CN113530481B - Protruding coal seam large-diameter circumference flow supply shield pressure relief sieve mesh drill rod - Google Patents
Protruding coal seam large-diameter circumference flow supply shield pressure relief sieve mesh drill rod Download PDFInfo
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- CN113530481B CN113530481B CN202110903532.6A CN202110903532A CN113530481B CN 113530481 B CN113530481 B CN 113530481B CN 202110903532 A CN202110903532 A CN 202110903532A CN 113530481 B CN113530481 B CN 113530481B
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- drill rod
- flow supply
- pressure relief
- strip
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- 239000003245 coal Substances 0.000 title claims abstract description 42
- 239000002893 slag Substances 0.000 claims abstract description 74
- 238000007599 discharging Methods 0.000 claims abstract description 40
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 239000011148 porous material Substances 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for a protruding coal seam, which comprises an inner pipe and an outer pipe, wherein male buckles and female buckles are respectively arranged at two ends of the inner pipe; a strip seam which penetrates through the inner wall and the outer wall of the outer tube and is matched with the convex rib is arranged between the two end parts of the outer tube; the inner pipe and the outer pipe are coaxially matched to form a large-diameter circumferential flow supply channel; the cross section area of the flow supply channel of the drill rod is large, larger slag discharging power is provided for drilling, the outer diameter of the drill rod can be equal to or close to the diameter of a drill bit, the rod body of the drill rod can play a role in shielding the wall of the drill hole, coal slag produced by the wall of the drill hole enters the inner slag discharging channel through the sieve holes, and the sieve holes have a pressure relief effect on the drill rod; the drill rod can be used for straight drilling or directional drilling of an outstanding coal seam, can relieve the phenomenon of blocking spray holes and excessive hole collapse, and is beneficial to improving the drilling depth and the hole forming quality.
Description
Technical Field
The invention relates to the technical field of coal mine gas extraction drilling, in particular to a large-diameter circumference flow supply shield pressure relief sieve pore drill rod for an outburst coal seam, which is used for the construction of soft outburst coal seam gas extraction drilling with serious hole collapse.
Background
The utility model provides a "outstanding coal seam circumference supplies stream protection hole release sieve mesh drilling rod" of application number or patent number 202110468878.8 of this applicant, the drilling rod body adopts inner tube and outer tube integrated configuration, set up pin thread and box respectively at outer tube both ends, the outer tube is the main load-carrying structure of drilling rod, supply the flow channel that provides the sediment power for the brill is located in the outer tube and outside the inner tube, because the outer tube is the load-carrying main part that is equipped with the screw thread, so outer tube wall thickness is very big, supply flow channel and interior sediment passageway cloth are in the thick wall outer tube, extrude the geometric space that supplies the flow channel, lead to the sectional area of supplying the flow channel to receive very big restriction like this.
The wind flow or the water flow is used as slag discharging power, the size of the slag discharging power is related to the wind pressure and the water pressure and the sectional area of the slag discharging channel, the sectional area of the slag discharging channel is enlarged to directly play a role in enlarging the slag discharging power, and the enlarged slag discharging power is beneficial to the improvement of drilling efficiency and drilling depth, so that the sectional area of the flow supplying channel is of great significance.
Disclosure of Invention
The invention aims to solve the problems, and the invention takes the outer pipe as a bearing main body, takes the inner pipe as a thick-wall bearing main body, and sets screw threads at two ends of the inner pipe, so that the sectional area of a flow supply channel can be increased by times under the condition that the outer diameters of drill rods are the same.
The technical scheme adopted for achieving the purpose is as follows:
the large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for the protruding coal seam comprises an inner pipe and an outer pipe which are installed in a matched mode, the wall thickness of the inner pipe is larger than that of the outer pipe, the inner pipe is of a main bearing structure of the drill rod,
the inner hole of the inner tube is an inner slag discharging channel for discharging slag, a plurality of convex ribs are circumferentially arranged between threads at the end part of the outer surface of the inner tube, and sieve holes communicated with the inner slag discharging channel are formed in the convex ribs;
a strip seam which penetrates through the inner wall and the outer wall of the outer tube and is matched with the convex rib is formed between the two end parts of the outer tube, and the strip seam and the convex rib are matched and installed to form a groove;
the inner pipe and the outer pipe are coaxially matched to form a large-diameter circumferential flow supply channel for providing wind flow or water flow for drilling.
Further, the inner hole of the inner tube is circular, the convex ribs on the outer surface of the inner tube are axial convex ribs or large-pitch convex ribs, and the sieve holes are arranged on the convex ribs and are communicated with the inner slag discharging channel.
Further, the inner hole of the outer tube is circular in shape, and the upper strip seam of the outer tube is an axial strip seam or a large-pitch strip seam.
Further, the width of the convex rib is larger than the width of the strip slit, and the width of the strip slit is larger than the diameter of the sieve holes.
The inner pipe provided with axial convex ribs is embedded and matched with the outer pipe provided with axial strip seams, and an axial groove with sieve holes is formed on the outer surface of the drill rod; the inner pipe provided with the large-pitch convex ribs is embedded and matched with the outer pipe provided with the large-pitch strip seams, and a large-pitch groove with sieve holes is formed on the outer surface of the drill rod.
Further, the matching parts of the convex ribs and the strip seams are welded, the inner tube and the outer tube are welded into a whole, and the strip seams on the outer surface of the flow supply channel and the outer tube are sealed and isolated.
Further, inner holes at two ends of the outer tube are processed to form sealing surfaces, sealing rings are arranged at the sealing surfaces of the adjacent outer tubes, and the flow supply channels at the lap joint positions of the male buckle and the female buckle are annular transition flow supply channels.
Further, in order to meet the cooling requirement of the drill rod, a spiral cooling groove is further formed in the outer wall of the outer tube, a spiral cooling groove is formed in the outer tube with the axial strip seams, coal slag is driven by the spiral cooling groove to move along the spiral groove, and heat is taken away by the coal slag; the outer tube provided with the axial strip seams is provided with the spiral cooling grooves, the spiral cooling grooves also have the function of conveying coal slag, the coal slag in the spiral grooves is conveyed into the axial grooves provided with the sieve holes, so that the coal slag is concentrated to enter the inner slag discharging channels from the sieve holes, the depth of the spiral cooling grooves at the two sides of the axial strip seams can be changed to better exert the slag conveying and collecting effect of the spiral cooling grooves, the depth of the slag inlet side of the spiral cooling grooves is larger than the depth of the slag outlet side, the spiral cooling grooves can be arranged into discontinuous spiral grooves, and the depth of the slag inlet side of the spiral cooling grooves is larger than the depth of the slag outlet side; for the outer tube provided with the large-pitch strip seams, large-pitch cooling grooves connected with the large-pitch strip seams are arranged at two ends of the outer tube; if the hydraulic deslagging is adopted, the cooling tank can be omitted and is also in the protection scope of the invention. The shape of the strip seam can be varied and changed at will, which is within the protection scope of the invention. The inner hole of the outer tube can also be in a shallow groove shape, so that the convex ribs on the outer surface of the inner tube are meshed with the shallow grooves on the inner hole of the outer tube, and the inner tube and the outer tube are matched more firmly, thereby being in the protection scope of the invention. The inner hole of the inner tube is an inner slag discharging channel of the drill rod, the inner slag discharging channel is round, and can also be provided with an axial low convex rib shape or an axial shallow groove shape, and the axial low convex rib or the axial shallow groove can drive coal slag in the inner slag discharging channel to move upwards, so that convenience conditions are provided for slag discharging, and the inner slag discharging channel is also in the protection scope of the invention.
The invention has the beneficial effects that:
1. the existing slag discharging channel of the drill rod is an external slag discharging channel, the external slag discharging channel is easy to be blocked due to hole collapse, and the phenomena of hole drilling blocking and hole spraying caused by hole blocking often occur; the slag discharging channel of the sieve pore drill rod is a circular-diameter inner slag discharging channel of a steel structure, and the inner slag discharging channel is not blocked after the slag particle inlet diameter is controlled.
2. Compared with the drill rod disclosed by the application number or the patent number 202110468878.8 of the applicant, the drill rod disclosed by the applicant has the advantages that the screw threads are arranged on the outer tube of the drill rod, the screw threads are arranged on the inner tube of the drill rod, and the sectional area of the flow supply channel of the drill rod is far larger than that of the drill rod under the condition of the same outer diameter, so that the slag discharge power is increased, and the drilling efficiency and the drilling depth are improved.
3. The drill pipe of application number 202110468878.8 or patent number 202110468878.8 of the applicant only can arrange the slag-discharging sieve holes in an axial groove, and the latter gives more choices than the drill pipe of the invention, and the slag-discharging sieve holes can be arranged in an axial groove or in a spiral groove.
Drawings
FIG. 1 is a diagram showing the overall structure of a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod of an outstanding coal seam;
FIG. 2 is a diagram of the inner pipe of the large-diameter circumferential flow supply shield pressure relief sieve pore drill pipe of the protruding coal seam of the present invention;
FIG. 3 is a diagram of the outer tube of the large-diameter circumferential flow supply shield pressure relief sieve pore drill rod of the protruding coal seam;
FIG. 4 is a view of welding and mesh disposal of the large-diameter circumferential flow supply shield pressure relief mesh drill pipe of the protruding coal seam of the present invention;
FIG. 5 is a seal view of the connection of the large-diameter circumferential flow supply shield pressure relief screen hole drilling rod of the protruding coal seam of the present invention;
FIG. 6 is a view of other matching modes of the inner pipe and the outer pipe of the large-diameter circumferential flow supply shield pressure relief sieve pore drill pipe of the protruding coal seam.
FIG. 7 is a diagram of another arrangement of spiral cooling grooves of a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod of the protruding coal seam of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the large-diameter circumferential flow supply shield pressure relief sieve pore drill rod for the protruding coal seam comprises an inner pipe 1 and an outer pipe 2 which are installed in a matched mode, wherein the wall thickness of the inner pipe 1 is larger than that of the outer pipe 2, the inner pipe 1 is of a main bearing structure of the drill rod, and male buckles and female buckles are respectively arranged at two ends of the inner pipe 1 and are used for connecting two adjacent drill rods; the inner hole of the inner tube 1 is an inner deslagging channel 4 for deslagging, a plurality of convex ribs are circumferentially arranged between two end parts of the outer surface of the inner tube 1, and sieve holes 5 communicated with the inner deslagging channel 4 are formed in the convex ribs.
A strip seam which penetrates through the inner wall and the outer wall of the outer tube 2 and is matched with the convex rib is formed between threads at the upper end part of the outer tube 2, and the strip seam and the convex rib are installed on the outer surface of the drill rod in a matched mode to form a groove; the outer side of the inner pipe 1 is matched with the inner side of the outer pipe 2 to form a large-diameter circumferential flow supply channel 3 for providing wind flow or water flow for drilling. In this embodiment, the width of the ribs is larger than the width of the slits, which is larger than the diameter of the mesh 5. In this scheme, inner tube 1 has two kinds of forms, and outer tube 2 has two kinds of forms, and the inner tube 1 according to two kinds of forms and the outer tube 2 of two kinds of forms correspond the assembly, and the outward appearance form of drilling rod has two kinds: as shown in fig. 1-a, the outer surface of the drill rod is in the form of an axial groove 6 with a sieve hole 5; as shown in fig. 1-b, the outer surface of the drill rod is in the form of a large pitch groove 7 with a screen hole 5.
As shown in fig. 2, the inner hole of the inner tube 1 is circular, and the outer appearance of the inner tube 1 has two types: as shown in fig. 2-a, the outer surface of the inner pipe 1 is provided with a plurality of axial ribs 11, and the axial ribs 11 are provided with sieve holes 5 communicated with the inner slag discharging channel 4; as shown in fig. 2-b, the outer surface of the inner pipe 1 is provided with a plurality of large-pitch ribs 12, and the large-pitch ribs 12 are provided with sieve holes 5 communicated with the inner slag discharging channel 4. The two ends of the inner pipe 1 are respectively provided with a male buckle and a female buckle for connection between two adjacent drill pipes.
As shown in fig. 3, the inner hole of the outer tube 2 is circular, and there are two external forms of the outer tube 2: as shown in fig. 3-a, the outer tube 2 is provided with a plurality of axial slits 21; as shown in fig. 3-b, the outer tube 2 is provided with a plurality of large pitch slits 22. The axial slits 21 and the large pitch slits 22 communicate the outer wall and the inner wall of the outer tube 2.
As shown in fig. 1-3, the inner pipe 1 in fig. 2-a is embedded and matched with the outer pipe 2 in fig. 3-a to form a drill rod in the form of fig. 1-a; the inner tube 1 of fig. 2-b is fitted with the outer tube 2 of fig. 3-b to form the drill rod of the form of fig. 1-b. The width of the axial strip slits 21 is smaller than the width of the axial convex ribs 11 and larger than the diameter of the sieve holes 5, the width of the large-pitch strip slits 22 is smaller than the width of the large-pitch convex ribs 12 and smaller than the diameter of the sieve holes 5, so that after the inner pipe 1 and the outer pipe 2 are embedded, the axial convex ribs 11 can cover the axial strip slits 21 in the outer pipe 2, the large-pitch convex ribs 12 cover the large-pitch strip slits 22 in the outer pipe 2, and the sieve holes 5 are positioned in the middle of the axial strip slits 21 or the large-pitch strip slits 22 and are kept at welding positions.
As shown in fig. 4, the joint of the convex rib and the strip seam adopts a welding seam 13 to weld the inner pipe 1 and the outer pipe 2 into a whole, so that the strip seam of the outer surface of the flow supply channel 3 and the drill rod is sealed and isolated, in order to increase the slag discharging effect of the sieve holes 5, a cambered surface groove or other groove shape is arranged at the position of the sieve holes 5 in the groove of the drill rod, and the slag inlet of the sieve holes 5 is welded or clad with a wear-resistant bulge 14, so that the groove of the drill rod has the slag crushing function, the slag inlet particle diameter of the sieve holes 5 is smaller than the diameter of the sieve holes 5, or a fine steel wire 15 is axially arranged in the middle of the groove to separate the sieve holes 5 so as to control the slag inlet particle diameter of the sieve holes 5 to be smaller than the diameter of the sieve holes 5, and the slag inlet particle diameter of the sieve holes 5 can be smaller than the slag outlet diameter of the sieve holes 5 by adopting methods such as stepped holes and tapered holes. The sieve holes 5 can be obliquely arranged, so that cinder on the outer surface of the drill rod can enter the inner slag discharging channel 4 more easily through the sieve holes 5. In order to prolong the service life of the drill rod, the outer surface of the drill rod can be subjected to wear-resistant treatment by plasma cladding or wear-resistant spraying and other processes.
As shown in fig. 5, the inner holes at two ends of the outer tube 2 are respectively processed with sealing surfaces, sealing rings 8 are installed at the sealing surfaces of the adjacent outer tubes 2, and the flow supply channels 3 at the joint of the pin and the box are annular transition flow supply channels 9.
In order to reduce the temperature of the drill pipe, a spiral cooling groove is formed in the outer wall of the outer tube 2, a spiral cooling groove 23 is formed in the outer tube provided with the axial strip slit 21, the spiral cooling groove 23 drives coal slag to move along the spiral groove, the coal slag takes away heat, the spiral cooling groove 23 also has the function of conveying the coal slag, the coal slag in the spiral cooling groove 23 is conveyed into the axial groove 21 provided with the sieve holes 5, so that the coal slag intensively enters the inner slag discharging channel 4 from the sieve holes 5, the depth of the spiral cooling grooves 23 on two sides of the axial strip slit 21 can be changed to better exert the slag conveying and gathering effect of the spiral cooling groove 23, and the slag inlet side depth of the spiral cooling groove 23 is larger than the slag discharging side depth; for the outer tube provided with the large-pitch strip slit 22, large-pitch spiral cooling grooves 23 connected with the large-pitch strip slit 22 are arranged at two ends of the outer tube 2; if the hydraulic slag discharge is adopted, the spiral cooling groove 23 can be omitted, and the protection scope of the invention is also provided. The shape of the strip seam can be varied and changed at will, which is within the protection scope of the invention. The shape of the inner hole of the outer tube 2 can also be a shallow groove, so that the convex ribs on the outer surface of the inner tube 1 are meshed with the shallow groove on the inner hole of the outer tube 2, and the inner tube and the outer tube are matched more firmly, and the invention is also within the protection scope.
As shown in FIG. 6, the inner tube 1 and the outer tube 2 have various morphological structures and installation and matching methods, including the concave-convex meshing installation of the inner tube 1 and the outer tube 2 with concave-convex tooth-shaped inner holes, so that the matching of the inner tube 1 and the outer tube 2 is stronger, as shown in FIG. 6-a; the inner hole of the outer tube 2 is in the shape of an inner convex rib, the outer surface of the inner tube 1 is in the shape of a circle, and as shown in fig. 6-b, the cross section of the groove of the outer tube is in the shape of an arc surface or other shapes. With the development of the processing technology of steel pipes, the inner pipe 1 and the outer pipe 2 can be processed into a whole, as shown in fig. 6-c, and the outer surface of the inner pipe is provided with a circular arc or other shapes with the cross section of the groove.
As shown in fig. 6, in order to make the inner slag discharging channel have the function of lifting the coal slag, the inner hole of the inner tube may be in a shape with an axially low convex rib or an axially shallow groove, and the axially low convex rib or the axially shallow groove may drive the coal slag in the inner slag discharging channel to move upwards, as shown in fig. 6-d, as shown in fig. 6-e and as shown in fig. 6-f.
As shown in fig. 7, a spiral cooling groove 23 is formed on the outer tube 2 provided with the axial slits 21, the spiral cooling groove 23 also has the function of conveying coal slag, the coal slag in the spiral cooling groove 23 is conveyed into the axial grooves 6 provided with the sieve holes 5, so that the coal slag intensively enters the inner slag discharging channel 4 from the sieve holes 5, and the spiral cooling groove 23 can be formed into a discontinuous spiral groove for better playing the function of the spiral cooling groove 23; in order to make less coal slag entering the axial groove 6 enter the spiral cooling groove 23 again, the spiral cooling groove 23 can be subjected to groove changing deep treatment, so that the slag entering side depth of the spiral cooling groove 23 is larger than the slag discharging side depth.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model relates to a large-diameter circumferential flow supply shield pressure relief sieve pore drill rod of an extruded coal seam, which is characterized by comprising an inner pipe and an outer pipe which are arranged in a matched manner, wherein the wall thickness of the inner pipe is larger than that of the outer pipe, the inner pipe is a main bearing structure of the drill rod,
the inner hole of the inner tube is an inner slag discharging channel for discharging slag, a plurality of convex ribs are circumferentially arranged between threads at the end part of the outer surface of the inner tube, and sieve holes communicated with the inner slag discharging channel are formed in the convex ribs;
a strip seam which penetrates through the inner wall and the outer wall of the outer tube and is matched with the convex rib is formed between the two end parts of the outer tube, and the strip seam and the convex rib are matched and installed to form a groove;
the outer side of the inner pipe is coaxially matched with the inner side of the outer pipe to form a large-diameter circumferential flow supply channel for providing wind flow or water flow for drilling;
arc surface grooves or grooves with other shapes are formed in positions where the sieve holes are formed, and wear-resistant protrusions are welded or clad at slag inlets of the sieve holes;
the joint of the convex rib and the strip seam is welded, the inner tube and the outer tube are welded into a whole, and the strip seam on the outer surface of the flow supply channel and the outer tube is sealed and isolated;
the inner holes at two ends of the outer tube are processed to form sealing surfaces, sealing rings are arranged at the sealing surfaces of the adjacent outer tubes, and the flow supply channels at the joint of the male buckle and the female buckle are annular transition flow supply channels.
2. The drill pipe with the large-diameter circumferential flow supply shield pressure relief sieve holes for protruding coal seams according to claim 1, wherein the inner hole of the inner pipe is circular, the convex ribs on the outer surface of the inner pipe are axial convex ribs or large-pitch convex ribs, and the sieve holes are arranged on the convex ribs and are communicated with the inner slag discharging channel.
3. The protruding coal seam large-diameter circumferential flow supply shield pressure relief sieve pore drill pipe according to claim 2, wherein the inner hole of the outer pipe is circular in shape, and the upper strip seam of the outer pipe is an axial strip seam or a large-pitch strip seam.
4. A protruding coal seam large-diameter circumferential flow supply shield pressure relief screen hole drill pipe as claimed in claim 3, wherein the width of the ribs is greater than the width of the slits, and the width of the slits is greater than the diameter of the screen holes.
5. The drill rod with the large-drift diameter circumferential flow supply shield pressure relief sieve holes for the protruding coal seam according to claim 4, wherein the inner pipe provided with the axial convex ribs is embedded and matched with the outer pipe provided with the axial strip slits, and an axial groove with sieve holes is formed on the outer surface of the drill rod; the inner pipe provided with the large-pitch convex ribs is embedded and matched with the outer pipe provided with the large-pitch strip seams, and a large-pitch groove with sieve holes is formed on the outer surface of the drill rod.
6. The drill rod for the large-diameter circumferential flow supply shield pressure relief sieve holes of the protruding coal seam according to any one of claims 1 to 5, wherein a spiral cooling groove is further formed in the outer wall of the outer pipe.
7. The protruding coal seam large-diameter circumferential flow supply shield pressure relief sieve pore drill pipe of claim 6, wherein the spiral cooling groove on the outer wall of the outer pipe of the large-pitch strip slit is a large-pitch cooling groove connected with the large-pitch strip slit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110777347 | 2021-07-09 | ||
| CN2021107773477 | 2021-07-09 |
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| CN113530481A CN113530481A (en) | 2021-10-22 |
| CN113530481B true CN113530481B (en) | 2024-01-09 |
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| CN202110903532.6A Active CN113530481B (en) | 2021-07-09 | 2021-08-06 | Protruding coal seam large-diameter circumference flow supply shield pressure relief sieve mesh drill rod |
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