CN211976223U - Rotary gas circuit transmission device and laser cutting machine - Google Patents
Rotary gas circuit transmission device and laser cutting machine Download PDFInfo
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- CN211976223U CN211976223U CN202020098234.5U CN202020098234U CN211976223U CN 211976223 U CN211976223 U CN 211976223U CN 202020098234 U CN202020098234 U CN 202020098234U CN 211976223 U CN211976223 U CN 211976223U
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Abstract
The utility model belongs to the technical field of rotatory gas circuit, especially, relate to a rotatory gas circuit transmission device and laser cutting machine. The rotary gas path transmission device comprises a gas distribution front disc, a gas distribution rear disc and a fixing ring provided with a first gas inlet; the gas distribution front disc is provided with a first gas outlet hole and fixedly connected with the gas distribution rear disc through the fixing ring; the fixed ring is rotationally connected with the air distribution front disc and the air distribution rear disc which are fixedly connected; the first air inlet hole is communicated with the first air outlet hole. The utility model provides a smooth and easy ventilation of rotatory gas circuit can be realized to rotatory gas circuit transmission device, and processing and maintenance are simple, simple to operate.
Description
Technical Field
The utility model belongs to the technical field of rotatory gas circuit, especially, relate to a rotatory gas circuit transmission device and laser cutting machine.
Background
At present, in tubular product type laser cutting equipment, because there is relative rotation between the fixing base that laser instrument and fixed waited to cut will be, the event needs to use rotatory gas circuit transmission device between the trachea of connecting the trachea of laser instrument and the trachea of connecting the fixing base to guarantee to connect the trachea of laser instrument and connect between the trachea of fixing base in the laser cutting process in the pivoted, remain the state of ventilating throughout (if lead to the trachea winding folding then can't guarantee smoothly ventilating because rotate). Among the prior art, because there is the relation of rotating the connection between the trachea of connecting the laser instrument and the trachea of connecting the fixing base, sealed requirement to rotatory gas circuit transmission device is very high, and current rotatory gas circuit transmission device structure is more complicated, can not realize smoothly ventilating, and the risk of leaking gas is very high, has still in addition to install complicacy, the lower scheduling problem of life-span.
Disclosure of Invention
The utility model discloses there is to current rotatory gas circuit transmission device to be the structure complicacy, can not realize the scheduling problem of smoothly ventilating, provides a rotatory gas circuit transmission device.
In view of the above technical problem, an embodiment of the present invention provides a rotary gas circuit transmission device, which includes a gas distribution front disc, a gas distribution rear disc, and a fixing ring provided with a first gas inlet; the gas distribution front disc is provided with a first gas outlet hole and fixedly connected with the gas distribution rear disc through the fixing ring; the fixed ring is rotationally connected with the air distribution front disc and the air distribution rear disc which are fixedly connected; the first air inlet hole is communicated with the first air outlet hole.
Optionally, the rotary gas path transmission device further comprises a first sealing ring; the fixing ring is provided with a first annular groove matched with the first sealing ring; the gas distribution rear disc is connected with the fixing ring in a sealing mode through the first sealing ring installed in the first annular groove.
Optionally, a first ventilation space, a first air outlet and a first air inlet are arranged on the first sealing ring; the first air inlet hole is communicated with the first ventilation space through the first air inlet; a first channel communicated with the first ventilation space through the first air outlet is arranged on the air distribution rear disc; and a second channel is arranged on the air distribution front disc, and the first channel is communicated with the first air outlet hole through the second channel.
Optionally, a first annular communicating groove communicated with the first annular groove is further formed in the air distribution rear disc; the first passage is communicated with the first ventilation space through the first annular communication groove and the first air outlet.
Optionally, the fixing ring is further provided with a second air inlet hole; and a second air outlet hole is also formed in the air distribution front disc, and the second air inlet hole is communicated with the second air outlet hole. The rotary gas path transmission device also comprises a second sealing ring; a second annular groove matched with the second sealing ring is formed in the fixing ring; the air distribution front disc is in sealing connection with the fixing ring through the second sealing ring installed in the second annular groove.
Optionally, a second ventilation space, a second air outlet and a second air inlet are arranged on the second sealing ring; the second air inlet hole is communicated with the second ventilation space through the second air inlet; the second air outlet hole is communicated with the second ventilation space through the second air outlet.
Optionally, a second annular communicating groove communicated with the second annular groove is further formed in the air distribution front disc; the second air outlet hole is communicated with the second air ventilation space through the second annular communication groove and the second air outlet.
Optionally, the rotary gas path transmission device further comprises a first ball; the fixing ring is provided with a third annular groove, and the gas distribution rear disc is abutted to the first ball in the third annular groove.
Optionally, the rotary gas path transmission device further comprises a second ball; and the fixing ring is provided with a fourth annular groove for mounting the second ball, and the gas distribution front disc is abutted to the second ball.
Optionally, the rotary air channel transmission device further comprises a roller pin connected between the fixing ring and the air distribution front disc.
The rotary gas circuit transmission device comprises a gas distribution front disc, a gas distribution rear disc and a fixing ring provided with a first gas inlet; the gas distribution front disc is provided with a first gas outlet hole and fixedly connected with the gas distribution rear disc through the fixing ring; the fixed ring is rotationally connected with the air distribution front disc and the air distribution rear disc which are fixedly connected; the first air inlet hole is communicated with the first air outlet hole. In this embodiment, the gas distribution front disc and the gas distribution rear disc of the rotary gas path transmission device adopt a split design, so that the processing technology of the rotary gas path transmission device is simple, and the gas distribution front disc and the gas distribution rear disc are conveniently installed in the fixed ring, thereby reducing the manufacturing cost of the rotary gas path transmission device and facilitating the assembly and the future maintenance of the rotary gas path transmission device; in the process of the rotary motion of the air distribution front disc, the air distribution rear disc and the fixing ring, the first air inlet hole and the first air outlet hole can be smoothly ventilated with the fixing ring at any position of 360-degree rotation, and the applicability of the rotary air path transmission device is improved.
The utility model also provides a laser cutting device, including foretell rotatory gas circuit transmission device.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of a rotary gas circuit transmission device according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a rotary gas path transmission device according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of the rotary gas path transmission device according to an embodiment of the present invention, taken along a central axis of the first gas outlet;
fig. 4 is a cross-sectional view of the rotary gas path transmission device according to an embodiment of the present invention, taken along a central axis of the second gas outlet;
fig. 5 is a cross-sectional view of the rotary air path transmission device according to an embodiment of the present invention, taken along a central axis of the second air inlet;
fig. 6 is a front view of a first sealing ring of a rotary gas circuit transmission device according to an embodiment of the present invention;
fig. 7 is a sectional view taken along the line a-a in fig. 6.
The reference numerals in the specification are as follows:
1. a gas distribution front disc; 11. a first air outlet hole; 12. a second channel; 13. a second air outlet; 14. a second annular communication groove; 2. distributing a gas back plate; 21. a first channel; 22. a first annular communicating groove; 3. a fixing ring; 31. a first air intake hole; 32. a first annular groove; 33. a second air intake hole; 34. a second annular groove; 35. a third annular groove; 36. a fourth annular groove; 4. a first seal ring; 41. a first plenum space; 42. a first air outlet; 43. a first air inlet; 6. a first ball bearing; 7. a second ball bearing; 8. and (4) rolling needles.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the utility model provides a rotary gas circuit transmission device, which comprises a gas distribution front disc 1, a gas distribution rear disc 2 and a fixing ring 3 provided with a first gas inlet 31; a first air outlet hole 11 is formed in the air distribution front disc 1, and the air distribution front disc 1 penetrates through the fixing ring 3 to be fixedly connected (in threaded connection and the like) with the air distribution rear disc 2; the fixed ring 3 is rotationally connected with the air distribution front disc 1 and the air distribution rear disc 2 which are fixedly connected; the first air inlet hole 31 communicates with the first air outlet hole 11. It can be understood that the design of the air distribution front disk 1 and the air distribution rear disk 2 can simplify the processing technology of each process hole in the air distribution front disk 1 and the air distribution rear disk 2 and facilitate the installation of the air distribution front disk 1 and the air distribution rear disk 2 into the fixing ring 3. The first air inlet 31 of the fixing ring 3 is connected with a first vent pipeline of an external device (the first vent pipeline comprises a pipeline on a laser cutting machine fixing seat and the like), the first air outlet 11 on the air distribution front disc 1 is connected with a second vent pipeline of the external device (the second vent pipeline comprises a pipeline on a laser cutting machine and the like), and the first vent pipeline is rotationally connected with the second vent pipeline.
In this embodiment, the gas distribution front disc 1 and the gas distribution rear disc 2 of the rotary gas path transmission device adopt a split design, so that the processing technology of the rotary gas path transmission device is simple, and the gas distribution front disc 1 and the gas distribution rear disc 2 are conveniently installed in the fixing ring 3, thereby reducing the manufacturing cost of the rotary gas path transmission device and facilitating the assembly and the future maintenance of the rotary gas path transmission device; in the process of the rotary motion of the air distribution front disc 1, the air distribution rear disc 2 and the fixing ring 3, the first air inlet hole 31 and the first air outlet hole 11 can keep a smooth ventilation state with the fixing ring 3 at any position of 360-degree rotation, and the applicability of the rotary air path transmission device is improved.
In an embodiment, as shown in fig. 4, the rotary air channel transmission device further includes a first sealing ring 4; a first annular groove 32 matched with the first sealing ring 4 is formed in the fixing ring 3; the gas distribution rear disc 2 is connected with the fixing ring 3 in a sealing way through the first sealing ring 4 installed in the first annular groove 32. It can be understood that, because the gas distribution back plate 2 and the fixing ring 3 have a rotating connection relationship, the first sealing ring 4 needs to be used for realizing sealing, so as to prevent the gas entering the first gas inlet hole 31 from leaking due to poor sealing between the gas distribution back plate 2 and the fixing ring 3, and improve the gas transmission efficiency of the rotary gas path transmission device.
In an embodiment, as shown in fig. 3, 6 and 7, the first sealing ring 4 is provided with a first venting space 41, a first air outlet 42 and a first air inlet 43; the first intake holes 31 communicate with the first plenum 41 through the first intake ports 43; a first channel 21 communicated with the first ventilation space 41 through the first air outlet 42 is arranged on the air distribution rear disc 2; it is understood that the first sealing ring 4 has a multi-layer structure (at least two layers, so as to form a first venting space 41 between two adjacent layers), and the first outlet 42 and the first inlet 43 are communicated with the first venting space 41 of the first sealing ring 4, so as to ensure that gas can pass through the first sealing ring 4; the air distribution front disc 1 is provided with a second channel 12, and the first channel 21 is communicated with the first air outlet hole 11 through the second channel 12. Specifically, before the first air inlet hole 31 is vented, the first channel 21 and the first air outlet hole 11 may be sealed (for example, plugged by a plunger or the like or sealed by a non-venting manner of a communicated air pipe or the like), and after the first air inlet hole 31 is vented, the gas entering from the first air inlet hole 31 enters the first venting space 41 of the first sealing ring 4 through the first annular groove 32 and the first air inlet 43, so that the first sealing ring is expanded, and the gas distribution rear disc 2 is hermetically connected to the fixing ring 3; in the process that the air distribution rear disc 2 and the fixing ring 3 rotate, the first air inlet 31 of the air distribution rear disc 2 is connected with external equipment and is ventilated, and the ventilation process is as follows: the first vent space 41 of the first gasket 4 is configured such that the gas passes through the first passage 21 and the second passage 12 in this order, and is discharged from the first outlet hole 11 together with the second passage 12. It will be appreciated that the introduction of air through the first inlet hole 31 expands the first sealing ring 4 to achieve a better sealing effect. In addition, the first channel 21 is communicated with the external environment, so that the processing of the first channel 21 is facilitated, and the processing difficulty of the first channel 21 is reduced.
In an embodiment, as shown in fig. 3 and 4, a first annular communicating groove 22 communicating with the first annular groove 32 is further provided on the air distribution rear disc 2; the first passage 21 communicates with the first ventilation space 41 through the first annular communication groove 22 and the first air outlet 42. It can be understood that, at any position of the gas distribution rear disc 2 and the central shaft of the fixing ring 3 which rotate by 360 degrees, the first annular communicating groove 22 is communicated with the first annular groove 32, and the first sealing ring 4 is installed in the first annular groove 32, so that the gas input from the first gas inlet 31 can enter the first annular communicating groove 22 through the first sealing ring 4, and then is output through the first gas outlet 11 communicated with the first annular communicating groove 22, and therefore, the gas distribution front disc 1 and the fixing ring 3 can be ensured to be in a ventilation state in the process of rotating by 360 degrees.
In one embodiment, as shown in fig. 1 and 5, the fixing ring 3 is further provided with a second air inlet hole 33; a second air outlet hole 13 is further formed in the air distribution front disc 1, and the second air inlet hole 33 is communicated with the second air outlet hole 13; it can be understood that, in the process of rotating the air distribution front disc 1 and the fixing ring 3, the second air inlet hole 33 and the second air outlet hole 13 are always kept in a communication state; in addition, after the front disc is fixedly connected with the gas distribution rear disc 2, in the process of rotating the fixing ring 3, the first gas inlet 31 and the first gas outlet 11, and the second gas inlet 33 and the second gas outlet 13 are always kept in a communicated state, for example, the rotary gas path transmission device is applied to a gas inlet pipeline and a gas outlet pipeline of a hydraulic cylinder (the pneumatic cylinder can be applied to a laser cutting machine), the first gas inlet 31 and the first gas outlet 12 are connected with the gas inlet pipeline of the pneumatic cylinder, and the second gas inlet 33 and the second gas outlet 13 are connected with the gas outlet pipeline of the cylinder, so that the connection of the gas inlet pipeline and the gas outlet pipeline of the pneumatic cylinder is realized.
The rotary gas path transmission device also comprises a second sealing ring 5; the fixing ring 3 is provided with a second annular groove 34 matched with the second sealing ring 5; the air distribution front disc 1 is connected with the fixing ring 3 in a sealing mode through the second sealing ring 5 installed in the second annular groove 34. It can be understood that, because the gas distribution rear disc 2 and the fixing ring 3 have a rotating connection relationship, the second sealing ring 5 needs to be used for realizing sealing, so as to prevent the gas entering the second gas inlet hole 33 from leaking due to poor sealing between the gas distribution front disc 1 and the fixing ring 3, and improve the gas transmission efficiency of the rotary gas path transmission device.
In an embodiment, the second seal ring 5 is provided with a second ventilation space, a second air outlet and a second air inlet; the second air inlet hole 33 is communicated with the second ventilating space through the second air inlet; the second air outlet hole 13 is communicated with the second ventilation space through the second air outlet. It is understood that the second sealing ring 5 has a multi-layer structure (at least two layers), and the second gas outlet and the second gas inlet communicate with the second venting space of the second sealing ring 5 to ensure that gas can pass through the second sealing ring 5; immediately, as shown in fig. 6 and 7, the second sealing ring is similar to the first sealing ring 4, and the second vent space, the second outlet port, and the second inlet port of the second sealing ring 5 correspond to the first vent space 41, the first outlet port 42, and the first inlet port 43 of the first sealing ring 4, respectively; specifically, before the second air inlet hole 33 is ventilated, the second outlet air is sealed by a hole (for example, the second outlet air is sealed by a plunger or the like, a communicated air pipe is not ventilated, and the like), after the second air inlet hole 33 is ventilated, the gas entering from the second air inlet hole 33 enters the second ventilation space of the second sealing ring 5 through the second annular groove 34 and the second air inlet, so that the second sealing ring is expanded, and the gas distribution front disc 1 is hermetically connected to the fixing ring 3; when the air distribution front disc 1 and the fixing ring 3 rotate, the second air inlet 33 of the air distribution front disc 1 is connected with external equipment and is ventilated, and the ventilation process is as follows: and the second ventilation space gas of the second sealing ring 5 passes through the second air outlet hole 13 and is output. It can be understood that the gas introduced through the second gas inlet hole 33 expands the second sealing ring, so that a better sealing effect is achieved.
In an embodiment, as shown in fig. 5, a second annular communicating groove 14 communicating with the second annular groove 34 is further provided on the air distribution front disc 1; the second air outlet hole 13 is communicated with the second air ventilation space through the second annular communication groove 14 and the second air outlet. It can be understood that, at any position where the central axes of the gas distribution front disc 1 and the fixing ring 3 rotate by 360 degrees, the second annular communicating groove 14 is communicated with the second annular groove 34, and the second sealing ring 5 is installed in the second annular groove 34, so that the gas input from the second gas inlet 33 can enter the second annular communicating groove 14 through the second sealing ring 5, and then is output through the second gas outlet 13 communicated with the second annular communicating groove 14, and therefore, the ventilation state can be ensured in the process of rotating the gas distribution front disc 1 and the fixing ring 3 by 360 degrees.
In one embodiment, as shown in fig. 3 to 6, the rotary air channel transmission device further includes a first ball 6; and a third annular groove 35 is formed in the fixing ring 3, and the gas distribution rear disc 2 is abutted against the first ball 6 in the third annular groove 35. It can be understood that the plurality of first balls 6 are annularly arranged in the third annular groove 35, and the first balls 6 are used for limiting the axial movement of the fixing ring 3, reducing the friction force between the air distribution rear disc 2 and the fixing ring 3 during rotation, and prolonging the service life of the rotary air path transmission device.
In one embodiment, as shown in fig. 3 to 6, the rotary air channel transmission device further comprises a second ball 7; and a fourth annular groove 36 for mounting the second ball 7 is formed in the fixing ring 3, and the gas distribution front disc 1 is abutted to the second ball 7. It can be understood that, the plurality of second balls 7 are annularly arranged in the fourth annular groove 36, and the second balls 7 further limit axial movement of the fixing ring 3, reduce friction force when the distribution front disc 1 and the fixing ring 3 rotate, and prolong the service life of the rotary air path transmission device.
In one embodiment, as shown in fig. 3 to 6, the rotary air channel transmission device further includes a needle roller 8 connected between the fixing ring 3 and the air distribution front disc 1. It can be understood that the plurality of the needle rollers 8 are arranged in parallel in the center of each needle roller 8 between the fixing ring 3 and the valve actuating front disc 1, and the needle rollers 8 are used for converting sliding friction between the valve actuating front disc 1 and the fixing ring 3 into rolling friction, so that the service lives of the fixing front disc and the fixing ring 3 are prolonged.
The utility model also provides a laser cutting machine, including foretell rotatory gas circuit transmission device. This laser cutting machine includes fixing base and laser instrument, just first vent line on the fixing base connects solid fixed ring first inlet port 31, and the second vent line on this laser cutting machine's the laser instrument is connected first venthole 11 on the distribution front bezel 1, when laser cutting machine rotary cutting waited to cut the work piece, first vent line with there is the rotation between the second vent line, and rotatory gas circuit transmission device has realized first vent line with when the second vent line is rotatory, keep smooth and easy ventilation state throughout.
The above embodiments are only examples of the rotary gas circuit transmission device of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A rotary gas path transmission device is characterized by comprising a gas distribution front disc, a gas distribution rear disc and a fixing ring provided with a first gas inlet hole; the gas distribution front disc is provided with a first gas outlet hole and fixedly connected with the gas distribution rear disc through the fixing ring; the fixed ring is rotationally connected with the air distribution front disc and the air distribution rear disc which are fixedly connected; the first air inlet hole is communicated with the first air outlet hole.
2. The rotary gas circuit transfer device of claim 1, further comprising a first seal ring; the fixing ring is provided with a first annular groove matched with the first sealing ring; the gas distribution rear disc is connected with the fixing ring in a sealing mode through the first sealing ring installed in the first annular groove.
3. The rotary gas circuit transmission device according to claim 2, wherein the first sealing ring is provided with a first ventilation space, a first gas outlet and a first gas inlet; the first air inlet hole is communicated with the first ventilation space through the first air inlet; a first channel communicated with the first ventilation space through the first air outlet is arranged on the air distribution rear disc; and a second channel is arranged on the air distribution front disc, and the first channel is communicated with the first air outlet hole through the second channel.
4. The rotary gas circuit transmission device according to claim 3, wherein a first annular communicating groove communicated with the first annular groove is further formed in the gas distribution rear disc; the first passage is communicated with the first ventilation space through the first annular communication groove and the first air outlet.
5. The rotary air channel transmission device as claimed in claim 1, wherein the fixing ring is further provided with a second air inlet hole; a second air outlet hole is also formed in the air distribution front disc, and the second air inlet hole is communicated with the second air outlet hole;
the rotary gas path transmission device also comprises a second sealing ring; a second annular groove matched with the second sealing ring is formed in the fixing ring; the air distribution front disc is in sealing connection with the fixing ring through the second sealing ring installed in the second annular groove.
6. The rotary gas circuit transmission device according to claim 5, wherein a second vent space, a second gas outlet and a second gas inlet are formed on the second sealing ring; the second air inlet hole is communicated with the second ventilation space through the second air inlet; the second air outlet hole is communicated with the second ventilation space through the second air outlet.
7. The rotary air channel transmission device according to claim 6, wherein a second annular communicating groove communicated with the second annular groove is further formed in the air distribution front disc; the second air outlet hole is communicated with the second air ventilation space through the second annular communication groove and the second air outlet.
8. The rotary air channel transfer device according to claim 1, further comprising a first ball; the fixing ring is provided with a third annular groove, and the gas distribution rear disc is abutted to the first ball arranged in the third annular groove; and/or
The rotary gas path transmission device also comprises a second ball; and the fixing ring is provided with a fourth annular groove for mounting the second ball, and the gas distribution front disc is abutted to the second ball.
9. The rotary air channel transfer device according to claim 1, further comprising a needle roller connected between the retaining ring and the air distribution front disk.
10. A laser cutting machine comprising the rotary gas path transmission device of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020098234.5U CN211976223U (en) | 2020-01-16 | 2020-01-16 | Rotary gas circuit transmission device and laser cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020098234.5U CN211976223U (en) | 2020-01-16 | 2020-01-16 | Rotary gas circuit transmission device and laser cutting machine |
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| Publication Number | Publication Date |
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| CN211976223U true CN211976223U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020098234.5U Active CN211976223U (en) | 2020-01-16 | 2020-01-16 | Rotary gas circuit transmission device and laser cutting machine |
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| CN (1) | CN211976223U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433402A (en) * | 2021-12-31 | 2022-05-06 | 福建金泰机械制造有限公司 | Brake drum paint spraying device and paint spraying method |
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2020
- 2020-01-16 CN CN202020098234.5U patent/CN211976223U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433402A (en) * | 2021-12-31 | 2022-05-06 | 福建金泰机械制造有限公司 | Brake drum paint spraying device and paint spraying method |
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Effective date of registration: 20230922 Address after: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee after: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Address before: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee before: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Patentee before: HAN'S LASER SMART EQUIPMENT GROUP Co.,Ltd. |