CN105804671A - Drill pipe telescopic type buffer device for down-the-hole drill gyrator - Google Patents
Drill pipe telescopic type buffer device for down-the-hole drill gyrator Download PDFInfo
- Publication number
- CN105804671A CN105804671A CN201610095756.8A CN201610095756A CN105804671A CN 105804671 A CN105804671 A CN 105804671A CN 201610095756 A CN201610095756 A CN 201610095756A CN 105804671 A CN105804671 A CN 105804671A
- Authority
- CN
- China
- Prior art keywords
- telescopic
- gyroscope
- gear shaft
- drilling rod
- buffer device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims description 39
- 239000003292 glue Substances 0.000 claims description 14
- 230000006978 adaptation Effects 0.000 claims description 13
- 239000004519 grease Substances 0.000 claims description 7
- 210000002445 nipple Anatomy 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 230000001141 propulsive effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
-
- 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
- E21B4/006—Mechanical motion converting means, e.g. reduction gearings
Landscapes
- 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)
- Fluid-Damping Devices (AREA)
Abstract
The invention provides a drill pipe telescopic type buffer device for a down-the-hole drill gyrator. The drill pipe telescopic type buffer device comprises a drill pipe telescopic sleeve assembly, the rear end of the drill pipe telescopic sleeve assembly is adaptively mounted at the gyrator output gear shaft end, and the front end of the drill pipe telescopic sleeve assembly can be connected with a drill pipe through threads. The drill pipe telescopic sleeve assembly comprises a connecting disc, an expansion sleeve, a locking nut, a telescopic sleeve, a telescopic joint, a shock-proof rubber mat and an air guiding pipe. By means of structure matching of the connecting disc, the expansion sleeve, the locking nut, the telescopic sleeve, the telescopic joint, the shock-proof rubber mat and the air guiding pipe, the drill pipe telescopic type buffer device has the dual buffering effects of air buffering and shock absorption through the shock-proof rubber mat, counter impact force of the drill pipe on a gear shaft is effectively relieved, the gyrator gear shaft and a gyrator bearing connected with the gyrator gear shaft are protected, and the service life of the gyrator is prolonged; mounting, dismounting and maintaining are facilitated, it is ensured that a down-the-hole drill can be normally used, and cost is reduced.
Description
Technical field
The present invention relates to down-the-hole drill and manufacture field, the drilling rod Telescopic buffer device of specifically a kind of down-the-hole drill gyroscope.
Background technology
Down-the-hole drill, is widely used in big, in, small mine, water power, the Rock excavation blasting engineering such as traffic, it is also possible in harbour, the subaqueous rock perforated blasting such as navigation channel.
Wherein, the gyroscope of one of this down-the-hole drill critical piece, its effect is to provide rotary power and propulsive force to drilling rod and drill bit, drives drilling tool to rotate impact type rock-breaking drilling.
But, the gear shaft of traditional gyroscope is directly installed with drilling rod adaptation by reducing sleeve, when rig works, the output gear shaft of gyroscope except while providing rotary power and propulsive force to drilling tool, the very big high frequency anti-force that the output gear of gyroscope and the bearing of adaptation thereof produce when will bear rock broken from impact drilling tool, easily cause gyroscope to lose efficacy and damaged, have a strong impact on the normal operation of down-the-hole drill.It addition, the connecting portion of drilling rod and reducing sleeve can deform because of the effect of anti-force, cause and be difficult to connecting and disconnecting drill rod, increase labor intensity, be less useful for maintaining.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art; a kind of compact conformation is provided, easy to operate and can the recoil strength of effective cushioned drill bit; the protection parts such as gear shaft, bearing; guarantee that down-the-hole drill is properly functioning, shorten the drilling rod Telescopic buffer device that effective engineering time saves again the gyroscope of cost.
The goal of the invention of the present invention is achieved in that the drilling rod Telescopic buffer device of a kind of down-the-hole drill gyroscope, including drilling rod telescopic assembly, described drilling rod telescopic assembly includes tie-plate, locking nut, expansion sleeve, telescopic, telescopic joint, shockproof glue based and guide duct, described tie-plate adaptation is arranged on the axle head of gyroscope output gear shaft, the inner chamber of described telescopic slidably connects telescopic joint, it is provided with, between described gyroscope gear shaft and telescopic joint, the buffer cavity that high pressure air can be stored and form high-pressure buffer air cushion, it is provided with shockproof glue based in described buffer cavity, described guide duct is coaxially installed on the outfan of gyroscope gear shaft and the sliding end of telescopic joint respectively through shockproof glue based centre bore and its two ends.
Being optimized according to above-mentioned, described tie-plate matches on the outfan being fixedly sheathed in gyroscope gear shaft, and telescopic matches and is installed on tie-plate.
It is optimized according to above-mentioned, described telescopic joint has the sliding end that slip cap is loaded on the inner chamber of telescopic and the elongation end extended to outside telescopic, the internal face of telescopic joint elongation end is provided with tapered thread, is provided with the central through hole for installing guide duct in telescopic joint.
Being optimized according to above-mentioned, described telescopic outer rim is provided with grease nipple, and grease nipple is communicated in telescopic.
Being optimized according to above-mentioned, the outer rim of described telescopic joint sliding end is provided with guide runner, is provided with gathering sill in described telescopic, and guide runner and gathering sill match and be slidably connected.
Being optimized according to above-mentioned, described shockproof glue based outer rim is provided with guide pad, and guide pad matched in clearance is in gathering sill.
It is optimized according to above-mentioned, the outfan of described gyroscope gear shaft and the endoporus of the sliding end of the telescopic joint of the coaxial plug-in mounting of guide duct is respectively equipped with cannelure, in cannelure, is equipped with sealing ring.
It is optimized according to above-mentioned, described locking nut is sleeved in tie-plate and adaptation is installed on the outfan of gyroscope gear shaft, the outfan of gyroscope gear shaft is connected by its external screw thread being provided with and locking nut are fixing, described locking nut is that annular is arranged, and which is provided with opening position, adaptive equipped with lock-screw in the both sides of described opening position.
Being optimized according to above-mentioned, described expansion sleeve is sleeved in tie-plate and adaptation is installed on the outfan of gyroscope gear shaft.
It is optimized according to above-mentioned, the periphery wall of described telescopic is provided with several installing holes, the periphery wall of tie-plate is provided with several connecting holes corresponding with installing hole, telescopic is provided with the bolt of plug-in mounting installing hole and connecting hole successively, and bolt adaptation is provided with the nut that tie-plate, telescopic can be made to fixedly mount.
The beneficial effects of the present invention is: be located at turn around between device gear shaft terminal and telescopic joint sliding end in the telescopic of this drilling rod Telescopic buffer device and be provided with one section of buffer cavity closed, quakeproof rubber pad it is provided with in buffer cavity, when down-the-hole drill normal operation, it is filled with high pressure air in the buffer cavity closed, constitute high-pressure buffer air cushion, can effectively absorb the anti-force being transmitted to by drilling tool through telescopic joint, add the cushioning effect of the quakeproof rubber pad being arranged in this buffer cavity again, rig gyroscope is made to obtain double buffering protection, effectively slow down the drilling rod anti-force to gyroscope gear shaft, extend the service life of gyroscope, simultaneously, the compact conformation of described drilling rod Telescopic buffer device, dismounting is with easy to maintenance, guarantee the normal use of down-the-hole drill, shorten effective engineering time, save use cost.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of present pre-ferred embodiments.
Accompanying drawing 2 is the front view of present pre-ferred embodiments.
Accompanying drawing 3 is the sectional view of present pre-ferred embodiments.
Accompanying drawing 4 is the sectional view (removing shockproof glue based) of present pre-ferred embodiments.
Accompanying drawing 5 is the exploded view (saving part bolts and nuts) of present pre-ferred embodiments.
Accompanying drawing 6 is the structural representation of present pre-ferred embodiments locking nut.
Accompanying drawing 7 is the structural representation that present pre-ferred embodiments is shockproof glue based.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to the accompanying drawings shown in 1 to Fig. 7, the drilling rod Telescopic buffer device of the down-the-hole drill gyroscope of the present invention, described drilling rod Telescopic buffer device includes drilling rod telescopic assembly.Described drilling rod telescopic assembly include tie-plate 1, locking nut 10, expansion sleeve 15, telescopic 2, telescopic joint 4, shockproof glue based 7 and guide duct 8.Described locking nut 10, expansion sleeve 15 are set in tie-plate 1 and adaptation is installed on the outfan of gyroscope gear shaft 3.Tie-plate 1 adaptation of described drilling rod telescopic assembly rear end is arranged on the axle head of gyroscope output gear shaft 3, the inner chamber of described telescopic 2 slidably connects telescopic joint 4, it is provided with buffer cavity 5 between described gyroscope gear shaft 3 and telescopic joint 4, being provided with shockproof glue based 7 in described buffer cavity 5, described guide duct 8 is coaxially installed on the outfan of gyroscope gear shaft 3 and the sliding end of telescopic joint 4 respectively through centre bore and its two ends of shockproof glue based 7.Described tie-plate 1 matches on the outfan being fixedly sheathed in gyroscope gear shaft 3, and telescopic 2 matches and is installed on tie-plate 1.
When down-the-hole drill normal operation; it is filled with high pressure air in the buffer cavity 5 closed; constitute high-pressure buffer air cushion; can effectively absorb the anti-force being transmitted to by drilling tool through telescopic joint; add the cushioning effect of the quakeproof rubber pad being arranged in this buffer cavity again; make rig gyroscope obtain double buffering protection, effectively slow down the drilling rod anti-force to gyroscope gear shaft, extend the service life of gyroscope.
With reference to shown in Fig. 3 to Fig. 6, the outfan of described gyroscope gear shaft 3 is provided with external screw thread, and locking nut 10 is fixing with external screw thread to be connected.Wherein, described locking nut 10 is arranged in annular, and locking nut 10 is provided with opening position 18, adaptive equipped with lock-screw in the both sides of described opening position 18, thus realizing drilling rod telescopic unit firmly to be installed on the stable connection on the outfan of gyroscope gear shaft 3, between strengthening part.
Additionally; the outfan of described gyroscope gear shaft 3 and the endoporus of the sliding end of the telescopic joint 4 of the coaxial plug-in mounting of guide duct 8 are respectively equipped with cannelure 13; it is equipped with sealing ring 9 in cannelure 13, strengthens the air-tightness of buffer cavity 5, it is ensured that the buffering effect of buffer cavity.
With reference to shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 7, being provided with central through hole in described telescopic joint 4, guide duct 8 is installed on central through hole.The outer rim of telescopic joint 4 sliding end is provided with guide runner 11, is provided with gathering sill 12 in described telescopic 2, and guide runner 11 and gathering sill 12 match and be slidably connected.And, the described outer rim of shockproof glue based 7 is provided with guide pad 20, and guide pad 20 matched in clearance is in gathering sill 12.Compact conformation, strengthens operation stability, improves the use quality of down-the-hole drill.
With reference to shown in Fig. 3 to Fig. 4, described telescopic joint 4 has the sliding end on the inner chamber that slip cap is loaded on telescopic 2 and the elongation end extended to outside telescopic 2, and telescopic joint 4 extends the internal face of end and is provided with tapered thread 14.Utilize tapered thread 14, the drilling rod of different size class shape is installed for adaptation, strengthen steadiness is installed, facilitate unloading drilling rod simultaneously, simple to operate, time saving and energy saving, it is easy to maintenance.
Shown in Fig. 5, the periphery wall of described telescopic 2 is provided with several installing holes 19, and the periphery wall of tie-plate 1 is provided with several connecting holes corresponding with installing hole 19 21.Telescopic 2 is provided with plug-in mounting installing hole 19 and the bolt 16 of connecting hole 21 successively, equipped with the nut 17 installed adaptive with bolt 16 on tie-plate 1, makes tie-plate 1, telescopic 2 install firm, can conveniently dismantle again, it is easy to safeguards and change.
With reference to shown in Fig. 2 to Fig. 5, described telescopic 2 outer rim is provided with grease nipple 6, and grease nipple 6 is communicated in telescopic 2.Grease nipple 6 is utilized to increase butter or other lubricating oil in retractor device.Maintain easily and maintenance, improve the performance of retractor device, extend its service life.
Claims (10)
- null1. the drilling rod Telescopic buffer device of a down-the-hole drill gyroscope，Including drilling rod telescopic assembly，It is characterized in that: described drilling rod telescopic assembly includes tie-plate (1)、Locking nut (10)、Expansion sleeve (15)、Telescopic (2)、Telescopic joint (4)、Shockproof glue based (7) and guide duct (8)，Described tie-plate (1) adaptation is arranged on the axle head of gyroscope output gear shaft (3)，The inner chamber of described telescopic (2) slidably connects telescopic joint (4)，It is provided with, between described gyroscope gear shaft (3) and telescopic joint (4), the buffer cavity (5) that high pressure air can be stored and form the closing of high-pressure buffer air cushion，It is provided with shockproof glue based (7) in described buffer cavity (5)，Described guide duct (8) is coaxially installed on the outfan of gyroscope gear shaft (3) and the sliding end of telescopic joint (4) respectively through centre bore and its two ends of shockproof glue based (7).
- 2. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 1, it is characterised in that: described tie-plate (1) matches on the outfan being fixedly sheathed in gyroscope gear shaft (3), and telescopic (2) matches and is installed on tie-plate (1).
- 3. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 2, it is characterized in that: the sliding end that described telescopic joint (4) has slip cap to be loaded on the inner chamber of telescopic (2) and extend to telescopic (2) elongation end outward, the internal face of telescopic joint (4) elongation end is provided with tapered thread (14), is provided with the central through hole for installing guide duct (8) in telescopic joint (4).
- 4. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 3, it is characterised in that: described telescopic (2) outer rim is provided with grease nipple (6), and grease nipple (6) is communicated in telescopic (2).
- 5. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 3, it is characterized in that: the outer rim of described telescopic joint (4) sliding end is provided with guide runner (11), being provided with gathering sill (12) in described telescopic (2), guide runner (11) and gathering sill (12) match and are slidably connected.
- 6. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 5, it is characterised in that: the outer rim of described shockproof glue based (7) is provided with guide pad (20), and guide pad (20) matched in clearance is in gathering sill (12).
- 7. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 1, it is characterized in that: the outfan of described gyroscope gear shaft (3) and the endoporus of the sliding end of the telescopic joint (4) of guide duct (8) coaxial plug-in mounting are respectively equipped with cannelure (13), in cannelure (13), are equipped with sealing ring (9).
- 8. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to any one of claim 1 to 7, it is characterized in that: described locking nut (10) is sleeved in tie-plate (1) and adaptation is installed on the outfan of gyroscope gear shaft (3), the outfan of gyroscope gear shaft (3) is connected by its external screw thread being provided with and locking nut (10) are fixing, described locking nut (10) is arranged in annular, and which is provided with opening position (18), adaptive equipped with lock-screw in the both sides of described opening position (18).
- 9. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 8, it is characterised in that: described expansion sleeve (15) is sleeved in tie-plate (1) and adaptation is installed on the outfan of gyroscope gear shaft (3).
- 10. the drilling rod Telescopic buffer device of down-the-hole drill gyroscope according to claim 2, it is characterized in that: the periphery wall of described telescopic (2) is provided with several installing holes (19), the periphery wall of tie-plate (1) is provided with the connecting hole (21) that several are corresponding with installing hole (19), telescopic (2) is provided with the bolt (16) of plug-in mounting installing hole (19) and connecting hole (21) successively, and bolt (16) adaptation is provided with the nut (17) that tie-plate (1), telescopic (2) can be made to fixedly mount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610095756.8A CN105804671B (en) | 2016-06-03 | 2016-06-03 | A kind of drilling rod Telescopic buffer device of down-the-hole drill gyrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610095756.8A CN105804671B (en) | 2016-06-03 | 2016-06-03 | A kind of drilling rod Telescopic buffer device of down-the-hole drill gyrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105804671A true CN105804671A (en) | 2016-07-27 |
| CN105804671B CN105804671B (en) | 2018-09-18 |
Family
ID=56465796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610095756.8A Active CN105804671B (en) | 2016-06-03 | 2016-06-03 | A kind of drilling rod Telescopic buffer device of down-the-hole drill gyrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105804671B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354971A (en) * | 2022-09-05 | 2022-11-18 | 鲁东大学 | Petroleum machinery installation drilling tool |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991834A (en) * | 1975-07-07 | 1976-11-16 | Curington Alfred R | Sampling airhammer apparatus |
| CN101864907A (en) * | 2010-05-26 | 2010-10-20 | 北京市三一重机有限公司 | Vibration damper and downhole drill comprising the same |
| CN102083753A (en) * | 2008-07-07 | 2011-06-01 | 旭硝子株式会社 | Core-shell particle and method for producing core-shell particle |
| CN203716838U (en) * | 2014-01-22 | 2014-07-16 | 江苏省无锡探矿机械总厂有限公司 | Rotor power head with buffer device |
| CN204804688U (en) * | 2015-05-20 | 2015-11-25 | 邹叔仪 | It changes integrative hydraulic pressure down -hole drill to dash |
| CN205400613U (en) * | 2016-06-03 | 2016-07-27 | 广东顺德孔山重工机械有限公司 | Telescopic buffer of drilling rod that down -hole drill clinostat was used |
-
2016
- 2016-06-03 CN CN201610095756.8A patent/CN105804671B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991834A (en) * | 1975-07-07 | 1976-11-16 | Curington Alfred R | Sampling airhammer apparatus |
| CN102083753A (en) * | 2008-07-07 | 2011-06-01 | 旭硝子株式会社 | Core-shell particle and method for producing core-shell particle |
| CN101864907A (en) * | 2010-05-26 | 2010-10-20 | 北京市三一重机有限公司 | Vibration damper and downhole drill comprising the same |
| CN203716838U (en) * | 2014-01-22 | 2014-07-16 | 江苏省无锡探矿机械总厂有限公司 | Rotor power head with buffer device |
| CN204804688U (en) * | 2015-05-20 | 2015-11-25 | 邹叔仪 | It changes integrative hydraulic pressure down -hole drill to dash |
| CN205400613U (en) * | 2016-06-03 | 2016-07-27 | 广东顺德孔山重工机械有限公司 | Telescopic buffer of drilling rod that down -hole drill clinostat was used |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354971A (en) * | 2022-09-05 | 2022-11-18 | 鲁东大学 | Petroleum machinery installation drilling tool |
| CN115354971B (en) * | 2022-09-05 | 2024-01-26 | 鲁东大学 | Petroleum machinery installs drilling tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105804671B (en) | 2018-09-18 |
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| CP01 | Change in the name or title of a patent holder |
Address after: 528322 No. 3-1-2, Fu'an Industrial Zone, leliulian Du Village, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong Kongshan Heavy Industry Machinery Co.,Ltd. Address before: 528322 No. 3-1-2, Fu'an Industrial Zone, leliulian Du Village, Shunde District, Foshan City, Guangdong Province Patentee before: GUANGDONG SHUNDE KOSAN HEAVY INDUSTRY MACHINERY CO.,LTD. |
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Effective date of registration: 20230619 Address after: No. 68, Zheda Road, Jianchi Street, Longquan City, Lishui City, Zhejiang Province 323700 Patentee after: Zhejiang Kongshan Heavy Industry Machinery Co.,Ltd. Address before: 528322 No. 3-1-2, Fu'an Industrial Zone, leliulian Du Village, Shunde District, Foshan City, Guangdong Province Patentee before: Guangdong Kongshan Heavy Industry Machinery Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A telescopic buffer device for drill pipes used in the rotary device of a down-hole drilling rig Effective date of registration: 20231101 Granted publication date: 20180918 Pledgee: Longquan Branch of China Construction Bank Co.,Ltd. Pledgor: Zhejiang Kongshan Heavy Industry Machinery Co.,Ltd. Registration number: Y2023980063343 |