CN202926325U - Alternative-current traction coal mining machine of thin coal seam - Google Patents
Alternative-current traction coal mining machine of thin coal seam Download PDFInfo
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- CN202926325U CN202926325U CN 201220589423 CN201220589423U CN202926325U CN 202926325 U CN202926325 U CN 202926325U CN 201220589423 CN201220589423 CN 201220589423 CN 201220589423 U CN201220589423 U CN 201220589423U CN 202926325 U CN202926325 U CN 202926325U
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- 239000003245 coal Substances 0.000 title abstract description 16
- 238000005065 mining Methods 0.000 title abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 63
- 230000009467 reduction Effects 0.000 claims abstract description 30
- 238000013461 design Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 15
- 230000009184 walking Effects 0.000 claims description 9
- 210000003464 cuspid Anatomy 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000013024 troubleshooting Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006386 memory function Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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Abstract
The utility model relates to an alternative-current traction coal mining machine of a thin coal seam, and relates to coal mining equipment. The alternative-current traction coal mining machine of the thin coal seam is characterized in that an electric control box (7) is connected with a left traction part (1) and a right traction part (2) simultaneously by means of being matched with a hydraulic nut (9) through a high-strength bolt (8); the left traction part (1) and a left cutting part (3) are hinged through a pin shaft (10), and the right traction part (2) and a right cutting part (4) are hinged through the pin shaft (10); the left traction part (1) and a hydraulic height adjusting system are integrally designed to be in an integrated structure; the left traction part (1) and the right traction part (2) use five-stage speed reduction, and have an overall gear ratio i of 322.7; and the left cutting part (3) and the right cutting part (4) are in the same structure, use four-stage speed reduction, and have an overall gear ratio i of 22. The alternative-current traction coal mining machine of the thin coal seam is compact in structural design, good in integral connectability, convenient to dismount and mount and convenient for repairing and maintenance.
Description
Technical field
Girdle alternating current traction coal-winning machine relates to a kind of coal excavation apparatus, is specifically related to a kind of alternating current traction coal-winning machine for the girdle coal mining.
Background technology
China's girdle aboundresources distribute wide, and ature of coal is good.The reserves of national girdle account for 20% of whole recoverable reserves according to statistics.Many coals district has a large amount of Protective Coal Seams also anxious to be developed.Therefore, do the low seam mining machinery tool well, improve the production efficiency of girdle, become the vital task of China's energy industry.According to present situation, during the coal-winning machine of China is produced, in thick and development high seam coal mining machine advance by leaps and bounds, make rapid progress, basically reached the international most advanced level of the nineties.the development of low seam mining machinery is slower, for example, the MG100-T Series Coal Shearer has used nearly three more than ten years, although obtained very large achievement, but also there are some problems, mainly comprise: structure design is loose, dismounting inconvenience, whole connection is bad, rigidity is relatively poor, and from structure with technically also seemed backward, and G100/111-TD, the MG100/111-TDP Series Coal Shearer adopts unit to drive, its mechanical drive train is long, complex structure, connection between each large parts is firm by means of bottom bracket, cause the connection between each parts unreliable, easily loosening, thereby cause between each parts axis crooked, damage parts, the coal-winning machine operating efficiency is greatly affected.Become the task of top priority so develop the low seam mining machinery of novel, high reliability and applicability.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, provide that a kind of structure design is compact, whole connection is good, easy accessibility, be convenient to keep in repair and the girdle alternating current traction coal-winning machine of safeguarding.
the technical scheme that its technical problem that solves the utility model adopts is: this girdle alternating current traction coal-winning machine, comprise electric control box, be arranged on the left tractive unit in electric control box left side, left cutting units, cylinder rolls left, be arranged on the right tractive unit on electric control box right side, right cutting units, right cylinder, it is characterized in that: electric control box by high-strength bolt coordinate hydraulic nut simultaneously with left tractive unit be connected tractive unit and be connected, all hinged by bearing pin between left tractive unit and left cutting units and right tractive unit and right cutting units, left tractive unit and hydraulic pressure is transferred the high system Integration Design are structure as a whole, left tractive unit and right tractive unit all adopt Pyatyi to slow down, overall ratio i=322.7, left cutting units is identical with right cutting units structure, all adopt level Four to slow down, overall ratio i=22.Electric control box by high-strength bolt coordinate hydraulic nut simultaneously with left tractive unit be connected tractive unit and be connected, improved complete machine intensity, all hinged by bearing pin between left tractive unit and left cutting units and right tractive unit and right cutting units, there is no transmission of power, compared with the past, cancelled the complicated transmission mechanism of spiral bevel gear, whole connection is good, easy accessibility.
Described left tractive unit and right tractive unit include traction electric machine, motor shaft group, power transmission shaft group, idler shaft group, planetary mechanism and walking mechanism, planetary mechanism comprises the first planetary reduction gear and the second planetary reduction gear, and walking mechanism comprises that the number of teeth is that 8 road wheel and the number of teeth are 6 driving wheel; The traction electric machine output shaft is connected with the motor shaft group by spline coupling, connect driving wheel after process idler shaft group, power transmission shaft group, the first planetary reduction gear and the planetary reduction gear of being connected slow down successively, the drive wheel road wheel, road wheel and pin rail engagement walking, realize resultant gear ratio i=322.7, the road wheel overcoat has guide slip shoe.When road wheel meshes with the pin rail of laying along conveyer, except producing larger tractive force, also produce simultaneously a larger radial load, the trend that it lifts fuselage on having, at the road wheel overcoat, guide slip shoe is arranged, restriction coal-winning machine fuselage shifted laterally with on lift, the normal engagement of assurance road wheel and pin rail.
Described left tractive unit casing right side design and installation has the pump box of heightening of one, heightens pump box right side installation and heightens pump motor, and is simple in structure, compact, reliable operation.
Described left cutting units is identical with right cutting units structure, include rocking arm, cutting motor and gear reduction box, cutting motor is arranged in rocking arm, the cutting motor output shaft is connected with an axle in gear reduction box by spline, one axle rear portion connects two axles, three axles, four axles, idler shaft, canine tooth wheels and planetary reduction gear successively, realizes resultant gear ratio i=22.Cutting motor is arranged in rocking arm, adopt the motor-driven of a 132kW on each rocking arm, to satisfy needs high-power and low machine height, left cutting units and right cutting units can start respectively separately, be convenient to troubleshooting, reduce simultaneously because starting coal-winning machine to the impact of electrical network.
Described roll left cylinder be connected cylinder and connect respectively the planetary reduction gear of left cutting units and right cutting units.
The guidance panel of described electric control box is provided with colorful display screen, can detect at any time the coal-winning machine operating mode, and the fault memory function is arranged, and also is provided with the display interfaces such as operation troubleshooting data, accident analysis reference, main driving member inquiry.
Totally two, described rocking arm, hinged by bearing pin and left tractive unit and right tractive unit respectively; that revolving rocker arm adopts articulated structure, there is no machine driving with the coal-winning machine fuselage, the loosening of the wearing and tearing of rotating part and fuselage connecting bolt can not have a negative impact to the travelling gear engagement; Straight spur gear is adopted in the rocker gear transmission, and simple in structure, transmission efficiency is high.
Compared with prior art, the beneficial effect that has of the utility model is:
1, improve that complete machine intensity, body connection are good, easy accessibility: electric control box coordinates hydraulic nut while and left tractive unit and is connected tractive unit and is connected by high-strength bolt, improved complete machine intensity, all hinged by bearing pin between left tractive unit and left cutting units and right tractive unit and right cutting units, there is no transmission of power, compared with the past, cancelled the complicated transmission mechanism of spiral bevel gear, whole connection is good, easy accessibility;
2, reasonable in design, be convenient to safeguard; Cutting motor is arranged in rocking arm, adopt the motor-driven of a 132kW on each rocking arm, to satisfy needs high-power and low machine height, left cutting units and right cutting units can start respectively separately, be convenient to troubleshooting, reduce simultaneously because starting coal-winning machine to the impact of electrical network;
3, compact to design, simple in structure: left tractive unit casing right side is designed with the pump box of heightening of one, heightens the pump box right side and installs and heighten pump motor, and is simple in structure, compact, reliable operation.
Description of drawings
Fig. 1 is the utility model structural front view.
Fig. 2 is the utility model structure top view.
Fig. 3 is left tractive unit sectional view.
Fig. 4 is right tractive unit sectional view.
Fig. 5 is left cutting units sectional view.
Fig. 6 is right cutting units sectional view.
wherein: 1, left tractive unit 2, right tractive unit 3, left cutting units 4, right cutting units 5, cylinder 6 rolls left, right cylinder 7, electric control box 8, high-strength bolt 9, hydraulic nut 10, bearing pin 11, motor shaft group 12, power transmission shaft group 13, idler shaft group 14, traction electric machine 15, the first planetary reduction gear 16, the second planetary reduction gear 17, road wheel 18, driving wheel 19, guide slip shoe 20, cutting motor 21, gear reduction box 22, one axle 23, two axles 24, three axles 25, four axles 26, idler shaft 27, canine tooth wheels 28, planetary reduction gear 29, colorful display screen 30, rocking arm 31, heighten pump box 32, heighten pump motor 33, the pin rail.
The specific embodiment
Fig. 1 ~ 6th, most preferred embodiment of the present utility model is described further below in conjunction with 1 ~ 6 pair of the utility model of accompanying drawing.
with reference to accompanying drawing 1: this girdle alternating current traction coal-winning machine, comprise electric control box 7, be arranged on the left tractive unit 1 in electric control box 7 left sides, left cutting units 3, cylinder 5 rolls left, be arranged on the right tractive unit 2 on electric control box 7 right sides, right cutting units 4, right cylinder 6, the guidance panel of electric control box 7 is provided with colorful display screen 29, can detect at any time the coal-winning machine operating mode, and the fault memory function arranged, also be provided with the operation troubleshooting data, the accident analysis reference, the display interfaces such as main driving member inquiry, electric control box 7 by high-strength bolt 8 coordinate hydraulic nuts 9 simultaneously with left tractive unit 1 be connected tractive unit 2 and be connected, improved complete machine intensity, all hinged by bearing pin 10 between left tractive unit 1 and left cutting units 3 and right tractive unit 2 and right cutting units 4, there is no transmission of power, compared with the past, cancelled the complicated transmission mechanism of spiral bevel gear, whole connection is good, easy accessibility.Left tractive unit 1 is structure as a whole with the hydraulic pressure is transferred the high system Integration Design, and left tractive unit 1 and right tractive unit 2 all adopt Pyatyi to slow down, overall ratio i=322.7, and left cutting units 3 is identical with right cutting units 4 structures, all adopts level Four to slow down, overall ratio i=22.
As shown in Figure 3-4: left tractive unit 1 and right tractive unit 2 include traction electric machine 14, motor shaft group 11, power transmission shaft group 12, idler shaft group 13, planetary mechanism and walking mechanism, planetary mechanism comprises the first planetary reduction gear 15 and the second planetary reduction gear 16, and walking mechanism comprises that the number of teeth is that 8 road wheel 17 and the number of teeth are 6 driving wheel 18; Traction electric machine 14 output shafts are connected with motor shaft group 11 by spline coupling, connection driving wheel 18 after process idler shaft group 13, power transmission shaft group 12, the first planetary reduction gear 15 and the planetary reduction gear 16 of being connected slow down successively, driving wheel 18 ground-engaging wheels 17, road wheel 17 and the 33 engagement walkings of pin rail, realize resultant gear ratio i=322.7, road wheel 17 overcoats have guide slip shoe 19.When road wheel 17 meshes with the pin rail 33 of laying along conveyer, except producing larger tractive force, also produce simultaneously a larger radial load, the trend that it lifts the coal-winning machine fuselage on having, at road wheel 17 overcoats, guide slip shoe 19 is arranged, restriction coal-winning machine fuselage shifted laterally with on lift, guarantee the normal engagement of road wheel 17 and pin rail 33.What left tractive unit 1 casing right side design and installation had an one heightens pump box 31, heightens pump box 31 right sides and installs and heighten pump motor 32, simple in structure, compact, reliable operation.
As shown in Fig. 5-6: left cutting units 3 is identical with right cutting units 4 structures, include rocking arm 30, cutting motor 20 and gear reduction box 21; totally two, rocking arm 30; hinged with left tractive unit 1 and right tractive unit 2 by bearing pin 10 respectively; articulated structure is adopted in rocking arm 30 revolutions; there is no machine driving with the coal-winning machine fuselage, the loosening of the wearing and tearing of rotating part and fuselage connecting bolt can not have a negative impact to the travelling gear engagement; Straight spur gear is adopted in rocking arm 30 gear drives, and simple in structure, transmission efficiency is high.Cutting motor 20 is arranged in rocking arm 30, cutting motor 20 output shafts are connected by the interior axle 22 of spline and gear reduction box 21, one axle 22 rear portions connect two axles 23, three axles 24, four axles 25, idler shaft 26, canine tooth wheels 27 and planetary reduction gear 28 successively, realize resultant gear ratio i=22.Roll left cylinder 5 be connected cylinder 6 and connect respectively the planetary reduction gear 28 of left cutting units 3 and right cutting units 4.Cutting motor 20 is arranged in rocking arm 30, adopt the motor-driven of a 132kW on each rocking arm 30, to satisfy needs high-power and low machine height, left cutting units 3 and right cutting units 4 can start respectively separately, be convenient to troubleshooting, reduce simultaneously because starting coal-winning machine to the impact of electrical network.
This girdle alternating current traction coal-winning machine material adopts the high-quality cast alloy steel, and has very high intensity through after specific heat treatment, key components and parts adopts the high-precision machine toolings such as numerical control machining center, digital-control boring-milling machine, after left cutting units 3, right cutting units 4, left tractive unit 1 and right tractive unit 2 install, carry out specific load test, and carry out complete machine test running test, whole process has been guaranteed overall performance.
The above, it is only preferred embodiment of the present utility model, be not to be the utility model to be done the restriction of other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (7)
1. girdle alternating current traction coal-winning machine, comprise electric control box (7), be arranged on the left tractive unit (1) in electric control box (7) left side, left cutting units (3), cylinder (5) rolls left, be arranged on the right tractive unit (2) on electric control box (7) right side, right cutting units (4), right cylinder (6), it is characterized in that: electric control box (7) by high-strength bolt (8) coordinate hydraulic nut (9) simultaneously with left tractive unit (1) be connected tractive unit (2) and be connected, all hinged by bearing pin (10) between left tractive unit (1) and left cutting units (3) and right tractive unit (2) and right cutting units (4), left tractive unit (1) is structure as a whole with the hydraulic pressure is transferred the high system Integration Design, left tractive unit (1) and right tractive unit (2) all adopt Pyatyi to slow down, overall ratio i=322.7, left cutting units (3) is identical with right cutting units (4) structure, all adopt level Four to slow down, overall ratio i=22.
2. girdle alternating current traction coal-winning machine according to claim 1, it is characterized in that: described left tractive unit (1) and right tractive unit (2) include traction electric machine (14), motor shaft group (11), power transmission shaft group (12), idler shaft group (13), planetary mechanism and walking mechanism, planetary mechanism comprises the first planetary reduction gear (15) and the second planetary reduction gear (16), and walking mechanism comprises that the number of teeth is that 8 road wheel (17) and the number of teeth are 6 driving wheel (18); Traction electric machine (14) output shaft is connected with motor shaft group (11) by spline coupling, pass through successively and connect driving wheel (18) after idler shaft group (13), power transmission shaft group (12), the first planetary reduction gear (15) and the planetary reduction gear (16) of being connected slow down, driving wheel (18) ground-engaging wheel (17), road wheel (17) and pin rail (33) engagement walking, realize resultant gear ratio i=322.7, road wheel (17) overcoat has guide slip shoe (19).
3. arbitrary described girdle alternating current traction coal-winning machine according to claim 1 and 2 is characterized in that: what described left tractive unit (1) casing right side design and installation had an one heightens pump box (31), heightens pump box (31) right side and installs and heighten pump motor (32).
4. girdle alternating current traction coal-winning machine according to claim 1, it is characterized in that: described left cutting units (3) is identical with right cutting units (4) structure, include rocking arm (30), cutting motor (20) and gear reduction box (21), cutting motor (20) is arranged in rocking arm (30), cutting motor (20) output shaft is connected by the interior axle (22) of spline and gear reduction box (21), one axle (22) rear portion connects two axles (23) successively, three axles (24), four axles (25), idler shaft (26), canine tooth wheels (27) and planetary reduction gear (28), realize resultant gear ratio i=22.
5. girdle alternating current traction coal-winning machine according to claim 1 is characterized in that: described roll left cylinder (5) be connected cylinder (6) and connect respectively the planetary reduction gear (28) of left cutting units (3) and right cutting units (4).
6. girdle alternating current traction coal-winning machine according to claim 1, it is characterized in that: the guidance panel of described electric control box (7) is provided with colorful display screen (29).
7. girdle alternating current traction coal-winning machine according to claim 4 is characterized in that: totally two, described rocking arm (30), and hinged with left tractive unit (1) and right tractive unit (2) by bearing pin (10) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220589423 CN202926325U (en) | 2012-11-10 | 2012-11-10 | Alternative-current traction coal mining machine of thin coal seam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220589423 CN202926325U (en) | 2012-11-10 | 2012-11-10 | Alternative-current traction coal mining machine of thin coal seam |
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| CN202926325U true CN202926325U (en) | 2013-05-08 |
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| CN 201220589423 Expired - Lifetime CN202926325U (en) | 2012-11-10 | 2012-11-10 | Alternative-current traction coal mining machine of thin coal seam |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103670398A (en) * | 2013-11-21 | 2014-03-26 | 王庆军 | Cutting disc type heading machine cutting device |
| CN103924970A (en) * | 2014-05-05 | 2014-07-16 | 湖南科技大学 | Two-arm and four-roller coal mining machine |
| CN104929635A (en) * | 2015-05-08 | 2015-09-23 | 平顶山天安煤业股份有限公司 | Adjustment method for cutting height of chain type cutting unit |
| CN107035368A (en) * | 2016-11-28 | 2017-08-11 | 哈尔滨博业科技开发有限责任公司 | Suddenly incline pseudo- tiltedly shearer hauled-part of bowing |
| CN108131141A (en) * | 2017-12-21 | 2018-06-08 | 重庆永荣机械制造有限责任公司 | Rocker-arm hydraulic haulage shearer |
| CN110630258A (en) * | 2019-10-22 | 2019-12-31 | 西安煤矿机械有限公司 | Traction box of thin coal seam coal mining machine |
| CN111411957A (en) * | 2020-05-22 | 2020-07-14 | 天地科技股份有限公司上海分公司 | Traction system of thin coal seam coal mining machine |
| CN111411951A (en) * | 2020-05-22 | 2020-07-14 | 天地科技股份有限公司上海分公司 | Thin coal seam short fuselage shearer |
| CN111425201A (en) * | 2020-05-22 | 2020-07-17 | 天地科技股份有限公司上海分公司 | Thin seam coal mining machine body |
| CN112112645A (en) * | 2020-09-17 | 2020-12-22 | 哈尔滨博业科技开发有限责任公司 | Ultra-thin coal seam strides connecting shaft type and combines to adopt supporting cutting part |
| CN112855147A (en) * | 2021-02-25 | 2021-05-28 | 天地上海采掘装备科技有限公司 | Compact transmission connection structure of cutting main body part of coal mining machine |
| CN113202467A (en) * | 2021-06-17 | 2021-08-03 | 天地上海采掘装备科技有限公司 | H-shaped cutting device and high-power thin coal seam coal mining machine |
-
2012
- 2012-11-10 CN CN 201220589423 patent/CN202926325U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103670398A (en) * | 2013-11-21 | 2014-03-26 | 王庆军 | Cutting disc type heading machine cutting device |
| CN103924970A (en) * | 2014-05-05 | 2014-07-16 | 湖南科技大学 | Two-arm and four-roller coal mining machine |
| CN104929635A (en) * | 2015-05-08 | 2015-09-23 | 平顶山天安煤业股份有限公司 | Adjustment method for cutting height of chain type cutting unit |
| CN107035368A (en) * | 2016-11-28 | 2017-08-11 | 哈尔滨博业科技开发有限责任公司 | Suddenly incline pseudo- tiltedly shearer hauled-part of bowing |
| CN108131141A (en) * | 2017-12-21 | 2018-06-08 | 重庆永荣机械制造有限责任公司 | Rocker-arm hydraulic haulage shearer |
| CN108131141B (en) * | 2017-12-21 | 2024-04-16 | 重庆永荣机械制造有限责任公司 | Rocker arm type hydraulic traction coal mining machine |
| CN110630258A (en) * | 2019-10-22 | 2019-12-31 | 西安煤矿机械有限公司 | Traction box of thin coal seam coal mining machine |
| CN111411951A (en) * | 2020-05-22 | 2020-07-14 | 天地科技股份有限公司上海分公司 | Thin coal seam short fuselage shearer |
| CN111425201A (en) * | 2020-05-22 | 2020-07-17 | 天地科技股份有限公司上海分公司 | Thin seam coal mining machine body |
| CN111411957A (en) * | 2020-05-22 | 2020-07-14 | 天地科技股份有限公司上海分公司 | Traction system of thin coal seam coal mining machine |
| CN111411951B (en) * | 2020-05-22 | 2025-06-10 | 天地科技股份有限公司上海分公司 | Short-body coal cutter for thin coal seam |
| CN112112645A (en) * | 2020-09-17 | 2020-12-22 | 哈尔滨博业科技开发有限责任公司 | Ultra-thin coal seam strides connecting shaft type and combines to adopt supporting cutting part |
| CN112112645B (en) * | 2020-09-17 | 2022-06-24 | 哈尔滨博业科技开发有限责任公司 | Ultra-thin coal seam strides connecting shaft type and combines to adopt supporting cutting part |
| CN112855147A (en) * | 2021-02-25 | 2021-05-28 | 天地上海采掘装备科技有限公司 | Compact transmission connection structure of cutting main body part of coal mining machine |
| CN113202467A (en) * | 2021-06-17 | 2021-08-03 | 天地上海采掘装备科技有限公司 | H-shaped cutting device and high-power thin coal seam coal mining machine |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130508 |