CN105215951A - Polishing machine - Google Patents
Polishing machine Download PDFInfo
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- CN105215951A CN105215951A CN201410242478.5A CN201410242478A CN105215951A CN 105215951 A CN105215951 A CN 105215951A CN 201410242478 A CN201410242478 A CN 201410242478A CN 105215951 A CN105215951 A CN 105215951A
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- polishing machine
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- brushless electric
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Abstract
The invention discloses a kind of polishing machine, comprise casing (7) and be arranged at the head capsule (1) on casing (7) top, head capsule is provided with high power density brushless electric machine in (1), and the controller (5) of high power density brushless electric machine is arranged in casing (7); High power density brushless electric machine comprises the armature spindle (2) that rotation is arranged at head capsule (1), and armature spindle (2) and the driving shaft of the polishing rotating disk (6) of polishing machine coaxially arrange and be integral type structure; The axes normal of armature spindle (2) in polishing rotating disk (6) operating surface and through the center of circle of polishing rotating disk (6).Polishing machine provided by the invention, improves device service life, avoids carbon dust to produce, avoid environmental pollution; Avoid arranging transmission device in casing, improve service life, reduce energy loss, improve delivery efficiency, reduce noise and vibration, that avoids travelling gear engagement to install is loaded down with trivial details, effectively reduces volume and the weight of polishing machine, facilitates the assembling of polishing machine.
Description
Technical field
The present invention relates to polissoir technical field, particularly a kind of polishing machine.
Background technology
Polishing machine is a kind of electric tool, and polished fabric or other article complete polishing effect by the polishing disk of polishing machine.
Please refer to Fig. 1, Fig. 1 is a kind of structural representation of polishing machine of the prior art.
Wherein, polishing machine is made up of the motor (comprising rotor 03, stator 04, motor shaft 05 and carbon brush 09) of casing 07, head capsule 01, output shaft 02, the travelling gear 08 be arranged on output shaft 02, the polishing rotating disk 06 being arranged at output shaft 02 end and band carbon brush.Motor is arranged in casing 07, and motor shaft 05 is for gear shaft or arrange gear in its end, makes it engage with travelling gear 08, and then drives the polishing rotating disk 06 being arranged at output shaft 02 end to rotate, and completes polishing.
But current polishing machine generally uses series excited machine, it is with the structure of carbon brush 09, needs gear drive to realize the change of transmission direction and rotating speed between motor shaft 05 and output shaft 08.This makes the energy loss of polishing machine large, reduce the delivery efficiency of instrument, and the wearing and tearing of carbon brush 09 and travelling gear directly affects the service life of polishing machine, and carbon brush 09 weares and teares, generation carbon dust, causes certain pollution to environment; Parts in polishing machine are more, and intermeshing travelling gear inevitably produces larger noise and vibration in the process of passing on Gong, and are not easy to the assembling of polishing machine.
Therefore, how to improve delivery efficiency and service life, avoid environmental pollution, reduce noise and vibration, being convenient to the assembling of polishing machine, is the art personnel problem demanding prompt solutions.
Summary of the invention
In view of this, the invention provides a kind of polishing machine, to improve delivery efficiency and service life, avoid environmental pollution, reduce noise and vibration, be convenient to the assembling of polishing machine.
For achieving the above object, the invention provides following technical scheme:
A kind of polishing machine, comprise casing and be arranged at the head capsule on described casing top, be provided with high power density brushless electric machine in described head capsule, the controller of described high power density brushless electric machine is arranged in described casing;
Described high power density brushless electric machine comprises the armature spindle rotating and be arranged at described head capsule, and the driving shaft of the polishing rotating disk of described armature spindle and described polishing machine coaxially arranges and is integral type structure;
The axes normal of described armature spindle in described polishing rotating disk operating surface and through the center of circle of described polishing rotating disk.
Preferably, in above-mentioned polishing machine, also comprise the fan be arranged on described armature spindle.
Preferably, in above-mentioned polishing machine, described fan is arranged at the below of described rotor core; Or described fan is arranged at the top of described rotor core; Or the quantity of described fan is two, a top being positioned at described rotor core, another is positioned at the below of described rotor core.
Preferably, in above-mentioned polishing machine, described high power density brushless electric machine is without Hall internal rotor high power density brushless electric machine;
Described high power density brushless electric machine also comprises: be sheathed on the rotor core outside described armature spindle, is arranged at the stator outside described rotor core, is arranged at the permanent magnet between described stator and described rotor core.
Preferably, in above-mentioned polishing machine, described stator comprises stator core, multiple cold air duct being wound in the stator enamelled wire group in described stator core and being arranged in described stator core.
Preferably, in above-mentioned polishing machine, described cold air duct is made up of the gap between adjacent two described stator enamelled wire groups and the gap between described stator core and described rotor core.
Preferably, in above-mentioned polishing machine, also comprise power line for being connected with extraneous power frequency AC and the rectification be arranged in described casing and filter;
Insulating sleeve is provided with between described rotor core and described armature spindle.
Preferably, in above-mentioned polishing machine, described head capsule is plastics head capsule.
Preferably, in above-mentioned polishing machine, the power supplier driving described high power density brushless electric machine to run is power brick.
Preferably, in above-mentioned polishing machine, described power brick is arranged in described casing; Or described power brick is arranged at outside described casing, described casing is provided with the interface be connected with described power brick.
As can be seen from above-mentioned technical scheme, polishing machine provided by the invention, driving polishing dial rotation by arranging high power density brushless electric machine, effectively improve the service life of device; And, owing to arranging high power density brushless electric machine, the driving shaft of armature spindle and polishing rotating disk is coaxially arranged, and armature spindle and polishing rotating disk are set to integral structure, avoid and transmission device is set in casing, further increase service life, further, avoid carbon dust to produce, and then avoid environmental pollution, reduce energy loss, improve delivery efficiency.Because armature spindle and polishing rotating disk are integral type structure, effectively prevent the engagement between travelling gear, and then reduce the noise and vibration that produce because of gear drive.Further, because polishing rotating disk is disk, the axes normal of armature spindle in the operating surface of polishing rotating disk and the axis of armature spindle through the center of circle of polishing rotating disk, make the smooth rotation of polishing rotating disk, reduce the noise and vibration that produce because of polishing dial rotation.And the controller of high power density brushless electric machine is arranged in casing, effectively prevent controller external and cause large and make unhandy situation because taking up an area space, so that the use of polishing machine, high power density brushless electric machine is arranged in head capsule, and controller is arranged in casing, after high power density brushless electric machine and controller are communicated to connect, again head capsule and casing are mounted opposite, avoid the loaded down with trivial details of travelling gear engagement installation, effectively reduce volume and the weight of polishing machine, effectively facilitate the assembling of polishing machine.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of polishing machine of the prior art;
Wherein,
Head capsule-01, output shaft-02, rotor-03, stator-04, motor shaft-05, polishing rotating disk-06, casing-07, gear-08, carbon brush-09;
The structural representation of the polishing machine that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the high power density brushless electric machine that Fig. 3 provides for the embodiment of the present invention.
Wherein,
Head capsule-1, armature spindle-2, rotor core-3, stator-4, controller-5, polishing rotating disk-6, casing-7, permanent magnet-8, fan-9.
Detailed description of the invention
The invention discloses a kind of polishing machine, to improve delivery efficiency and service life, avoid environmental pollution, reduce noise and vibration, be convenient to the assembling of polishing machine.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 2, the structural representation of the polishing machine that Fig. 2 provides for the embodiment of the present invention.
Embodiments provide a kind of polishing machine, comprise casing 7 and be arranged at the head capsule 1 on casing 7 top, in head capsule 1, be provided with high power density brushless electric machine, controller 5 be arranged in casing 7; High power density brushless electric machine comprises the armature spindle 2 rotating and be arranged at head capsule 1, and armature spindle 2 and the driving shaft of the polishing rotating disk 6 of polishing machine coaxially arrange and be integral type structure; The axes normal of armature spindle 2 in polishing rotating disk 6 operating surface and through the center of circle of polishing rotating disk 6.
The polishing machine that the embodiment of the present invention provides, driving polishing rotating disk 6 to rotate by arranging high power density brushless electric machine, effectively improve the service life of device; And, owing to arranging high power density brushless electric machine, the driving shaft of armature spindle 2 with polishing rotating disk 6 is coaxially arranged, and armature spindle 2 and polishing rotating disk 6 are set to integral structure, avoid and transmission device is set in casing 7, further increase service life, further, avoid carbon dust to produce, and then avoid environmental pollution, reduce energy loss, improve delivery efficiency.Because armature spindle 2 and polishing rotating disk 6 are integral type structure, effectively prevent the engagement between travelling gear, and then reduce the noise and vibration that produce because of gear drive.And, because polishing rotating disk 6 is disk, the axes normal of armature spindle 2 in the operating surface of polishing rotating disk 6 and the axis of armature spindle 2 through the center of circle of polishing rotating disk 6, make the smooth rotation of polishing rotating disk 6, reduce the noise and vibration that produce because polishing rotating disk 6 rotates.And the controller 5 of high power density brushless electric machine is arranged in casing 7, effectively prevent controller 5 external and cause large and make unhandy situation because taking up an area space, so that the use of polishing machine, high power density brushless electric machine is arranged in head capsule 1, and controller 5 is arranged in casing 7, after high power density brushless electric machine and controller 5 are communicated to connect, again head capsule 1 and casing 7 are mounted opposite, avoid the loaded down with trivial details of travelling gear engagement installation, effectively reduce volume and the weight of polishing machine, effectively facilitate the assembling of polishing machine.
Refer to following data:
The brushless electric machine of table 1 series excited machine of the prior art and the embodiment of the present invention compare data
Further, as can be seen from table, the polishing machine in the embodiment of the present invention compared with prior art, improves delivery efficiency and the service life of motor, reduces noise.
High power density brushless electric machine in the polishing machine that the embodiment of the present invention provides is overheated and affect service life, also comprises the fan 9 be arranged on armature spindle 2.In the process that high power density brushless electric machine runs, drive fan 9 to rotate while armature spindle 2 rotates, thus heat discharging operation is carried out to high power density brushless electric machine.
In the present embodiment, fan 9 is arranged at the below of rotor core 3.Also fan 9 can be arranged at the top of rotor core 3; Or arrange the top that 9, one, two fans are positioned at rotor core 3, another is positioned at the below of rotor core 3.To introduce no longer in detail and all within protection domain at this.
Flow for the ease of air, casing 7 is provided with air inlet away from the afterbody of head capsule 1, head capsule 1 sets out air port, namely, when fan 9 is arranged at the below of rotor core 3, air outlet is arranged at head capsule 1 top, so that the air inlet of extraneous cooling air by casing 7 is sucked under the effect of fan 9, is discharged by the top of head capsule 1 after the controller 5 in casing 7 and the high power density brushless electric machine in head capsule 1 successively.The position of air inlet and air outlet is not specifically limited, only needs to guarantee that extraneous cooling air is entered by air inlet under the effect of fan 9, and discharged by air outlet after controller 5 and high power density brushless electric machine are cooled.
As shown in Figure 2, because the axes normal of armature spindle 2 is in the operating surface of polishing rotating disk 6, preferably the driving shaft of armature spindle 2 with polishing rotating disk 6 is coaxially arranged.In order to improve the connective stability of the driving shaft of armature spindle 2 and polishing rotating disk 6 and conveniently install, armature spindle 2 is integral type structure with the driving shaft of polishing rotating disk 6.Also the driving shaft of armature spindle 2 with polishing rotating disk 6 can be connected by jockeys such as shaft couplings, introduce no longer in detail at this.
In the present embodiment, high power density brushless electric machine is without Hall internal rotor high power density brushless electric machine; High power density brushless electric machine also comprises: be sheathed on the rotor core 3 outside armature spindle 2, is arranged at the stator 4 outside rotor core 3, is arranged at the permanent magnet 8 between stator 4 and rotor core 3.Also outer rotor brushless DC motor can be applied in the polishing machine that the embodiment of the present invention provides as high power density brushless electric machine.
Wherein, the permanent magnet material of preferred high magnetic as permanent magnet 8, to improve the power of high power density brushless electric machine.
Because temperature and current density are inversely proportional to, the efficiently radiates heat of stator 4 decides the power density of motor.As shown in Figure 3, stator 4 comprises stator core 41, multiple cold air duct 43 being wound in the stator enamelled wire group 42 in stator core 41 and being arranged in stator core 41.By arranging cold air duct 43, so that air flowing, effectively reduce the temperature of stator enamelled wire group 42.Due to, and then improve current density, guarantee the high power density of the high power density brushless electric machine in the present embodiment, that is, the power of the motor generation of unit volume is higher.
Cold air duct 43 is made up of the gap between adjacent two stator enamelled wire groups 42 and the gap between stator core 41 and rotor core 3.Stator enamelled wire is wound around on stator core 41, forms stator enamelled wire group 42.In winding process, there is gap between adjacent two stator enamelled wire groups 42, flow for air, and, gap between adjacent two stator enamelled wire groups 42 is communicated with the gap between stator core 41 with rotor core 3, further enhances air flowing, improves cooling effect.
As tables of data display below, with the diameter of stator 4 for 55mm-65mm, stator height is the high power density brushless electric machine of 20mm is example:
Data are compared with of the present invention in table 2 prior art
It can thus be appreciated that, the size (stator diameter and height) of the high power density brushless electric machine that the embodiment of the present invention provides all is less than the size of high power density brushless electric machine of the prior art, but, power is greater than the power of high power density brushless electric machine of the prior art, therefore, the power that the motor of its unit volume produces is higher, to ensure the high power density of the high power density brushless electric machine that the embodiment of the present invention provides.
The polishing machine that the embodiment of the present invention provides can by DC low voltage power supply or industrial frequency AC electric drive.Being connected with extraneous power frequency AC by arranging power line, running to drive high power density brushless electric machine.
What because high power density brushless electric machine is direct current generator, extraneous power frequency AC supplied is industrial-frequency alternating current.When polishing machine is connected with extraneous power supply by power line, increase and decrease is needed to be galvanic rectification and filter by AC conversion.That is, in the present embodiment, polishing machine also comprises power line for being connected with extraneous power supply and the rectification be arranged in casing 7 and filter, and wherein, rectification and filter can directly be integrated on controller 5, also can arrange separately.The industrial-frequency alternating current of extraneous power supply supply introduces polishing machine by power line, becomes direct current to the supply of high power density brushless electric machine after over commutation and filter.Wherein, rectification and filter are containing a bulky capacitor.Current conventional power frequency AC is 220-240V or 110-127V, by regulating rectification and filter to adapt to different power frequency ACs, and then expands the territory of use of the polishing machine that the embodiment of the present invention provides.
Because the current strength of extraneous power frequency AC is comparatively large, preferably, between rotor core 3 and armature spindle 2, be provided with insulating sleeve 10.
Preferably, the head capsule 1 that the embodiment of the present invention provides is plastics head capsule, with the double insulated requirement of implementation tool, further increases safety in utilization.
But because needs arrange power line, hinder the operation of polishing machine, therefore, in the present embodiment, preferably, the power supplier driving high power density brushless electric machine to run is power brick.Due to power brick supply is direct current, powers directly to high power density brushless electric machine to realize power brick.Battery pack after charging, in powering to high power density brushless electric machine, effectively prevent the operation that polishing machine is connected by power line with extraneous electric supply installation, it also avoid in operating process the situation hindering polishing machine to operate because of power line.
Further, power brick is arranged in casing 7.Effectively prevent power brick external and affect the situation that polishing machine normally uses.
Also power brick can be arranged at outside casing 7, casing 7 be provided with the interface be connected with power brick.Power brick is connected with casing 7 by interface, and makes it conduct electricity with high power density brushless electric machine to be connected.
For the ease of dismounting and the maintenance of high power density brushless electric machine, casing 7 and head capsule 1 removably connect.That is, when casing 7 is with head capsule 1 relative separation, high power density brushless electric machine is installed in head capsule 1, then controller 5 is installed in casing 7, after the line completed between controller 5 with high power density brushless electric machine is connected, casing 7 and head capsule 1 are mounted opposite.And when needs are changed or keep in repair high power density brushless electric machine, only need high power density brushless electric machine or the controller 5 that casing 7 and head capsule 1 relative separation can be keeped in repair its inside.Compared with prior art, avoid the gears meshing on the driving shaft being positioned at gear on the motor shaft of casing and head capsule, only need to meet the communication connection demand of the controller 5 in the bonding strength demand of casing 7 and head capsule 1 and casing 7 and the high power density brushless electric machine in head capsule 1, and then reduce casing 7 and the quality of fit requirement of head capsule 1, facilitate casing 7 and the processing of head capsule 1 and both being mounted opposite.
As shown in Figure 2, casing 7 with head capsule 1 for screw is connected.By evenly arranging multiple screw, to reach the bonding strength of casing 7 and head capsule 1 on casing 7 with head capsule 1.
In the present embodiment, polishing rotating disk 6 is band thread gluing base plate, emery disc or wool wheel.Also can be set to other types, introduce no longer one by one at this.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a polishing machine, comprise casing (7) and be arranged at the head capsule (1) on described casing (7) top, it is characterized in that, described head capsule is provided with high power density brushless electric machine in (1), and the controller (5) of described high power density brushless electric machine is arranged in described casing (7);
Described high power density brushless electric machine comprises the armature spindle (2) that rotation is arranged at described head capsule (1), and described armature spindle (2) and the driving shaft of the polishing rotating disk (6) of described polishing machine coaxially arrange and be integral type structure;
The axes normal of described armature spindle (2) in described polishing rotating disk (6) operating surface and through the center of circle of described polishing rotating disk (6).
2. polishing machine as claimed in claim 1, is characterized in that, also comprise the fan (9) be arranged on described armature spindle (2).
3. polishing machine as claimed in claim 2, it is characterized in that, described fan (9) is arranged at the below of described rotor core (3); Or described fan (9) is arranged at the top of described rotor core (3); Or the quantity of described fan (9) is two, a top being positioned at described rotor core (3), another is positioned at the below of described rotor core (3).
4. polishing machine as claimed in claim 1, it is characterized in that, described high power density brushless electric machine is without Hall internal rotor high power density brushless electric machine;
Described high power density brushless electric machine also comprises: the rotor core (3) being sheathed on described armature spindle (2) outside, be arranged at the stator (4) in described rotor core (3) outside, be arranged at the permanent magnet (8) between described stator (4) and described rotor core (3).
5. polishing machine as claimed in claim 4, it is characterized in that, described stator (4) comprises stator core (41), multiple cold air duct (43) being wound in the stator enamelled wire group (42) in described stator core (41) and being arranged in described stator core (41).
6. polishing machine as claimed in claim 5, it is characterized in that, described cold air duct (43) is made up of the gap between adjacent two described stator enamelled wire groups (42) and the gap between described stator core (41) and described rotor core (3).
7. polishing machine as claimed in claim 1, is characterized in that, also comprises the power line for being connected with extraneous power frequency AC and the rectification be arranged in described casing (7) and filter;
Insulating sleeve (10) is provided with between described rotor core (3) and described armature spindle (2).
8. polishing machine as claimed in claim 7, it is characterized in that, described head capsule (1) is plastics head capsule.
9. polishing machine as claimed in claim 1, it is characterized in that, the power supplier driving described high power density brushless electric machine to run is power brick.
10. polishing machine as claimed in claim 9, it is characterized in that, described power brick is arranged in described casing (7), or, described power brick is arranged at described casing (7) outward, described casing (7) is provided with the interface be connected with described power brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410242478.5A CN105215951A (en) | 2014-05-30 | 2014-05-30 | Polishing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410242478.5A CN105215951A (en) | 2014-05-30 | 2014-05-30 | Polishing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105215951A true CN105215951A (en) | 2016-01-06 |
Family
ID=54985394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410242478.5A Pending CN105215951A (en) | 2014-05-30 | 2014-05-30 | Polishing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105215951A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD887806S1 (en) | 2018-04-03 | 2020-06-23 | Milwaukee Electric Tool Corporation | Jigsaw |
| US10835972B2 (en) | 2018-03-16 | 2020-11-17 | Milwaukee Electric Tool Corporation | Blade clamp for power tool |
| CN112077799A (en) * | 2019-06-14 | 2020-12-15 | 南京德朔实业有限公司 | Electric tool |
| US11014176B2 (en) | 2018-04-03 | 2021-05-25 | Milwaukee Electric Tool Corporation | Jigsaw |
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| CN2218625Y (en) * | 1995-05-29 | 1996-01-31 | 浙江永康恒丰电器制造公司 | Disc sand polishing machine |
| CN202399103U (en) * | 2011-12-14 | 2012-08-29 | 江苏金鼎电动工具集团有限公司 | Sanding machine |
| TW201307014A (en) * | 2011-08-02 | 2013-02-16 | X Pole Prec Tools Inc | Hand-held machine tool for improving output efficiency |
| CN103326528A (en) * | 2013-07-02 | 2013-09-25 | 金王迅 | Electromagnetic compatibility (EMC) triple-insulated anti-interference high-voltage permanent magnet brushless electric tool |
| CN203843806U (en) * | 2014-05-30 | 2014-09-24 | 浙江绿动电机科技有限公司 | Polishing machine |
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2014
- 2014-05-30 CN CN201410242478.5A patent/CN105215951A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2218625Y (en) * | 1995-05-29 | 1996-01-31 | 浙江永康恒丰电器制造公司 | Disc sand polishing machine |
| TW201307014A (en) * | 2011-08-02 | 2013-02-16 | X Pole Prec Tools Inc | Hand-held machine tool for improving output efficiency |
| CN202399103U (en) * | 2011-12-14 | 2012-08-29 | 江苏金鼎电动工具集团有限公司 | Sanding machine |
| CN103326528A (en) * | 2013-07-02 | 2013-09-25 | 金王迅 | Electromagnetic compatibility (EMC) triple-insulated anti-interference high-voltage permanent magnet brushless electric tool |
| CN203843806U (en) * | 2014-05-30 | 2014-09-24 | 浙江绿动电机科技有限公司 | Polishing machine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10835972B2 (en) | 2018-03-16 | 2020-11-17 | Milwaukee Electric Tool Corporation | Blade clamp for power tool |
| USD887806S1 (en) | 2018-04-03 | 2020-06-23 | Milwaukee Electric Tool Corporation | Jigsaw |
| US11014176B2 (en) | 2018-04-03 | 2021-05-25 | Milwaukee Electric Tool Corporation | Jigsaw |
| US11813682B2 (en) | 2018-04-03 | 2023-11-14 | Milwaukee Electric Tool Corporation | Jigsaw |
| CN112077799A (en) * | 2019-06-14 | 2020-12-15 | 南京德朔实业有限公司 | Electric tool |
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Application publication date: 20160106 |
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