CN115285869A - Coal mining device using hydraulic winch and using method thereof - Google Patents

Coal mining device using hydraulic winch and using method thereof Download PDF

Info

Publication number
CN115285869A
CN115285869A CN202210920515.8A CN202210920515A CN115285869A CN 115285869 A CN115285869 A CN 115285869A CN 202210920515 A CN202210920515 A CN 202210920515A CN 115285869 A CN115285869 A CN 115285869A
Authority
CN
China
Prior art keywords
hydraulic
winch
coal mining
support
metal net
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
Application number
CN202210920515.8A
Other languages
Chinese (zh)
Other versions
CN115285869B (en
Inventor
刘洋
罗松松
陶永芹
杨凯
董建华
郑礼成
黄超
李绪超
马开放
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Triumph Heavy Industry Co Ltd
Original Assignee
Triumph Heavy Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Triumph Heavy Industry Co Ltd filed Critical Triumph Heavy Industry Co Ltd
Priority to CN202210920515.8A priority Critical patent/CN115285869B/en
Publication of CN115285869A publication Critical patent/CN115285869A/en
Application granted granted Critical
Publication of CN115285869B publication Critical patent/CN115285869B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02Driving gear
    • B66D1/08Driving gear incorporating fluid motors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02Driving gear
    • B66D1/14Power transmissions between power sources and drums or barrels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28Other constructional details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28Other constructional details
    • B66D1/40Control devices
    • B66D1/42Control devices non-automatic
    • B66D1/44Control devices non-automatic pneumatic of hydraulic
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

The invention relates to the technical field of hydraulic winches, in particular to a coal mining device using a hydraulic winch and a using method thereof.

Description

Coal mining device using hydraulic winch and using method thereof
Technical Field
The invention relates to the technical field of hydraulic winches, in particular to a coal mining device using a hydraulic winch and a using method thereof.
Background
In the coal mining face with severe geological conditions: if the coal seam generally has a fracture layer, the coal mining surface with larger inclination angles of the coal seam and the coal rock layer; the coal is a outburst coal layer and is positioned on a coal mining surface of a outburst danger area; the top plate is a composite top plate consisting of sandy mudstone and coal, and has a coal mining surface with the phenomena of top plate breakage and loosening; after a goaf is formed in coal mining operation, a hydraulic support and a metal net are needed to support a goaf area, the main method is that a supporting guard plate on the upper portion of the hydraulic support is lifted to support a top plate of the goaf, a layer of metal net is laid between the supporting guard plate and the top plate, supporting materials such as I-shaped steel and the like are filled under the metal net, the supporting guard plate is used for preventing large rockfall from being hit, the metal net is used for preventing small rockfall in gaps among the hydraulic supports from being hit, and the filled supporting materials are used for reinforcing the rigidity of the metal net and preventing the metal net from being broken.
In the supporting operation, the metal net needs to be rolled into a roll, the metal net is retracted during coal mining operation and is released during supporting operation, the work of retracting and releasing the metal net roll needs to be carried out by manually shaking a mechanical winch handle by workers to drive a steel wire rope on a winch, the metal net is heavy, the manual net retracting of the workers is very labor-consuming, the labor intensity is high, meanwhile, a coal mining roadway needs to be supported by massive metal nets, a large number of mechanical winches need to be arranged, each winch needs to be manually operated, the labor cost is high, and the working efficiency of the coal mining face supporting operation is severely limited.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art background, it is an object of the present invention to provide a coal mining apparatus using a hydraulic winch and a method of using the same.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an use hydraulic capstan's coal mining device, coal mining device includes hydraulic capstan and mounting bracket, hydraulic capstan includes hydraulic motor, and hydraulic motor's surface is provided with the valve unit, and one side of valve unit is provided with the overflow valve, and one side of overflow valve is provided with the manifold block, and one side of manifold block is provided with the magenetic exchange valve.
Furthermore, a transmission gear is arranged inside the hydraulic winch, a base is arranged on one side of the transmission gear, a winch is arranged on the surface of the base, a main shaft which is connected in a rotating mode is arranged on the surface of one side of the winch, a winding drum is arranged at one end of the main shaft, a steel wire rope is arranged on the outer vertical face of the winding drum, and a ratchet and pawl assembly is arranged at one end, far away from the winding drum, of the main shaft.
Furthermore, the mounting rack comprises a support frame arranged on one side of the hydraulic winch, a hydraulic support rotatably connected with one side of the support frame is arranged on one side of the support frame, a pulley is arranged on the surface of one side of the hydraulic support, a metal net coil is arranged on one side of the pulley, a support guard plate is arranged at one end of the hydraulic support,
furthermore, a supporting plate material is arranged on the surface of the supporting plate, a goaf is arranged on one side of the supporting plate, and a coal mining machine is arranged on one side of the mounting frame.
A method of using a coal mining device using a hydraulic winch, comprising the steps of:
the method comprises the following steps: the hydraulic winch is installed on the installation plate of the hydraulic support through the base and the connecting bolt, and the control valve group is connected with the standby hydraulic interface of the hydraulic support through the high-pressure hose.
Step two: when coal mining operation is carried out, the top supporting plate of the hydraulic support is retracted, and one end of a steel wire rope in the hydraulic winch penetrates through a pulley on the hydraulic support to be fixed on a metal net coil.
Step three: the staff operates the electromagnetic directional valve, and the hydraulic winch retracts the steel wire rope to enable the metal net coil to be suspended above the coal mining machine, so that the work of coal mining machine equipment is not interfered.
Step four: and after the coal mining operation is completed to form a goaf, the coal mining machine is moved out, and the top plate of the hydraulic support is unfolded to perform supporting operation.
Step five: and the hydraulic winch releases the steel wire rope, the metal net coil is put down, a worker draws out the metal net from the metal net coil, and the metal net and the filled supporting material are supported on the top of the roadway by the supporting plate on the top of the hydraulic support to perform supporting operation.
Step six: and the hydraulic winch releases the steel wire rope, the metal net coil is put down, a worker draws out the metal net from the metal net coil, and the metal net and the filled supporting material are supported on the top of the roadway by the supporting plate on the top of the hydraulic support to perform supporting operation.
The invention has the beneficial effects that:
1. the control valve group is arranged on the mounting plate of the hydraulic support through the base by using the connecting bolt, and the control valve group is connected with the standby hydraulic interface of the hydraulic support through the high-pressure hose, so that the operation is performed.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view schematic diagram of the control valve assembly;
FIG. 3 is a schematic top plan view of the winch;
FIG. 4 is a schematic structural view of the capstan spindle;
FIG. 5 is a schematic structural view of a hydraulic winch coal mining operation;
fig. 6 is a schematic diagram of a hydraulic winch support operation structure.
The reference numbers in the figures illustrate:
1. a hydraulic winch; 2. a mounting frame; 11. a hydraulic motor; 12. a control valve group; 13. a transmission gear; 14. a base; 15. a winch; 121. an overflow valve; 122. an electromagnetic directional valve; 123. integrating the blocks; 151. a main shaft; 152. a reel; 153. a wire rope; 154. a ratchet and pawl assembly; 21. a support frame; 22. a hydraulic support; 23. a pulley; 24. a metal mesh roll; 25. supporting the guard plate; 251. a support plate material; 26. a gob; 27. a coal mining machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
A coal mining device using a hydraulic winch is shown in figure 1 and comprises a hydraulic winch 1 and a mounting frame 2, as shown in figures 1 and 2, the hydraulic winch 1 comprises a hydraulic motor 11, a control valve group 12 is arranged on the surface of the hydraulic motor 11, an overflow valve 121 is arranged on one side of the control valve group 12, a manifold block 123 is arranged on one side of the overflow valve 121, and an electromagnetic reversing valve 122 is arranged on one side of the manifold block 123.
As shown in FIGS. 1,3 and 4, a transmission gear 13 is arranged inside a hydraulic winch 1, a base 14 is arranged on one side of the transmission gear 13, a winch 15 is arranged on the surface of the base 14, a main shaft 151 is rotatably connected to the surface of one side of the winch 15, a winding drum 152 is arranged at one end of the main shaft 151, a steel wire rope 153 is arranged on the outer vertical surface of the winding drum 152, and a ratchet and pawl assembly 154 is arranged at one end, far away from the winding drum 152, of the main shaft 151.
As shown in fig. 5, the mounting frame 2 comprises a support frame 21 arranged at one side of the hydraulic winch 1, a hydraulic support 22 rotatably connected with one side of the support frame 21, a pulley 23 arranged at the surface of one side of the hydraulic support 22, a metal mesh coil 24 arranged at one side of the pulley 23, a support guard plate 25 arranged at one end of the hydraulic support 22,
as shown in fig. 6, the metal mesh roll 24 is in an unfolded state, a support plate material 251 is provided on the surface of the support plate 25, the gob 26 is provided on one side of the support plate 25, and the shearer 27 is provided on one side of the mounting frame 2.
A method of using a coal mining device using a hydraulic winch, comprising the steps of:
the method comprises the following steps: the hydraulic winch 1 is installed on a mounting plate of a hydraulic support 22 through a base 14 by using a connecting bolt, and the control valve group 12 is connected with a standby hydraulic interface of the hydraulic support through a high-pressure hose.
Step two: when the coal mining operation is carried out, the top support guard plate 25 of the hydraulic support 22 is retracted, and one end of the wire rope 153 in the hydraulic winch 1 is fixed to the metal mesh roll 24 through the pulley 23 on the hydraulic support 22.
Step three: the worker operates the electromagnetic directional valve 122, and the hydraulic winch 1 retracts the wire rope 153 to suspend the metal mesh coil 24 above the coal mining machine 27 without interfering with the operation of the equipment of the coal mining machine 27.
Step four: after the goaf 26 is formed after the coal mining operation is completed, the coal mining machine 27 is moved out, and the top plate of the hydraulic support 22 is unfolded for supporting operation.
Step five: the hydraulic winch 1 releases the wire rope 153, the wire mesh roll 24 is lowered, and the worker pulls out the wire mesh from the wire mesh roll 24, and the wire mesh is supported on the top of the roadway by the top support plate 25 of the hydraulic bracket 22 together with the filled support material 251 to perform the supporting operation.
Step six: the hydraulic winch 1 releases the wire rope 153, the wire mesh roll 24 is lowered, and the worker pulls out the wire mesh from the wire mesh roll 24, and the wire mesh is supported on the top of the roadway by the top support plate 25 of the hydraulic bracket 22 together with the filled support material 251 to perform the supporting operation.
The working principle is as follows:
the hydraulic winch 1 is installed on a mounting plate of a hydraulic support 22 through a base 14 by using a connecting bolt, and the control valve group 12 is connected with a standby hydraulic interface of the hydraulic support through a high-pressure hose.
When the coal mining operation is carried out, the top support guard plate 25 of the hydraulic support 22 is retracted, one end of a steel wire rope 153 in the hydraulic winch 1 penetrates through the pulley 23 on the hydraulic support 22 to be fixed on the metal mesh roll 24, a worker operates the electromagnetic reversing valve 122, and the hydraulic winch 1 retracts the steel wire rope 153 to enable the metal mesh roll 24 to be suspended above the coal mining machine 27 without interfering with the operation of equipment of the coal mining machine 27.
After the coal mining operation is completed to form the gob 26, the coal mining machine 27 is moved out, the top plate of the hydraulic support 22 is unfolded to perform supporting operation, the hydraulic winch 1 discharges the steel wire rope 153, the metal mesh coil 24 is put down, a worker draws out the metal mesh from the metal mesh coil 24, the metal mesh and the filled supporting material 251 are jacked on the top of the roadway by the supporting and protecting plate 25 on the top of the hydraulic support 22 to perform supporting operation, after the supporting operation is completed, the supporting and protecting plate 25 on the top of the hydraulic support 22 is retracted, the hydraulic winch 1 retracts the steel wire rope 153, the metal mesh coil 24 is retracted to the original position, and the coal mining machine 27 enters the next round of coal mining operation.
Has the advantages that:
the control valve group 12 is installed on the installation plate of the hydraulic support 22 through the base 14 by using a connection bolt, and is connected with the spare hydraulic interface of the hydraulic support through the high-pressure hose, so that the operation is performed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims (4)

1. A coal mining device using a hydraulic winch comprises the hydraulic winch 1 and an installation frame 2, and is characterized in that the hydraulic winch (1) comprises a hydraulic motor (11), a control valve group (12) is arranged on the surface of the hydraulic motor (11), an overflow valve (121) is arranged on one side of the control valve group (12), a manifold block (123) is arranged on one side of the overflow valve (121), and an electromagnetic reversing valve (122) is arranged on one side of the manifold block (123);
the hydraulic winch is characterized in that a transmission gear (13) is arranged inside the hydraulic winch (1), a base (14) is arranged on one side of the transmission gear (13), a winch (15) is arranged on the surface of the base (14), a main shaft (151) which is connected in a rotating mode is arranged on the surface of one side of the winch (15), a winding drum (152) is arranged at one end of the main shaft (151), a steel wire rope (153) is arranged on the outer vertical surface of the winding drum (152), and a ratchet and pawl assembly (154) is arranged at one end, far away from the winding drum (152), of the main shaft (151).
2. A coal mining device using a hydraulic winch according to claim 1, characterized in that the mounting frame (2) comprises a support frame (21) arranged on one side of the hydraulic winch (1), one side of the support frame (21) is provided with a hydraulic support (22) which is rotatably connected, the surface of one side of the hydraulic support (22) is provided with a pulley (23), one side of the pulley (23) is provided with a metal net roll (24), and one end of the hydraulic support (22) is provided with a support and protection plate (25).
3. A mining apparatus using a hydraulic winch according to claim 2, characterized in that the surface of the supporting plate (25) is provided with a supporting plate material (251), one side of the supporting plate (25) is a goaf (26), and one side of the mounting frame (2) is provided with a coal cutter (27).
4. The use method of the coal mining device using the hydraulic winch is characterized by comprising the following steps of:
the method comprises the following steps: the hydraulic winch (1) is installed on an installation plate of a hydraulic support (22) through a base (14) by using a connecting bolt, and the control valve group (12) is connected with a standby hydraulic interface of the hydraulic support through a high-pressure hose;
step two: when coal mining operation is carried out, the top supporting and protecting plate (25) of the hydraulic support (22) is retracted, and one end of a steel wire rope (153) in the hydraulic winch (1) passes through a pulley (23) on the hydraulic support (22) and is fixed on a metal mesh coil (24);
step three: the worker operates the electromagnetic directional valve (122), the hydraulic winch (1) retracts the steel wire rope (153) to enable the metal net roll (24) to be suspended above the coal mining machine (27), and the work of equipment of the coal mining machine (27) is not interfered;
step four: after a goaf (26) is formed after the coal mining operation is finished, the coal mining machine (27) is moved out, and a top plate of the hydraulic support (22) is unfolded to perform supporting operation;
step five: the hydraulic winch (1) releases the steel wire rope (153), the metal net coil (24) is put down, a worker draws out the metal net from the metal net coil (24), and the metal net and the filled supporting material (251) are jacked on the top of the roadway by the supporting plate (25) on the top of the hydraulic support (22) to perform supporting operation;
step six: the hydraulic winch (1) releases the steel wire rope (153), the metal net coil (24) is put down, a worker draws out the metal net from the metal net coil (24), and the metal net and the filled supporting material (251) are jacked on the top of the roadway by the supporting plate (25) on the top of the hydraulic support (22) to perform supporting operation.
CN202210920515.8A 2022-08-02 2022-08-02 Coal mining device using hydraulic winch and using method thereof Active CN115285869B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210920515.8A CN115285869B (en) 2022-08-02 2022-08-02 Coal mining device using hydraulic winch and using method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210920515.8A CN115285869B (en) 2022-08-02 2022-08-02 Coal mining device using hydraulic winch and using method thereof

Publications (2)

Publication Number Publication Date
CN115285869A true CN115285869A (en) 2022-11-04
CN115285869B CN115285869B (en) 2024-05-03

Family

ID=83826546

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210920515.8A Active CN115285869B (en) 2022-08-02 2022-08-02 Coal mining device using hydraulic winch and using method thereof

Country Status (1)

Country Link
CN (1) CN115285869B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2245052Y (en) * 1995-09-20 1997-01-15 王斌 Operating device driven by electric power
CN101746680A (en) * 2010-02-05 2010-06-23 射阳远洋船舶辅机有限公司 Device for rapidly collecting and releasing boats
CN105156074A (en) * 2015-07-22 2015-12-16 浙江大学 Multi-well trial production equipment adopting hydraulic winch
CN105967080A (en) * 2016-07-21 2016-09-28 常州御发工矿设备有限公司 Transportation winch for coal mine transportation system
CN207175302U (en) * 2017-08-30 2018-04-03 牡丹江专用汽车制造有限公司 Efficient more rotating speed fluid pressure drive devices
CN207390880U (en) * 2017-11-08 2018-05-22 邵莹 A kind of Multifunctional winch
CN213088040U (en) * 2020-09-11 2021-04-30 国家能源集团宁夏煤业有限责任公司 Automatic control device for fully mechanized coal mining face withdrawing and net laying process
CN114776289A (en) * 2022-04-24 2022-07-22 河南理工大学 Distributed coal cutting device for coal mining working face of coal mine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2245052Y (en) * 1995-09-20 1997-01-15 王斌 Operating device driven by electric power
CN101746680A (en) * 2010-02-05 2010-06-23 射阳远洋船舶辅机有限公司 Device for rapidly collecting and releasing boats
CN105156074A (en) * 2015-07-22 2015-12-16 浙江大学 Multi-well trial production equipment adopting hydraulic winch
CN105967080A (en) * 2016-07-21 2016-09-28 常州御发工矿设备有限公司 Transportation winch for coal mine transportation system
CN207175302U (en) * 2017-08-30 2018-04-03 牡丹江专用汽车制造有限公司 Efficient more rotating speed fluid pressure drive devices
CN207390880U (en) * 2017-11-08 2018-05-22 邵莹 A kind of Multifunctional winch
CN213088040U (en) * 2020-09-11 2021-04-30 国家能源集团宁夏煤业有限责任公司 Automatic control device for fully mechanized coal mining face withdrawing and net laying process
CN114776289A (en) * 2022-04-24 2022-07-22 河南理工大学 Distributed coal cutting device for coal mining working face of coal mine

Also Published As

Publication number Publication date
CN115285869B (en) 2024-05-03

Similar Documents

Publication Publication Date Title
CN112938774B (en) Integral hoisting system and hoisting method for assembly type component
CN108678752A (en) Shaft equipment rapid installation process
CN210289811U (en) Crane externally-hung anchor rod drilling machine
CN115285869A (en) Coal mining device using hydraulic winch and using method thereof
CN110469102A (en) A kind of high-altitude combined steel beam installs the operating platform and its construction method
CN113818704A (en) Foundation pit canopy dustproof system and construction method thereof
CN110777787A (en) Method for preventing drilled pile from collapsing by automatically bouncing steel casing
JP2797244B2 (en) Shaft excavation device and shaft construction method
CN110065888A (en) A kind of cable crane main rope Demolition Construction method
CN211171941U (en) Manual hole digging operation frame based on full-sleeve full-slewing drilling machine
CN107130601B (en) Device and method for improving pile head breaking efficiency
CN112727509A (en) Anchor net cable rope supporting method and structure for heavy seam large mining height fully-mechanized mining support withdrawing channel
CN212269190U (en) Brick hanging barrel for building construction
JP2602753B2 (en) Deep foundation excavation method
CN214330663U (en) Coal mine support net for fully mechanized caving face retraction
CN218542243U (en) Novel combine machine of digging with strut function
CN219279332U (en) Movable rotary long-arm crane
CN218620224U (en) Top plate blasting shielding device
CN215331634U (en) Device for protecting hole opening of dug pile during lifting
CN214359966U (en) Dust screen lifting device and building foundation pit dust screen lifting system
CN214885358U (en) A operation platform structure for super high-rise building outer wall construction
CN214499035U (en) Protection device for cutting head of unit
JP7438006B2 (en) How to remove existing piles
JP3303115B2 (en) Underground shaft construction equipment
CN218476933U (en) Concrete slab drilling equipment for building construction

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