CN104763418A - Grooving machine - Google Patents
Grooving machine Download PDFInfo
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- CN104763418A CN104763418A CN201510151655.3A CN201510151655A CN104763418A CN 104763418 A CN104763418 A CN 104763418A CN 201510151655 A CN201510151655 A CN 201510151655A CN 104763418 A CN104763418 A CN 104763418A
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- working arm
- oil cylinder
- groover
- mounting platform
- cutting
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- 230000007246 mechanism Effects 0.000 claims abstract description 101
- 238000005520 cutting process Methods 0.000 claims abstract description 31
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims abstract description 8
- 230000008520 organization Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 210000000481 breast Anatomy 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 32
- 239000003245 coal Substances 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 238000004880 explosion Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- -1 reversal valve Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a grooving machine, which comprises a self-walking mechanism, a working arm rotating mechanism, a working arm mechanism, a cutting mechanism, and a power and control mechanism, wherein the self-walking mechanism is arranged at the bottom of the grooving machine; a mounting platform is arranged at the upper part of the self-walking mechanism; the working arm rotating mechanism and the power and control mechanism are arranged on the mounting platform; the working arm rotating mechanism comprises a turbo-worm reducer and a working arm mounting holder connected with an output shaft of the turbo-worm reducer; the turbo-worm reducer is fixed on the mounting platform; the working arm mechanism is rotatably connected onto the working arm mounting holder and is connected with the cutting mechanism; the power and control mechanism is connected with and controls actions of the self-walking mechanism, the working arm mechanism, the working arm rotating mechanism and the cutting mechanism. A grooving working arm can rotate freely for 360 degrees; the stability coefficient of the grooving machine can be increased through an expendable stabilizing support leg mechanism; the mechanical grooving operation is realized; the grooving efficiency is improved; the labor intensity is alleviated and the safety coefficient is increased.
Description
Technical field
The present invention relates to underground coal mine connection roadway grooving techniques field, particularly relate to a kind of all-hydraulic connection roadway groover.
Background technology
Along with the development of coal industry science and technology and the requirement of CHINESE INDUSTRIES policy, from last century the eighties, advanced bolting and rope support technology is widely applied in the coal mine roadway driving of China.Widely using of the heading equipment such as fully-mechanized digging machine, Lian Caiji makes driving face achieve mechanization coal breakage and coaling, and thus considerably increases driving speed.The use of novel anchor rod anchor cable drill carriage makes support speed substantially can catch up with driving speed.Along with the lifting of digging laneway speed, connection roadway needs the quantity of fluting also to increase.
The fluting operation of current underground coal mine connection roadway mainly relies on manually to have come, and its mechanization degree is extremely low, and labour intensity is large, and speed of application is slow, inefficiency.Workman carries out slotting work, work under bad environment when not screening, and there is great potential safety hazard.
Therefore found a kind of all-hydraulic connection roadway groover that can realize fluting mechanization of operation, become the target that current industry needs to improve.
Summary of the invention
The technical problem to be solved in the present invention is to provide the groover that a kind of structure is simple, operating efficiency is high, achieve fluting mechanization of operation, automation, thus overcoming existing artificial construction's operation, to there is employment many, labour intensity is large, work under bad environment, speed of application is slow, efficiency is low, the deficiency of poor stability.
For solving the problems of the technologies described above, the invention provides a kind of groover, comprising automatic walking mechanism, working arm rotating mechanism, working arm mechanism, cutting mechanism, power and controlling organization,
Described automatic walking mechanism is positioned at the bottom of groover, and its top is provided with mounting platform, installation work arm rotating mechanism, power and controlling organization on described mounting platform;
The working arm mount pad that described working arm rotating mechanism comprises turbine worm reducer and is connected with its output shaft, described turbine worm reducer is fixed on mounting platform;
Described working arm mechanism is rotating to be connected on working arm mount pad, and is connected with cutting mechanism;
Described power and controlling organization connect and control automatic walking mechanism, working arm mechanism, working arm rotating mechanism and cutting mechanism action.
As a modification of the present invention, described groover also comprises stable car support leg mechanism, and described stable car support leg mechanism is fixedly mounted on mounting platform.
Further improvement, described stable car support leg mechanism comprises two groups of horizontal telescopic devices, described two groups of horizontal telescopic devices are arranged at the front and rear of mounting platform respectively, and it is flexible to the mounting platform left and right sides, described horizontal telescopic device of often organizing includes two parallel and extension sleeves that telescopic direction is contrary, and the external part of described each extension sleeve all connects a backplanes support oil cylinder.
Further improvement, the external part of described each extension sleeve also connects a top plate supporting oil cylinder.
Further improvement, described top plate supporting oil cylinder is two-stage telescopic cylinder, and described backplanes support oil cylinder is one-level telescopic oil cylinder.
Further improvement, described working arm mechanism comprises working arm extension sleeve, oscillating oil cylinder and working arm telescopic oil cylinder, the outer sleeve of described working arm extension sleeve is rotating to be connected on working arm mount pad, the external part of its inner sleeve is connected with cutting mechanism, the two ends of described working arm telescopic oil cylinder connect the inside and outside sleeve of working arm extension sleeve respectively, and the two ends of described oscillating oil cylinder connect working arm outer sleeve and working arm mount pad respectively.
Further improvement, described cutting mechanism is drum-type bit.
Further improvement, described drum-type bit comprises cutting roll, hydraulic motor and connected reductor, and described cutting roll is connected with reductor, under the effect of hydraulic motor, makes reductor drive cutting roll to rotate by gear drive.
Further improvement, described drum-type bit comprises two hydraulic motors and connected two reductors of difference, and described two hydraulic motors are arranged on the bosom of cutting roll, and described two reductors are arranged on the both sides, inside of cutting roll.
Further improvement, described automatic walking mechanism is crawler type walking mechanism or rubber wheel type walking mechanism, and interlock valve is housed.
Adopt above-mentioned technical scheme, the present invention at least has the following advantages:
1, groover of the present invention can realize mechanization of operation of slotting, and improves fluting efficiency, improves the safety factor of fluting operation, reduces labour intensity.
2, groover of the present invention is by arranging the stable car leg structure of energy horizontal development, adds the coefficient of stability of this groover, and by arranging top plate supporting oil cylinder, more ensure that the stability of car load during fluting operation.
3, the bit of groover of the present invention is drum-type bit, and directly driven by gear drive by low-speed big torque motor, reliable transmission, mechanical efficiency is high; Adopt the flexible single armed of band to complete fluting work, structure is reliable, simple to operate.
4, working arm rotating mechanism of the present invention can drive working arm to realize 360 ° to rotate freely.
5, the all-hydraulic control of groover of the present invention, power section is that anti-explosion diesel engine for mine drives variable delivery hydraulic oil pump to be system feed flow.The hydraulic valve bank controlling working arm and bit action adopts advanced electromagnetic valve group to control, and accurately can locate and carry out fluting operation.Its electrical system has explosion prevention function, ensures the personal safety of operating personnel.And operator can stand in the place of safety, broad view, realized the action of fluting work by the action of remote controller Controlling solenoid valve group.
6, groover integrated model of the present invention is reasonable, good rigidly, and walking is freely reliable, adapts to work under rugged environment.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail.
Fig. 1 is the structural representation of the contraction state of groover of the present invention;
Fig. 2 is the structural representation of working arm in the present invention;
Fig. 3 is the structural representation of bit mechanism in the present invention;
Fig. 4 is the structural representation of stable car support leg mechanism in the present invention;
Fig. 5 is the structural representation of groover deployed condition of the present invention.
Detailed description of the invention
Groover of the present invention can realize one-time positioning in underground coal mine connection roadway and can complete two and help and top channel cutting operation, realizes the mechanization of fluting operation, reduces labor intensity, and reduces operating personnel, improves fluting operating efficiency and job safety coefficient.Certainly, the present embodiment is applied to the fluting operation of underground coal mine connection roadway for this groover, can not be interpreted as any restriction to groover of the present invention.
With reference to shown in accompanying drawing 1, a kind of connection roadway groover of the present invention, comprises automatic walking mechanism 5, mounting platform 4, working arm rotating mechanism 3, working arm mechanism 2, cutting mechanism 1, stable car support leg mechanism 7, pump station part 6, electrical system and hydraulic system.
Automatic walking mechanism 5 is positioned at the bottom of groover, and be preferably crawler type walking mechanism, its inside is provided with tensioner spring and running motor, and this running motor provides the power of automatic walking mechanism 5, drives automatic walking mechanism 5 to move forward and backward.Automatic walking mechanism 5 is also equipped with interlock valve, presses interlock valve when groover stops, and groover can not move, and can carry out the swing of working arm, rotation, stretch, the rotation of bit, the actions such as the support of supporting leg; Remove the interlock valve of automatic walking mechanism 5, running motor drives reductor, drives crawler belt to realize the walking of automatic walking mechanism 5 by sprocket wheel.Automatic walking mechanism 5 can be also rubber wheel type walking mechanism, and it comprises steering mechanism and running motor, makes it can the moving in coal mine roadway of freedom of movement.
Automatic walking mechanism 5 top is provided with mounting platform 4, and mounting platform 4 is connected with automatic walking mechanism 5 with bolt by the bindiny mechanism of automatic walking mechanism 5, it is provided with working arm rotating mechanism 3, stable car support leg mechanism 7, pump station part 6, electric and hydraulic system.
With reference to shown in accompanying drawing 2, working arm rotating mechanism 3 comprises turbine worm reducer 21 and working arm mount pad 22.Working arm mount pad 22 is mounted by means of bolts on the output shaft of turbine worm reducer 21, and turbine worm reducer 21 is mounted by means of bolts on mounting platform 4.Turbine worm reducer 21 carries hydraulic motor, and under the drive of hydraulic motor, working arm mount pad 22 can realize 360 ° and rotate freely.
Working arm mechanism 2 comprises working arm extension sleeve, swings up and down oil cylinder 23 and working arm telescopic oil cylinder 26.Working arm extension sleeve comprises working arm inner sleeve 25 and working arm outer sleeve 24, and working arm outer sleeve 24 is rotating to be connected on working arm mount pad 22.Working arm telescopic oil cylinder 26 is positioned at working arm inner sleeve 25, and its two ends are respectively by hinge working arm inner sleeve 25 and working arm outer sleeve 24.Swing up and down the side that oil cylinder 23 is positioned at working arm outer sleeve 24, its two ends are respectively by hinge working arm outer sleeve 24 and working arm mount pad 22.By control to swing up and down oil cylinder 23 and working arm telescopic oil cylinder 26 flexible realize working arm swing up and down and flexible.Certainly, this working arm mechanism 2 can comprise two and swing up and down oil cylinder 23, and these two swing up and down the both sides that oil cylinder 23 lays respectively at working arm outer sleeve 24, make swinging up and down of working arm more reliable and more stable.
With reference to shown in accompanying drawing 3, cutting mechanism 1 is drum-type bit preferably, and drum-type bit is fixedly connected with the inner sleeve 25 of working arm mechanism by bolt.Bit is by two, left and right low-speed big torque motor 13 as power source, and hydraulic motor 13 is connected with reductor 11 by splined shaft, and cutting roll 12 and reductor 11 are bolted to connection; Hydraulic motor 13 directly drives cutting roll 12 to carry out rotary cutting, reliable transmission by the gear drive of reductor 11, and mechanical efficiency is high.
With reference to shown in accompanying drawing 4, stable car support leg mechanism 7 comprises two groups of horizontal telescopic devices and eight support cylinders.Two groups of horizontal telescopic devices are arranged at the front and rear of mounting platform 4 respectively, and stretch respectively to the both sides of mounting platform 4, often organize horizontal telescopic device and include two parallel and extension sleeves that telescopic direction is contrary, the horizontal telescoping oil cylinder 72 that each extension sleeve includes horizontal inner sleeve 71, horizontal outer sleeve 73 and is hinged between horizontal inner sleeve 71 and horizontal outer sleeve 73.The external part of each horizontal inner sleeve 71 is all bolted to connection a top plate supporting oil cylinder 74 and a backplanes support oil cylinder 75.Wherein, top plate supporting oil cylinder 74 is two-stage telescopic cylinder, and backplanes support oil cylinder 75 is one-level telescopic oil cylinder.So this groover has four top plate supporting oil cylinders 74 and four foundation plate support cylinders 75 altogether, ensure the stability of car load during fluting operation.When this structure makes groover work, the horizontal inner sleeve 71 of horizontal telescoping oil cylinder 72 drive stretches out, and the supporting leg of top plate supporting oil cylinder 74 and backplanes support oil cylinder 75 stretches out, and roof supporting and base plate, play stable car effect respectively; When groover walking is mobile, stable car support leg mechanism 7 can be regained and embed in vehicle body.
Pump station part 6 comprises hydraulic oil pump, anti-explosion diesel engine for mine, pressure meter and guard shield composition, and hydraulic oil pump is connected by shaft coupling with anti-explosion diesel engine for mine, and pressure meter is connected with hydraulic oil pump by fluid pressure line.
Hydraulic system is whole car " grain ", include fuel tank, reversal valve, oil pipe seat, joint, fluid pressure line, water pipe and cooler etc., fuel tank is on mounting platform, and the executing agency that fluid pressure line completes corresponding actions with automatic walking mechanism 5, working arm rotating mechanism 3, working arm mechanism 2, cutting mechanism 1 is respectively connected.
Electrical system forms primarily of mine anti-explosion ammeter, the light-duty rubber-sheathed flexible cable in colliery, anti-explosion terminal box, reverse alarming instrument, mining voice light optical signal device, essential safe type starter, mining illuminating lamp and intrinsically safe wireless remote controller.The position that Digiplex adjustment controls working arm makes chip head accurately can locate the work of chip fluting, simple to operate, safety.
Above-mentioned pump station part 6, electrical system and hydraulic system form power and the controlling organization of this groover jointly, are all-hydraulic control.Electrical system connects and controls pump station part, pump station part again by the fluid pressure line of hydraulic system power transmission to each executing agency, then complete the actions such as walking, support, fluting by operating valve corresponding on fluid pressure line.
With reference to shown in accompanying drawing 5, the course of work of connection roadway groover of the present invention is: first groover reaches intermediate demand fluting place, tunnel and stops, and pin interlock valve, automatic walking mechanism 5 can not move.Then the horizontal inner sleeve 71 of horizontal telescoping oil cylinder 72 drive stretches out, and the supporting leg of top plate supporting oil cylinder 74 and backplanes support oil cylinder 75 stretches out, and roof supporting and base plate, play stable car effect respectively.Operating personnel complete grooving process by control working arm mechanism 2 and cutting mechanism 1, after groover completes the fluting work in tunnel, side, 180 degree of rotations of revolving bed are completed by controlling working arm rotating mechanism 3, continued the fluting work in opposite side tunnel, final one-time positioning just can complete the excavation work of both sides, tunnel and top board groove.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (10)
1. a groover, is characterized in that, comprises automatic walking mechanism, working arm rotating mechanism, working arm mechanism, cutting mechanism, power and controlling organization,
Described automatic walking mechanism is positioned at the bottom of groover, and its top is provided with mounting platform, installation work arm rotating mechanism, power and controlling organization on described mounting platform;
The working arm mount pad that described working arm rotating mechanism comprises turbine worm reducer and is connected with its output shaft, described turbine worm reducer is fixed on mounting platform;
Described working arm mechanism is rotating to be connected on working arm mount pad, and is connected with cutting mechanism;
Described power and controlling organization connect and control automatic walking mechanism, working arm mechanism, working arm rotating mechanism and cutting mechanism action.
2. groover according to claim 1, is characterized in that, described groover also comprises stable car support leg mechanism, and described stable car support leg mechanism is fixedly mounted on mounting platform.
3. groover according to claim 2, it is characterized in that, described stable car support leg mechanism comprises two groups of horizontal telescopic devices, described two groups of horizontal telescopic devices are arranged at the front and rear of mounting platform respectively, and it is flexible to the mounting platform left and right sides, described horizontal telescopic device of often organizing includes two parallel and extension sleeves that telescopic direction is contrary, and the external part of described each extension sleeve all connects a backplanes support oil cylinder.
4. groover according to claim 3, is characterized in that, the external part of described each extension sleeve also connects a top plate supporting oil cylinder.
5. groover according to claim 4, is characterized in that, described top plate supporting oil cylinder is two-stage telescopic cylinder, and described backplanes support oil cylinder is one-level telescopic oil cylinder.
6. groover according to claim 1, it is characterized in that, described working arm mechanism comprises working arm extension sleeve, oscillating oil cylinder and working arm telescopic oil cylinder, the outer sleeve of described working arm extension sleeve is rotating to be connected on working arm mount pad, the external part of its inner sleeve is connected with cutting mechanism, the two ends of described working arm telescopic oil cylinder connect the inside and outside sleeve of working arm extension sleeve respectively, and the two ends of described oscillating oil cylinder connect working arm outer sleeve and working arm mount pad respectively.
7. groover according to claim 1, is characterized in that, described cutting mechanism is drum-type bit.
8. groover according to claim 7, it is characterized in that, described drum-type bit comprises cutting roll, hydraulic motor and connected reductor, and described cutting roll is connected with reductor, under the effect of hydraulic motor, reductor is made to drive cutting roll to rotate by gear drive.
9. groover according to claim 8, it is characterized in that, described drum-type bit comprises two hydraulic motors and connected two reductors of difference, and described two hydraulic motors are arranged on the bosom of cutting roll, and described two reductors are arranged on the both sides, inside of cutting roll.
10. groover according to claim 1, is characterized in that, described automatic walking mechanism is crawler type walking mechanism or rubber wheel type walking mechanism, and interlock valve is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510151655.3A CN104763418A (en) | 2015-04-01 | 2015-04-01 | Grooving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510151655.3A CN104763418A (en) | 2015-04-01 | 2015-04-01 | Grooving machine |
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| CN104763418A true CN104763418A (en) | 2015-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510151655.3A Pending CN104763418A (en) | 2015-04-01 | 2015-04-01 | Grooving machine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673009A (en) * | 2016-04-21 | 2016-06-15 | 辽宁工程技术大学 | Pushing type chain-driving thin seam mining device and using method thereof |
| CN106368696A (en) * | 2016-09-21 | 2017-02-01 | 徐州和润起重设备技术有限公司 | Slotting working equipment used for underground coal mine and using method thereof |
| CN106891444A (en) * | 2017-03-09 | 2017-06-27 | 中国石油天然气集团公司 | A kind of rock cutting device |
| CN108071393A (en) * | 2018-02-02 | 2018-05-25 | 成都市猎石者破岩科技有限责任公司 | Mining method is broken in the rock stratum of a kind of ditching device and application ditching device |
| CN110439553A (en) * | 2019-08-30 | 2019-11-12 | 张有权 | A kind of underground coal mine groover |
| CN110876285A (en) * | 2019-12-17 | 2020-03-13 | 邵志远 | Cutting type terrace flattening machine |
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| WO2010050872A1 (en) * | 2008-10-31 | 2010-05-06 | Atlas Copco Rock Drills Ab | Method and device for working rock |
| DE102011014912A1 (en) * | 2011-03-24 | 2012-09-27 | Thomas Tafel | Machining device for creating mining cavities in mine, has continuous conveyer movably guided at mining system, where multiple hydraulically driven rotary percussive cutting equipments are provided in device |
| CN102839975A (en) * | 2011-06-23 | 2012-12-26 | 三一重型装备有限公司 | Hardrock tunneling machine |
| CN202832527U (en) * | 2012-10-16 | 2013-03-27 | 中国煤炭进出口公司 | Cutting device for coal mining equipment |
| CN204040917U (en) * | 2014-05-28 | 2014-12-24 | 徐州重型机械有限公司 | A kind of chassis of trepan, trepan |
| CN204677200U (en) * | 2015-04-01 | 2015-09-30 | 蒲长晏 | A kind of groover |
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2015
- 2015-04-01 CN CN201510151655.3A patent/CN104763418A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010050872A1 (en) * | 2008-10-31 | 2010-05-06 | Atlas Copco Rock Drills Ab | Method and device for working rock |
| DE102011014912A1 (en) * | 2011-03-24 | 2012-09-27 | Thomas Tafel | Machining device for creating mining cavities in mine, has continuous conveyer movably guided at mining system, where multiple hydraulically driven rotary percussive cutting equipments are provided in device |
| CN102839975A (en) * | 2011-06-23 | 2012-12-26 | 三一重型装备有限公司 | Hardrock tunneling machine |
| CN202832527U (en) * | 2012-10-16 | 2013-03-27 | 中国煤炭进出口公司 | Cutting device for coal mining equipment |
| CN204040917U (en) * | 2014-05-28 | 2014-12-24 | 徐州重型机械有限公司 | A kind of chassis of trepan, trepan |
| CN204677200U (en) * | 2015-04-01 | 2015-09-30 | 蒲长晏 | A kind of groover |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673009A (en) * | 2016-04-21 | 2016-06-15 | 辽宁工程技术大学 | Pushing type chain-driving thin seam mining device and using method thereof |
| CN106368696A (en) * | 2016-09-21 | 2017-02-01 | 徐州和润起重设备技术有限公司 | Slotting working equipment used for underground coal mine and using method thereof |
| CN106891444A (en) * | 2017-03-09 | 2017-06-27 | 中国石油天然气集团公司 | A kind of rock cutting device |
| CN106891444B (en) * | 2017-03-09 | 2019-04-02 | 中国石油天然气集团公司 | A kind of rock cutting device |
| CN108071393A (en) * | 2018-02-02 | 2018-05-25 | 成都市猎石者破岩科技有限责任公司 | Mining method is broken in the rock stratum of a kind of ditching device and application ditching device |
| CN110439553A (en) * | 2019-08-30 | 2019-11-12 | 张有权 | A kind of underground coal mine groover |
| CN110876285A (en) * | 2019-12-17 | 2020-03-13 | 邵志远 | Cutting type terrace flattening machine |
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Application publication date: 20150708 |