CN215393707U - Continuous intelligent forming device for large-caliber stainless steel straight welded pipe - Google Patents
Continuous intelligent forming device for large-caliber stainless steel straight welded pipe Download PDFInfo
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Abstract
The utility model relates to a continuous intelligent forming device for a large-diameter stainless steel straight welded pipe, which belongs to the technical field of production of straight welded stainless steel pipes. The forming device and the preparation method provided by the utility model have the advantages of high intelligent degree and high production efficiency, can be used for producing stainless steel straight welded pipes with various specifications by one set of machine set, reduce the production cost and are beneficial to the development and application of the production of the straight welded pipes.
Description
Technical Field
The utility model belongs to the technical field of straight-seam stainless steel welded pipe production, and particularly relates to a continuous intelligent forming device for a large-caliber stainless steel straight-seam welded pipe.
Background
The stainless steel straight welded pipe/cylinder is a stainless steel pipe/cylinder which is formed by bending and welding a stainless steel plate, is mainly used in numerous fields with extremely high requirements on corrosion resistance, such as petrochemical industry, ocean engineering and the like, is widely applied to the aspects of petrochemical industry, power industry, urban construction and the like, can convey liquid and gas, and can also be used as a pipe for piling, bridges, wharfs, roads and building structures. However, the existing straight welded pipe has the problems of low intelligent degree, low production efficiency and the like in the production process, and in addition, one set of straight welded pipe production line can only produce welded pipes with the same pipe diameter, so that the production cost is improved, the floor area of equipment is increased, and the development and the application of the production of the straight welded pipe are also seriously hindered.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a continuous intelligent forming device for a large-caliber stainless steel straight welded pipe, and stainless steel straight welded pipes with various specifications can be produced by one set of machine set.
The utility model is realized by the following technical scheme.
The utility model provides a continuous intelligent forming device of heavy-calibre stainless steel longitudinal welded pipe which characterized in that: the production process of the large-diameter stainless steel straight welded pipe is sequentially provided with an uncoiling device, a steel plate flattening device, a butt welding device, a steel plate pressing and guiding device, a rough forming rolling unit, a fine forming rolling unit, an automatic welding device, an inner and outer welding bead leveling device, an online degreasing device, an online solid solution device, a rough sizing unit, a fine sizing straightening unit, a fixed-length shearing device, an end trimming and opening flattening device, a lower line quality detection device, a ray detection device, a water pressure/air tightness test device, an acid pickling passivation device, an eddy current detector, a finished product inspection device and a package identification device;
the steel plate leveling device comprises a pinch roll device, a steel plate leveling machine and a transmission device, wherein the transmission device is arranged on one side of an inlet of the pinch roll device, the pinch roll device is arranged on one side of the inlet of the steel plate leveling machine, the transmission device sends the uncoiled steel plate into the pinch roll device, and the pinch roll device conveys the steel plate into the inlet side of the steel plate leveling machine;
the butt welding device for the crop ends comprises a steel plate centering device I, a butt welding machine for the crop ends and a steel plate centering device II, wherein the steel plate centering device I and the steel plate centering device II are respectively arranged on the inlet side and the outlet side corresponding to the butt welding machine for the crop ends;
the rough forming rolling unit comprises at least five rough forming rolling mills which are sequentially arranged, each rough forming rolling mill comprises a rack, a screw-down device, an upper roller and a lower roller, the upper roller and the lower roller are arranged on the rack, the screw-down device is arranged on the rack and is arranged above the upper roller, and the screw-down device drives the upper roller to move downwards; in the rough-forming rolling mill train, the roll profile of each rough-forming rolling mill is gradually reduced in diameter.
Further, the uncoiling device comprises an uncoiling trolley and an uncoiler, and the uncoiling trolley conveys the coil to be rolled to an inlet position of the uncoiler.
Further, the steel plate leveling machine comprises an upper machine base, an upper leveling roller, a lower leveling roller and a lower machine base, wherein the upper leveling roller is installed in the upper machine base, the lower leveling roller is installed in the lower machine base, and the steel plate penetrates through a roller gap between the upper leveling roller and the lower leveling roller.
Further, the fine forming rolling unit comprises a fine forming rolling mill I, a fine forming rolling mill II and a fine forming rolling mill III which are sequentially arranged, wherein the fine forming rolling mill I is composed of four vertical rolling mills.
Furthermore, the coarse sizing unit comprises a coarse sizing mill I, a coarse sizing mill II, a coarse sizing mill III and a coarse sizing mill IV which are sequentially arranged.
Furthermore, the finish diameter straightening unit comprises a finish diameter straightening machine I and a finish diameter straightening machine II which are sequentially arranged, the finish diameter straightening machine I and the finish diameter straightening machine II are both provided with four rollers which are arranged along a cross shape, and the included angles between the roller shafts of the two finish diameter straightening machines are arranged at 45 degrees.
Compared with the prior art, the utility model has the beneficial effects that:
the continuous intelligent forming device for the large-caliber stainless steel straight welded pipe provided by the utility model has the advantages of high intelligent degree and high production efficiency, can be used for producing stainless steel straight welded pipes with various specifications through one set of machine set, reduces the production cost, and is beneficial to development and application of straight welded pipe production.
Drawings
FIG. 1 is a schematic view of an equipment line of the present invention;
FIG. 2 is a schematic view of the unwinding device;
FIG. 3 is a schematic view of a steel plate leveling device;
FIG. 4 is a schematic top view of the structure of FIG. 3;
FIG. 5 is a schematic structural view of a butt welding device;
FIG. 6 is a schematic structural view of a rough forming rolling mill train;
FIG. 7 is a schematic view of a roughing mill configuration;
FIG. 8 is a schematic view of the structure of the upper roll of the rough forming mill;
FIG. 9 is a schematic view of the lower roll structure of the rough forming mill;
FIG. 10 is a schematic structural view of a finish forming rolling mill train;
FIG. 11 is a schematic structural view of a finish forming rolling mill I;
FIG. 12 is a schematic structural view of a diameter-sizing straightener set;
FIG. 13 is a schematic view of the arrangement structure of a roll of a straightening machine I with a precise diameter;
FIG. 14 is a schematic view of the arrangement structure of rolls of a straightening machine II with a precise diameter;
in the figure:
1 is an uncoiling device, 1.1 is an uncoiling trolley, and 1.2 is an uncoiler;
2, a steel plate leveling device and 2.1 a pinch roll device; 2.2 is a steel plate leveler, 2.2.1 is an upper machine base, 2.2.2 is an upper leveling roll, 2.2.3 is a lower leveling roll, and 2.2.4 is a lower machine base; 2.3 is a transmission device;
3 is a butt welding device for crop ends, 3.1 is a steel plate centering device I, 3.2 is a butt welding machine for crop ends, and 3.3 is a steel plate centering device II;
4, a steel plate pressing guide device;
5 is a rough forming rolling unit, 5.1 is a rough forming rolling mill I, 5.1.1 is a frame, 5.1.2 is a screw-down device, 5.1.3 is an upper roller, and 5.1.4 is a roller; 5.2 is a rough forming rolling mill II, 5.3 is a rough forming rolling mill III, 5.4 is a rough forming rolling mill IV, and 5.5 is a rough forming rolling mill V;
6 is a fine forming rolling unit, 6.1 is a fine forming rolling mill I, 6.2 is a fine forming rolling mill II, and 6.3 is a fine forming rolling mill III;
7 is an automatic welding device, 8 is an inner and outer welding bead leveling device, 9 is an online degreasing device, and 10 is an online solid solution device;
11 is a coarse sizing unit, 11.1 is a coarse sizing mill I, 11.2 is a coarse sizing mill II, 11.3 is a coarse sizing mill III, and 11.4 is a coarse sizing mill IV;
12 is a diameter-sizing straightener, 12.1 is a diameter-sizing straightener I, and 12.1.1 is a diameter-sizing straightener roller I; 12.2 is a diameter-sizing straightening machine II, and 12.2.1 is a diameter-sizing straightening machine roller II;
the device comprises a fixed-length shearing device 13, an end trimming and opening flattening device 14, an offline quality detection device 15, a ray detection device 16, a water pressure/air tightness test device 17, an acid pickling and passivation device 18, an eddy current detector 19, a finished product detection device 20 and a package identification device 21.
Detailed Description
The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the utility model as defined in the appended claims.
The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe shown in the figures 1 to 14 is characterized in that: the production process of the large-caliber stainless steel straight welded pipe is sequentially provided with an uncoiling device 1, a steel plate leveling device 2, a butt welding device 3, a steel plate pressing and guiding device 4, a rough forming rolling unit 5, a fine forming rolling unit 6, an automatic welding device 7, an inner and outer weld bead leveling device 8, an online degreasing device 9, an online solid solution device 10, a rough sizing unit 11, a fine sizing straightening unit 12, a fixed-length shearing device 13, an end trimming and flattening device 14, an off-line quality detection device 15, a ray detection device 16, a water pressure/air tightness test device 17, an acid cleaning and passivation device 18, an eddy current detector 19, a finished product inspection device 20 and a package identification device 21;
the steel plate leveling device 2 comprises a pinch roll device 2.1, a steel plate leveling machine 2.2 and a transmission device 2.3, wherein the transmission device 2.3 is arranged on one side of an inlet of the pinch roll device 2.1, the pinch roll device 2.1 is arranged on one side of the inlet of the steel plate leveling machine 2.2, the transmission device 2.3 sends the uncoiled steel plate into the pinch roll device 2.1, and the pinch roll device 2.1 conveys the steel plate into the inlet side of the steel plate leveling machine 2.2;
the butt welding device for the crop ends comprises a steel plate centering device I3.1, a butt welding machine for the crop ends 3.2 and a steel plate centering device II 3.3, wherein the steel plate centering device I3.1 and the steel plate centering device II 3.3 are respectively arranged on the inlet side and the outlet side corresponding to the butt welding machine for the crop ends 3.2;
the rough forming rolling unit 5 comprises at least five rough forming rolling mills which are sequentially arranged, each rough forming rolling mill comprises a frame 5.1.1, a screw-down device 5.1.2, an upper roller 5.1.3 and a lower roller 5.1.4, the upper roller 5.1.3 and the lower roller 5.1.4 are arranged on the frame 5.1.1, the screw-down device 5.1.2 is arranged on the frame 5.1.1 and is arranged above the upper roller 5.1.3, and the screw-down device 5.1.2 drives the upper roller 5.1.3 to move downwards; in the roughing mill train 5, the roll profile of each roughing mill is gradually reduced (the upper and lower rolls of the other mills of the train are not shown).
Further, the uncoiling device 1 comprises an uncoiling trolley 1.1 and an uncoiler 1.2, and the uncoiling trolley 1.1 conveys the coil to be rolled to the inlet position of the uncoiler 1.2.
Further, the steel plate leveling machine 2.2 comprises an upper machine base 2.2.1, an upper leveling roller 2.2.2, a lower leveling roller 2.2.3 and a lower machine base 2.2.4, wherein the upper leveling roller 2.2.2 is arranged in the upper machine base 2.2.1, the lower leveling roller 2.2.3 is arranged in the lower machine base 2.2.4, and the steel plate penetrates through a roller gap between the upper leveling roller 2.2.2 and the lower leveling roller 2.2.3.
Further, the finish rolling mill train 6 comprises a finish rolling mill I6.1, a finish rolling mill 6.2 II and a finish rolling mill III 6.3 which are sequentially arranged, wherein the finish rolling mill I6.1 consists of four vertical rolling mills.
Furthermore, the coarse sizing unit 11 comprises a coarse sizing mill I11.1, a coarse sizing mill II 11.2, a coarse sizing mill III 11.3 and a coarse sizing mill IV 11.4 which are arranged in sequence.
Further, the finish sizing straightening unit 12 comprises a finish sizing straightening machine I12.1 and a finish sizing straightening machine II 12.2 which are sequentially arranged, the finish sizing straightening machine I12.1 and the finish sizing straightening machine II 12.2 are respectively provided with four rollers which are arranged along a cross shape, and the included angles between the roll shafts of the two finish sizing straightening machines are arranged at 45 degrees.
The use process of the device is as follows:
s1, uncoiling: the uncoiling trolley 1.1 conveys a coil to be rolled to the inlet position of the uncoiler 1.2, and the steel coil is uncoiled on the uncoiler 1.2;
s2, leveling: the uncoiling device 1 sends the steel plate uncoiled in the step S1 to the steel plate leveling device 2, the transmission device 2.3 sends the uncoiled steel plate to the pinch roll device 2.1, and the pinch roll device 2.1 clamps the steel plate to be leveled to enter the inlet side of the steel plate leveling machine 2.2 to perform sedan leveling before welding the steel plate;
s3, butt welding by head cutting: the steel plate leveled in the step S2 is sent to a butt-welding device for crop ends 3, the head of the next section of steel plate is centered and clamped by a steel plate centering device I3.1, the tail of the previous section of steel plate is centered and clamped by a steel plate centering device II 3.3, and the two ends of the head and the tail of the front and the back steel plates are cut, tidily and welded into a whole by a butt-welding machine for crop ends 3.2, so that the production continuity is ensured;
s4, pressing, guiding and edge planing of the steel plate: the steel plate pressing and guiding device 4 presses the edge of the steel plate with the end-cutting and butt-welding integrated in the step S3, prevents the steel plate from jumping up and down, plays a role in centering, guiding and edge planing at the same time, enables the edge of the steel plate to be neat and flat, and is ready for rough rolling forming;
s5, rough rolling and forming: at least five rough forming rolling mills are sequentially arranged along the rough rolling forming direction, the roll shape of each stand roller is configured according to the rough rolling forming process, the stainless steel plate is gradually bent from the edge part to the middle part, and the stainless steel plate is rolled into a tubular or cylindrical blank;
s6, finish rolling and forming: the tubular or cylindrical blank after the rough rolling and forming in the step S5 is sequentially sent to a finish forming rolling mill I6.1, a finish forming rolling mill 6.2 II and a finish forming rolling mill III 6.3 along the finish forming direction, and finish rolling forming is carried out on the tubular or cylindrical blank to enable the size of the tubular or cylindrical blank to be close to that of a finished product pipe;
s7, automatic welding: the tubular or cylindrical blank after finish rolling forming in the step S6 is sent to an automatic welding device 7, the automatic welding device 7 heats the metal of the region to be welded of the welded pipe to a molten state, and the welding of the welding region of the tubular or cylindrical blank is realized by extrusion to prepare a stainless steel welded pipe;
s8, leveling inner and outer welding beads: the stainless steel welded pipe automatically welded in the step S7 is sent to the inner and outer weld bead leveling device 8, the inner weld bead of the stainless steel welded pipe is leveled, the residual height of the inner weld bead is removed, the outer weld bead of the stainless steel welded pipe is ground, the residual height of the outer weld bead is removed, and the inner and outer weld bead positions of the stainless steel welded pipe are flush with the base metal;
s9, online degreasing: sending the stainless steel welded pipe with the flattened inner and outer welding beads in the step S8 into an online degreasing device 9, removing grease on the surface of the stainless steel welded pipe, and cleaning the surface of the steel pipe;
s10, online solid solution: the stainless steel welded pipe degreased on line in the step S9 is sent to an on-line solution treatment device 10 for on-line solution treatment, so that the structure and the components of the stainless steel welded pipe are uniform, the internal stress is eliminated, and the inherent wear resistance of the stainless steel is recovered;
s11, coarse sizing forming: sequentially feeding the stainless steel welded pipe subjected to the online solid solution in the step S10 into a coarse sizing mill I11.1, a coarse sizing mill II 11.2, a coarse sizing mill III 11.3 and a coarse sizing mill IV 11.4 along the coarse sizing forming direction, eliminating the ovality of the stainless steel welded pipe subjected to the automatic welding in the step S7, and performing micro-rolling and stretching on the welded pipe;
s12, diameter sizing forming and straightening: the stainless steel welded pipe subjected to coarse sizing forming in the step S11 is sequentially sent to a fine sizing straightener I12.1 and a fine sizing straightener II 12.2 along the fine sizing forming direction, ovality of the stainless steel welded pipe is eliminated for the second time, size precision of the stainless steel welded pipe is improved, the stainless steel welded pipe is straightened in the length direction, internal stress is eliminated, and straightness of the welded pipe is guaranteed;
s13, cutting to length and detecting the quality of the off line: the stainless steel welded pipe straightened in the step S12 is sent into a sizing and shearing device 13, the stainless steel welded pipe is cut into a required sizing size by the sizing and shearing device 13, then the stainless steel welded pipe enters a lower line quality detection device 15 for comprehensive detection to ensure the quality of the welded pipe, and meanwhile, the end part of the stainless steel welded pipe is flattened by an end trimming and flattening device 14 at a lower line quality detection station to remove burrs;
s14, nondestructive inspection and sealing property detection: firstly, the stainless steel welded pipe after the offline quality detection in the step S13 is sent into a ray detection device 16, and the welding line is irradiated by rays to detect the internal defects, the types, the shapes, the sizes, the positions and the distribution of the internal defects; then, the stainless steel pipe enters a water pressure/air tightness test device 17 to carry out a water pressure/air tightness test, the tightness of the stainless steel welded pipe is checked, and whether an air leakage point exists is checked;
s15, acid washing and passivation: the stainless steel welded pipe subjected to the water pressure/air tightness detection in the step S14 is sent to an acid pickling passivation device 18, welding spots, iron oxide scales, stains and rusts on the surface of the welded pipe are removed, surface passivation is completed, the corrosion resistance of the stainless steel welded pipe is improved, and the surface of the stainless steel welded pipe is uniformly silvery white;
s16, eddy current detection and finished product inspection: firstly, the stainless steel welded pipe subjected to acid cleaning and passivation in the step S15 is sent to an eddy current detector 19, and the defects of the surface and the near surface of the stainless steel welded pipe are detected by using the electromagnetic induction principle; then, the stainless steel welded pipe after the eddy current detection is sent to a finished product inspection device 20, and appearance inspection, compactness inspection and strength inspection are carried out on the stainless steel welded pipe;
the appearance inspection is to inspect the defects and the size deviation of the surface of the welding seam, and can be used for detecting through tools such as a standard template, a gauge, a magnifier and the like, if the surface has defects, the possibility of defects in the welding seam exists; the compactness test is to detect the defects of cracks, air holes, slag inclusion, incomplete penetration, looseness and the like, and adopts methods such as a kerosene test, a water-carrying test, a water-flushing test and the like; the strength test can be performed by adopting a hydraulic test method and an air pressure test method;
s17, packaging and labeling: the stainless steel welded pipe qualified by the detection of the step S16 is sent to the package identification device 21, the product is packaged, the information identification of the product, such as the product name, the product model, the package external dimension, the product gross weight, the storage and transportation mark, the name and the address of the manufacturer, and the like, is pasted on the goods external package, and finally the finished stainless steel welded pipe leaves the factory.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. The utility model provides a continuous intelligent forming device of heavy-calibre stainless steel longitudinal welded pipe which characterized in that: the production process of the large-caliber stainless steel straight welded pipe sequentially comprises an uncoiling device (1), a steel plate flattening device (2), a butt welding device (3) for cutting ends, a steel plate pressing guide device (4), a rough forming rolling unit (5), a fine forming rolling unit (6), an automatic welding device (7), an inner and outer welding bead flattening device (8), an online degreasing device (9), an online solid solution device (10), a rough sizing unit (11), a fine sizing straightening unit (12), a fixed-length shearing device (13), an end trimming and flattening device (14), an off-line quality detection device (15), a ray detection device (16), a water pressure/air tightness test device (17), an acid pickling and passivation device (18), an eddy current detector (19), a finished product detection device (20) and a package identification device (21);
the steel plate leveling device (2) comprises a pinch roll device (2.1), a steel plate leveling machine (2.2) and a transmission device (2.3), the transmission device (2.3) is arranged on one side of an inlet of the pinch roll device (2.1), the pinch roll device (2.1) is arranged on one side of the inlet of the steel plate leveling machine (2.2), the transmission device (2.3) sends the uncoiled steel plate into the pinch roll device (2.1), and the pinch roll device (2.1) conveys the steel plate into the inlet side of the steel plate leveling machine (2.2);
the butt welding device for the crop ends (3) comprises a steel plate centering device I (3.1), a butt welding machine for the crop ends (3.2) and a steel plate centering device II (3.3), wherein the steel plate centering device I (3.1) and the steel plate centering device II (3.3) are respectively arranged on the inlet side and the outlet side corresponding to the butt welding machine for the crop ends (3.2);
the rough forming rolling unit (5) comprises at least five rough forming rolling mills which are sequentially arranged, each rough forming rolling mill comprises a rack (5.1.1), a screw-down device (5.1.2), an upper roller (5.1.3) and a lower roller (5.1.4), the upper roller (5.1.3) and the lower roller (5.1.4) are installed on the rack (5.1.1), the screw-down device (5.1.2) is installed on the rack (5.1.1) and is arranged above the upper roller (5.1.3), and the screw-down device (5.1.2) drives the upper roller (5.1.3) to move downwards; in the rough forming rolling mill set (5), the roll profile of each rough forming rolling mill is gradually reduced.
2. The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe according to claim 1, characterized in that: the uncoiling device (1) comprises an uncoiling trolley (1.1) and an uncoiler (1.2), wherein the uncoiling trolley (1.1) conveys a coil to be rolled to the inlet position of the uncoiler (1.2).
3. The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe according to claim 1, characterized in that: the steel plate leveling machine (2.2) comprises an upper machine base (2.2.1), an upper leveling roller (2.2.2), a lower leveling roller (2.2.3) and a lower machine base (2.2.4), wherein the upper leveling roller (2.2.2) is installed in the upper machine base (2.2.1), the lower leveling roller (2.2.3) is installed in the lower machine base (2.2.4), and a steel plate penetrates through a roll gap between the upper leveling roller (2.2.2) and the lower leveling roller (2.2.3).
4. The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe according to claim 1, characterized in that: the fine forming rolling unit (6) comprises a fine forming rolling mill I (6.1), a fine forming rolling mill (6.2) II and a fine forming rolling mill III (6.3) which are sequentially arranged, wherein the fine forming rolling mill I (6.1) consists of four vertical rolling mills.
5. The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe according to claim 1, characterized in that: the coarse sizing unit (11) comprises a coarse sizing machine I (11.1), a coarse sizing machine II (11.2), a coarse sizing machine III (11.3) and a coarse sizing machine IV (11.4) which are sequentially arranged.
6. The continuous intelligent forming device for the large-caliber stainless steel straight welded pipe according to claim 1, characterized in that: the precise sizing straightening unit (12) comprises a precise sizing straightening machine I (12.1) and a precise sizing straightening machine II (12.2) which are sequentially arranged, wherein the precise sizing straightening machine I (12.1) and the precise sizing straightening machine II (12.2) are respectively provided with four rollers which are arranged along a cross shape, and the included angles between the roll shafts of the two precise sizing straightening machines are arranged at 45 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120748060.7U CN215393707U (en) | 2021-04-13 | 2021-04-13 | Continuous intelligent forming device for large-caliber stainless steel straight welded pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120748060.7U CN215393707U (en) | 2021-04-13 | 2021-04-13 | Continuous intelligent forming device for large-caliber stainless steel straight welded pipe |
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Address after: 030600 North of No. 7 Road of Huitong Industrial Park, Jinzhong Development Zone, Jinzhong Comprehensive Reform Demonstration Zone, Shanxi Province Patentee after: Zhonggang Stainless Steel Pipe Industry Technology Shanxi Co.,Ltd. Address before: 030000 north of No.7 Road, Huitong Industrial Park, Jinzhong Development Zone, Jinzhong comprehensive reform demonstration zone, Shanxi Province Patentee before: SINOSTEEL STAINLESS STEEL PIPE TECHNOLOGY SHANXI CO.,LTD. |
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