CN112727552A - Portable deep hole positioning and marking device and method thereof - Google Patents
Portable deep hole positioning and marking device and method thereof Download PDFInfo
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- CN112727552A CN112727552A CN202110030315.0A CN202110030315A CN112727552A CN 112727552 A CN112727552 A CN 112727552A CN 202110030315 A CN202110030315 A CN 202110030315A CN 112727552 A CN112727552 A CN 112727552A
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- 238000000034 method Methods 0.000 title claims description 23
- 238000005507 spraying Methods 0.000 claims abstract description 38
- 239000003973 paint Substances 0.000 claims abstract description 35
- 239000000126 substance Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- 230000008569 process Effects 0.000 description 8
- 238000005553 drilling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Remote Sensing (AREA)
- Road Repair (AREA)
Abstract
The invention provides a portable deep hole positioning and marking device, which belongs to the technical field of underground mine blasting and comprises a paint spraying unit and a blast hole position adjusting unit; the blast hole position adjusting unit is used for positioning the position of the blast hole according to the depth, the height and the angle of the blast hole to be marked; the paint spraying unit is used for automatically spraying paint and marking the positioned blast hole position; thereby achieving the technical effect of automation of blast hole marking.
Description
Technical Field
The invention relates to the technical field of underground mine blasting, in particular to a portable deep hole positioning and marking device and a method thereof.
Background
In the blasting process of underground mining, a multi-blast hole and multi-row hole blasting technology is often adopted. The blast hole position parameters of blasting such as row spacing, positioning and the like are main factors influencing the blasting effect.
In the prior art, hole site measurement lofting needs to be completed by erecting measuring equipment such as a total station for multiple times for blasting deep hole positioning, and then after a blast hole is projected and positioned on a top plate, constructors use a bamboo pole with a small hairbrush bound at the front end to dip red paint and mark according to the projected positioning. The disadvantages are as follows:
1) the operation process is complicated, and the total station needs to be erected for many times;
2) the method can be completed only by 6 people, so that the labor cost is high and the automation degree is low;
3) the subjective influence of operating personnel is great, takes place deep hole location skew easily, and then influences the blasting effect.
Therefore, a deep hole positioning device for underground mine blasting, which is fast in operation and accurate in positioning, is urgently needed.
Disclosure of Invention
The invention aims to provide a portable deep hole positioning and marking device and a method thereof, which are used for completing automatic and accurate positioning and marking of blast holes by combining a height adjusting module, a depth adjusting module and an angle adjusting module, and achieving the technical effect of simple and rapid operation.
A portable deep hole positioning and marking device comprises a paint spraying unit and a blast hole position adjusting unit; wherein the content of the first and second substances,
the blast hole position adjusting unit is used for positioning the position of the blast hole according to the depth, the height and the angle of the blast hole to be marked;
and the paint spraying unit is used for automatically spraying paint and marking the positioned blast hole position.
Further, preferably, the blast hole position adjusting unit comprises a depth adjusting module, a height adjusting module, an angle adjusting module and a center line aligning rod; wherein the content of the first and second substances,
the height adjusting module comprises a telescopic longitudinal loop bar, the paint spraying unit is arranged at the top end of the longitudinal loop bar, and the angle adjusting module is arranged on the longitudinal loop bar;
the depth adjusting module comprises a telescopic transverse loop bar and is hinged with the height adjusting module;
the middle line aligning rod extends downwards from the hinge joint part of the depth adjusting module and the height adjusting module vertically.
Further, preferably, the angle adjusting module comprises an angle measuring instrument and a conical drogue.
Further, preferably, the longitudinal sleeve rod comprises a longitudinal inner telescopic rod, a longitudinal outer sleeve rod and a longitudinal fixing bolt; the longitudinal inner telescopic rod is telescopically arranged in the longitudinal outer sleeve rod, and a longitudinal fixing bolt for locking the longitudinal inner telescopic rod is arranged on the longitudinal outer sleeve rod.
Further, preferably, the transverse loop bars comprise transverse outer loop bars and transverse inner telescopic bars; and a sliding rail corresponding to the transverse inner telescopic rod is arranged in the transverse outer sleeve rod, and the transverse inner telescopic rod slides relative to the transverse outer sleeve rod along the sliding rail.
Further, preferably, a limiting groove is formed in the top of the longitudinal inner telescopic rod of the longitudinal sleeve rod, and the paint spraying unit is arranged in the limiting groove.
Further, preferably, the paint spraying unit comprises an automatic paint spraying tank, and a spray head is arranged on the automatic paint spraying tank.
The invention also provides a portable deep hole positioning and marking method, which comprises the following steps:
obtaining a central line and a waist line through a laser level according to original coordinate points of the roadway;
aligning a center line alignment rod to the center line, and marking and positioning the position of the blast hole according to the waist line and the depth, height and angle of the blast hole to be marked; wherein, the height of the blast hole to be marked is obtained by adjusting the telescopic longitudinal sleeve rod; the depth of the blast hole to be marked is obtained by adjusting the telescopic transverse loop bar; obtaining the angle of the blast hole to be marked by adjusting the angle adjusting module;
and spraying by a spraying unit to obtain a blast hole mark.
Further, preferably, the angle adjusting module comprises an angle measuring instrument and a conical drogue.
As described above, the portable deep hole positioning and marking device provided by the invention has the technical effects that the height adjusting module, the depth adjusting module and the angle adjusting module are combined to complete automatic positioning and marking of blast holes; the beneficial effects are as follows:
1) the accurate positioning of the hole site of the blast hole is realized by combining the height adjusting module, the depth adjusting module and the angle adjusting module;
2) the blast hole to be marked after positioning is automatically sprayed and marked by using an automatic paint spraying tank, so that the phenomenon of splashing or dripping of paint is avoided;
3) the device is small in size, simple and flexible to operate, is less limited by the terrain, improves the marking efficiency, and has strong practicability.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a portable deep hole positioning and marking device according to an embodiment of the invention;
fig. 2 is a logic schematic diagram of a portable deep hole positioning and marking method according to an embodiment of the invention.
Wherein the content of the first and second substances,
1. a limiting groove; 2. a longitudinal inner telescoping rod; 3. a longitudinal fixing bolt; 4. a longitudinal outer loop bar; 5. an angle measuring instrument; 6. a conical drooping ball; 7. fixing the bolt; 8. a transverse outer loop bar; 9. a transverse inner telescopic rod; 10. a midline alignment rod; 11. automatic paint spraying tank.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
It is to be understood that the terms "aperture", "upper", "lower", "thickness", "top", "middle", "length", "inner", "peripheral", and the like are used merely to facilitate describing the invention and to simplify the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention.
Through adopting the little brush of 1 ~ 2 cun of ligature in bamboo pole one end among the prior art, little brush dips in red paint and marks. The marking process is complicated, the operation is complex, and the paint is easy to drip into the face and eyes of an operator. If constructors abandon the total powerstation because of personnel shortage or inconvenient operation, directly rely on the construction experience to carry out the blast hole position location mark, the mark deviation causes the skew when later stage blast hole drilling, leads to hole bottom distance increase or diminish, influences the blasting effect, what more can cause superblast, root end etc. easily causes incident such as ore depletion, loss, overhang.
In order to solve the problems, improve the operation efficiency and ensure the drilling quality, the invention provides the portable deep hole positioning and marking device, which combines a height adjusting module, a depth adjusting module and an angle adjusting module to complete the technical effect of automatic positioning and marking of blast holes.
Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a general description of the structure of the portable deep hole positioning and marking device. Specifically, fig. 1 is a schematic structural diagram of a portable deep hole positioning and marking device according to an embodiment of the present invention; as shown in figure 1 of the drawings, in which,
a portable deep hole positioning and marking device comprises a paint spraying unit and a blast hole position adjusting unit; the blast hole position adjusting unit is used for positioning the position of the blast hole according to the depth, the height and the angle of the blast hole to be marked; and the paint spraying unit is used for automatically spraying paint and marking the positioned blast hole position. The blast hole position adjusting unit comprises a depth adjusting module, a height adjusting module, an angle adjusting module and a center line aligning rod; the height adjusting module comprises a telescopic longitudinal loop bar, the top end of the longitudinal loop bar is provided with the paint spraying unit, and the longitudinal loop bar is provided with an angle adjusting module; the depth adjusting module comprises a telescopic transverse loop bar and is hinged with the height adjusting module; the center line aligning rod 10 is vertically extended downwards from the hinge joint of the depth adjusting module and the height adjusting module. In a specific implementation process, the depth adjusting module and the height adjusting module are connected and fixed through a fixing bolt 7.
In the process of driving in a roadway engineering, a plurality of drill holes are arranged in the center of a driving working face and are detonated first to form a cavity, and in the implementation process, the arrangement mode, the diameter and the length of different types of drill holes on a driving section are actually determined by specific engineering. Hole array spacing is a significant blasting parameter and is related to regional rock properties, geology, bench height, borehole inclination, explosive spacing used, and other parameters. In the actual drilling arrangement, a working face rock crushing area, a joint development rock concentrated area and a lithologic transition change obvious area need to be reasonably avoided. The position of the deep hole is marked before drilling.
The angle adjustment module comprises an angle measuring instrument 5 and a conical drogue 6. In a particular embodiment, the angle-measuring device 5 comprises a shaft, an angle-measuring pointer, a conical drogue 6, an angle-contrast pointer; the dial plate is provided with scales, the heavy hammer is connected with the angle measuring pointer, the direction pointed by the angle measuring pointer is consistent with that of the heavy hammer all the time, the angle measuring pointer is sleeved on the shaft and can freely rotate around the shaft, one end of the angle comparison pointer is provided with the scales and a magnifying lens arranged on the scales, and the angle comparison pointer is adjusted by the gear set.
The longitudinal loop bar comprises a longitudinal inner telescopic bar 2, a longitudinal outer loop bar 4 and a longitudinal fixing bolt 3; the longitudinal inner telescopic rod 2 is telescopically arranged in the longitudinal outer telescopic rod 4, and a longitudinal fixing bolt 3 for locking the longitudinal inner telescopic rod 2 is arranged on the longitudinal outer telescopic rod 4. The transverse loop bar comprises a transverse outer loop bar 8 and a transverse inner telescopic bar 9; and a sliding rail corresponding to the transverse inner telescopic rod 9 is arranged in the transverse outer sleeve rod 8, and the transverse inner telescopic rod 9 slides relative to the transverse outer sleeve rod 8 along the sliding rail. The top of the longitudinal inner telescopic rod 2 of the longitudinal sleeve rod is provided with a limiting groove 1, and the paint spraying unit is arranged in the limiting groove 1. The paint spraying unit comprises an automatic paint spraying tank 11, and a spray head is arranged on the automatic paint spraying tank.
The spray head of the automatic paint spraying tank 11 is aligned to the position to be marked by aligning the center line aligning rod 10 to the center line for positioning, and then mechanically adjusting the telescopic longitudinal sleeve rod, the telescopic transverse sleeve rod, the angle measuring instrument 5 and the conical drooping ball 6. The blast hole marking can be carried out for multiple times, and the blast hole marking efficiency is greatly improved.
The invention also provides a portable deep hole positioning and marking method.
FIG. 2 shows the logic principle of the portable deep hole positioning and marking method; specifically, fig. 2 is a schematic diagram illustrating a principle of a portable deep hole positioning and marking method according to an embodiment of the present invention; as shown in figure 2 of the drawings, in which,
the portable deep hole positioning and marking method comprises the following steps: steps S110-S130.
S110, obtaining a center line and a waist line through a laser level according to original coordinate points of the roadway;
s120, aligning a center line aligning rod to the center line, and marking and positioning the blast hole according to the waist line and the depth, height and angle of the blast hole to be marked; wherein, the height of the blast hole to be marked is obtained by adjusting the telescopic longitudinal sleeve rod; the depth of the blast hole to be marked is obtained by adjusting the telescopic transverse loop bar; obtaining the angle of the blast hole to be marked by adjusting the angle adjusting module;
and S130, spraying through a spraying unit to obtain a blast hole mark.
Specifically, determining the bearing area and the minimum resisting line of the blast holes, and after determining the positions of the middle line and the waist line, determining the direction of the first-row arranged holes and the position of the first blast hole; and then, according to the hole distribution pitch and the hole distribution row pitch, the portable deep hole positioning and marking device is utilized to carry out hole distribution marking. The occurrence of errors caused by the subjectivity of operators is avoided, and the rapid and accurate hole distribution marking is realized. And determining the drilling depth of the marked blast holes by combining the relative elevation of the blast holes, and then performing drilling operation according to the marks so as to perform blasting operation.
Further, preferably, the angle adjusting module comprises an angle measuring instrument 5 and a conical drogue 6. In a specific implementation process, the measuring instrument may be a mechanical structure or an electric device. In order to further accurately position and mark the effect of the blast hole position, the measuring instrument can comprise a control chip, a battery, a display screen, an operating device, an inclination angle sensor, an electronic compass sensor, a laser ranging sensor, a lens group, a laser transmitter and a laser receiver, wherein the battery, the display screen, the operating device, the inclination angle sensor, the electronic compass sensor and the laser ranging sensor are all connected with the control chip; the laser transmitter and the laser receiver are both connected with the laser ranging sensor and the lens group; the lens group receives the laser emitted by the laser emitter, emits a light beam to the object to be measured, receives the laser returned from the object to be measured, and emits the laser to the laser receiver.
Specifically, in the actual operation process, an automatic paint spraying tank 11 of a spraying unit is firstly placed in a limiting groove 1 of the portable deep hole positioning and marking device, and the height of a blast hole to be marked is obtained by adjusting a longitudinal inner telescopic rod 2 of a telescopic longitudinal loop bar; after the set height is reached, the position of the longitudinal inner telescopic rod can be fixed through the longitudinal fixing bolt. The depth of the blast hole to be marked is obtained by adjusting the transverse inner telescopic rod 9 of the telescopic transverse loop bar; the angle of the blast hole to be marked is obtained by adjusting the angle measuring instrument 5 and the conical drogue 6 of the angle adjusting module. And finally, completing blast hole marking by operating the automatic paint spraying tank 11. According to the method, all marking work can be completed by only three people at most, so that the labor is greatly saved, and the working efficiency of blast hole marking is improved.
In conclusion, the invention relates to a portable deep hole positioning and marking device and a method thereof, which have the advantages of high automation degree, flexible operation, great labor saving and improvement of the working efficiency of blast hole marking.
However, it should be understood by those skilled in the art that various modifications can be made to the portable deep hole positioning and marking device for underground mines provided by the invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (9)
1. A portable deep hole positioning and marking device is characterized by comprising a paint spraying unit and a blast hole position adjusting unit; wherein the content of the first and second substances,
the blast hole position adjusting unit is used for positioning the position of the blast hole according to the depth, the height and the angle of the blast hole to be marked;
and the paint spraying unit is used for automatically spraying paint and marking the positioned blast hole position.
2. The portable deep hole positioning and marking device of claim 1,
the blast hole position adjusting unit comprises a depth adjusting module, a height adjusting module, an angle adjusting module and a center line aligning rod; wherein the content of the first and second substances,
the height adjusting module comprises a telescopic longitudinal loop bar, the paint spraying unit is arranged at the top end of the longitudinal loop bar, and the angle adjusting module is arranged on the longitudinal loop bar;
the depth adjusting module comprises a telescopic transverse loop bar and is hinged with the height adjusting module;
the middle line aligning rod extends downwards from the hinge joint part of the depth adjusting module and the height adjusting module vertically.
3. The portable deep hole positioning and marking device of claim 2,
the angle adjusting module comprises an angle measuring instrument and a conical drooping ball.
4. The portable deep hole positioning and marking device of claim 2,
the longitudinal loop bar comprises a longitudinal inner telescopic bar, a longitudinal outer loop bar and a longitudinal fixing bolt; the longitudinal inner telescopic rod is telescopically arranged in the longitudinal outer sleeve rod, and a longitudinal fixing bolt for locking the longitudinal inner telescopic rod is arranged on the longitudinal outer sleeve rod.
5. The portable deep hole positioning and marking device of claim 2,
the transverse loop bar comprises a transverse outer loop bar and a transverse inner telescopic bar; and a sliding rail corresponding to the transverse inner telescopic rod is arranged in the transverse outer sleeve rod, and the transverse inner telescopic rod slides relative to the transverse outer sleeve rod along the sliding rail.
6. The portable deep hole positioning and marking device according to claim 4, wherein a limiting groove is formed in the top of the telescopic rod in the longitudinal direction of the longitudinal loop bar, and the paint spraying unit is arranged in the limiting groove.
7. The portable deep hole positioning and marking device according to any one of claims 1 to 6, wherein the paint spraying unit comprises an automatic paint spraying tank on which a spray head is provided.
8. A portable deep hole positioning and marking method is characterized by comprising the following steps:
obtaining a central line and a waist line through a laser level according to original coordinate points of the roadway;
aligning a center line alignment rod to the center line, and marking and positioning the position of the blast hole according to the waist line and the depth, height and angle of the blast hole to be marked; wherein, the height of the blast hole to be marked is obtained by adjusting the telescopic longitudinal sleeve rod; the depth of the blast hole to be marked is obtained by adjusting the telescopic transverse loop bar; obtaining the angle of the blast hole to be marked by adjusting the angle adjusting module;
and spraying by a spraying unit to obtain a blast hole mark.
9. The portable deep hole positioning and marking method according to claim 8,
the angle adjusting module comprises an angle measuring instrument and a conical drooping ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030315.0A CN112727552A (en) | 2021-01-11 | 2021-01-11 | Portable deep hole positioning and marking device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110030315.0A CN112727552A (en) | 2021-01-11 | 2021-01-11 | Portable deep hole positioning and marking device and method thereof |
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| CN112727552A true CN112727552A (en) | 2021-04-30 |
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| CN202110030315.0A Pending CN112727552A (en) | 2021-01-11 | 2021-01-11 | Portable deep hole positioning and marking device and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530522A (en) * | 2021-06-29 | 2021-10-22 | 江汉大学 | Demolition blasting blast hole drilling quality testing and accepting device and use method |
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| US5957540A (en) * | 1996-10-21 | 1999-09-28 | Bl-Star Industries Inc. | Blasting positioning device |
| CN103386381A (en) * | 2013-07-22 | 2013-11-13 | 广西大学 | Mining long-distance paint spraying device |
| CN203642814U (en) * | 2014-01-15 | 2014-06-11 | 中国葛洲坝集团国际工程有限公司 | Quick lofting and positioning device for drilling, exploding and hole distributing of tunnel |
| CN205135599U (en) * | 2015-10-29 | 2016-04-06 | 中铁二局集团有限公司 | A big gun dowelling jig advances parameter control device for tunnel smooth blasting |
| CN107843244A (en) * | 2017-11-21 | 2018-03-27 | 贵州大学 | A kind of borehole punching positioner and localization method |
| CN208872187U (en) * | 2018-09-29 | 2019-05-17 | 宝钢集团新疆八一钢铁有限公司 | A kind of auxiliary tool of excavation blasting hole mark |
| CN210268650U (en) * | 2019-08-15 | 2020-04-07 | 中交一公局第四工程有限公司 | Tunnel face eminence laser positioning point paint marking device |
| CN211452353U (en) * | 2019-11-15 | 2020-09-08 | 湖南科技大学 | Scalable folding anchor rope location scale pole |
| CN112031781A (en) * | 2020-08-28 | 2020-12-04 | 青岛市地铁四号线有限公司 | Rotary measuring scale device capable of realizing accurate hole distribution in blasting construction and hole distribution method |
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2021
- 2021-01-11 CN CN202110030315.0A patent/CN112727552A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5957540A (en) * | 1996-10-21 | 1999-09-28 | Bl-Star Industries Inc. | Blasting positioning device |
| CN103386381A (en) * | 2013-07-22 | 2013-11-13 | 广西大学 | Mining long-distance paint spraying device |
| CN203642814U (en) * | 2014-01-15 | 2014-06-11 | 中国葛洲坝集团国际工程有限公司 | Quick lofting and positioning device for drilling, exploding and hole distributing of tunnel |
| CN205135599U (en) * | 2015-10-29 | 2016-04-06 | 中铁二局集团有限公司 | A big gun dowelling jig advances parameter control device for tunnel smooth blasting |
| CN107843244A (en) * | 2017-11-21 | 2018-03-27 | 贵州大学 | A kind of borehole punching positioner and localization method |
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| CN210268650U (en) * | 2019-08-15 | 2020-04-07 | 中交一公局第四工程有限公司 | Tunnel face eminence laser positioning point paint marking device |
| CN211452353U (en) * | 2019-11-15 | 2020-09-08 | 湖南科技大学 | Scalable folding anchor rope location scale pole |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530522A (en) * | 2021-06-29 | 2021-10-22 | 江汉大学 | Demolition blasting blast hole drilling quality testing and accepting device and use method |
| CN113530522B (en) * | 2021-06-29 | 2023-09-12 | 江汉大学 | Demolition blasting blasthole drilling quality acceptance device and use method |
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Application publication date: 20210430 |