CN104989394A - Manual downhole safety scaler - Google Patents
Manual downhole safety scaler Download PDFInfo
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- CN104989394A CN104989394A CN201510313523.6A CN201510313523A CN104989394A CN 104989394 A CN104989394 A CN 104989394A CN 201510313523 A CN201510313523 A CN 201510313523A CN 104989394 A CN104989394 A CN 104989394A
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- pneumatic pick
- vehicle frame
- cylinder
- guiding link
- switch
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Abstract
A manual downhole safety scaler comprises a vehicle frame, wheels arranged at the lower ends of the front half part of the vehicle frame, supporting legs arranged at the lower end of the rear half part of the vehicle frame, handles arranged at the rear end of the vehicle frame, an inclined guide connecting frame hinged to the vehicle frame, a connecting rod mechanism hinged between the vehicle frame and the guide connecting frame, an air pick base movably arranged on the guide connecting frame, an air pick mounted on the air pick base, an inclined air cylinder hinged to the vehicle frame, a buffering mechanism arranged between a piston rod of the air cylinder and the air pick, an air source tank arranged on the vehicle frame and an air pick switch operation mechanism used for turning on an air pick switch. One handle is provided with a handle valve used for controlling the air cylinder to act. The air source tank is connected with an air port of the air cylinder through the handle valve and a pipe. The air source tank is connected with an air port of the air pick through a pipe. The operating end of the air pick switch operation mechanism is arranged on one handle. The manual downhole safety scaler can effectively improve the scaling efficiency, reduce the labor intensity of operators and guarantee the safety of the scaling operators.
Description
Technical field
The present invention relates to a kind of mine down-hole implement, be specifically related to a kind of down-hole manual safety pinch machine.
Background technology
After underground blasting, in tunnel and stope, more float stone can be produced, under usually needing artificial crowbar to be prized by float stone.But, operating personnel with crowbar sled float stone operation process workload large, labour intensity is high, and efficiency is lower, also there is larger potential safety hazard.
Need a kind of pinch machine in prior art badly, effectively can improve the operating efficiency of sled hair, reduce the labour intensity of operating personnel, ensure the safety of sled hair operating personnel.
Summary of the invention
The object of the invention is the deficiency existed to overcome prior art, provide a kind of effectively can improve sled hair operating efficiency, reduce the labour intensity of operating personnel, ensure the down-hole manual safety pinch machine of the safety of sled hair operating personnel.
The present invention is achieved by the following technical solutions: a kind of down-hole manual safety pinch machine, comprise vehicle frame, be arranged at the wheel of the first half lower end of vehicle frame, be arranged at the supporting leg of the latter half lower end of vehicle frame, be arranged at the handle of vehicle frame rear end, be articulated with the guiding link of the inclination on vehicle frame, be articulated with the linkage between vehicle frame and guiding link, be movably set in the pneumatic pick seat on guiding link, be installed on the pneumatic pick on pneumatic pick seat, be articulated with the cylinder of the inclination on vehicle frame, be arranged at the buffer gear between the piston rod of cylinder and pneumatic pick, be arranged at the source of the gas tank on vehicle frame and the pneumatic pick switch operating mechanism for opening pneumatic pick switch, described handle is provided with the handle valve for controlling described cylinder action, described source of the gas tank is connected with the gas port of described cylinder by described handle valve and pipeline, described source of the gas tank is connected by the gas port of pipeline with described pneumatic pick, the operating side of described pneumatic pick switch operating mechanism is arranged on described handle.
Described pneumatic pick switch operating mechanism comprises the junction plate being articulated with handle lower end, be fixedly connected on the brake holding rod of junction plate one end, the articulated elements hinged with the other end of junction plate, be arranged at the switch depression bar of the switch side of described pneumatic pick, the brake cable of arranging along cabling locating part being connected to the multiple cabling locating part on vehicle frame and guiding link and being connected between switch depression bar and articulated elements, middle part and the described pneumatic pick seat of described switch depression bar are hinged, the top of described switch depression bar and the switch of described pneumatic pick touch, the bottom of described switch depression bar is connected with described brake cable, described brake holding rod is the operating side of pneumatic pick switch operating mechanism.
Described brake cable comprises spool, be arranged at the wire in spool and be arranged at the positioning head of head and the tail two ends of spool, two described positioning heads are spacing by corresponding cabling locating part respectively, it is protruding that the initial and end section of described wire is each passed through two positioning heads, first section of described wire is fixedly connected with described articulated elements, the rear of described wire is fixedly connected with the bottom of described switch depression bar, is provided with back-moving spring between the bottom of described switch depression bar and described pneumatic pick seat.
Described lifting regulating mechanism is linkage, this linkage comprises sleeve, two adjusting nuts and two screw rods, two rotating spacing upper port and lower port places being connected to described sleeve of described adjusting nut, two described screw rods penetrate in described sleeve from the upper port of described sleeve and lower port respectively, adjusting nut and respective threaded rod are spirally connected, upper end and the described guiding link of a screw rod are hinged, and lower end and the described vehicle frame of another root screw rod are hinged.
Described lifting regulating mechanism is lift adjustment cylinder, lower end and the described vehicle frame of lift adjustment cylinder are hinged, upper end and the described guiding link of the piston rod upwards extended of lift adjustment cylinder are hinged, described handle are provided with the handle valve for controlling the action of described lift adjustment cylinder.
Described guiding link comprises the guiding link body hinged with described vehicle frame and is arranged at the sliding extension frame of link body front end of leading, the first half of described guiding link body is provided with two guide pegs be parallel to each other, described sliding extension frame corresponds to two guide pegs and is provided with two sleeve pipes, sliding extension frame is connected in the front end of described guiding link body by sleeve pipe and guide peg, described pneumatic pick seat is fixedly connected on described sliding extension frame, described buffer gear slides and is arranged on described sliding extension frame, described buffer gear is connected by wire rope with described pneumatic pick seat.
Described buffer gear comprises mount pad, buffer spring and stripper plate, described mount pad is by base, uprightly be connected to the front end-plate of pan frontward end, what be arranged at front end-plate front end supports head, the end plate and the connecting cylinder be connected between front end-plate and end plate that are uprightly connected to base rear end are formed, described buffer spring is sheathed on described connecting cylinder, through hole is provided with in the middle part of described stripper plate, stripper plate is sheathed on connecting cylinder, and stripper plate is between described buffer spring and described end plate, the rear and front end of described buffer spring supports described front end-plate and described stripper plate respectively, the piston rod of described cylinder is connected with described stripper plate by connector, the described rear end supporting head and described pneumatic pick touches.
Described guiding link is provided with two guide connecting rods be parallel to each other, and described base corresponds to these two guide connecting rods and is provided with two gathering sills, and base is coordinated to slide be arranged on described guiding link by gathering sill and guide connecting rod.
Described pneumatic pick seat is provided with two gathering sills corresponding to two guide connecting rods be parallel to each other, described pneumatic pick seat is coordinated to slide be arranged on described guiding link by gathering sill and guide connecting rod, described pneumatic pick seat has been bolted to connection two half-round metal locking belts, described pneumatic pick lock onto between described pneumatic pick seat and two described half-round metal locking belts.
The lower end of the base of described mount pad and the lower end of described pneumatic pick seat are provided with connection bolt, are connected with wire rope between the connection bolt of base and the connection bolt of pneumatic pick seat.
The invention has the beneficial effects as follows: the present invention effectively can improve the operating efficiency of sled hair, reduce the labour intensity of operating personnel, and ensure the safety of sled hair operating personnel.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiments of the invention 1;
Fig. 2 is the structure for amplifying schematic diagram in the A portion of Fig. 1;
Fig. 3 is the structural representation of embodiments of the invention 2.
In the drawings: 1-vehicle frame; 2-wheel; 3-supporting leg; 4-handle; 5-handle valve; 6-brakes holding rod; 7-junction plate; 8-articulated elements; 9-brake cable; 10-wire; 11-positioning head; 12-cabling locating part; 13-cylinder; 14-leads link; 15-linkage; 16-buffer gear; 17-mount pad; 18-buffer spring; 19-supports head; 20-stripper plate; 21-connector; 22-pneumatic pick; 23-switch; 24-switch depression bar; 25-pneumatic pick seat; 26-half-round metal locking belt; 27-connection bolt; 28-wire rope; 29-back-moving spring; 30-lift adjustment cylinder; 31-sliding extension frame.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, a kind of down-hole manual safety pinch machine, comprise vehicle frame 1, be arranged at the wheel 2 of the first half lower end of vehicle frame 1, be arranged at the supporting leg 3 of the latter half lower end of vehicle frame 1, be arranged at the handle 4 of vehicle frame 1 rear end, be articulated with the guiding link 14 of the inclination on vehicle frame 1, be articulated with the linkage 15 between vehicle frame 1 and guiding link 14, be movably set in the pneumatic pick seat 25 on guiding link 14, be installed on the pneumatic pick 22 on pneumatic pick seat 25, be articulated with the cylinder 13 of the inclination on vehicle frame 1, be arranged at the buffer gear 16 between the piston rod of cylinder 13 and pneumatic pick 22, be arranged at the source of the gas tank (not shown in FIG.) on vehicle frame 1 and the pneumatic pick switch operating mechanism for opening pneumatic pick switch, handle 4 is provided with the handle valve 5 for control cylinder 13 action, source of the gas tank is connected with the gas port of cylinder 13 by handle valve 5 and pipeline, source of the gas tank is connected by the gas port of pipeline with pneumatic pick 22, the operating side of pneumatic pick switch operating mechanism is arranged on handle 4.
During work, operating personnel is positioned at the rear side of vehicle frame 1, hold handle 4, the present invention is pushed into operating location, promote pneumatic pick 22 by handle valve 5 control cylinder 13 on handle 4 to move, control pneumatic pick 22 by the operating side of the pneumatic pick switch operating mechanism on handle 4 to work, regulated the inclined degree of guiding link 14 by linkage 15.In operation process, operating personnel can keep certain safe distance with pneumatic pick 22 above always, effectively ensure that the safety of operating personnel, also effectively improves sled hair operating efficiency, reduces the labour intensity of operating personnel.
As Fig. 1, shown in Fig. 2, pneumatic pick switch operating mechanism comprises the junction plate 7 being articulated with handle 4 lower end, be fixedly connected on the brake holding rod 6 of junction plate 7 one end, the articulated elements 8 hinged with the other end of junction plate 7, be arranged at the switch depression bar 24 of switch 23 side of pneumatic pick 22, the brake cable 9 of arranging along cabling locating part 12 being connected to the multiple cabling locating part 12 on vehicle frame 1 and guiding link 14 and being connected between switch depression bar 24 and articulated elements 8, middle part and the pneumatic pick seat 25 of switch depression bar 24 are hinged, the top of switch depression bar 24 and the switch 23 of pneumatic pick 22 touch, the bottom of switch depression bar 24 is connected with brake cable 9, brake holding rod 6 is the operating side of pneumatic pick switch operating mechanism.
In the course of work, hold with a firm grip brake holding rod 6 time, the bottom of brake cable 9 Drawing switch depression bar 24, makes the top of switch depression bar 24 support forward the switch 23 of pneumatic pick 22, pneumatic pick 22 is worked.
Wherein, brake cable 9 comprises spool, be arranged at the wire 10 in spool and be arranged at the positioning head 11 of head and the tail two ends of spool, two positioning heads 11 are spacing by corresponding cabling locating part 12 respectively, it is protruding that the initial and end section of wire 10 is each passed through two positioning heads 11, first section of wire 10 is fixedly connected with articulated elements 8, the rear of wire 10 is fixedly connected with the bottom of switch depression bar 24, is provided with back-moving spring 29 between the bottom of switch depression bar 24 and pneumatic pick seat 25.
See Fig. 1, lifting regulating mechanism is linkage 15, linkage 15 comprises sleeve, two adjusting nuts and two screw rods, two rotating spacing upper port and lower port places being connected to sleeve of adjusting nut, two screw rods penetrate in sleeve from the upper port of sleeve and lower port respectively, adjusting nut and respective threaded rod are spirally connected, and the upper end of a screw rod is hinged with guiding link 14, and lower end and the vehicle frame 1 of another root screw rod are hinged.
Can the extension elongation of adjusting screw(rod) by turning adjusting nut, thus regulate the inclined degree of guiding link 14.
As shown in Figure 2, buffer gear 16 comprises mount pad 17, buffer spring 18 and stripper plate 20, mount pad 17 is by base, uprightly be connected to the front end-plate of pan frontward end, what be arranged at front end-plate front end supports 19, the end plate and the connecting cylinder be connected between front end-plate and end plate that are uprightly connected to base rear end are formed, buffer spring 18 is sheathed on connecting cylinder, through hole is provided with in the middle part of stripper plate 20, stripper plate 20 is sheathed on connecting cylinder, and stripper plate 20 is between buffer spring 18 and end plate, the rear and front end of buffer spring 18 supports front end-plate and stripper plate 20 respectively, the piston rod of cylinder 13 is connected with stripper plate 20 by connector 21, support 19 to touch with the rear end of pneumatic pick 22.
Regulate pneumatic pick 22 position time, the piston rod of cylinder 13 stretches out, mount pad 17 front end support a 19 driven forward pneumatic pick 22, complete the adjustment of pneumatic pick 22 position.During work, buffer gear 16 effectively can alleviate reaction force when pneumatic pick 22 works, and protection mechanical connecting structure, reduces the working strength of operating personnel simultaneously.
See Fig. 2, guiding link 14 is provided with two guide connecting rods be parallel to each other, and base corresponds to these two guide connecting rods and is provided with two gathering sills, and base is coordinated to slide to be arranged at led on link 14 by gathering sill and guide connecting rod.
See Fig. 1, Fig. 2, pneumatic pick seat 25 is provided with two gathering sills corresponding to two guide connecting rods be parallel to each other, pneumatic pick seat 25 is coordinated to slide to be arranged at led on link 14 by gathering sill and guide connecting rod, pneumatic pick seat 25 has been bolted to connection two half-round metal locking belts 26, pneumatic pick 22 lock onto between pneumatic pick seat 25 and two half-round metal locking belts 26.
As shown in Figure 2, the lower end of the base of mount pad 17 and the lower end of pneumatic pick seat 25 are provided with connection bolt 27, are connected with wire rope 28 between the connection bolt 27 of base and the connection bolt 27 of pneumatic pick seat 25.When the piston rod retraction of cylinder 13, the base of mount pad 17 pulls pneumatic pick seat 25 downwards by wire rope 28, thus regulates the position of pneumatic pick 22.
Embodiment 2
The difference of the present embodiment and embodiment 1 is: as shown in Figure 3, and lifting regulating mechanism is lift adjustment cylinder 30, and guiding link 14 is provided with sliding extension frame 31 above.
See Fig. 3, lower end and the vehicle frame 1 of lift adjustment cylinder 30 are hinged, and the upper end of the piston rod upwards extended of lift adjustment cylinder 30 is hinged with guiding link 14, handle 4 is provided with the handle valve for controlling lift adjustment cylinder 30 action.Guiding link 14 comprises the guiding link body hinged with vehicle frame 1 and is arranged at the sliding extension frame 31 of link body front end of leading, the first half of guiding link body is provided with two guide pegs be parallel to each other, sliding extension frame 31 corresponds to two guide pegs and is provided with two sleeve pipes, sliding extension frame 31 is connected in the front end of the link body that leads by sleeve pipe and guide peg, pneumatic pick seat 25 is fixedly connected on sliding extension frame 31, buffer gear 16 slides and is arranged on sliding extension frame 31, and buffer gear 16 is connected by wire rope with pneumatic pick seat 25.
During work, the piston rod of cylinder 13 stretches out, and by buffer gear 16 driven forward pneumatic pick 22, thus sliding extension frame 31 is stretched, has carried out the adjustment of pneumatic pick 22 position; The piston rod retraction of cylinder 13, buffer gear 16 pulls pneumatic pick seat 25 by wire rope, thus drives sliding extension frame 31 to bounce back, and pneumatic pick 22 is moved down.
Finally should be noted that; above content is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; the simple modification that those of ordinary skill in the art carries out technical scheme of the present invention or equivalently to replace, does not all depart from essence and the scope of technical solution of the present invention.
Claims (10)
1. a down-hole manual safety pinch machine, it is characterized in that: described down-hole manual safety pinch machine comprises vehicle frame, be arranged at the wheel of the first half lower end of vehicle frame, be arranged at the supporting leg of the latter half lower end of vehicle frame, be arranged at the handle of vehicle frame rear end, be articulated with the guiding link of the inclination on vehicle frame, be arranged at the lifting regulating mechanism between vehicle frame and guiding link, be movably set in the pneumatic pick seat on guiding link, be installed on the pneumatic pick on pneumatic pick seat, be articulated with the cylinder of the inclination on vehicle frame, be arranged at the buffer gear between the piston rod of cylinder and pneumatic pick, be arranged at the source of the gas tank on vehicle frame and the pneumatic pick switch operating mechanism for opening pneumatic pick switch, described handle is provided with the handle valve for controlling described cylinder action, described source of the gas tank is connected with the gas port of described cylinder by described handle valve and pipeline, described source of the gas tank is connected by the gas port of pipeline with described pneumatic pick, the operating side of described pneumatic pick switch operating mechanism is arranged on described handle.
2. down-hole according to claim 1 manual safety pinch machine, it is characterized in that: described pneumatic pick switch operating mechanism comprises the junction plate being articulated with handle lower end, be fixedly connected on the brake holding rod of junction plate one end, the articulated elements hinged with the other end of junction plate, be arranged at the switch depression bar of the switch side of described pneumatic pick, the brake cable of arranging along cabling locating part being connected to the multiple cabling locating part on vehicle frame and guiding link and being connected between switch depression bar and articulated elements, middle part and the described pneumatic pick seat of described switch depression bar are hinged, the top of described switch depression bar and the switch of described pneumatic pick touch, the bottom of described switch depression bar is connected with described brake cable, described brake holding rod is the operating side of pneumatic pick switch operating mechanism.
3. down-hole according to claim 2 manual safety pinch machine, it is characterized in that: described brake cable comprises spool, be arranged at the wire in spool and be arranged at the positioning head of head and the tail two ends of spool, two described positioning heads are spacing by corresponding cabling locating part respectively, the head of described wire, it is protruding that rear is each passed through two positioning heads, first section of described wire is fixedly connected with described articulated elements, the rear of described wire is fixedly connected with the bottom of described switch depression bar, back-moving spring is provided with between the bottom of described switch depression bar and described pneumatic pick seat.
4. down-hole according to claim 1 manual safety pinch machine, it is characterized in that: described lifting regulating mechanism is linkage, this linkage comprises sleeve, two adjusting nuts and two screw rods, two rotating spacing upper port and lower port places being connected to described sleeve of described adjusting nut, two described screw rods penetrate in described sleeve from the upper port of described sleeve and lower port respectively, adjusting nut and respective threaded rod are spirally connected, upper end and the described guiding link of a screw rod are hinged, and lower end and the described vehicle frame of another root screw rod are hinged.
5. down-hole according to claim 1 manual safety pinch machine, it is characterized in that: described lifting regulating mechanism is lift adjustment cylinder, lower end and the described vehicle frame of lift adjustment cylinder are hinged, upper end and the described guiding link of the piston rod upwards extended of lift adjustment cylinder are hinged, described handle are provided with the handle valve for controlling the action of described lift adjustment cylinder.
6. according to claim 1, 2, 3, down-hole manual safety pinch machine described in 4 or 5, it is characterized in that: described guiding link comprises the guiding link body hinged with described vehicle frame and is arranged at the sliding extension frame of link body front end of leading, the first half of described guiding link body is provided with two guide pegs be parallel to each other, described sliding extension frame corresponds to two guide pegs and is provided with two sleeve pipes, sliding extension frame is connected in the front end of described guiding link body by sleeve pipe and guide peg, described pneumatic pick seat is fixedly connected on described sliding extension frame, described buffer gear slides and is arranged on described sliding extension frame, described buffer gear is connected by wire rope with described pneumatic pick seat.
7. according to claim 1, 2, 3, down-hole manual safety pinch machine described in 4 or 5, it is characterized in that: described buffer gear comprises mount pad, buffer spring and stripper plate, described mount pad is by base, uprightly be connected to the front end-plate of pan frontward end, what be arranged at front end-plate front end supports head, the end plate and the connecting cylinder be connected between front end-plate and end plate that are uprightly connected to base rear end are formed, described buffer spring is sheathed on described connecting cylinder, through hole is provided with in the middle part of described stripper plate, stripper plate is sheathed on connecting cylinder, and stripper plate is between described buffer spring and described end plate, the rear and front end of described buffer spring supports described front end-plate and described stripper plate respectively, the piston rod of described cylinder is connected with described stripper plate by connector, the described rear end supporting head and described pneumatic pick touches.
8. down-hole according to claim 7 manual safety pinch machine, it is characterized in that: described guiding link is provided with two guide connecting rods be parallel to each other, described base corresponds to these two guide connecting rods and is provided with two gathering sills, and base is coordinated to slide be arranged on described guiding link by gathering sill and guide connecting rod.
9. down-hole according to claim 8 manual safety pinch machine, it is characterized in that: described pneumatic pick seat is provided with two gathering sills corresponding to two guide connecting rods be parallel to each other, described pneumatic pick seat is coordinated to slide be arranged on described guiding link by gathering sill and guide connecting rod, described pneumatic pick seat has been bolted to connection two half-round metal locking belts, described pneumatic pick lock onto between described pneumatic pick seat and two described half-round metal locking belts.
10. down-hole according to claim 9 manual safety pinch machine, it is characterized in that: the lower end of the base of described mount pad and the lower end of described pneumatic pick seat are provided with connection bolt, are connected with wire rope between the connection bolt of base and the connection bolt of pneumatic pick seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510313523.6A CN104989394B (en) | 2015-06-03 | 2015-06-03 | A kind of underground manual safety pinch machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510313523.6A CN104989394B (en) | 2015-06-03 | 2015-06-03 | A kind of underground manual safety pinch machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104989394A true CN104989394A (en) | 2015-10-21 |
| CN104989394B CN104989394B (en) | 2017-06-23 |
Family
ID=54301263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510313523.6A Active CN104989394B (en) | 2015-06-03 | 2015-06-03 | A kind of underground manual safety pinch machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104989394B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030717A (en) * | 2022-06-28 | 2022-09-09 | 长沙矿山研究院有限责任公司 | Ultrasonic induced roof board prying device and using method thereof |
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| US3586113A (en) * | 1969-03-19 | 1971-06-22 | Grant Inc Louis A | Demolition and scooping machine |
| CN201538940U (en) * | 2009-09-21 | 2010-08-04 | 楼其榜 | Intelligent electric pick vehicle |
| CN201990925U (en) * | 2010-12-30 | 2011-09-28 | 文革 | Electric breaker car |
| CN102352751A (en) * | 2011-10-10 | 2012-02-15 | 攀钢集团冶金工程技术有限公司 | Ashlar lifting machine |
| CN102926750A (en) * | 2012-10-11 | 2013-02-13 | 李凯 | Multi-arm breaking excavation-type heading machine |
-
2015
- 2015-06-03 CN CN201510313523.6A patent/CN104989394B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3586113A (en) * | 1969-03-19 | 1971-06-22 | Grant Inc Louis A | Demolition and scooping machine |
| CN201538940U (en) * | 2009-09-21 | 2010-08-04 | 楼其榜 | Intelligent electric pick vehicle |
| CN201990925U (en) * | 2010-12-30 | 2011-09-28 | 文革 | Electric breaker car |
| CN102352751A (en) * | 2011-10-10 | 2012-02-15 | 攀钢集团冶金工程技术有限公司 | Ashlar lifting machine |
| CN102926750A (en) * | 2012-10-11 | 2013-02-13 | 李凯 | Multi-arm breaking excavation-type heading machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030717A (en) * | 2022-06-28 | 2022-09-09 | 长沙矿山研究院有限责任公司 | Ultrasonic induced roof board prying device and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN104989394B (en) | 2017-06-23 |
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