CN110635369B - Power box capable of being locked automatically - Google Patents
Power box capable of being locked automatically Download PDFInfo
- Publication number
- CN110635369B CN110635369B CN201910780659.6A CN201910780659A CN110635369B CN 110635369 B CN110635369 B CN 110635369B CN 201910780659 A CN201910780659 A CN 201910780659A CN 110635369 B CN110635369 B CN 110635369B
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- China
- Prior art keywords
- power box
- electric control
- locking mechanism
- electric
- hydraulic cylinder
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
- E05B47/0002—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/02—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means
- E05B47/023—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means the bolt moving pivotally or rotatively
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B65/00—Locks or fastenings for special use
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/46—Boxes; Parts thereof or accessories therefor
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Casings For Electric Apparatus (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
The invention discloses an automatic-locking power box which structurally comprises a power box body, heat dissipation holes, an opening and closing box door and an electric control automatic locking device, wherein the power box body is of a rectangular structure, and the heat dissipation holes are formed in two sides of the power box body and are of an integrated forming structure. According to the invention, through the arranged electric control automatic locking device, when workers enter the box body for maintenance, the box door is automatically pushed up in time, so that external water vapor and dust are prevented from entering the power box, internal parts are protected, and the situation that the workers forget to lock the box door and other people carelessly enter the power box in the later period are prevented, the power box is protected, and meanwhile, potential safety hazards to other people are avoided.
Description
Technical Field
The invention relates to the field of power boxes, in particular to a power box capable of being automatically locked.
Background
The power box is used for loading articles such as instruments, electronics, communication, automation, sensors, smart cards, industrial control and precision machinery, and the material is mostly high-quality aluminum alloy section bar, and the aluminum alloy section bar has characteristics such as solid in structure, pleasing to the eye appearance, good heat dispersion, but, prior art's power box has following defect:
the power box of prior art all is equipped with the chamber door that can supply the staff to come in and go out and carry out inspection, maintenance, often appears the inspection, the maintenance, and the condition of chamber door is not in time closed after the staff gets into, leads to moisture, dust to fly into the power box in, causes certain damage to its inside spare part, but also can appear the inspection, forget to close the chamber door after the maintenance finishes, in other personnel carelessly get into the power box after the circular telegram, danger probably appears.
Disclosure of Invention
The invention aims to provide an automatic-locking power box, which aims to solve the defects that in the prior art, all power boxes are provided with box doors for workers to go in and out for inspection and maintenance, inspection and maintenance often occur, the box doors are not closed in time after the workers enter, moisture and dust fly into the power box, certain damage is caused to internal parts of the power box, the box doors are forgotten to be closed after the inspection and maintenance are finished, and other personnel carelessly enter the power box after the power is switched on, and danger is possibly caused.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the electric box capable of being automatically locked structurally comprises an electric box body, heat dissipation holes, an opening and closing box door and an electric control automatic locking device, wherein the electric box body is of a rectangular structure, the heat dissipation holes are formed in two sides of the electric box body and are of an integrally formed structure, the opening and closing box door is arranged in the front of the electric box body and is movably connected through a hinge, and the electric control automatic locking device is arranged on the rear surface of the opening and closing box door;
the automatic electric control locking device is composed of an automatic closing mechanism, an electromagnetic block, a magnetic mechanism, an electric control locking mechanism and a double locking mechanism, wherein the automatic closing mechanism is arranged behind the opening and closing box door and is connected with the opening and closing box door through electric welding, the electromagnetic block is arranged on the side of the magnetic mechanism, the electric control locking mechanism is arranged on the edge of the opening and closing box door away from the hinge, the magnetic mechanism is meshed with the electric control locking mechanism and is connected with the double locking mechanism, and the double locking mechanism is arranged between the magnetic mechanism and the electric control locking mechanism and is connected with the double locking mechanism.
As a further scheme of the invention, the automatic closing mechanism comprises a hinge seat, a buffer hydraulic cylinder, a piston rod, a meshing ball and a welding seat, wherein the hinge seat is arranged on the inner wall of the electric box body on the left side of the opening and closing box door, one end of the buffer hydraulic cylinder is movably connected with the hinge seat, one end of the piston rod is in over fit with the other end of the buffer hydraulic cylinder, and the other end of the piston rod is movably connected with the welding seat through the meshing ball.
As a further scheme of the invention, the buffer hydraulic cylinder consists of a hydraulic cylinder, a buffer block and a compression spring, wherein the buffer block is arranged on the inner wall of one end of the hydraulic cylinder, which is close to the piston rod, and the compression spring is arranged in the hydraulic cylinder and welded with the piston rod.
The magnetic driving mechanism comprises a rotating ring, an iron block, a synchronous belt and a jacking ball, wherein the rotating ring is arranged on the right side of the electromagnetic block, the iron block and the jacking ball are respectively arranged above and below the rotating ring, one end of the synchronous belt is meshed with the rotating ring, and the other end of the synchronous belt is meshed with the electric control locking mechanism.
The electric control locking mechanism is composed of a clamping plate, a slider, a slide rail and a central shaft, wherein the slider is arranged on the rear surface of the clamping plate and is connected with the slide rail in a sliding manner, and the central shaft is arranged in the center of the clamping plate and is connected with the rotating ring through a synchronous belt.
As a further scheme of the invention, the clamping plate is oval, and the focuses of the rear surface of the clamping plate are provided with sliders.
In a further aspect of the present invention, the dual locking mechanism includes a dual locking plate, a sliding pushing member, a sliding pushing groove, and a push rod, the sliding pushing member is disposed in the middle of the rear portion of the dual locking plate, the sliding pushing member is slidably engaged with the sliding pushing groove, and the push rod is disposed at the left side of the dual locking plate.
As a further scheme of the invention, the double clamping plate is arc-shaped, and the inner arc of the double clamping plate is the same as the clamping end of the clamping plate.
Advantageous effects of the invention
Compared with the traditional power box, the electric control automatic locking device has the advantages that the box door can be automatically pushed up in time when workers enter the box body for maintenance through the electric control automatic locking device, external water vapor and dust are prevented from entering the power box, internal parts are protected, the box door can be locked when the power box is electrified and normally supplies power after maintenance is finished, the workers are prevented from forgetting to lock, other workers cannot enter the power box carelessly in the later period, the power box is protected, and potential safety hazards to other workers are avoided.
Drawings
Other features, objects and advantages of the invention will become more apparent from a reading of the detailed description of non-limiting embodiments with reference to the attached drawings.
In the drawings:
fig. 1 is a schematic structural diagram of an automatically lockable power box according to the present invention.
Fig. 2 is a plan view of an electric control automatic locking device of an electric power box capable of being automatically locked according to the present invention.
Fig. 3 is a structural state diagram of an electric control automatic locking device of an electric power box capable of being automatically locked according to the present invention.
Fig. 4 is a plan view of an electric control locking mechanism of an automatic locking power box according to the present invention.
Fig. 5 is a top view of an electric control automatic locking device of an automatic lockable power box according to the present invention.
In the figure: the automatic locking device comprises a power box body 1, heat dissipation holes 2, an opening and closing box door 3, an electric control automatic locking device 4, an automatic closing mechanism a, an electromagnetic block b, a magnetic mechanism c, an electric control locking mechanism d, a double locking mechanism e, a hinge seat aa, a buffer hydraulic cylinder ab, a piston rod ac, a meshing ball ad, a welding seat ae, a hydraulic cylinder ab1, a buffer block ab2, a compression spring ab3, a rotating ring ca, an iron block cb, a synchronous belt cc, a jacking ball cd, a clamping plate da, a db slider, a sliding rail dc, a central shaft dd, a double clamping plate ea, a pushing slider eb, a pushing slider ec and a jacking rod ed.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, the present invention provides a technical solution of an automatically lockable power box:
an electric power box capable of being automatically locked structurally comprises an electric power box body 1, heat dissipation holes 2, an opening and closing box door 3 and an electric control automatic locking device 4, wherein the electric power box body 1 is of a rectangular structure, the heat dissipation holes 2 are formed in two sides of the electric power box body 1 and are of an integrally formed structure, the opening and closing box door 3 is arranged in the front of the electric power box body 1 and is movably connected through hinges, and the electric control automatic locking device 4 is arranged on the rear surface of the opening and closing box door 3;
the electric control automatic locking device 4 is composed of an automatic closing mechanism a, an electromagnetic block b, a magnetic mechanism c, an electric control locking mechanism d and a double locking mechanism e, wherein the automatic closing mechanism a is arranged behind the opening and closing door 3 and is connected through electric welding, the electromagnetic block b is arranged on the side of the magnetic mechanism c, the electric control locking mechanism d is arranged on the edge of the opening and closing door 3 away from a hinge, the magnetic mechanism c is meshed with the electric control locking mechanism d and is connected, and the double locking mechanism e is arranged between the magnetic mechanism c and the electric control locking mechanism d and is connected through meshing.
The automatic closing mechanism a comprises a hinge seat aa, a buffer hydraulic cylinder ab, a piston rod ac, a meshing ball ad and a welding seat ae, the hinge seat aa is arranged on the inner wall of the power box body 1 on the left side of the opening and closing box door 3, one end of the buffer hydraulic cylinder ab is movably connected with the hinge seat aa, one end of the piston rod ac is in excessive fit with the other end of the buffer hydraulic cylinder ab, and the other end of the piston rod ac is movably connected with the welding seat ae through the meshing ball ad.
The buffer hydraulic cylinder ab is composed of a hydraulic cylinder ab1, a buffer block ab2 and a compression spring ab3, the buffer block ab2 is arranged on the inner wall of one end, close to the piston rod ac, of the hydraulic cylinder ab1, and the compression spring ab3 is arranged inside the hydraulic cylinder ab1 and welded with the piston rod ac.
The magnetic power mechanism c is composed of a rotating ring ca, an iron block cb, a synchronous belt cc and a top ball cd, the rotating ring ca is arranged on the right side of the electromagnetic block b, the iron block cb and the top ball cd are respectively arranged above and below the rotating ring ca, one end of the synchronous belt cc is meshed with the rotating ring ca, and the other end of the synchronous belt cc is meshed with the electric control locking mechanism d.
The electric control locking mechanism d comprises a clamping plate da, a slider db, a sliding rail dc and a central shaft dd, wherein the slider db is arranged on the rear surface of the clamping plate da and is in sliding connection with the sliding rail dc, and the central shaft dd is arranged in the center of the clamping plate da and is connected with a rotating ring ca through a synchronous belt cc.
The clamping plates da are in an oval shape, and sliders db are arranged at the focal points of the rear surfaces of the clamping plates da.
The dual locking mechanism e comprises a dual clamping plate ea, a sliding piece eb, a sliding groove ec and a push rod ed, the sliding piece eb is arranged in the middle of the rear portion of the dual clamping plate ea, the sliding piece eb is clamped in the sliding groove ec and is in sliding connection with the sliding groove ec, and the push rod ed is arranged on the left side of the dual clamping plate ea.
The double clamping plate ea is arc-shaped, and the inner arc of the double clamping plate ea is the same as the clamping end of the clamping plate da.
The working principle of the invention is as follows: when the electric box has a fault or needs to be checked at regular time, firstly, a circuit of the electric box is disconnected, the opening and closing box door 3 is pushed inwards, after a worker enters the electric box body 1, the piston rod ac is pushed out of the buffer hydraulic cylinder ab under the action of elastic potential energy of the compression spring ab3, and then the opening and closing box door 3 is pushed and closed through the meshing ball ad and the welding seat ae; at the inspection, after maintenance work, the staff leaves power box 1, 3 automatic in time closes of the chamber door that opens and shuts with the principle, when the switch-on circuit carried out normal power supply again, electromagnetism piece b also circular telegram produced magnetism, thereby attract iron plate cb to drive rotatory ring ca and be anticlockwise rotation, rethread hold-in range cc drives cardboard da and is 90 degrees of anticlockwise rotation, it stretches out 3 cards of chamber door that opens and shuts to be oval-shaped cardboard da other end rotation, when rotatory ring ca was anticlockwise rotation simultaneously, lie in the top ball cd of below rotatory right and promote dual cardboard ea through ejector pin ed and slide right along pushing away spout ec under the cooperation that pushes away slide eb, and block cardboard da, realize dual locking.
The invention solves the problems that the prior electric power boxes are all provided with box doors which can be used for the access of working personnel for inspection and maintenance, the inspection and maintenance often occur, the condition that the box doors are not closed in time after the working personnel enter the electric power boxes, so that moisture and dust fly into the electric power boxes, certain damage is caused to the internal parts of the electric power boxes, the box doors are forgotten to be closed after the inspection and maintenance are finished, and other personnel carelessly enter the electric power boxes after the electrification and danger is possibly caused. Prevent that the staff from forgetting to lock, the condition of other personnel in later stage carelessly entering the inside of power box takes place, protection power box avoids having the potential safety hazard to other personnel simultaneously.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (1)
1. The utility model provides a but electric power box of automatic locking, its structure includes electric power box (1), louvre (2), door (3) that opens and shuts, automatically controlled automatic locking device (4), its characterized in that: the electric power box body (1) is of a rectangular structure, the heat dissipation holes (2) are formed in two sides of the electric power box body (1) and are of an integrated forming structure, the opening and closing box door (3) is arranged in the front of the electric power box body (1) and is movably connected through a hinge, and the electric control automatic locking device (4) is arranged on the rear surface of the opening and closing box door (3);
the electric control automatic locking device (4) comprises an automatic closing mechanism (a), an electromagnetic block (b), a magnetic mechanism (c), an electric control locking mechanism (d) and a double locking mechanism (e), wherein the automatic closing mechanism (a) is arranged behind the opening and closing box door (3) and is connected with the opening and closing box door through electric welding, the electromagnetic block (b) is arranged on the side of the magnetic mechanism (c), the electric control locking mechanism (d) is arranged on the edge of the opening and closing box door (3) far away from the hinge, the magnetic mechanism (c) is meshed with the electric control locking mechanism (d), the double locking mechanism (e) is arranged between the magnetic mechanism (c) and the electric control locking mechanism (d) and is connected with the electric control locking mechanism (d) through meshing, the automatic closing mechanism (a) comprises a hinge seat (aa), a buffer hydraulic cylinder (ab), a piston rod (ac), a meshing ball (ad) and a welding seat (ae), the hinge seat (aa) is arranged on the inner wall of a power box body (1, one end of the buffer hydraulic cylinder (ab) is movably connected with the hinge seat (aa), one end of the piston rod (ac) is in excessive fit with the other end of the buffer hydraulic cylinder (ab), and the other end of the piston rod (ac) is movably connected with the welding seat (ae) through a meshing ball (ad);
the buffer hydraulic cylinder (ab) consists of a hydraulic cylinder (ab1), a buffer block (ab2) and a compression spring (ab3), the buffer block (ab2) is arranged on the inner wall of one end, close to the piston rod (ac), of the hydraulic cylinder (ab1), and the compression spring (ab3) is arranged inside the hydraulic cylinder (ab1) and welded with the piston rod (ac);
the magnetic mechanism (c) consists of a rotating ring (ca), an iron block (cb), a synchronous belt (cc) and a jacking ball (cd), the rotating ring (ca) is arranged on the right side of the electromagnetic block (b), the iron block (cb) and the jacking ball (cd) are respectively arranged above and below the rotating ring (ca), one end of the synchronous belt (cc) is meshed with the rotating ring (ca), and the other end of the synchronous belt (cc) is meshed with an electric control locking mechanism (d);
the electric control locking mechanism (d) consists of a clamping plate (da), a slider (db), a sliding rail (dc) and a central shaft (dd), wherein the slider (db) is arranged on the rear surface of the clamping plate (da) and is in sliding connection with the sliding rail (dc), and the central shaft (dd) is arranged in the center of the clamping plate (da) and is connected with a rotating ring (ca) through a synchronous belt (cc);
the double locking mechanism (e) consists of a double clamping plate (ea), a sliding piece (eb), a sliding groove (ec) and a push rod (ed), wherein the sliding piece (eb) is arranged in the middle of the rear part of the double clamping plate (ea), the sliding piece (eb) is clamped in the sliding groove (ec) and is in sliding connection with the sliding groove (ec), and the push rod (ed) is arranged on the left side of the double clamping plate (ea);
when the electric box breaks down or needs to be checked at regular time, firstly, a circuit of the electric box is disconnected, the opening and closing box door (3) is pushed inwards, after a worker enters the electric box body (1), the piston rod (ac) is pushed out of the buffering hydraulic cylinder (ab) under the action of elastic potential energy of the compression spring (ab3), and then the opening and closing box door (3) is pushed and closed through the meshing ball (ad) and the welding seat (ae); at the inspection, after maintenance work, the staff leaves power box (1), open and shut chamber door (3) automatic in time to close with the same reason, when switch-on circuit carried out normal power supply again, electromagnetism piece (b) also circular telegram produced magnetism, thereby attract iron plate (cb) to drive rotatory ring (ca) and be anticlockwise rotation, rethread hold-in range (cc) drives cardboard (da) and is anticlockwise rotation 90 degrees, it stretches out open and shut chamber door (3) card on power box (1) to be oval-shaped cardboard (da) other end rotation, when rotatory ring (ca) is anticlockwise rotation simultaneously, lie in the top ball (cd) rotation of below and promote dual cardboard ea through ejector pin (ed) and slide right along pushing away spout (ec) under the cooperation that pushes away slide (eb), and block cardboard (da), realize dual locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780659.6A CN110635369B (en) | 2019-08-22 | 2019-08-22 | Power box capable of being locked automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780659.6A CN110635369B (en) | 2019-08-22 | 2019-08-22 | Power box capable of being locked automatically |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110635369A CN110635369A (en) | 2019-12-31 |
| CN110635369B true CN110635369B (en) | 2020-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910780659.6A Active CN110635369B (en) | 2019-08-22 | 2019-08-22 | Power box capable of being locked automatically |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110635369B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201420447Y (en) * | 2009-05-22 | 2010-03-10 | 王日滨 | Lock of cabinet door |
| CN104701766A (en) * | 2015-01-30 | 2015-06-10 | 日升集团有限公司 | Prefabricated power transformation box with automatic opening and shutting door |
| CN205777943U (en) * | 2016-05-06 | 2016-12-07 | 董自强 | A kind of electric cubicle switchboard cupboard door smart lock aperture apparatus |
| CN106877202A (en) * | 2017-03-21 | 2017-06-20 | 合肥华兴电器开关有限公司 | A kind of automatic lock gate closure type safety distribution control box |
| CN109098563A (en) * | 2018-09-14 | 2018-12-28 | 漯河市宏力电器有限公司 | A kind of self-locking gear of batch meter |
| CN110071436A (en) * | 2019-05-29 | 2019-07-30 | 江苏隆鑫电气设备有限公司 | A kind of Intelligent joint lock switchgear |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10316522B3 (en) * | 2003-04-10 | 2004-07-08 | Seccor High Security Gmbh | Automatic resetting system for electronic locking system used with panic lock for access door has eccentric core supported by spring-loaded ball bearing defining rest position of locking cam axis |
| CN202181767U (en) * | 2011-06-29 | 2012-04-04 | 四川盛堡机电科技有限责任公司 | Electronic lock |
-
2019
- 2019-08-22 CN CN201910780659.6A patent/CN110635369B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201420447Y (en) * | 2009-05-22 | 2010-03-10 | 王日滨 | Lock of cabinet door |
| CN104701766A (en) * | 2015-01-30 | 2015-06-10 | 日升集团有限公司 | Prefabricated power transformation box with automatic opening and shutting door |
| CN205777943U (en) * | 2016-05-06 | 2016-12-07 | 董自强 | A kind of electric cubicle switchboard cupboard door smart lock aperture apparatus |
| CN106877202A (en) * | 2017-03-21 | 2017-06-20 | 合肥华兴电器开关有限公司 | A kind of automatic lock gate closure type safety distribution control box |
| CN109098563A (en) * | 2018-09-14 | 2018-12-28 | 漯河市宏力电器有限公司 | A kind of self-locking gear of batch meter |
| CN110071436A (en) * | 2019-05-29 | 2019-07-30 | 江苏隆鑫电气设备有限公司 | A kind of Intelligent joint lock switchgear |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110635369A (en) | 2019-12-31 |
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Effective date of registration: 20201124 Address after: 472000 first floor, Huayang company, Sanmenxia Industrial Park, Sanmenxia City, Henan Province Applicant after: Datang Sanmenxia Electric Power Co.,Ltd. Address before: 362300 Block 8, Jinxia Huayuan B, Zhenfu Road, Xiamei Town, Nanan City, Quanzhou City, Fujian Province Applicant before: NAN'AN QUANYIN MACHINERY TECHNOLOGY Co.,Ltd. |
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