CN110410006B - Drilling machine for drilling inclined top plate of special-shaped roadway - Google Patents

Drilling machine for drilling inclined top plate of special-shaped roadway Download PDF

Info

Publication number
CN110410006B
CN110410006B CN201910604347.XA CN201910604347A CN110410006B CN 110410006 B CN110410006 B CN 110410006B CN 201910604347 A CN201910604347 A CN 201910604347A CN 110410006 B CN110410006 B CN 110410006B
Authority
CN
China
Prior art keywords
plate
telescopic cylinder
cylinder
adjusting
drilling 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.)
Expired - Fee Related
Application number
CN201910604347.XA
Other languages
Chinese (zh)
Other versions
CN110410006A (en
Inventor
赵通
弓培林
李超
李鹏
李建忠
王开
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.)
Taiyuan University of Technology
Original Assignee
Taiyuan University of Technology
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 Taiyuan University of Technology filed Critical Taiyuan University of Technology
Priority to CN201910604347.XA priority Critical patent/CN110410006B/en
Publication of CN110410006A publication Critical patent/CN110410006A/en
Application granted granted Critical
Publication of CN110410006B publication Critical patent/CN110410006B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B15/00Supports for the drilling machine, e.g. derricks or masts
    • E21B15/003Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/02Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/02Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/022Control of the drilling operation; Hydraulic or pneumatic means for activation or operation
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/02Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
    • E21B7/024Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

The invention discloses a drilling machine for drilling an inclined top plate of a special-shaped roadway, wherein a main telescopic cylinder is vertically arranged on a bottom plate; an upper mounting plate is fixed at the top of the main telescopic rod; a left telescopic cylinder and a right telescopic cylinder are respectively arranged on two sides of the main telescopic cylinder; the outer side ends of the left telescopic cylinder and the right telescopic cylinder are respectively connected with a sub-pressing plate through a left telescopic rod and a right telescopic rod; the lower regulating wheel and the upper regulating wheel are wound with regulating steel belts; the right side of the upper surface of the upper mounting plate is provided with an adjusting cylinder through a rotating shaft; the telescopic end of the adjusting cylinder is rotatably arranged on the side surface of the track plate; positioning holes are uniformly formed in the middle of the side face of the track plate; a side plate is arranged on the positioning hole through a positioning pin; the side plate is arranged on the side surface of the adjusting slide block; the adjusting slide block is provided with a drilling machine body through a connecting plate; an operation cabinet is arranged on the side wall of the main telescopic cylinder. The drilling machine for drilling the inclined top plate of the special-shaped roadway has the advantages of labor saving, convenience in operation, accuracy in adjustment, stability in work and high efficiency.

Description

Drilling machine for drilling inclined top plate of special-shaped roadway
Technical Field
The invention relates to the technical field of underground coal mine equipment, in particular to a drilling machine for drilling an inclined top plate of a special-shaped roadway.
Background
The side walls of two sides of the special-shaped roadway are perpendicular to the floor rock stratum, and the top inclination angle is generally determined by the coal seam (rock stratum) inclination angle, namely the top plate inclination angle is consistent with the coal seam (rock stratum) inclination angle.
The coal resources in China are rich and are one of the main energy sources, wherein roadway excavation and support are the main work of coal mine well mining, the roadway generally adopts an anchor rod support mode, and the anchor rod support is to anchor an anchor rod into surrounding rocks so that an integral and stable compressed rock zone is formed around the roadway to achieve the aim of jointly working a rod body and the surrounding rocks. In the anchor bolt support, firstly, the top of the roadway and the side walls of the two sides are drilled according to the design, the process is long in time consumption and high in manpower consumption, particularly, when the drilling of the inclined top plate of the unconventional irregular roadway is carried out, the operation is greatly limited due to the spatial relation between the inclined top plate and the two sides, particularly, a drilling machine cannot be arranged at the corner due to narrow space for operation, partial drilling holes are lost, the support design requirements are deviated, and the engineering quality and the safety are influenced. Meanwhile, the traditional drilling machine needs to be erected with a working ladder and manually constructed by hands, and is unstable in operation and high in difficulty, so that drilling machine equipment suitable for the situation needs to be researched and developed to solve the existing practical problems, and meanwhile, the drilling machine has a wide application value in rock tunnel engineering.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the drilling machine for drilling the inclined top plate of the special-shaped roadway, which is labor-saving, convenient to operate, accurate in adjustment, stable in work and high in efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: a drilling machine for drilling an inclined top plate of a special-shaped roadway comprises a bottom plate, a main telescopic cylinder, a main telescopic rod, an upper mounting plate, an arc-shaped clamping plate, a left telescopic cylinder, a right telescopic cylinder, a left telescopic rod, a right telescopic rod, a sub-pressing plate, a support, a lower adjusting wheel, a track plate, an upper adjusting wheel, an adjusting steel belt, a rotating shaft, an adjusting cylinder, a positioning hole, a drilling machine body, a connecting plate, an adjusting slide block, a side plate, a positioning pin, a drilling rod, an operation cabinet, a pipeline and a switch button, wherein the main telescopic cylinder is vertically mounted on; a main telescopic rod is arranged inside the main telescopic cylinder; an upper mounting plate is fixed at the top of the main telescopic rod; a left telescopic cylinder and a right telescopic cylinder are respectively arranged on two sides of the main telescopic cylinder; the end parts of the left telescopic cylinder and the right telescopic cylinder, which are close to one side of the main telescopic cylinder, are provided with arc-shaped clamping plates; the outer side ends of the left telescopic cylinder and the right telescopic cylinder are respectively connected with a sub-pressing plate through a left telescopic rod and a right telescopic rod; a lower adjusting wheel is movably mounted on the left side of the upper surface of the upper mounting plate through a support; the lower adjusting wheel is connected with an upper adjusting wheel through a track plate; the lower adjusting wheel and the upper adjusting wheel are wound with adjusting steel belts; an adjusting cylinder is arranged on the right side of the upper surface of the upper mounting plate through a rotating shaft; the telescopic end of the adjusting cylinder is rotatably arranged on the side surface of the track plate; positioning holes are uniformly formed in the middle of the side face of the track plate; a side plate is arranged on the positioning hole through a positioning pin; the side plate is arranged on the side surface of the adjusting slide block; the adjusting slide block is provided with a drilling machine body through a connecting plate; the drilling machine body is provided with a drill rod; an operation cabinet is arranged on the side wall of the main telescopic cylinder; the main telescopic cylinder, the left telescopic cylinder, the right telescopic cylinder and the adjusting cylinder are all connected with the operation cabinet through pipelines.
As a further improvement of the invention, the lower surface of the bottom plate is provided with a belt brake roller.
As a further improvement of the invention, the front surface of the operation cabinet is provided with a plurality of control switch buttons and a pressure display.
As a further improvement of the invention, the main telescopic cylinder, the left telescopic cylinder, the right telescopic cylinder and the adjusting cylinder are driven by hydraulic pressure or air pressure.
As a further improvement of the invention, an anti-skid rubber pad is fixed on the inner wall of the arc-shaped groove of the arc-shaped clamping plate.
The invention provides a drilling machine for drilling an inclined top plate of a special-shaped roadway, which has the following beneficial effects:
according to the technical scheme, the main telescopic cylinder and the main telescopic rod are arranged, and the support and the adjusting cylinder are respectively arranged at the top end of the main telescopic rod through the upper mounting plate, so that the beneficial technical effects of convenience in adjusting the operation height of the drilling equipment on the upper mounting plate, high adjustment precision and stable operation can be realized; according to the technical scheme, the track plate and the adjusting steel belt are connected and arranged between the upper adjusting wheel and the lower adjusting wheel on the support, the side face of the track plate is connected with the upper mounting plate through the adjusting cylinder, and the adjusting steel belt is connected with the drilling machine body through the adjusting slide block, the side plate and the positioning pin; this technical scheme still installs left telescoping cylinder, right telescoping cylinder, left telescopic link and right telescopic link in the both sides of main telescoping cylinder through the arc cardboard, and the outside end of left telescopic link and right telescopic link all installs branch clamp plate, just so can stretch out and draw back until withstanding the tunnel wall according to the actual position condition through controlling the telescopic link, realize the rigidity to main telescoping cylinder and upper portion equipment, have the position fixed easy and simple to handle, accommodation is wide and creep into the firm beneficial technological effect of job stabilization.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a partially enlarged schematic view of the connection relationship of the drilling machine body of the present invention.
Fig. 3 is a partially enlarged schematic view of the joint of the left telescopic cylinder or the right telescopic cylinder of the present invention.
The reference numbers in the figures are: 1. a base plate; 2. a main telescopic cylinder; 3. a main telescopic rod; 4. an upper mounting plate; 5. an arc-shaped clamping plate; 6. a left telescoping cylinder; 7. a right telescoping cylinder; 8. a left telescoping rod; 9. a right telescopic rod; 10. a pressure distributing plate; 11. a support; 12. a lower adjustment wheel; 13. a track plate; 14. an upper regulating wheel; 15. adjusting the steel belt; 16. a rotating shaft; 17. an adjusting cylinder; 18. positioning holes; 19. a drill body; 20. a connecting plate; 21. adjusting the sliding block; 22. a side plate; 23. positioning pins; 24. a drill stem; 25. an operation cabinet; 26. a pipeline; 27. a switch button; 28. a pressure display; 29. a belt brake roller; 51. anti-skid rubber pad.
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.
Referring to fig. 1-3, an embodiment of the present invention is shown; a drilling machine for drilling an inclined top plate of a special-shaped roadway comprises a bottom plate 1, a main telescopic cylinder 2, a main telescopic rod 3, an upper mounting plate 4, an arc-shaped clamping plate 5, a left telescopic cylinder 6, a right telescopic cylinder 7, a left telescopic rod 8, a right telescopic rod 9, a pressure dividing plate 10, a support 11, a lower adjusting wheel 12, a track plate 13, an upper adjusting wheel 14, an adjusting steel belt 15, a rotating shaft 16, an adjusting cylinder 17, a positioning hole 18, a drilling machine body 19, a connecting plate 20, an adjusting slide block 21, a side plate 22, a positioning pin 23, a drilling rod 24, an operation cabinet 25, a pipeline 26 and a switch button 27, wherein the main telescopic cylinder 2 is vertically arranged on the bottom; a main telescopic rod 3 is arranged inside the main telescopic cylinder 2; an upper mounting plate 4 is fixed at the top of the main telescopic rod 3; a left telescopic cylinder 6 and a right telescopic cylinder 7 are respectively arranged on two sides of the main telescopic cylinder 2; the end parts of the left telescopic cylinder 6 and the right telescopic cylinder 7, which are close to one side of the main telescopic cylinder 2, are provided with arc-shaped clamping plates 5; the outer side ends of the left telescopic cylinder 6 and the right telescopic cylinder 7 are respectively connected with a sub-pressing plate 10 through a left telescopic rod 8 and a right telescopic rod 9.
A lower adjusting wheel 12 is movably arranged on the left side of the upper surface of the upper mounting plate 4 through a support 11; the lower adjusting wheel 12 is connected with an upper adjusting wheel 14 through a track plate 13; the lower adjusting wheel 12 and the upper adjusting wheel 14 are wound with an adjusting steel belt 15; an adjusting cylinder 17 is arranged on the right side of the upper surface of the upper mounting plate 4 through a rotating shaft 16; the telescopic end of the adjusting cylinder 17 is rotatably arranged on the side surface of the track plate 13; positioning holes 18 are uniformly formed in the middle of the side face of the track plate 13; a side plate 22 is arranged on the positioning hole 18 through a positioning pin 23; the side plate 22 is arranged on the side surface of the adjusting slide block 21; the adjusting slide block 21 is provided with a drilling machine body 19 through a connecting plate 20; the drill body 19 is provided with a drill rod 24; an operation cabinet 25 is arranged on the side wall of the main telescopic cylinder 2; the main telescopic cylinder 2, the left telescopic cylinder 6, the right telescopic cylinder 7 and the adjusting cylinder 17 are all connected with an operation cabinet 25 through pipelines 26.
The lower surface of the bottom plate 1 is provided with a belt brake roller 29. The front surface of the operation cabinet 25 is provided with a plurality of control switch buttons 27 and a pressure display 28. The main telescopic cylinder 2, the left telescopic cylinder 6, the right telescopic cylinder 7 and the adjusting cylinder 17 are driven by hydraulic pressure or air pressure. And an anti-skid rubber pad 51 is fixed on the inner wall of the arc-shaped groove of the arc-shaped clamping plate 5.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a be used for special-shaped tunnel slope roof drilling rig which characterized in that: the drilling machine comprises a base plate (1), a main telescopic cylinder (2), a main telescopic rod (3), an upper mounting plate (4), an arc-shaped clamping plate (5), a left telescopic cylinder (6), a right telescopic cylinder (7), a left telescopic rod (8), a right telescopic rod (9), a pressure dividing plate (10), a support (11), a lower adjusting wheel (12), a track plate (13), an upper adjusting wheel (14), an adjusting steel belt (15), a rotating shaft (16), an adjusting cylinder (17), a positioning hole (18), a drilling machine body (19), a connecting plate (20), an adjusting slider (21), a side plate (22), a positioning pin (23), a drilling rod (24), an operation cabinet (25), a pipeline (26) and a switch button (27), wherein the main telescopic cylinder (2) is vertically mounted on the base plate (1); a main telescopic rod (3) is arranged in the main telescopic cylinder (2); an upper mounting plate (4) is fixed at the top of the main telescopic rod (3); a left telescopic cylinder (6) and a right telescopic cylinder (7) are respectively arranged on two sides of the main telescopic cylinder (2); the end parts of the left telescopic cylinder (6) and the right telescopic cylinder (7) close to one side of the main telescopic cylinder (2) are both provided with arc-shaped clamping plates (5); the outer side ends of the left telescopic cylinder (6) and the right telescopic cylinder (7) are respectively connected with a pressure distributing plate (10) through a left telescopic rod (8) and a right telescopic rod (9); a lower adjusting wheel (12) is movably arranged on the left side of the upper surface of the upper mounting plate (4) through a support (11); the lower adjusting wheel (12) is connected with an upper adjusting wheel (14) through a track plate (13); the lower adjusting wheel (12) and the upper adjusting wheel (14) are wound with adjusting steel belts (15); an adjusting cylinder (17) is arranged on the right side of the upper surface of the upper mounting plate (4) through a rotating shaft (16); the telescopic end of the adjusting cylinder (17) is rotatably arranged on the side surface of the track plate (13); positioning holes (18) are uniformly formed in the middle of the side face of the track plate (13); a side plate (22) is arranged on the positioning hole (18) through a positioning pin (23); the side plate (22) is arranged on the side surface of the adjusting slide block (21); the adjusting slide block (21) is provided with a drilling machine body (19) through a connecting plate (20); the drilling machine body (19) is provided with a drill rod (24); an operation cabinet (25) is arranged on the side wall of the main telescopic cylinder (2); the main telescopic cylinder (2), the left telescopic cylinder (6), the right telescopic cylinder (7) and the adjusting cylinder (17) are all connected with an operation cabinet (25) through pipelines (26).
2. The drilling machine for the special-shaped roadway inclined roof plate according to claim 1, wherein: the lower surface of the bottom plate (1) is provided with a braking roller (29).
3. The drilling machine for the special-shaped roadway inclined roof plate according to claim 1, wherein: the front surface of the operation cabinet (25) is provided with a plurality of control switch buttons (27) and a pressure display (28).
4. The drilling machine for the special-shaped roadway inclined roof plate according to claim 1, wherein: the main telescopic cylinder (2), the left telescopic cylinder (6), the right telescopic cylinder (7) and the adjusting cylinder (17) are driven by hydraulic pressure or air pressure.
5. The drilling machine for the special-shaped roadway inclined roof plate according to claim 1, wherein: and an anti-skidding rubber pad (51) is further fixed on the inner wall of the arc-shaped groove of the arc-shaped clamping plate (5).
CN201910604347.XA 2019-07-05 2019-07-05 Drilling machine for drilling inclined top plate of special-shaped roadway Expired - Fee Related CN110410006B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910604347.XA CN110410006B (en) 2019-07-05 2019-07-05 Drilling machine for drilling inclined top plate of special-shaped roadway

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910604347.XA CN110410006B (en) 2019-07-05 2019-07-05 Drilling machine for drilling inclined top plate of special-shaped roadway

Publications (2)

Publication Number Publication Date
CN110410006A CN110410006A (en) 2019-11-05
CN110410006B true CN110410006B (en) 2020-08-21

Family

ID=68360448

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910604347.XA Expired - Fee Related CN110410006B (en) 2019-07-05 2019-07-05 Drilling machine for drilling inclined top plate of special-shaped roadway

Country Status (1)

Country Link
CN (1) CN110410006B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114251050A (en) * 2021-05-21 2022-03-29 徐州景安重工机械制造有限公司 Gas lift reverse circulation drilling device
CN114016925B (en) * 2021-11-15 2024-03-22 中铁三局集团第五工程有限公司 Accurate perforating device for tunnel blasting hole and construction method

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5954143A (en) * 1998-02-21 1999-09-21 Mccabe; Howard Wendell Remote controlled all-terrain drill unit
RU2351733C1 (en) * 2007-08-28 2009-04-10 Открытое акционерное общество "Красноярская горно-геологическая компания" Drilling rig
CN201513118U (en) * 2009-10-14 2010-06-23 青岛达邦钻机有限责任公司 Portable support engineering drill rig
CN102031930B (en) * 2010-12-25 2012-05-23 平顶山市铁福来机电设备有限公司 Multidirectional hydraulic drill rig with floating rotary device
CN203559773U (en) * 2013-11-05 2014-04-23 石家庄煤矿机械有限责任公司 Blasting mining drill wagon for thin seam
CN203978274U (en) * 2014-07-24 2014-12-03 孙宇勇 A kind of Intelligent dust-proof lifting auger
CN204419030U (en) * 2014-12-20 2015-06-24 石家庄奥创矿用设备有限公司 A kind of novel pneumatic post drill
CN205689133U (en) * 2016-06-29 2016-11-16 新汶矿业集团有限责任公司翟镇煤矿 Tunnelling jumbolter
CN205823159U (en) * 2016-07-29 2016-12-21 张传玖 Advance borehole device under the conditions of the tight roof of a kind of colliery
CN206722754U (en) * 2017-04-21 2017-12-08 平安煤炭开采工程技术研究院有限责任公司 Roofbolt rig
CN206972159U (en) * 2017-06-14 2018-02-06 宋作文 A kind of coal mine down-hole tunnel anchor rod drilling device
CN207960495U (en) * 2017-12-27 2018-10-12 山东科技大学 A kind of medium-thickness seam high punch automatic lifting drilling machine
CN108612478A (en) * 2018-05-14 2018-10-02 陈玉玲 A kind of drive drilling equipment facilitating adjusting position and angle

Also Published As

Publication number Publication date
CN110410006A (en) 2019-11-05

Similar Documents

Publication Publication Date Title
CN110410006B (en) Drilling machine for drilling inclined top plate of special-shaped roadway
CN106988679A (en) A kind of rock gangway crawler type trench digging traverse drill rises all-in-one
WO2020052012A1 (en) Construction method for continuous mining machine having device continuously providing provisional roof support
CN102134968A (en) Drilling system and drilling equipment
CN102704927A (en) Comprehensive mechanization stone drift heading machine set
CN203769787U (en) Mining whole-section rectangular heading machine supporting, propelling and direction adjusting mechanism
CN103758464A (en) Mining drill support
CN206554795U (en) A kind of convertible multi-angle coal mine drilling machine of crawler travel
CN205689133U (en) Tunnelling jumbolter
CN104499949B (en) A kind of removable drill boom for coal mine support
CN104747070B (en) A kind of many drill bits switchgear bored on formula coal-winning machine and method
CN203362166U (en) Supporting work platform for heading roadway
CN110878673A (en) Angle-adjustable automatic drilling machine
CN204253085U (en) There is the Telescopic beam of hydraulic bracket auxiliary shoring device of locking function
CN201581798U (en) Upward type rock drilling machine
CN201650113U (en) Pneumatic anchor drill
CN204402523U (en) The brill anchor device of large width simultaneous drifting coal road comprehensive dig-anchor machine
CN211144485U (en) Onboard anchoring and protecting device of development machine
CN219622632U (en) Rock drill guiding trolley
CN108547652A (en) A kind of telescopic arc crown frame of separation
CN108533300A (en) A kind of Telescopic movable supporting arch
CN215761667U (en) Horizontal rock drilling and splitting integrated equipment
CN215486095U (en) Ultra-thin roof roadway roof supporting component under goaf
CN218713414U (en) A ditch excavating gear for tunnelling working face bottom plate in pit
CN101761309B (en) Stoper

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
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200821

Termination date: 20210705

CF01 Termination of patent right due to non-payment of annual fee