change the residing state of Control Component.That is to say, when the motor of electric tool is in running status, the state variation pattern of Control Component conversion conductively-closed.That is to say that if electric tool and power brick connect, main switch 20 is closed, and motor 6 is when being driven in rotation, executive component is inoperative.Like this, can prevent that the operator is in use because maloperation and the residing position of conversion and control assembly by force causes that unnecessary operating mode takes place, and is screwed in the wood such as head of screw.
But whether the operator can't work and frequent plug power brick in order to confirm Control Component.Therefore, more common situation should be, power brick and electric tool connect together, but in order to save the electric weight of power brick, display unit is the LED lamp and does not work.Thereby be necessary to design a kind of switch, can make operator's easy affirmation residing state of Control Component and not waste the electric weight of power brick.Thus, the main switch 20 of electric tool can be a kind of speed-regulating switch.When speed-regulating switch was in primary importance, display unit showed the position of Control Component, and when speed-regulating switch was in the second place, executive component was inoperative to Control Component.Whether when the operator pressed gently, display unit LED lamp was instantaneous bright, but motor do not rotate, and the operator is known Control Component residing state when shutting down last time, and then select the position of Control Component to need to change as required.
Also have a kind of situation, power brick is plugged on electric tool, but the electric weight in the power brick is extremely low, is not enough to drive motor rotation, and at this moment, display unit is that the LED lamp does not work yet.No matter whether the operator pulls main switch, and the LED lamp all is in closing state.Can acting state in order to represent that electric tool is in the low but Control Component of power brick electric weight, electric quantity display device can be set separately.LED lamp L7 representes that the power brick electric weight is high, and L8 representes that the power brick electric weight is medium, and L9 representes that the power brick electric weight is low.When the electric weight of power brick was not enough to drive motor rotation, electric weight showed the flicker of L9 lamp, reminded the user to consider to change power brick earlier.
Electric tool has under the situation of power brick electric quantity display device, the display unit of control indicating device 50 can with the shared display floater of electric quantity display device, be arranged on the casing position of adjacent cells bag.
Above-mentioned is that example describes with the electric screw driver, and certainly, the present invention also can be other electric tools, like electric drill, electric wrench etc.Because this application for those of ordinary skill in the art, can realize through above-mentioned embodiment, so the applicant no longer gives unnecessary details at this easily.
Claims (8)
1. electric tool comprises:
Casing,
Be contained in the motor in the casing,
For motor provides the power supply of electric current,
By the working head of motor-driven rotation,
Be positioned at casing and reduce the Control Component of motor speed automatically according to the state variation of working head,
It is characterized in that:
Said electric tool also comprises and is arranged on the control indicating device that is electrically connected with Control Component on the casing; Comprise the executive component that makes Control Component be in the acting primary importance and the inoperative second place of Control Component at least; Described control indicating device comprises that also the indication executive component is in the display unit of the primary importance and the second place, and said Control Component comprises memory storage, the residing position of Control Component when said memory storage storage electric tool shuts down; And corresponding signal passed to the control indicating device; Said electric tool comprises a speed-regulating switch, and when said speed-regulating switch was in primary importance, said display unit showed the position of said Control Component; When said speed-regulating switch was in the second place, said executive component was inoperative to said Control Component.
2. electric tool according to claim 1 is characterized in that: described display unit comprises at least one the LED lamp that is electrically connected with said executive component.
3. electric tool according to claim 2 is characterized in that: described display unit comprises two LED lamps.
4. electric tool according to claim 3 is characterized in that: when described Control Component was in primary importance, one in the said LED lamp was opened.
5. electric tool according to claim 1 is characterized in that: described executive component is a button.
6. electric tool according to claim 1; It is characterized in that: described Control Component comprises the sensor of measuring said current of electric, and detection is positioned at electric current and is asked the pulse signal on the curve of second dervative or higher derivative the time and generate the electronic-controlled installation that control signal reduces said motor speed thus.
7. electric tool according to claim 6 is characterized in that: described Control Component comprises microprocessor.
8. electric tool according to claim 7 is characterized in that: described electric tool is a D.C. electric drill, and described power supply is the lithium battery bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101403314A CN101941192B (en) | 2009-07-10 | 2009-07-10 | Electric tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101403314A CN101941192B (en) | 2009-07-10 | 2009-07-10 | Electric tool |
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| CN101941192A CN101941192A (en) | 2011-01-12 |
| CN101941192B true CN101941192B (en) | 2012-11-21 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013022681A (en) * | 2011-07-21 | 2013-02-04 | Hitachi Koki Co Ltd | Electric tool |
| CN103386665B (en) * | 2012-05-07 | 2015-07-01 | 苏州宝时得电动工具有限公司 | Control method of electric tool and electric tool used for executing control method |
| CN103567942A (en) * | 2012-08-02 | 2014-02-12 | 杨丽娟 | Improved portable electric screwdriver |
| CN104175267B (en) * | 2013-05-20 | 2016-08-03 | 南京德朔实业有限公司 | Electric tool and control method thereof |
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