CN109202527B - Quick cutting of machining prevents cold mechanism of patrolling of high temperature spark - Google Patents
Quick cutting of machining prevents cold mechanism of patrolling of high temperature spark Download PDFInfo
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- CN109202527B CN109202527B CN201811218106.3A CN201811218106A CN109202527B CN 109202527 B CN109202527 B CN 109202527B CN 201811218106 A CN201811218106 A CN 201811218106A CN 109202527 B CN109202527 B CN 109202527B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
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Abstract
The invention relates to a quick cutting and high-temperature spark prevention cold patrol mechanism for machining, which comprises a main body, a main pipeline and a temperature sensor, wherein a water tank is arranged at the top of the main body, a water pump is arranged on the inner side of the water tank, the main pipeline is connected to the bottom end of the water pump, a connector is arranged at the bottom of the main pipeline, an auxiliary pipeline is arranged on the outer side of the connector, a hydraulic rod is installed on the inner wall of the top end of the main body, and a bearing is arranged at the bottom of the hydraulic rod. The invention has the beneficial effects that: according to the invention, through the arrangement of the temperature sensors, the water tank, the main body, the water pump, the main pipeline, the auxiliary pipeline and the connectors, the temperature sensors are oppositely distributed on the inner wall of the main body, and the temperature sensors are electrically connected in parallel, and the inspection operation can be carried out on the cold and hot degree of the device in a working state under the action of the temperature sensors, so that a worker can timely know the cold and hot conditions at the inner side of the device, and the phenomenon of high-temperature sparks is prevented.
Description
Technical Field
The invention relates to the technical field of machining cutting cold inspection mechanisms, in particular to a cold inspection mechanism for preventing high-temperature sparks in machining rapid cutting.
Background
With the development of science and technology and the progress of the social era, mechanical processing is the most important process in the mechanical manufacturing industry, and the types of mechanical processing are very many, for example: cutting, grinding, polishing, welding etc. a series, and need carry out the cold and hot temperature induction operation to it through patrolling cold mechanism to mechanical device in the cutting process for mechanical equipment's working effect is excellent.
The cold mechanism of patrolling of current cutting process in the use, the patrolling effect is not good, brings inconvenience for machining work to the cutting work of device is single, and the limitation is big, makes the speed of device cutting work slow down.
Disclosure of Invention
The invention aims to provide a cold patrol mechanism for quick cutting and preventing high-temperature sparks in machining, and aims to solve the problems that the prior cold patrol mechanism for cutting machining, which is proposed in the background art, has poor patrol effect and brings inconvenience to the machining work in the use process, and the cutting work of the device is single and has large limitation, so that the cutting work speed of the device is reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a cold inspection mechanism for preventing high-temperature sparks during machining and rapid cutting comprises a main body, a main pipeline and a temperature sensor, wherein a water tank is arranged at the top of the main body, and the inner side of the water tank is provided with a water pump, the main pipeline is connected with the bottom end of the water pump, the bottom of the main pipeline is provided with a connector, an auxiliary pipeline is arranged on the outer side of the connector, a hydraulic rod is arranged on the inner wall of the top end of the main body, the bottom of the hydraulic rod is provided with a bearing, the inner side of the bearing is movably penetrated with a rotating shaft, the outer wall of the rotating shaft is connected with a blade, the outer side of the main body is provided with an operating box, and a telescopic rod is arranged in the main body, a movable plate is arranged at the top end of the telescopic rod, the movable plate is connected with the telescopic rod through a second connecting shaft, and a substrate is arranged on the inner side of the movable plate close to the main body and connected with the movable plate through a first connecting shaft.
Preferably, the water tank is fixedly connected with the main body, the central axis of the water tank coincides with the central axis of the main body, the temperature sensor is arranged on the inner wall of the main body, and a fixing groove is fixed in the inner wall of the main body.
Preferably, be threaded connection between connector and trunk line, the auxiliary line, and the inboard width of trunk line is greater than the inboard width of auxiliary line.
Preferably, the hydraulic stem is vertically distributed with the top inner wall of the main body, the hydraulic stem is symmetrical about the central axis of the main body, a door spindle is arranged on the outer side of the main body, a movable door is movably arranged on the outer wall of the door spindle, and an observation window is arranged on the inner side of the movable door.
Preferably, the telescopic rod and the movable plate form a movable structure through a second connecting shaft, the movable plate and the substrate are equal in thickness, a first fixing strip is arranged at the top of the substrate, a bolt penetrates through the inner side of the first fixing strip, a movable strip is arranged at one end, away from the first fixing strip, of the bolt, a frame is arranged on the inner side of the substrate, a limiting groove is fixed inside the substrate, and a second fixing strip is arranged at the top end of the substrate.
Preferably, the length of the observation window is equal to the width of the movable door, and the observation window is distributed on the inner side of the movable door in a rectangular shape.
Preferably, the frame is fixedly connected with the substrate, and the substrate is matched with the movable plate in shape.
Preferably, sliding connection is adopted between the movable strip and the limiting groove, and the lengths of the movable strip, the first fixed strip and the second fixed strip are equal.
Preferably, the inner wall of the fixing groove is attached to the outer side of the rotating shaft, and the circle center of the circle where the section of the rotating shaft is located on the central axis of the fixing groove.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can carry out patrol operation on the cold and hot degrees of the device in a working state through the effect of the temperature sensors which are oppositely distributed on the inner wall of the main body by arranging the temperature sensors, the water tank, the main body, the water pump, the main pipeline, the auxiliary pipeline and the connector, so that a worker can timely know the cold and hot conditions of the inner side of the device and prevent the generation of high-temperature spark phenomenon, the water tank is fixedly connected with the main body, the connectivity between the water tank and the main body can be enhanced, when the inner side of the device has overheating phenomenon, the water pump at the inner side of the water tank is started, so that water flow is sprayed along the main pipeline and the auxiliary pipeline to realize the purpose of rapid cooling, the connector is in threaded connection with the main pipeline and the auxiliary pipeline, when the water flow is output operation along the main pipeline and the auxiliary pipeline, under the effect of connector, can strengthen the leakproofness between trunk line and the auxiliary line way, prevent that rivers from overflowing, cause the water waste.
2. The invention sets the hydraulic rod, the main body, the telescopic rod, the second connecting shaft and the movable plate, the hydraulic rod is vertically distributed with the inner wall of the top end of the main body, before the device carries out quick cutting work on mechanical parts, the hydraulic rod is started, the bearing drives the rotating shaft to move downwards, the blade is moved to the parts to be processed, the cutting work of the device is ensured to be finished in the most excellent state, meanwhile, the telescopic rod and the movable plate form a movable structure through the second connecting shaft, when the device carries out cutting work on the parts, the device needs to be arranged and operated, the movable plate is rotated under the extension action of the movable plate through the rotation action of the second connecting shaft by starting the telescopic rod, the inclination angle of the parts can be adjusted, and the device can conveniently carry out cutting work on the parts with different angles, the flexibility of the device is improved.
3. According to the invention, through the arrangement of the observation window, the movable door, the frame and the substrate, the observation window is distributed on the inner side of the movable door in a rectangular shape, the working state of the running part on the inner side of the device can be observed under the action of the observation window, the change of the part in the cutting process can be recorded, the frame is fixedly connected with the substrate, the connectivity between the frame and the substrate can be enhanced under the connecting action of the frame and the substrate, and the scraps generated in the cutting process can slide to the bottom of the device under the action of the frame, so that the later concentrated cleaning operation is facilitated.
4. According to the invention, through the arrangement of the movable strip, the limiting groove, the bolt and the first fixing strip, the movable strip is in sliding connection with the limiting groove, when the base plate is used for placing parts, the parts are clamped under the action of the movable strip and the second fixing strip, the bolt is screwed, so that the movable strip moves along the inner side of the limiting groove through the movable block at the bottom of the movable strip, and the clamping force of the device on the parts can be increased.
5. According to the invention, through the arrangement of the rotating shaft, the fixing groove and the main body, and the circle center of the circle of the section of the rotating shaft is positioned on the central axis of the fixing groove, when the rotating shaft moves downwards, the rotating shaft is not easy to rotate left and right under the distribution action of the fixing groove and the rotating shaft, so that the phenomenon of deformation between the main body and the operation box and the damage to the device are avoided.
Drawings
FIG. 1 is a schematic structural diagram of a cooling mechanism for machining and rapid cutting to prevent high-temperature sparks according to the present invention;
FIG. 2 is a schematic structural diagram of the outer side of the main body of the cooling inspection mechanism for machining and rapid cutting to prevent high-temperature sparks according to the invention;
FIG. 3 is a schematic diagram of the structure of the inner side of the top of the substrate of the cooling mechanism for machining and rapid cutting to prevent high-temperature sparks according to the present invention;
FIG. 4 is a schematic structural diagram of the inner wall of the main body of the cooling mechanism for machining and rapid cutting to prevent high-temperature sparks;
FIG. 5 is an enlarged schematic structural diagram of the part A of the cooling inspection mechanism for preventing high-temperature sparks in machining and rapid cutting according to the invention.
In the figure: 1. a main body; 2. a water tank; 3. a water pump; 4. a main pipeline; 5. a connector; 6. a secondary pipe; 7. a hydraulic lever; 8. a bearing; 9. a rotating shaft; 10. a blade; 11. an operation box; 12. a movable plate; 13. a telescopic rod; 14. a substrate; 15. a first fixing strip; 16. a movable door; 17. a door shaft; 18. an observation window; 19. a frame; 20. a second fixing strip; 21. a limiting groove; 22. a movable bar; 23. a bolt; 24. a temperature sensor; 25. fixing grooves; 26. a first connecting shaft; 27. and a second connecting shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: a quick cutting and high temperature spark prevention cooling mechanism for machining comprises a main body 1, a water tank 2, a water pump 3, a main pipeline 4, a connector 5, an auxiliary pipeline 6, a hydraulic rod 7, a bearing 8, a rotating shaft 9, a blade 10, an operation box 11, a movable plate 12, a telescopic rod 13, a base plate 14, a first fixing strip 15, a movable door 16, a door shaft 17, an observation window 18, a frame 19, a second fixing strip 20, a limiting groove 21, a movable strip 22, a bolt 23, a temperature sensor 24, a fixing groove 25, a first connecting shaft 26 and a second connecting shaft 27, wherein the water tank 2 is arranged at the top of the main body 1, the water pump 3 is arranged on the inner side of the water tank 2, the water tank 2 is fixedly connected with the main body 1, the central axis of the water tank 2 coincides with the central axis of the main body 1, the connectivity between the water tank 2 and the main body 1 can be enhanced, and when the inner side of the device has an overheating, the water flow is sprayed along the main pipeline 4 and the auxiliary pipeline 6, so that the aim of quickly cooling is fulfilled;
the temperature sensor 24 is arranged on the inner wall of the main body 1, a fixing groove 25 is fixed inside the inner wall of the main body 1, the inner wall of the fixing groove 25 is attached to the outer side of the rotating shaft 9, the circle center of a circle where the cross section of the rotating shaft 9 is located on the central axis of the fixing groove 25, when the rotating shaft 9 moves downwards, left-right rotation operation of the rotating shaft 9 is not easy to occur under the distribution effect of the fixing groove 25 and the rotating shaft 9, deformation between the main body 1 and the operation box 11 is avoided, the device is damaged, the main pipeline 4 is connected to the bottom end of the water pump 3, the connector 5 is arranged at the bottom of the main pipeline 4, the connector 5 is in threaded connection with the main pipeline 4 and the auxiliary pipeline 6, the inner side width of the main pipeline 4 is larger than that of the auxiliary pipeline 6, when water flow is output along the main pipeline 4 and the auxiliary pipeline 6, the sealing performance between the main pipeline 4 and, the water flow is prevented from overflowing, so that the waste of water resources is avoided;
the outer side of the connector 5 is provided with an auxiliary pipeline 6, the top end inner wall of the main body 1 is provided with a hydraulic rod 7, the bottom of the hydraulic rod 7 is provided with a bearing 8, the hydraulic rod 7 and the top end inner wall of the main body 1 are vertically distributed, the hydraulic rod 7 is symmetrical about the central axis of the main body 1, before the device carries out quick cutting work on mechanical parts, the hydraulic rod 7 is started, the bearing 8 drives a rotating shaft 9 to move downwards, a blade 10 is moved to the parts to be processed, the device is ensured to be in the most excellent state to complete the cutting work, the outer side of the main body 1 is provided with a door shaft 17, the outer wall of the door shaft 17 is movably provided with a movable door 16, the inner side of the movable door 16 is provided with an observation window 18, the length of the observation window 18 is equal to the width of the movable door 16, the observation window 18 is distributed on the inner side of the movable door 16, the working state of the running parts at the inner side of the device can be observed, the change of the parts in the cutting process can be recorded, a rotating shaft 9 is movably penetrated through the inner side of the bearing 8, the outer wall of the rotating shaft 9 is connected with a blade 10, the outer side of the main body 1 is provided with an operation box 11, the inner part of the main body 1 is provided with a telescopic rod 13, the telescopic rod 13 and the movable plate 12 form a movable structure through a second connecting shaft 27, the thicknesses of the movable plate 12 and the base plate 14 are equal, when the device carries out cutting work on parts, the parts need to be arranged and operated, and the movable plate 12 is driven to move under the extension action of the telescopic rod 13, the movable plate 12 is rotated by the rotation of the second connecting shaft 27, so that the inclination angle of the part can be adjusted, the device can conveniently cut parts with different angles, and the flexibility of the device is improved;
the top of the base plate 14 is provided with a first fixed strip 15, a bolt 23 penetrates through the inner side of the first fixed strip 15, one end of the bolt 23, which is far away from the first fixed strip 15, is provided with a movable strip 22, the movable strip 22 is in sliding connection with a limiting groove 21, the lengths of the movable strip 22, the first fixed strip 15 and the second fixed strip 20 are equal, when the base plate 14 carries out placement work on parts, the parts are clamped through the action of the movable strip 22 and the second fixed strip 20, the bolt 23 is screwed, so that the movable strip 22 moves along the inner side of the limiting groove 21 through a movable block at the bottom of the movable strip, the clamping force of the device on the parts can be increased, the inner side of the base plate 14 is provided with a frame 19, the limiting groove 21 is fixed inside the base plate 14, the frame 19 is fixedly connected with the base plate 14, the base plate 14 is matched with the movable plate 12 in shape, under the connection action of the frame 19 and the base plate 14, the connectivity between the two can be strengthened to through the effect of frame 19, make the piece that produces in the cutting process can slide to the bottom of device, be convenient for the later stage concentrate and carry out cleaning operation, the top of base plate 14 is provided with second fixed strip 20, the top of telescopic link 13 is settled there is movable plate 12, movable plate 12 is connected with telescopic link 13 through second connecting axle 27, and movable plate 12 is close to the inboard of main part 1 and is settled there is base plate 14, base plate 14 is connected with movable plate 12 through first connecting axle 26.
The working principle of the embodiment is as follows: the routing cooling mechanism for preventing high-temperature sparks in machining and rapid cutting comprises a mechanical part, wherein the mechanical part is placed and operated, when the part is placed at the top of a base plate 14, the part can be clamped under the action of a movable strip 22 and a second fixed strip 20, when the part is stably operated by the movable strip 22 and the second fixed strip 20, a bolt 23 needs to be screwed, so that the movable strip 22 moves to one side of the second fixed strip 20 along the inner side of a limiting groove 21 through a movable block at the bottom of the movable strip 22, the length of the movable strip 22 is consistent with that of the second fixed strip 20, the clamping force of the device on the part can be increased, meanwhile, the outer side of the part is not prone to sinking, then, a water pump 3 is started, water flow on the inner side of a water tank 2 is sprayed along a main pipeline 4 and an auxiliary pipeline 6, and the part and a blade 10 are pre-moistened, then, the hydraulic rod 7 is started, so that the bearing 8 drives the rotating shaft 9 to move downwards, so that the blade 10 moves to a part to be machined, when the rotating shaft 9 moves downwards, the left and right rotating operation of the rotating shaft 9 is not easy to occur under the distribution action of the fixed groove 25 and the rotating shaft 9, the deformation phenomenon between the main body 1 and the operation box 11 is avoided, the device is ensured to be in the most excellent state to complete the cutting machining work, when the part is arranged above the movable plate 12 to perform the cutting work, the telescopic rod 13 is started, so that the movable plate 12 rotates under the extension action of the movable plate 12 and the rotating action of the second connecting shaft 27, the inclination angle of the part can be adjusted, the device is convenient to perform the cutting work on the parts with different angles, the flexibility of the device is improved, and when the device performs the quick cutting work on the part, the temperature sensor 24 (model: WRM-101) which is electrically connected in parallel can be used for performing patrol operation on the cold and hot degree of the device in a working state, so that a worker can know the cold and hot conditions of the inner side of the device in time, and the phenomenon of high-temperature sparks is prevented.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides a machining fly-cutting prevents cold mechanism of patrolling of high temperature spark, includes main part (1), trunk line (4) and temperature sensor (24), its characterized in that: the top of the main body (1) is provided with a water tank (2), the inner side of the water tank (2) is provided with a water pump (3), the main pipeline (4) is connected to the bottom end of the water pump (3), the bottom of the main pipeline (4) is provided with a connector (5), the outer side of the connector (5) is provided with an auxiliary pipeline (6), the inner wall of the top end of the main body (1) is provided with a hydraulic rod (7), the bottom of the hydraulic rod (7) is provided with a bearing (8), the inner side of the bearing (8) is movably penetrated with a rotating shaft (9), the outer wall of the rotating shaft (9) is connected with a blade (10), the outer side of the main body (1) is provided with an operating box (11), the inside of the main body (1) is provided with a telescopic rod (13), the top end of the telescopic rod (13) is provided with a movable plate (12), a substrate (14) is arranged on the inner side of the movable plate (12) close to the main body (1), and the substrate (14) is connected with the movable plate (12) through a first connecting shaft (26); the telescopic rod (13) and the movable plate (12) form a movable structure through a second connecting shaft (27), the thickness of the movable plate (12) is equal to that of the base plate (14), a first fixing strip (15) is arranged at the top of the base plate (14), a bolt (23) penetrates through the inner side of the first fixing strip (15), a movable strip (22) is arranged at one end, far away from the first fixing strip (15), of the bolt (23), a frame (19) is arranged at the inner side of the base plate (14), a limiting groove (21) is fixed in the base plate (14), and a second fixing strip (20) is arranged at the top end of the base plate (14); the frame (19) is fixedly connected with the substrate (14), and the substrate (14) is matched with the movable plate (12) in shape; the movable strip (22) is in sliding connection with the limiting groove (21), and the movable strip (22) is equal to the first fixed strip (15) and the second fixed strip (20) in length; the water tank (2) is fixedly connected with the main body (1), the central axis of the water tank (2) is coincident with the central axis of the main body (1), the temperature sensor (24) is arranged on the inner wall of the main body (1), and a fixing groove (25) is fixed inside the inner wall of the main body (1); the inner wall of the fixing groove (25) is attached to the outer side of the rotating shaft (9), and the circle center of a circle where the section of the rotating shaft (9) is located on the central axis of the fixing groove (25).
2. The routing mechanism for preventing high-temperature sparks in machining for rapid cutting according to claim 1, wherein: be threaded connection between connector (5) and trunk line (4), auxiliary conduit (6), and the inboard width of trunk line (4) is greater than the inboard width of auxiliary conduit (6).
3. The routing mechanism for preventing high-temperature sparks in machining for rapid cutting according to claim 1, wherein: the hydraulic rod (7) is vertically distributed with the inner wall of the top end of the main body (1), the hydraulic rod (7) is symmetrical about the central axis of the main body (1), a door shaft (17) is arranged on the outer side of the main body (1), a movable door (16) is movably arranged on the outer wall of the door shaft (17), and an observation window (18) is installed on the inner side of the movable door (16).
4. The routing mechanism for preventing high-temperature sparks in machining for rapid cutting according to claim 3, wherein: the length of the observation window (18) is equal to the width of the movable door (16), and the observation window (18) is distributed on the inner side of the movable door (16) in a rectangular shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811218106.3A CN109202527B (en) | 2018-10-18 | 2018-10-18 | Quick cutting of machining prevents cold mechanism of patrolling of high temperature spark |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811218106.3A CN109202527B (en) | 2018-10-18 | 2018-10-18 | Quick cutting of machining prevents cold mechanism of patrolling of high temperature spark |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109202527A CN109202527A (en) | 2019-01-15 |
| CN109202527B true CN109202527B (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811218106.3A Active CN109202527B (en) | 2018-10-18 | 2018-10-18 | Quick cutting of machining prevents cold mechanism of patrolling of high temperature spark |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206066274U (en) * | 2016-08-31 | 2017-04-05 | 天津市叁盛缘电子有限公司 | A kind of fixing tool for producing electric capacity |
| CN206811729U (en) * | 2017-03-08 | 2017-12-29 | 王文萱 | A kind of metal material surface burnishing device of low noise |
| CN207577983U (en) * | 2017-09-21 | 2018-07-06 | 江苏省福达特种钢有限公司 | Boring positioning tool |
| CN107999821A (en) * | 2017-12-27 | 2018-05-08 | 佛山市达普光机电科技有限公司 | A kind of small lot automobile buffer beam automatic punching mechanism |
| CN108544270A (en) * | 2018-07-05 | 2018-09-18 | 合肥市科惠特机械制造有限公司 | A kind of pneumatics machining shell fixing device |
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Effective date of registration: 20201104 Address after: 221300 No. 88 Liaohe West Road, Pizhou Economic Development Zone, Xuzhou City, Jiangsu Province Applicant after: SU Normal University Semiconductor Materials and Equipment Research Institute (Pizhou) Co.,Ltd. Address before: Shenbei New Area Puchang road Shenyang City, Liaoning province 110136 No. 18 Shenyang Institute of Engineering Applicant before: Chen Liqin |
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Effective date of registration: 20211222 Address after: 221300 506, block B, electronic industrial park, Pizhou Economic Development Zone, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Bochuang Construction Development Group Co.,Ltd. Address before: No.88 Liaohe West Road, Pizhou Economic Development Zone, Xuzhou City, Jiangsu Province Patentee before: SU Normal University Semiconductor Materials and Equipment Research Institute (Pizhou) Co.,Ltd. |
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Effective date of registration: 20230621 Address after: Haihe Road, Pizhou City, Xuzhou City, Jiangsu Province 221000 Patentee after: XUZHOU UNE INNOVATIVE TECHNOLOGY CO.,LTD. Address before: 221300 506, block B, electronic industrial park, Pizhou Economic Development Zone, Xuzhou City, Jiangsu Province Patentee before: Xuzhou Bochuang Construction Development Group Co.,Ltd. |
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