CN108858020A - A kind of electric tool and its power control apparatus - Google Patents
A kind of electric tool and its power control apparatus Download PDFInfo
- Publication number
- CN108858020A CN108858020A CN201811025388.5A CN201811025388A CN108858020A CN 108858020 A CN108858020 A CN 108858020A CN 201811025388 A CN201811025388 A CN 201811025388A CN 108858020 A CN108858020 A CN 108858020A
- Authority
- CN
- China
- Prior art keywords
- cover board
- control apparatus
- control unit
- power control
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
Abstract
It further includes pedestal and the cover board that can be fastened on the pedestal that the invention discloses a kind of power control apparatus applied to electric tool including the power supply line to power to tool body；The pedestal and the cover board one of both, which are equipped with, to be connected, to control the control unit for being powered and powering off to tool body with the power supply line；Another one, which is equipped with, realizes the trigger being powered with de-energizing actions to trigger the control unit；Wherein, when the cover board is fastened on the pedestal, the trigger triggers the control unit, and the control unit executes energization movement, to realize that the power supply line is powered to tool body.Above-mentioned power control apparatus is easily manipulated, and can shorten the delay time of toggle switch, improves the efficiency of assembly, reduces the waste of cost, solves the problems, such as to need repeatedly to carry out board assembly.In addition, the invention also discloses a kind of electric tools including above-mentioned power control apparatus.
Description
Technical field
The present invention relates to Automatic manual transmission fields, more particularly, to a kind of power control apparatus applied to electric tool, also
It is related to a kind of electric tool including above-mentioned power control apparatus.
Background technique
It is well known that many fields require the process for carrying out component assembly, by taking electronic technology field as an example, with electronics
The development of technology, the achievable function of electronic equipment is more and more, and the electronic equipment with power usually has plurality
The board (also known as printed circuit board) of amount, and the surface of board is equipped with many electronic components and route, if one of member
Part or a route are impaired, and entire board is not just available, therefore, when carrying out board assembly, it is ensured that it is assembled without wound.If
In the way of manually assembling, screwdriver is easy to skid off out of bolt slot, and is possible to scratch board, if utilizing electronic spiral shell
When silk knife is assembled, switch is set on the handle of electric screw driver, when toggle switch, easily causes electric screw driver hair
Raw shift phenomenon, gently then skids off out of bolt slot, scratches board, life security that is heavy then jeopardizing operator, in addition, electronic spiral shell
The volume of switch of silk knife is small, is not easy to stir, and assembly can be made to generate certain delay time, in deferring procedure, electric screw driver
High speed rotation, easily generation stripped thread phenomenon make the tightness decline of assembly, and since the hole of assembly is generally disposed at the side of board
Therefore angle may cause the problem of board cracks when stripped thread phenomenon occurs.Above situation will lead to board and scrap, so
One, the board that just more to renew simultaneously is assembled again, and the extra cost that board is separately manufactured can also generate therewith.
In conclusion how to efficiently solve need repeatedly carry out board assembly and how to reduce due to damage board and
Caused extra cost is current those skilled in the art's urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of power control apparatus applied to electric tool, which is easy to
Manipulation, can shorten the delay time of toggle switch, improve the efficiency of assembly, reduce the waste of cost, and it is multiple to solve needs
The problem of carrying out board assembly.
To achieve the above object, the present invention provides a kind of power control apparatus applied to electric tool, including to
The power supply line of tool body power supply, further includes pedestal and the cover board that can be fastened on the pedestal；The pedestal and the cover board two
One of person, which is equipped with, to be connected, to control the control unit for being powered and powering off to tool body with the power supply line；Another one, which is equipped with, to be used
The trigger being powered with de-energizing actions is realized to trigger the control unit；Wherein, when the cover board is fastened on the pedestal, institute
It states trigger and triggers the control unit, the control unit executes energization movement, to realize that the power supply line is powered to tool body.
Preferably, the pedestal includes to realize the cavity fastened with the cover board, wherein the control unit is set to institute
Cavity is stated, the trigger is set to the cover board.
Preferably, the turning part fastened to realize the cover board overturning is equipped between the cavity and the cover board；Its
In, the shaft of turning part is parallel to the long side of the cavity.
Preferably, the cover board includes the handle to extend along the plane of flattening of the cover board；Wherein, it the handle and described turns over
Transfer part is set to the two sides of the cover board.
Preferably, multiple control units are equipped in the cavity, the cover board is correspondingly provided with multiple triggers,
To realize that the power supply line is powered to multiple tool bodies.
Preferably, multiple placing grooves to place multiple tool bodies are additionally provided in the cavity.
Preferably, it is additionally provided in the cavity：The tracking transducer of job schedule to equipments of recording ontology；With it is described
Tracking transducer be connected, the indicator to show job schedule.
Preferably, the tracking transducer is specially precession revolution recorder or precession displacement record instrument.
Relative to above-mentioned background technique, power control apparatus provided by the invention is controlled using cover board returning buckle together in pedestal
Power supply line is powered to electric screw driver, and pedestal is equipped with control unit, and cover board is equipped with trigger, when cover board is fastened on pedestal, triggering
Device triggers the receiver of control unit, and control unit executes energization movement, and to realize that power supply line is powered to electric screw driver, screw passes through
Electric screw driver precession into the screw hole of board immediately removes cover board from pedestal when screw is completely screwed into the screw hole of board,
Separate trigger mutually with receiver, control unit executes de-energizing actions, and electric screw driver stops working, in the process of overturning cover board
In, tool body avoids board caused by shifting because of screwdriver from scratching not by external force.In addition, in order to make to operate
Personnel guarantee its life security far from erecting yard, and the tracking that progress is screwed in record electric screw driver is additionally provided in pedestal
Sensor and the indicator to show screw-in progress, when electric screw driver completes board assembly, indicator sending has been assembled
Electric screw driver is set to stop working to prompt operator to remove cover board immediately at signal.
It is a further object of the present invention to provide a kind of electric tools, are connected including tool body and with the tool body
Power control apparatus, the power control apparatus are specially power control apparatus described in above-mentioned any one.
Preferably, the tool body is specially electric drill or electric screw driver.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram of electric tool provided by the invention；
Wherein,
1- electric tool, 2- electric screw driver, 3- power control apparatus, 4- power supply line, 5- cover board, 51- trigger, 6- chamber
Body, 61- control unit, 611- relay, 612- receiver, 7- turning part.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make those skilled in the art more fully understand the present invention program, with reference to the accompanying drawing and it is embodied
The present invention is described in further detail for mode.
Referring to FIG. 1, Fig. 1 is the structural schematic diagram of electric tool provided by the invention.
Power control apparatus 3 provided by the present invention applied to electric tool, including to power to tool body
Power supply line 4 further includes open boxed basement and the cover board 5 that can be fastened on pedestal, and pedestal and 5 one of both of cover board are equipped with control
Portion 61, control unit 61 are connected with power supply line 4, and whether to control power supply line 4 to tool body energization, another one is equipped with trigger
51, to trigger control unit 61, specifically, when cover board 5 is fastened on pedestal, trigger 51 triggers control unit 61, control unit
61 execute energization movement, and power supply line 4 is powered to tool body, when tool body needs to power off, remove cover board 5 from pedestal, this
When, trigger 51 disconnects the triggering connection relationship with control unit 61, and control unit 61 executes de-energizing actions namely power supply line 4 stops
It powers to tool body, tool body stops working.
Herein in addition to special instruction, in order to express easily, tool body is replaced with electric screw driver 2, and function is
Bolt slot is resisted with cutter head and is screwed in bolt in screw hole by rotation.
Above-mentioned pedestal is equipped with closed cavity 6, and control unit 61 is arranged in cavity 6, and specifically, control unit 61 includes but not
It is limited to the combination of relay 611 and receiver 612, relay 611 is located inside cavity 6, and is connected with power supply line 4, to control
Power supply line 4 processed is powered and powers off to electric screw driver 2, and receiver 612 is located at 6 surface of cavity, and correspondingly, trigger 51 is set to
Cover board 5, when cover board 5 is fastened on the cavity 6 on pedestal, trigger 51 is in contact to realize trigger action with receiver 612,
Under the action of trigger action, the energization contact in relay 611 is connected with normally opened contact, and relay 611 connects circuit, power supply line
4 power to electric screw driver 2, when electric tool 1 needs to power off, cavity 6 of the cover board 5 from pedestal are removed, trigger 51
It is separated with receiver 612, the energization contact in relay 611 is connected with normally-closed contact, and electric screw driver 2 stops precession bolt.
What needs to be explained here is that above-mentioned trigger action is not limited to contact triggering, contactless triggering can also be, than
If trigger 51 and 612 one of both of receiver are equipped with light source, another one is equipped with photosensitive sensor, when photosensitive sensor receives light
Trigger action is realized when line.
Cover board 5 is fastened in order to facilitate the operation of personnel, operator is made to be not necessarily to during fastening by trigger 51 and be received
Device 612 is aligned, and turning part 7 is arranged in the side of cover board 5 and cavity 6, is fixed on turning part 7 with one end for cover board 5
Shaft and can be overturn around the shaft of turning part 7, it is to be understood that in order to shorten the arm of force in switching process to subtract
The rotary movement amplitude of small operator, the shaft of turning part 7 should be parallel to the longer one side of cavity 6, certainly, turning part 7
Shaft can also be parallel to the shorter setting on one side of cavity 6.
What needs to be explained here is that above-mentioned turning part 7 includes but is not limited to hinge, two firm bankings difference of the hinge
Connecting cover plate 5 and cavity 6, so that cover board 5 can be overturn around the shaft of hinge.It is of course also possible in cover board 5 and cavity 6
Shaft is arranged in one of both, and axis hole is arranged in another one, and shaft is set in axis hole the overturning for realizing cover board 5.
In order to which operator more easily lifts cover board 5, above-mentioned cover board 5 is extended with handle along its plane of flattening, certainly, should
The part that handle is connect with cover board 5 can also accompany certain angle with the surface of cover board 5, and handle is being preferably disposed on turning part 7 just
Pair side, certain handle can also be set to 7 place side of turning part adjacent side, as long as facilitate operator carry out cover board 5 overturn
, what needs to be explained here is that, the handle and cover board 5 can also be wholely set with assembly and connection.
When cover board 5 is made of conductive materials such as iron or copper, in order to avoid operator gets an electric shock, above-mentioned handle is preferred
It is made of insulation such as plastics, naturally it is also possible to insulation sleeve is set on handle.
In order to make operator far from erecting yard, namely the progress for remotely controlling assembly is allowed the operator to, and protect
Card operator is able to observe that assembly progress to prevent assembly from not completing or excessively assembling, and is additionally provided with tracking in above-mentioned cavity 6
Sensor and indicator, tracking transducer are connected to record bolt precession progress with electric screw driver 2, and indicator and tracking pass
Sensor is connected, to show the progress to operator.
In the first embodiment, above-mentioned tracking transducer is specially the recorder for recording precession revolution, it is well known that spiral shell
Bolt has certain thread turns, for example 100 circles, revolution, that is, bolt precession screw hole circle number that electric screw driver 2 rotates work as electricity
When dynamic screwdriver 2 starts rotation, namely when bolt starts to screw in screw hole, which just records the rotation of electric screw driver 2
Revolution, and the progress of real-time precession is shown by indicator to operator, wherein the progress can be revolved using electric screw driver 2
The circle number turned indicates, when 100 circle of rotation of electric screw driver 2, represents assembly and is exactly completed, operator is aobvious according to indicator
The real-time progress overturning cover board 5 of the assembly shown namely trigger 51 are separated with receiver 612, and relay 611 executes de-energizing actions,
Power supply line 4 stops powering to electric screw driver 2.
In second of embodiment, above-mentioned tracking transducer is specially precession displacement record instrument, according to common sense bolt
A length of 5 centimetres of threaded bar are set with certain assembly length, such as bolt, displacement, that is, bolt of 2 precession of electric screw driver
The length of precession screw hole, when electric screw driver 2 starts rotation, namely when bolt starts to screw in screw hole, recorder record
The displacement of 2 precession of electric screw driver, and pass through the progress that indicator shows precession to operator, wherein the progress is available
The displacement of 2 precession of electric screw driver is indicated, and when 5 centimetres of 2 precession of electric screw driver, is represented assembly and is exactly completed, operate
Personnel separate according to the real-time progress overturning cover board 5 of assembly namely trigger 51 of indicator for displaying with receiver 612, relay
611 execute de-energizing actions, and power supply line 4 stops powering to electric screw driver 2.
What needs to be explained here is that 100 circles in above two embodiment are only for example these parameters with 5 centimetres
Depending on should be according to the bolt model that actual needs is assembled.
In the third embodiment, above-mentioned indicator is specially Lamplight displayer, when the process of 2 precession of electric screw driver
In, the red light of Lamplight displayer is bright, when bolt is fully screwed into screw hole just, the green light of Lamplight displayer, at this point, operator
Member should overturn cover board 5 immediately, and electric screw driver 2 is made to stop rotating.
In the 4th kind of embodiment, above-mentioned indicator is specially digital display, during 2 precession of electric screw driver,
The digital display shows the percentage of precession progress, the percentage represent the circle number (or displacement) of the rotation of electric screw driver 2 with
The ratio of the thread turns (or length) of bolt, when it shows a hundred percent, operator overturns cover board 5, makes electric screw
Knife 2 stops rotating.
What needs to be explained here is that the indicator (Lamplight displayer and digital display) in above-mentioned two embodiment is usual
It is set to the surface of cavity 6, and during being assembled, cover board 5 is fastened on the surface of cavity 6, will affect operation in this way
Personnel monitor assembly progress, therefore cover board 5 should be made of translucent material.It is understood that operator may with colour blindness,
The dyschromatopsias disease such as anomalous trichromatism, therefore in order to avoid the display color of 5 filter indicator of cover board and cause to be difficult to judge to have assembled
At puzzlement, cover board 5 is preferably made of colorless and transparent material.In addition, available two kinds of the light color of indicator are extremely easy
The color of difference indicates, and is provided with buzzer, and buzzer issues the sound so that operator knows when assembling has been completed.
In the 5th kind of embodiment, by the enlightenment of the 4th kind of embodiment, it is aobvious that above-mentioned indicator can use multiple light
Show precession progress, for example, five Lamplight displayers are arranged on cavity 6, above-mentioned Lamplight displayer successively respectively indicates 20%,
40%, 60%, 80% and 100% progress percentage, when precession progress reaches corresponding percentage, corresponding light is aobvious
Show that device holding is always on state, until operator, which overturns cover board 5, carries out precession to stop electric screw driver 2.
What needs to be explained here is that these numbers of five, 20%, 40%, 60%, 80% and 100% in above-described embodiment
Value can be configured according to actual needs, be only for example herein.
In order to realize the different types of bolt of assembly, the bolt of preferably four kinds common models, set in above-mentioned cavity 6 there are four
Control unit 61, each control unit 61 control the energized state of an electric screw driver 2, correspondingly, be arranged four cover boards 5 and
Trigger 51 is set on each cover board 5, when needing to assemble one or more of bolts, corresponding cover board 5 is fastened, for right
The electric screw driver 2 answered carries out assembly process.
The placing groove to place four electric screw drivers 2 is additionally provided in above-mentioned cavity 6, after entire control power-off, electricity
Dynamic screwdriver 2 is retracted into placing groove.Certainly, above-mentioned placing groove can be set partition and constitute four holding chambers, each placement
Place an electric screw driver 2 in room.
Correspondingly, four tracking transducers that assembly is remotely controlled for operator and four are additionally provided in above-mentioned cavity 6
Indicator.
Cover board 5 is overturn in order to facilitate the operation of personnel, aforementioned four cover board 5 is fixed by bolts in a large cover, at this time
Operator only fastens the assembly of i.e. controllable four electric screw drivers 2 of the large cover, certainly, when not needing certain electric screw
When knife 2 assembles, corresponding cover board 5 can be dismantled on large cover.What needs to be explained here is that large cover can be according to above-mentioned cover board
5 use condition is designed.
In order to facilitate the assembly of synchronously control different model bolt, the precession progress of above-mentioned electric screw driver 2 should keep same
Step, specifically, the revolving speed or precession speed of electric screw driver 2 is accordingly arranged for different bolts, makes different type bolt
Precession progress percentage keep synchronize, can be shown using an indicator as used in the 4th or the 5th kind of embodiment
Show assembly progress.
What needs to be explained here is that above-mentioned be directed to the description about four this numerical value such as four kinds and four only as an example
Son, this numerical value should be in the light of actual conditions configured.
A kind of electric tool 1 provided by the present invention, including tool body further include described in above-mentioned specific embodiment
The energized state of power control apparatus 3, tool body is controlled by power control apparatus 3, and above-mentioned tool body can be electric drill
Or electric screw driver 2, it is also possible to the combination of electric drill and electric screw driver 2；The other parts of electric tool 1 are referred to existing
Technology, it is not reinflated herein.
It should be noted that in the present specification, such as first and second etc relational terms are used merely to one
Entity is distinguished with other several entities, and without necessarily requiring or implying between these entities, there are any this actual
Relationship or sequence.
Electric tool provided by the present invention and its power control apparatus are described in detail above.It is used herein
A specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only helping to understand
Method and its core concept of the invention.It should be pointed out that for those skilled in the art, not departing from this
, can be with several improvements and modifications are made to the present invention under the premise of inventive principle, these improvement and modification also fall into the present invention
In scope of protection of the claims.
Claims (10)
1. a kind of power control apparatus (3) applied to electric tool, including the power supply line (4) to power to tool body,
It is characterized in that, further including pedestal and the cover board (5) that the pedestal can be fastened on；
The pedestal and the cover board (5) one of both, which are equipped with, to be connected with the power supply line (4), is logical to tool body to control
The control unit (61) of electricity and power-off；Another one, which is equipped with, realizes the triggering being powered with de-energizing actions to trigger the control unit (61)
Device (51)；
Wherein, when the cover board (5) is fastened on the pedestal, the trigger (51) triggers the control unit (61), described
Control unit (61) executes energization movement, to realize that the power supply line (4) is powered to tool body.
2. power control apparatus (3) according to claim 1, which is characterized in that the pedestal include to the lid
Plate (5) realizes the cavity (6) fastened, wherein the control unit (61) is set to the cavity (6), and the trigger (51) is set to
The cover board (5).
3. power control apparatus (3) according to claim 2, which is characterized in that the cavity (6) and the cover board (5)
Between be equipped with to realize the cover board (5) overturning fasten turning part (7)；Wherein, the shaft of turning part (7) is parallel to
The long side of the cavity (6).
4. power control apparatus (3) according to claim 3, which is characterized in that the cover board (5) includes along the cover board
(5) handle that the plane of flattening extends；Wherein, the handle and turning part (7) are set to the two sides of the cover board (5).
5. power control apparatus (3) according to claim 3, which is characterized in that be equipped in the cavity (6) multiple described
Control unit (61), the cover board (5) are correspondingly provided with multiple triggers (51), to realize the power supply line (4) to multiple
Tool body power supply.
6. power control apparatus (3) according to claim 5, which is characterized in that be additionally provided with multiple use in the cavity (6)
To place the placing groove of multiple tool bodies.
7. according to power control apparatus described in claim 2 to 6 any one (3), which is characterized in that in the cavity (6)
It is additionally provided with：
The tracking transducer of job schedule to equipments of recording ontology；
It is connected with the tracking transducer, the indicator to show job schedule.
8. power device according to claim 7, which is characterized in that the tracking transducer is specially precession revolution record
Instrument or precession displacement record instrument.
9. a kind of electric tool (1), special including tool body and the power control apparatus being connected with the tool body (3)
Sign is that the power control apparatus (3) is specially power control apparatus described in claim 1 to 8 any one (3).
10. electric tool (1) according to claim 9, which is characterized in that the tool body is specially electric drill or electronic
Screwdriver (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025388.5A CN108858020A (en) | 2018-09-04 | 2018-09-04 | A kind of electric tool and its power control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811025388.5A CN108858020A (en) | 2018-09-04 | 2018-09-04 | A kind of electric tool and its power control apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108858020A true CN108858020A (en) | 2018-11-23 |
Family
ID=64322989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811025388.5A Pending CN108858020A (en) | 2018-09-04 | 2018-09-04 | A kind of electric tool and its power control apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108858020A (en) |
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|---|---|---|---|---|
| CN2933976Y (en) * | 2006-06-16 | 2007-08-15 | 翟和生 | Portable vehicle-mounted tool cabinet |
| CN202396116U (en) * | 2011-12-23 | 2012-08-22 | 大洋电机新动力科技有限公司 | Cover opening safety protection structure of controller |
| US20130082627A1 (en) * | 2011-10-03 | 2013-04-04 | Yoshitaka Ichikawa | Motor current detection apparatus, motor controller, and electric power tool |
| CN204748546U (en) * | 2015-03-02 | 2015-11-11 | 伍顺四 | Hand electric tool |
| CN205539196U (en) * | 2016-01-29 | 2016-08-31 | 东旭（营口）光电显示有限公司 | Resistance measuring device |
| CN107294466A (en) * | 2016-04-05 | 2017-10-24 | 德昌电机(深圳)有限公司 | Electric tool and its motor driven systems |
| CN107662002A (en) * | 2017-10-31 | 2018-02-06 | 南通豪鼎光伏科技有限公司 | A kind of safe electric drill |
-
2018
- 2018-09-04 CN CN201811025388.5A patent/CN108858020A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2933976Y (en) * | 2006-06-16 | 2007-08-15 | 翟和生 | Portable vehicle-mounted tool cabinet |
| US20130082627A1 (en) * | 2011-10-03 | 2013-04-04 | Yoshitaka Ichikawa | Motor current detection apparatus, motor controller, and electric power tool |
| CN202396116U (en) * | 2011-12-23 | 2012-08-22 | 大洋电机新动力科技有限公司 | Cover opening safety protection structure of controller |
| CN204748546U (en) * | 2015-03-02 | 2015-11-11 | 伍顺四 | Hand electric tool |
| CN205539196U (en) * | 2016-01-29 | 2016-08-31 | 东旭（营口）光电显示有限公司 | Resistance measuring device |
| CN107294466A (en) * | 2016-04-05 | 2017-10-24 | 德昌电机(深圳)有限公司 | Electric tool and its motor driven systems |
| CN107662002A (en) * | 2017-10-31 | 2018-02-06 | 南通豪鼎光伏科技有限公司 | A kind of safe electric drill |
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Application publication date: 20181123 |