CN103924970A - Two-arm and four-roller coal mining machine - Google Patents

Two-arm and four-roller coal mining machine Download PDF

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Publication number
CN103924970A
CN103924970A CN201410192477.4A CN201410192477A CN103924970A CN 103924970 A CN103924970 A CN 103924970A CN 201410192477 A CN201410192477 A CN 201410192477A CN 103924970 A CN103924970 A CN 103924970A
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CN
China
Prior art keywords
rocking arm
gear
arms
height
coal mining
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Pending
Application number
CN201410192477.4A
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Chinese (zh)
Inventor
黄靖龙
邓孔书
杨高平
吴凤波
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Hunan University of Science and Technology
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Hunan University of Science and Technology
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Application filed by Hunan University of Science and Technology filed Critical Hunan University of Science and Technology
Priority to CN201410192477.4A priority Critical patent/CN103924970A/en
Publication of CN103924970A publication Critical patent/CN103924970A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a two-arm and four-roller coal mining machine, and belongs to the technical field of coal mine machines. The two-arm and four-roller coal mining machine comprises a traction part, a motor, a drive part, rocker arms and a height-regulating device. The motor is connected with the drive part and used for supplying power to the two-arm and four-roller coal mining machine. The drive part is connected with the two rocker arms, namely the first rocker arm and the second rocker arm, and each rocker arm is connected with two sets of rollers. The traction part is connected with traction equipment and used for driving the entire two-arm and four-roller coal mining machine to move. Due to the fact that the two-arm and four-roller coal mining machine is provided with four rollers, the coal mining area is greatly increased, and the sizes of the rollers can be changed according to actual needs. A worm and gear device is used for regulating the coal mining height, so that energy saving and environmental protection are achieved. According to the coal mining machine, the left-right vacillating coal mining height can be regulated according to actual terrain, and thus the adaptability of the coal mining machine is enhanced. The two-arm and four-roller coal mining machine has the advantages of being large in coal mining area, high in coal mining efficiency, adjustable in coal mining height, high in adaptability, saving in energy and environmentally friendly.

Description

Both arms four flittings
Technical field
The invention belongs to coal mining field of mechanical technique, particularly a kind of both arms four flittings that are applicable to half-edge coal seam.
Technical background
The equipment of coal-cutting machinery is one of important symbol of colliery technical level.Coal-cutting machinery select the occurrence condition that depends on coal seam.
The storage capacity in coal seam, the anxious inclination angle of China accounts for greatly 14.05% of coal gross storage capacity, these coal seams are mainly distributed in the provinces (district) such as Sichuan, Xinjiang, Guangdong, Fujian, Gansu, the Inner Mongol and the northeast of China, the annual production in coal seam, anxious inclination angle accounts for greatly 8%~10% of national coal total output, occupy very large ratio but economize (district) large-inclination-angle coal bed output at some, as come from coal seam, anxious inclination angle at the coal production in Sichuan Province 40%~50%.At present, the mechanical mining of China's half-edge coal seam equipment can't meet the demand of China, therefore, develops strong adaptability, highly efficient and productive coal-winning machine is very important with the demand that adapts to coal in China exploitation.
Summary of the invention
For addressing the above problem, meet the demand of steeply-inclined seam mining, the invention provides a kind of both arms four flittings that are applicable to half-edge coal seam.The features such as this coal-winning machine has that coal mining area is large, coal mining efficiency is high, it is highly adjustable to mine, strong adaptability and energy-conserving and environment-protective.
To achieve these goals, the present invention has taked following technical scheme:
A kind of both arms four flittings, comprise tractive unit, motor, and running part, rocking arm and height-regulating device; Motor connection for transmission part, and provide power for both arms four flittings; Running part connects two rocking arms, i.e. the first rocking arm and the second rocking arm, and each rocking arm connects respectively two series cylinders; Described tractive unit connects pulling equipment, drives whole both arms four flitting motions.
Further, described running part comprises the axle that is in transmission connection of transmission case body and transmission case body inside, and symmetrically arranged the first transmission device and the second transmission device, the first transmission device and the second transmission device comprise respectively interconnective first gear, one or more the second gear and the 3rd gear, wherein, the 3rd gear connection for transmission connecting axle, the first gear connecting rocker arm connecting axle.
Further, the first gear outside is with transmission case body end cap; rocking arm connecting axle is affixed through transmission case body end cap and the first gear, and described transmission case body end cap and transmission case body are affixed, and two the 3rd gears of the first transmission device and the second transmission device are integrated by the axle that is in transmission connection is fixed.
Further, the first rocking arm and the second rocking arm are symmetrical structure setting, comprise respectively rocking arm casing, rocking arm end cap, rocking arm intermediate end cover, splined shaft and interconnective the 4th gear, one or more the 5th gear and the 6th gear.
Further, the 4th gear, the 5th gear and the 6th gear are arranged on rocking arm box house, and rocking arm end cap and rocking arm intermediate end cover are arranged on the outside of rocking arm casing.
Further, rocking arm connecting axle is fixed through rocking arm end cap and the 4th gear, and rocking arm intermediate end cover and rocking arm casing are fixed, and splined shaft is through the 6th gear fixed with the 6th gear, and splined shaft two ends connect respectively a series cylinder.
Further, height-regulating device is used for adjusting rocking arm height, and each rocking arm is with a height-regulating device, and the first rocking arm connects the first height-regulating device, the second rocking arm connects the second height-regulating device; The first height-regulating device and the second height-regulating device are symmetrical structure setting, comprise respectively worm gear, supporting seat, thrust ball bearing and worm screw.Adopt worm-and-wheel gear to heighten and can obtain very large gearratio, more compacter than crossed helical gears mechanism, it between two-wheeled mesh tooth face, is line contact, its supporting capacity is much higher than crossed helical gears mechanism and worm-drive is equivalent to worm drive, for multiple tooth engaged transmission, therefore stable drive, noise are very little.In the time that the lead angle of worm screw is less than the equivalent friction angle of meshing wheel between cog, mechanism has self-locking performance, can realize reverse self-locking, can only drive worm gear by worm screw, and can not drive worm screw by worm gear, can play safeguard protection effect.
Further, the rocking arm intermediate end cover on one end of worm gear and rocking arm casing is fixed, and the other end is connected with transmission case body end cap revolute pair, supporting seat is cemented on transmission case body, worm screw is connected with supporting seat revolute pair, and thrust ball bearing is connected with worm screw revolute pair, and worm gear is connected with worm tooth wheel set.
Further, on described worm screw, with guiding mechanism, by guiding mechanism rotary worm, drive the worm gear transmission case body end cap that unrolls to rotate, worm gear drives rocking arm casing rocking arm intermediate end cover to swing up or down.
Further, motor connects and drives the axle that is in transmission connection to rotate.Motor connects and drives the axle that is in transmission connection to rotate, and then once drives the 3rd gear, the second gear and the first gear to rotate.The first gear further drives rocking arm connecting axle to rotate, and then drives successively the 4th gear, the 5th gear and the 6th gear in rocking arm casing to rotate, the 6th gear driven splined shaft, thus the cylinder that makes to be connected on splined shaft rotates, and carries out coal work.
Compared with prior art, the following beneficial effect of both arms four flitting provided by the present invention:
1, the present invention have that coal mining area is large, coal mining efficiency is high, it is highly adjustable to mine, the feature of strong adaptability and energy-conserving and environment-protective.
2, the present invention has four cylinders, has greatly increased coal mining area, and can change according to actual needs the size of cylinder.
3, the present invention adopts worm gear device to regulate the height of mining, energy-conserving and environment-protective.Coal-winning machine can be according to actual landform, regulates wiggly coal mining height, has strengthened the compliance of coal-winning machine.
4, the present invention also can adopt other height-regulating device according to actual needs, as hydraulic pressure height-regulating device, improves the automatization level of coal-winning machine.
Brief description of the drawings
Fig. 1 is embodiment of the present invention structural representation;
Fig. 2 is embodiment of the present invention working effect figure;
Fig. 3 is that embodiment of the present invention rocking arm is heightened design sketch;
Fig. 4 is embodiment of the present invention front view;
Fig. 5 is running part internal construction schematic diagram in the embodiment of the present invention;
Fig. 6 is rocking arm internal construction schematic diagram in the embodiment of the present invention;
Fig. 7 is embodiment of the present invention height-regulating device schematic diagram;
Fig. 8 is embodiment of the present invention transmission case body end cap schematic diagram;
Fig. 9 is embodiment of the present invention worm gear schematic diagram;
Figure 10 is embodiment of the present invention rocking arm intermediate end cover schematic diagram.
Wherein: 1-half-edge coal seam;
2-running part, 2a-the first transmission device, 2b-the second transmission device, 21-the first gear, 22-transmission case body end cap, 23-rocking arm connecting axle, 24-the second gear, 25-the 3rd gear, 26-be in transmission connection axle, 27-transmission case body;
3a-the first rocking arm, 3b-the second rocking arm, 31-rocking arm casing, 32-rocking arm end cap, 33-rocking arm intermediate end cover, 34-splined shaft, 35-the 4th gear, 36-the 5th gear, 37-the 6th gear;
4a-the first height-regulating device, 4b-the second height-regulating device, 41-worm gear, 42-supporting seat, 43-thrust ball bearing, 44-worm screw;
5a-first roll left cylinder, 5b-second roll left cylinder, the right cylinder of 6a-first, the right cylinder of 6b-second;
7-tractive unit, 8-motor.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is further described.
A kind of both arms four flittings, comprise tractive unit 7, motor 8, and running part 2, rocking arm and height-regulating device; Motor 8 connection for transmission parts 2, and provide power for both arms four flittings; Running part 2 connects two rocking arms, i.e. the first rocking arm 3a and the second rocking arm 3b, and each rocking arm connects respectively two series cylinders; Described tractive unit 7 connects pulling equipment, drives whole both arms four flitting motions.
Described running part 2 comprises the axle 26 that is in transmission connection of transmission case body 27 and transmission case body 27 inside, and symmetrically arranged the first transmission device 2a and the second transmission device 2b, the first transmission device 2a and the second transmission device 2b comprise respectively interconnective first gear 21, the second gear 24 and the 3rd gear 25, wherein, the 3rd gear 25 connection for transmission connecting axle 26, the first gear 21 connecting rocker arm connecting axles 23.
The first gear 21 outsides are with transmission case body end cap 22; rocking arm connecting axle 23 is affixed through transmission case body end cap 22 and the first gear 21; described transmission case body end cap 22 and transmission case body 27 are affixed, and by being in transmission connection, axle 26 is fixed is integrated for two the 3rd gears 25 of the first transmission device 2a and the second transmission device 2b.
The first rocking arm 3a and the second rocking arm 3b are symmetrical structure setting, comprise respectively rocking arm casing 31, rocking arm end cap 32, rocking arm intermediate end cover 33, splined shaft 34 and interconnective one the 4th gear 35, the 5th gear 36 and the 6th gear 37.Rocking arm can change the length of rocking arm casing and the progression of internal gear transmission thereof according to actual needs.
The 4th gear 35, the 5th gear 36 and the 6th gear 37 are arranged on rocking arm casing 31 inside, and rocking arm end cap 32 and rocking arm intermediate end cover 33 are arranged on the outside of rocking arm casing 31.
Rocking arm connecting axle 23 is fixed through rocking arm end cap 32 and the 4th gear 35, and rocking arm intermediate end cover 33 is fixed with rocking arm casing 31, and splined shaft 34 is through the 6th gear 37 fixed with the 6th gear 37, and splined shaft 34 two ends connect respectively a series cylinder.The first rocking arm 3a connects the first roll left a 5a and the first right cylinder 6a, and the second rocking arm 3b connects the second roll left a 5b and the second right cylinder 6b.Cylinder can be changed different sizes according to actual needs.
The present invention is as a kind of both arms four flittings that are applicable to half-edge coal seam, and its operating principle is, under the effect of motor 8 drivings and tractive unit 7, by running part 2, height-regulating device, rocking arm and cylinder, to realize the high-efficiency mining of half-edge coal seam 1.Motor 8 connects and drives the axle 26 that is in transmission connection to rotate, and then once drives the 3rd gear 25, the second gear 24 and the first gear 21 to rotate.The first gear 21 further drives rocking arm connecting axle 23 to rotate, and then drive successively the 4th gear 35, the 5th gear 36 and the 6th gear 37 in rocking arm casing 31 to rotate, the 6th gear 37 drives splined shaft 34, thereby the cylinder that makes to be connected on splined shaft 34 rotates, and carries out coal work.
Height-regulating device is used for adjusting rocking arm height, and each rocking arm is with a height-regulating device, and the first rocking arm 3a connects the first height-regulating device 4a, the second rocking arm 3b connects the second height-regulating device 4b; The first height-regulating device 4a and the second height-regulating device 4b are symmetrical structure setting, comprise respectively worm gear 41, supporting seat 42, thrust ball bearing 43 and worm screw 44.
Rocking arm intermediate end cover 33 on one end of worm gear 41 and rocking arm casing 31 is fixed, the other end is connected with transmission case body end cap 22 revolute pairs, supporting seat 42 is cemented on transmission case body 27, worm screw 44 is connected with supporting seat 42 revolute pairs, thrust ball bearing 43 is connected with worm screw 44 revolute pairs, and worm gear 41 is connected with worm screw 44 gear pairs.
On described worm screw 44 with guiding mechanism, in the present embodiment, be set to six prism structures, by spanner rotation regulating mechanism, make worm screw 44, drive the worm gear 41 transmission case body end cap 22 that unrolls to rotate, worm gear 41 drives rocking arm casing rocking arm intermediate end cover 33 to swing up or down.
The present invention has that coal mining area is large, coal mining efficiency is high, it is highly adjustable to mine, the feature of strong adaptability and energy-conserving and environment-protective.Coal-winning machine has four cylinders, has greatly increased coal mining area, and can change according to actual needs the size of cylinder.Adopt worm gear device to regulate the height of mining, energy-conserving and environment-protective.Coal-winning machine can be according to actual landform, regulates wiggly coal mining height, has strengthened the compliance of coal-winning machine.
The present invention also can change power into other form (as diesel engine), add at power source place a controlling party to wheel, this drive mechanism and drum segment can repack into ploughs the machine of native use.
The present invention also can adopt other height-regulating device according to actual needs, as hydraulic pressure height-regulating device, improves the automatization level of coal-winning machine.
Above both arms four flittings provided by the present invention are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. both arms four flittings, comprise tractive unit (7), motor (8), and running part (2), rocking arm and height-regulating device; It is characterized in that, motor (8) connection for transmission part (2), and provide power for both arms four flittings; Running part (2) connects two rocking arms, i.e. the first rocking arm (3a) and the second rocking arm (3b), and each rocking arm connects respectively two series cylinders; Described tractive unit (7) connects pulling equipment, drives whole both arms four flitting motions.
2. both arms four flittings according to claim 1, it is characterized in that, described running part (2) comprises transmission case body (27) and the inner axle that is in transmission connection (26) of transmission case body (27), and symmetrically arranged the first transmission device (2a) and the second transmission device (2b), the first transmission device (2a) and the second transmission device (2b) comprise respectively interconnective first gear (21), one or more the second gears (24) and the 3rd gear (25), wherein, the 3rd gear (25) connection for transmission connecting axle (26), the first gear (21) connecting rocker arm connecting axle (23).
3. both arms four flittings according to claim 2, it is characterized in that, the first gear (21) outside is with transmission case body end cap (22); rocking arm connecting axle (23) is affixed through transmission case body end cap (22) and the first gear (21); described transmission case body end cap (22) is affixed with transmission case body (27), and two the 3rd gears (25) of the first transmission device (2a) and the second transmission device (2b) are by fixed being integrated of the axle that is in transmission connection (26).
4. both arms four flittings according to claim 2, it is characterized in that, the first rocking arm (3a) and the second rocking arm (3b) are symmetrical structure setting, comprise respectively rocking arm casing (31), rocking arm end cap (32), rocking arm intermediate end cover (33), splined shaft (34) and interconnective the 4th gear (35), one or more the 5th gear (36) and the 6th gear (37).
5. both arms four flittings according to claim 4, it is characterized in that, the 4th gear (35), the 5th gear (36) and the 6th gear (37) are arranged on rocking arm casing (31) inside, and rocking arm end cap (32) and rocking arm intermediate end cover (33) are arranged on the outside of rocking arm casing (31).
6. according to both arms four flittings described in claim 4 or 5, it is characterized in that; rocking arm connecting axle (23) is fixed through rocking arm end cap (32) and the 4th gear (35); rocking arm intermediate end cover (33) is fixed with rocking arm casing (31); splined shaft (34) is through the 6th gear (37) fixed with the 6th gear (37), and splined shaft (34) two ends connect respectively a series cylinder.
7. both arms four flittings according to claim 4, it is characterized in that, height-regulating device is used for adjusting rocking arm height, each rocking arm is with a height-regulating device, and the first rocking arm (3a) connects the first height-regulating device (4a), the second rocking arm (3b) connects the second height-regulating device (4b); The first height-regulating device (4a) and the second height-regulating device (4b) are symmetrical structure setting, comprise respectively worm gear (41), supporting seat (42), thrust ball bearing (43) and worm screw (44).
8. both arms four flittings according to claim 7, it is characterized in that, rocking arm intermediate end cover (33) on one end of worm gear (41) and rocking arm casing (31) is fixed, the other end is connected with transmission case body end cap (22) revolute pair, supporting seat (42) is cemented on transmission case body (27), worm screw (44) is connected with supporting seat (42) revolute pair, thrust ball bearing (43) is connected with worm screw (44) revolute pair, and worm gear (41) is connected with worm screw (44) gear pair.
9. according to both arms four flittings described in claim 7 or 8, it is characterized in that, described worm screw (44) is upper with guiding mechanism, by guiding mechanism rotary worm (44), drive worm gear (41) unroll transmission case body end cap (22) rotate, worm gear (41) drive rocking arm casing rocking arm intermediate end cover (33) swing up or down.
10. both arms four flittings according to claim 2, is characterized in that, motor (8) connects and drives the axle that is in transmission connection (26) to rotate.
CN201410192477.4A 2014-05-05 2014-05-05 Two-arm and four-roller coal mining machine Pending CN103924970A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410192477.4A CN103924970A (en) 2014-05-05 2014-05-05 Two-arm and four-roller coal mining machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410192477.4A CN103924970A (en) 2014-05-05 2014-05-05 Two-arm and four-roller coal mining machine

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Publication Number Publication Date
CN103924970A true CN103924970A (en) 2014-07-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105257291A (en) * 2015-11-02 2016-01-20 王洁 Steep coal-seam coal mining and transportation apparatus and coal mining and transportation method
WO2016055384A1 (en) * 2014-10-06 2016-04-14 Sandvik Intellectual Property Ab Cutting apparatus
CN113738355A (en) * 2021-09-06 2021-12-03 中国矿业大学 Thin coal seam mining robot

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101144381A (en) * 2006-09-11 2008-03-19 天地上海采掘装备科技有限公司 Very thin seam coal winning machine with particular arranged motor
CN202031587U (en) * 2011-04-14 2011-11-09 西安康瑞矿用设备有限公司 Rocker arm of double cutting motors of coal mining machine
CN202187761U (en) * 2011-07-16 2012-04-11 西安煤矿机械有限公司 High-power heavy type low seam mining machine
WO2012156884A2 (en) * 2011-05-16 2012-11-22 Caterpillar Global Mining Europe Gmbh Mining installation for extracting seam-type or mass-deposit mineral materials, and mining machine for the same
CN102979521A (en) * 2012-12-19 2013-03-20 湖南科技大学 Rocker-type transverse shearer
CN202926325U (en) * 2012-11-10 2013-05-08 山东先河悦新机电股份有限公司 Alternative-current traction coal mining machine of thin coal seam

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101144381A (en) * 2006-09-11 2008-03-19 天地上海采掘装备科技有限公司 Very thin seam coal winning machine with particular arranged motor
CN202031587U (en) * 2011-04-14 2011-11-09 西安康瑞矿用设备有限公司 Rocker arm of double cutting motors of coal mining machine
WO2012156884A2 (en) * 2011-05-16 2012-11-22 Caterpillar Global Mining Europe Gmbh Mining installation for extracting seam-type or mass-deposit mineral materials, and mining machine for the same
CN202187761U (en) * 2011-07-16 2012-04-11 西安煤矿机械有限公司 High-power heavy type low seam mining machine
CN202926325U (en) * 2012-11-10 2013-05-08 山东先河悦新机电股份有限公司 Alternative-current traction coal mining machine of thin coal seam
CN102979521A (en) * 2012-12-19 2013-03-20 湖南科技大学 Rocker-type transverse shearer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016055384A1 (en) * 2014-10-06 2016-04-14 Sandvik Intellectual Property Ab Cutting apparatus
CN106795759A (en) * 2014-10-06 2017-05-31 山特维克知识产权股份有限公司 Cutting equipment
US10208596B2 (en) 2014-10-06 2019-02-19 Sandvik Intellectual Property Ab Cutting apparatus
CN106795759B (en) * 2014-10-06 2019-06-14 山特维克知识产权股份有限公司 Cutting equipment
AU2015330131B2 (en) * 2014-10-06 2020-06-11 Sandvik Intellectual Property Ab Cutting apparatus
CN105257291A (en) * 2015-11-02 2016-01-20 王洁 Steep coal-seam coal mining and transportation apparatus and coal mining and transportation method
CN113738355A (en) * 2021-09-06 2021-12-03 中国矿业大学 Thin coal seam mining robot
CN113738355B (en) * 2021-09-06 2022-08-05 国科中迈(徐州)能源科技有限公司 Thin coal seam mining robot

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Application publication date: 20140716