CN212614675U - Simple device for measuring inclination angle of drilling hole opening - Google Patents
Simple device for measuring inclination angle of drilling hole opening Download PDFInfo
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- CN212614675U CN212614675U CN202021636578.3U CN202021636578U CN212614675U CN 212614675 U CN212614675 U CN 212614675U CN 202021636578 U CN202021636578 U CN 202021636578U CN 212614675 U CN212614675 U CN 212614675U
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Abstract
The utility model discloses a simple and easy device at survey drilling opening inclination. The device comprises a dial and a transparent ring pipe annularly arranged on the outer side of the dial; the ring pipe is of a hollow tubular structure, a buoy is arranged in the ring pipe, and a gap between the buoy and the ring pipe is filled with filling liquid; the buoy is suspended in the filling liquid and moves along the buoyancy direction, and is used for indicating an angle value corresponding to the inclination angle of the opening of the drill hole. In this way, the utility model discloses can utilize the ascending principle all the time of buoyancy direction, the line that makes the centre of a circle that the ring canal scale corresponds and buoy all keeps perpendicularly with the horizontal plane under arbitrary inclination to regard as this to survey the size at drilling opening inclination. Just the utility model provides a simple and easy device at survey drilling opening inclination simple structure, convenient to carry, easily operation, application scope are wide, can accurately confirm drilling opening inclination angle high-efficiently to satisfy practical application's demand, have higher using value.
Description
Technical Field
The utility model relates to a rock drill trompil angle control technical field especially relates to a simple and easy device at survey drilling opening inclination.
Background
The large-scale drilling equipment with high efficiency, accurate precision and intellectualization often has no more outstanding advantages compared with simple and convenient small-scale drilling equipment due to the limitation of multiple factors such as engineering scale, operating environment and the like. At present, small-sized drilling equipment such as an air-leg rock drill, a small-bore medium-deep hole drilling machine, a deep hole drilling machine and the like are still mainstream drilling equipment with highest use frequency and widest use range in mine engineering and geotechnical engineering.
However, the small-sized drilling equipment is easy to generate deviation of the inclination angle of the drilling opening during the construction process due to the complexity of the construction environment and the defect of self equipment. For example, when an air-leg or rack type rock drill is positioned on a waste rock cushion layer or an inclined roadway floor, a phenomenon of machine center deviation occurs, and at the moment, the drilling angle is difficult to be accurately corrected by using a common angle measuring plate, so that deviation is generated between the opening inclination angle of a drill hole and a design angle, the drilling construction precision is reduced, the effects of subsequent processes such as blasting forming, reinforcing and supporting are influenced, and the comprehensive engineering cost is floated. In addition, the problems of large or small gradient of a step roof and a roadway caused by the deviation of the angle of the peripheral holes during the tunneling process of an underground mine roadway, and the problems of large or small height of a flat roof, empty roof, large or small height of a controlled roof, excessive mining or insufficient mining of a mining width boundary and the like during the stope mining process are all in great association with the angle problem of the inclination angle of the opening of the drill hole. Therefore, the accuracy of the inclination angle of the drilling opening directly influences the square surface of subsequent construction, and the accurate measurement of the inclination angle of the drilling opening has important significance for improving the accuracy of the drilling opening of the small-sized drilling equipment and the overall construction effect.
At present, equipment such as a theodolite, a laser director and the like for measuring the inclination angle of a drilling opening is expensive and complex to operate, and the requirement of actual construction is difficult to meet; the problem of low precision and large error exists when the inclination angle of the opening of the drill hole is measured by using tools such as a suspension wire, a slope gauge and the like. There is still a lack of equipment that can simply and accurately determine the inclination of the borehole opening. To this end, patent publication No. CN109357601A provides a drilling angle measuring device, which controls the direction of a handle by using a circular level bubble on the handle, so that the diameter of a dial placed perpendicular to the handle is maintained in a state perpendicular to the horizontal plane, and further, the angle is read by the scale position corresponding to a measuring rod. However, in actual operation, it is difficult to adjust the circular level bubble to keep the bubble centered all the time, and it is determined whether the bubble is centered with a certain subjective error, which results in an inaccurate measurement result.
In view of the above, there is still a need to provide a simple device for accurately measuring the inclination angle of the borehole opening, so as to solve the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
To the defect that above-mentioned prior art exists, the utility model aims to provide a simple and easy device at survey drilling opening inclination. The circular pipe containing the buoy and filling liquid is arranged on the outer side of the dial, the connecting line of the circle center corresponding to the scales of the circular pipe and the buoy is kept vertical to the horizontal plane at any inclination angle by utilizing the principle that the buoyancy direction is always upward, and the size of the inclination angle of the opening of the drilled hole is measured by taking the connecting line as a reference line; therefore, the problem of angular deviation of small-sized drilling equipment in the drilling construction process is solved, the accuracy of the construction drilling opening is improved, and the operation personnel can accurately perform drilling opening construction according to the designed inclination angle in the construction drawing.
In order to achieve the purpose, the utility model provides a simple device for measuring the inclination angle of a drill hole opening, which comprises a dial and a transparent ring pipe arranged outside the dial; the ring pipe is of a hollow tubular structure, a buoy is arranged in the ring pipe, and a gap between the buoy and the ring pipe is filled with filling liquid; the buoy is suspended in the filling liquid and moves along the buoyancy direction, and is used for indicating an angle value corresponding to the inclination angle of the opening of the drill hole.
Furthermore, the dial comprises a disc body, a cross rod and a ring pipe clamping groove; the tray body is formed by enclosing an arc edge and a straight line edge and is in a semicircular or horseshoe annular structure; the arc-shaped edge is marked with an angle scale value; the straight line extends outwards along the plane where the disc body is located to form the cross rod; the ring pipe clamping grooves are formed in two ends of the cross rod in the length direction and used for fixing the ring pipe.
Further, the angle scale values marked on the arc-shaped edge are increased from 0 degrees of the point positions thereof to 90 degrees along the clockwise direction and the counterclockwise direction respectively.
Furthermore, two ends of the ring pipe are respectively inserted into the ring pipe clamping grooves, and the inner side of the ring pipe is attached to the outer side of the arc-shaped edge.
Furthermore, the ring pipe is uniformly provided with scale marks corresponding to the angle scale values.
Furthermore, the buoy is an ellipsoid body with a cavity and a counterweight inside; the cavity and the balance weight are respectively positioned at two ends of the long axis direction in the buoy, so that the buoy is always in a vertical suspension state in the filling liquid.
Further, the buoy is provided with a colored mark on the outer side of the top part close to the cavity.
Furthermore, the section of the ring pipe is circular; the length of the long shaft of the buoy is less than or equal to three quarters of the section diameter of the ring pipe.
Further, the cross bar can be held by hand or fixed on small-sized drilling equipment; the small-sized drilling equipment is one of an air-leg rock drill, a medium-length hole drilling machine or a deep hole drilling machine.
Further, the filling liquid is one or a mixture of alcohol and ether.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model provides a simple and easy device at survey drilling opening inclination has utilized the ascending principle all the time of buoyancy direction through the ring canal that includes buoy and filling liquid in the outside setting of calibrated scale, can make the line of the centre of a circle that the ring canal scale corresponds all keep perpendicular with the horizontal plane under arbitrary inclination to use this to realize the accurate survey to drilling opening inclination size for the datum line. Use the utility model provides a simple and easy device surveys drilling opening inclination, can compensate small-size drilling equipment because the construction defect that the angular deviation problem leads to in the drilling work progress to improve construction drilling open-ended accuracy, the operating personnel of being convenient for accurately drills the opening construction according to the inclination of design in the construction drawing, and then improves whole construction quality and efficiency.
2. The utility model has the advantages that the filling liquid and the buoy capable of suspending in the filling liquid are arranged in the ring pipe, and the cavity in the ring pipe is completely filled with the filling liquid, so that the buoyancy force applied to the buoy in the filling liquid is kept constant; under the effect of this constant vertical upward buoyancy, the float can float in the filling liquid to the highest point in the loop. And simultaneously, because the utility model discloses in set up the ring canal into the half-circular arc that can laminate mutually with calibrated scale arc limit, can make the peak in the ring canal have the uniqueness to guarantee measuring result's uniqueness. Furthermore, the utility model discloses an add appropriate amount of counter weight in the buoy, can make the buoy remain vertical state throughout in filling liquid to the mark that utilizes the buoy top is accurate to mark corresponding scale, the accurate reading of being convenient for.
3. The utility model provides an among the simple and easy device at survey drilling opening inclination, its horizontal pole both can hand on also can be fixed in small-size drilling equipment, can satisfy the application demand under the different situation, and application scope is wider, has higher using value.
4. The utility model provides a simple and easy device at survey drilling opening inclination simple structure, convenient to carry, and the device design principle is simple and easy understandable, field operation is simple and easy, and operating personnel can utilize the device to confirm drilling opening inclination angle fast to operating personnel accurately drills the opening construction according to the design angle in the construction drawing, and keeps higher detection efficiency when drilling quantity is more. Meanwhile, the device is not interfered by magnetic and electric factors, has low requirements on the use environment, wide application range, low manufacturing cost and accurate detection result, can meet the requirements of actual production and application, and has better application prospect.
Drawings
Fig. 1 is a schematic structural diagram of a simple device for measuring an inclination angle of a borehole opening according to the present invention;
FIG. 2 is a schematic structural diagram of a dial in a simple device for measuring the inclination angle of an opening of a drilled hole according to the present invention;
FIG. 3 is a schematic structural view of a grommet in a simple device for measuring an inclination angle of an opening of a drilled hole according to the present invention;
fig. 4 is a schematic structural diagram of a buoy in a simple device for measuring an inclination angle of a borehole opening according to the present invention at various angles;
FIG. 5 is a schematic structural diagram of a simple device for determining an inclination angle of an opening of a drilled hole according to the present invention when measuring an angle;
FIG. 6 is a schematic structural diagram of a simple device for measuring an inclination angle of a borehole opening provided by the present invention as a handheld device for angle measurement;
fig. 7 is a schematic structural diagram of a simple device for determining the inclination angle of a drill hole opening, which is provided by the utility model and is used as a fixed device for angle measurement on an air-leg rock drill;
FIG. 8 is a schematic structural diagram of a simple device for determining the inclination angle of a drill hole opening provided by the present invention as a fixed device for measuring the angle of a medium-length hole drilling machine or a deep hole drilling machine;
the parts in the drawings are numbered as follows: 100. a simple device for measuring the inclination angle of the opening of the drill hole; 1. a dial scale; 11. a tray body; 12. a cross bar; 13. a ring pipe clamping groove; 2. a ring pipe; 21. scale lines; 3. a float; 31. a cavity; 32. balancing weight; 4. and filling liquid.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 4, the present invention provides a simple device 100 for measuring an inclination angle of a borehole opening, comprising a dial 1 and a transparent ring pipe 2 annularly arranged outside the dial 1; the ring pipe 2 is of a hollow tubular structure, a buoy 3 is arranged in the ring pipe 2, and a gap between the buoy 3 and the ring pipe 2 is filled with filling liquid 4, so that the buoyancy of the buoy 3 in the filling liquid 4 is kept constant; the buoy 3 is suspended in the filling liquid 4 and moves along the buoyancy direction, and is used for indicating an angle value corresponding to the inclination angle of the opening of the drill hole.
The dial 1 comprises a dial body 11, a cross rod 12 and a ring pipe clamping groove 13, and is made of non-transparent plastic materials. In an embodiment of the present invention, the tray body 11 is a semicircular structure surrounded by an arc-shaped edge and a straight edge; in other embodiments of the present invention, the tray body 11 may further be enclosed by an arc edge and a plurality of straight edges to form a horseshoe ring structure.
The arc-shaped edge is marked with an angle scale value which is increased from 0 degrees at the midpoint position of the arc-shaped edge to 90 degrees along the clockwise direction and the anticlockwise direction respectively, and the angle scale value is used for indicating the angle deviated from the middle position.
The straight line edge extends outwards along the plane where the disc body 11 is located to form the cross rod 12, and the cross rod 12 can be held by hands or fixed on small-sized drilling equipment such as an air-leg rock drill, a medium-length hole drilling machine or a deep hole drilling machine, so that the requirement of detecting the inclination angle of a drilling opening under different conditions can be met.
The ring pipe clamping grooves 13 are formed at both ends of the cross bar 12 in the length direction and used for fixing the ring pipe 2.
The ring pipe 2 is made of glass or transparent plastic materials, and the section of the ring pipe is circular; the semi-circular arc formed by the ring pipe 2 is consistent with the arc edge of the disc body 11, the two ends of the ring pipe 2 are respectively inserted into the ring pipe clamping grooves 13, and the inner side of the ring pipe 2 can be attached to the outer side of the arc edge, so that the highest point in the ring pipe is ensured to have uniqueness.
And the ring pipe 2 is uniformly provided with scale marks 21 corresponding to the angle scale values on the disc body 11, so that the buoy 3 in the ring pipe 2 indicates the corresponding scale marks 21. In one embodiment of the present invention, the scale line 21 has a precision of 1 °; the utility model discloses an in other embodiments, this scale mark 21's precision can be adjusted according to actual need, and scale mark 21 can set up more densely, and its measurement accuracy is also higher.
The buoy 3 arranged in the ring pipe 2 is an ellipsoid body with a cavity 31 and a counterweight 32 inside, the cavity 31 and the counterweight 32 are respectively positioned at two ends of the buoy 3 in the long axis direction, and the outer side of the top of the buoy 3 close to the cavity 31 is provided with a colored mark. Under the action of buoyancy and the counterweight 32, the buoy 3 is always in a vertical suspension state with the cavity 31 below the upper counterweight 32 when moving in the filling liquid 4, so that the colored mark on the buoy 3 can be always positioned at the top, and the corresponding scale mark can be accurately indicated. In one embodiment of the invention, the length of the long axis of the buoy 3 is equal to three quarters of the diameter of the section of the loop; in other embodiments of the present invention, the length of the long shaft can be less than three-fourths of the diameter of the cross section of the ring pipe, so that the buoy 3 can smoothly float in the ring pipe 3, and the accuracy of the detection result can be ensured.
In one embodiment of the present invention, the filling liquid 4 is formed by mixing alcohol and ether according to a volume ratio of 1: 1; in other embodiments of the present invention, the filling liquid may also be pure alcohol, pure ether or a mixture of alcohol and ether formed in other proportions. In the above embodiments, the filling liquid 4 has a low viscosity coefficient, which facilitates the float 3 to float and suspend in the filling liquid 4.
The working principle of the simple device 100 for measuring the inclination angle of the drilling hole provided by the present invention is explained below.
Referring to fig. 5, when the simple device 100 for measuring the inclination angle of the drill hole opening provided by the present invention is in use, it is required to keep the cross bar 12 parallel to the central line of the drill hole or drill rod to be measured and to make the loop 2 face upward. At this time, the inclination angle of the cross rod 12 is consistent with the inclination angle of the drilled hole, the buoy 3 in the ring pipe 2 floats in the filling liquid 4 under the action of the vertically upward buoyancy, the highest point in the ring pipe 2 is reached, the connection line between the buoy 3 and the circle center corresponding to the ring pipe 2 is kept perpendicular to the horizontal plane, and the scale value corresponding to the scale line 21 indicated at the mark position at the top end of the buoy is the measured inclination angle of the drilled hole.
Because horizontal pole 12 both can be handheld also can be fixed in on small-size drilling equipment such as air-leg rock drill, medium-length hole drilling machine or deep-hole drilling machine, consequently, the utility model provides a simple and easy device 100 at survey drilling opening inclination both can regard as the hand-held type device to use, also can regard as fixed device to use.
When the utility model provides a pair of simple and easy device 100 at survey drilling opening inclination carries out angle measurement as hand-held device, its schematic structure is shown in fig. 6, and its concrete measuring method is as follows:
after the drill bit of the drill rod is abutted to the position of the opening of the drill hole, a drill rod supporting person holds the cross rod 12 of the simple device 100 for measuring the inclination angle of the opening of the drill hole in parallel with the drill rod, so that the cross rod 12 is kept in parallel with the central line of the drill rod, and the angle corresponding to the buoy is the angle of the inclination angle of the opening of the drill hole.
And comparing the measured angle with the design angle in the construction drawing, if the measured angle is not consistent with the design angle in the construction drawing, adjusting the angle of the opening inclination of the drilling hole by increasing or decreasing the movement or the gas leg of the drilling machine, and repeating the steps to measure the adjusted opening inclination of the drilling hole until the construction inclination angle of the drilling hole is consistent with the design angle of the construction drawing, so that construction can be carried out.
When the utility model provides a pair of simple and easy device 100 at survey drilling opening inclination is as fixed formula device when carrying out angle measurement on the airleg rock drill, its schematic structure is shown in fig. 7, and its concrete measuring method is as follows:
(1) installation: the cross rod 12 of the device keeps parallel to the central line of a drill rod on the air-leg rock drill and is fixedly arranged on the air-leg rock drill;
(2) use of: and observing the scale value corresponding to the scale mark 21 indicated at the mark position at the top end of the buoy 3, namely the inclination angle of the central line of the drill rod propeller of the current drilling machine.
After the angle measurement is completed, the inclination angle of the drill hole opening can be adjusted according to the method for adjusting the inclination angle of the drill hole opening, the detection is repeated until the measured inclination angle is consistent with the design angle in the construction drawing, and then the construction can be carried out.
When the utility model provides a pair of simple and easy device 100 at survey drilling opening inclination carries out angular surveying as fixed formula device on medium-length hole drilling machine or deep hole drilling machine, needs use two the utility model provides a simple and easy device 100 at survey drilling opening inclination, its schematic structure is as shown in FIG. 8, and its concrete measuring method is as follows:
(1) installation: firstly, arranging a drilling machine or a rack on the ground surface by using a level meter to be horizontal, then aligning the drilling machine with the central line, and installing a first simple device 100 for measuring the inclination angle of an opening of a drill hole on a drilling disc in parallel, namely, the drilling machine is arranged at a position close to the center in the figure 8, at the moment, the device is parallel to a rotating surface of the drilling machine, and the indication scale of a buoy is 0 degree and is parallel to the central line of a drill rod of the drilling machine; then, a cross rod 12 of a second simple device 100 for measuring the inclination angle of the opening of the drill hole is arranged near a propeller according to the direction parallel to the center line of the drill rod, so that the cross rod 12 and the drill rod can be linked in angle;
(2) use of: placing the drilling machine according to the ranking requirement, observing the angle value indicated by the buoy 3 in the first simple device 100 for measuring the inclination angle of the opening of the drilled hole, and performing construction correction on the design angle in the construction drawing by using the angle value; and observing the angle value indicated by the buoy 3 in the second simple device 100 for measuring the inclination angle of the drill hole, and adjusting the inclination angle of the drill hole according to the method by taking the corrected angle value as a standard design angle so that the angle value indicated by the buoy 3 in the second simple device 100 for measuring the inclination angle of the drill hole is consistent with the standard design angle value, thereby carrying out construction.
To sum up, the utility model discloses a simple and easy device at survey drilling opening inclination. The device comprises a dial and a transparent ring pipe annularly arranged on the outer side of the dial; the ring pipe is of a hollow tubular structure, a buoy is arranged in the ring pipe, and a gap between the buoy and the ring pipe is filled with filling liquid; the buoy is suspended in the filling liquid and moves along the buoyancy direction, and is used for indicating an angle value corresponding to the inclination angle of the opening of the drill hole. In this way, the utility model discloses can utilize the ascending principle all the time of buoyancy direction, the line that makes the centre of a circle that the ring canal scale corresponds and buoy all keeps perpendicularly with the horizontal plane under arbitrary inclination to regard as this to survey the size at drilling opening inclination. Just the utility model provides a simple and easy device at survey drilling opening inclination simple structure, convenient to carry, easily operation, application scope are wide, can accurately confirm drilling opening inclination angle high-efficiently to satisfy practical application's demand, have higher using value.
The above description is only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the utility model, or the direct or indirect application in other related technical fields, are included in the patent protection scope of the utility model.
Claims (10)
1. The utility model provides a simple and easy device of survey drilling opening inclination which characterized in that: comprises a dial (1) and a transparent ring pipe (2) annularly arranged on the outer side of the dial (1); the ring pipe (2) is of a hollow tubular structure, a buoy (3) is arranged in the ring pipe, and a gap between the buoy (3) and the ring pipe (2) is filled with filling liquid (4); the buoy (3) is suspended in the filling liquid (4) and moves along the buoyancy direction, and is used for indicating an angle value corresponding to the inclination angle of the opening of the drill hole.
2. A simplified apparatus for determining the inclination of a borehole opening according to claim 1, characterised in that: the dial (1) comprises a dial body (11), a cross rod (12) and a ring pipe clamping groove (13); the tray body (11) is formed by enclosing an arc edge and a straight line edge and is in a semicircular or horseshoe annular structure; the arc-shaped edge is marked with an angle scale value; the straight line extends outwards along the plane where the tray body (11) is located to form the cross rod (12); the ring pipe clamping grooves (13) are formed in two ends of the cross rod (12) in the length direction and used for fixing the ring pipe (2).
3. A simplified apparatus for determining the inclination of a borehole opening according to claim 2, characterised in that: the angle scale values marked on the arc-shaped edge are increased to 90 degrees from 0 degree of the point position of the arc-shaped edge along the clockwise direction and the anticlockwise direction respectively.
4. A simplified apparatus for determining the inclination of a borehole opening according to claim 2, characterised in that: two ends of the ring pipe (2) are respectively inserted into the ring pipe clamping grooves (13), and the inner side of the ring pipe (2) is attached to the outer side of the arc-shaped edge.
5. A simplified device for determining the inclination of a borehole opening according to claim 2 or 3, characterised in that: and scale marks (21) corresponding to the angle scale values are uniformly arranged on the ring pipe (2).
6. A simplified apparatus for determining the inclination of a borehole opening according to claim 1, characterised in that: the buoy (3) is an ellipsoid with a cavity (31) and a counterweight (32) inside; the cavity (31) and the counterweight (32) are respectively positioned at two ends of the buoy (3) in the long axis direction, so that the buoy (3) is always in a vertical suspension state in the filling liquid (4).
7. The simplified apparatus for determining the inclination of a borehole opening according to claim 6, wherein: and a colored mark is arranged on the outer side of the top of the buoy (3) close to the cavity (31).
8. The simplified apparatus for determining the inclination of a borehole opening according to claim 6, wherein: the section of the ring pipe (2) is circular; the length of the long axis of the buoy (3) is less than or equal to three-quarters of the diameter of the section of the ring pipe (2).
9. A simplified apparatus for determining the inclination of a borehole opening according to claim 2, characterised in that: the cross rod (12) can be held by hand or fixed on small-sized drilling equipment; the small-sized drilling equipment is one of an air-leg rock drill, a medium-length hole drilling machine or a deep hole drilling machine.
10. A simplified apparatus for determining the inclination of a borehole opening according to claim 1, characterised in that: the filling liquid (4) is one of alcohol and ether.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021636578.3U CN212614675U (en) | 2020-08-06 | 2020-08-06 | Simple device for measuring inclination angle of drilling hole opening |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021636578.3U CN212614675U (en) | 2020-08-06 | 2020-08-06 | Simple device for measuring inclination angle of drilling hole opening |
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| CN212614675U true CN212614675U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878067A (en) * | 2020-08-06 | 2020-11-03 | 长沙矿山研究院有限责任公司 | Simple device for measuring inclination angle of drilling hole opening |
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2020
- 2020-08-06 CN CN202021636578.3U patent/CN212614675U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878067A (en) * | 2020-08-06 | 2020-11-03 | 长沙矿山研究院有限责任公司 | Simple device for measuring inclination angle of drilling hole opening |
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