CN112761617A - Drilling angle monitoring device and drilling construction method - Google Patents
Drilling angle monitoring device and drilling construction method Download PDFInfo
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- CN112761617A CN112761617A CN202110171413.6A CN202110171413A CN112761617A CN 112761617 A CN112761617 A CN 112761617A CN 202110171413 A CN202110171413 A CN 202110171413A CN 112761617 A CN112761617 A CN 112761617A
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- 238000005553 drilling Methods 0.000 title claims abstract description 92
- 238000012806 monitoring device Methods 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 8
- 230000006978 adaptation Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
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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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling angle monitoring device and a drilling construction method, wherein the drilling angle monitoring device comprises a water braid, a drill rod and a drill provided with a nozzle, the drill rod is arranged between the drill and the water braid and is coaxially and fixedly connected with the drill and the water braid, the drilling angle monitoring device also comprises an angle sensor fixedly connected with the water braid and used for detecting the inclination angle of the nozzle, and an angle display device connected with the angle sensor and used for displaying the angle value detected by the angle sensor. Compare in the direction (angle) of tradition through the drilling of calibrated scale monitoring branch hole, above-mentioned drilling angle monitoring devices not only can monitor the concrete angle in each branch hole, and monitoring accuracy is high moreover, convenient operation to can improve the accuracy in every branch hole drilling position.
Description
Technical Field
The invention relates to the technical field of gas control in underground coal mine areas, in particular to a drilling angle monitoring device. The invention also relates to a drilling construction method.
Background
At present, a dense drilling hole pre-pumping method is mainly adopted in a mine, a large number of cross-layer drill holes need to be drilled from a rock roadway to a coal seam, a female hole is usually constructed first, and then a sub-hole is constructed, wherein the female hole is a pilot hole.
In the prior art, a drilling system comprises a drilling machine, a drill rod, a drill bit, a guider, a support, a water tank, a high-pressure pump, a winch, a propelling mechanism, a dial, a chuck, a high-pressure hose and a self-propelled drill bit. The drilling machine is installed on the support, the drilling rod is connected on the drilling machine, the guider is connected to the front end of the drilling rod, the drill bit is connected to the front end of the guider, the high-pressure pump is connected to the water tank, the high-pressure hose is connected to the high-pressure pump, the high-pressure hose is wound on the winch and penetrates through the propelling mechanism, and the self-advancing drill bit is connected to the front end of the high-pressure hose. The high-pressure hose and the self-propelled drill bit penetrate through the drill rod and are guided by the guider when the sub-holes of the tree-shaped hole are drilled, and the sub-holes are drilled by means of self-propelled force generated by jet flow. A steering dial is arranged on a chuck for connecting a drill rod and the front end of a drilling machine, one end of the dial is fixed on the drill rod and rotates along with the drill rod, the other end of the dial is fixed on the chuck of the drilling machine, and the rotating angle of the guider is controlled through the dial. However, the above-described method of monitoring the rotation angle of the guide by the dial to control the direction (angle) of the branch hole can only measure the angle of each branch hole, cannot measure the specific angle of each branch hole, and has low monitoring accuracy and inconvenient operation.
Therefore, how to avoid the technical problems that in the prior art, only the included angle between the branch holes can be monitored through the dial, the specific angle of each branch hole cannot be measured, the monitoring precision is low, the operation is inconvenient, and the technical problems need to be solved by the technical personnel in the field at present are solved.
Disclosure of Invention
The invention aims to provide a drilling angle monitoring device which not only can monitor the specific angle of each branch hole, but also has high monitoring precision and convenient operation. Another object of the present invention is to provide a drilling construction method.
In order to achieve the above object, the present invention provides a drilling angle monitoring device, which includes a water braid, a drill rod, a drill equipped with a nozzle, a sensor fixedly connected to the water braid for detecting an inclination angle of the nozzle, and an angle display device connected to the sensor for displaying an angle value detected by the sensor.
Optionally, the water swivel includes the casing and locates main shaft in the casing, angle sensor rigid coupling in the main shaft is kept away from the one end of drilling rod.
Optionally, the angle sensor is embodied as an encoder.
Optionally, a sensor housing is provided outside the angle sensor.
Optionally, the sensor housing is nestingly affixed to the housing.
Optionally, a seal is provided between the sensor housing and the angle sensor.
Optionally, the drill rod, the drill and the water swivel are connected by threads, and all the threads have the same angular phase position after being matched.
Optionally, the water pigtail is equipped with first external screw thread, the one end of drilling rod be equipped with the first internal thread of first external screw thread adaptation, the perforator is equipped with the second internal thread, the other end of drilling rod be equipped with the second external screw thread of second internal thread adaptation.
Optionally, the number of the drill rods is at least two, and any two adjacent drill rods are connected through threads.
The invention also provides a drilling construction method, which comprises the following steps:
s1: drilling a main hole through a drill and recording the hole depth of the main hole;
s2: withdrawing the drill rod for a preset distance;
s3: detecting an inclination angle of a nozzle through an angle sensor, adjusting the nozzle to a preset opening position of a branch hole according to an angle value detected by the angle sensor, and drilling the branch hole through the nozzle;
s4: repeating the step of S3 and completing the construction of the multidirectional branch hole with the same depth;
s5: repeating the steps of S2, S3 and S4 after the construction of all branch holes of the previous depth is finished;
s6: and (5) withdrawing the drill after the construction of all branch holes is completed.
Compared with the background art, the drilling angle monitoring device provided by the embodiment of the invention comprises a water swivel, a drill rod and a drill, wherein the drill is provided with a nozzle, the drill rod is arranged between the drill and the water swivel, and the drill rod is coaxially and fixedly connected with the drill and the water swivel; further, drilling angle monitoring devices still includes angle sensor and angle display device, and wherein, angle sensor and water pigtail rigid coupling, angle sensor are used for detecting the angle of inclination of nozzle, and angle display device is connected with angle sensor, and angle display device is used for showing the angle value that angle sensor detected. Meanwhile, the embodiment of the invention also provides a drilling construction method, which comprises the following steps: drilling a main hole through a drill and recording the hole depth of the main hole, withdrawing a drill rod for a preset distance and detecting the inclination angle of a nozzle through an angle sensor, adjusting the nozzle to the hole opening position of a preset branch hole according to the angle value detected by the angle sensor, drilling the branch hole through the nozzle, after the construction of the previous branch hole is finished, repeating the steps of withdrawing the drill rod for the preset distance, detecting the inclination angle of the nozzle through the angle sensor, adjusting the nozzle to the hole opening position of the preset branch hole according to the angle value detected by the angle sensor and drilling the branch hole through the nozzle, and withdrawing the drill after the construction of all the branch holes is finished. Therefore, in the construction process of the branch hole, the inclination angle of the nozzle is accurately detected through the angle sensor, the angle value detected by the angle sensor is displayed in real time through the angle display device, the drill rod is controlled through the drilling machine to achieve regulation and control of the nozzle position, and the nozzle can be adjusted to the opening position of the preset branch hole. Compared with the traditional method for monitoring the drilling direction (angle) of the branch hole through the dial, the drilling angle monitoring device provided by the embodiment of the invention not only can monitor the specific angle of each branch hole, but also has high monitoring precision and convenient operation, thereby improving the accuracy of the drilling direction of each branch hole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a drilling angle monitoring device according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembled structure of an angle sensor and a water braid;
FIG. 3 is a schematic view of the 0 line of the nozzle;
FIG. 4 is a schematic view of another angle nozzle at the 0 line;
FIG. 5 is a schematic view of the internal and external thread start points;
FIG. 6 is a flow chart of a method of drilling according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the distribution of branch holes.
Wherein:
1-water swivel, 11-shell, 12-main shaft, 2-drill rod, 3-drill, 31-nozzle, 4-angle sensor, 41-sensor shell, 42-sealing piece and 5-angle display device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a drilling angle monitoring device, which not only can monitor the specific angle of each branch hole, but also has high monitoring precision and convenient operation. The other core of the invention is to provide a drilling construction method.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the following directional terms such as "upper end, lower end, left side, right side" and the like are defined based on the drawings of the specification.
Referring to fig. 1 to 7, fig. 1 is a schematic structural diagram of a drilling angle monitoring device according to an embodiment of the present invention; FIG. 2 is a schematic view of an assembled structure of an angle sensor and a water braid; FIG. 3 is a schematic view of the 0 line of the nozzle; FIG. 4 is a schematic view of another angle nozzle at the 0 line; FIG. 5 is a schematic view of the internal and external thread start points; FIG. 6 is a flow chart of a method of drilling according to an embodiment of the present invention; FIG. 7 is a schematic diagram of the distribution of branch holes.
As shown in fig. 1 and 2, the drilling angle monitoring device provided by the embodiment of the invention comprises a water braid 1, a drill rod 2 and a drill 3, wherein the drill 3 is provided with a nozzle 31, the drill rod 2 is arranged between the drill 3 and the water braid 1, and the drill rod 2 is coaxially and fixedly connected with the drill 3 and the water braid 1.
Specifically, a drill 3 is provided at the end of the drill pipe 2, the drill 3 being used to crush rock and coal seams, thereby realizing construction of a main hole (pilot hole); the drill rod 2 is arranged on the drilling machine, the drill rod 2 transmits the torque of the drilling machine when a main hole is constructed, and meanwhile, the drill rod 2 plays a role in conveying high-pressure water or low-pressure water, the water swivel 1 is arranged at one end, far away from the drilling device 3, of the drill rod 2, the water swivel 1 is provided with a water inlet, high-pressure water entering from the water inlet flows into a nozzle 31 of the drilling device 3 through the drill rod 2, and after the main hole is constructed, high-pressure water jet flow is formed through the nozzle 31 on the drilling device 3, so that construction of a branch hole.
In order to facilitate the realization to the accurate regulation and control of nozzle 31 on the perforator 3, drilling angle monitoring devices still includes angle sensor 4 and angle display device 5, wherein, angle sensor 4 and 1 rigid coupling of water swivel, angle sensor 4 is used for detecting the angle of inclination of nozzle 31, and angle display device 5 is connected with angle sensor 4, and angle display device 5 is used for showing the angle value that angle sensor 4 detected.
Therefore, the inclination angle of the nozzle 31 is accurately detected through the angle sensor 4, and the angle value detected by the angle sensor 4 is displayed in real time through the angle display device 5, so that the drill rod 2 is controlled to move through the drilling machine to realize the regulation and control of the position of the nozzle 31, and the nozzle 31 can be adjusted to the opening position of the preset branch hole.
Of course, in order to facilitate the positioning of the nozzle 31, the drilling machine further includes a brake device, and when the angle sensor 4 detects that the inclination angle of the nozzle 31 reaches a preset value, that is, at this time, the nozzle 31 is rotated to the opening position of the desired branch hole, the rotation of the drill rod 2 is stopped by the brake device of the drilling machine, so that the nozzle 31 is adjusted to a corresponding position.
Compared with the traditional method for monitoring the drilling direction (angle) of the branch hole through the dial, the drilling angle monitoring device provided by the embodiment of the invention not only can monitor the specific angle of each branch hole, but also has high monitoring precision and convenient operation, thereby improving the accuracy of the drilling direction of each branch hole.
Note that, as shown in fig. 3 and 4, regarding the definition of the inclination angle of the nozzle 31: for example, when the power head of the drilling machine is vertically upward, the axis of the drill rod 2 is along the horizontal direction, the intersection point of the axis of the drill rod 2 and the axis of the power head is taken as a starting point, a line is vertically upward constructed, the line is the 0-degree line of the nozzle 31, the inclination angle of the nozzle 31 is the included angle between the axis of the nozzle 31 at the current position and the 0-degree line of the nozzle 31, and the clockwise direction is positive. Of course, it is preferred herein that the nozzle 31 axis is perpendicular to the axis of the drill rod 2.
It should be noted that the drilling machine itself can also rotate in any direction, the azimuth angle and the inclination angle of the main hole are adjusted by the rotation of the drilling machine, the drill rod 2 (containing the nozzle 31) is driven by the drilling machine (rotating component) to rotate and advance to break rock (coal), the nozzle 31 continuously rotates in the radial direction relative to the axis of the drilling machine, and the inclination angle of the nozzle 31 can be detected in real time through the angle sensor 4.
Of course, according to actual needs, the drill rod 2, the drill 3 and the water braid 1 are connected through threads, and all the threads are screwed together and have the same angular phase position. Specifically, water pigtail 1 is equipped with first external screw thread, and the one end of drilling rod 2 is equipped with the first internal thread with first external screw thread adaptation, and borer 3 is equipped with the second internal thread, and the other end of drilling rod 2 is equipped with the second external screw thread with second internal screw thread adaptation, and the screw thread starting point position of first external screw thread, the screw thread starting point position of first internal screw thread, the screw thread starting point position of second internal screw thread and the screw thread starting point position of second external screw thread all keep unanimous.
In other words, after the drill pipe 2 is matched with the drill 3 and the water swivel 1 through the internal thread and the external thread, the starting points of the threads are the same in angular position relative to the circumference of the drill pipe 2, and the same in angular position of the starting points of the internal thread and the external thread means that the starting points of the internal thread and the external thread are in the same direction relative to the thread axis.
More specifically, as shown in fig. 5, the point of intersection (only one point of intersection of the single thread) of the a-plane and the external thread helix (the highest point of the convex portion) is defined as the external thread starting point, and the point of intersection (only one point of intersection of the single thread) of the b-plane and the internal thread helix (the lowest point of the concave portion) is defined as the internal thread starting point. When the threads are screwed, the ab plane is coincident, and the starting points of the inner threads and the outer threads on the ab plane are coincident. At this time, the starting point positions of the internal and external threads are considered to be consistent.
Of course, even if the starting point positions of the internal and external threads of the drill pipe 2, the drill 3, and the water swivel 1 are not the same, the data processing function of the angle display device 5 corrects the starting point positions to eliminate the deviation between any two angles, and corrects the angles to improve the detection accuracy of the inclination angle of the nozzle 31.
Furthermore, the water braid 1 includes a housing 11 and a main shaft 12 disposed in the housing 11, and the angle sensor 4 is fixedly connected to an end of the main shaft 12 away from the drill rod 2. Of course, the axis of the main shaft 12 is arranged coaxially with the axis of the drill rod 2, and the angle sensor 4 may be connected to the end of the main shaft 12 by a detachable connection (bolt, screw, etc.). Of course, the angle sensor 4 may be specifically configured as an encoder, and the configuration of the encoder may refer to the prior art.
In order to protect the angle sensor 4, a sensor housing 41 is provided outside the angle sensor 4, and the sensor housing 41 is fixedly nested in the housing 11 of the water braid 1. The sensor housing 41 can prevent external dust from entering the angle sensor 4.
Furthermore, a seal 42 is provided between the sensor housing 41 and the angle sensor 4. This sealing member 42 specifically can set up to elastic seal circle, for example the rubber circle, specifically, can set up the ring channel on the inner wall of sensor housing 41 or angle sensor 4's outer wall for the installation rubber circle, the degree of depth of ring channel is less than the radial dimension of rubber circle, so, when the rubber circle adorns in the ring channel, rubber circle protrusion in ring channel, after sensor housing 41 assembles, extrude the rubber circle through sensor housing 41 and angle sensor 4, utilize the elastic deformation of rubber circle to realize sealed function.
Of course, the number of the drill rods 2 may be one or more according to actual needs, and the number of the drill rods 2 is not particularly limited, such as at least two, and any two adjacent drill rods 2 are connected by screw threads. The requirements for thread engagement may be referred to above for engagement between internal and external threads.
The invention also provides a drilling construction method, as shown in fig. 6, comprising:
s1: drilling a main hole through a drill 3 and recording the hole depth of the main hole;
s2: the drill rod 2 is retreated for a preset distance;
s3: detecting the inclination angle of the nozzle 31 through the angle sensor 4, adjusting the nozzle 31 to the opening position of a preset branch hole according to the angle value detected by the angle sensor 4, and drilling the branch hole through the nozzle 31;
s4: repeating the step of S3 and completing the construction of the multidirectional branch hole with the same depth;
s5: repeating the steps of S2, S3 and S4 after the construction of all branch holes of the previous depth is finished;
s6: and (5) withdrawing the drill after the construction of all branch holes is completed.
Specifically, the process of gas drainage drilling construction of a main bore and a plurality of branch bores includes:
1. constructing a main hole and recording the depth of the drilled hole;
2. back drilling to the depth of the 1 st branch hole:
adjusting the inclination angle of the nozzle 31 to the direction of the 11 th branch hole, and constructing the branch hole;
adjusting the inclination angle of the nozzle 31 to the direction of the 12 th branch hole, and constructing the branch hole;
……
adjusting the inclination angle of the nozzle 31 to the direction of the 1N branch hole, and constructing the branch hole;
3. back drilling to the depth of the 2 nd branch hole:
adjusting the inclination angle of the nozzle 31 to the orientation of the 21 st branch hole, and constructing the branch hole;
adjusting the inclination angle of the nozzle 31 to the direction of the 22 th branch hole, and constructing the branch hole;
……
adjusting the inclination angle of the nozzle 31 to the direction of the 2N branch hole, and constructing the branch hole;
……
n +1, back drilling to the depth of the Nth branch hole:
adjusting the inclination angle of the nozzle 31 to the orientation of the Nth branch hole 1 to construct the branch hole;
adjusting the inclination angle of the nozzle 31 to the orientation of the Nth branch hole 2 to construct the branch hole;
……
adjusting the inclination angle of the nozzle 31 to the direction of the NN branch hole, and constructing the branch hole;
n + 2: and (6) withdrawing the drill.
The gas drainage bore hole having one main bore hole and several branch holes, the distribution of which is shown in fig. 7, is completed through the above steps.
Regarding the adjustment of the inclination angle of the nozzle 31, the device can timely detect the angle of the nozzle 31 and stop when the required angle is reached, wherein the rotation speed of the drilling machine is adjustable, and the accurate positioning can be realized by slow rotation and a braking device.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The drilling angle monitoring device and the drilling construction method provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are provided only to help understand the concepts of the present invention and the core concepts thereof. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a drilling angle monitoring devices, its characterized in that includes water swivel (1), drilling rod (2) and is equipped with perforator (3) of nozzle (31), drilling rod (2) are located perforator (3) with between water swivel (1), just drilling rod (2) with perforator (3) with the coaxial rigid coupling of water swivel (1), still include with water swivel (1) rigid coupling, be used for detecting angle sensor (4) at the angle of inclination of nozzle (31) and with angle sensor (4) are connected, are used for showing angle display device (5) of the angle value that angle sensor (4) detected.
2. A drilling angle monitoring device according to claim 1, characterized in that the water swivel (1) comprises a housing (11) and a main shaft (12) arranged in the housing (11), and the angle sensor (4) is fixedly connected to an end of the main shaft (12) remote from the drill pipe (2).
3. Drilling angle monitoring device according to claim 2, characterized in that the angle sensor (4) is embodied as an encoder.
4. Drilling angle monitoring device according to claim 2, characterized in that the angle sensor (4) is externally provided with a sensor housing (41).
5. A drilling angle monitoring device according to claim 4, characterized in that the sensor housing (41) is secured in a nested manner to the housing (11).
6. Drilling angle monitoring device according to claim 5, characterized in that a seal (42) is provided between the sensor housing (41) and the angle sensor (4).
7. A drilling angle monitoring device according to any one of claims 1-6, characterized in that the drill pipe (2) is screwed to both the drill (3) and the water swivel (1) and that all the screws have the same angular phase position when they are engaged.
8. A drilling angle monitoring device according to claim 7, characterized in that the water braid (1) is provided with a first external thread, one end of the drill rod (2) is provided with a first internal thread adapted to the first external thread, the drill (3) is provided with a second internal thread, and the other end of the drill rod (2) is provided with a second external thread adapted to the second internal thread.
9. Drilling angle monitoring device according to claim 8, characterized in that the number of drill rods (2) is provided in at least two, any two adjacent drill rods (2) being connected by means of a thread.
10. A drilling construction method is characterized by comprising the following steps:
s1: drilling a main hole through a drill (3) and recording the hole depth of the main hole;
s2: withdrawing the drill rod (2) for a preset distance;
s3: detecting the inclination angle of a nozzle (31) through an angle sensor (4), adjusting the nozzle (31) to the opening position of a preset branch hole according to the angle value detected by the angle sensor (4), and drilling the branch hole through the nozzle (31);
s4: repeating the step of S3 and completing the construction of the multidirectional branch hole with the same depth;
s5: repeating the steps of S2, S3 and S4 after the construction of all branch holes of the previous depth is finished;
s6: and (5) withdrawing the drill after the construction of all branch holes is completed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118639960A (en) * | 2024-08-13 | 2024-09-13 | 河南省川汇建设工程有限公司 | Road construction drilling device |
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| CN118639960A (en) * | 2024-08-13 | 2024-09-13 | 河南省川汇建设工程有限公司 | Road construction drilling device |
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