CN111608655A - Hydraulic drive thin coal seam coal mining machine - Google Patents
Hydraulic drive thin coal seam coal mining machine Download PDFInfo
- Publication number
- CN111608655A CN111608655A CN202010443725.3A CN202010443725A CN111608655A CN 111608655 A CN111608655 A CN 111608655A CN 202010443725 A CN202010443725 A CN 202010443725A CN 111608655 A CN111608655 A CN 111608655A
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- Prior art keywords
- mining machine
- coal mining
- hydraulic motor
- roller
- coal
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
- E21C25/16—Machines slitting solely by one or more rotating saws, cutting discs, or wheels
- E21C25/18—Saws; Discs; Wheels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C31/00—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
- E21C31/02—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam for cutting or breaking-down devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Abstract
The invention discloses a hydraulic drive thin coal seam coal mining machine, which comprises a cutting part, a coal mining machine rocker arm and an external traction walking part, wherein the cutting part is arranged on the upper part of the coal mining machine; the cutting part comprises a coal mining drum and a hydraulic motor; the hydraulic motor provides power for the coal mining roller; the hydraulic motor is connected with an external variable pump station through a hydraulic oil pipe, and a supercharging device is arranged on the hydraulic oil pipe; the cutting part is rigidly connected with a rocker arm of the coal mining machine. The large-torque hydraulic motor is externally connected with a variable pump station to drive the cutting part of the coal mining machine, and the large-torque hydraulic motor has the advantages of simple structure, reasonable design, no gear amplitude transmission, high reliability, high starting rate, low failure rate and convenience in maintenance and overhaul. The hydraulic drive coal mining machine roller, the diameter of the cutting roller can be miniaturized, and the hydraulic drive coal mining machine roller is suitable for mining the geological condition of the extremely thin coal seam with the mining height ranging from 0.6m to 1.3 m. The hydraulic motor is adopted, cutting at variable speed can be realized, the cutting speed can be automatically reduced and the torque can be increased when the cutting resistance is increased, and stepless speed regulation is realized.
Description
Technical Field
The invention relates to the technical field of mineral mining, in particular to a hydraulic drive thin coal seam coal mining machine.
Background
China has abundant coal resources and diversified storage forms, particularly, thin coal seams have more resources, wide distribution and large occupied proportion, which accounts for about 20 percent of national coal, and the total storage capacity reaches 60 hundred million tons. However, thin coal seams mostly have faults and folds, have large fluctuation, are provided with more gangue and other complex geological structures, are mostly coal seams with the thickness of less than 1.3m, and face the problems of narrow mining space, bad working conditions, low coal resource recovery rate and the like. The coal mining machine is used as core equipment of a fully mechanized coal mining face, is limited by mining space, is difficult to install, operate and maintain, and has high labor intensity. Therefore, the thin seam coal mining machine has the characteristics of high machine body strength, simple structure, good reliability, strong adaptability, excellent performance and the like. At present, the existing thin coal seam coal mining machine mainly has the following problems: the rotary speed of the roller of the cutting part is constant, the mining efficiency is poor, and the lump coal rate is low. Mechanical and electrical breakdown and shutdown are frequently caused, and the starting rate is low. The main components of the coal mining machine such as the cutting part, the traction part and the electric cabinet have complex structures, high failure rate and high maintenance difficulty. Aiming at the problems of low mining efficiency and resource waste of a complex working surface of a thin coal seam, a thin coal seam coal mining machine which is simple in structure, convenient to operate, high in reliability and strong in adaptability is urgently needed to be developed.
Disclosure of Invention
Therefore, the invention aims to provide a hydraulic drive thin coal seam mining machine, which is characterized in that: comprises a cutting part, a rocker arm of a coal mining machine and an external traction walking part; the cutting part comprises a coal mining drum and a hydraulic motor; the hydraulic motor provides power for the coal mining roller; the hydraulic motor is connected with an external variable pump station through a hydraulic oil pipe, and a supercharging device is arranged on the hydraulic oil pipe; the cutting part is rigidly connected with a rocker arm of the coal mining machine.
The hydraulic motor is connected with the coal mining roller through an output shaft.
The hydraulic motor is connected with the coal mining roller through a hydraulic motor shell.
The hydraulic motor is a low-rotating-speed high-torque hydraulic motor, the diameter of the hydraulic motor is 450mm-1350mm, the torque of the hydraulic motor is 7000 nm-100 ten thousand nm, and the rotating speed of the hydraulic motor is 10r/min-100 r/min.
The hydraulic oil pipe is connected to the variable pump.
An overflow valve and a safety valve are arranged on the hydraulic oil pipe; and a filter is arranged at the joint of the hydraulic oil pipe and the external pump station.
The outer traction walking part is provided with an automatic oil dragging pipe device, the automatic oil dragging pipe device comprises an oil pipe movable connector and a clamping plate, and the hydraulic oil pipe is installed in the clamping plate.
And the outer traction walking part is provided with a walking wheel or a traction chain, and the walking wheel can be meshed with a traction pin rail on the scraper conveyor or realize chain traction.
The coal mining roller comprises a hydraulic motor roller body, and a roller excavating shell; a cutting pick is arranged on the drum excavating shell; the roller excavating shell is provided with a positioning pin, and the roller body is provided with a positioning groove; when the roller excavating shell is arranged on the roller body, the positioning pin is inserted into the positioning groove; the drum excavating shell is provided with a through hole, and the drum body is provided with a threaded mounting hole; when the drum excavating shell is installed on the drum body, the installation bolt penetrates through the through hole and then is screwed into the threaded installation hole.
The coal mining roller comprises a cooling system, a cooling nozzle is arranged on the roller excavating shell, the cooling nozzle is arranged on the roller body and penetrates through a through hole of the cooling nozzle to extend out, the height of the cooling nozzle is smaller than that of a cutting pick, and a spray hole of the cooling nozzle is formed in a groove in the side wall of the cooling nozzle.
By adopting the technical scheme, the invention has the beneficial technical effects that:
1. the low-rotating-speed large-torque hydraulic drive coal mining machine roller has the advantages of no gear amplitude transmission and electrical part, simple structure, reasonable design, high reliability, large starting rate and convenient maintenance and overhaul.
The hydraulic drive coal mining machine drum, the cutting part and the rocker arm of the coal mining machine are rigidly connected, and the cutting drum has a small diameter and is suitable for mining thin coal seams or extremely thin coal seams with the height ranging from 0.6m to 1.3 m. The constant speed cutting mode of the drum of the coal mining machine at home and abroad is broken through, the variable speed cutting is realized, and the cutting efficiency is high. The high risk of the amplitude reduction transmission and the electric control failure rate of the internal gear of the rocker arm of the existing coal mining machine is avoided, the roller of the coal mining machine has no risk of torque shaft transmission fracture, the cost is reduced for coal mining, and the economic benefit is improved.
2. The outer wall of the roller is welded with a tooth holder, and the cutting teeth are arranged on the tooth holder of the roller. The cutting pick can be replaced when worn.
3. The drum mechanism of the coal mining machine is provided with a cooling system, the cooling system is provided with a nozzle, and the cooling nozzle is arranged on a guide plate in the middle of a cutting tooth.
4. The cutting mechanism is provided with no cutting motor and no gear amplitude power transmission system, and the hydraulic motor is installed at the tail end of the rocker arm and directly drives the drum to rotate. The problem of coal mining machine rocking arm cutting motor transversely arrange the below and cross the coal mouthful little is solved, gear width of cloth transmission system and cutting motor fault point have been reduced, cutting system bearing capacity, shock resistance are strong, the reliability is high.
5. The traction mechanism is not provided with a traction motor and a gear amplitude power transmission system, the thickness of the machine body is reduced, the contradiction between the height of the machine surface and the coal passing space is solved, and the advantages of low height of the machine surface and large coal passing space are formed. And an external traction mode is adopted, so that the traction force is large and the traction speed is high.
Drawings
Fig. 1 is a structural schematic diagram of a hydraulic drive thin coal seam mining machine.
Fig. 2 is a top view of a hydraulically driven thin seam shearer.
Fig. 3 is a side view of a hydraulically driven thin seam shearer.
Fig. 4 is a schematic structural view of the cutting part.
Fig. 5 is a schematic structural view of a coal mining drum.
FIG. 6 is a schematic view of the drum excavation housing.
FIG. 7 is a schematic view of a cooling nozzle configuration.
Fig. 8 is a schematic diagram of a hydraulic oil pipe layout.
In the figure: the hydraulic-driven thin coal seam mining machine comprises a hydraulic-driven thin coal seam mining machine 1, a cutting part 2, a coal mining drum 21, a drum excavating shell 211, a drum body 212, a positioning pin 213, a positioning groove 214, a through hole 215, a cooling nozzle 216, a spray hole 216a, a cutting pick 217, a cooling nozzle through hole 218, an output shaft 22, a hydraulic motor 23, a mining machine rocker arm 3, an external traction walking part 4, a traction wheel 41, a hydraulic oil pipe 5, a variable pump 51, an overflow valve 52, a filter 53, an automatic cable towing device 6 and a cable clamp plate 61.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in the figure, the hydraulic drive thin coal seam coal mining machine 1 comprises a cutting part 2, a coal mining machine rocker arm 3 and an external traction walking part 4; the cutting part 2 comprises a coal mining drum 21 and a hydraulic motor 23; an output shaft 22 is arranged on the hydraulic motor 23, and the hydraulic motor 23 is connected with the coal mining drum 21 through the output shaft 22; the hydraulic motor 23 is connected with an external pump station through a hydraulic oil pipe 5; the cutting part 2 is rigidly connected with a rocker arm 3 of the coal mining machine. The hydraulic motor 23 is a low-speed large-torque hydraulic motor, the diameter is 450mm-1350mm, the torque is 7000 nm-100 ten thousand nm, and the rotating speed is 10r/min-100 r/min. The hydraulic motor 23 can also be connected to the coal mining drum 21 via a hydraulic motor housing.
The large-torque hydraulic drive coal mining machine roller has the advantages of simple structure, reasonable design, high reliability, large starting rate and convenience in maintenance and overhaul. The external pump station provides power source, the hydraulic oil pipe 5 transmits the power to the hydraulic motor 23, the coal mining drum 21 is directly driven to rotate, and cutting of the coal wall is achieved. The links of torque increase of motor drive and intermediate gear transmission of the rocker arm of the existing coal mining machine are eliminated. A low-speed high-torque hydraulic motor 23 is selected, has the characteristics of good shaft sealing performance, strong bearing capacity, large output torque, wide rotating speed range, good low-speed stability, strong short-term overload capacity, strong impact resistance, high efficiency, long service life, small size and the like, and can be directly connected with a coal mining roller. The minimum diameter of the hydraulic motor is 450mm, and according to the characteristics of the coal mining roller 21 of the hydraulic drive thin coal seam coal mining machine 1, an ultra-thin coal seam coal mining machine for mining a coal seam with the thickness of 0.6m to 1.3m can be designed.
The hydraulic oil pipe 5 is provided with a variable pump 51 and an overflow valve 52. And a filter 53 is arranged at the joint of the hydraulic oil pipe 5 and the external pump station. When the hydraulic motor 23 provides power output, the cutting speed can be adjusted steplessly through the oil pressure change of a pump station and the control of the variable pump 51, and constant-power cutting can be realized. When the cutting resistance changes or the vibration load is overlarge, the coal mining drum 21 can automatically realize the protection control of buffering, speed reduction and torque increase, and overload protection is realized without a torque shaft. The coal mining roller 21 can realize the long-distance liquid supply of the gateway pump station,
the coal mining drum 21 includes a drum excavation shell 211 and a drum body 212; the drum excavating housing 211 is provided with picks 217. A positioning pin 213 is arranged on the drum digging shell 211, and a positioning groove 214 is arranged on the drum body 212; when the drum excavating housing 211 is mounted on the drum body 212, the positioning pins 213 are inserted into the positioning grooves 214; a through hole 215 is formed in the drum excavating shell 211, and a threaded mounting hole is formed in the drum body 212; when the drum excavating housing 211 is mounted on the drum body 212, the mounting bolts are inserted through the through holes 215 and screwed into the threaded mounting holes. The coal mining drum 21 is provided with a removable drum excavation housing 211, and a cutting pick 217 is mounted on the drum excavation housing 211. A plurality of positioning pins 213 are arranged on the drum digging shell 211, and a plurality of positioning grooves 214 are correspondingly arranged on the drum body 212; the drum excavating housing 211 is fixedly coupled to the drum body 212 by coupling bolts. When the coal mining drum 21 is in operation, the positioning pins 213 can disperse the lateral force applied to the rotation of the drum excavation shell 211, reduce the impact force applied to the mounting bolts, and reduce the risk of deformation of the mounting bolts.
The coal mining drum 21 comprises a cooling nozzle 216, a cooling nozzle through hole 218 is formed in the drum excavation shell 211, the cooling nozzle 216 is arranged on the drum body 21 and extends out through the cooling nozzle through hole 218, the height 216 of the cooling nozzle is smaller than that of a cutting pick 217, and a spray hole 216a of the cooling nozzle 216 is formed in a groove in the side wall of the cooling nozzle 216. Facilitates spraying of the coolant to the cutting pick 217 while reducing the risk of the holes 216a being damaged during operation of the coal mining drum 21.
The external traction walking part 4 is provided with an automatic cable towing device 6, the automatic cable towing device 6 comprises a cable clamp plate 61, and the hydraulic oil pipe 5 is installed in the cable clamp plate 61.
The automatic towing device 6 is configured to ensure that the cable clamp plate 61 moves flexibly and protect cables, water pipes and oil pipes from being damaged. The automatic cable towing device 6 is a cable towing device which travels synchronously with the hydraulic drive thin coal seam coal mining machine 1 so as to ensure that the cable clamp plate moves flexibly. The cables (such as a power supply cable, a hydraulic system rubber pipe, a cooling spraying system rubber pipe and the like) of the hydraulic drive thin seam coal mining machine 1 can be arranged in the cable clamp plate 61 and used for protecting the cables from being damaged. The existing coal mining machine towing device is a safety device which is dragged by a coal mining machine and protects a cable and a water pipe when the coal mining machine walks, the cable and the water pipe walk together by dragging a cable clamping plate through the traction of the coal mining machine during working, and the cable and the water pipe are easy to bend and extrude and are worn or damaged during long-time working. Particularly, when the coal mining machine is used for dragging and reversing the head, the tail and the oblique cutting feed of the scraper conveyor in a reciprocating manner, the phenomenon of multilayer overlapping and feeding is caused, the cable clamp plates are easy to separate from a cable trough, and meanwhile, when the coal mining machine is used for cutting coal at the lowest mining height, the cable clamp plates are stacked more and have overlarge bending radius, and the hydraulic support is easy to press the cable clamp plates to be dead, so that the cable and the water pipe are damaged, and great potential safety hazards exist. In order to meet the requirements of intelligent and efficient mining of an ultra-thin coal seam, the automatic towing device of the coal mining machine is researched and designed, the automatic towing device can ensure that a cable clamp plate is in a flat state when the coal mining machine repeatedly travels in a reciprocating mode, the coal mining machine is prevented from towing the cable clamp plate to be bent and damaged, and the reliability and the safety of the towing device of the coal mining machine are effectively improved. (different from the existing structure)
The outer traction walking part 4 is provided with a traction wheel 41, and the traction wheel 41 can be meshed with a traction pin rail on the scraper conveyor. The external traction means that the external traction walking part 4 drives the external traction walking part 4 to walk along the direction of the scraper conveyor through the action of traction motors, speed reducers and traction pin rails at the two ends of the scraper conveyor. The traction wheel 41 is meshed with a traction pin rail on the scraper conveyor, so that the outer traction walking part 4 walks along the direction of the scraper conveyor in the coal face. The existing coal mining machine mostly adopts a chainless electric traction mode, and the coal mining machine drives the coal mining machine to move through a traction motor and a gear reducer which are arranged on the coal mining machine. The thin seam coal mining machine is limited by the sizes of a motor, a gear transmission system and the like, so that the thickness of the machine body cannot be too thin, and the contradiction among the traction power, the machine face height and the coal passing space is effectively solved by developing the traction walking part.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
The hydraulic-driven thin coal seam mining machine comprises a hydraulic-driven thin coal seam mining machine 1, a cutting part 2, a coal mining drum 21, a drum excavating shell 211, a drum body 212, a positioning pin 213, a positioning groove 214, a through hole 215, a cooling nozzle 216, a spray hole 216a, a cutting pick 217, a cooling nozzle through hole 218, an output shaft 22, a hydraulic motor 23, a mining machine rocker arm 3, an external traction walking part 4, a traction wheel 41, a hydraulic oil pipe 5, a variable pump 51, an overflow valve 52, a filter 53, an automatic cable towing device 6 and a cable clamp plate 61.
Claims (10)
1. The utility model provides a hydraulic drive thin coal seam coal-winning machine which characterized in that: comprises a cutting part, a rocker arm of a coal mining machine and an external traction walking part; the cutting part comprises a coal mining drum and a hydraulic motor; the hydraulic motor provides power for the coal mining roller; the hydraulic motor is connected with an external variable pump station through a hydraulic oil pipe, and a supercharging device is arranged on the hydraulic oil pipe; the cutting part is rigidly connected with a rocker arm of the coal mining machine.
2. A hydraulically driven low seam mining machine as claimed in claim 1, wherein: the hydraulic motor is connected with the coal mining roller through an output shaft.
3. A hydraulically driven low seam mining machine as claimed in claim 1, wherein: the hydraulic motor is connected with the coal mining roller through a hydraulic motor output shaft.
4. A hydraulically driven low seam mining machine as claimed in claim 1, wherein: the hydraulic motor is a low-rotating-speed high-torque hydraulic motor, the diameter of the hydraulic motor is 450mm-1350mm, the torque of the hydraulic motor is 7000 nm-100 ten thousand nm, and the rotating speed of the hydraulic motor is 10r/min-100 r/min.
5. A hydraulically driven low seam mining machine as claimed in claim 1 or 2, characterized by: the hydraulic oil pipe is connected to the variable pump.
6. A hydraulically driven low seam mining machine as claimed in claim 1 or 2, characterized by: an overflow valve and a safety valve are arranged on the hydraulic oil pipe; and a filter is arranged at the joint of the hydraulic oil pipe and the external pump station.
7. A hydraulically driven low seam mining machine as claimed in claim 1 or 2, characterized by: the outer traction walking part is provided with an automatic oil dragging pipe device, the automatic oil dragging pipe device comprises an oil pipe movable connector and a clamping plate, and the hydraulic oil pipe is installed in the clamping plate.
8. A hydraulically driven low seam mining machine as claimed in claim 7, wherein: and the outer traction walking part is provided with a walking wheel or a traction chain, and the walking wheel can be meshed with a traction pin rail on the scraper conveyor or realize chain traction.
9. A hydraulically driven low seam mining machine as claimed in claim 1 or 2, characterized by: the coal mining roller comprises a hydraulic motor roller body, and a roller excavating shell; a cutting pick is arranged on the drum excavating shell; the roller excavating shell is provided with a positioning pin, and the roller body is provided with a positioning groove; when the roller excavating shell is arranged on the roller body, the positioning pin is inserted into the positioning groove; the drum excavating shell is provided with a through hole, and the drum body is provided with a threaded mounting hole; when the drum excavating shell is installed on the drum body, the installation bolt penetrates through the through hole and then is screwed into the threaded installation hole.
10. A hydraulically driven low seam mining machine as claimed in claim 1 or 2, characterized by: the coal mining roller comprises a cooling system, a cooling nozzle is arranged on the roller excavating shell, the cooling nozzle is arranged on the roller body and penetrates through a through hole of the cooling nozzle to extend out, the height of the cooling nozzle is smaller than that of a cutting pick, and a spray hole of the cooling nozzle is formed in a groove in the side wall of the cooling nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443725.3A CN111608655A (en) | 2020-05-22 | 2020-05-22 | Hydraulic drive thin coal seam coal mining machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010443725.3A CN111608655A (en) | 2020-05-22 | 2020-05-22 | Hydraulic drive thin coal seam coal mining machine |
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| CN111608655A true CN111608655A (en) | 2020-09-01 |
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Citations (11)
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|---|---|---|---|---|
| US4328996A (en) * | 1979-07-11 | 1982-05-11 | Gebr. Eickhoff Maschinenfabrik Und Eisengiesserei M.B.H. | Cutter drum support arm for longwall mining machine |
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| CN201053320Y (en) * | 2007-03-29 | 2008-04-30 | 辽源煤矿机械厂 | Low coal seam hydraulic drag coal cutter |
| CN102777173A (en) * | 2012-08-10 | 2012-11-14 | 江苏中机矿山设备有限公司 | Cantilever type electric traction coal cutter |
| CN102900436A (en) * | 2012-11-01 | 2013-01-30 | 中国矿业大学 | Cylinder stepping type thin seam coal mining machine |
| CN103590829A (en) * | 2013-11-25 | 2014-02-19 | 江苏中机矿山设备有限公司 | Four-roller coal cutter adopting double-roller cutting parts |
| CN103603662A (en) * | 2013-09-29 | 2014-02-26 | 江苏中机矿山设备有限公司 | Coal cutter for thin coal layer |
| CN204140062U (en) * | 2014-08-11 | 2015-02-04 | 天地上海采掘装备科技有限公司 | Cantilevered girdle high-power coal cutter |
| CN106351656A (en) * | 2016-10-21 | 2017-01-25 | 南京六合佳源矿山设备有限公司 | Cutting part of stepless speed changing coal cutter based on hydraulic closed transmission system |
| CN106609672A (en) * | 2015-10-21 | 2017-05-03 | 田荣侠 | Oil cylinder stepping type thin coal seam coal-mining machine traction part and hydraulic system |
| CN110080759A (en) * | 2019-06-04 | 2019-08-02 | 中国矿业大学 | A kind of abradant jet coalcutter that maximum mining height can increase |
-
2020
- 2020-05-22 CN CN202010443725.3A patent/CN111608655A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4328996A (en) * | 1979-07-11 | 1982-05-11 | Gebr. Eickhoff Maschinenfabrik Und Eisengiesserei M.B.H. | Cutter drum support arm for longwall mining machine |
| CN2594462Y (en) * | 2002-10-31 | 2003-12-24 | 峰峰矿务局机械总厂 | Drum coal-mining machines for low seam |
| CN201053320Y (en) * | 2007-03-29 | 2008-04-30 | 辽源煤矿机械厂 | Low coal seam hydraulic drag coal cutter |
| CN102777173A (en) * | 2012-08-10 | 2012-11-14 | 江苏中机矿山设备有限公司 | Cantilever type electric traction coal cutter |
| CN102900436A (en) * | 2012-11-01 | 2013-01-30 | 中国矿业大学 | Cylinder stepping type thin seam coal mining machine |
| CN103603662A (en) * | 2013-09-29 | 2014-02-26 | 江苏中机矿山设备有限公司 | Coal cutter for thin coal layer |
| CN103590829A (en) * | 2013-11-25 | 2014-02-19 | 江苏中机矿山设备有限公司 | Four-roller coal cutter adopting double-roller cutting parts |
| CN204140062U (en) * | 2014-08-11 | 2015-02-04 | 天地上海采掘装备科技有限公司 | Cantilevered girdle high-power coal cutter |
| CN106609672A (en) * | 2015-10-21 | 2017-05-03 | 田荣侠 | Oil cylinder stepping type thin coal seam coal-mining machine traction part and hydraulic system |
| CN106351656A (en) * | 2016-10-21 | 2017-01-25 | 南京六合佳源矿山设备有限公司 | Cutting part of stepless speed changing coal cutter based on hydraulic closed transmission system |
| CN110080759A (en) * | 2019-06-04 | 2019-08-02 | 中国矿业大学 | A kind of abradant jet coalcutter that maximum mining height can increase |
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