CN109826287B - Sewer pipe connecting structure for building construction - Google Patents
Sewer pipe connecting structure for building construction Download PDFInfo
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- CN109826287B CN109826287B CN201910164895.5A CN201910164895A CN109826287B CN 109826287 B CN109826287 B CN 109826287B CN 201910164895 A CN201910164895 A CN 201910164895A CN 109826287 B CN109826287 B CN 109826287B
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Abstract
The invention discloses a sewer pipe connecting structure for building construction, which comprises a first connecting pipe and a second connecting pipe, wherein the first connecting pipe and the second connecting pipe are fixedly connected through a connecting flange and a fastening bolt matched with the connecting flange, connecting seats are welded on the first connecting pipe and the second connecting pipe respectively, the two connecting seats are arranged in opposite directions and are fixedly connected through a connecting screw rod, the joints of the two connecting seats and the connecting screw rod are respectively provided with a screwing nut, the two screwing nuts are sleeved on the connecting screw rod on one side of the connecting seats away from the connecting flange, a damping mounting seat is arranged below the two connecting seats respectively, and comprises a first reset spring, a connecting plate, a second reset spring and a mounting plate. The connection safety is improved.
Description
Technical Field
The invention belongs to the technical field of building construction sewer pipe connection, and particularly relates to a sewer pipe connection structure for building construction.
Background
Along with the acceleration of urbanization process, more and more areas are building the building, the building of building is from the installation that can not open sewer pipe, sewer pipe's installation is accomplished through sewer pipe's multistage formula concatenation, current sewer pipe has the installation difficulty in connecting, and the condition of revealing can appear after connecting, the leakproofness of its junction can not effectively be ensured, can produce the vibrations of pipeline itself when using simultaneously, can produce the abnormal sound, current sewer pipe connects firm inadequately simultaneously, easily impaired.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a sewer pipe connection structure for building construction, which solves the problems of poor sealing performance and insufficient stability of installation and connection in the conventional sewer pipe connection.
In order to solve the above problems, the present invention provides a technical solution:
a sewer pipe connecting structure for building construction comprises a first connecting pipe and a second connecting pipe, wherein the first connecting pipe and the second connecting pipe are fixedly connected through a connecting flange and a fastening bolt matched with the connecting flange, connecting seats are welded on the first connecting pipe and the second connecting pipe respectively, the two connecting seats are arranged in opposite directions and are fixedly connected through a connecting screw rod, the joints of the two connecting seats and the connecting screw rod are respectively provided with a screwing nut, the two screwing nuts are sleeved on the connecting screw rod on one side of the connecting seat away from the connecting flange, a damping mounting seat is arranged below the two connecting seats respectively, the damping mounting seat comprises a first reset spring, a connecting plate, a second reset spring and a mounting plate, the upper end of the first reset spring is fixedly mounted in a mounting hole below the connecting seat, and the lower end of the first reset spring is fixedly connected with the connecting plate, the connecting plate is characterized in that a second reset spring is fixedly installed in the installation hole below the connecting plate, the lower end of the second reset spring is fixedly connected with the installation plate, two ends of the installation plate are respectively provided with a grounding nut, the number of the first reset springs in the middle of the connecting seat and the connecting plate is three, the number of the second reset springs in the middle of the connecting plate and the installation plate is two, and the number of the second reset springs in each group is three.
Preferably, a connecting flange extending out of the connecting flange is arranged at one end of the second connecting pipe connected with the first connecting pipe, the connecting flange extends into the first connecting pipe and is arranged, a front baffle ring is arranged on the inner wall of the first connecting pipe, the front end of the connecting flange is in abutting connection with the front baffle ring, a rear baffle ring is arranged at the position, close to the connecting flange, of the inner wall of the first connecting pipe, the inner diameter of the front baffle ring is smaller than that of the rear baffle ring, the outer wall of the connecting flange is in abutting connection with the rear baffle ring, a shaft sleeve coaxial with the rear baffle ring is welded on the rear baffle ring, the outer wall of the connecting flange is in abutting connection with the shaft sleeve, the shaft sleeve extends towards the front baffle ring, a hollow cavity is formed between the shaft sleeve and the inner wall of the first connecting pipe, filler is filled in the hollow cavity, and a filler cushion ring and a filler cover ring are respectively arranged at one end, close, filler backing ring and filler cover ring establish to the wedge form that matches each other, the one end that filler cover ring is close to flange is connected with the packing briquetting, fixedly connected with ratch on the packing briquetting, the ratch other end insert in the back fender ring and with back fender ring threaded connection, the meshing is connected with the bull stick on the ratch, the bull stick stretches out first connecting pipe setting, one side that filler backing ring is close to preceding fender ring is equipped with two sliding blocks, the sliding block is located in the spout that preceding fender ring is close to filler backing ring one side, just filler backing ring is contradicted with preceding fender ring and flange front end and is connected.
Preferably, flange joint on first connecting pipe and the second connecting pipe is equipped with protecting sheathing, protecting sheathing includes casing and cap, the position between first connecting pipe external connection seat and the flange is located to the cap cover, just first internal thread that the cap passes through the cap inner wall and the first external screw thread threaded connection on the first connecting pipe outer wall, the position between second connecting pipe external connection seat and the flange is located to the housing cover, just the second internal thread that the casing passes through shells inner wall and the second external screw thread threaded connection of second connecting pipe outer wall, concave structure is all established to cap and casing, just third internal thread that casing and cap pass through the cap outward flange and the third external screw thread threaded connection of casing outward flange.
Preferably, the connecting seat is provided with a threaded hole matched with the connecting screw rod.
Preferably, one end of the rotating rod extending out of the first connecting pipe is connected with a rotating handle.
Preferably, the packing pressing blocks arranged at one end, close to the connecting flange, of the packing cover ring are multiple, and the packing pressing blocks are uniformly distributed in a hollow cavity formed by the shaft sleeve and the inner wall of the first connecting pipe.
Preferably, the number of the packing backing rings is two, and the two packing backing rings are both in a semi-cylindrical shape.
Preferably, the sliding block is slidably connected with a sliding groove on the front retaining ring.
The invention has the beneficial effects that: the invention relates to a sewer pipe connecting structure for building construction, when in connection, firstly, a connecting flange of a second connecting pipe is inserted into a first connecting pipe for arrangement, then two connecting flanges are fixedly connected by fastening bolts, then connecting bases on the first connecting pipe and the second connecting pipe are connected by a connecting screw rod for improving the connection stability, then a handle is rotated to enable a toothed bar in a hollow cavity to drive a packing pressing block to push a packing cover ring, the packing cover ring extrudes packing, and further, a packing backing ring which is connected on a front retaining ring in a sliding way is extruded, so that the packing backing ring extrudes and contacts the abutting positions of the connecting flange and the front retaining ring, the sealing performance of the connecting position of the first connecting pipe and the second connecting pipe is improved, the problem of leakage at the connecting position is avoided, then, a protective shell outside the first connecting pipe and the second connecting pipe is rotated to enable a shell and a shell cover to be in threaded connection, therefore, the joint is sealed again, the joint is prevented from being corroded and damaged, the connected first connecting pipe and the connected second connecting pipe are fixedly installed through the damping installation seat, the damping installation seat has a damping function, and abnormal sound caused by overlarge vibration generated when the connecting pipeline is filled with water is avoided.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic front view of the shock mount of the present invention;
FIG. 3 is a schematic side view of the shock mount of the present invention;
FIG. 4 is a schematic view of the internal structure of the present invention;
FIG. 5 is an enlarged schematic view of the present invention at A;
fig. 6 is a schematic structural diagram of the protective housing of the present invention.
In the figure: 1. a first connecting pipe; 2. a second connecting pipe; 3. a connecting flange; 4. fastening a bolt; 5. a connecting seat; 6. connecting a screw rod; 7. screwing the nut; 8. a shock-absorbing mounting seat; 9. a first return spring; 10. a connecting plate; 11. a second return spring; 12. mounting a plate; 13. mounting holes; 14. a ground nut; 15. a connecting flange; 16. a front baffle ring; 17. a rear baffle ring; 18. a shaft sleeve; 19. a hollow cavity; 20. a filler; 21. a packing grommet; 22. a packing cover ring; 23. pressing the filler into blocks; 24. a rack bar; 25. a rotating rod; 26. a slider; 27. a chute; 28. a protective housing; 29. a housing; 30. a shell cover; 31. a first internal thread; 32. a first external thread; 33. a second internal thread; 34. a second external thread; 35. a third internal thread; 36. a third external thread; 37. a threaded hole; 38. the handle is rotated.
The specific implementation mode is as follows:
as shown in fig. 1 to 6, the following technical solutions are adopted in the present embodiment: a sewer pipe connecting structure for building construction comprises a first connecting pipe 1 and a second connecting pipe 2, wherein the first connecting pipe 1 and the second connecting pipe 2 are fixedly connected through a connecting flange 3 and a fastening bolt 4 matched with the connecting flange 3, connecting seats 5 are welded on the first connecting pipe 1 and the second connecting pipe 2 respectively, the two connecting seats 5 are arranged in opposite directions, the two connecting seats 5 are fixedly connected through a connecting screw 6, a screwing nut 7 is arranged at the joint of each of the two connecting seats 5 and the connecting screw 6, the two screwing nuts 7 are sleeved on the connecting screw 6 on the side, away from the connecting flange 3, of each connecting seat 5, a damping mounting seat 8 is arranged below each connecting seat 5, each damping mounting seat 8 comprises a first reset spring 9, a connecting plate 10, a second reset spring 11 and a mounting plate 12, the upper end of the first reset spring 9 is fixedly mounted in a mounting hole 13 below each connecting seat 5, first reset spring 9 lower extreme fixedly connected with connecting plate 10, second reset spring 11 of fixed mounting in mounting hole 13 of connecting plate 10 below, 11 lower extreme fixed connection mounting panels 12 of second reset spring, mounting panel 12 both ends respectively are equipped with a ground nut 14, first reset spring 9 in connecting seat 5 and the connecting plate 10 centre is equipped with threely, second reset spring 11 in the middle of connecting plate 10 and mounting panel 12 is equipped with two sets ofly, every group second reset spring 11 is equipped with threely.
Wherein: a connecting flange 15 extending out of the connecting flange 3 is arranged at one end of the second connecting pipe 2 connected with the first connecting pipe 1, the connecting flange 15 extends into the first connecting pipe 1, a front retaining ring 16 is arranged on the inner wall of the first connecting pipe 1, the front end of the connecting flange 15 is connected with the front retaining ring 16 in an abutting mode, a rear retaining ring 17 is arranged at the position, close to the connecting flange 3, of the inner wall of the first connecting pipe 1, the inner diameter of the front retaining ring 16 is smaller than that of the rear retaining ring 17, the outer wall of the connecting flange 15 is connected with the rear retaining ring 17 in an abutting mode, a shaft sleeve 18 coaxial with the rear retaining ring 17 is welded on the rear retaining ring 17, the outer wall of the connecting flange 15 is connected with the shaft sleeve 18 in an abutting mode, the shaft sleeve 18 extends towards the front retaining ring 16, a hollow cavity 19 is formed by the shaft sleeve 18 and the inner wall of the first connecting pipe 1, a filler 20 is filled in the hollow cavity 19, and a filler backing ring 21, packing backing ring 21 and packing cover ring 22 establish to the wedge form that matches each other, the one end that packing cover ring 22 is close to flange 3 is connected with packing briquetting 23, fixedly connected with ratch 24 on the packing briquetting 23, the ratch 24 other end insert in the back fender ring 17 and with back fender ring 17 threaded connection, the meshing is connected with bull stick 25 on the ratch 24, bull stick 25 stretches out first connecting pipe 1 and sets up, one side that packing backing ring 21 is close to preceding fender ring 16 is equipped with two sliding blocks 26, sliding block 26 is located in the spout 27 that preceding fender ring 16 is close to packing backing ring 21 one side, and packing backing ring 21 is contradicted with preceding fender ring 16 and flange 15 front end and is connected.
Wherein: the connection flange 3 junction on first connecting pipe 1 and the second connecting pipe 2 is equipped with protecting sheathing 28, protecting sheathing 28 includes casing 29 and cap 30, the position between first connecting pipe 1 external connection seat 5 and flange 3 is located to the cap 30 cover, and the cap 30 passes through the first internal thread 31 of cap 30 inner wall and the first external screw thread 32 threaded connection on the first connecting pipe 1 outer wall, the position between second connecting pipe 2 external connection seat 5 and flange 3 is located to the housing 29 cover, and the second internal thread 33 of housing 29 inner wall and the second external screw thread 34 threaded connection of second connecting pipe 2 outer wall of housing 29, cap 30 and casing 29 all establish to the concave structure, and the third internal thread 35 of housing 29 and cap 30 through the cap 30 outward flange and the third external screw thread 36 threaded connection of housing 29 outward flange.
Wherein: be equipped with on connecting seat 5 with connecting screw 6 assorted screw hole 37, connecting screw 6 passes the screw hole 37 setting in the middle of two connecting seats 5 to carry out fixed connection through two nuts 7 of screwing, make the connection of first connecting pipe 1 and second connecting pipe 2 more firm. The end of the rotating rod 25 extending out of the first connecting pipe 1 is connected with a rotating handle 38, and the rotating handle 38 is rotated from the outside, so that the rotating rod 25 rotates to drive the toothed bar 24 to extrude the packing pressing block 23, and further extrude the packing 20. The packing pressing blocks 23 arranged at one end, close to the connecting flange 3, of the packing cover ring 22 are multiple, the packing pressing blocks 23 are evenly distributed in the hollow cavity 19 formed by the shaft sleeve 18 and the inner wall of the first connecting pipe 1, the packing cover ring 22 is extruded by the aid of the packing pressing blocks 23, and accordingly the packing 20 is extruded. Packing backing ring 21 is equipped with two, and two packing backing rings 21 all establish to the semi-cylindrical, and two semi-cylindrical packing backing rings 21 are all toward connecting flange 15 with keep off the 16 extrusion of department of contradicting of ring before for the leakproofness of junction is better, fine avoiding revealing the problem. The sliding block 26 is slidably connected with the sliding groove 27 on the front retaining ring 16, so that the packing backing ring 21 can move at the position where the connecting flange 15 and the front retaining ring 16 abut against each other, and the falling-off of the packing backing ring 21 during the disassembly is realized.
The using state of the invention is as follows: the invention relates to a sewer pipe connecting structure for building construction, when in connection, firstly, a connecting flange 15 of a second connecting pipe 2 is inserted into a first connecting pipe 1 for arrangement, then two connecting flanges 3 are fixedly connected by fastening bolts 4, then a connecting screw 6 is used for connecting seats 5 on the first connecting pipe 1 and the second connecting pipe 2 to increase the connection stability, then a rotating handle 38 is rotated to enable a toothed bar 24 in a hollow cavity 19 to drive a packing pressing block 23 to push a packing cover ring 22, the packing cover ring 22 extrudes a packing 20, and further an packing backing ring 21 which is connected on a front baffle ring 16 in a sliding way is extruded, so that the packing backing ring 21 extrudes and contacts the contact part of the connecting flange 15 and a front baffle ring 16, the sealing performance of the connection part of the first connecting pipe 1 and the second connecting pipe 2 is improved, the problem of leakage at the connection part is avoided, then a protective shell 28 outside the first connecting pipe 1 and the second connecting pipe 2 is rotated, the shell 29 and the shell cover 30 can be in threaded connection, so that the joint can be sealed again, the joint is prevented from being corroded and damaged, the first connecting pipe 1 and the second connecting pipe 2 after connection are fixedly installed by the shock absorption installation seat 8, the shock absorption installation seat 8 has a shock absorption function, abnormal sound caused by overlarge shock generated when a connecting pipeline is communicated with water is avoided, and the invention has the advantages of compact structure, convenience in installation, stronger functionality and better practicability.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. The utility model provides a sewer pipe connection structure for construction, includes first connecting pipe (1) and second connecting pipe (2), its characterized in that: the first connecting pipe (1) and the second connecting pipe (2) are fixedly connected through a connecting flange (3) and a fastening bolt (4) matched with the connecting flange (3), connecting seats (5) are welded on the first connecting pipe (1) and the second connecting pipe (2), the two connecting seats (5) are oppositely arranged, the two connecting seats (5) are fixedly connected through a connecting screw rod (6), a screwing nut (7) is arranged at the joint of each connecting seat (5) and the connecting screw rod (6), the two screwing nuts (7) are sleeved on the connecting screw rod (6) on one side, away from the connecting flange (3), of the connecting seat (5), damping mounting seats (8) are arranged below the two connecting seats (5), each damping mounting seat (8) comprises a first reset spring (9), a connecting plate (10), a second reset spring (11) and a mounting plate (12), the upper end of the first reset spring (9) is fixedly arranged in a mounting hole (13) below the connecting seat (5), the lower end of the first reset spring (9) is fixedly connected with a connecting plate (10), second reset springs (11) are fixedly arranged in the mounting hole (13) below the connecting plate (10), the lower end of each second reset spring (11) is fixedly connected with a mounting plate (12), two ends of each mounting plate (12) are respectively provided with a grounding nut (14), the number of the first reset springs (9) between the connecting seat (5) and the connecting plate (10) is three, the number of the second reset springs (11) between the connecting plate (10) and the mounting plate (12) is two, and the number of the second reset springs (11) in each group is three;
the one end that second connecting pipe (2) and first connecting pipe (1) are connected is equipped with the connecting flange (15) that stretches out flange (3), connecting flange (15) stretch into first connecting pipe (1) inside setting, just keep off ring (16) before first connecting pipe (1) inner wall is equipped with, connecting flange (15) front end is contradicted with preceding fender ring (16) and is connected, the position that first connecting pipe (1) inner wall is close to flange (3) is equipped with back fender ring (17), the internal diameter that keeps off ring (16) before is less than the internal diameter that keeps off ring (17) after, just the outer wall of connecting flange (15) is contradicted with back fender ring (17) and is connected, the welding has on back fender ring (17) and keeps off ring (17) coaxial axle sleeve (18) after, just the outer wall of connecting flange (15) is connected with axle sleeve (18) and is contradicted, axle sleeve (18) are kept off ring (16) direction and are extended the setting forward, the utility model discloses a packing material, including axle sleeve (18) and first connecting pipe (1) inner wall formation well cavity (19), well cavity (19) intussuseption is filled with filler (20), the one end that filler (20) were close to preceding fender ring (16) and back fender ring (17) is equipped with filler backing ring (21) and filler lid ring (22) respectively, filler backing ring (21) and filler lid ring (22) establish the wedge form that matches each other, the one end that filler lid ring (22) are close to flange (3) is connected with filler briquetting (23), fixedly connected with ratch (24) on filler briquetting (23), ratch (24) other end insert in back fender ring (17) and with back fender ring (17) threaded connection, the meshing is connected with bull stick (25) on ratch (24), bull stick (25) stretch out first connecting pipe (1) and set up, filler backing ring (21) are close to preceding one side of fender ring (16) and are equipped with two sliding blocks (26), the sliding block (26) is arranged in a sliding groove (27) on one side, close to the packing backing ring (21), of the front retaining ring (16), and the packing backing ring (21) is connected with the front retaining ring (16) and the front end of the connecting flange (15) in an abutting mode.
2. The sewer pipe connecting structure for building construction according to claim 1, wherein: the connecting structure is characterized in that a protective shell (28) is arranged at the connecting position of a connecting flange (3) on a first connecting pipe (1) and a second connecting pipe (2), the protective shell (28) comprises a shell body (29) and a shell cover (30), the shell cover (30) is sleeved at the position between an external connecting seat (5) of the first connecting pipe (1) and the connecting flange (3), the shell cover (30) is in threaded connection with a first external thread (32) on the outer wall of the first connecting pipe (1) through a first internal thread (31) on the inner wall of the shell cover (30), the shell body (29) is sleeved at the position between the external connecting seat (5) of the second connecting pipe (2) and the connecting flange (3), the shell body (29) is in threaded connection with a second external thread (34) on the outer wall of the second connecting pipe (2) through a second internal thread (33) on the inner wall of the shell body (29), and the shell cover (30) and the shell body (, and the shell body (29) and the shell cover (30) are in threaded connection with a third external thread (36) on the outer edge of the shell body (29) through a third internal thread (35) on the outer edge of the shell cover (30).
3. The sewer pipe connecting structure for building construction according to claim 1, wherein: and a threaded hole (37) matched with the connecting screw rod (6) is formed in the connecting seat (5).
4. The sewer pipe connecting structure for building construction according to claim 1, wherein: one end of the rotating rod (25) extending out of the first connecting pipe (1) is connected with a rotating handle (38).
5. The sewer pipe connecting structure for building construction according to claim 1, wherein: the packing cover ring (22) is provided with a plurality of packing press blocks (23) close to one end of the connecting flange (3), and the packing press blocks (23) are uniformly distributed in a hollow cavity (19) formed by the shaft sleeve (18) and the inner wall of the first connecting pipe (1).
6. The sewer pipe connecting structure for building construction according to claim 1, wherein: the packing cushion rings (21) are two, and the two packing cushion rings (21) are both in a semi-cylindrical shape.
7. The sewer pipe connecting structure for building construction according to claim 1, wherein: the sliding block (26) is connected with a sliding groove (27) on the front retaining ring (16) in a sliding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910164895.5A CN109826287B (en) | 2019-03-05 | 2019-03-05 | Sewer pipe connecting structure for building construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910164895.5A CN109826287B (en) | 2019-03-05 | 2019-03-05 | Sewer pipe connecting structure for building construction |
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| Publication Number | Publication Date |
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| CN109826287A CN109826287A (en) | 2019-05-31 |
| CN109826287B true CN109826287B (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910164895.5A Active CN109826287B (en) | 2019-03-05 | 2019-03-05 | Sewer pipe connecting structure for building construction |
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| CN (1) | CN109826287B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062428A (en) * | 2021-03-24 | 2021-07-02 | 鹏图建设有限公司 | Sewage pipeline aspect processing node and process thereof |
| CN113062431A (en) * | 2021-04-07 | 2021-07-02 | 鹏图建设有限公司 | Rainwater pipeline aspect treatment node and process thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3347454A1 (en) * | 1983-12-29 | 1985-07-11 | Artur 8038 Gröbenzell Kunder | System for the connection of pipes |
| CN106678464B (en) * | 2017-03-09 | 2018-10-19 | 金华市唯创机械技术研发有限公司 | A kind of seal for pipe joints connection structure |
| CN107504296A (en) * | 2017-09-29 | 2017-12-22 | 绵阳头坝科技有限公司 | A kind of Petroleum Pipehead of good seal performance |
| CN207728038U (en) * | 2018-01-09 | 2018-08-14 | 杭州市水务控股集团有限公司 | A kind of secondary water-supply sound insulation pump house |
| CN208311716U (en) * | 2018-06-06 | 2019-01-01 | 青岛能源设计研究院有限公司 | A kind of natural gas line of preservative treatment |
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Effective date of registration: 20210510 Address after: 325200 Yunzhou street urban rural distribution center 520 (Qiaomao town), Ruian City, Wenzhou City, Zhejiang Province Applicant after: Ruian Ruo building materials Co.,Ltd. Address before: 325200 No.6, new street, Yuhai street, Ruian City, Wenzhou City, Zhejiang Province Applicant before: Dai Yi |
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Effective date of registration: 20230419 Address after: No. 26 Qianyang East Road, Taifeng Office, Qianjiang City, Hubei Province, 433100 Patentee after: Hubei Tongsheng Construction Engineering Co.,Ltd. Address before: 325200 Yunzhou street urban rural distribution center 520 (Qiaomao town), Ruian City, Wenzhou City, Zhejiang Province Patentee before: Ruian Ruo building materials Co.,Ltd. |
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