CN111005689B - Centralizer suitable for colliery is drilling usefulness in pit - Google Patents
Centralizer suitable for colliery is drilling usefulness in pit Download PDFInfo
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- CN111005689B CN111005689B CN201911324325.4A CN201911324325A CN111005689B CN 111005689 B CN111005689 B CN 111005689B CN 201911324325 A CN201911324325 A CN 201911324325A CN 111005689 B CN111005689 B CN 111005689B
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- 238000005553 drilling Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims description 21
- 239000000956 alloy Substances 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000011664 nicotinic acid Substances 0.000 claims description 8
- 238000004372 laser cladding Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 208000016261 weight loss Diseases 0.000 claims 1
- 239000013585 weight reducing agent Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241000238557 Decapoda Species 0.000 description 1
- 241000283966 Pholidota <mammal> Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a centralizer suitable for underground drilling of a coal mine, which comprises two semi-cylindrical centralizing bodies, and a hinge member and a fastener which are used for connecting the two centralizing bodies; the righting body comprises a first semicircular plate body, a second semicircular plate body and a supporting rib plate, the second semicircular plate body is arranged on the inner ring of the first semicircular plate body, and two sides of the first semicircular plate body are connected with two sides of the second semicircular plate body through the supporting rib plate respectively; one ends of the two centralizing bodies are hinged together through a hinged part, and the two centralizing bodies can rotate around the hinged part of the two centralizing bodies and the hinged part; the other ends of the two centralizing bodies are fixed through a fastener, so that the two second semicircular plate bodies form a circular profile for inserting the drill rod. The centralizer and the drill rod can be screwed and disassembled, so that the installation and the disassembly of the large-diameter centralizer are greatly facilitated, the drilling efficiency is improved, and the effects of hole forming, inclination stabilization and centralization are achieved.
Description
Technical Field
The invention belongs to the technical field of underground drilling engineering of a coal mine, and particularly relates to a centralizer suitable for underground drilling of the coal mine.
Background
With the progress of the underground coal mine gas extraction technology, particularly the popularization of the technology of replacing roadways with holes, the large-diameter drill holes for underground coal mine construction are more and more. Compared with the conventional small-diameter drilling, the annular space between the drill rod and the hole wall of the large-diameter hole is increased, and the actual track of the drilled hole is easy to deviate from the designed track. Centralizers are therefore usually inserted between the drill rods to reduce the inclination of the borehole. However, the outer diameter of centralizers used for large diameter bore holes to ensure centralizing effect tends to be larger, with a concomitant increase in weight.
When large-diameter drilling holes are drilled under coal mines, particularly during composite drilling, due to the fact that the weight of a centralizer and a drill string is increased, pressure on the hole wall is increased, mud and rock debris generated in the drilling process cannot be discharged and are attached to an outer cylinder of the centralizer, friction resistance of a mud bag is increased, and the like, and the friction resistance between the centralizer and the hole wall is often large. The larger frictional resistance not only easily causes the transition wear or the eccentric wear of the centralizer, influences the service life of the centralizer, but also leads to the drill pressure of the drill bit to be obviously reduced. More importantly, the conventional centralizer for underground drilling of the existing coal mine is mostly integrated, and can not be connected from the rear end of the clamp holder in a normal drill rod connection mode during drilling, and can only be connected with a drill rod in a hole at the front end of the clamp holder and then screwed and fed by a drilling machine. When the drill is started, in order to prevent the connection between the drill rods in the hole from being loosened, the conventional integrated centralizer and other drill rods cannot be loosened by the aid of a drilling machine, and the centralizer can only be manually loosened and connected with other drill rods at the front end of the clamp holder. The process has low construction efficiency and consumes time and labor.
Disclosure of Invention
In order to solve the problems, the invention provides a centralizer suitable for large-diameter drilling in a coal mine well, and solves the problems that the existing centralizer is of an integrated structure, is inconvenient to assemble and disassemble with a drill rod and is poor in wear resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
a centralizer suitable for underground drilling of a coal mine comprises two semi-cylindrical centralizing bodies, and an articulated piece and a fastener which are used for connecting the two centralizing bodies;
the righting body comprises a first semicircular plate body, a second semicircular plate body and a supporting rib plate, the diameter of the first semicircular plate body is larger than that of the second semicircular plate body, and the inner diameter of the second semicircular plate body is matched with the diameter of the drill rod; the second semicircular plate body is arranged on the inner ring of the first semicircular plate body, and two sides of the first semicircular plate body are respectively connected with two sides of the second semicircular plate body through supporting rib plates;
the one end of two right the body pass through the articulated elements articulate together, and two right the body all can rotate around its articulated department with the articulated elements, the axis direction of the first semi-circular plate body of direction of rotation perpendicular to, the other end of two right the body passes through the fastener fixed for two second semi-circular plate body form and supply the circular profile that the drilling rod inserted.
Furthermore, a torque transmission key is arranged on the inner wall of the second semicircular plate body, a key groove is correspondingly arranged on the drill rod, and the size of the key groove is matched with that of the torque transmission key.
Preferably, the length of the first semicircular plate body along the axial direction of the centralizing body is smaller than the length of the second semicircular plate body along the axial direction of the centralizing body.
Specifically, the supporting rib plate is a trapezoidal plate body, the short side of the trapezoidal plate body is connected with the inner wall of the first semicircular plate body, and the long side of the trapezoidal plate body is connected with the outer wall of the second semicircular plate body; first hard alloy cutting blocks are arranged on two side edges of the trapezoidal plate body.
Specifically, the hinge element comprises a first hinge seat, a second hinge seat and a first pin shaft, wherein the first hinge seat and the second hinge seat are respectively provided with a first through hole for the first pin shaft to be inserted into, and the first hinge seat and the second hinge seat can rotate around the first pin shaft; the first hinged seat is fixed on a supporting rib plate of one righting body, the second hinged seat is fixed on a supporting rib plate of the other righting body, and the axial direction of the first pin shaft is the same as that of the righting body.
Specifically, the fastener include second round pin axle and fixation nut, all be provided with the second through-hole that supplies second round pin axle to pass on the support floor of two centralizing bodies.
Furthermore, a second hard alloy cutting block is arranged on the outer wall of the first semicircular plate body, and the second hard alloy cutting blocks are in a strip shape and are axially distributed along the outer wall of the first semicircular plate body; the outer wall of the first semicircular plate body is provided with bionic structure protrusions of iron-based mixed Co/WC alloy powder by adopting a laser cladding technology.
Furthermore, the first semicircular plate body and the support rib plate are both provided with a weight-reducing deslagging hole.
Preferably, the weight-reducing deslagging holes in the first semicircular plate body are spirally arranged around the first semicircular plate body, and the helix angle is 15-45 degrees.
Furthermore, the first semicircular plate body, the second semicircular plate body and the two supporting rib plates are connected to form a semicircular cavity, and a plurality of supporting rib plates are uniformly arranged in the semicircular cavity along the circumferential direction of the first semicircular plate body.
Compared with the prior art, the invention has the beneficial effects that:
the centralizer is formed by hinging two semi-cylindrical centralizing bodies, so that the centralizer and a drill rod can be screwed and disassembled, the centralizer is greatly convenient to mount and dismount, the drilling efficiency is improved, and the effects of hole forming, inclination stabilization and centralization are achieved; the centralizer is compact and reliable in structure, the maximum torque, the pulling force, the shearing force and the like of the drill rod, the hinge piece, the fastener and the like in the stress analysis center are in a safe range, the centralizer is high in reliability when used underground in a coal mine, and is suitable for popularization.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is an overall structural view of the centralizer of the present invention.
FIG. 2 is a cross-sectional view A-A of the centralizer of the present invention.
FIG. 3 is a cross-sectional view B-B of the centralizer of the present invention.
Fig. 4 is a schematic view of the construction of the drill rod of the present invention.
The reference numerals in the figures denote:
1-a righting body, 2-a hinged part, 3-a fastening piece, 4-a torque transmission key, 5-a first hard alloy cutting block, 6-a second hard alloy cutting block and 7-a drill rod;
101-a first semicircular plate body, 102-a second semicircular plate body, 103-a supporting rib plate and 104-a weight-reducing deslagging hole;
201-a first hinge seat, 202-a second hinge seat, 203-a first pin;
301-a second pin shaft, 302-a fixing nut;
701-keyway.
The details of the present invention are explained in further detail below with reference to the drawings and the detailed description.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
In the present invention, unless otherwise specified, the use of the terms of orientation such as "upper, lower and bottom" generally means defined with reference to the drawing plane of the corresponding drawing, and "inner and outer" means defined with reference to the outline of the corresponding drawing.
As shown in figure 1, the invention discloses a centralizer suitable for underground drilling of a coal mine, which comprises two semi-cylindrical centralizing bodies 1, a hinge part 2 for connecting the two centralizing bodies 1 and a fastener 3.
The righting body 1 comprises a first semicircular plate body 101, a second semicircular plate body 102 and a supporting rib plate 103, wherein the diameter of the first semicircular plate body 101 is larger than that of the second semicircular plate body 102. The second semicircular plate 102 is arranged at the inner ring of the first semicircular plate 101, and two sides of the first semicircular plate 101 are respectively connected with two sides of the second semicircular plate 102 through supporting ribs 103. One end of each of the two centralizing bodies 1 is hinged together through a hinge part 2, the two centralizing bodies 1 can rotate around the hinged positions of the two centralizing bodies and the hinge parts 2, the rotating direction is perpendicular to the axis direction of the first semicircular plate body 101, and the other ends of the two centralizing bodies 1 are fixed through a fastener 3, so that the two second semicircular plate bodies 102 form a circular profile for inserting the drill rod 7. The inner diameter of the second semicircular plates 102 matches the diameter of the drill rod 7, so that the drill rod 7 can be inserted into the circular profile formed by the two second semicircular plates 102; the diameter of a circular outline formed by the two first semicircular plate bodies 101 is smaller than the diameter of a drilled hole by 20-35 mm.
When the centralizer disclosed by the invention is used for underground operation, the drilling machine clamp holder and the slips can be used for screwing or unscrewing the center rod and the front and rear drill rods, the two centralizing bodies 1 are hinged by the hinge piece 2, and then the two centralizing bodies 1 are fastened or loosened on the center rod in front of the clamp holder, so that the labor intensity of workers is reduced, and the loading and unloading time is also shortened.
In the centralizer, the first semicircular plate body 101 and the second semicircular plate body 102 are connected with the two supporting rib plates 103 to form a semicircular cavity, and in order to increase the connection rigidity between the first semicircular plate body 101 and the second semicircular plate body 102, a plurality of supporting rib plates 103 are uniformly arranged in the semicircular cavity along the circumferential direction of the first semicircular plate body 101, as shown in fig. 2, so that the centralizer is more compact and reliable in structure. The specific number of the supporting rib plates 103 can be determined according to the stress analysis of the centralizer under the actual working condition.
As shown in fig. 2, in an embodiment of the present invention, the hinge member 2 includes a first hinge seat 201, a second hinge seat 202, and a first pin 203, the first hinge seat 201 and the second hinge seat 202 are respectively provided with a first through hole (not labeled) for inserting the first pin 203, and both the first hinge seat 201 and the second hinge seat 202 can rotate around the first pin 203; the first hinged seat 201 is fixed on the supporting rib plate 103 of one righting body, the second hinged seat 202 is fixed on the supporting rib plate 103 of the other righting body, and specifically, the first hinged seat 201 and the second hinged seat 202 are fixed on the supporting rib plate 103 in a welding mode. The axial direction of the first pin shaft 203 is the same as the axial direction of the centralizing body 1. Specifically, in order to realize stable rotation, a first hinged seat 201 and a second hinged seat 202 are fixed to the upper half portion of the supporting rib plate 103, a first hinged seat 201 and a second hinged seat 202 are also fixed to the lower half portion of the supporting rib plate 103, the first pin shaft 203 is a screw rod, and the screw rod penetrates through the four hinged seats and then is fixed through nuts to form a hinge structure.
As shown in fig. 3, in an embodiment of the present invention, the fastening member 3 includes a second pin 301 and a fixing nut 302, the second pin 301 is a screw, and the supporting rib plates 103 of the two centralizers are both provided with second through holes (not shown) for the second pin 301 to pass through. The upper half part and the lower half part of the supporting ribbed plate 103 are both provided with a second through hole, and the positions of the second through holes on the same side of the two supporting ribbed plates 103 correspond.
In order to better realize the tight connection between the drill rod center rod and the centralizer, a torque transmission key 4 is arranged on the inner wall of the second semicircular plate body 102, and a key slot 701 is correspondingly arranged on the drill rod 7, as shown in fig. 4, the size of the key slot 701 is matched with that of the torque transmission key 4. In the embodiment of the present invention, the torque transmission key 4 is a square plate fixed on the inner wall of the second semicircular plate 102. When the drill rod is installed, the torque transmission key 4 is correspondingly attached to the corresponding key groove of the drill rod; two torque transmission keys 4 are arranged on the inner wall of each second semicircular plate body 102. When the centralizer is installed, the two centralizing bodies 1 are hinged by the hinge piece 2, and the two centralizing bodies 1 which are hinged are concentric with the central rod in front of the clamp holder, and the torque transmission key 4 is correspondingly attached to the corresponding key groove 701 of the central rod. Finally, the two centralizers 1 are fastened. When the drill is lifted and the centralizer is disassembled, the centralizer 1 can be disassembled from the center rod by disassembling the fasteners 3 of the two centralizers 1 between the clamper and the hole, and the center rod 14 can be disassembled by the clamper and the slips.
As a preferable scheme of the invention, the centralizer of the invention is used for large-diameter drilling, and the whole centralizer is large, so the first semicircular plate body 101 and the supporting rib plate 103 are both provided with the weight-reducing deslagging holes 104, so that deslagging is realized on one hand, and weight is reduced on the other hand. The shape of the weight-reducing deslagging hole 104 can be round, rectangular and the like. More preferably, the weight-reducing deslagging holes 104 on the first semicircular plate body 101 are spirally arranged around the first semicircular plate body 101, and the spiral angle is 15-45 degrees.
As a preferred solution of the invention, the length of the first semicircular plate 101 in the axial direction of the centralizing body 1 is smaller than the length of the second semicircular plate 102 in the axial direction of the centralizing body 1, so as to: the longer length of the second semicircular plates 102 is convenient for positioning the two second semicircular plates 102 with the drill rod, and the shorter length of the first semicircular plate 101 is for reducing weight. Furthermore, on this basis, the supporting rib plate 101 is a trapezoidal plate body, which can be a right trapezoid or an isosceles trapezoid. The short side of the trapezoidal plate body is connected with the inner wall of the first semicircular plate body 101, the long side of the trapezoidal plate body is connected with the outer wall of the second semicircular plate body 102, so that the side surface of the supporting rib plate is an inclined surface inclined from inside to outside, as shown in the right side drawing of fig. 3, and the centralizer can be conveniently pulled out from the hole. In this embodiment, the length of the short side of the trapezoid plate is equal to or slightly greater than the length of the first semicircular plate 101 in the axial direction of the centralizer, and the length of the long side of the trapezoid plate is equal to or slightly greater than the length of the second semicircular plate 102 in the axial direction of the centralizer.
Preferably, a layer of first hard alloy cutting block 5 is arranged on two sides of the trapezoid plate body (namely, two sides of the waist of the trapezoid plate body), the first hard alloy cutting block 5 may be spherical, strip-shaped, cylindrical, etc., and the used material may be one of PDC, silicon carbide, polycrystalline cubic boron nitride, or hard alloy materials. When the centralizer drills or pulls out with the drill rod rotating, the first hard alloy cutting block 5 serving as an auxiliary cutting block can crush rocks for the second time, and the outer cylinder (namely the first semicircular plate body 101) of the centralizer is protected by being beneficial to drilling or pulling out.
In a preferred embodiment of the present invention, the second cemented carbide cutting block 6 is disposed on the outer wall of the first semicircular plate 101, and the second cemented carbide cutting block 6 is arranged in an elongated shape on the outer wall of the first semicircular plate 101 along the axial direction of the first semicircular plate 101. Meanwhile, the second cemented carbide cutting blocks 6 are provided in plurality along the circumference of the first semicircular plate body 101. Specifically, when the second cemented carbide cutting block 6 is provided, first, a long groove is formed in the outer wall of the first semicircular plate 101, and the second cemented carbide cutting block 6 is filled in the long groove, so that the second cemented carbide cutting block 6 slightly protrudes from the outer wall surface of the first semicircular plate 101. The second cemented carbide cutting block 6 may also be spherical, cylindrical, etc., and the material used may be one of PDC, silicon carbide, polycrystalline cubic boron nitride, or cemented carbide material.
In order to increase the wear resistance, the invention imitates the body surface shapes of pangolins, crabs and the like, and the outer surface of the first semicircular plate body 101 is processed into a bionic non-smooth shape, namely, a bionic non-smooth unit body of iron-based Co/WC mixed alloy powder is formed on the outer wall of the first semicircular plate body 101 by adopting a laser cladding technology. The bionic non-smooth unit bodies are uniformly distributed and are in one or a combination of convex bag shape, groove shape and scale shape. The thickest protruding thickness of the non-smooth unit body is not more than 2 mm. The friction between the centralizer and the hole wall is reduced, and the wear resistance of the outer cylinder of the centralizer is enhanced.
The manufacturing method of the centralizer comprises the following steps:
a preparation stage: preparing blank blanks, steel wires, robots, welding equipment, horizontal lathes, nondestructive inspection detection equipment, heat treatment equipment and the like of all parts, performing layered processing on a designed centralizer outer cylinder three-dimensional model by using three-dimensional software, planning accumulation paths of the parts, and generating codes which can be identified by the robots and the welding equipment;
the net near forming stage of the first semicircular plate body 101 of the centralizer is as follows: operating a program, starting a robot and welding equipment, and performing layer-by-layer stacking forming by using an arc fuse additive manufacturing method to obtain a first semicircular plate body through net-close forming; and carrying out nondestructive flaw detection, and carrying out stress relief annealing treatment on the first semicircular plate body. The arc fuse accumulation protective gas is at least one of He and Ar, the flow rate of the protective gas is 15-35L/min, and the performance of the outer cylinder of the centralizer is guaranteed. The welding accumulation forming method can be one of argon tungsten-arc welding, cold metal transition welding and plasma arc surfacing.
Welding and heat treatment of parts: sequentially fixing the torque-transmitting key 4 and the second semicircular plate body 102, the second semicircular plate body 102 and the supporting rib plate 103, the first hinged seat 201, the second hinged seat 202 and the supporting rib plate 103, and the supporting rib plate 103 and the first semicircular plate body 101 by welding to form two identical centralizing bodies 1; the centralizing body 1 is subjected to stress relief annealing treatment integrally, so that welding stress is reduced, and subsequent material reduction processing is facilitated.
Assembling the centralizer: one ends of the two centralizers 1 are hinged and connected by matching a first pin shaft 203 with the first hinge seat 201 and the second hinge seat 202; the two centralizing bodies 1 and the central rod of the drill rod 7 are assembled concentrically, and a second pin shaft 301 and a fixing nut 302 are connected to corresponding positions of the two supporting ribbed plates 103 for fastening.
Fine machining and heat treatment of the outer cylinder of the centralizer: the center rod is clamped by a lathe to serve as a reference, and the outer cylinder of the centralizer formed by the two first semicircular plate bodies 101 is lathed to ensure the coaxiality with the center rod; according to the requirement, the outer cylinder of the centralizer is subjected to fine machining of a strip-shaped groove; and then, detaching the central rod, carrying out integral modulation treatment on the centralizing body 1, and carrying out nondestructive inspection.
Welding a wear-resistant body: and a second hard alloy cutting block 6 is welded in the strip-shaped groove of the centralizer outer cylinder, and first hard alloy cutting blocks 5 are welded at two sides of the supporting rib plate.
Surface treatment of the outer cylinder of the centralizer: according to the bionic design of the surface of the outer cylinder of the centralizer, one or a mixed material of tungsten carbide, chromium carbide and alloy steel is adopted, and a high-energy-density YAG laser is used for performing raised non-smooth laser cladding treatment on the surface of the outer cylinder of the centralizer to prepare a bionic structure. The laser cladding material is iron-based mixed Co/WC alloy powder, and the granularity of the WC powder is 20-50 mu m.
And finally, cleaning and spraying paint to obtain the product.
The method adopts a material-increasing and material-decreasing mixed manufacturing method, saves materials and time, improves the processing efficiency and the yield of products, is suitable for processing centralizers with various dimensions and specifications, and has good universality.
In the above description, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be understood broadly, and may be, for example, fixedly connected or detachably connected or integrated; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
The respective specific technical features described in the above-described embodiments may be combined in any suitable manner without contradiction as long as they do not depart from the gist of the present invention, and should also be regarded as being disclosed in the present invention.
Claims (7)
1. A centralizer suitable for underground drilling of a coal mine is characterized by comprising two semi-cylindrical centralizing bodies (1), and a hinged member (2) and a fastener (3) which are used for connecting the two centralizing bodies (1);
the centralizing body (1) comprises a first semicircular plate body (101), a second semicircular plate body (102) and a supporting rib plate (103), the diameter of the first semicircular plate body (101) is larger than that of the second semicircular plate body (102), and the inner diameter of the second semicircular plate body (102) is matched with the diameter of the drill rod (7); the second semicircular plate body (102) is arranged at the inner ring of the first semicircular plate body (101), and two sides of the first semicircular plate body (101) are respectively connected with two sides of the second semicircular plate body (102) through supporting rib plates (103);
one ends of the two centralizing bodies (1) are hinged together through the hinge piece (2), the two centralizing bodies (1) can rotate around the hinged positions of the two centralizing bodies and the hinge piece (2), the rotating direction is perpendicular to the axis direction of the first semicircular plate body (101), and the other ends of the two centralizing bodies (1) are fixed through the fastening piece (3), so that the two second semicircular plate bodies (102) form a circular profile for inserting a drill rod (7);
a torque transmission key (4) is arranged on the inner wall of the second semicircular plate body (102), a key groove (701) is correspondingly arranged on the drill rod (7), and the size of the key groove (701) is matched with that of the torque transmission key (4);
the first semicircular plate body (101) and the supporting rib plate (103) are both provided with weight-reducing deslagging holes (104);
a second hard alloy cutting block (6) is arranged on the outer wall of the first semicircular plate body (101), and the second hard alloy cutting block (6) is in a strip shape and is axially distributed along the outer wall of the first semicircular plate body (101);
the outer wall of the first semicircular plate body (101) is provided with bionic structure protrusions of iron-based Co/WC mixed alloy powder by adopting a laser cladding technology, the shapes of the bionic structure protrusions are one or more combination forms of convex bag shapes, groove shapes and scaly shapes, and the thickest protruding thickness is not more than 2 mm.
2. The centralizer for coal mine downhole drilling according to claim 1, wherein the length of the first semicircular plate body (101) in the axial direction of the centralizer (1) is smaller than the length of the second semicircular plate body (102) in the axial direction of the centralizer (1).
3. The centralizer suitable for underground coal mine drilling according to claim 1, wherein the supporting rib plates (103) are trapezoidal plate bodies, the short sides of the trapezoidal plate bodies are connected with the inner wall of the first semicircular plate body (101), and the long sides of the trapezoidal plate bodies are connected with the outer wall of the second semicircular plate body (102); first hard alloy cutting blocks (5) are arranged on two side edges of the trapezoidal plate body.
4. The centralizer suitable for underground coal mine drilling according to claim 1, wherein the hinged member (2) comprises a first hinged seat (201), a second hinged seat (202) and a first pin shaft (203), the first hinged seat (201) and the second hinged seat (202) are respectively provided with a first through hole for the first pin shaft (203) to be inserted into, and the first hinged seat (201) and the second hinged seat (202) can rotate around the first pin shaft (203); the first hinged seat (201) is fixed on a supporting rib plate (103) of one of the centralizing bodies, the second hinged seat (202) is fixed on a supporting rib plate (103) of the other centralizing body, and the axial direction of the first pin shaft (203) is the same as that of the centralizing body (1).
5. The centralizer suitable for underground coal mine drilling according to claim 1, wherein the fastener (3) comprises a second pin shaft (301) and a fixing nut (302), and second through holes for the second pin shaft (301) to pass through are formed in the supporting rib plates (103) of the two centralizers.
6. The centralizer for coal mine downhole drilling according to claim 1, wherein the weight-reduction deslagging hole (104) on the first semicircular plate body (101) is spirally arranged around the first semicircular plate body (101), and the spiral lead angle is 15-45 degrees.
7. The centralizer suitable for underground coal mine drilling according to claim 1, wherein the first semicircular plate body (101) and the second semicircular plate body (102) are connected with the two supporting rib plates (103) to form a semicircular cavity, and a plurality of supporting rib plates (103) are uniformly arranged in the semicircular cavity along the circumferential direction of the first semicircular plate body (101).
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| CN201911324325.4A CN111005689B (en) | 2019-12-20 | 2019-12-20 | Centralizer suitable for colliery is drilling usefulness in pit |
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| CN201911324325.4A CN111005689B (en) | 2019-12-20 | 2019-12-20 | Centralizer suitable for colliery is drilling usefulness in pit |
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| CN111005689A (en) | 2020-04-14 |
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