CN103362437A - Portal frame type core drilling machine - Google Patents
Portal frame type core drilling machine Download PDFInfo
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- CN103362437A CN103362437A CN2013103273650A CN201310327365A CN103362437A CN 103362437 A CN103362437 A CN 103362437A CN 2013103273650 A CN2013103273650 A CN 2013103273650A CN 201310327365 A CN201310327365 A CN 201310327365A CN 103362437 A CN103362437 A CN 103362437A
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- gyrator
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- frame column
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Abstract
The invention discloses a portal frame type core drilling machine which comprises a base and a core drilling machine body, wherein the core drilling machine body comprises a machine seat; an orifice seat is arranged on the front part of the machine seat; portal frame vertical columns are arranged on two sides of the orifice seat; a transmission shaft is arranged between the back sides of the portal frame vertical columns; a gyrator is arranged at the lower end of the transmission shaft; a hinging shaft is arranged on the upper part of a butting surface between the gyrator and a transfer case body; a locking mechanism is arranged on the lower part of the butting surface between the gyrator and the transfer case body; lifting oil cylinders with power heads are respectively arranged in the two portal frame vertical columns; power head fixing seats are arranged on the lower parts of cylinder bodies of the lifting oil cylinders; oil cylinder guide mechanisms are arranged on the tops of the portal frame vertical columns; power head guide mechanisms matched with the portal frame vertical columns are respectively arranged on the left side and the right side of a power head box body. The portal frame type core drilling machine is easy to operate and low in manufacturing cost, realizes the advantage of long drilling travel of a hydraulic core drilling machine, has a mechanical transmission function of a vertical shaft type core drilling machine, guarantees the performance stability of equipment and improves the drilling efficiency.
Description
Technical field
The present invention relates to a kind of engineer geological prospecting equipment, particularly a kind of gantry type rock-core borer.
Background technology
Since 2006, State Council promulgated since " Resolution on Strengthen Geological Work ".China's mining industry is recovered rapidly, the geological core drilling rapid growth, and the input of mineral exploration is corresponding continuing to increase also.Along with progress and the development of society, the demand in market also changes various, so technological development needs constantly innovation, could satisfy the market demand that development changes.Take a broad view of probing market, a feast for the eyes multi-form core prospecting drill.Be nothing but two large types, one is spindle-type core drill, and stable performance is simple to operate, and shortcoming is that to creep into stroke little, i.e. the unit head backhaul distance of creeping into can't satisfy the length of a borehole wire-line coring drilling rod; Its two, be the all-hydraulic power head formula rock-core borer that grew up in recent years, on exploration market, also occupy certain share.The sharpest edges of all-hydraulic power head formula rock-core borer are that to creep into stroke long.Be the backhaul distance that unit head creeps into, can satisfy the length of a rope coring drill pipe.With respect to creeping into for the stroke of spindle-type core drill, stroke has increased about three times, and is single on this point, greatly improved the drilling efficiency of rig.Its shortcoming is: 1. manufacturing cost is higher, and price is relatively costly, and price is same size, approaches spindle-type core drill price doubly a lot of of configuration.Especially, the price of import all-hydraulic power head formula rock-core borer is expensive surprising especially.Its price is the double-digit multiple of spindle-type core drill price.This price, domestic most troops of visiting are difficult to bear; 2. power loss is large, and oil consumption is large.Because the torsion pass of all-hydraulic power head formula rock-core borer, to drive oil pump by diesel engine, drive motor by the hydraulic oil of oil pump output and pass to unit head and come torsion pass, like this, be converted to hydraulic energy by mechanical energy, be converted to again the process of mechanical energy by hydraulic energy, lose some power, added the fast smaller of unit head self, passed to the moment of torsion of rig load end, reach the required moment of torsion of the dark specification of certain brill, diesel engine power must be strengthened.We take the vertical shaft type of same size drilling ability (moment of torsion that refers to load end) and the rock-core borer of all-hydraulic power head formula to make comparisons, the torsion pass of spindle-type core drill, that diesel engine directly drives the gearbox deceleration by clutch, transfer case slows down and gyrator slows down, pass to the load of rig through multi-stage speed-reducing, whole system is gear drive, the relative power loss is less, system slowdown is than large, the load end moment of torsion is larger, all-hydraulic power head formula rock-core borer and the spindle-type core drill of close specification are made comparisons, the power power that the all-hydraulic power head formula is joined, be more than the twice of the spindle-type core drill power power of joining, power investment and the power cost that consumes energy is all higher; 3. rope speed is slow under the hoist engine, the hoist engine of all-hydraulic core drilling rig, hydraulically powered, when drill down operator, do not possess the ability of the movement of falling object when boring under the drilling tool, running speed is slower relatively, and the hoist engine of vertical shaft type rock-core borer, owing to possessing the ability of the movement of falling object, running speed is very fast during lower boring, and controllability is strong again.Can realize the long stroke drilling ability of all-hydraulic core drilling rig so urgent need is a kind of on the market now, can realize the spindle-type core drill machine driving again, can improve the rock-core borer of exploration drilling efficiency.
Summary of the invention
The technical problem to be solved in the present invention is for the deficiencies in the prior art, proposes a kind of long stroke of all-hydraulic unbearable rig of can realizing and creeps into, and possesses again the spindle-type core drill machine driving, can reduce cost, improves the gantry type rock-core borer of equipment drilling efficiency.
The technical problem to be solved in the present invention is achieved through the following technical solutions, a kind of gantry type rock-core borer, comprise base and rock-core borer body, on the slideway that is contained in base that the rock-core borer body slides, described rock-core borer body comprises support, be provided with power assembly at support, power assembly is through clutch gearbox, universal transmission system and transfer case join, above universal transmission system, be provided with the hoist engine assembly that joins with transfer case, be characterized in: be provided with the aperture seat in the front portion of support, be arranged with two vertical door frame columns that arrange in the left and right sides of aperture seat, the lower end of door frame column and aperture seat are hinged by bearing pin, the top of two door frame columns joins by tie-beam, in the middle of the rear of door frame column, be provided with the power transmission shaft that be arranged in parallel with the door frame column, the upper end of power transmission shaft joins with two door frame columns respectively by wing jib, be provided with the gyrator that docks with transfer case in the lower end of power transmission shaft, in gyrator, be provided with the bevel gear wheel that is sleeved on the power transmission shaft bottom, output shaft at transfer case is provided with the bevel pinion that meshes with above-mentioned bevel gear wheel, interface top between gyrator and transfer case body is provided with the jointed shaft of horizontally set, interface bottom between gyrator and transfer case body is provided with retaining mechanism, the both sides of gyrator join by jib body and two door frame columns, between jib body and aperture seat the frame oil cylinder have been housed; The hoist cylinder of unit head all is installed in the inside of two door frame columns, the piston rod of hoist cylinder arranges down, the piston-rod lower end of hoist cylinder is provided with the Connection Block that is connected with the bottom of door frame column, in the bottom of hoist cylinder cylinder body the unit head holder is housed, is provided with the oil cylinder guiding mechanism that cooperates with the hoist cylinder cylinder body on the top of door frame column; The piston rod of described hoist cylinder is made of inner and outer tubes, inner tube communicates with the rodless cavity of hoist cylinder, between inner tube and outer tube, be set to the oil inlet passage that communicates with rod chamber, the Connection Block that joins at piston rod and door frame column is provided with hydraulic oil interface I, II, hydraulic oil interface I communicates with inner tube, hydraulic oil interface II communicates with oil inlet passage between the inner and outer pipes, in the casing of unit head, be provided with the drive sleeve that cooperates with power transmission shaft, in drive sleeve the conduit gear is housed, the conduit gear joins by the gear wheel of intermediate drive gear and unit head, be respectively equipped with the unit head guiding mechanism that cooperates with the door frame column in the left and right sides of unit head casing, during transportation, open retaining mechanism, take off simultaneously the lower end of door frame column and the bearing pin between the seat of aperture, plaing under the effect of frame oil cylinder, gyrator separates with transfer case, two door frame columns, unit head and gyrator are turned over along the jointed shaft on gyrator and transfer case body top; In the time of need to creeping into, plaing a part under the frame oil cylinder, two door frame columns, unit head and gyrator overturn forward along the jointed shaft on gyrator and transfer case body top, gyrator docks with transfer case, with gyrator and transfer case locking, plug simultaneously the lower end of door frame column and the bearing pin between the seat of aperture by retaining mechanism.
The technical problem to be solved in the present invention can also be come further realization by the following technical programs, and described oil cylinder guiding mechanism is two guide rollers that cooperate with the hoist cylinder cylinder body that are contained in door frame column top.
The technical problem to be solved in the present invention can also be come further realization by the following technical programs, and described retaining mechanism is the lock bolt that is hinged on the gyrator, is provided with locking nut at lock bolt, and transfer case is provided with the locking bayonet socket that cooperates with lock bolt.
The technical problem to be solved in the present invention can also be come further to realize by the following technical programs, described unit head guiding mechanism comprises the fixedly boxboard that is arranged on the unit head both sides, be provided with at least one group of roller that arranges along former and later two sides of door frame column at fixing boxboard, the rotating shaft of roller and the adjusting device that fixedly is provided with adjustment roller and door frame column gap between the boxboard.
The technical problem to be solved in the present invention can also be come further to realize by the following technical programs, described adjusting device is included in the adjusting slotted hole of the installation roller wheel shaft that arranges on the fixing boxboard, is provided with and the vertically disposed adjusting bolt of the rotating shaft of roller at fixing boxboard.
The technical problem to be solved in the present invention can also be come further realization by the following technical programs, and described two hoist cylinders share a hydraulic lock.
The technical problem to be solved in the present invention can also be come further to realize by the following technical programs, supports the bracing frame of door frame column when being provided with transportation at the rear portion of support.
Compared with prior art, utilization of the present invention is installed in power assembly, clutch gearbox, universal transmission system, transfer case, gyrator and the unit head on the rock-core borer body support, make the gantry type rock-core borer possess the machine driving of spindle-type core drill, satisfied the performance parameters of using, made things convenient for operation, guarantee stability and the reliability of rig, reduced the cost of equipment; Utilization is installed in the hoist cylinder of the unit head of door frame column inside, the long stroke advantage of can realization equipment creeping into; Utilize the unit head holder unit head to be installed in the bottom of hoist cylinder cylinder body, and gyrator is joined by jib body and two door frame columns, so that two door frame columns, unit head and gyrators can be along the jointed shaft upsets on gyrator and transfer case body top, when equipment conveying, can reduce the shipping height of equipment, satisfy the requirement of travel position; Utilization is arranged on the unit head guiding mechanism that the left and right sides of unit head casing cooperates with the door frame column, has avoided the service wear of unit head, simultaneously, has guaranteed the stability when unit head creeps into, and has improved the drilling efficiency of equipment.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the right view of Fig. 1;
Fig. 3 is unit head lifting appliance structural representation;
Fig. 4 is the right view of Fig. 3;
Fig. 5 is the gyrator structures schematic diagram;
Fig. 6 is the left view of Fig. 5;
Fig. 7 power head structure schematic diagram;
Fig. 8 is the top view of Fig. 7.
The specific embodiment
A kind of gantry type rock-core borer, comprise base 3 and rock-core borer body, on the slideway that is contained in base 3 that the rock-core borer body slides, described rock-core borer body comprises support 2, be provided with power assembly 5 at support 2, power assembly 5 is through clutch gearbox 6, universal transmission system 8 joins with transfer case 9, above universal transmission system 8, be provided with the hoist engine assembly 7 that joins with transfer case 9, be provided with aperture seat 1 in the front portion of support 2, be arranged with two vertical door frame columns 13 that arrange in the left and right sides of aperture seat 1, the lower end of door frame column 13 and aperture seat 1 are hinged by bearing pin, the top of two door frame columns 13 joins by tie-beam 14, in the middle of the rear of door frame column 13, be provided with the power transmission shaft 11 that be arranged in parallel with door frame column 13, the upper end of power transmission shaft 11 joins with two door frame columns 13 respectively by wing jib 20, be provided with the gyrator 10 that docks with transfer case 9 in the lower end of power transmission shaft 11, in gyrator 10, be provided with the bevel gear wheel that is sleeved on power transmission shaft 11 bottoms, output shaft at transfer case 9 is provided with the bevel pinion that meshes with above-mentioned bevel gear wheel, interface top between gyrator 10 and transfer case body is provided with the jointed shaft 18 of horizontally set, interface bottom between gyrator 10 and transfer case body is provided with retaining mechanism 21, the both sides of gyrator 10 join by jib body 17 and two door frame columns 13, between jib body 17 and aperture seat 1 frame oil cylinder 16 have been housed; The hoist cylinder 25 of unit head all is installed in the inside of two door frame columns 13, the piston rod of hoist cylinder 25 arranges down, the piston-rod lower end of hoist cylinder 25 is provided with the Connection Block that is connected with the bottom of door frame column 13, in the bottom of hoist cylinder cylinder body unit head holder 19 is housed, is provided with the oil cylinder guiding mechanism 15 that cooperates with the hoist cylinder cylinder body on the top of door frame column 13; The piston rod of described hoist cylinder is made of inner and outer tubes, inner tube communicates with the rodless cavity of hoist cylinder, between inner tube and outer tube, be set to the oil inlet passage that communicates with rod chamber, the Connection Block that joins at piston rod and door frame column is provided with hydraulic oil interface I, II, hydraulic oil interface I communicates with inner tube, hydraulic oil interface II communicates with oil inlet passage between the inner and outer pipes, in the casing of unit head 12, be provided with the drive sleeve that cooperates with power transmission shaft 11, in drive sleeve the conduit gear is housed, the conduit gear joins by the gear wheel of intermediate drive gear and unit head, be respectively equipped with the unit head guiding mechanism that cooperates with door frame column 13 in the left and right sides of unit head casing, during transportation, open retaining mechanism, take off simultaneously the lower end of door frame column and the bearing pin between the aperture seat 1, plaing under 16 effects of frame oil cylinder, gyrator 10 separates with transfer case 9, two door frame columns 13, unit head 12 and gyrator 10 are turned over along gyrator 10 and the jointed shaft on transfer case body top; In the time of need to creeping into, playing the frame oil cylinder 16 times, two door frame columns 13, unit head 12 and gyrator 10 overturn forward along the jointed shaft 18 on gyrator and transfer case body top, gyrator docks with transfer case, with gyrator and transfer case locking, plug simultaneously the lower end of door frame column 13 and the bearing pin between the aperture seat 1 by retaining mechanism 21.The present invention had both realized the large stroke advantage of creeping into of all-hydraulic power head rock-core borer, inherited again the standby freely falling body of drilling tool under the mechanical type torsion pass mode, hoist engine assembly of spindle-type core drill dependable performance, fireballing advantage has been compiled the common advantage of two large type rigs.Simultaneously, also having reduced the cost of making, is the successively large leapfrog development of drilling equipment technological progress.
Described oil cylinder guiding mechanism 15 is for being contained in two guide rollers that cooperate with the hoist cylinder cylinder body on door frame column 13 tops.Described oil cylinder guiding mechanism 15 is whether necessary guarantee of steady operation of control hoist cylinder cylinder body shift motion.Described power transmission shaft upper limb jib 20 forms stable three-legged structure with tie-beam 14, has guaranteed that unit head moves the stability of creeping into.Described hydraulic oil interface I communicates with inner tube, and the rodless cavity that makes hydraulic oil enter hoist cylinder creeps into as decompression, and hydraulic oil interface II communicates with oil inlet passage between the inner and outer pipes, and the rod chamber that makes hydraulic oil enter hoist cylinder creeps into as pressurization.
Described retaining mechanism 21 is provided with locking nut for being hinged on the lock bolt on the gyrator at lock bolt, and transfer case is provided with the locking bayonet socket that cooperates with lock bolt.Described retaining mechanism 21 is provided with 2 and be symmetricly set on respectively the bottom of interface both sides between gyrator 10 and the transfer case body.In the time of in working order, gyrator docks with the casing of transfer case, after the bevel pinion in the transfer case and the bevel gear wheel engagement, by retaining mechanism 21 lockings; When travel position, bevel gear wheel separates with bevel pinion, and gyrator is turned over 90 °, in order to prevent being provided with the protection of flexible spherical dust cover by the pollution of dust etc.
Described unit head guiding mechanism comprises the fixedly boxboard that is arranged on the unit head both sides, be provided with at least one group of roller 23 that arranges along former and later two sides of door frame column at fixing boxboard, the rotating shaft of roller 23 and the adjusting device 24 that fixedly is provided with adjustment roller and door frame column gap between the boxboard; Described adjusting device 24 is included in the adjusting slotted hole of the installation roller wheel shaft that arranges on the fixing boxboard, is provided with and the vertically disposed adjusting bolt of the rotating shaft of roller at fixing boxboard.Described roller is provided with two groups, and the both sides of unit head 12 are equipped with altogether eight rollers.Utilize adjusting device 24 so that roller is made gapless rolling movement, described unit head casing is oil lubrication, and with the oild chuck mechanism 22 of the coaxial setting of power head output shaft be grease lubrication.
Described two hoist cylinders 25 share a hydraulic lock.Guarantee that the motion state of two hoist cylinders 25 when work is synchronous.In order to guarantee the parallelism of hoist cylinder cylinder body, should accomplish contour so buy the centre distance of two door frame columns and hoist cylinder as far as possible.
Support the bracing frame 4 of door frame column 13 when being provided with transportation at the rear portion of support 2.When equipment conveying, open retaining mechanism 21, take off simultaneously the lower end of door frame column 13 and the bearing pin between the seat of aperture, plaing under 16 effects of frame oil cylinder, gyrator 10 separates with transfer case, and two door frame columns 13, unit head and gyrator are turned over along the jointed shaft on gyrator and transfer case body top, utilizes bracing frame 4 to support door frame column 13, the shipping height of assurance equipment has satisfied the state that transports.
Claims (7)
1. gantry type rock-core borer, comprise base and rock-core borer body, on the slideway that is contained in base that the rock-core borer body slides, described rock-core borer body comprises support, be provided with power assembly at support, power assembly is through clutch gearbox, universal transmission system and transfer case join, above universal transmission system, be provided with the hoist engine assembly that joins with transfer case, it is characterized in that: be provided with the aperture seat in the front portion of support, be arranged with two vertical door frame columns that arrange in the left and right sides of aperture seat, the lower end of door frame column and aperture seat are hinged by bearing pin, the top of two door frame columns joins by tie-beam, in the middle of the rear of door frame column, be provided with the power transmission shaft that be arranged in parallel with the door frame column, the upper end of power transmission shaft joins with two door frame columns respectively by wing jib, be provided with the gyrator that docks with transfer case in the lower end of power transmission shaft, in gyrator, be provided with the bevel gear wheel that is sleeved on the power transmission shaft bottom, output shaft at transfer case is provided with the bevel pinion that meshes with above-mentioned bevel gear wheel, interface top between gyrator and transfer case body is provided with the jointed shaft of horizontally set, interface bottom between gyrator and transfer case body is provided with retaining mechanism, the both sides of gyrator join by jib body and two door frame columns, between jib body and aperture seat the frame oil cylinder have been housed; The hoist cylinder of unit head all is installed in the inside of two door frame columns, the piston rod of hoist cylinder arranges down, the piston-rod lower end of hoist cylinder is provided with the Connection Block that is connected with the bottom of door frame column, in the bottom of hoist cylinder cylinder body the unit head holder is housed, is provided with the oil cylinder guiding mechanism that cooperates with the hoist cylinder cylinder body on the top of door frame column; The piston rod of described hoist cylinder is made of inner and outer tubes, inner tube communicates with the rodless cavity of hoist cylinder, between inner tube and outer tube, be set to the oil inlet passage that communicates with rod chamber, the Connection Block that joins at piston rod and door frame column is provided with hydraulic oil interface I, II, hydraulic oil interface I communicates with inner tube, hydraulic oil interface II communicates with oil inlet passage between the inner and outer pipes, in the casing of unit head, be provided with the drive sleeve that cooperates with power transmission shaft, in drive sleeve the conduit gear is housed, the conduit gear joins by the gear wheel of intermediate drive gear and unit head, be respectively equipped with the unit head guiding mechanism that cooperates with the door frame column in the left and right sides of unit head casing
During transportation, open retaining mechanism, take off simultaneously the lower end of door frame column and the bearing pin between the seat of aperture, plaing under the effect of frame oil cylinder, gyrator separates with transfer case, and two door frame columns, unit head and gyrator are turned over along the jointed shaft on gyrator and transfer case body top; In the time of need to creeping into, plaing a part under the frame oil cylinder, two door frame columns, unit head and gyrator overturn forward along the jointed shaft on gyrator and transfer case body top, gyrator docks with transfer case, with gyrator and transfer case locking, plug simultaneously the lower end of door frame column and the bearing pin between the seat of aperture by retaining mechanism.
2. gantry type rock-core borer according to claim 1, it is characterized in that: described oil cylinder guiding mechanism is two guide rollers that cooperate with the hoist cylinder cylinder body that are contained in door frame column top.
3. gantry type rock-core borer according to claim 1, it is characterized in that: described retaining mechanism is the lock bolt that is hinged on the gyrator, is provided with locking nut at lock bolt, transfer case is provided with the locking bayonet socket that cooperates with lock bolt.
4. gantry type rock-core borer according to claim 1, it is characterized in that: described unit head guiding mechanism comprises the fixedly boxboard that is arranged on the unit head both sides, be provided with at least one group of roller that arranges along former and later two sides of door frame column at fixing boxboard, the rotating shaft of roller and the adjusting device that fixedly is provided with adjustment roller and door frame column gap between the boxboard.
5. gantry type rock-core borer according to claim 4 is characterized in that: described adjusting device is included in the adjusting slotted hole of the installation roller wheel shaft that arranges on the fixing boxboard, is provided with and the vertically disposed adjusting bolt of the rotating shaft of roller at fixing boxboard.
6. gantry type rock-core borer according to claim 1, it is characterized in that: described two hoist cylinders share a hydraulic lock.
7. gantry type rock-core borer according to claim 1 is characterized in that: the bracing frame that supports the door frame column when being provided with transportation at the rear portion of support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310327365.0A CN103362437B (en) | 2013-07-31 | 2013-07-31 | Portal frame type core drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310327365.0A CN103362437B (en) | 2013-07-31 | 2013-07-31 | Portal frame type core drilling machine |
Publications (2)
| Publication Number | Publication Date |
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| CN103362437A true CN103362437A (en) | 2013-10-23 |
| CN103362437B CN103362437B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310327365.0A Active CN103362437B (en) | 2013-07-31 | 2013-07-31 | Portal frame type core drilling machine |
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Cited By (5)
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| CN104818954A (en) * | 2015-05-27 | 2015-08-05 | 重庆探矿机械厂 | Vertical shaft type core drill |
| CN110685608A (en) * | 2019-11-01 | 2020-01-14 | 中陕核工业集团陕西二一〇研究所有限公司 | Long-stroke feeding mechanism of mechanical power head and operation method of long-stroke feeding mechanism |
| CN112324355A (en) * | 2020-11-18 | 2021-02-05 | 江苏省岩土工程勘察设计研究院 | Drilling device and drilling process for geotechnical engineering investigation |
| US10995563B2 (en) | 2017-01-18 | 2021-05-04 | Minex Crc Ltd | Rotary drill head for coiled tubing drilling apparatus |
| CN114562225A (en) * | 2022-02-28 | 2022-05-31 | 中国铁建重工集团股份有限公司 | Direction-adjustable core drill with simple sealing device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818954A (en) * | 2015-05-27 | 2015-08-05 | 重庆探矿机械厂 | Vertical shaft type core drill |
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| CN112324355A (en) * | 2020-11-18 | 2021-02-05 | 江苏省岩土工程勘察设计研究院 | Drilling device and drilling process for geotechnical engineering investigation |
| CN114562225A (en) * | 2022-02-28 | 2022-05-31 | 中国铁建重工集团股份有限公司 | Direction-adjustable core drill with simple sealing device |
| CN114562225B (en) * | 2022-02-28 | 2024-03-08 | 中国铁建重工集团股份有限公司 | Direction-adjustable core drill with simple sealing device |
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| Publication number | Publication date |
|---|---|
| CN103362437B (en) | 2015-07-08 |
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Effective date of registration: 20160214 Address after: 222000 Jiangsu, Haizhou District, Haizhou Development Zone, the new East Road, No. 1 Patentee after: H.H. DRILL-TECH DRILLING MACHINERY CO., LTD. Address before: 222000 Jiangsu, Haizhou District, Haizhou Development Zone, the new East Road, No. 1 Patentee before: Lianyungang Huanghai Machinery Co., Ltd. |