CN110886579A - Continuous wall down-the-hole hammer drilling tool - Google Patents
Continuous wall down-the-hole hammer drilling tool Download PDFInfo
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- CN110886579A CN110886579A CN201911325681.8A CN201911325681A CN110886579A CN 110886579 A CN110886579 A CN 110886579A CN 201911325681 A CN201911325681 A CN 201911325681A CN 110886579 A CN110886579 A CN 110886579A
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- impactor
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- 238000005553 drilling Methods 0.000 title claims abstract description 40
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000013016 damping Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 17
- 239000002689 soil Substances 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
A kind of underground continuous wall down-the-hole hammer drilling tool, including connecting seat, two expansion frames, expansion cylinder, two tie rods, locate in expanding a plurality of impactors of the cavity of frame, impacter pin shaft and damping pad, the pivot of lower end of connecting seat installs two oscillating bars, the cavity is fixed to install the expansion cylinder; the lower end of the expansion oil cylinder is provided with two connecting rods, and the other ends of the two connecting rods are respectively arranged on lug seats of the two expansion brackets; the expansion oil cylinder makes telescopic action to drive the two connecting rods and the two expansion brackets to expand outwards and contract inwards; the impactors are arranged in a row in the front-back direction after being arranged in the mounting through holes of the inner cavity of the frame body of the expansion frame, and the drilling heads of the impactors perform pulse vibration on the stratum, impact broken rocks and drill into the rocks to form a rectangular underground continuous wall groove body. The invention is suitable for drilling and digging in soft soil stratum, cobble, boulder stratum, bedrock and other hard geology, and has the features of high verticality, high grooving precision, high construction efficiency, low construction cost, etc.
Description
Technical Field
The invention relates to the technical field of drilling and construction machinery equipment, in particular to a continuous wall down-the-hole hammer drilling tool.
Background
The pneumatic down-the-hole hammer drilling technology has the characteristic of high-efficiency rock breaking, and is widely applied to the fields of oil-gas exploration, metal mine exploration, foundation pile foundation drilling, rock-entering pile foundation construction and the like at present. The down-the-hole hammer is an impact tool taking compressed air as power, impact power is directly transmitted to a drill bit to perform pulsating crushing on rocks, crushed rock debris is discharged by utilizing the compressed air discharged by the down-the-hole hammer, and the purpose of drilling and hole cleaning through hole bottom impact rotary drilling is achieved. The compressed air can cool the drill bit and blow the broken rock debris away from the hole bottom and discharge the rock debris out of the hole opening, so that the purpose of quickly breaking rock is achieved. The down-the-hole hammer is particularly suitable for rock stratum broken stone drilling, has high working efficiency and low cost, but has the defects of high cost and low efficiency in a soil layer.
In the prior art, underground diaphragm wall grooving equipment mainly comprises construction equipment such as a hydraulic grab bucket, a percussion drill, a double-wheel mill and a multi-head drill, and is respectively used for drilling and excavating construction grooving under different geological conditions due to the structural characteristics and technical capability of the equipment. The hydraulic grab bucket has the advantages of simple structure, easy operation and maintenance, low running cost, suitability for the fourth-series covering layer, inapplicability to geological conditions such as boulders, bedrocks and the like, and very low construction efficiency especially when the standard penetration value is more than 40. The impact drill has strong adaptability to stratum, is suitable for common soft soil stratum, and can also use sand gravel, pebbles and bedrocks, but has low construction efficiency. The double-wheel milling is newly developed foundation construction equipment, has strong adaptability to stratum, can be excavated in silt, sand, gravel, pebble and medium-hard rock and concrete, has high drilling efficiency, and has the drilling efficiency of 20-40m in loose stratum3(ii)/h, drilling efficiency in medium-hard rock of 1-2m3The construction hole shape is regular, and the wall body is high in verticality; but is not suitable for boulder and pebble strata, is sensitive to ironware, steel bars and the like in the strata, and has complex equipment maintenance and high cost; the equipment is huge, the self weight is large, and the requirement on the field hardening condition is high. The multi-head drilling tool has the advantages of high digging speed, high mechanization degree and the like, but the equipment has a large volume and is not suitable for construction of complex strata such as pebble, boulder strata, bedrock and the like.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art, and provides a continuous wall down-the-hole hammer drilling tool which effectively combines the technical characteristics of down-the-hole hammers, utilizes an oil cylinder to push a left swing rod and a right swing rod to expand, carries out impact and gravel crushing on a rock stratum under the pneumatic impact of each down-the-hole hammer, finally forms a rectangular continuous wall long groove, discharges crushed rock debris by compressed air, realizes the purpose of carrying out impact rotary drilling and hole cleaning at the bottom of the continuous wall groove, effectively improves the construction operation efficiency, reduces the construction cost, and is suitable for drilling and digging construction under hard geological conditions such as pebbles, boulder strata, bedrocks and the like.
In order to achieve the above purpose, the solution adopted by the invention is as follows:
the utility model provides an underground continuous wall down-the-hole hammer drilling tool, includes connecting seat, two extension framves, extension hydro-cylinder, two connecting rods, is located a plurality of impactors, impacter round pin axle and the damping pad of extension frame inner chamber, wherein:
the two expansion frames comprise frame bodies, a plurality of mounting holes positioned in the inner cavity of the frame bodies, lug seats, upper end notches, a plurality of pairs of long grooves communicated with the mounting holes and a plurality of through holes;
the impactor comprises an impactor body, an upper end lifting lug, a drilling head and an air inlet;
the method is characterized in that:
the connecting seat is a hollow frame structure body, the upper end of the connecting seat is fixedly provided with an external drill rod assembly, and two expansion brackets are pivotally arranged at the corners of the lower end of the connecting seat;
the expansion oil cylinder is positioned in the inner cavity of the connecting seat, the upper end of the expansion oil cylinder is pivotally arranged at the top of the inner cavity of the connecting seat, the lower end of the expansion oil cylinder is hinged with two connecting rods, and the other ends of the two connecting rods are respectively hinged on the inner side lug seats of the left expansion frame and the right expansion frame; the expansion oil cylinder drives the two connecting rods and the two expansion frames to expand outwards and contract inwards when performing telescopic motion under the operation of an external hydraulic system;
the expansion frame is of a frame structure, and the swing rod is respectively inserted into corners of the lower end part of the connecting seat through notches at the upper end of the swing rod and then is hinged and installed on the left side and the right side of the connecting seat through pin shafts; the mounting holes are arranged in parallel and at equal intervals along the front and back directions of the inner cavity of the frame body of the expansion frame, and each pair of long grooves are respectively positioned on the outer side surface of the frame body of the expansion frame and are communicated with the upper end of each mounting hole; each through hole is positioned below each pair of long grooves;
the impactors are respectively arranged in the mounting holes of the frame body inner cavities of the left and right expansion frames through the impactors, and are arranged in a row in the front-back direction, and the lower ends of the impactors are fixedly provided with drilling heads and protrude out of the bottom planes of the frame bodies of the left and right expansion frames; each impactor is respectively arranged in each pair of long grooves on the outer side surfaces of the frame bodies of the left expansion frame and the right expansion frame after penetrating through the lifting lugs at the upper ends of the impacter through impactor pin shafts; the vibration damping pad is arranged in each mounting hole of the frame body inner cavities of the left expansion frame and the right expansion frame and is positioned at the top end of each impactor; the air inlets of the impactors are connected with an external air injection pipe, penetrate through holes on the outer side surfaces of the frame bodies of the left expansion frame and the right expansion frame and then are communicated with an external compressed air pumping system; thus, each impactor can do work by impacting downwards along the hole walls of the mounting holes of the inner cavities of the left expansion frame and the right expansion frame under the action of compressed air, and a drilling head at the lower end of each impactor is pushed to perform pulse vibration on the stratum, impact rock breaking and drill into rock.
The invention can ensure that the position degree deviation of each pair of long grooves on the outer side surface of the frame body of the expansion frame relative to the axial center of each corresponding mounting hole is less than or equal to 0.15 mm.
The invention can also be that the two connecting rods can be arranged in an arrangement mode of two connecting rods per group and two connecting rods in total, and the two connecting rods are respectively arranged at two sides of the cylinder barrel connecting fork at the lower end of the expansion oil cylinder.
Drawings
FIG. 1 is a schematic view of the structure of a down-the-hole hammer drill of the underground diaphragm wall of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a sectional view taken along line B-B of FIG. 2;
fig. 6 is a bottom view of fig. 2.
Detailed Description
According to the drawings of fig. 1-6, a down-the-hole hammer drill for underground continuous walls comprises a connecting seat 2, two expansion brackets 3, an expansion oil cylinder 4, two connecting rods 5, a plurality of impactors 6 positioned in the inner cavities of the expansion brackets, an impacter pin shaft 7 and a damping pad 8; the expansion frame 3 comprises a frame body 30, a plurality of mounting holes 31 positioned in the inner cavity of the frame body, lug seats 33, an upper end notch 34, a plurality of pairs of long grooves 35 communicated with the mounting holes and a plurality of through holes 36; the impactor 6 comprises an impactor body 60, an upper end lug 61, a drilling head 62 and an air inlet 63; wherein:
the connecting seat 2 is a hollow frame structure, the upper end of the connecting seat is fixedly provided with an external drill rod assembly, and the corner of the lower end of the connecting seat is pivotally provided with two swing rods 3.
The expansion oil cylinder 4 is positioned in the inner cavity of the connecting seat 2, the upper end of the expansion oil cylinder is pivotally arranged at the top of the inner cavity of the connecting seat 2, the lower end of the expansion oil cylinder is hinged with two connecting rods 5, and the other ends of the two connecting rods 5 are respectively hinged on the inner side ear seats 33 of the left expansion frame 3 and the right expansion frame 3; the expansion oil cylinder 4 drives the two connecting rods 5 and the two expansion frames 3 to expand outwards and contract inwards when performing telescopic motion under the operation of an external hydraulic system. The two connecting rods 5 can be arranged in a mode of two connecting rods per group and two connecting rods in total, and the two connecting rods are respectively arranged at two sides of a cylinder barrel connecting fork at the lower end of the extension oil cylinder 4. The expansion oil cylinder has the advantages that the piston of the expansion oil cylinder can stably transmit the acting force of the oil cylinder when stretching, the working reliability of the expansion oil cylinder and the connecting rod of the expansion oil cylinder is improved, and the service lives of the expansion oil cylinder and the expansion frame are effectively prolonged.
The expansion frame 3 is of a frame structure, and is respectively inserted into corners of the lower end part of the connecting seat 2 through notches 34 at the upper end of the expansion frame and then is hinged and installed at the left side and the right side of the connecting seat through pin shafts; the mounting holes 31 are arranged in parallel and equidistantly along the front and back direction of the expansion frame 3, and each pair of long slots 35 are respectively positioned on the outer side surface of the frame body 30 of the expansion frame 3 and are communicated with the upper end of each mounting hole 31; each through hole 36 is located below each pair of elongated slots 35. The deviation of the position degree of each pair of long grooves 35 on the outer side surface of the frame body 30 of the expansion frame 3 relative to the axial center of each corresponding mounting hole 31 is less than or equal to 0.15 mm. Therefore, the working stability and reliability of each impactor during impacting and doing work in the mounting hole of the expansion frame are effectively guaranteed, the impactor is prevented from generating large radial rotation, the drilling head is convenient to impact and break rock, and the service life is prolonged.
The impactors 6 are respectively arranged in a row in the front-back direction after being respectively arranged in the mounting holes 31 of the inner cavities of the frame bodies 30 of the left and right expansion frames 3 through impactors bodies 60, and drilling heads 62 at the lower ends of the impactors are protruded out of the bottom end planes of the left and right swing rods 3; each impactor 6 penetrates through the lifting lugs 61 at the upper ends of the impacter pins 7 and then is respectively arranged in each pair of long grooves 311 on the outer side surfaces of the left swing rod 3 and the right swing rod 3; the vibration damping pad 8 is arranged in each mounting hole 31 of the inner cavities of the frame bodies 30 of the left expansion frame 3 and the right expansion frame 3 and is positioned at the top end of each impactor 6; the air inlets 63 of the impactors 6 are connected with an external air injection pipe, penetrate through the through holes 36 on the outer side surfaces of the frame bodies 30 of the left expansion frame 3 and the right expansion frame 3 and are communicated with an external compressed air pumping system; thus, each impactor 6 can impact and do work downwards along the hole walls of the mounting holes 31 in the frame bodies 30 of the left and right expansion frames 3 under the action of compressed air, and push the drilling head 61 at the lower end of the impactor to vibrate the stratum in a pulse mode, impact broken rocks and drill into rocks. And finally drilling to finish the rectangular continuous wall long groove in the process of transversely moving the underground continuous wall down-the-hole hammer and vertically drilling the tool, and discharging rock debris out of the continuous wall long groove by externally connected compressed air.
The underground continuous wall down-the-hole hammer drilling tool is combined with the technical characteristics of down-the-hole hammers, a plurality of impactors are connected in parallel to form a left drilling unit and a right drilling unit, a left connecting rod and a right connecting rod are pushed by an expansion oil cylinder to expand, rock strata are impacted and crushed under the pneumatic impact of each down-the-hole hammer, the purpose of rapidly crushing rock is achieved, and rectangular continuous wall long grooves are formed finally; meanwhile, the crushed rock debris can be discharged by pumping compressed air through each impactor, and the purpose of cleaning holes by impact rotary drilling at the bottom of the continuous wall groove is achieved. The underground continuous wall down-the-hole hammer drilling tool is suitable for drilling and digging into rock under hard geological conditions such as sand gravel, pebble, boulder stratum, bedrock and the like besides common soft soil layer, has the characteristics of good verticality, high grooving precision, strong rock breaking capacity and the like, greatly improves the construction operation efficiency, effectively reduces the construction cost and reduces the construction period.
Claims (3)
1. The utility model provides an underground continuous wall down-the-hole hammer drilling tool, includes connecting seat (2), two extension framves (3), extension hydro-cylinder (4), two connecting rods (5), is located a plurality of impactors (6), impacter round pin axle (7) and damping pad (8) of extension frame inner chamber, wherein:
the expansion frame (3) comprises a frame body (30), a plurality of mounting holes (31) positioned in the inner cavity of the frame body, an ear seat (33), an upper end notch (34), a plurality of pairs of long grooves (35) communicated with the mounting holes and a plurality of through holes (36);
the impactor (6) comprises an impactor body (60), an upper end lifting lug (61), a drilling head (62) and an air inlet (63);
the method is characterized in that:
the connecting seat (2) is a hollow frame structure, the upper end of the connecting seat is fixedly provided with an external drill rod assembly, and the lower end corners of the connecting seat are pivotally provided with two expansion brackets (3);
the expansion oil cylinder (4) is positioned in the inner cavity of the connecting seat (2), the upper end of the expansion oil cylinder is pivotally arranged at the top of the inner cavity of the connecting seat (2), the lower end of the expansion oil cylinder is hinged with two connecting rods (5), and the other ends of the two connecting rods (5) are respectively hinged on the inner side ear seats (33) of the left expansion frame and the right expansion frame (3); the expansion oil cylinder (4) drives the two connecting rods (5) and the two expansion frames (3) to expand outwards and contract inwards when performing telescopic motion under the operation of an external hydraulic system;
the expansion frame (3) is of a frame structure, and is respectively inserted into corners of the lower end part of the connecting seat (2) through notches (34) at the upper ends of the expansion frame and then is hinged and installed at the left side and the right side of the connecting seat through pin shafts; the mounting holes (31) are arranged in parallel and at equal intervals along the front-back direction of an inner cavity of the frame body (30) of the expansion frame (3), and each pair of long grooves (35) are respectively positioned on the outer side surface of the frame body (30) of the expansion frame (3) and are communicated with the upper end of each mounting hole (31); each through hole (36) is positioned below each pair of long grooves (35);
the impactors (6) are respectively arranged in a row in the front-back direction of the impactors through installing holes (31) of the inner cavities of the frame bodies (30) of the left and right expansion frames (3) after the impactors (60) are arranged in the front-back direction, and the lower ends of the impactors are fixedly provided with drilling heads (62) and protrude out of the bottom planes of the frame bodies (30) of the left and right expansion frames (3); each impactor (6) penetrates through a lifting lug (61) at the upper end of the impactor through an impactor pin shaft (7) and then is respectively arranged in each pair of long grooves (311) on the outer side surfaces of the frame bodies (30) of the left expansion frame and the right expansion frame (3); the vibration damping pads (8) are arranged in the mounting holes (31) of the inner cavities of the frame bodies (30) of the left and right expansion frames (3) and are positioned at the top end of each impactor (6); the air inlets (63) of the impactors (6) are connected with an external air injection pipe, penetrate through the through holes (36) on the outer side surfaces of the frame bodies (30) of the left expansion frame and the right expansion frame (3) and then are communicated with an external compressed air pumping system; therefore, each impactor (6) can simultaneously impact downwards along the hole walls of the mounting holes (31) in the inner cavities of the frame bodies (30) of the left expansion frame and the right expansion frame (3) by the action of compressed air to do work, and the drilling head (61) at the lower end of the impactor is pushed to perform pulse vibration on the stratum, impact crushed rocks and drill into rocks.
2. An underground continuous wall down-the-hole hammer drill according to claim 1, characterized in that the positional deviation of each pair of elongated slots (35) on the outer side of the frame body (30) of the expansion frame (3) with respect to the axial center of each corresponding mounting hole (31) is less than or equal to 0.15 mm.
3. An underground continuous wall down-the-hole hammer drill according to claim 1, characterized in that the two connecting rods (5) are arranged in two groups, two groups in total, and are respectively installed at both sides of the cylinder tube fork at the lower end of the extension cylinder (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325681.8A CN110886579A (en) | 2019-12-20 | 2019-12-20 | Continuous wall down-the-hole hammer drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325681.8A CN110886579A (en) | 2019-12-20 | 2019-12-20 | Continuous wall down-the-hole hammer drilling tool |
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| Publication Number | Publication Date |
|---|---|
| CN110886579A true CN110886579A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911325681.8A Pending CN110886579A (en) | 2019-12-20 | 2019-12-20 | Continuous wall down-the-hole hammer drilling tool |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550179A (en) * | 2020-05-22 | 2020-08-18 | 杨忠财 | Rock-socketed wall forming system and method for continuous wall |
| CN111945815A (en) * | 2020-08-13 | 2020-11-17 | 陶德明 | Continuous wall rectangle breaker |
| CN112196460A (en) * | 2020-09-08 | 2021-01-08 | 李新形 | Underground continuous wall down-the-hole hammer grooving machine and using method thereof |
| RU2815398C1 (en) * | 2020-09-08 | 2024-03-14 | Синьсин ЛИ | Trencher with downhole pneumatic hammers for wall in soil and method of its application |
| WO2024088229A1 (en) * | 2022-10-26 | 2024-05-02 | 武汉通途鑫路桥工程有限公司 | Non-rotating down-the-hole hammer drilling machine and use method thereof |
-
2019
- 2019-12-20 CN CN201911325681.8A patent/CN110886579A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550179A (en) * | 2020-05-22 | 2020-08-18 | 杨忠财 | Rock-socketed wall forming system and method for continuous wall |
| CN111945815A (en) * | 2020-08-13 | 2020-11-17 | 陶德明 | Continuous wall rectangle breaker |
| CN112196460A (en) * | 2020-09-08 | 2021-01-08 | 李新形 | Underground continuous wall down-the-hole hammer grooving machine and using method thereof |
| WO2022052796A1 (en) * | 2020-09-08 | 2022-03-17 | 李新形 | Diaphragm wall down-the-hole hammer trenching machine and use method thereof |
| CN112196460B (en) * | 2020-09-08 | 2023-10-27 | 李新形 | Underground diaphragm wall down-the-hole hammer grooving machine and use method thereof |
| RU2815398C1 (en) * | 2020-09-08 | 2024-03-14 | Синьсин ЛИ | Trencher with downhole pneumatic hammers for wall in soil and method of its application |
| US11982157B2 (en) | 2020-09-08 | 2024-05-14 | Xinxing LI | Diaphragm wall down-the-hole hammer trenching machine and use method thereof |
| JP7527069B2 (en) | 2020-09-08 | 2024-08-02 | 李新形 | Down-the-hole hammer type trench digger for underground diaphragm walls and method of using same |
| EP4212696A4 (en) * | 2020-09-08 | 2024-10-16 | Xinxing Li | Diaphragm wall down-the-hole hammer trenching machine and use method thereof |
| WO2024088229A1 (en) * | 2022-10-26 | 2024-05-02 | 武汉通途鑫路桥工程有限公司 | Non-rotating down-the-hole hammer drilling machine and use method thereof |
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Effective date of registration: 20201229 Address after: 313012 No. 368, Shuanglin Avenue, Shuanglin Town, Nanxun District, Huzhou City, Zhejiang Province Applicant after: Zhejiang Jinzu environmental treatment equipment Co.,Ltd. Address before: 258 Yangnan Road, Baoshan District, Shanghai, 201091 Applicant before: SHANGHAI ENGINEERING MACHINERY Co.,Ltd. |