CN110924873A - Drilling machine and mast deflection mechanism thereof - Google Patents
Drilling machine and mast deflection mechanism thereof Download PDFInfo
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- CN110924873A CN110924873A CN201911126073.4A CN201911126073A CN110924873A CN 110924873 A CN110924873 A CN 110924873A CN 201911126073 A CN201911126073 A CN 201911126073A CN 110924873 A CN110924873 A CN 110924873A
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- deflection
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- connecting rod
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- 230000007246 mechanism Effects 0.000 title claims abstract description 49
- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 238000010276 construction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000036544 posture Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/003—Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling machine and a mast deflection mechanism thereof.A sliding frame is hinged with a deflection support at a hinge point A through a hinge shaft, and a first deflection oil cylinder and a second deflection oil cylinder are respectively arranged at two sides of the deflection support; the cylinder barrel of the first deflection oil cylinder is hinged to the first side of the deflection support through a hinge point E, and the cylinder barrel of the second deflection oil cylinder is hinged to the second side of the deflection support through a hinge point E'; on the first side of the deflection support, one end of a first connecting rod is hinged to the sliding frame through a hinge point B, the other end of the first connecting rod is hinged to a second connecting rod and a piston rod of the first deflection oil cylinder through a hinge point C, the other end of the second connecting rod is hinged to the deflection support through a hinge point D, on the second side of the deflection support, one end of a third connecting rod is hinged to the sliding frame through a hinge point B ', the other end of the third connecting rod is hinged to a fourth connecting rod and a piston rod of the second deflection oil cylinder through a hinge point C ', and the other end of the fourth connecting rod is hinged to the deflection support through a hinge point D '.
Description
Technical Field
The invention belongs to the technical field of engineering machinery, and particularly relates to a drilling machine and a mast deflection mechanism thereof.
Background
In the construction process of the crawler-type jumbolter, the mast needs to be adjusted in angle to carry out drilling operation on different operation surfaces, the mast is vertically downward and horizontally arranged at the left side to form two common working postures, and the adjustment and the maintenance of the similar postures are mainly realized by a luffing mechanism.
The amplitude changing mechanism of the crawler-type anchor rod drilling machine comprises structural components such as a connecting frame, a large arm, a sliding frame support, a sliding frame and the like and various driving oil cylinders, and can realize large arm pitching and yawing, mast pitching, yawing and sliding. The horizontal posture of the left side of the mast is mainly realized by a mast deflection mechanism, and the mast deflection mechanism comprises a sliding frame support, a sliding frame and a sliding frame deflection oil cylinder.
In a common mast deflection mechanism, two sides of a carriage support are respectively provided with a deflection hinge point, namely a hinge point a and a hinge point b, and a sector area a and an area b are correspondingly hinged in a mast deflection range when the hinge point a and the hinge point b are respectively hinged. When the drilling machine needs to be constructed in the range of the area a, the sliding frame deflection oil cylinder needs to be hinged at a hinge point a, if the drilling machine needs to be constructed in the range of the area b temporarily, a pin shaft at the end of a piston rod needs to be taken down, and the position of the hinge point is changed into a hinge point b.
The prior art has the following defects: the existing mast deflection mechanism is based on a crank rocker mechanism, the mechanism has dead points, and the requirement that the mast swings in a range of (-90 degrees, +90 degrees) or more cannot be met under the condition that no hinge point is additionally arranged, so that at least two hinge points are required. In the construction process, the hinge point needs to be manually replaced to adjust the mast from the horizontal posture of one side to the horizontal posture of the other side, so that the safety risk and the labor intensity are increased, and the construction efficiency is also reduced.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a drilling machine and a mast deflection mechanism thereof.
The technical scheme adopted by the invention is as follows:
the mast deflection mechanism comprises a sliding frame, a deflection support, a first deflection oil cylinder, a first connecting rod, a second deflection oil cylinder, a third connecting rod and a fourth connecting rod, wherein the sliding frame is hinged with the deflection support, and the sliding frame is used for mounting a mast;
the sliding frame is hinged with the deflection support through a hinge shaft at a hinge point A, and the first deflection oil cylinder and the second deflection oil cylinder are respectively arranged on two sides of the deflection support;
the cylinder barrel of the first deflection oil cylinder is directly or indirectly hinged on the first side of the deflection support through a hinge point E, and the cylinder barrel of the second deflection oil cylinder is directly or indirectly hinged on the second side of the deflection support through a hinge point E';
on the first side of the deflection support, one end of a first connecting rod is hinged on the sliding frame through a hinge point B, the other end of the first connecting rod is hinged with a second connecting rod and a piston rod of the first deflection oil cylinder through a hinge point C, the other end of the second connecting rod is hinged on the deflection support through a hinge point D,
on the second side of the deflection support, one end of a third connecting rod is hinged to the sliding frame through a hinge point B ', the other end of the third connecting rod is hinged to a fourth connecting rod and a piston rod of the second deflection oil cylinder through a hinge point C ', and the other end of the fourth connecting rod is hinged to the deflection support through a hinge point D '.
In some embodiments, the mast yawing mechanism further comprises a first oil pipe and a second oil pipe;
the first oil pipe is communicated with the large cavity of the first deflection oil cylinder and the small cavity of the second deflection oil cylinder;
and the second oil pipe is communicated with the large cavity of the second deflection oil cylinder and the small cavity of the first deflection oil cylinder.
In some embodiments, the hinge point E is near the small cavity end of the first yaw cylinder barrel;
and the hinge point E' is close to the small cavity end of the second deflection oil cylinder barrel.
In some embodiments, the cylinder barrels of the first and second yaw cylinders are provided with cylinder barrel hinge lugs, and the first and second yaw cylinders are hinged on the yaw support through the cylinder barrel hinge lugs.
In some embodiments, the hinge point C is near the end of the piston rod of the first yaw cylinder;
and the hinge point C' is close to the end part of the piston rod of the second deflection oil cylinder.
In some embodiments, the piston rod ends of the first and second yawing cylinders are provided with a piston rod hinge lug, the first yawing cylinder is hinged at the hinge point C through the piston rod hinge lug, and the second yawing cylinder is hinged at the hinge point C' through the piston rod hinge lug.
In some embodiments, the mast yaw mechanism is a symmetrical structure.
In some embodiments, the mast yawing mechanism, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are of a plate-split hinged type or a plate-split welded type or an integrated type structure.
In some embodiments, the mast deflecting mechanism is provided with a carriage box body, and the hinge point a, the hinge point B and the hinge point B' are integrated on the carriage box body.
In a second aspect, the invention also provides a drilling rig comprising the mast yawing mechanism.
Has the advantages that: the drilling machine and the mast deflection mechanism thereof provided by the invention have the advantages that the mast of the drilling machine can swing within a range of (-90 degrees, +90 degrees) or more, and the hinge point of the pin shaft does not need to be manually disassembled and replaced, so that the labor intensity is reduced, the construction safety is enhanced, and the construction efficiency is improved.
Drawings
FIG. 1 is a side perspective view of a mast yaw mechanism of an embodiment;
FIG. 2 is a bottom view of the mast yaw mechanism of the embodiment;
FIG. 3 is a bottom view of the mast yaw mechanism of the embodiment shown in a-90 ° yaw;
FIG. 4 is a schematic diagram of an embodiment of a multi-link assembly mechanism;
FIG. 5 is a schematic structure diagram of a dual cylinder multi-link luffing mechanism of the embodiment;
in the figure: the device comprises a sliding frame 1, a deflection support 2, a first deflection oil cylinder 3, a first connecting rod 4, a second connecting rod 5, a second deflection oil cylinder 6, a third connecting rod 7, a fourth connecting rod 8, a first oil pipe 9 and a second oil pipe 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the invention, a crank rocker mechanism is combined with a simple plane four-bar mechanism, and the principle is shown in figure 4. When the driving oil cylinder CE stretches and retracts, the proper rod length is adopted, and the sliding frame AB can be driven to swing within a range of (-90 degrees, +90 degrees) or more relative to the base AD.
On the basis of the multi-connecting-rod combined mechanism, a double-oil-cylinder redundancy design scheme is adopted, and two groups of connecting rod mechanisms shown in the figure 4 are symmetrically arranged to form an ABCDE + A ' B ' C ' D ' E ' double-oil-cylinder multi-connecting-rod combined deflection mechanism, which is shown in figure 5. When the mast is near the limit position, one group of connecting rods in the two groups of connecting rod mechanisms has a larger transmission angle and is used for bearing most external loads, the other group of connecting rods with a smaller transmission angle bears less external loads, and the bearing states of the two groups of connecting rod mechanisms are changed when the mast deflects to be near the other limit position, so that the stable change of the internal force of each connecting rod group in the deflection process of the mast is ensured.
Example 1
As shown in fig. 1 and 2, a mast yaw mechanism comprises a carriage 1 and a yaw support 2, wherein the carriage 1 is hinged to the yaw support 2, the carriage 1 is used for mounting a mast, and the mast yaw mechanism further comprises a first yaw cylinder 3, a first connecting rod 4, a second connecting rod 5, a second yaw cylinder 6, a third connecting rod 7 and a fourth connecting rod 8;
the sliding frame 1 is hinged with the deflection support 2 at a hinge point A through a hinge shaft, and a first deflection oil cylinder 3 and a second deflection oil cylinder 6 are respectively arranged on two sides of the deflection support 2;
the cylinder barrel of the first deflection oil cylinder 3 is directly or indirectly hinged on the first side of the deflection support 2 through a hinge point E, and the cylinder barrel of the second deflection oil cylinder 6 is directly or indirectly hinged on the second side of the deflection support 2 through a hinge point E';
on the first side of the deflection support 2, one end of a first connecting rod 4 is hinged on the sliding frame 1 through a hinge point B, the other end of the first connecting rod 4 is hinged with a second connecting rod 5 and a piston rod of a first deflection oil cylinder 3 through a hinge point C, the other end of the second connecting rod 5 is hinged on the deflection support 2 through a hinge point D,
on the second side of the deflection support 2, one end of a third connecting rod 7 is hinged on the sliding frame 1 through a hinge point B ', the other end of the third connecting rod 7 is hinged with a fourth connecting rod 8 and a piston rod of the second deflection oil cylinder 6 through a hinge point C ', and the other end of the fourth connecting rod 8 is hinged on the deflection support 2 through a hinge point D '.
In some embodiments, as shown in fig. 2 and 3, the mast yaw mechanism adopts an oil cavity communication manner of a redundant yaw driving cylinder, and comprises a first oil pipe 9 and a second oil pipe 10; the first oil pipe 9 is communicated with the large cavity of the first deflection oil cylinder 3 and the small cavity of the second deflection oil cylinder 6; and the second oil pipe 10 is communicated with the large cavity of the second deflection oil cylinder 6 and the small cavity of the first deflection oil cylinder 3.
In some embodiments, as shown in fig. 2 and 3, the hinge point E is close to the small cavity end of the cylinder barrel of the first yaw cylinder 3; the hinge point E' is close to the small cavity end of the cylinder barrel of the second deflection oil cylinder 6.
In some embodiments, as shown in fig. 1, in the mast yawing mechanism, cylinder barrels of the first and second yawing cylinders 3, 6 are provided with cylinder barrel hinge lugs, and the first and second yawing cylinders 3, 6 are hinged on the yawing support 2 through the cylinder barrel hinge lugs.
In some embodiments, as shown in fig. 2 and 3, the hinge point C is close to the end of the piston rod of the first yaw cylinder 3; the hinge point C' is close to the end part of the piston rod of the second deflection oil cylinder 6.
In some embodiments, as shown in fig. 1, the piston rod ends of the first and second yawing cylinders 3, 6 are provided with a piston rod hinge lug, the first yawing cylinder 3 is hinged at the hinge point C through the piston rod hinge lug, and the second yawing cylinder 6 is hinged at the hinge point C' through the piston rod hinge lug.
In some embodiments, the mast yaw mechanism is a symmetrical structure, as shown in FIG. 2.
In some embodiments, as shown in fig. 1, the first link 4, the second link 5, the third link 7, and the fourth link 8 are plate split hinged; in other embodiments, the first link 4, the second link 5, the third link 7 and the fourth link 8 may be of a plate split welded type or an integral type structure.
In some embodiments, as shown in fig. 1, the carriage 1 is connected to a carriage box, and the hinge point a, the hinge point B, and the hinge point B' are integrated on the carriage box.
When the mast needs to rotate to-90 degrees, the second deflection oil cylinder 6 retracts, the first deflection oil cylinder 3 extends, and the first connecting rod 4 and the second connecting rod 5 drive the mast to swing to a target position under the driving action of the oil cylinders, as shown in fig. 3. When the mast needs to rotate by +90 degrees, the telescopic directions of the two oil cylinders are opposite to the telescopic directions.
Example 2
A drilling machine comprises the mast deflection mechanism.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the claimed invention.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. A mast deflection mechanism comprises a sliding frame (1) and a deflection support (2), wherein the sliding frame (1) is hinged with the deflection support (2), and the sliding frame (1) is used for mounting a mast, and is characterized by further comprising a first deflection oil cylinder (3), a first connecting rod (4), a second connecting rod (5), a second deflection oil cylinder (6), a third connecting rod (7) and a fourth connecting rod (8);
the sliding frame (1) is hinged with the deflection support (2) at a hinge point A through a hinge shaft, and the first deflection oil cylinder (3) and the second deflection oil cylinder (6) are respectively arranged on two sides of the deflection support (2);
the cylinder barrel of the first deflection oil cylinder (3) is directly or indirectly hinged on the first side of the deflection support (2) through a hinge point E, and the cylinder barrel of the second deflection oil cylinder (6) is directly or indirectly hinged on the second side of the deflection support (2) through a hinge point E';
on the first side of the deflection support (2), one end of a first connecting rod (4) is hinged on the sliding frame (1) through a hinge point B, the other end of the first connecting rod (4) is hinged with a second connecting rod (5) and a piston rod of a first deflection oil cylinder (3) through a hinge point C, the other end of the second connecting rod (5) is hinged on the deflection support (2) through a hinge point D,
on the second side of the deflection support (2), one end of a third connecting rod (7) is hinged to the sliding frame (1) through a hinge point B ', the other end of the third connecting rod (7) is hinged to a fourth connecting rod (8) and a piston rod of the second deflection oil cylinder (6) through a hinge point C ', and the other end of the fourth connecting rod (8) is hinged to the deflection support (2) through a hinge point D '.
2. A mast yaw mechanism according to claim 1, further comprising a first oil pipe (9), a second oil pipe (10);
the first oil pipe (9) is communicated with a large cavity of the first deflection oil cylinder (3) and a small cavity of the second deflection oil cylinder (6);
and the second oil pipe (10) is communicated with the large cavity of the second deflection oil cylinder (6) and the small cavity of the first deflection oil cylinder (3).
3. A mast yawing mechanism according to claim 1, wherein the hinge point E is near a small bore end of the bore of the first yawing cylinder (3);
and/or the hinge point E' is close to the small cavity end of the cylinder barrel of the second deflection oil cylinder (6).
4. The mast yawing mechanism of claim 1, wherein the cylinder barrels of the first yawing cylinder (3) and the second yawing cylinder (6) are provided with cylinder barrel hinge lugs, and the first yawing cylinder (3) and the second yawing cylinder (6) are hinged on the yawing support (2) through the cylinder barrel hinge lugs.
5. A mast yawing mechanism according to claim 1, wherein the pivot point C is near a piston rod end of the first yawing cylinder (3);
and/or the hinge point C' is close to the end part of the piston rod of the second deflection oil cylinder (6).
6. A mast yawing mechanism according to claim 1, wherein the piston rod ends of the first and second yawing cylinders (3, 6) are provided with a piston rod hinge lug, the first yawing cylinder (3) is hinged at a hinge point C through the piston rod hinge lug, and the second yawing cylinder (6) is hinged at a hinge point C' through the piston rod hinge lug.
7. A mast yaw mechanism according to claim 1, wherein the mast yaw mechanism is a symmetrical structure.
8. A mast yaw mechanism according to claim 1, wherein the first link (4), the second link (5), the third link (7) and the fourth link (8) are of a plate split hinged type, a plate split welded type or an integral type structure.
9. A mast yawing mechanism according to claim 1, wherein the carriage (1) is provided with a carriage box, and the pivot points a, B' are integrated into the carriage box.
10. A drilling rig comprising a mast yaw mechanism as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911126073.4A CN110924873A (en) | 2019-11-18 | 2019-11-18 | Drilling machine and mast deflection mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911126073.4A CN110924873A (en) | 2019-11-18 | 2019-11-18 | Drilling machine and mast deflection mechanism thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110924873A true CN110924873A (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911126073.4A Pending CN110924873A (en) | 2019-11-18 | 2019-11-18 | Drilling machine and mast deflection mechanism thereof |
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| Country | Link |
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| CN (1) | CN110924873A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2858926Y (en) * | 2005-07-27 | 2007-01-17 | 中南大学 | Articulated drillng holder lifting luffer for open drill |
| US20070240891A1 (en) * | 2006-04-14 | 2007-10-18 | Egtechnology S.P.A. | Drilling machine |
| CN201963207U (en) * | 2011-01-25 | 2011-09-07 | 郑州宇通重工有限公司 | Jumbolter with two four-bar mechanisms |
| CN102678062A (en) * | 2012-05-24 | 2012-09-19 | 北京市三一重机有限公司 | Support mechanism and rotary drill rig |
| CN204266919U (en) * | 2014-11-13 | 2015-04-15 | 青岛达邦钻机有限责任公司 | For the tunneling boring rapid drilling drill carriage of the large emptying aperture parallel cut blasting in tunnel |
| CN107939284A (en) * | 2017-12-08 | 2018-04-20 | 中国铁建重工集团有限公司 | A kind of open air drill rig |
| CN109441347A (en) * | 2018-11-27 | 2019-03-08 | 江苏徐工工程机械研究院有限公司 | Multifunctional drilling machine for tunnel |
| EP3536892A1 (en) * | 2018-01-22 | 2019-09-11 | Casagrande S.P.A. | Drilling machine |
| CN209539287U (en) * | 2019-02-28 | 2019-10-25 | 重庆平山矿山机电设备有限公司 | A kind of double guide rail drilling machine propulsion devices |
-
2019
- 2019-11-18 CN CN201911126073.4A patent/CN110924873A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2858926Y (en) * | 2005-07-27 | 2007-01-17 | 中南大学 | Articulated drillng holder lifting luffer for open drill |
| US20070240891A1 (en) * | 2006-04-14 | 2007-10-18 | Egtechnology S.P.A. | Drilling machine |
| CN201963207U (en) * | 2011-01-25 | 2011-09-07 | 郑州宇通重工有限公司 | Jumbolter with two four-bar mechanisms |
| CN102678062A (en) * | 2012-05-24 | 2012-09-19 | 北京市三一重机有限公司 | Support mechanism and rotary drill rig |
| CN204266919U (en) * | 2014-11-13 | 2015-04-15 | 青岛达邦钻机有限责任公司 | For the tunneling boring rapid drilling drill carriage of the large emptying aperture parallel cut blasting in tunnel |
| CN107939284A (en) * | 2017-12-08 | 2018-04-20 | 中国铁建重工集团有限公司 | A kind of open air drill rig |
| EP3536892A1 (en) * | 2018-01-22 | 2019-09-11 | Casagrande S.P.A. | Drilling machine |
| CN109441347A (en) * | 2018-11-27 | 2019-03-08 | 江苏徐工工程机械研究院有限公司 | Multifunctional drilling machine for tunnel |
| CN209539287U (en) * | 2019-02-28 | 2019-10-25 | 重庆平山矿山机电设备有限公司 | A kind of double guide rail drilling machine propulsion devices |
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