Self-locking friction anchor rod and method of using the same

Abstract

The disclosed embodiments relate to a self-locking friction anchor and its use method. The self-locking friction anchor comprises: a self-locking sleeve having a backing plate at the first end, and a plurality of cutouts on the wall of the self-locking sleeve at the second end; a friction sleeve partially sleeved within the self-locking sleeve, the friction sleeve being proximal to the first end of the self-locking sleeve, the friction sleeve being inserted into the backing plate, and a baffle being provided at one end of the friction sleeve within the self-locking sleeve; a fixing member being rotatably mounted on the wall of the friction sleeve outside the self-locking sleeve, and capable of moving the self-locking sleeve toward the second end of the self-locking sleeve when the fixing member rotates; an anchor rod being disposed within the self-locking sleeve, the first end of the anchor rod being movably connected to the friction sleeve via a piston, the anchor rod being inserted into the baffle, and a self-locking head being provided at the second end of the anchor rod; a first elastic member being disposed between the backing plate and the piston, and a second elastic member being disposed between the piston and the baffle. The disclosed embodiments can adapt to the deformation of the surrounding rock, deforming synchronously with the surrounding rock, and delaying the fracture and failure of the anchor rod.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of soft rock anchoring, and in particular to a self-locking friction anchor rod and a method for using the same. Background Art

[0002] When carrying out construction in soft rock environments such as mines and tunnels, the excavation of soft rock environments will cause the deformation energy of the surrounding rock to be released into the free space. As the mining depth continues to increase, it is very important to support the surrounding rock of the tunnel to ensure the smooth progress of the underground project. Anchor rods, as a commonly used support equipment in underground projects, can effectively regulate the bearing capacity of the surrounding rock itself. However, when the tunnel is buried deep, the surrounding rock will undergo large deformations. At this time, the existing anchor rods cannot meet the support requirements due to their own limitations, resulting in the breakage and failure of the anchor rods, and the loss of support significance. In addition, in related technologies, the installation process of anchor rods is relatively complicated, especially in the case of upward anchoring, most of which require special installation equipment, which is extremely inconvenient when used.

[0003] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0004] It should be noted that this section is intended to provide background or context for the technical solutions of the present disclosure stated in the claims. The description herein is not admitted to be prior art by virtue of being included in this section. Summary of the Invention

[0005] The purpose of the embodiments of the present disclosure is to provide a self-locking friction anchor and a method of using the same, thereby overcoming one or more problems caused by the limitations and defects of the related art, at least to a certain extent.

[0006] According to a first aspect of an embodiment of the present disclosure, there is provided a self-locking friction anchor rod, comprising:

[0007] Self-locking sleeves, friction sleeves, fixings and anchor rods;

[0008] The first end of the self-locking sleeve is provided with a backing plate, and the wall of the second end of the self-locking sleeve is provided with a plurality of cutouts;

[0009] The friction sleeve is partially sleeved in the self-locking sleeve, and the friction sleeve is close to the first end of the self-locking sleeve. The friction sleeve is passed through the pad, and a baffle is provided at one end of the friction sleeve in the self-locking sleeve.

[0010] The fixing member is rotatably mounted on the outer wall of the friction sleeve of the self-locking sleeve, and when the fixing member rotates, the self-locking sleeve can move toward the second end of the self-locking sleeve;

[0011] The anchor rod is arranged in the self-locking sleeve, the first end of the anchor rod is movably connected to the friction sleeve through a piston, and the anchor rod is passed through the baffle, and the second end of the anchor rod is provided with a self-locking head;

[0012] Wherein, a first elastic member is provided between the pad and the piston, and a second elastic member is provided between the piston and the baffle.

[0013] In one embodiment of the present disclosure, the first elastic member is a first spring, and the second elastic member is a second spring.

[0014] In one embodiment of the present disclosure, the second spring is sleeved on the anchor rod; or,

[0015] The second spring is arranged between the anchor rod and the inner wall of the friction sleeve along the axial direction of the anchor rod.

[0016] In one embodiment of the present disclosure, a plurality of grooves are provided on the outer wall of the friction sleeve along the circumferential direction.

[0017] In one embodiment of the present disclosure, a plurality of snap mechanisms matching the groove are provided in the backing plate, and the snap mechanisms are provided at the connection between the backing plate and the friction sleeve, so that when the backing plate moves to the groove of the friction sleeve, the snap mechanisms can fix the friction sleeve.

[0018] In one embodiment of the present disclosure, the buckle mechanism includes:

[0019] a third elastic member and a clamping column;

[0020] The third elastic member is a third spring, one end of the third spring is connected to the pad, and the other end is connected to the clamping column, and the diameter of the clamping column matches the diameter of the groove.

[0021] In one embodiment of the present disclosure, the first end of the self-locking head is connected to the second end of the anchor rod, and the diameter of the first end of the self-locking head is smaller than the diameter of the second end of the self-locking head.

[0022] In one embodiment of the present disclosure, the diameter of the piston matches the inner diameter of the friction sleeve, so that the friction force between the piston and the inner wall of the friction sleeve can provide a supporting force.

[0023] According to a second aspect of an embodiment of the present disclosure, a method for using a self-locking friction anchor is further provided, which is applied to any of the above-mentioned self-locking friction anchors, and the method comprises:

[0024] Installing the self-locking friction anchor rod into the drilled mounting hole;

[0025] The fixing piece is adjusted to move the self-locking sleeve into the borehole, and the cutout of the self-locking sleeve expands outward at the self-locking head and wedges into the surrounding rock, thereby completing the fixation of the self-locking friction anchor rod.

[0026] In one embodiment of the present disclosure, the fixing member is adjusted to move the backing plate and the snap mechanism into the borehole, and when the clamping column is clamped into the groove, the self-locking friction anchor rod is fixed.

[0027] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0028] In the embodiments disclosed herein, the self-locking friction anchor and its use method, on the one hand, because the self-locking friction anchor is self-locked inside the surrounding rock, it plays the role of anchoring the anchor. When the surrounding rock deforms, it generates tension or pressure on the anchor. When the tension or pressure is greater than the anchoring force of the anchor, the piston slides in the friction sleeve, and the friction generated by the piston and the inner wall of the friction sleeve provides a strong support force to offset the tension or pressure on the anchor caused by the deformation of the surrounding rock. It can adapt to the deformation of the surrounding rock, deform synchronously with the surrounding rock, and delay the fracture and failure of the anchor. When the piston and the friction sleeve are displaced to a certain distance, the anchor contacts the first spring or the second spring, and the high-strength spring enhances the support force of the anchor, achieving the effect of anchoring the surrounding rock. On the other hand, during installation, only the fixing parts need to be adjusted to complete the installation, which is simple to operate and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0030] Figure 1 A schematic diagram of a self-locking friction anchor structure in an exemplary embodiment of the present disclosure is shown;

[0031] Figure 2 Show Figure 1 Schematic diagram of the structure when the middle buckle structure is locked with the groove;

[0032] Figure 3 A flow chart showing a method for using a self-locking friction anchor in an exemplary embodiment of the present disclosure is shown.

[0033] In the figure: 100, self-locking sleeve; 110, backing plate; 120, cutout; 130, snap mechanism; 131, third elastic member; 132, clamping column; 200, friction sleeve; 210, baffle; 220, groove; 300, fixing member; 400, anchor rod; 410, piston; 420, self-locking head; 510, first elastic member; 520, second elastic member. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0035] In addition, the accompanying drawings are merely schematic illustrations of embodiments of the present disclosure and are not necessarily drawn to scale. Like reference numerals in the figures represent like or similar parts, and thus repeated descriptions thereof will be omitted. Some of the blocks shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically separate entities.

[0036] In this example embodiment, a self-locking friction anchor rod is first provided. Figure 1 As shown in , the self-locking friction anchor may include:

[0037] Self-locking sleeve 100, friction sleeve 200, fixing piece 300 and anchor rod 400; wherein, the first end of the self-locking sleeve 100 is provided with a backing plate 110, the wall of the second end of the locking sleeve is provided with a plurality of cutouts 120, the friction sleeve 200 is partially sleeved in the self-locking sleeve 100, and the friction sleeve 200 is close to the first end of the self-locking sleeve 100, the friction sleeve 200 is passed through the backing plate 110, one end of the friction sleeve 200 in the self-locking sleeve 100 is provided with a baffle 210, the friction sleeve 200 is provided with a fixing piece 300 on the wall outside the self-locking sleeve 100, and the fixing piece 300 can make the self-locking sleeve 100 rotate. Move toward the second end of the self-locking sleeve 100, the anchor rod 400 is arranged in the self-locking sleeve 100, the first end of the anchor rod 400 is movably connected to the friction sleeve 200 through the piston 410, the second end of the anchor rod 400 is provided with a self-locking head 420, a first elastic member 510 is provided between the pad 110 and the piston 410, and a second elastic member 520 is provided between the piston 410 and the baffle 210.

[0038] Through the above-mentioned self-locking friction anchor rod, the self-locking head 420 is installed at the end of the self-locking friction anchor rod, and the self-locking sleeve 100 is fixedly connected to the pad 110. After the self-locking friction anchor rod is installed, the fixing part 300 is adjusted to give the pad 110 a forward thrust. Under the action of the thrust, the self-locking sleeve 100 is pushed into the position of the self-locking head 420, causing the incision 120 of the self-locking sleeve 100 to expand and wedge into the surrounding rock. This expansion force causes the anchor rod 400 to self-lock inside the surrounding rock. Because the anchor rod 400 is self-locked within the surrounding rock, it exerts its anchoring effect. When the surrounding rock deforms, tension or pressure is applied to the anchor rod 400. When the tension or pressure exceeds the anchoring force of the anchor rod 400, the piston 410 slips within the friction sleeve 200. The friction generated between the piston 410 and the inner wall of the friction sleeve 200 provides a strong supporting force to offset the tension or pressure applied to the anchor rod 400 by the deformation of the surrounding rock. This allows the piston 410 to adapt to the deformation of the surrounding rock, deforming synchronously with the surrounding rock, and delaying the fracture and failure of the anchor rod 400. When the piston 410 and the friction sleeve 200 move to a certain distance, the first elastic member 510 or the second elastic member 520 generates elastic force. The high-strength spring further enhances the supporting force of the anchor rod 400, achieving the purpose of anchoring the surrounding rock. Installation only requires adjusting the fixing member 300 to complete the installation, which is simple to operate and greatly improves work efficiency.

[0039] Below, we will refer to Figures 1 to 3 The various parts of the self-locking friction anchor in this exemplary embodiment are described in more detail.

[0040] Optionally, in some embodiments, the first elastic member 510 is a first spring, and the second elastic member 520 is a second spring.

[0041] For example, in a specific embodiment, the first elastic member 510 is a first spring, and the second elastic member 520 is a second spring. When the surrounding rock deforms and causes the piston 410 and the friction sleeve 200 to move to a certain distance, the first spring between the piston 410 and the pad 110, or the second spring between the piston 410 and the baffle 210 is squeezed and begins to generate elastic force, preventing the piston 410 from continuing to move toward the pad 110 or the baffle 210.

[0042] Optionally, in some embodiments, the second spring is sleeved on the anchor rod 400 ; or, the second spring is arranged between the anchor rod 400 and the inner wall of the friction sleeve 200 along the axial direction of the anchor rod 400 .

[0043] For example, in one specific embodiment, one end of the second spring can be fixed to the piston 410, or to the baffle 210, or both can be unfixed and directly attached to the piston 410 and the baffle 210. When the surrounding rock deforms, causing the piston 410 and the friction sleeve 200 to move a certain distance, the second spring between the piston 410 and the baffle 210 begins to generate elastic force, preventing the piston 410 from moving further toward the baffle 210. At this time, the friction generated by the piston 410 and the friction sleeve 200 provides support for the anchor rod 400, and the second spring also provides support for the anchor rod 400, achieving the purpose of anchoring the anchor rod 400 to support the surrounding rock. The second spring is mounted on the anchor rod 400. When the second spring deforms, the anchor rod 400 can prevent the second spring from deflecting, thus protecting the second spring from damage.

[0044] Alternatively, when the second spring is not mounted on the anchor rod 400, it must be arranged along the axial direction of the anchor rod 400 to be effective; at this time, the second spring can be fixed on the piston 410 or the baffle 210 to prevent the two ends of the second spring from being squeezed at the same time and in opposite directions in the axial direction, thereby preventing the second spring from being damaged; and multiple second springs can also be arranged to increase the support force that can be provided to the anchor rod 400.

[0045] Optionally, in some embodiments, the outer wall of the friction sleeve 200 is provided with a plurality of grooves 220 along the circumferential direction.

[0046] For example, in one specific embodiment, the grooves 220 on the outer wall of the friction sleeve 200 are arranged along the circumferential direction, so that the distances between all the grooves 220 and the backing plate 110 are the same. After the self-locking sleeve 100 and the backing plate 110 move, the distances between all the grooves 220 and the backing plate 110 can be kept consistent. When the backing plate 110 moves to the grooves 220, it can simultaneously cover all the grooves 220. The distance between the grooves 220 and the backing plate 110 is a preset value, which is the same as the distance between the end of the self-locking head 420 connected to the anchor rod 400 and the bottom end of the self-locking head 420. In this way, when the backing plate 110 moves to the grooves 220, after the second end of the self-locking sleeve 100 expands, the bottom end of the cutout 120 can cover the self-locking head 420, at which point the self-locking friction anchor rod is fixed.

[0047] Optionally, in some embodiments, a plurality of snap mechanisms 130 matching the groove 220 are provided in the backing plate 110, and the snap mechanisms 130 are provided at the connection between the backing plate 110 and the friction sleeve 200, so that when the backing plate 110 moves to the groove 220 on the friction sleeve 200, the snap mechanisms 130 can fix the friction sleeve 200.

[0048] For example, in a specific embodiment, the fixing member 300 is adjusted so that the fixing member 300 pushes the pad 110 and the self-locking sleeve 100 to move. When the pad 110 moves to the groove 220, the snap mechanism 130 on the pad 110 matches the groove 220 and can be stuck in the groove 220. At this time, the fixation of the self-locking friction anchor is completed. Since the snap mechanism 130 is stuck in the groove 220, the self-locking sleeve 100 and the friction sleeve 200 cannot be displaced. When the surrounding rock is deformed, the tension or thrust generated causes the anchor rod 400 to move. The friction force generated by the piston 410 on the anchor rod 400 and the friction sleeve 200 will cause the friction sleeve 200 and the self-locking sleeve 100 to be displaced. At this time, since the snap mechanism 130 and the groove 220 fix the self-locking sleeve 100 and the friction sleeve 200 and cannot be displaced, the deformation of the surrounding rock can only cause the anchor rod 400 to move.

[0049] Optionally, in some embodiments, the snap mechanism 130 includes: a third elastic member 131 and a clamping column 132 ; one end of the third elastic member 131 is connected to the pad 110 , and the other end is connected to the clamping column 132 , and the diameter of the clamping column 132 matches the diameter of the groove 220 .

[0050] For example, in a specific embodiment, when the snap mechanism 130 is a third spring and a clamping column 132, the fixing member 300 is adjusted so that the fixing member 300 pushes the pad 110 and the self-locking sleeve 100 to move. When the pad 110 moves to the groove 220, the snap mechanism 130 on the pad 110 matches the groove 220. Therefore, the third spring uses elastic force to clamp the clamping column 132 into the groove 220, so that the self-locking sleeve 100 and the friction sleeve 200 cannot be displaced.

[0051] Optionally, in some embodiments, the first end of the self-locking head 420 is connected to the second end of the anchor rod 400 , and the diameter of the first end of the self-locking head 420 is smaller than the diameter of the second end of the self-locking head 420 .

[0052] For example, in a specific embodiment, the adjusting fixing member 300 gives the pad 110 a forward thrust. Under the action of the thrust, the self-locking sleeve 100 is pushed into the position of the self-locking head 420, so that the cutout 120 of the self-locking sleeve 100 contacts the self-locking head 420. Since the diameter of the self-locking head 420 becomes larger and larger, and the second end of the self-locking sleeve 100 is provided with a cutout 120, the second end of the self-locking sleeve 100 will expand and wedge into the surrounding rock. This expansion force causes the anchor rod 400 to self-lock inside the surrounding rock.

[0053] Optionally, in some embodiments, the diameter of the piston 410 matches the inner diameter of the friction sleeve 200 , so that the friction between the piston 410 and the inner wall of the friction sleeve 200 can provide a supporting force.

[0054] For example, in one specific embodiment, when surrounding rock deformation occurs, tension or pressure is applied to anchor rod 400. When the tension or pressure exceeds the anchoring force of anchor rod 400, piston 410 slips within friction sleeve 200. The frictional resistance generated between piston 410 and the inner wall of friction sleeve 200 provides a strong supporting force to offset the tension or pressure applied to anchor rod 400 by the deformation of the surrounding rock. If the diameter of piston 410 differs significantly from the inner diameter of friction sleeve 200, the frictional resistance generated between piston 410 and the inner wall of friction sleeve 200 will be significantly reduced, and insufficient support will be provided. Anchor rod 400 will easily expand and contract, failing to provide adequate support. Therefore, matching the diameter of piston 410 with the inner diameter of friction sleeve 200 can provide sufficient support, enabling anchor rod 400 to adapt to the deformation of the surrounding rock, deforming synchronously with the surrounding rock, and delaying fracture and failure of anchor rod 400.

[0055] This example embodiment also provides a method for using a self-locking friction anchor rod, which is applied to the self-locking friction anchor rod described in the above invention. Figure 3 As shown, the method may include steps: step S101 to step S102.

[0056] Step S101: Installing the self-locking friction anchor into the drilled installation hole;

[0057] Step S102: adjusting the fixing member 300 to move the self-locking sleeve 100 into the borehole, and the cutout 120 of the self-locking sleeve 100 expands outward at the self-locking head 420 and wedges into the surrounding rock, thereby completing the fixation of the self-locking friction anchor.

[0058] Install the self-locking friction anchor into the drilled mounting hole, adjust the fixing piece 300 to give the pad 110 a forward thrust, and under the action of the thrust, the self-locking sleeve 100 is pushed into the position of the self-locking head 420, so that the cutout 120 of the self-locking sleeve 100 contacts the self-locking head 420. As the diameter of the self-locking head 420 becomes larger and larger, and the second end of the self-locking sleeve 100 is provided with a cutout 120, the second end of the self-locking sleeve 100 will expand and wedge into the surrounding rock. When the second end of the self-locking sleeve 100 is coplanar with the other end of the self-locking head 420, the fixation of the self-locking friction anchor is completed.

[0059] Optionally, in some embodiments, the method further includes: adjusting the fixing member 300 to move the pad 110 and the snap mechanism 130 into the borehole, and when the clamping column 132 is clamped into the groove 220, the self-locking friction anchor is fixed.

[0060] For example, in a specific embodiment, the fixing member 300 pushes the pad 110 and the self-locking sleeve 100 to move. When the pad 110 moves to the groove 220, the snap mechanism 130 on the pad 110 matches the groove 220 and can be stuck in the groove 220. At this time, the fixation of the self-locking friction anchor is completed. Since the snap mechanism 130 is stuck in the groove 220, the self-locking sleeve 100 and the friction sleeve 200 cannot be displaced, thereby completing the fixation of the self-locking friction anchor.

[0061] Through the above-mentioned self-locking friction anchor rod and its use method, the self-locking head 420 is installed at the end of the self-locking friction anchor rod, and the self-locking sleeve 100 is fixedly connected to the pad 110. After the self-locking friction anchor rod is installed, the fixing part 300 is adjusted to give the pad 110 a forward thrust. Under the action of the thrust, the self-locking sleeve 100 is pushed into the position of the self-locking head 420, causing the incision 120 of the self-locking sleeve 100 to expand and wedge into the surrounding rock. This expansion force causes the anchor rod 400 to self-lock inside the surrounding rock. Because the anchor rod 400 is self-locked within the surrounding rock, it exerts its anchoring effect. When the surrounding rock deforms, tension or pressure is applied to the anchor rod 400. When the tension or pressure exceeds the anchoring force of the anchor rod 400, the piston 410 slips within the friction sleeve 200. The friction generated between the piston 410 and the inner wall of the friction sleeve 200 provides a strong supporting force to offset the tension or pressure applied to the anchor rod 400 by the deformation of the surrounding rock. This allows the piston 410 to adapt to the deformation of the surrounding rock, deforming synchronously with the surrounding rock, and delaying the fracture and failure of the anchor rod 400. When the piston 410 and the friction sleeve 200 move to a certain distance, the first spring or the second spring generates elastic force. The high-strength spring further enhances the supporting force of the anchor rod 400, achieving the purpose of anchoring the surrounding rock. Installation only requires adjusting the fixing member 300 to complete the installation, which is simple to operate and greatly improves work efficiency.

[0062] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like in the above description indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present disclosure.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] In the embodiments of the present disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," and the like should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present disclosure based on specific circumstances.

[0065] In the embodiments of the present disclosure, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0067] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A self-locking friction anchor, characterized in that: include: Self-locking sleeves, friction sleeves, fixings and anchor rods; The first end of the self-locking sleeve is provided with a backing plate, and the wall of the second end of the self-locking sleeve is provided with a plurality of cutouts; The friction sleeve is partially sleeved in the self-locking sleeve, and the friction sleeve is close to the first end of the self-locking sleeve. The friction sleeve is passed through the pad, and a baffle is provided at one end of the friction sleeve in the self-locking sleeve. The fixing member is rotatably mounted on the outer wall of the friction sleeve of the self-locking sleeve, and when the fixing member rotates, the self-locking sleeve can move toward the second end of the self-locking sleeve; The anchor rod is arranged in the self-locking sleeve, the first end of the anchor rod is movably connected to the friction sleeve through a piston, and the anchor rod is passed through the baffle, and the second end of the anchor rod is provided with a self-locking head; Wherein, a first elastic member is provided between the pad and the piston, and a second elastic member is provided between the piston and the baffle.

2. The self-locking friction anchor according to claim 1, characterized in that: The first elastic member is a first spring, and the second elastic member is a second spring.

3. The self-locking friction anchor according to claim 2, characterized in that: The second spring is sleeved on the anchor rod; or, The second spring is arranged between the anchor rod and the inner wall of the friction sleeve along the axial direction of the anchor rod.

4. The self-locking friction anchor according to claim 1, characterized in that: The outer wall of the friction sleeve is provided with a plurality of grooves along the circumferential direction.

5. The self-locking friction anchor according to claim 4, characterized in that: The backing plate is provided with a plurality of snap mechanisms matching the grooves. The snap mechanisms are provided at the connection between the backing plate and the friction sleeve so that when the backing plate moves to the groove of the friction sleeve, the snap mechanisms can fix the friction sleeve.

6. The self-locking friction anchor according to claim 5, characterized in that: The buckle mechanism comprises: a third elastic member and a clamping column; The third elastic member is a third spring, one end of the third spring is connected to the pad, and the other end is connected to the clamping column, and the diameter of the clamping column matches the diameter of the groove.

7. The self-locking friction anchor according to claim 1, characterized in that: The first end of the self-locking head is connected to the second end of the anchor rod, and the diameter of the first end of the self-locking head is smaller than the diameter of the second end of the self-locking head.

8. The self-locking friction anchor according to claim 1, characterized in that: The piston diameter matches the inner diameter of the friction sleeve so that the friction force between the piston and the inner wall of the friction sleeve can provide a supporting force.

9. A method for using a self-locking friction anchor, characterized in that: Applied to the self-locking friction anchor rod according to claim 6, the method comprises: Installing the self-locking friction anchor rod into the drilled mounting hole; The fixing piece is adjusted to move the self-locking sleeve into the borehole, and the cutout of the self-locking sleeve expands outward at the self-locking head and wedges into the surrounding rock, thereby completing the fixation of the self-locking friction anchor rod.

10. The method for using the self-locking friction anchor according to claim 9, characterized in that: The fixing member is adjusted to move the backing plate and the snap mechanism into the borehole. When the clamping column is clamped into the groove, the self-locking friction anchor rod is fixed.

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