CN114033305A - Drilling equipment is used in mine engineering blasting - Google Patents
Drilling equipment is used in mine engineering blasting Download PDFInfo
- Publication number
- CN114033305A CN114033305A CN202111319774.7A CN202111319774A CN114033305A CN 114033305 A CN114033305 A CN 114033305A CN 202111319774 A CN202111319774 A CN 202111319774A CN 114033305 A CN114033305 A CN 114033305A
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- China
- Prior art keywords
- springs
- drilling device
- base
- rods
- fixed
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/007—Drilling by use of explosives
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
The invention belongs to the technical field of drilling devices, and particularly relates to a drilling device for mine engineering blasting, which comprises a base, wherein two grooves and a mounting groove are formed in the bottom of the base, a square cavity is formed in the base, the mounting groove is positioned between the two grooves, a connecting plate is slidably mounted in the mounting groove along the vertical direction, four corners of the bottom of the connecting plate are rotatably provided with universal wheels, two through holes are formed between the two grooves and the square cavity, vertical rods are movably mounted in the two through holes, the top ends of the two vertical rods are rotatably provided with idler wheels, the bottom ends of the two vertical rods are fixedly provided with buffer blocks, two plastic blocks are fixedly mounted on the inner wall of the top of the square cavity, and two sector gears are rotatably mounted on the inner wall of the bottom of the square cavity. The drilling device for blasting in mine engineering is simple in structure and convenient to use, is convenient to move, is convenient to buffer and absorb shock, and can adjust the angle and the height of a drilled hole.
Description
Technical Field
The invention relates to the technical field of drilling devices, in particular to a drilling device for mine engineering blasting.
Background
When the mine is excavated, blasting means is generally used to blast the ore, so that the ore is convenient to collect. In order to increase the blasting efficiency, it is often necessary to drill a hole in the ore before blasting and then blast the hole. Because mine road conditions are comparatively complicated, generally large-scale punching car can't get into, adopts artifical punching or small-size perforating device to punch usually. Wherein adopt the manual work to punch, efficiency is lower, wastes time and energy moreover, and the hole effect of beating out is also relatively poor, adopts small-size perforating device to punch, because can produce continuous vibrations when punching, these small-size perforating devices can produce the skew under the condition of vibrations to the hole aperture that leads to beating is great, and the effect is relatively poor and to the angle of drilling, highly be not convenient for adjust, needs to improve.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a drilling device for blasting in mine engineering.
In order to achieve the purpose, the invention adopts the following technical scheme:
a drilling device for mine engineering blasting comprises a base, wherein two grooves and mounting grooves are formed in the bottom of the base, a square cavity is formed in the base, the mounting groove is positioned between the two grooves, a connecting plate is slidably mounted in the mounting groove along the vertical direction, universal wheels are rotatably mounted at four corners of the bottom of the connecting plate, two through holes are formed between the two grooves and the square cavity, vertical rods are movably mounted in the two through holes, idler wheels are rotatably mounted at the top ends of the two vertical rods, a buffer block is fixedly mounted at the bottom end of the two vertical rods, two plastic blocks are fixedly mounted on the inner wall of the top of the square cavity, two sector gears are rotatably mounted on the inner wall of the bottom of the square cavity, movable holes are formed in the two plastic blocks, transverse rods are movably mounted in the two movable holes, a connecting block is fixedly mounted at one end, close to each other, a trapezoidal block matched with the idler wheels is fixedly mounted at the other end of the two transverse rods, the top of two sector gear respectively with the linking piece that corresponds between rotate and install the linking pole, the top fixed mounting of base has two fixed plates and top and slidable mounting along the horizontal direction has two racks, and the top of two racks all rotates and installs two festival connecting rods, and the top of two festival connecting rods rotates and installs same fly leaf, the top fixed mounting of fly leaf has the mounting panel, mounting panel top fixed mounting has dead lever and top to rotate and installs the hydraulic press, the top of dead lever rotates with the output shaft of hydraulic press and installs same metal horizontal pole, and the bottom fixed mounting of metal horizontal pole has the motor, and the fixed cover has connect the drill bit on the output shaft of motor.
Preferably, a threaded rod is installed on one side of the base in a threaded mode, a double-sided rack located between the two sector gears is installed at one end of the threaded rod in a rotating mode, a crank is fixedly sleeved at the other end of the threaded rod, and the two double-sided racks are meshed with the sector gears.
Preferably, a plurality of groups of buffer springs are fixedly arranged between the connecting plate and the inner wall of the top of the mounting groove.
Preferably, all cup jointed first spring on two horizontal poles, the one end of two first springs is fixed on the horizontal pole that corresponds, and the other end is fixed on the activity hole inner wall that corresponds.
Preferably, the second springs are sleeved on the two vertical rods, one ends of the two second springs are fixed on the corresponding vertical rods, and the other ends of the two second springs are fixed on the inner walls of the corresponding through holes.
Preferably, all rotate on two fixed plates and install the worm that meshes mutually with the rack that corresponds, the one end that two worms kept away from each other all fixedly cup joints the knob.
Preferably, the sliding groove is formed in one side, close to each other, of each fixing plate in the vertical direction, and the sliding blocks fixedly connected with the movable plate are installed in the sliding grooves in a sliding mode.
Preferably, a handle is fixedly mounted on one side of the base.
According to the invention, the device is moved to a position to be drilled through the universal wheel by the handle, then the crank is rotated to drive the threaded rod to rotate inwards, so that the double-sided rack can be driven to move inwards, the double-sided rack drives the two sector gears to rotate, so that the two connecting rods can be driven to rotate, the two connecting blocks can be driven to move left and right separately by extrusion, so that the two trapezoidal blocks can be driven to move left and right separately, the two trapezoidal blocks respectively extrude the corresponding idler wheels, so that the two vertical rods can be driven to move downwards, so that the two buffer blocks can be driven to move downwards, and the whole device can be braked and buffered by the buffer blocks being in mutual collision with the ground.
The two knobs are rotated to drive the two worms to rotate, so that the two racks can be moved in opposite directions, the two double-section connecting rods can be driven to rotate upwards, the movable plate can be driven to move upwards, the motor can be driven to move upwards, or the two knobs are rotated in opposite directions, so that the motor can be driven to move downwards, and the drilling height can be adjusted.
The hydraulic press is started to drive the metal cross rod to rotate upwards or downwards, so that the angle between the motor and the drill bit can be adjusted, and the drilling angle can be adjusted.
The drilling device for blasting in mine engineering is simple in structure and convenient to use, is convenient to move, is convenient to buffer and absorb shock, and can adjust the angle and the height of a drilled hole.
Drawings
Fig. 1 is a schematic structural diagram of a drilling device for blasting in mine engineering, which is provided by the invention;
fig. 2 is a schematic structural diagram of a part a of the drilling device for blasting in mine engineering, which is provided by the invention;
fig. 3 is a schematic structural diagram of part B of the drilling device for blasting in mining engineering according to the present invention;
fig. 4 is a schematic structural diagram of part C of a drilling device for blasting in mining engineering according to the present invention;
fig. 5 is a partial side view of a drilling device for blasting in mining engineering according to the present invention, with respect to a base.
In the figure: 1 base, 2 square cavities, 3 knobs, 4 grooves, 5 buffer springs, 6 connecting plates, 7 mounting grooves, 8 through holes, 9 handles, 10 worms, 11 two-section connecting rods, 12 fixing plates, 13 fixing rods, 14 hydraulic machines, 15 metal cross rods, 16 mounting plates, 17 motors, 18 drill bits, 19 movable plates, 20 threaded rods, 21 cranks, 22 plastic blocks, 23 cross rods, 24 first springs, 25 trapezoidal blocks, 26 rollers, 27 vertical rods, 28 double-sided racks, 29 connecting rods, 30 sector gears, 31 connecting blocks, 32 second springs, 33 buffer blocks and 34 racks.
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.
Example one
Referring to fig. 1-5, a drilling device for mine engineering blasting comprises a base 1, wherein the bottom of the base 1 is provided with two grooves 4 and a mounting groove 7, the inside of the mounting groove 7 is provided with a square cavity 2, the mounting groove 7 is positioned between the two grooves 4, the inside of the mounting groove is provided with a connecting plate 6 in a sliding manner along the vertical direction, four corners of the bottom of the connecting plate 6 are respectively provided with a universal wheel in a rotating manner, two through holes 8 are respectively formed between the two grooves 4 and the square cavity 2, vertical rods 27 are respectively and movably mounted in the two through holes 8, the top ends of the two vertical rods 27 are respectively and rotatably mounted with a roller 26, the bottom ends of the two vertical rods 27 are respectively and fixedly mounted with a buffer block 33, two plastic blocks 22 are fixedly mounted on the inner wall of the top of the square cavity 2, two sector gears 30 are rotatably mounted on the inner wall of the bottom, movable holes are respectively formed in the two plastic blocks 22, cross rods 23 are respectively and movably mounted in the two movable holes, one end of the two cross rods 23 close to each other is fixedly mounted with a connecting block 31, the other end of the base is fixedly provided with a trapezoidal block 25 matched with the roller 26, the tops of two sector gears 30 are respectively rotatably provided with a connecting rod 29 between the corresponding connecting blocks 31, the top of the base 1 is fixedly provided with two fixed plates 12, the tops of the two fixed plates 12 are slidably provided with two racks 34 along the horizontal direction, the tops of the two racks 34 are rotatably provided with two sections of connecting rods 11, the top ends of the two sections of connecting rods 11 are rotatably provided with the same movable plate 19, the top of the movable plate 19 is fixedly provided with a mounting plate 16, the top of the mounting plate 16 is fixedly provided with a fixed rod 13, the top of the fixed rod 13 is rotatably provided with a hydraulic machine 14, the top end of the fixed rod 13 is rotatably provided with the same metal cross rod 15 together with an output shaft of the hydraulic machine 14, the bottom of the metal cross rod 15 is fixedly provided with a motor 17, and an output shaft of the motor 17 is fixedly sleeved with a drill bit 18.
Example two
In the invention, a threaded rod 20 is installed on one side of a base 1 through threads, a double-sided rack 28 positioned between two sector gears 30 is rotatably installed at one end of the threaded rod 20, a crank 21 is fixedly sleeved at the other end of the threaded rod, the two double-sided racks 28 are mutually meshed with the sector gears 30, the inward rotation of the threaded rod 20 is driven through the rotation of the crank 21, the inward movement of the double-sided racks 28 can be driven, the rotation of the two sector gears 30 is driven by the double-sided racks 28, the rotation of the two connecting rods 29 can be driven, and the left and right separate movement of the two connecting blocks 31 can be driven through extrusion.
According to the invention, a plurality of groups of buffer springs 5 are fixedly arranged between the connecting plate 6 and the inner wall of the top of the mounting groove 7, and the connecting plate 6 can be damped and buffered by the plurality of groups of buffer springs 5, so that the damping of the universal wheel is facilitated.
In the invention, the two cross rods 23 are sleeved with the first springs 24, one ends of the two first springs 24 are fixed on the corresponding cross rods 23, the other ends of the two first springs 24 are fixed on the inner walls of the corresponding movable holes, and the first springs 24 are convenient for the reset of the cross rods 23.
In the invention, the two vertical rods 27 are sleeved with the second springs 32, one ends of the two second springs 32 are fixed on the corresponding vertical rods 27, the other ends of the two second springs 32 are fixed on the inner walls of the corresponding through holes 8, and the second springs 32 are convenient for the vertical rods 27 to reset.
In the invention, the two fixed plates 12 are rotatably provided with the worms 10 engaged with the corresponding racks 34, the mutually far ends of the two worms 10 are fixedly sleeved with the knobs 3, the two knobs 3 are rotated to drive the two worms 10 to rotate, so that the two racks 34 can move oppositely, the two-section connecting rods 11 can be driven to rotate upwards, and the movable plate 19 can be driven to move upwards.
In the invention, sliding grooves are formed in the two sides of the two fixed plates 12 close to each other along the vertical direction, sliding blocks fixedly connected with the movable plate 19 are slidably mounted in the sliding grooves, and the movable plate 19 can be moved conveniently through the sliding grooves and the sliding blocks.
In the invention, a handle 9 is fixedly arranged on one side of the base 1, and the whole device is convenient to push through the handle 9.
EXAMPLE III
Referring to fig. 1-5, a drilling device for mine engineering blasting comprises a base 1, wherein the bottom of the base 1 is provided with two grooves 4 and a mounting groove 7, the inside of the mounting groove 7 is provided with a square cavity 2, the mounting groove 7 is positioned between the two grooves 4, the inside of the mounting groove is provided with a connecting plate 6 in a sliding manner along the vertical direction, four corners of the bottom of the connecting plate 6 are respectively provided with a universal wheel through a bearing in a rotating manner, two through holes 8 are respectively formed between the two grooves 4 and the square cavity 2, vertical rods 27 are movably mounted in the two through holes 8, the top ends of the two vertical rods 27 are respectively provided with a roller 26 through a bearing in a rotating manner, the bottom ends of the two vertical rods 27 are respectively fixedly welded with a buffer block 33, two plastic blocks 22 are fixedly welded on the inner wall of the top of the square cavity 2, two sector gears 30 are rotatably mounted on the inner wall of the bottom through a bearing, movable holes are respectively formed in the two plastic blocks 22, and a cross rod 23 is movably mounted in the two movable holes, the connecting blocks 31 are fixedly welded at one ends of the two cross rods 23 close to each other, the trapezoidal blocks 25 matched with the rollers 26 are fixedly welded at the other ends of the two cross rods 23, the connecting rods 29 are rotatably installed between the tops of the two sector gears 30 and the corresponding connecting blocks 31 through bearings, two fixed plates 12 are fixedly welded at the top of the base 1, two racks 8 are slidably installed at the tops of the two racks 8 along the horizontal direction, two connecting rods 11 are rotatably installed at the tops of the two racks 8 through bearings, the same movable plate 19 is rotatably installed at the top ends of the two connecting rods 11 through bearings, a mounting plate 16 is fixedly welded at the top of the movable plate 19, a fixed rod 13 is fixedly welded at the top of the mounting plate 16, a hydraulic machine 14 is rotatably installed at the top end of the fixed rod 13 and an output shaft of the hydraulic machine 14 through bearings, the same metal cross rod 15 is rotatably installed at the top end of the fixed rod 13 and a motor 17 is fixedly welded at the bottom of the metal cross rod 15, the output shaft of the motor 17 is fixedly sleeved with a drill bit 18.
In the invention, a threaded rod 20 is installed on one side of a base 1 through threads, a double-sided rack 28 positioned between two sector gears 30 is rotatably installed at one end of the threaded rod 20 through a bearing, a crank 21 is fixedly sleeved at the other end of the threaded rod, and the two double-sided racks 28 are both meshed with the sector gears 30.
In the invention, a plurality of groups of buffer springs 5 are fixedly welded between the connecting plate 6 and the inner wall of the top of the mounting groove 7.
In the invention, the two cross rods 23 are sleeved with the first springs 24, one ends of the two first springs 24 are fixed on the corresponding cross rods 23, and the other ends are fixed on the inner walls of the corresponding movable holes.
In the invention, the two vertical rods 27 are sleeved with the second springs 32, one ends of the two second springs 32 are fixed on the corresponding vertical rods 27, and the other ends are fixed on the inner walls of the corresponding through holes 8.
In the invention, the two fixing plates 12 are respectively and rotatably provided with a worm 10 meshed with the corresponding rack 8 through a bearing, and the ends of the two worms 10 far away from each other are respectively and fixedly sleeved with a knob 3.
In the invention, sliding grooves are formed in the two sides of the two fixed plates 12 close to each other along the vertical direction, and sliding blocks fixedly connected with the movable plate 19 are slidably mounted in the sliding grooves.
In the invention, a handle 9 is fixedly welded on one side of the base 1.
According to the invention, the device is firstly moved to a position needing drilling through the universal wheel by the handle 9, then the threaded rod 20 is driven to rotate inwards by rotating the crank 21, so that the double-sided rack 28 can be driven to move inwards, the double-sided rack 28 drives the two sector gears 30 to rotate, so that the two connecting rods 29 can be driven to rotate, the two connecting blocks 31 can be driven to move left and right separately by extrusion, the two trapezoidal blocks 25 can be driven to move left and right separately, the two trapezoidal blocks 25 respectively extrude the corresponding idler wheels 26, so that the two vertical rods 27 can be driven to move downwards, so that the two buffer blocks 33 can be driven to move downwards, and the buffer blocks 33 are mutually abutted with the ground, so that the brake and buffer effects can be achieved on the whole device.
The two knobs 3 are rotated to drive the two worms 10 to rotate, so that the two racks 34 can be moved in opposite directions, the two-section connecting rods 11 can be driven to rotate upwards, the movable plate 19 can be driven to move upwards, the motor 17 can be driven to move upwards, or the two knobs 3 can be rotated in opposite directions, the motor 17 can be driven to move downwards, and the drilling height can be adjusted.
The angle between the motor 17 and the drill bit 18 can be adjusted by starting the hydraulic press 14 to drive the metal cross rod 15 to rotate upwards or downwards, and the drilling angle can be adjusted.
The drilling device for blasting in mine engineering is simple in structure and convenient to use, is convenient to move, is convenient to buffer and absorb shock, and can adjust the angle and the height of a drilled hole.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A drilling device for mine engineering blasting comprises a base (1) and is characterized in that two grooves (4) and a mounting groove (7) are formed in the bottom of the base (1), a square cavity (2) is formed in the base, the mounting groove (7) is located between the two grooves (4), a connecting plate (6) is slidably mounted in the mounting groove along the vertical direction, universal wheels are rotatably mounted at four corners of the bottom of the connecting plate (6), two through holes (8) are formed between the two grooves (4) and the square cavity (2), vertical rods (27) are movably mounted in the two through holes (8), rollers (26) are rotatably mounted at the top ends of the two vertical rods (27), buffer blocks (33) are fixedly mounted at the bottom ends of the two vertical rods (27), two plastic blocks (22) are fixedly mounted on the inner wall of the top of the square cavity (2), and two sector gears (30) are rotatably mounted on the inner wall of the bottom, the two plastic blocks (22) are respectively provided with a movable hole, the two movable holes are respectively and movably provided with a cross rod (23), one end of each cross rod (23) close to each other is fixedly provided with a connecting block (31), the other end of each cross rod is fixedly provided with a trapezoidal block (25) matched with the roller (26), the tops of the two sector gears (30) are respectively and rotatably provided with a connecting rod (29) between the corresponding connecting blocks (31), the top of the base (1) is fixedly provided with two fixed plates (12), the tops of the two fixed plates are provided with two racks (34) in a sliding manner along the horizontal direction, the tops of the two racks (34) are respectively and rotatably provided with two connecting rods (11), the top ends of the two connecting rods (11) are rotatably provided with the same movable plate (19), the top of the movable plate (19) is fixedly provided with a mounting plate (16), the top of the mounting plate (16) is fixedly provided with a fixed rod (13), and the top of the mounting plate (14) is rotatably provided with a hydraulic press, the top end of the fixed rod (13) and the output shaft of the hydraulic machine (14) are rotatably provided with the same metal cross rod (15), the bottom of the metal cross rod (15) is fixedly provided with a motor (17), and the output shaft of the motor (17) is fixedly sleeved with a drill bit (18).
2. The drilling device for blasting in mine engineering according to claim 1, wherein a threaded rod (20) is threadedly mounted on one side of the base (1), a double-sided rack (28) between two sector gears (30) is rotatably mounted on one end of the threaded rod (20), a crank (21) is fixedly sleeved on the other end of the threaded rod, and the two double-sided racks (28) are meshed with the sector gears (30).
3. The drilling device for mine engineering blasting according to claim 1, wherein a plurality of groups of buffer springs (5) are fixedly arranged between the connection plate (6) and the top inner wall of the installation groove (7).
4. The drilling device for mine engineering blasting according to claim 1, wherein the two cross rods (23) are sleeved with first springs (24), one ends of the two first springs (24) are fixed on the corresponding cross rods (23), and the other ends of the two first springs (24) are fixed on the inner walls of the corresponding movable holes.
5. The drilling device for mine engineering blasting according to claim 1, wherein the two vertical rods (27) are sleeved with second springs (32), one end of each of the two second springs (32) is fixed on the corresponding vertical rod (27), and the other end of each of the two second springs is fixed on the inner wall of the corresponding through hole (8).
6. The drilling device for mine engineering blasting according to claim 1, wherein the two fixing plates (12) are rotatably provided with worms (10) engaged with the corresponding racks (34), and the ends of the two worms (10) far away from each other are fixedly sleeved with knobs (3).
7. The drilling device for mine engineering blasting according to claim 1, wherein the two fixed plates (12) are provided with sliding grooves along the vertical direction at the sides close to each other, and sliding blocks fixedly connected with the movable plate (19) are slidably mounted in the sliding grooves.
8. The drilling device for mine engineering blasting according to claim 1, wherein a handle (9) is fixedly mounted on one side of the base (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111319774.7A CN114033305A (en) | 2021-11-09 | 2021-11-09 | Drilling equipment is used in mine engineering blasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111319774.7A CN114033305A (en) | 2021-11-09 | 2021-11-09 | Drilling equipment is used in mine engineering blasting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114033305A true CN114033305A (en) | 2022-02-11 |
Family
ID=80143580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111319774.7A Withdrawn CN114033305A (en) | 2021-11-09 | 2021-11-09 | Drilling equipment is used in mine engineering blasting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114033305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797334A (en) * | 2022-05-06 | 2022-07-29 | 重庆大学 | Construction dust suppression device for environmental protection civil construction engineering |
-
2021
- 2021-11-09 CN CN202111319774.7A patent/CN114033305A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797334A (en) * | 2022-05-06 | 2022-07-29 | 重庆大学 | Construction dust suppression device for environmental protection civil construction engineering |
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Application publication date: 20220211 |
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