CN108625777B - Movable automatic drilling machine for bar planting drilling and construction method thereof - Google Patents
Movable automatic drilling machine for bar planting drilling and construction method thereof Download PDFInfo
- Publication number
- CN108625777B CN108625777B CN201810457524.1A CN201810457524A CN108625777B CN 108625777 B CN108625777 B CN 108625777B CN 201810457524 A CN201810457524 A CN 201810457524A CN 108625777 B CN108625777 B CN 108625777B
- Authority
- CN
- China
- Prior art keywords
- drilling
- percussion drill
- dust
- drill
- machine
- 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.)
- Active
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 142
- 238000010276 construction Methods 0.000 title claims abstract description 15
- 239000000428 dust Substances 0.000 claims description 65
- 238000009527 percussion Methods 0.000 claims description 55
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims 2
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
- E21B7/027—Drills for drilling shallow holes, e.g. for taking soil samples or for drilling postholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B1/00—Percussion drilling
- E21B1/02—Surface drives for drop hammers or percussion drilling, e.g. with a cable
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
Abstract
The invention discloses a movable automatic drilling machine for drilling holes in bar planting and a construction method thereof. The drilling machine is movable and high in automation degree, can quickly drill holes for planting the ribs on the bridge floor or the ground, and is suitable for large-area rib planting when the bridge floor or the ground is reinforced and reconstructed. The invention also discloses a construction method of the drilling machine.
Description
Technical Field
The invention relates to drilling equipment for bar planting drilling and a construction method thereof, in particular to a mobile automatic drilling machine for bar planting drilling and a construction method thereof.
Background
At present, in the prior art, the construction method adopted by the bar planting drilling during reinforcing and reconstructing the bridge deck or the ground mainly depends on a manual handheld percussion drill drilling mode, during operation, the manual handheld percussion drill is used for drilling at a designated lofting point of the bridge deck or the ground.
When the impact force of the impact drill acts on the bridge floor or the ground, the drilling depth is mainly controlled by the experience of workers, the drilling depth cannot be accurately controlled, the designed drilling depth can be achieved by frequently measuring the drilling depth for many times, and extra work is added in the measuring process.
The handheld impact drill is mainly used for drilling holes and depends on the operation of workers, the holes are drilled firstly, then dust is blown out, the labor intensity of the workers in the bending operation is high, the single-person operation efficiency is low, when the bridge floor or ground reinforcement transformation needs large-area bar planting, a large amount of repetitive work is needed by the handheld impact drill drilling process workers, the physical strength consumption is huge, and the overall construction efficiency is low.
Disclosure of Invention
One of the purposes of the invention is to provide a mobile automatic drilling machine for drilling holes for planting bars, which is mobile and has high automation degree, can rapidly drill holes for planting bars on a bridge floor or a ground, and is suitable for large-area bar planting during reinforcing and reconstructing the bridge floor or the ground.
The invention is realized by the following technical scheme: a portable automatic drilling machine for bar planting drilling, its characterized in that: the drilling machine comprises a machine body, a moving wheel, an impact drill, a stroke controller and an impact strength controller, wherein the moving wheel is installed at the lower part of the machine body and used for moving the drilling machine, a vertical slide rail is arranged on the side surface of the machine body, the impact drill is installed on the vertical slide rail in a sliding connection mode, so that the impact drill is integrated on the drilling machine, an air compressor and an air cylinder are further installed on the machine body, the air compressor is connected with the air cylinder, the air compressor drives the air cylinder to act, the impact drill is connected with the air cylinder, the impact drill can move up and down along the vertical slide rail under the driving of the air cylinder, the stroke controller and the impact strength controller are both installed on the machine body, the stroke controller and the impact strength controller are respectively connected with the impact drill and the air compressor, the stroke controller can sense and control the drilling depth of the impact drill, and send instructions to the impact drill and the air compressor when the impact drill enters the set drilling depth, make the percussion drill stop operation and make the air compressor machine upwards drive the percussion drill and return to the initial position when the percussion drill does not move down, percussion strength controller can the sensing percussion drill creep into the dynamics, run into at the percussion drill and lead to the percussion drill creep into the dynamics and be greater than the drilling dynamics of settlement and give out the instruction to percussion drill and air compressor machine when hard thing leads to the percussion drill to bore the dynamics and be greater than the drilling dynamics of settlement, make the percussion drill stop operation and make the air compressor machine upwards drive the percussion drill and return to the initial position when the percussion drill does not move down, thereby realize the automation mechanized operation of drilling machine, and can accurate control drilling depth.
In the invention, the impact drill is an existing impact drill and a common brand impact drill in the market, and the drilling machine and the drill bit can be freely replaced.
In the invention, the vertical slide rail is a cylindrical rail, the impact drill is provided with a roller sleeve matched with the vertical slide rail, the roller sleeve is sleeved with the vertical slide rail, and a bearing is arranged between the roller sleeve and the vertical slide rail.
In the invention, the moving wheels comprise a steering wheel positioned at the front part of the machine body and a positioning wheel positioned at the rear part of the machine body.
As an improvement of the invention, the drilling machine further comprises a dust suction device, the dust suction device comprises a dust collector and a dust bag, the dust collector and the dust bag are both positioned in the machine body, the dust collector is provided with a switch and a dust suction pipe externally arranged on the machine body, the dust collector sucks dust generated by drilling of the percussion drill through the dust suction pipe, and the sucked dust is stored in the dust bag.
The automatic drilling machine is suitable for drilling large-area steel bar planting on the bridge floor or the ground, a drilling point position is released on the bridge floor or the ground, the drilling machine is manually pushed to be in place, the switch is pressed down, the drilling machine is started, a drill rod is automatically pulled out after the drilling machine drills to a designed depth, the drilling machine is pushed forwards to the next hole position, and the dust suction pipe is inserted into the hole to suck away dust.
The invention also aims to provide the construction method of the mobile automatic drilling machine for drilling the embedded steel bars, which is easy to operate, can quickly drill the embedded steel bars on the bridge floor or the ground and is suitable for large-area embedded steel bars during reinforcing and reconstructing the bridge floor or the ground.
The invention is realized by the following technical scheme: the construction method for drilling by the mobile automatic drilling machine for drilling the embedded steel bars is characterized by comprising the following steps:
firstly, drilling and lofting on a bridge deck or ground;
secondly, aligning a percussion drill rod of the drilling machine to the lofting point for drilling;
and thirdly, performing dust collection and removal operation.
In the invention, the specific treatment process of the first step is as follows: and (4) drilling and lofting the bridge deck or the ground according to a design drawing.
In the invention, the specific treatment process of the second step is as follows: and selecting a proper drill rod according to the drilling depth requirement, and performing drilling operation after adjusting the stroke controller.
In the invention, the specific treatment process of the third step is as follows: the drilling machine is moved away after drilling, the dust suction pipe is inserted into the hole to suck dust, and then the dust suction pipe is used for cleaning dust around the hole.
Compared with the prior art, the invention has the following remarkable effects:
(1) after the automatic drilling machine provided by the invention sets the drilling depth, the drilling machine is started, and the percussion drill drilling machine can automatically drill to the set drilling depth without manually holding the percussion drill to bow and measure the drilling depth.
(2) The automatic drilling machine can automatically return to the original position when the drill bit drills to the specified hole depth and meets hard media such as reinforcing steel bars and the like which are different from concrete, so that the impact drill is prevented from being damaged by drill clamping.
(3) The automatic drilling machine can conveniently insert the dust suction pipe into the drilled hole to suck away dust after the drilling is finished, so that the hole cleaning is finished immediately, and the operation efficiency is improved.
(4) When the bridge floor or ground is reinforced and reformed and needs large-area bar planting, the automatic drilling machine can be used for fast operation, and the labor intensity of workers is greatly reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall structure of an automatic drilling machine according to the present invention;
FIG. 2 is a schematic view of the spot setting and lofting of the bar planting drilling hole when the automatic drilling machine of the present invention is in use;
FIG. 3 is a schematic view of the automatic drilling machine of the present invention in a position to move to a stocking point;
FIG. 4 is a schematic view of the drilling process of the automatic drilling machine of the present invention;
FIG. 5 is a schematic view of the drilling operation of the automatic drilling machine of the present invention;
FIG. 6 is a schematic view of the operation of the dust suction device in the automatic drilling machine according to the present invention;
fig. 7 is a schematic view of the automatic drilling machine of the present invention after drilling is completed.
Description of the reference numerals
1. Percussion drilling; 2. A cylinder;
3. rolling; 4. A bearing;
5. a stroke controller; 6. An impact force controller;
7. an air compressor; 8. An air compressor motor;
9. a line control box; 10. A switch;
11. a vacuum cleaner; 12. A dust bag;
13. a housing chamber; 14. A dust collection pipe;
15. a handrail; 16. A steering wheel;
17. and (5) positioning the wheel.
Detailed Description
As shown in fig. 1 to 7, the mobile automatic drilling machine for drilling the embedded steel bars comprises a machine body, a mobile wheel, a percussion drill 1, a stroke controller 5 and a percussion strength controller 6, wherein the mobile wheel is installed at the lower part of the machine body and used for moving the drilling machine, a vertical slide rail is arranged on the side surface of the machine body, and the percussion drill 1 is installed on the vertical slide rail in a sliding connection manner, so that the percussion drill 1 is integrated on the drilling machine.
The machine body is also provided with an air compressor 7 and an air cylinder 2, the air compressor 7 is provided with an air compressor motor 8, the air compressor 7 is connected with the air cylinder 2, the air compressor 7 drives the air cylinder 2 to act, the impact drill 1 is connected with the air cylinder 2, the impact drill 1 can move up and down along a vertical sliding rail under the driving of the air cylinder, the stroke controller 5 and the impact strength controller 6 are both arranged on the machine body, the stroke controller 5 and the impact strength controller 6 are respectively connected with the impact drill 1 and the air compressor 7, the stroke controller 5 can sense and control the drilling depth of the impact drill 1, when the impact drill 1 enters the set drilling depth, an instruction is sent to the impact drill 1 and the air compressor 7, so that the impact drill 1 stops working and the air compressor 7 drives the impact drill 1 upwards to return to the initial position when the impact drill 1 does not move downwards, and the impact strength controller 6 can sense the drilling strength of the impact drill 1, when the impact drill 1 encounters a hard object such as a steel bar different from concrete, the drilling force of the impact drill 1 is larger than the set drilling force, an instruction is sent to the impact drill 1 and the air compressor 7, so that the impact drill 1 stops working and the air compressor 7 drives the impact drill 1 upwards to return to the initial position of the impact drill 1 when the impact drill 1 does not move downwards, the automatic operation of the drilling machine is realized, and the drilling depth can be accurately controlled.
In this embodiment, percussion drill 1 is current percussion drill 1, and vertical slide rail is the cylindrical rail, and percussion drill 1 has the roller 3 with vertical slide rail looks adaptation, and 3 suit vertical slide rails of roller still are provided with bearing 4 between roller 3 and the vertical slide rail.
In this embodiment, the moving wheels include a steering wheel 16 at the front of the body and a positioning wheel 17 at the rear of the body.
The drilling machine of the embodiment further comprises a dust suction device, the dust suction device comprises a dust collector 11 and a dust bag 12, the dust collector 11 and the dust bag 12 are both located in the machine body, the dust collector 11 is provided with a switch 10 and a dust suction pipe 14 which is externally arranged on the machine body, the dust collector 11 sucks dust generated by drilling the hole of the percussion drill 1 through the dust suction pipe 14, the sucked dust is stored in the dust bag 12, and the dust bag 12 can be replaced.
The construction method for drilling by the mobile automatic drilling machine for bar planting drilling comprises the following steps:
firstly, drilling and lofting on a bridge deck or ground;
the specific treatment process of the first step is as follows: and (4) drilling and lofting the bridge deck or the ground according to a design drawing.
Secondly, aligning a percussion drill rod of the drilling machine to the lofting point for drilling;
the second step comprises the following specific treatment processes: and selecting a proper drill rod according to the drilling depth requirement, and performing drilling operation after adjusting the stroke controller.
And thirdly, performing dust collection and removal operation.
The third step comprises the following specific treatment processes: the drilling machine is moved away after drilling, the dust suction pipe is inserted into the hole to suck dust, and then the dust suction pipe is used for cleaning dust around the hole.
After the automatic drilling machine of the invention sets the drilling depth, the stroke controller is started, the percussion drill can automatically drill to the set drilling depth without manually holding the percussion drill to bend down and measure the drilling depth; when the drill bit of the automatic drilling machine drills to a specified hole depth and meets the media different from concrete, such as reinforcing steel bars and the like, the impact drill can automatically return to the original position so as to prevent the impact drill from being damaged by drill clamping; after the automatic drilling machine finishes drilling, the dust suction pipe can be conveniently inserted into the drilled hole to suck away dust, so that hole cleaning is finished immediately, and the operation efficiency is improved; when the bridge floor or ground is reinforced and reformed and needs large-area bar planting, the automatic drilling machine can be used for fast operation, and the labor intensity of workers is greatly reduced.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (8)
1. A portable automatic drilling machine for bar planting drilling, its characterized in that: the drilling machine comprises a machine body, a moving wheel, a percussion drill, a stroke controller and a percussion strength controller, wherein the moving wheel is arranged at the lower part of the machine body and used for moving the drilling machine, a vertical slide rail is arranged on the side surface of the machine body, the percussion drill is arranged on the vertical slide rail in a sliding connection mode so as to integrate the percussion drill on the drilling machine, the machine body is also provided with an air compressor and an air cylinder, the air compressor is connected with the air cylinder, the air compressor drives the air cylinder to act, the percussion drill is connected with the air cylinder, the percussion drill can move up and down along the vertical slide rail under the driving of the air cylinder, the vertical slide rail is a cylindrical rail, the percussion drill is provided with a rolling sleeve matched with the vertical slide rail, the vertical slide rail is sleeved with the rolling sleeve, a bearing is also arranged between the rolling sleeve and the vertical slide rail, the stroke controller and the percussion strength controller are both arranged on the machine body, and the stroke controller and percussion strength controller are respectively connected with the percussion drill and the air compressor, the stroke controller can sense and control the drilling depth of the percussion drill, and sends an instruction to the percussion drill and the air compressor when the percussion drill enters the set drilling depth, so that the percussion drill stops working and the air compressor upwards drives the percussion drill to return to the initial position when the percussion drill does not move downwards, the impact strength controller can sense the drilling strength of the percussion drill, and sends an instruction to the percussion drill and the air compressor when the percussion drill meets a hard object to cause the drilling strength of the percussion drill to be greater than the set drilling strength, so that the percussion drill stops working and upwards drives the percussion drill to return to the initial position when the percussion drill does not move downwards, and the automatic operation of the drilling machine is realized, and the drilling depth can be accurately controlled.
2. The mobile automatic drilling machine for bar planting drilling according to claim 1, characterized in that: the impact drill is an existing impact drill.
3. The mobile automatic drilling machine for bar planting drilling according to claim 1, characterized in that: the movable wheels comprise steering wheels positioned at the front part of the machine body and positioning wheels positioned at the rear part of the machine body.
4. The mobile automatic drilling machine for bar planting drilling according to any one of claims 1 to 3, characterized in that: the drilling machine still includes dust suction means, dust suction means include dust catcher and dust bag, dust catcher and dust bag all be located the fuselage, the dust catcher has the switch and externally arranges the dust absorption pipe of fuselage in, the dust catcher absorbs the produced dust of percussion drill drilling through the dust absorption pipe, the dust storage of will absorbing is in the dust bag.
5. The construction method for drilling by using the mobile automatic drilling machine for bar planting drilling according to claim 4, characterized by comprising the following steps:
firstly, drilling and lofting on a bridge deck or ground;
secondly, aligning a percussion drill rod of the drilling machine to the lofting point for drilling;
and thirdly, performing dust collection and removal operation.
6. The construction method according to claim 5, wherein: the specific treatment process of the first step is as follows: and (4) drilling and lofting the bridge deck or the ground according to a design drawing.
7. The construction method according to claim 5, wherein: the specific treatment process of the second step is as follows: and selecting a proper drill rod according to the drilling depth requirement, and performing drilling operation after adjusting the stroke controller.
8. The construction method according to claim 5, wherein: the concrete treatment process of the third step is as follows: the drilling machine is moved away after drilling, the dust suction pipe is inserted into the hole to suck dust, and then the dust suction pipe is used for cleaning dust around the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810457524.1A CN108625777B (en) | 2018-05-14 | 2018-05-14 | Movable automatic drilling machine for bar planting drilling and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810457524.1A CN108625777B (en) | 2018-05-14 | 2018-05-14 | Movable automatic drilling machine for bar planting drilling and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108625777A CN108625777A (en) | 2018-10-09 |
| CN108625777B true CN108625777B (en) | 2021-08-20 |
Family
ID=63693097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810457524.1A Active CN108625777B (en) | 2018-05-14 | 2018-05-14 | Movable automatic drilling machine for bar planting drilling and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108625777B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520067B (en) * | 2020-04-26 | 2022-03-22 | 山东省高速路桥养护有限公司 | Drilling equipment for drilling holes in planted bars |
| CN114559560A (en) * | 2020-11-27 | 2022-05-31 | 广东博智林机器人有限公司 | Punching operation control method and device and cooperative robot |
| CN114961602B (en) * | 2022-07-06 | 2023-05-12 | 江苏长路智造科技有限公司 | Automatic road drilling and cleaning equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486049A (en) * | 2010-12-06 | 2012-06-06 | 上海伙隆实业有限公司 | Filler wall masonry tie bar planting method |
| CN102794478A (en) * | 2012-08-29 | 2012-11-28 | 孙志强 | Sucking disc type bench drill |
| CN103015469A (en) * | 2012-11-20 | 2013-04-03 | 中国石油天然气集团公司 | Bar planting technique |
| CN105499636A (en) * | 2016-01-06 | 2016-04-20 | 上海大学 | Multihead adjustable high-efficiency drilling operation equipment |
-
2018
- 2018-05-14 CN CN201810457524.1A patent/CN108625777B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486049A (en) * | 2010-12-06 | 2012-06-06 | 上海伙隆实业有限公司 | Filler wall masonry tie bar planting method |
| CN102794478A (en) * | 2012-08-29 | 2012-11-28 | 孙志强 | Sucking disc type bench drill |
| CN103015469A (en) * | 2012-11-20 | 2013-04-03 | 中国石油天然气集团公司 | Bar planting technique |
| CN105499636A (en) * | 2016-01-06 | 2016-04-20 | 上海大学 | Multihead adjustable high-efficiency drilling operation equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108625777A (en) | 2018-10-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108625777B (en) | Movable automatic drilling machine for bar planting drilling and construction method thereof | |
| CN210969442U (en) | Novel wall body puncher | |
| CN108544580A (en) | Drilling device for plank | |
| CN205343331U (en) | Perch automatic drilling machine | |
| CN204024528U (en) | Oil field welldrilling racker | |
| CN208277067U (en) | Drilling device for plank | |
| CN103418817A (en) | Scrap collecting device | |
| CN106583791A (en) | Perforating device for refrigerator van | |
| CN204248009U (en) | Vertical pair of head for boring bar Boring machine | |
| CN205888123U (en) | Tri -axial linkage lathe of working | |
| CN103273543B (en) | Automatic drilling machine for mediant hammer head in piano and drilling method | |
| CN208323273U (en) | The packaged type drilling machine to drill for bridge floor or ground bar planting | |
| CN107433349A (en) | A kind of drilling machine for bus duct | |
| CN202380691U (en) | Punching device | |
| CN207547664U (en) | One kind consolidates fixed board drilling equipment | |
| CN102773512A (en) | Numerically-controlled part drilling equipment | |
| CN109664415A (en) | Ground grooving machine is used in the transformation of measuring and controlling equipment manufacturing enterprise | |
| CN107662249A (en) | A kind of wood producing perforating device | |
| CN215369697U (en) | Multifunctional blast hole cutting drilling tool | |
| CN110419297B (en) | Portable multi-functional gardens ground auger | |
| CN204510863U (en) | Portable electric cuts wall telephone | |
| CN204122786U (en) | Automatic drilling device of turning | |
| CN207592832U (en) | A kind of plank tapping mechanism easy to clean | |
| CN102069210A (en) | Horizontal drilling device | |
| CN106737392B (en) | A kind of needle plate strikes needle device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 510400 4-6 / F, 1161 Panyu Avenue North, Donghuan street, Panyu District, Guangzhou City, Guangdong Province Patentee after: Guangdong Heli Transportation Maintenance Technology Co.,Ltd. Country or region after: China Address before: 510400 4-6 / F, 1161 Panyu Avenue North, Donghuan street, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGDONG HELI CIVIL ENGINEERING Ltd. Country or region before: China |