CN113187532A - Self-drilling anchor rod - Google Patents
Self-drilling anchor rod Download PDFInfo
- Publication number
- CN113187532A CN113187532A CN202110481353.8A CN202110481353A CN113187532A CN 113187532 A CN113187532 A CN 113187532A CN 202110481353 A CN202110481353 A CN 202110481353A CN 113187532 A CN113187532 A CN 113187532A
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- China
- Prior art keywords
- nut
- rod body
- face
- driving
- section
- Prior art date
- 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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Links
- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 230000013011 mating Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000002351 wastewater Substances 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
Abstract
The invention discloses a self-drilling anchor rod which comprises a rod body, a limiting nut and a driving nut, wherein the rod body is provided with a first end and a second end, external threads are arranged on the outer peripheral surface of the rod body, the limiting nut is in threaded fit on the rod body, the driving nut is in threaded fit on the rod body, when the driving nut rotates along a first direction, a first surface of the driving nut is abutted against a second surface of the limiting nut, and the rotating torque applied to the limiting nut by the driving nut is smaller than the rotating torque required by the limiting nut to rotate relative to the rod body, so that the limiting nut limits the driving nut to move towards the first end of the rod body, and the driving nut drives the rod body to rotate along the first direction. The self-drilling anchor rod has the characteristics of simple operation, easy processing and popularization, strong reliability and high production efficiency.
Description
Technical Field
The invention relates to the technical field of coal mining equipment, in particular to a self-drilling anchor rod.
Background
Roof and side support is of critical importance in mining and tunneling operations. The sides and roof of mines and tunnels are made up of rock strata which must be reinforced to prevent the possibility of landslide. Rock bolts are widely used to reinforce rock formations. In the related art, the use of a self-drilling bolt allows a hole to be drilled and secured in the bore hole for bolting in a single operation, but the machining is complicated and the production efficiency is low.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
in order to realize the functions of forward rotation drilling and reverse rotation pre-tightening in the use process of the self-drilling anchor rod, a pin hole is usually formed in the tail of the anchor rod, a pin is arranged in the pin hole for limiting, but the pin is complex in disassembly process, and due to the fact that the pin hole is machined in the anchor rod, the machining process is complex, the anchor rod is not suitable for large-scale production, the strength of the anchor rod is reduced, and the cost is increased.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides the self-drilling anchor rod which is simple in structure and reliable in performance.
The self-drilling anchor rod comprises a rod body, a limiting nut and a driving nut, wherein the rod body is provided with a first end and a second end, the outer peripheral surface of the rod body is provided with an external thread, the external thread extends from the first end to the second end along the length direction of the rod body for a preset length, the limiting nut is in threaded fit on the rod body, the limiting nut is provided with a first surface and a second surface which are opposite in the axial direction of the limiting nut, the driving nut is provided with a first surface and a second surface which are opposite in the axial direction of the driving nut, the driving nut is in threaded fit on the rod body, when the driving nut rotates along the first direction, the first surface of the driving nut is abutted against the second surface of the limiting nut, and the rotating torque applied to the limiting nut by the driving nut is smaller than the rotating torque required by the limiting nut to rotate relative to the rod body, so that the limit nut limits the driving nut to move towards the first end of the rod body, and the driving nut drives the rod body to rotate along the first direction.
According to the self-drilling anchor rod provided by the embodiment of the invention, the driving nut is stopped by the limiting nut, so that the driving nut drives the rod body to rotate, the function of drilling the rod body is realized, and the self-drilling anchor rod has the characteristics of simple structure, no change of the strength of the anchor rod, low cost and stable performance.
In some embodiments, the drive nut applies a pre-tensioning force to the shaft in a direction from the second end toward the first end when the drive nut is rotated in a second direction opposite the first direction.
In some embodiments, one of the second face of the stop nut and the first face of the drive nut is beveled such that the second face of the stop nut is in line contact with the first face of the drive nut when the drive nut is rotated in the first direction.
In some embodiments, the second face of the stop nut is a beveled face and the first face of the drive nut is a flat face.
In some embodiments, an annular boss is provided on one of the second face of the limit nut and the first face of the drive nut.
In some embodiments, the driving nut includes a first section and a second section, the central hole of the first section is a threaded hole, the central hole of the second section is a fitting hole, the diameter of the fitting hole is larger than that of the threaded hole, the limit nut is fitted in the fitting hole, and a gap is formed between the outer circumferential surface of the limit nut and the inner circumferential surface of the fitting hole.
In some embodiments, the stop nut is fitted to the first end of the rod body, the first surface of the stop nut is flush with the first surface of the driving nut, and the driving nut is a hexagonal nut.
In some embodiments, the rod body is divided into a first rod section and a second rod section along the length direction of the rod body, the external thread is formed on the whole length of the first rod section, and the outer peripheral surface of the second rod section is a smooth surface.
In some embodiments, the rod body is made of a corrosion resistant material.
In some embodiments, a channel is further provided in the shaft body and penetrates through the shaft body along the length direction of the shaft body.
Drawings
Fig. 1 is a schematic structural view of a self-drilling bolt of the present invention.
Fig. 2 is a cross-sectional view taken along direction a in fig. 1.
Reference numerals:
the body of rod 1, first end 11, second end 12, first pole section 13, second pole section 14, passageway 15, stop nut 2, stop nut's first face 21, stop nut's second face 22, driving nut 3, driving nut's first face 31, driving nut's second face 32, driving nut's first section 33, driving nut's second section 34, mating holes 341, drill bit 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A self drilling bolt according to an embodiment of the present invention will now be described with reference to figures 1-2.
The self-drilling type anchor rod according to the embodiment of the present invention includes a rod body 1, a limit nut 2 and a driving nut 3.
The rod body 1 is provided with a first end 11 and a second end 12, and an external thread is arranged on the outer peripheral surface of the rod body 1 and extends from the first end 11 to the second end 12 along the length direction of the rod body 1 by a preset length.
As shown in fig. 1, the first end 11 of the rod body 1 is a right end, the second end 12 is a left end, an external thread is arranged on the outer peripheral surface of the right end of the rod body 1 with a certain length from right to left, a drill bit 4 is further arranged at the left end of the rod body 1, and the drill bit 4 is used for drilling when the rod body 1 drills in left to drive the rod body 1 to move left.
A limit nut 2 is screw-fitted on the rod body 1, and the limit nut 2 has a first face 21 and a second face 22 opposite in the axial direction of the limit nut 2.
As shown in fig. 2, the limit nut 2 is disposed at the right end of the rod body 1 through a thread fit, the first surface 21 of the limit nut is a right side surface, the second surface 22 of the limit nut is a left side surface, and the right side surface and the left side surface of the limit nut 2 are opposite in the left-right direction.
The driving nut 3 is provided with a first surface 31 and a second surface 32 which are opposite to each other in the axial direction of the driving nut 3, the driving nut 3 is in threaded fit on the rod body 1, when the driving nut 3 rotates along the first direction, the first surface 31 of the driving nut and the second surface 22 of the limiting nut are abutted, and the rotating torque applied to the limiting nut 2 by the driving nut 3 is smaller than the rotating torque required by the limiting nut 2 to rotate relative to the rod body 1, so that the limiting driving nut 3 of the limiting nut 2 moves towards the first end 11 of the rod body 1, and the driving nut 3 drives the rod body 1 to rotate along the first direction.
The first face 31 of drive nut is the right flank, and drive nut second face 32 is the left surface, and the right flank and the left surface of drive nut 3 are relative in the left-right direction, and drive nut 3 passes through screw-thread fit to be established on the body of rod 1, and is located the left side of stop nut 2.
When the driving nut 3 rotates along the first direction, the driving nut 3 moves rightwards to enable the first surface 31 of the driving nut to be abutted against the second surface 22 of the limiting nut, at the moment, the rotating torque generated between the first surface 31 of the driving nut and the second surface 22 of the limiting nut due to friction force and the like is smaller than the rotating torque required by the limiting nut 2 to rotate relative to the rod body 1, the limiting nut 2 does not rotate relative to the rod body 1, the driving nut 3 is blocked by the limiting nut 2 and cannot move rightwards, and therefore the rod body 1 rotates along with the driving nut 3 along the first direction.
According to the self-drilling anchor rod provided by the embodiment of the invention, the driving nut 3 is stopped by the limiting nut 2, so that the driving nut 3 drives the rod body 1 to rotate, the function of drilling the hole by rotating the rod body 1 is further realized, the strength of the anchor rod is not required to be changed by drilling, and the self-drilling anchor rod has the characteristics of simple structure, low cost and stable performance.
In some embodiments, when the drive nut 3 is rotated in a second direction opposite to the first direction, the drive nut 3 applies a pretension force on the rod body 1 in a direction from the second end 12 towards the first end 11.
When the driving nut 3 rotates along the second direction, the driving nut 3 moves leftwards along the rod body 1 due to the fact that the second direction is opposite to the first direction, but the driving nut 3 is arranged on the anchor rod equipment and cannot move leftwards, so that the rod body 1 can be driven to move leftwards relative to the driving nut 3, the rod body 1 is fixed in a drill hole and cannot move, and therefore the driving nut 3 can apply pre-tightening tension to the rod body 1 from left to right, and pre-tightening of the rod body 1 is completed.
According to the self-drilling anchor rod provided by the embodiment of the invention, the pretightening force is generated by the reverse rotation of the driving nut 3, the pretightening force is applied to the rod body 1, the operation steps are simple, and the production efficiency can be improved.
In some embodiments, one of the second face 22 of the retaining nut and the first face 31 of the drive nut is beveled so that the second face 22 of the retaining nut is in line contact with the first face 31 of the drive nut when the drive nut 3 is rotated in the first direction.
One of the second surface 22 of the limit nut and the first surface 31 of the driving nut is an inclined surface, for example, the second surface 22 of the limit nut is an inclined surface, the first surface 31 of the driving nut is a plane, or the first surface 31 of the driving nut is an inclined surface, the second surface 22 of the limit nut is a plane, at this time, the contact between the second surface 22 of the limit nut and the first surface 31 of the driving nut is line contact, when the driving nut 3 rotates along the first direction, the rotating torque generated by the second surface 22 of the limit nut and the first surface 31 of the driving nut is small, which is not enough for the driving nut 3 to drive the limit nut 2 to rotate along the first direction, and the driving nut 3 is blocked by the limit nut 2 and cannot move rightwards.
In some embodiments, the second face 22 of the limit nut is a beveled face and the first face 31 of the drive nut is a flat face.
When the driving nut 3 rotates along the first direction, the contact between the second surface 22 of the limit nut and the first surface 31 of the driving nut is line contact, and the generated rotating torque is small and is not enough to enable the driving nut 3 to drive the limit nut 2 to rotate along the first direction.
In some embodiments, an annular boss is provided on one of the second face 22 of the limit nut and the first face 31 of the drive nut.
Be equipped with annular boss on one in limit nut's second face 22 and drive nut's the first face 31, be equipped with annular boss on limit nut's the second face 22 for example, drive nut's the first face 31 is the plane, or be equipped with annular boss on drive nut's the first face 31, limit nut's the second face 22 is the plane, when drive nut 3 rotates along first direction, the area of contact between limit nut's the second face 22 and the drive nut's the first face 31 reduces, the turning moment who produces is less, be not enough to make drive nut 3 drive limit nut 2 rotate along first direction, thereby make drive nut 3 blockked by limit nut 2 and can't move to the right.
In some embodiments, the driving nut 3 includes a first section 33 and a second section 34, the central hole of the first section 33 is a threaded hole, the central hole of the second section 34 is a fitting hole 341, the diameter of the fitting hole 341 is larger than that of the threaded hole, the limit nut 2 is fitted in the fitting hole 341 with a gap between the outer circumferential surface of the limit nut 2 and the inner circumferential surface of the fitting hole 341.
As shown in fig. 1-2, the first section 33 of the driving nut is a left section, the second section 34 of the driving nut is a right section, the first section 33 and the second section 34 are connected in the left-right direction, the center hole of the first section 33 of the driving nut is a threaded hole, the center hole of the second section 34 of the driving nut is a mating hole 341, the threaded hole and the mating hole 341 are communicated with each other, the diameter of the matching hole 341 is larger than that of the threaded hole, a step is formed at the junction of the threaded hole and the matching hole 341, the step surface is the first surface 31 of the driving nut, the limit nut 2 is matched in the matching hole 341, the left end surface of the limit nut 2 is the second surface 22 of the limit nut, the first surface 31 of the driving nut and the second surface 22 of the limit nut are opposite in the left-right direction, a gap is formed between the outer peripheral surface of the limit nut 2 and the inner peripheral surface of the matching hole 341, to reduce the rotational torque generated to the limit nut 2 when the drive nut 3 is rotated in the first direction.
In some embodiments, the stop nut 2 is fitted at the first end 11 of the rod body 1, the first face 21 of the stop nut is flush with the first face 31 of the drive nut, and the drive nut 3 is a hex nut.
As shown in fig. 1, the limit nut 2 is arranged at the right end of the rod body 1, the limit nut 2 is matched in the matching hole 341 of the driving nut 3, the first surface 21 of the limit nut is flush with the first surface 31 of the driving nut, so that other devices are prevented from influencing the rotating torque of the limit nut 2, the driving nut 3 is a hexagon nut, the hexagon nut is convenient to control the rotating direction of the hexagon nut, and the rotating torque is large.
In some embodiments, the rod body 1 is divided into a first rod section 13 and a second rod section 14 along the length direction of the rod body 1, the external thread is formed on the whole length of the first rod section 13, and the outer peripheral surface of the second rod section 14 is smooth.
As shown in fig. 2, the first rod section 13 of the rod body is a right end rod section, the second rod section 13 of the rod body is a left end rod section, an external thread is formed on the outer peripheral surface of the first rod section 13, the driving nut 3 and the limiting nut 2 are in thread fit with each other on the first rod section 13, the external thread is simple to process, the thread fit performance is stable, and the strength of the anchor rod is not changed. The outer circumferential surface of the second rod section 14 is smooth and is easily fixed in the borehole by an anchoring agent.
In some embodiments, the rod body 1 is made of a corrosion resistant material.
In the drilling process, a large amount of waste water can be generated, the waste water has certain corrosivity, the rod body 1 is in long-term contact with the waste water, the corrosion-resistant material is used for manufacturing the rod body 1, and the service life of the rod body 1 can be prolonged.
In some embodiments, a channel 15 is also provided in the shaft 1 and extends through the shaft 1 along the length of the shaft 1.
As shown in fig. 2, a channel 15 penetrating the rod body 1 in the left-right direction is arranged in the rod body 1, the channel 15 can discharge waste water in the drilling process during the drilling process of the rod body 1, and the anchoring agent for fixing the anchor rod after the drilling process can be added into a drilled hole through the channel 15.
According to the self-drilling anchor rod disclosed by the embodiment of the invention, the channel 15 is arranged in the rod body 1, so that the waste water in the drilling process is simply and effectively discharged, the using effect of the anchoring agent can be improved, and the self-drilling anchor rod has the characteristics of labor saving, high anchoring quality and improvement on production efficiency and quality.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A self drilling bolt, comprising:
the rod body is provided with a first end and a second end, the outer peripheral surface of the rod body is provided with an external thread, and the external thread extends from the first end to the second end by a preset length along the length direction of the rod body;
the limiting nut is in threaded fit with the rod body and is provided with a first surface and a second surface which are opposite in the axial direction of the limiting nut;
the driving nut is provided with a first surface and a second surface which are opposite to each other in the axial direction of the driving nut, the driving nut is in threaded fit with the rod body, when the driving nut rotates along the first direction, the first surface of the driving nut is abutted against the second surface of the limiting nut, and the rotating torque applied to the limiting nut by the driving nut is smaller than the rotating torque required by the limiting nut to rotate relative to the rod body, so that the limiting nut limits the driving nut to move towards the first end of the rod body, and the driving nut drives the rod body to rotate along the first direction.
2. A self drilling bolt according to claim 1, wherein the drive nut applies a pre-tensioning force to the shank in a direction from the second end towards the first end when the drive nut is rotated in a second direction opposite to the first direction.
3. A self drilling bolt according to claim 1, wherein one of the second face of the limit nut and the first face of the drive nut is bevelled so that the second face of the limit nut is in line contact with the first face of the drive nut when the drive nut is rotated in the first direction.
4. A self drilling bolt according to claim 3, wherein the second face of the limit nut is a ramped face and the first face of the drive nut is a flat face.
5. A self drilling bolt according to claim 1, wherein one of the second face of the limit nut and the first face of the drive nut is provided with an annular boss.
6. A self drilling bolt according to claim 1, wherein the drive nut comprises a first section and a second section, the central bore of the first section is a threaded bore and the central bore of the second section is a mating bore, the diameter of the mating bore being greater than the diameter of the threaded bore, the limit nut fits within the mating bore with a clearance between the outer circumferential surface of the limit nut and the inner circumferential surface of the mating bore.
7. A self drilling bolt according to claim 4, wherein the stop nut is fitted to the first end of the shank, the first face of the stop nut being flush with the first face of the drive nut, the drive nut being a hex nut.
8. A self drilling bolt according to claim 1, wherein the shank is divided into a first section and a second section along the length of the shank, the external thread is formed over the entire length of the first section, and the outer circumferential surface of the second section is smooth.
9. A self drilling bolt according to claim 1, wherein the shank is made of a corrosion resistant material.
10. A self drilling bolt according to any one of claims 1 to 9, wherein a passage is provided through the body along its length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110481353.8A CN113187532B (en) | 2021-04-30 | 2021-04-30 | Self-drilling anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110481353.8A CN113187532B (en) | 2021-04-30 | 2021-04-30 | Self-drilling anchor rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113187532A true CN113187532A (en) | 2021-07-30 |
| CN113187532B CN113187532B (en) | 2023-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110481353.8A Active CN113187532B (en) | 2021-04-30 | 2021-04-30 | Self-drilling anchor rod |
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| CN (1) | CN113187532B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330320A (en) * | 1970-10-12 | 1973-09-19 | Mac Lean Fogg Lock Nut Co | Fastener assemblies |
| AU5933899A (en) * | 1998-11-10 | 2000-05-11 | Dywidag-Systems International Pty. Limited | Rock bolt drive system |
| US20040046389A1 (en) * | 2002-09-11 | 2004-03-11 | Smith Radford S. | Torque-limiting bolt-and-nut assembly |
| AU2004200570A1 (en) * | 2003-02-13 | 2004-09-02 | Airlaw Pty Limited | Rock Bolt Assembly |
| CN101305161A (en) * | 2005-11-09 | 2008-11-12 | 山特维克知识产权股份有限公司 | Self drilling rock bolt |
| WO2012071625A1 (en) * | 2010-12-01 | 2012-06-07 | Peter Andrew Gray | A nut assembly |
| EP3336365A1 (en) * | 2016-12-19 | 2018-06-20 | fischerwerke GmbH & Co. KG | Closed nut on one side, expansion anchor comprising such a nut and method for screwing and tightening the nut |
| CN210164493U (en) * | 2019-07-08 | 2020-03-20 | 中国神华能源股份有限公司 | Anchor rod |
-
2021
- 2021-04-30 CN CN202110481353.8A patent/CN113187532B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330320A (en) * | 1970-10-12 | 1973-09-19 | Mac Lean Fogg Lock Nut Co | Fastener assemblies |
| AU5933899A (en) * | 1998-11-10 | 2000-05-11 | Dywidag-Systems International Pty. Limited | Rock bolt drive system |
| US20040046389A1 (en) * | 2002-09-11 | 2004-03-11 | Smith Radford S. | Torque-limiting bolt-and-nut assembly |
| AU2004200570A1 (en) * | 2003-02-13 | 2004-09-02 | Airlaw Pty Limited | Rock Bolt Assembly |
| CN101305161A (en) * | 2005-11-09 | 2008-11-12 | 山特维克知识产权股份有限公司 | Self drilling rock bolt |
| US20090220309A1 (en) * | 2005-11-09 | 2009-09-03 | Sandvik Intellectual Property Ab | Self Drilling Rock Bolt |
| WO2012071625A1 (en) * | 2010-12-01 | 2012-06-07 | Peter Andrew Gray | A nut assembly |
| EP3336365A1 (en) * | 2016-12-19 | 2018-06-20 | fischerwerke GmbH & Co. KG | Closed nut on one side, expansion anchor comprising such a nut and method for screwing and tightening the nut |
| CN210164493U (en) * | 2019-07-08 | 2020-03-20 | 中国神华能源股份有限公司 | Anchor rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113187532B (en) | 2023-01-10 |
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