CN209837022U - Anchor rod - Google Patents

Abstract

The utility model belongs to the technical field of hardware and tools technique and specifically relates to an anchor rod is related to. The anchor rod comprises a screw rod and a sleeve; a first limiting hole is formed in the peripheral wall of the sleeve, a first blade is connected in the first limiting hole and protrudes out of the inner peripheral surface of the sleeve; the screw rod is inserted in the sleeve, and when the screw rod moves in the sleeve along the axis direction of the screw rod, the screw rod can push the first blade to protrude out of the outer peripheral surface of the sleeve through the first limiting hole. An object of the utility model is to provide an anchor rod to alleviate the lower technical problem of the anchor strength of the anchor rod in the wall body that exists among the prior art.

Description

Anchor rod

Technical Field

The utility model belongs to the technical field of hardware and tools technique and specifically relates to an anchor rod is related to.

Background

The anchor rod is widely applied to various engineering constructions (particularly traffic engineering), and mainly provides anchoring force for the anchor rod by pouring grouting bodies (concrete) around the anchor rod and between walls and bonding the anchor rod and the walls into a whole. However, the anchoring force between the anchor rod and the wall body is mainly determined by the adhesive force of the slurry material, the source of the anchoring force is single, so that the drawing force applied to the anchor rod is limited, and in some projects needing to provide larger drawing force resistance, the quality problem that the anchor rod and the slurry body fall off from an anchor hole at the same time often occurs, so that the project safety is seriously threatened, and the construction progress is influenced.

The present application therefore provides a new bolt that addresses the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anchor rod to alleviate the lower technical problem of the anchor strength of the anchor rod in the wall body that exists among the prior art.

Based on the above purpose, the utility model provides an anchor rod, which comprises a screw rod and a sleeve;

a first limiting hole is formed in the peripheral wall of the sleeve, and a first blade is connected in the first limiting hole; the first blade protrudes out of the inner circumferential surface of the sleeve;

the screw rod is inserted into the sleeve, and when the screw rod moves in the sleeve along the axis direction of the screw rod, the screw rod can push the first blade to protrude out of the outer peripheral surface of the sleeve through the first limiting hole.

In the above technical solution, further, in the present invention, along the radial direction of the sleeve, the first blade includes a first surface and a second surface corresponding to each other, and the first surface is close to the axis of the sleeve relative to the second surface; the screw rod is inserted into the sleeve, and when the screw rod is static relative to the sleeve, the second surface does not protrude out of the peripheral surface of the sleeve.

In any of the above technical solutions, further, the first blade of the present invention includes a first portion and a second portion connected to each other; one surface of the first part, which is far away from the second part, is the second surface, and one surface of the second part, which is far away from the first part, is the first surface; the area of the first face is smaller than the area of the second face.

In any of the above technical solutions, further, the sleeve of the present invention has a plurality of first limiting holes, and each of the first limiting holes is provided with the first blade; the first limiting holes are uniformly distributed on the sleeve along the axial direction of the sleeve, and the first limiting holes are arranged on the sleeve in a staggered mode along the circumferential direction of the sleeve.

In any of the above technical solutions, further, the sleeve of the present invention includes a first end and a second end corresponding to each other along the axial direction; the screw rod comprises a third end and a fourth end which correspond to each other along the axial direction of the screw rod;

a limiting bulge is arranged on the inner circumferential surface of the sleeve, and one surface of the limiting bulge, which is close to the first end, is vertical to the axis of the sleeve;

the screw rod is provided with a limiting groove matched with the limiting bulge, and the limiting groove extends along the axial direction of the screw rod;

and the wall surface of the limiting groove close to the third end is vertical to the axis of the screw rod.

In any one of the above technical solutions, further, the utility model discloses spacing arch is close to the one side of second end is the inclined plane, and follows the second end extremely first end, the inclined plane is close to gradually the sheathed tube axis.

In any one of the above technical solutions, further, the limiting groove is close to the wall surface of the fourth end with the tank bottom rounding off of limiting groove.

In any one of the above technical solutions, further, the limiting groove is followed two walls of sheathed tube circumference with the tank bottom of limiting groove is perpendicular, spacing arch with the limiting groove phase-match.

In any of the above technical solutions, further, the anchor rod of the present invention further includes a fixing block;

a second limiting hole is formed in the peripheral wall, close to the first end, of the sleeve, a second blade is connected into the second limiting hole and protrudes out of the inner peripheral surface of the sleeve;

the fixed block is inserted in the sleeve and is positioned on one side, close to the first end, of the screw rod, and when the screw rod pushes the fixed block to move towards the first end, the fixed block can push the second blades to protrude out of the outer peripheral surface of the sleeve through the second limiting holes.

In any of the above technical solutions, further, the screw of the present invention is provided with a blade groove matching with the first blade, and the blade groove and the limiting groove are arranged at intervals along the axial direction of the screw;

when one surface of the limiting protrusion, which is close to the first end, is abutted against the wall surface of the limiting groove, which is close to the third end, the first blade is positioned between the blade groove and the limiting groove.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

when the anchor rod is used, the sleeve and the screw rod are inserted into the anchor hole on the wall body together, wherein the screw rod moves in the sleeve along the axis direction, the screw rod is in contact with the first blade in the first limiting hole, the first blade is pushed in the radial direction far away from the screw rod along the sleeve, and the first blade protrudes out of the outer peripheral surface of the sleeve through the first limiting hole, so that the first blade can be inserted into the wall body to provide the grabbing force for anchoring the sleeve in the wall body, and the sleeve is fixed in the wall body. To sum up, the utility model discloses an anchor rod replaces the use of slip casting body through the mode of mechanical fastening to avoid the slip casting body to drop easily from the anchor eye and lead to the lower problem of anchor rod anchor in the intensity of wall body, thereby improved the anchor strength of sleeve pipe rigid coupling in the wall body.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an anchor rod provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of another state of the anchor rod provided by the embodiment of the invention;

fig. 3 is an exploded view of an anchor rod according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sleeve of an anchor rod according to an embodiment of the present invention;

fig. 5 is a schematic structural view of another state of the sleeve of the anchor rod according to the embodiment of the present invention;

FIG. 6 is an enlarged view of a portion A of the sleeve shown in FIG. 5;

fig. 7 is a cross-sectional view of a sleeve of an anchor rod according to an embodiment of the present invention;

fig. 8 is a cross-sectional view of another state of the sleeve of the anchor rod according to the embodiment of the present invention;

fig. 9 is a schematic structural view of a screw rod of an anchor rod according to an embodiment of the present invention.

Icon: 1-a screw; 2-a sleeve; 21-a first limit hole; 3-a first blade; 31-a first portion; 32-a second portion; 4-a second blade; 5-limiting bulges; 6-a limiting groove; 7-a vane slot; 8, fixing blocks; 91-a nut; 92-a spring washer; 93-Flat gasket.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1-9, the present embodiment provides a rock bolt including a threaded rod 1 and a sleeve 2; the peripheral wall of the sleeve 2 is provided with a first limiting hole 21, the first limiting hole 21 is internally connected with a first blade 3, the first blade 3 protrudes out of the inner peripheral surface of the sleeve 2, the screw 1 is inserted into the sleeve 2, and when the screw 1 moves in the sleeve 2 along the axis direction of the screw, the screw 1 can push the first blade 3 to protrude out of the outer peripheral surface of the sleeve 2 through the first limiting hole 21. That is, in the present embodiment, the thickness of the first blade 3 in the radial direction of the casing 2 is larger than the pipe diameter of the casing 2.

When the anchor rod is used, the sleeve 2 and the screw rod 1 are inserted into the anchor hole in the wall body together, wherein in the process that the screw rod 1 moves in the sleeve 2 along the axis direction, the screw rod 1 is in contact with the first blade 3 in the first limiting hole 21, the first blade 3 is pushed in the direction away from the screw rod 1 along the radial direction of the sleeve 2, and the first blade 3 protrudes out of the outer peripheral surface of the sleeve 2 through the first limiting hole 21, so that the first blade 3 can be inserted into the wall body to provide holding power for anchoring the sleeve 2 in the wall body, and the sleeve 2 is fixed in the wall body. In conclusion, the anchor rod of this embodiment replaces the use of grout through the mode of mechanical fastening to avoid the grout to easily drop from the anchor eye and lead to the anchor rod to anchor in the lower problem of intensity of wall body, thereby improved the anchor intensity of sleeve pipe 2 rigid coupling in the wall body.

Preferably, referring to fig. 4, in the present embodiment, in the radial direction of the sleeve 2, the first blade 3 includes a first surface and a second surface corresponding to each other, and the first surface is close to the axis of the sleeve 2 relative to the second surface, so that the first surface protrudes from the inner circumferential surface of the sleeve 2, the screw 1 is inserted into the sleeve 2, and when the screw 1 is stationary relative to the sleeve 2, the second surface does not protrude from the outer circumferential surface of the sleeve 2, so as to insert the sleeve 2 into a wall body. When the screw 1 moves in the sleeve 2, the first surface abuts against the screw 1, and the second surface protrudes from the outer peripheral surface of the sleeve 2.

Preferably, the second face coincides with a projection of the outer peripheral surface of the sleeve 2 in the axial direction of the sleeve 2. That is, when the screw 1 does not move in the casing 2, the second surface has the same shape as the outer peripheral surface of the casing 2, and such an arrangement can ensure that the casing 2 can be smoothly inserted into the anchor hole without causing damage to the casing 2 due to friction, collision, or the like with the anchor hole when the casing 2, into which the screw 1 is not inserted, is inserted into the anchor hole; after the sleeve 2 is completely inserted into the anchor hole, the screw rod 1 is moved in the sleeve 2 to open the first blade 3, that is, the second surface of the first blade 3 protrudes out of the outer peripheral surface of the sleeve 2, so that the sleeve 2 is fixedly connected in the wall body.

Preferably, as shown in fig. 5 and 6, the first blade 3 comprises a first portion 31 and a second portion 32 connected; one surface of the first portion 31, which is far away from the second portion 32, is a second surface, and one surface of the second portion 32, which is far away from the first portion 31, is a first surface; wherein the area of the first surface is smaller than that of the second surface.

In this arrangement, the screw 1 supplies the pressure to the second portion 32, and transmits the pressure to the first portion 31 through the second portion 32, thereby transmitting the pressure from the first portion 31 to the wall. Because the area of the first surface on the second part 32 is smaller, the pressure of the screw rod 1 acting on the first blade 3 is larger, the larger pressure acts on the wall body through the first part 31, and because the area of the second surface is larger, and the pressure is in direct proportion to the acting area, the pressure of the first part 31 acting on the wall body is increased, the grabbing force of the first part 31 in the wall body is further improved, and the sleeve 2 is anchored on the wall body more reliably and firmly.

Preferably, the second portion 32 is rounded everywhere in the direction close to the axis of the casing 2 to prevent the second portion 32 from scratching the screw 1.

Preferably, as shown in fig. 4 and 5, there are a plurality of first limiting holes 21 on the sleeve 2, and each first limiting hole 21 is provided with a first blade 3; along the axial direction of sleeve pipe 2, a plurality of first spacing holes 21 evenly distributed on sleeve pipe 2, along sleeve pipe 2's circumference, a plurality of first spacing holes 21 are the setting of staggering on sleeve pipe 2.

By the arrangement, the firmness of grabbing the first blade 3 on the sleeve 2 on the wall is further improved. For example, two, three, four, or the like first limiting holes 21 are formed along the circumferential direction of the sleeve 2; two, three or four first limiting holes 21 are formed in the axial direction of the sleeve 2; in addition, along the circumference of sleeve pipe 2, a plurality of spacing holes 21 crisscross setting to improved along axial spacing to sleeve pipe 2, further improved the tensile resistance of sleeve pipe 2 and pulled out, prevent that sleeve pipe 2 from droing in the wall body.

Preferably, as shown in fig. 7 and 8, the sleeve 2 comprises, along its axial direction, a first end and a second end, respectively; the screw rod 1 comprises a third end and a fourth end which correspond to each other along the axial direction; the inner peripheral surface of the sleeve 2 is provided with a limiting bulge 5, and one surface of the limiting bulge 5, which is close to the first end, is vertical to the axis of the sleeve 2.

Referring to fig. 9, a limit groove 6 matched with the limit protrusion 5 is formed on the screw rod 1, and the limit groove 6 extends along the axial direction of the screw rod 1; the wall surface of the limiting groove 6 close to the third end is vertical to the axis of the screw rod 1.

When the wall fixing device is used, the first end of the sleeve 2 is inserted into the anchor hole in the wall, the screw rod 1 is inserted into the sleeve 2, the fourth end of the screw rod corresponds to the second end of the sleeve 2, and the limiting protrusion 5 is located in the limiting groove 6; wherein, when screw rod 1 removed relative sleeve pipe 2, also made screw rod 1 remove to the direction of keeping away from first end, spacing arch 5 slided in spacing groove 6 this moment, and spacing groove 6 provides the guide effect for screw rod 1's removal, avoids screw rod 1 to rock at the in-process that inserts sleeve pipe 2.

In addition, when the screw rod 1 is moved towards the direction far away from the first end, the screw rod 1 is moved in the sleeve 2 along the axis direction of the screw rod until the surface of the limiting protrusion 5 close to the first end is contacted with the wall surface of the limiting groove 6 close to the third end, because the surface of the limiting protrusion 5 close to the first end is perpendicular to the axis of the sleeve 2, the wall surface of the limiting groove 6 close to the third end is perpendicular to the axis of the screw rod 1, the surface of the limiting protrusion 5 close to the first end is abutted to the wall surface of the limiting groove 6 close to the third end, the screw rod 1 can not be continuously moved towards the direction far away from the first end, the screw rod 1 can not be pulled out from the sleeve 2, and the limiting and fixing of the sleeve 2 to the screw.

Preferably, as shown in fig. 6 and 7, there are a plurality of limiting protrusions 5, and the plurality of limiting protrusions 5 are arranged at intervals along the axial direction of the sleeve 2, correspondingly, there are a plurality of limiting grooves 6 on the screw rod 1, and the plurality of limiting protrusions 5 and the plurality of limiting grooves 6 are respectively in one-to-one correspondence.

Preferably, as shown in fig. 1 and fig. 2, an external thread is provided on a side of the screw rod 1 near the second end, a nut 91 is screwed on the external thread, and a spring washer 92 and a flat washer 93 are sleeved on the screw rod 1 for fixedly connecting various parts and tools in engineering construction.

Preferably, as shown in fig. 7 and 8, a surface of the limiting protrusion 5 near the second end is an inclined surface, and from the second end to the first end, the inclined surface is gradually close to the axis of the sleeve 2, that is, one end of the inclined surface near the first end is closer to the axis of the sleeve 2 than one end of the inclined surface near the second end.

Such setting, when moving screw rod 1 from the second end of sleeve pipe 2 to the direction that is close to the first end, screw rod 1 at first contacts with the one end that spacing arch 5 is close to the second end, and then screw rod 1 moves along the inclined plane, and the setting on inclined plane provides the guide effect for screw rod 1's removal, has guaranteed that screw rod 1 can move to the direction that is close to the first end in sleeve pipe 2.

Preferably, as shown in fig. 9, the wall surface of the limiting groove 6 near the fourth end is in smooth transition with the groove bottom of the limiting groove 6.

When the screw rod 1 moves towards the direction close to the first end, the limiting protrusion 5 is firstly contacted with one side of the limiting groove 6 close to the fourth end, and the wall surface of the limiting groove 6 close to the fourth end and the groove bottom of the limiting groove 6 are in smooth transition, so that the limiting protrusion 5 can stably enter the limiting groove 6, and the collision to the limiting protrusion 5 is avoided to a certain extent.

Preferably, as shown in fig. 9, two wall surfaces of the limiting groove 6 along the circumferential direction of the sleeve 2 are perpendicular to the groove bottom of the limiting groove 6, and the limiting protrusion 5 is matched with the limiting groove 6. Such setting, when spacing arch 5 slides to spacing inslot 6, spacing inslot 6 can be spacing 5 along sleeve pipe 2's circumference, prevent spacing arch 5 along sleeve pipe 2's circumferential direction, therefore prevent that screw rod 1 from following its circumferential direction in sleeve pipe 2, reduced the vibration between screw rod 1 and the sleeve pipe 2, prevent that screw rod 1 from rotating when screw rod 1 removes in sleeve pipe 2, further improved the fastness and the stability that screw rod 1 is fixed in sleeve pipe 2.

Preferably, referring to fig. 3, in the present embodiment, the anchor rod further includes a fixing block 8; a second limiting hole is formed in the peripheral wall, close to the first end, of the sleeve 2, a second blade 4 is connected into the second limiting hole, and the second blade 4 protrudes out of the inner peripheral surface of the sleeve 2; the fixed block 8 is inserted in the sleeve 2 and is located on one side of the screw rod 1 close to the first end, and when the screw rod 1 pushes the fixed block 8 to move close to the first end, the fixed block 8 can push the second blade 4 to protrude out of the outer peripheral surface of the sleeve 2 through the second limiting hole.

Optionally, the fixing block 8 and the screw rod 1 are integrally formed or designed in a split manner, and preferably, the fixing block 8 and the screw rod 1 are designed in a split manner. Through the split type structural design of the fixing block 8 and the screw rod 1, when the anchor rod is used, the screw rod 1 is firstly pushed, the screw rod 1 is enabled to move towards the direction close to the first end, so that the screw rod 1 can push the fixing block 8 to move towards the first end of the sleeve 2, until the fixing block 8 reaches the first end of the sleeve 2, the wall body is propped against the fixing block 8, the fixing block 8 cannot continue to move, at the moment, the outer peripheral surface of the fixing block 8 pushes the second blade 4 to move towards the direction far away from the screw rod 1 along the radial direction of the sleeve 2, so that the second blade 4 protrudes out of the outer peripheral surface of the sleeve 2 through the second limiting hole; when the screw rod 1 moves towards the direction far away from the first end, the fixing block 8 cannot move along with the screw rod 1, but is always positioned at the first end to support the second blade 4, so that the second blade 4 is always and tightly grabbed and fixed in the wall body, and the sleeve 2 can also be fixed in the wall body and cannot move along with the screw rod 1 in the process that the screw rod 1 moves towards the direction far away from the first end.

Preferably, as shown in fig. 9, the screw 1 is provided with a blade groove 7 matched with the first blade 3, and the blade groove 7 and the limit groove 6 are arranged at intervals along the axial direction of the screw 1; when the surface of the limiting protrusion 5 close to the first end is abutted against the wall surface of the limiting groove 6 close to the third end, the first blade 3 is positioned between the blade groove 7 and the limiting groove 6.

When the screw 1 is inserted into the sleeve 2, the first blade 3 firstly contacts with one side of the blade groove 7 close to the third end, and as the screw 1 is continuously inserted into the sleeve 2, the first blade 3 enters the blade groove 7 and slides along the blade groove 7; when the screw 1 is pulled out of the sleeve 2, the first blade 3 slides along the blade groove 7 in the opposite direction until the first blade is separated from the blade groove 7 and slides between the blade groove 7 and the limit groove 6, and at the moment, the first blade 3 protrudes out of the outer peripheral surface of the sleeve 2 through the first limit hole 21; simultaneously, the one side that spacing arch 5 is close to first end and spacing groove 6 are close to between the wall of third end butt, have realized being fixed in sleeve pipe 2 with screw rod 1. In conclusion, the anchor rod of the present embodiment can fix the screw rod 1 to the sleeve 2 and fix the sleeve 2 to the wall through the first blade 3.

In summary, the use method of the anchor rod of the embodiment is as follows:

the first end of the sleeve 2 is inserted into the anchor hole in the wall, the fixing block 8 is arranged in the sleeve 2, the screw rod 1 is inserted into the sleeve 2, and the third end of the screw rod 1 is closer to the second end of the sleeve 2 than the fourth end. Promote screw rod 1, make screw rod 1 to the direction removal that is close to first end, thereby the screw rod promotes fixed block 8 and removes to sleeve pipe 2's first end, reach sleeve pipe 2's first end up to fixed block 8, thereby fixed block 8 makes second blade 4 pass through the spacing hole protrusion in sleeve pipe 2's outer peripheral face of second, consequently, second blade 4 can inject in the wall, it is internal to realize that sleeve pipe 2 is fixed in the wall, wherein, screw rod 1 is to the in-process that the direction that is close to first end removed, spacing arch 5 on the screw rod 1 slides along spacing groove 6, consequently spacing groove 6 provides the guide effect for screw rod 1's removal, avoid screw rod 1 to rock at the in-process that removes, and first blade 3 slides along the first direction in blade groove 7.

The screw rod 1 is pulled, the screw rod 1 is made to move towards the direction far away from the first end, and the fixing block 8 always supports the second blade 4, so that the second blade 4 is always firmly grabbed in the wall body, and the sleeve 2 is still fixed in the wall body in the process of pulling the screw rod 1; in the process of pulling the screw 1, the first blade 3 slides in the blade groove 7 along the second direction (the second direction is opposite to the first direction) until the first blade 3 is separated from the blade groove 7 and slides between the blade groove 7 and the limiting groove 6, and at the moment, the first blade 3 protrudes out of the outer peripheral surface of the sleeve 2 through the first limiting hole 21, so that the first blade 3 is inserted into the wall body to provide a holding force for anchoring the sleeve 2 in the wall body, and the sleeve 2 is fixed in the wall body; simultaneously, the face that spacing arch 5 is close to first end and the wall butt that spacing groove 6 is close to the third end make screw rod 1 can not continue to pull out from sleeve pipe 2, have realized sleeve pipe 2 to screw rod 1 spacing and fixed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. A rock bolt, characterized by comprising a screw (1) and a sleeve (2);

a first limiting hole (21) is formed in the peripheral wall of the sleeve (2), a first blade (3) is connected in the first limiting hole (21), and the first blade (3) protrudes out of the inner peripheral surface of the sleeve (2);

the screw (1) is inserted into the sleeve (2), and when the screw (1) moves in the sleeve (2) along the axis direction of the screw, the screw (1) can push the first blade (3) to protrude out of the outer peripheral surface of the sleeve (2) through the first limiting hole (21).

2. A rock bolt according to claim 1, wherein the first vane (3) comprises, in the radial direction of the sleeve (2), a first face and a second face which correspond, the first face being close to the axis of the sleeve (2) relative to the second face; the screw rod (1) is inserted into the sleeve (2), and when the screw rod (1) is static relative to the sleeve (2), the second surface does not protrude out of the peripheral surface of the sleeve (2).

3. A rock bolt according to claim 2, wherein the first vane (3) comprises first and second connected portions (31, 32); the surface of the first part (31) far away from the second part (32) is the second surface, and the surface of the second part (32) far away from the first part (31) is the first surface; the area of the first face is smaller than the area of the second face.

4. The anchor rod according to claim 1, wherein the sleeve (2) has a plurality of first limiting holes (21), and each first limiting hole (21) is provided with the first blade (3); the first limiting holes (21) are uniformly distributed on the sleeve (2) along the axial direction of the sleeve (2), and the first limiting holes (21) are arranged on the sleeve (2) in a staggered mode along the circumferential direction of the sleeve (2).

5. A rock bolt according to claim 1, wherein the sleeve (2) includes first and second corresponding ends in its axial direction; the screw (1) comprises a third end and a fourth end which correspond to each other along the axial direction of the screw;

a limiting bulge (5) is arranged on the inner circumferential surface of the sleeve (2), and one surface, close to the first end, of the limiting bulge (5) is vertical to the axis of the sleeve (2);

a limiting groove (6) matched with the limiting protrusion (5) is formed in the screw (1), and the limiting groove (6) extends along the axial direction of the screw (1);

the wall surface of the limiting groove (6) close to the third end is vertical to the axis of the screw (1).

6. A rock bolt according to claim 5, wherein the face of the stop lug (5) adjacent the second end is bevelled and from the second end to the first end, the bevel becoming progressively closer to the axis of the sleeve (2).

7. A rock bolt according to claim 5, characterized in that the wall surface of the retaining groove (6) near the fourth end is in smooth transition with the groove bottom of the retaining groove (6).

8. The anchor rod according to claim 5, wherein two wall surfaces of the limiting groove (6) along the circumferential direction of the sleeve (2) are perpendicular to the groove bottom of the limiting groove (6), and the limiting protrusion (5) is matched with the limiting groove (6).

9. A rock bolt according to any one of claims 5 to 8, further including a fixing block (8);

a second limiting hole is formed in the peripheral wall, close to the first end, of the sleeve (2), a second blade (4) is connected into the second limiting hole, and the second blade (4) protrudes out of the inner peripheral surface of the sleeve (2);

the fixing block (8) is inserted into the sleeve (2) and located on one side, close to the first end, of the screw rod (1), the screw rod (1) pushes the fixing block (8) to move towards the first end, and the fixing block (8) can push the second blade (4) to protrude out of the outer peripheral face of the sleeve (2) through the second limiting hole.

10. The anchor rod of claim 9, wherein the screw rod (1) is provided with a vane groove (7) matched with the first vane (3), and the vane groove (7) and the limit groove (6) are arranged at intervals along the axial direction of the screw rod (1);

when one surface of the limiting protrusion (5) close to the first end is abutted against the wall surface of the limiting groove (6) close to the third end, the first blade (3) is located between the blade groove (7) and the limiting groove (6).