CN112124176B - Support carrier for coal mine - Google Patents
Support carrier for coal mine Download PDFInfo
- Publication number
- CN112124176B CN112124176B CN202011070230.7A CN202011070230A CN112124176B CN 112124176 B CN112124176 B CN 112124176B CN 202011070230 A CN202011070230 A CN 202011070230A CN 112124176 B CN112124176 B CN 112124176B
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- Prior art keywords
- telescopic
- lifting
- cylinder
- arm
- frame
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
- B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/06—Endless track vehicles with tracks without ground wheels
- B62D55/065—Multi-track vehicles, i.e. more than two tracks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
- B66C23/42—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a bracket carrier for a coal mine, which relates to the technical field of coal mine mechanical equipment and comprises a frame, wherein the frame is arranged at the upper end of a crawler travelling mechanism, a carrying mechanism is rotatably arranged at one side of the upper end of the frame, and a lifting shovel plate mechanism is arranged at the lower end of the frame; the handling mechanism comprises a telescopic mechanism and a clamping assembly, the telescopic mechanism comprises a lifting arm, a telescopic arm and a base, the base is rotatably arranged on the frame, the lifting arm and a first lifting oil cylinder are hinged to the base, the other end of the first lifting oil cylinder is hinged to the lifting arm, a telescopic oil cylinder is arranged in the lifting arm, the other end of the telescopic oil cylinder is arranged on the telescopic arm, and the end part of the telescopic arm is connected with the clamping assembly capable of swinging left and right through a connecting assembly. The telescopic mechanism has wide application range, and can be used for hoisting besides a carrying bracket; the invention is convenient to carry in a narrow tunnel, reduces manpower and working procedures, and greatly improves the carrying efficiency.
Description
Technical Field
The invention relates to the technical field of coal mine mechanical equipment, in particular to a bracket carrier for a coal mine.
Background
When the coal mine is fully mechanized coal mining, the support is required to reinforce and support the top plate, and due to the gradual backward movement of the coal mining machine during fully mechanized coal mining, the support is required to be paved and reinforced backwards along with the coal mining machine, so that underground personnel are protected, and the support is required to be continuously transported. Currently, for the transportation of the rack, a self-walking type mobile device is adopted, and the self-walking type mobile device needs to be paved with a track and needs to drag a long cable. When such a device is used for carrying a rack, the problem of long preparation time and low movement efficiency exists, and the problem of difficulty in carrying a relatively narrow roadway exists. Therefore, there is a need to design a rack truck that is efficient and convenient.
Disclosure of Invention
In view of the defects and shortcomings in the prior art, the invention provides the bracket carrier for the coal mine, which is simple in structure, and the carrier mechanism can stretch, rotate and adjust the angle of the bracket, so that the problems of long preparation time, low moving efficiency and difficulty in carrying in a narrow roadway in the prior art are solved.
In order to solve the technical problems, the invention adopts the following technical scheme: the bracket carrier for the coal mine comprises a frame, a crawler traveling mechanism, a shovel plate mechanism, a carrying mechanism, a power mechanism and a counterweight mechanism, wherein the frame is arranged at the upper end of the crawler traveling mechanism, the carrying mechanism is rotatably arranged at one side of the upper end of the frame, and the shovel plate mechanism capable of lifting is arranged at the lower end of the frame; the carrying mechanism comprises a telescopic mechanism and a clamping assembly, the telescopic mechanism comprises a lifting arm, a telescopic arm and a base, the base is rotatably arranged on the frame, the base is hinged with the lifting arm and a first lifting oil cylinder, the other end of the first lifting oil cylinder is hinged to the lifting arm, a telescopic oil cylinder is arranged in the lifting arm, the other end of the telescopic oil cylinder is arranged on the inner wall of the telescopic arm, the end part of the telescopic arm is connected with the clamping assembly through a connecting assembly, and the clamping assembly is connected to the connecting assembly which can swing up and down and left and right.
As a further improvement of the invention, the connecting component comprises a movable seat, the movable seat is L-shaped and rotates 90 degrees clockwise, the vertical section of the movable seat is fixed at the front end of the telescopic arm, the transverse section of the movable seat is arranged at the upper end of the telescopic arm, an amplitude cylinder is hinged in the transverse section of the movable seat, the other end of the amplitude cylinder and the vertical section of the movable seat are both hinged on a connecting piece, a spiral swing cylinder which is vertically arranged is arranged on the connecting piece, and the upper end and the lower end of the spiral swing cylinder are connected on the clamping component.
As a further improvement of the invention, the clamping assembly comprises a clamp holder and a clamping turning plate, the clamp holder is in a T shape rotating 90 degrees clockwise, the lower end of a vertical plate of the clamp holder is hinged with a clamping oil cylinder, the other end of the clamping oil cylinder is fixed on the clamping turning plate, and the lower end of the clamping turning plate is hinged with the outer end part of a horizontal plate of the clamp holder.
As a further improvement of the invention, the base is rotatably arranged on the frame through the rotary speed reducer, the inner ring of the rotary speed reducer is fixedly connected with the base, an upper hinge point and a lower hinge point are arranged on the base, the upper hinge point is hinged with the lifting arm, and the lower hinge point is hinged with the first lifting oil cylinder.
As a further improvement of the invention, the lifting arm and the telescopic arm are of a cavity structure, the lower end of the lifting arm is hinged with the other end of the first lifting oil cylinder, the telescopic oil cylinder is fixedly arranged in the lifting arm, and the other end of the telescopic oil cylinder is fixedly arranged in the telescopic arm.
As a further improvement of the invention, the shovel plate mechanism comprises a shovel plate and a second lifting oil cylinder, wherein the bottom end of the frame is provided with an installation seat, the second lifting oil cylinder and the shovel plate are respectively hinged at the upper end and the lower end of the installation seat, and the other end of the second lifting oil cylinder is hinged on the shovel plate.
As a further improvement of the invention, the other side of the upper end of the frame is provided with a power mechanism and a counterweight mechanism.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the clamped bracket is integrally rotated through the rotatable base, and the clamped bracket is lifted and lowered through the combined action of the lifting arm and the telescopic arm;
2. according to the invention, the position of the clamped bracket is adjusted through the spiral swing oil cylinder and the luffing oil cylinder capable of swinging up and down, and the direction of the bracket is converted through swinging left and right so as to adapt to the bracket and carry the bracket in a narrow roadway conveniently;
3. the roadway bottom plate is trimmed through the shovel plate mechanism, so that the crawler travelling mechanism is convenient to move, and a foundation is laid for improving the carrying efficiency;
4. the power mechanism is placed on the frame, so that the problem of back and forth dragging of cables is effectively avoided, meanwhile, the crawler tracks walk, no additional track is needed, and the carrying efficiency is further improved;
in general, the bracket carrier for the coal mine is convenient to carry in a narrow roadway, the carrying efficiency is greatly improved, and in addition, the telescopic mechanism is wide in application range and can be used for hoisting besides carrying the bracket.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of a clamping bracket according to the present invention;
FIG. 3 is a schematic view of a handling rack according to the present invention;
fig. 4 is a schematic view of a shovel board mechanism.
In the figure: 100. door bracket, frame, 2, crawler travel mechanism, 3, blade mechanism, 301, blade, 302, second lift cylinder, 303, mount, 4, base, 5, telescoping mechanism, 501, lift arm, 502, first lift cylinder, 503, telescoping arm, 6, slewing reducer, 7, spiral swing cylinder, 8, connecting component, 801, movable seat, 802, luffing cylinder, 803, connecting component, 9, clamping component, 901, clamp, 902, clamping flap, 903, clamping cylinder, 10, power mechanism, 11, counterweight mechanism.
It is noted that in the description of the present invention, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Detailed Description
In order that the manner in which the above-recited features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, it being understood that the invention is not limited thereto but is to be carried out by those skilled in the art in light of the appended drawings.
Referring to fig. 1-4, a bracket carrier for coal mine comprises a frame 1, wherein the frame 1 is arranged at the upper end of a crawler travelling mechanism 2, a carrying mechanism is rotatably arranged at one side of the upper end of the frame 1, and a lifting shovel plate mechanism 3 is arranged at the lower end of the frame 1; the carrying mechanism comprises a telescopic mechanism 5 and a clamping assembly 9, the telescopic mechanism 5 comprises a lifting arm 501, a telescopic arm 503 and a base 4, the base 4 is rotatably arranged on the frame 1, the lifting arm 501 and a first lifting oil cylinder 502 are hinged on the base 4, the other end of the first lifting oil cylinder 502 is hinged on the lifting arm 501, a telescopic oil cylinder (the telescopic oil cylinder is arranged inside the telescopic arm and is also common knowledge of a person skilled in the art, and is not indicated in the figure) is arranged in the lifting arm 501, the other end of the telescopic oil cylinder is arranged on the inner wall of the telescopic arm 503, the end part of the telescopic arm 503 is connected with the clamping assembly 9 through a connecting assembly 8, and the clamping assembly can swing up and down and swing left and right and is connected to the connecting assembly; the other side of the upper end of the frame 1 is provided with a power mechanism 10 and a counterweight mechanism 11.
The connecting assembly 8 comprises a movable seat 801, the movable seat 801 is of an L-shaped structure capable of rotating 90 degrees clockwise, a vertical section of the movable seat 801 is hinged to the front end of the telescopic arm 503, a transverse section of the movable seat 801 is arranged at the upper end of the telescopic arm 503, a luffing cylinder 802 is hinged to the transverse section of the movable seat 801, the other end of the luffing cylinder 802 and the vertical section of the movable seat 801 are both hinged to a connecting piece 803, a vertical spiral swing cylinder 7 is arranged on the connecting piece 803, and the upper end and the lower end of the spiral swing cylinder 7 are connected to the clamping assembly 9.
The clamping assembly 9 comprises a clamp 901 and a clamping turning plate 902, wherein the clamp 901 is in a T shape rotating 90 degrees clockwise, a clamping oil cylinder 903 is hinged to the lower end of a vertical plate of the clamp 901, the other end of the clamping oil cylinder 903 is fixed to the clamping turning plate 902, and the lower end of the clamping turning plate 902 is hinged to the outer end of a horizontal plate of the clamp 901.
The base 4 is rotatably arranged on the frame 1 through a rotary speed reducer 6, an inner ring of the rotary speed reducer 6 is fixedly connected with the base 4, an upper hinge point and a lower hinge point are arranged on the base 4, the upper hinge point is hinged with the lifting arm 501, and the lower hinge point is hinged with the first lifting oil cylinder 502.
Lifting arm 501 and flexible arm 503 are cavity structure, and the lower extreme of lifting arm 501 articulates there is first lifting cylinder 502's the other end, and lifting arm 501 is inside to be fixedly equipped with flexible hydro-cylinder, and flexible hydro-cylinder's the other end is fixed to be set up in flexible arm 503 inside.
The shovel plate mechanism 3 comprises a shovel plate 301 and a second lifting oil cylinder 302, a mounting seat 303 is arranged at the bottom end of the frame 1, the second lifting oil cylinder 302 and the shovel plate 301 are respectively hinged to the upper end and the lower end of the mounting seat 303, and the other end of the second lifting oil cylinder 302 is hinged to the shovel plate 301, as shown in fig. 4.
In the operation of the bracket carrier for coal mines, taking the door bracket 100 as an example, firstly, the clamping cylinder 903 is contracted, the clamping turning plate 902 is in an unclamped state, the amplitude changing cylinder 802 is stretched, the clamping assembly 9 is in a slightly downward state, then, according to the position of the door bracket 100, the telescopic cylinder 5, the first lifting cylinder 502 and the rotary speed reducer 6 are correspondingly adjusted, when the clamping assembly 9 is arranged at the lower end of the door bracket 100, the clamping cylinder 903 is stretched, the door bracket 100 is clamped by the clamping turning plate 902, the amplitude changing cylinder 802 is contracted, the clamping assembly 9 keeps the horizontal position, then, the supporting legs of the door bracket 100 are contracted, then, the first lifting cylinder 502 and the telescopic cylinder are contracted, then, the door bracket is adjusted to a proper transportation state through the left and right rotation of the spiral swing cylinder 7, then, the crawler travel mechanism 2 is started to work, the crawler travel is started to the next supporting position, if a barrier is met on the road, the second lifting cylinder 302 is opened, the second lifting cylinder 302 is stretched, the shovel 301 starts to clean the barrier work, the travel can be smoother, the travel efficiency is accelerated, and when the crawler travel is completed, the supporting legs of the door bracket 100 is properly adjusted to the position through the spiral swing cylinder 7, the amplitude changing cylinder and the supporting cylinder 6. In the whole work, the power mechanism 10 is carried along with the vehicle, so that the problem that the cable is dragged back and forth is effectively avoided. The crawler travelling mechanism is a chassis, so that the working procedures of paving the tracks are reduced, the labor is reduced, and the carrying efficiency is improved.
Claims (5)
1. The utility model provides a support carrier for colliery which characterized in that: the lifting type crawler belt shovel comprises a frame (1), a crawler belt walking mechanism (2), a shovel plate mechanism (3), a carrying mechanism, a power mechanism (10) and a counterweight mechanism (11), wherein the frame (1) is arranged at the upper end of the crawler belt walking mechanism (2), the carrying mechanism is rotatably arranged at one side of the upper end of the frame (1), and the liftable shovel plate mechanism (3) is arranged at the lower end of the frame;
the carrying mechanism comprises a telescopic mechanism (5) and a clamping assembly (9), the telescopic mechanism (5) comprises a lifting arm (501), a telescopic arm (503) and a base (4), the base (4) is rotatably arranged on the frame (1), the lifting arm (501) and a first lifting cylinder (502) are hinged on the base (4), the other end of the first lifting cylinder (502) is hinged on the lifting arm (501), a telescopic cylinder is arranged in the lifting arm (501), the other end of the telescopic cylinder is arranged on the inner wall of the telescopic arm (503), the end part of the telescopic arm (503) is connected with the clamping assembly (9) through a connecting assembly (8), the clamping assembly is connected on a connecting assembly capable of swinging up and down and swinging left and right, the connecting assembly (8) comprises a movable seat (801), the movable seat (801) is of an L shape which rotates clockwise by 90 DEG, the vertical section of the movable seat (801) is fixed at the front end of the telescopic arm (503), the movable seat (801) is arranged at the upper end of the telescopic cylinder (801) which is hinged with the movable section (803) of the movable section (801) which is arranged at the upper end of the movable section (801) and the movable section (803) which is hinged on the movable section (803) of the movable section (801), be equipped with vertical spiral swing hydro-cylinder (7) on connecting piece (803), the upper and lower both ends of spiral swing hydro-cylinder (7) are connected on clamping assembly (9), clamping assembly (9) are including holder (901) and centre gripping and are turned over board (902), holder (901) are clockwise rotation 90's T style of calligraphy, the vertical board lower extreme hinge of holder (901) is equipped with centre gripping hydro-cylinder (903), the other end of centre gripping hydro-cylinder (903) is fixed on centre gripping is turned over board (902), the lower extreme of centre gripping is turned over board (902) with the outer tip of the horizontal plate of holder (901) hinges together.
2. A coal mine support truck as claimed in claim 1, wherein: the base (4) is rotatably arranged on the frame (1) through a rotary speed reducer (6), an inner ring of the rotary speed reducer (6) is fixedly connected with the base (4), an upper hinge point and a lower hinge point are arranged on the base (4), the upper hinge point is hinged with the lifting arm (501), and the lower hinge point is hinged with the first lifting oil cylinder (502).
3. A coal mine support truck as claimed in claim 1, wherein: the lifting arm (501) and the telescopic arm (503) are of a cavity structure, the lower end of the lifting arm (501) is hinged with the other end of the first lifting oil cylinder (502), the telescopic oil cylinder is fixedly arranged in the lifting arm (501), and the other end of the telescopic oil cylinder is fixedly arranged in the telescopic arm (503).
4. A coal mine support truck as claimed in claim 1, wherein: the shovel plate mechanism (3) comprises a shovel plate (301) and a second lifting oil cylinder (302), an installation seat (303) is arranged at the bottom end of the frame (1), the second lifting oil cylinder (302) and the shovel plate (301) are respectively hinged to the upper end and the lower end of the installation seat (303), and the other end of the second lifting oil cylinder (302) is hinged to the shovel plate (301).
5. A coal mine support truck as claimed in claim 1, wherein: the other side of the upper end of the frame (1) is provided with the power mechanism (10) and the counterweight mechanism (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070230.7A CN112124176B (en) | 2020-10-09 | 2020-10-09 | Support carrier for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011070230.7A CN112124176B (en) | 2020-10-09 | 2020-10-09 | Support carrier for coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112124176A CN112124176A (en) | 2020-12-25 |
| CN112124176B true CN112124176B (en) | 2023-09-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011070230.7A Active CN112124176B (en) | 2020-10-09 | 2020-10-09 | Support carrier for coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112124176B (en) |
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| CN112849893B (en) * | 2021-02-08 | 2022-09-13 | 日日顺供应链科技股份有限公司 | Clamping vehicle and flat warehouse management system |
| CN113668627B (en) * | 2021-08-12 | 2022-06-24 | 山东塔高矿业机械装备制造有限公司 | Telescopic crawler support carrier and support carrying method |
| CN113954980A (en) * | 2021-11-05 | 2022-01-21 | 中国科学技术大学 | Multifunctional push plate with variable angle |
| CN115385271A (en) * | 2022-09-19 | 2022-11-25 | 中国煤炭科工集团太原研究院有限公司 | Underground coal mine support and transfer system |
| CN115416560B (en) * | 2022-09-19 | 2024-03-26 | 中国煤炭科工集团太原研究院有限公司 | Storage battery rubber-tyred vehicle for carrying unit bracket |
| CN115447467B (en) * | 2022-09-23 | 2024-03-26 | 中国煤炭科工集团太原研究院有限公司 | Mining engine driving rubber wheel type double cab unit support transfer robot |
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| CN108487346A (en) * | 2018-02-06 | 2018-09-04 | 黔西南州万宏机械制造有限责任公司 | A kind of bracket system and its control system of loading machine handgrip |
| CN108946589A (en) * | 2018-07-11 | 2018-12-07 | 中国煤炭科工集团太原研究院有限公司 | Operating mechanism for underground coal mine superduty shovel-type support conveying vehicle |
| CN109502262A (en) * | 2018-12-28 | 2019-03-22 | 北京新能雅特科技发展有限公司 | A kind of coal mine unit rack carrying implement |
| CN109467013A (en) * | 2018-12-29 | 2019-03-15 | 航天重型工程装备有限公司 | A kind of snatch vehicle |
| CN210393495U (en) * | 2019-03-19 | 2020-04-24 | 山西铭鑫隆煤矿机械设备有限公司 | Carrying crane |
| CN110844846A (en) * | 2019-12-23 | 2020-02-28 | 湖南杰希重工有限公司 | Carrier vehicle |
| CN110979491A (en) * | 2019-12-28 | 2020-04-10 | 中国煤炭科工集团太原研究院有限公司 | Crawler-type does not have and supports singly strides support carrier repeatedly |
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| CN112124176A (en) | 2020-12-25 |
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