CN106181900A - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN106181900A CN106181900A CN201510224177.4A CN201510224177A CN106181900A CN 106181900 A CN106181900 A CN 106181900A CN 201510224177 A CN201510224177 A CN 201510224177A CN 106181900 A CN106181900 A CN 106181900A
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- electric tool
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- motor
- output shaft
- control unit
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Abstract
The present invention relates to a kind of electric tool, described electric tool includes: housing, output shaft, arranges in the housing；Motor, drives the rotation of output shaft；Mode selector, by user's trigger output signal, selectively sets electric tool and is in first mode or the second pattern；Control unit, receives the signal of mode selector transmission, controls the work of motor；When electric tool is in first mode, control unit controls motor and rotates continuously, and when electric tool is in the second pattern, control unit controls motor intermittent rotary.The electric tool of the present invention has multiple-working mode so that electric tool is the control of the slow person convenient to operate of rotating speed at the end of work process is fast, and prevents from when work process just starts skidding.
Description
Technical field
The present invention relates to electric tool.
Background technology
Existing electric tool, such as electric tool, provides electric current by the power supply loaded, drives motor to turn
It is dynamic, so that work head rotates to be crept in plank by screw.Generally during the use of electric tool,
User needs that screw is drilled into head and presses close to the surface of workpiece, on the one hand avoids screw head to be bored too far
Enter inside workpiece, after on the other hand avoiding screw head accidentally to be crept into workpiece, destroy the complete of surface of the work
Whole property.
Usual this electric tool can be provided with overload protection arrangement.This overload protection arrangement can be a kind of machine
Tool formula clutch, in the case of above-mentioned current overload, can make the work head of electric tool depart from motor and join
Close.The electric tool using this overload protection arrangement would generally be provided with a torsion simultaneously in the front portion of its casing
Power cover, i.e. one the rotatable cover indicating some scales.These scales represent the pole that electric tool works
Limit torsion gear.The limit of electric tool work can be set beforehand through rotary torsion cover when user uses
Torque value, say, that it is set in advance that the torsional moment exported in electric tool works meets or exceeds this
During ultimate value, clutch system can automatically begin to work and make the work head of electric tool and motor depart from cooperation.
Additionally, using the electric tool of this overload protection arrangement can also be to extend one in the front end of its casing
Sleeve pipe, remains basically stable in the front end of the work head of the front end of this sleeve pipe and electric tool.By this set, when
When its head that screw gets into is attached to the surface of plank, the leading section of sleeve pipe is also attached to the surface of plank, then enters
One step bores dynamic screw, and sleeve pipe can be compressed by plank and make it touch the clutch mechanism in casing, thus
Make work head and motor depart to coordinate.But said structure is the most complicated.On this basis, it is provided that electronics control
Assembly processed, whether detection screw reaches surface of the work automatically, when arriving surface of the work, autostop.But by
In different types of screw, there is different main diameters, or there is different nose shapes, so, its
Creep into the situation in same plank the most different.Additionally, different planks makes it hard due to material difference
Degree is also different, and so, the situation that same screw creeps in the plank of unlike material is also not quite similar.But electronics
The trigger condition of autostop controlling assembly does not the most occur to change too much, causes electric tool or too early
Shut down, or the most just shut down.Therefore, the electric tool with automatic shutdown function can not realize accurately
Screw is driven into surface of the work by ground.
Additionally, existing electric tool is when start, motor i.e. enters rotation continuously, is easily caused smooth
Surface occurs skidding when playing the operation such as screw or boring.
Therefore, it is badly in need of a kind of simple in construction, but energy person convenient to operate accurately controls the end position of its work
Electric tool, and this electric tool can be prevented effectively from skidding.
Summary of the invention
The present invention provides a kind of electric tool, and it has multiple-working mode, is easy in one mode of operation
Operator's control to electric tool, is avoided that skidding in another operation mode.
For achieving the above object, the technical scheme is that a kind of electric tool, described electric tool bag
Include: housing, output shaft, arrange in the housing；Motor, drives the rotation of output shaft；Mode selector,
By user's trigger output signal, selectively set electric tool and be in first mode or the second pattern；Control
Unit, receives the signal of mode selector transmission, controls the work of motor；When electric tool is in first
During pattern, control unit controls motor and rotates continuously, when electric tool is in the second pattern, and control unit
Control motor intermittent rotary.
Preferably, described electric tool also includes that detection characterizes the detector unit of the parameter of output shaft load, control
The signal that unit processed transmits according to mode selector and detector unit, controls the work of motor；Electric tool
When being in first mode, control unit receives the signal of detector unit transmission, when the ginseng characterizing output shaft load
When number meets pre-conditioned, control electric tool and enter the second pattern.
Preferably, described electric tool also includes that detection characterizes the detector unit of the parameter of output shaft load, control
The signal that unit processed transmits according to mode selector and detector unit, controls the work of motor；Electric tool
When being in first mode, control unit receives the signal of detector unit transmission, when the ginseng characterizing output shaft load
When number meets pre-conditioned, control motor and stop operating.
Preferably, the described pre-conditioned parameter for characterizing output shaft load reaches setting value.
Preferably, the change of the described pre-conditioned parameter for characterizing output shaft load reaches setting value.
Preferably, the described pre-conditioned function for the second dervative of the parameter characterizing output shaft load reaches to set
Definite value.
Preferably, the second dervative of the described pre-conditioned parameter for characterizing output shaft load reaches setting value.
Preferably, described mode selector includes that first mode selects device and the second mode selector,
When first mode selects device to be triggered, set electric tool and be in first mode, when the second model selection
When device is triggered, sets electric tool and be in the second pattern.
Preferably, described first mode selects device be arranged on cabinet top and can be lit, the second pattern choosing
Selecting device selects device be arranged on cabinet top side by side and can be lit with first mode, when first mode selects
Selecting device or time the second mode selector is triggered, control unit controls first mode and selects device or second
Mode selector is lit.
Preferably, the parameter of described sign output shaft load is to flow through the electric current of motor.
Compared with prior art, the electric tool of the present invention has various selectable mode of operation, first
Under pattern, at the end of work process is fast, the velocity of rotation of motor reduces, it is simple to operator is to electric tool
Control；Under the second mode, motor does not haves rotation continuously, and intermittent rotary directly occurs so that
Electric tool can be prevented effectively from skidding.
Accompanying drawing explanation
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the front view of the electric tool of better embodiment.
Fig. 2 is the top view of electric tool in Fig. 1.
Fig. 3 is the circuit block diagram of electric tool in Fig. 2.
Fig. 4 is the workflow diagram of the first better embodiment of electric tool in Fig. 1.
Fig. 5 is the workflow diagram of the second better embodiment of electric tool in Fig. 1.
10 electric tool 25 mode selectors
12 wiring board 251 first modes select device
14 housing 253 second mode selectors
16 motor 26 control units
18 power supply 30 detector units
22 output shaft 32 electrical switches
24 trigger 34 voltage modules
Detailed description of the invention
Detailed description for the present invention and technology contents, coordinate accompanying drawing to be described as follows, and appended accompanying drawing only carries
For reference with explanation, not it is used for the present invention is any limitation as.
Electric tool 10 as shown in Figure 1 includes housing 14, the output shaft 22 being arranged in housing 14,
The motor 16 driving output shaft 22 to rotate, provides the power supply 18 of energy, and is arranged on electricity for motor 16
Wiring board 12 between source 18 and motor 16.Electric tool 10 also includes being arranged on pulling on housing 14
Machine switch 24 and the mode selector 25 being arranged on housing 14 top.Trigger 24 has triggering
State and non-toggle state.Under non-toggle state, the energy transmission of power supply 18 to motor 16 is prohibited,
Motor 16 keeps the state stopped operating.Under triggering state, wiring board 12 is according to mode selector 25
Selection result, control motor 16 work.Mode selector 25, can be triggered output letter by user
Number, thus set electric tool 10 and be in first mode or the second pattern.Trigger 24 and pattern choosing
Select device 25 to be all electrically connected with wiring board 12.The electricity of various electronic component composition is set on wiring board 12
Road, including control unit 26.Control unit 26 receives trigger 24 and mode selector 25
Signal, control motor 16 work.When electric tool 10 is in first mode and trigger 24
When being triggered, control unit 26 controls motor 16 and rotates continuously.When electric tool 10 is in the second pattern
And trigger 24 is when being triggered, control unit 26 controls motor 16 intermittent rotary, i.e. motor 16 and hands over
For rotary state and halted state occur.The duty of motor 16 passes to output shaft 22 further,
So that output shaft 22 correspondingly rotates or intermittent rotary continuously.
As in figure 2 it is shown, mode selector 25 includes that first mode selects device 251 and the choosing of the second pattern
Select device 253, when first mode selects device 251 to be triggered, set electric tool 10 and be in first
Pattern, when the second mode selector 253 is triggered, sets electric tool 10 and is in the second pattern.
Preferably, first mode selects device 251 be arranged on cabinet top and can be lit, the second model selection
Device 253 and first mode select device 251 be arranged on cabinet top side by side and can be lit, when the
When one mode selector 251 or the second mode selector 253 are triggered, control unit 26 controls
One mode selector 251 or the second mode selector 253 are lit.Owing to first mode selects dress
Put 251 and second mode selector 253 have and light function, thus can clearly, directly inform behaviour
Its selection result of author.
The concrete form of mode selector 25 can also be for selecting device 251 and the second mould by first mode
Formula selects the selection device that device 253 merges, and operator presses and represents its selection first
Pattern, operator presses twice, represents it and selects the second pattern.
As it is shown on figure 3, wiring board 12 farther includes detector unit 30, electrical switch 32, voltage-mode
Block 34.The energy of power supply 18 is converted to be suitable for the electricity of each component working of wiring board 12 by voltage module 34
Pressure.Detector unit 30 detection characterizes the parameter of output shaft 22 load, and is passed to by the signal detected
Control unit 26.Control unit 26 receives detector unit 30 and the signal of mode selector 25 transmission,
And the duty of motor 16 is controlled according to the signal received.Control unit 26 is by controlling electrical switch
The duty of 32 controls the duty of motor 16.Electrical switch 32 has off-state and Guan Bi
State, in the off state, the energy transmission of power supply 18 to motor 16 is terminated, in closed state,
The energy transmission of power supply 18 to motor 16 is allowed to.The duty of motor 16 includes rotating continuously,
Have a rest rotation, stop operating.Rotation i.e. motor 16 exports continuous print rotation incessantly continuously.Intermittent rotary
I.e. motor 16 is alternately present rotary state and resting state；The i.e. motor 16 that stops operating is continuous static shape
State.
As a example by direct current electric power tools, control unit 26 controls output shaft 22 by electrical switch 32
The concrete mode being alternately present rotary state and resting state has: the 1) high-frequency PWM being interrupted by transmission
Signal realizes output shaft 22 to electrical switch 32 and is alternately present rotary state and resting state, works as transmission
During pwm signal, there is the break-make of high frequency in electrical switch 32, and motor 16 is rotary state, when not sending out
When sending pwm signal, electrical switch 32 is to disconnect continuously, and motor 16 is resting state, output shaft 22
For quiescent phase；2) output shaft 22 is realized by transmission high level/low level signal to electrical switch 32
It is alternately present rotary state and resting state, when the signal sent is high level signal, electrical switch 32
Guan Bi, motor 16 is rotary state, and when the signal sent is low level signal, electrical switch 32 is
Disconnecting, motor 16 is resting state；3) realized to electrical switch 32 by transmission low frequency pwm signal
Output shaft 22 is alternately present rotary state and resting state, and the pwm signal of this low frequency is that frequency is extremely low
The high level being alternately present and low level signal, when wherein high level signal occurs, electrical switch 32 closes,
Motor 16 is rotary state, and when low level signal occurs, electrical switch 32 is disconnection, motor 16
For resting state.
When the second mode selector 253 is triggered, electric tool 10 enters the second pattern, controls single
Unit 26 controls electrical switch 32 by the way so that motor 16 intermittent rotary, is i.e. alternately present and turns
Dynamic state and resting state.
When first mode selects device 251 to be triggered, electric tool 10 enters first mode, controls single
Unit 26 controls electrical switch 32 by the way so that motor 16 rotates continuously.In the process,
Detector unit 30 detection characterizes the parameter of output shaft 22 load, and testing result is passed to control unit
26, control unit 26 carries out computing to the parameter characterizing output shaft 22 load, it is judged that characterize output shaft 22
Whether the parameter of load reaches pre-conditioned.In the first better embodiment, when characterizing output shaft 22
When the parameter of load meets pre-conditioned, control electric tool 10 and enter the second pattern, i.e. control motor
16 intermittent rotaries.In the second better embodiment, when the parameter characterizing output shaft 22 load meets pre-
If during condition, control motor 16 and stop operating.
First better embodiment and the pre-conditioned of the second better embodiment can be to characterize output shaft
The parameter of 22 loads reaches setting value, it is also possible to reach for characterizing the change of the parameter of output shaft 22 load
Setting value.The change of the parameter characterizing output shaft 22 load includes that first derivative, second dervative, high-order are led
Any one in the function of number and any one derivative aforementioned.Below as a example by the function of second dervative
The function of derivative is illustrated.The function of second dervative can be second dervative itself, or leads with second order
Number is the arbitrary functions of variable, and product, second order such as higher derivative, parameter and the second dervative of parameter are led
Number and the product of a fixed constant, the n power of second dervative, second dervative and corresponding first derivative
Product, second dervative and corresponding first derivative and the product of parameter, second dervative level off to plus certain
Ask again after the value of 90 tan value (such as tan (89+ second dervative)), second dervative cotangent value (as
Ctan (second dervative)), with arbitrary value a as the truth of a matter and right as antilog of numerical value 1 and the difference of second dervative
Any one situations such as number functional value (such as loga (1-second dervative)).
Preferably, the pre-conditioned function for the second dervative of the parameter characterizing output shaft 22 load reaches to set
Definite value.Being more highly preferred to, the second dervative of the pre-conditioned parameter for characterizing output shaft 22 load reaches to set
Definite value.
The parameter characterizing output shaft 22 load can be the electric current flowing through motor 16, it is also possible to be voltage,
As detected the ohmically pressure drop or the pressure drop at motor 16 two ends or power supply 18 two ends connected with motor 16
Voltage；Or rotating speed, as used Hall effect detecting element (Hall Sensor) to detect motor
16 or the rotating speed of output shaft 22；Or the efficiency of motor 16, such as the output by calculating motor 16
With input power than the efficiency detecting motor 16；Or the efficiency of electric tool 10, as by meter
Calculate the output of power supply 18 and the output of output shaft 22 than the efficiency detecting electric tool 10.
Preferably, the parameter characterizing output shaft 22 load is to flow through the electric current of motor 16, because electric current and output
The moment of resistance that axle 22 is subject to has the most direct corresponding relation.
The flow chart of first better embodiment is discussed in detail below in conjunction with Fig. 4.
Step S0, initializes.
Subsequently entering step S2, control unit 26 obtaining mode selects the selection result of device 25.Work as behaviour
Author has carried out model selection, then control unit by triggering mode selector 25 upon initialization
26 obtain this selection result of operators.When operator upon initialization, not over trigger pattern
Select device 25 to carry out model selection, then control unit 26 obtains operator's front trigger mode formula selection
The selection result of device 25.
Subsequently enter step S3, trigger trigger 24.After trigger 24 is triggered, model selection
Device 25 no longer works.After i.e. trigger 24 is triggered, operator is to mode selector 25
Triggering, the mode of operation of electric tool 10 will not be changed.
Enter step S4, according to the selection result of step S2, control motor 16 and enter corresponding Working mould
Formula.When the selection result of step S2 is first mode, enter step S6；When the selection of step S2 is tied
When fruit is the second pattern, enter step S8.
In step S6, control unit 26 controls motor 16 and rotates continuously.In direct current electric power tools 10,
The mode that control motor 16 rotates continuously usually applies pwm signal, in AC electrical instrument 10,
Control the mode usually control silicon controlled angle of flow that motor 16 rotates continuously.Explanation is needed at this
It is that, during the whole control of above-mentioned control mode, the electric current of power supply 18 to motor 16 there will be short
The interruption of time, but owing to the break period is extremely short, it is not result in that motor 16 stops operating, the most whole mistake
Cheng Zhong, the presentation of motor 16 is to rotate continuously.
After step S6, enter step S10.In step S10, detector unit 30 detection characterizes output
The parameter of axle 22 load, and testing result is passed to control unit 26.Characterize output shaft 22 load
Parameter can be the electric current flowing through motor 16, it is also possible to be voltage, the electricity connected with motor 16 such as detection
Pressure drop in resistance or the pressure drop at motor 16 two ends or the voltage at power supply 18 two ends；Or rotating speed, as adopted
Motor 16 or the rotating speed of output shaft 22 is detected with Hall effect detecting element (Hall Sensor)；Or
Person is the efficiency of motor 16, as the output and input power ratio by calculating motor 16 detects motor 16
Efficiency；Or the efficiency of electric tool 10, such as output and output by calculating power supply 18
The output of axle 22 is than the efficiency detecting electric tool 10.Preferably, output shaft 22 is characterized negative
The parameter carried is to flow through the electric current of motor 16, because the moment of resistance that electric current and output shaft 22 are subject to has
Directly corresponding relation.
After step S10, enter step S12.In step S12, control unit 26 judges to characterize output
Whether the parameter of axle 22 load meets pre-conditioned.Pre-conditioned can be to characterize output shaft 22 load
Parameter reaches setting value, and as electric current exceedes preset value, speed is less than preset value etc..Pre-conditioned all right
Setting value is reached for characterizing the change of the parameter of output shaft 22 load.The change of parameter can be the change of parameter
The change of the rate of change of rate or parameter, such as first derivative, second dervative, higher derivative or any one
Plant the function of derivative.Preferably, the pre-conditioned second dervative being to characterize the parameter that output shaft 22 loads
Function reaches setting value.It is more highly preferred to, the second order of the pre-conditioned parameter for characterizing output shaft 22 load
Derivative reaches setting value.
When the judged result of step S12 is for being, enter step S8；When the judged result of step S12 is no,
Enter step S6.
In step S8, control unit 26 controls motor 16 intermittent rotary, i.e. controls motor 16 and replaces
Existing rotary state and resting state.
The flow chart of second better embodiment is discussed in detail below in conjunction with Fig. 5.
Step S30 as shown in Figure 5 is identical with the step S0 to S12 shown in Fig. 4 to step S42,
Do not repeat them here.Fig. 5 illustrated embodiment compares being improved by of Fig. 4 illustrated embodiment, works as control
Unit 26 processed judges, when the parameter of sign output shaft 22 load reaches pre-conditioned, no longer to control motor 16
Enter the second pattern, but control motor 16 and stop operating.I.e. no longer proceed to step after step S42
S38, but enter step S44.In step S44, control unit 26 controls motor 16 and stops operating.
Although the electric tool 10 of display is electric drill in accompanying drawing, but it is merely illustrative, the present invention
It is equally applicable to other electric tools such as screwdriver.Owing to this application is for the ordinary skill people of this area
For Yuan, can be realized easily, so applicant is no longer repeated at this by above-mentioned embodiment.
Claims (10)
1. an electric tool, it is characterised in that described electric tool includes:
Housing,
Output shaft, is arranged in the housing；
Motor, drives the rotation of output shaft；
Mode selector, by user's trigger output signal, selectively sets electric tool and is in the first mould
Formula or the second pattern；
Control unit, receives the signal of mode selector transmission, controls the work of motor；
When electric tool is in first mode, control unit controls motor and rotates continuously, at electric tool
When the second pattern, control unit controls motor intermittent rotary.
Electric tool the most according to claim 1, it is characterised in that described electric tool also includes inspection
Surveying the detector unit of the parameter characterizing output shaft load, control unit is according to mode selector and detection
The signal of unit transmission, controls the work of motor；When electric tool is in first mode, control unit
Receive the signal of detector unit transmission, when the parameter characterizing output shaft load meets pre-conditioned, control
Electric tool processed enters the second pattern.
Electric tool the most according to claim 1, it is characterised in that described electric tool also includes inspection
Surveying the detector unit of the parameter characterizing output shaft load, control unit is according to mode selector and detection
The signal of unit transmission, controls the work of motor；When electric tool is in first mode, control unit
Receive the signal of detector unit transmission, when the parameter characterizing output shaft load meets pre-conditioned, control
Motor processed stops operating.
4. according to the electric tool described in Claims 2 or 3 any one, it is characterised in that described default
Condition is that the parameter characterizing output shaft load reaches setting value.
5. according to the electric tool described in Claims 2 or 3 any one, it is characterised in that described default
Condition is that the change of the parameter characterizing output shaft load reaches setting value.
Electric tool the most according to claim 5, it is characterised in that described pre-conditioned defeated for characterizing
The function of the second dervative going out the parameter of axle load reaches setting value.
Electric tool the most according to claim 6, it is characterised in that described pre-conditioned defeated for characterizing
The second dervative of the parameter going out axle load reaches setting value.
Electric tool the most according to claim 1, it is characterised in that described mode selector includes
First mode selects device and the second mode selector, when first mode selects device to be triggered,
Set electric tool and be in first mode, when the second mode selector is triggered, set electronic work
Tool is in the second pattern.
Electric tool the most according to claim 8, it is characterised in that described first mode selects device
Being arranged on cabinet top and can be lit, the second mode selector and first mode select device arranged side by side
Be arranged on cabinet top and can be lit, when first mode selects device or the second mode selector
When being triggered, control unit controls first mode and selects device or the second mode selector to be lit.
Electric tool the most according to claim 1, it is characterised in that described sign output shaft loads
Parameter be to flow through the electric current of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510224177.4A CN106181900A (en) | 2015-05-05 | 2015-05-05 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510224177.4A CN106181900A (en) | 2015-05-05 | 2015-05-05 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106181900A true CN106181900A (en) | 2016-12-07 |
Family
ID=57458813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510224177.4A Pending CN106181900A (en) | 2015-05-05 | 2015-05-05 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106181900A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111093921A (en) * | 2017-07-24 | 2020-05-01 | 费斯托工具有限责任公司 | Power tool and method for identifying a kickback event of a power tool |
| TWI700154B (en) * | 2019-04-18 | 2020-08-01 | 簡毓臣 | How to operate electric tools |
| CN111491762A (en) * | 2017-09-30 | 2020-08-04 | 苏州宝时得电动工具有限公司 | Electric tool and control device thereof |
| WO2020200188A1 (en) * | 2019-04-04 | 2020-10-08 | 南京德朔实业有限公司 | Smart electric tool and system having same, and control method |
| CN112140066A (en) * | 2019-06-11 | 2020-12-29 | 苏州宝时得电动工具有限公司 | Electric tool |
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| US20040070369A1 (en) * | 2002-10-11 | 2004-04-15 | Makita Corporation | Adapters for battery chargers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111093921A (en) * | 2017-07-24 | 2020-05-01 | 费斯托工具有限责任公司 | Power tool and method for identifying a kickback event of a power tool |
| CN111491762A (en) * | 2017-09-30 | 2020-08-04 | 苏州宝时得电动工具有限公司 | Electric tool and control device thereof |
| CN109590949B (en) * | 2017-09-30 | 2021-06-11 | 苏州宝时得电动工具有限公司 | Control device and method for power tool and power tool |
| CN111491762B (en) * | 2017-09-30 | 2023-08-11 | 苏州宝时得电动工具有限公司 | Electric tool and control device thereof |
| WO2020200188A1 (en) * | 2019-04-04 | 2020-10-08 | 南京德朔实业有限公司 | Smart electric tool and system having same, and control method |
| TWI700154B (en) * | 2019-04-18 | 2020-08-01 | 簡毓臣 | How to operate electric tools |
| CN111865180A (en) * | 2019-04-18 | 2020-10-30 | 简毓臣 | Method for operating electric tool |
| CN112140066A (en) * | 2019-06-11 | 2020-12-29 | 苏州宝时得电动工具有限公司 | Electric tool |
| CN112140066B (en) * | 2019-06-11 | 2024-04-09 | 苏州宝时得电动工具有限公司 | Electric tool |
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