A push-pull expansion shell type anchor head

Abstract

The utility model relates to the technical field of anchor bolt anchoring, and specifically to a push-pull expansion shell type anchor head, comprising an expansion shell inner wedge and two arc-shaped expansion shell sheets, the inner side of the expansion shell inner wedge has an internal thread, the internal thread is used to connect the external thread of the anchor end, the lower part of the expansion shell inner wedge can penetrate into the two expansion shell sheets to make the two expansion shell sheets open, the expansion shell sheets have anchor teeth on the outside, each expansion shell sheet is used to be connected with an axial bar at one end close to the expansion shell inner wedge, the axial bar is axially arranged along the expansion shell sheet, the axial bar is connected with a lever bar at one end away from the expansion shell sheet, the end of the lever bar is radially inward toward the expansion shell sheet and is arranged away from the expansion shell sheet, and the end of the expansion shell inner wedge is used to be away from the expansion shell sheet and can abut against the lever bar. The anchor rod pushes the push-pull expansion shell type anchor head to enter the anchor hole more smoothly, and when the push-pull expansion shell type anchor head is pushed to the bottom of the anchor rod, the two expansion shell sheets can be initially opened, so that the anchor teeth on the outside of the expansion shell sheet can be anchored on the side wall of the anchor hole, thereby improving the success rate of the push-pull expansion shell type anchor head anchoring.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor rod anchoring, in particular to a push-pull expansion shell type anchor head. Background Art

[0002] Anchor rods are the most basic component of tunnel support in contemporary coal mines. They reinforce the surrounding rock of the tunnel. One of the main forms of reinforcing the strata or rock formations is to insert anchor rods into the rock formations for support. Anchor rods are now not only used in mines, but also in engineering technology to reinforce the main body of slopes, tunnels, and dams. With the continuous development of geotechnical engineering technology, various improvements have been made to the structure of anchor rods. The anchor head is located at the front end of the anchor rod, which is an important component for the entire anchor rod to form support force in the rock formation.

[0003] The patent document with announcement number CN220789741U discloses a push-pull mechanical anchor head, an expansion shell inner wedge and expansion shell sheets symmetrically arranged on both sides of the expansion shell inner wedge, the expansion shell inner wedge is provided with an internal thread adapted to the anchor rod, and also includes two right-angle bars, one end of the right-angle bar is connected to the expansion shell sheet, and the other end of the right-angle bar is freely arranged toward the other right-angle bar; the two right-angle bars form a split clamping strip. The anchor head of the utility model is provided with a split clamping strip, and when the expansion shell sheet expands, the clamping strip will not affect or interfere with the expansion shell sheets on both sides, and the expansion of the expansion shell sheet is easy. The integrated right-angle bar and the expansion shell sheet do not need to be fixed by welding or additional fixings, which can reduce assembly costs. The working principle of the above-mentioned push-pull mechanical anchor head is: the threaded end of the anchor rod first passes through the two expansion shell pieces and then enters the inner side of the expansion shell inner wedge. The anchor rod is fixedly connected to the expansion shell inner wedge by rotating the anchor rod, and then the expansion shell inner wedge is pushed. The expansion shell inner wedge pushes the right-angle bar and then pushes the expansion shell piece, so that the push-pull mechanical anchor head is pushed to the bottom of the anchor hole as a whole and forms a preliminary anchor. Then it is pulled outward (toward the expansion shell piece) so that the expansion shell inner wedge squeezes the space between the two expansion shell pieces, and finally the two expansion shell pieces are anchored on the side wall of the anchor hole. Under the action of the expansion shell inner wedge, the anchor rod is axially and radially limited by the two expansion shell pieces to form an anchoring effect. This anchoring method, because the initial anchoring mainly relies on the right-angle bar embedded in the bottom of the anchor hole and the friction between the external thread of the expansion shell and the side wall of the anchor hole, but when pulling outward (toward the expansion shell) so that the inner wedge of the expansion shell squeezes the space between the two expansion shells, the external thread of the expansion shell and the side wall of the anchor hole may not generate friction, which may make it possible to pull out the push-pull mechanical anchor head as a whole, resulting in anchor failure. Utility Model Content

[0004] The purpose of the utility model is to overcome the push-pull type mechanical anchor head in the prior art, in which the initial anchoring mainly relies on the right-angle bar embedded in the bottom of the anchor hole and the friction between the external thread of the expansion shell piece and the side wall of the anchor hole. However, when the expansion shell is pulled outward to squeeze the space between the two expansion shell pieces, the external thread of the expansion shell piece and the side wall of the anchor hole may not be able to generate friction, so that the push-pull type mechanical anchor head may be pulled out as a whole, which easily leads to the deficiency of anchoring failure, and provides a push-pull expansion shell type anchor head.

[0005] The utility model provides a push-pull expansion shell type anchor head, comprising an expansion shell inner wedge and two arc-shaped expansion shell sheets, the inner side of the expansion shell inner wedge is provided with an internal thread, the internal thread is used to connect the external thread at the end of the anchor rod, the lower part of the expansion shell inner wedge can penetrate into between the two expansion shell sheets so that the two expansion shell sheets are spread apart, the outer side of the expansion shell sheets is provided with anchoring teeth, each of the expansion shell sheets is connected to an axial bar at one end close to the expansion shell inner wedge, the axial bar is axially arranged along the expansion shell sheet, the end of the axial bar away from the expansion shell sheet is connected to a lever bar, the end of the lever bar is arranged radially inward toward the expansion shell sheet and away from the expansion shell sheet, and the end of the expansion shell inner wedge is used to abut against the lever bar.

[0006] In this scheme, the lower part of the expansion shell inner wedge can penetrate into the space between the two expansion shell pieces so that the two expansion shell pieces are stretched apart, that is, the two expansion shell pieces can be arranged on both sides of the expansion shell inner wedge, and the expansion shell inner wedge can continuously enter between the two expansion shell pieces. After entering, as the support increases, the distance between the two expansion shell pieces increases, thereby enabling the two expansion shell pieces to be stretched apart, such as: the part where the expansion shell inner wedge first enters between the two expansion shell pieces is truncated cone or conical, and the end of the two expansion shell pieces that is first entered by the expansion shell inner wedge is also truncated cone or conical, that is, it can be achieved; of course, this design exists in the push-pull expansion shell type anchor head in the prior art, wherein the inner side of the expansion shell inner wedge has an internal thread, and the internal thread is used to connect the external thread at the end of the anchor rod, and the outer side of the expansion shell piece has anchoring teeth, which are all characteristics of the push-pull expansion shell anchor head.

[0007] In the present scheme, an axial bar is connected to one end of each expansion shell piece close to the expansion shell inner wedge, the axial bar is axially arranged along the expansion shell piece, and a lever bar is connected to one end of the axial bar away from the expansion shell piece, and the end of the lever bar is radially inward toward the expansion shell piece and arranged away from the expansion shell piece, so that when a push-pull expansion shell type anchor head is used, the anchor rod passes through between the two expansion shell pieces and is connected to the internal thread of the expansion shell inner wedge to form a whole, and the push-pull expansion shell type anchor head is placed in the anchor hole through the anchor rod, and the expansion shell inner wedge is pushed by the anchor rod, and the end of the expansion shell inner wedge away from the expansion shell piece can abut against the lever bar, so that the expansion shell inner wedge can push the lever bar to drive the expansion shell piece to go deep into the anchor hole, and because the expansion shell inner wedge supports the lever bar, the push-pull expansion shell type anchor head can be placed in the anchor hole with the anchor rod. The supporting point of the lever bar by the inner wedge of the expansion shell is the center of rotation, and the two expansion shell pieces will be close to each other, thereby making the radial range formed by the two expansion shell pieces smaller, and the anchoring teeth on the outside of the expansion shell pieces basically will not squeeze the side wall of the anchor hole, so that the push-pull expansion shell type anchor head is pushed into the anchor hole more smoothly; when the push-pull expansion shell type anchor head is pushed to the bottom of the anchor hole, the end of the lever bar will abut the bottom of the anchor hole, at this time, the end position of the lever bar remains unchanged, and the lever bar is still abutted by the inner wedge of the expansion shell, so that the lever bar rotates with the end position of the lever bar as the base point, and the two expansion shell pieces will rotate away, so that the anchoring teeth on the outside of the expansion shell piece will be initially anchored to the side wall of the anchor hole, providing a greater initial anchoring force for the subsequent pulling out of the inner wedge of the expansion shell to make the two expansion shell pieces open, which is conducive to ensuring the success rate of anchoring.

[0008] Preferably, the end of the lever bar is connected to a radial bar to increase axial limit protection and prevent the inner wedge of the expansion shell from sliding out of the end of the lever bar.

[0009] Preferably, an anchoring protrusion is provided on a side of the radial strip away from the expansion shell sheet, and the anchoring protrusion can penetrate into the bottom of the anchor hole, which can further increase the initial anchoring force and help ensure the success rate of anchoring.

[0010] Preferably, the shell expansion piece, axial bar, lever bar, radial bar and anchoring protrusion are an integrated structure with high structural strength and more stable and safe use.

[0011] Preferably, the angle between the lever bar and the expansion shell piece is 5°-15°, which is conducive to completing the rotational transformation and providing a greater initial anchoring force for subsequently pulling out the inner wedge of the expansion shell to open the two expansion shell pieces.

[0012] Preferably, the inner wedge of the expansion shell is used to abut one end of the lever bar close to the axial bar at one end away from the expansion shell sheet, so that the two expansion shell sheets can be initially anchored to a greater extent, providing a greater initial anchoring force for subsequently pulling out the inner wedge of the expansion shell to open the two expansion shell sheets.

[0013] Preferably, the axial strip is connected to the expansion shell piece to be close to one end surface of the expansion shell inner wedge, so as to avoid occupying the area of ​​the expansion shell piece used for setting the anchoring teeth, thereby improving the anchoring force.

[0014] Preferably, the outer side of one end of the expansion shell inner wedge close to the expansion shell piece has an outer convex sliding surface, and the inner side of one end of the expansion shell piece close to the expansion shell inner wedge has an inner concave sliding surface, and the outer convex sliding surface can adapt and move along the inner concave sliding surface to facilitate the expansion shell inner wedge to enter between the two expansion shell pieces and spread the two expansion shell pieces apart.

[0015] Preferably, the outer side of the inner wedge of the expansion shell is further provided with circumferential limiting ribs arranged at circumferential intervals, and the expansion shell piece is arranged between two adjacent circumferential limiting ribs, and the circumferential limiting ribs can guide the axial relative movement of the expansion shell piece.

[0016] The circumferential limiting ribs can prevent the inner wedge of the expansion shell and the expansion shell sheet from rotating relative to each other, and can make the inner wedge of the expansion shell enter between the two expansion shell sheets more smoothly.

[0017] Preferably, a locking structure is provided at the junction of the two expansion shell pieces, the locking structure comprises a slot and a locking protrusion, the slot and the locking protrusion can be adapted to form an axial limit, and the slot and the locking protrusion are respectively provided on the two expansion shell pieces.

[0018] By the axial limit formed by the clamping grooves and the locking protrusions of the two expansion shell pieces, when the inner wedge of the expansion shell is pushed by the anchor rod, the two expansion shell pieces can be better driven to go deep into the anchor hole together.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a push-pull expansion shell type anchor head, wherein an axial strip is connected to one end of each expansion shell piece close to the expansion shell inner wedge, the axial strip is axially arranged along the expansion shell piece, and the end of the axial strip away from the expansion shell piece is connected to a lever strip, and the end of the lever strip is radially inward toward the expansion shell piece and arranged away from the expansion shell piece, so that when the push-pull expansion shell type anchor head is used, the anchor rod passes through between the two expansion shell pieces and is connected to the internal thread of the expansion shell inner wedge to form a whole, the push-pull expansion shell type anchor head is placed in the anchor hole through the anchor rod, the expansion shell inner wedge is pushed by the anchor rod, and the end of the expansion shell inner wedge away from the expansion shell piece can abut against the lever strip, so that the expansion shell inner wedge can push the lever strip to drive the expansion shell piece to go deep into the anchor hole, and because the expansion shell inner wedge supports the lever strip, the push-pull expansion shell type anchor head can be placed in the anchor hole. The two expansion shell pieces will be closer to each other with the support point of the lever bar on the expansion shell inner wedge as the rotation center, thereby making the radial range formed by the two expansion shell pieces smaller, and the anchoring teeth on the outside of the expansion shell piece will basically not squeeze the side wall of the anchor hole, so that the push-pull expansion shell type anchor head can be pushed into the anchor hole more smoothly; when the push-pull expansion shell type anchor head is pushed to the bottom of the anchor hole, the end of the lever bar will abut the bottom of the anchor hole, at this time, the end position of the lever bar remains unchanged, and the lever bar is still abutted by the expansion shell inner wedge, so that the lever bar rotates with the end position of the lever bar as the base point, thereby making the two expansion shell pieces rotate away, thereby making the anchoring teeth on the outside of the expansion shell piece initially anchored to the side wall of the anchor hole, providing a greater initial anchoring force for the subsequent pulling out of the expansion shell inner wedge to make the two expansion shell pieces open, which is beneficial to ensuring the success rate of anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the push-pull shell-expanding anchor head described in the utility model is shown in FIG. Figure 1 ;

[0022] Figure 2 It is a schematic diagram of the structure of the inner wedge of the expansion shell;

[0023] Figure 3 It is a schematic diagram of the internal thread of the inner wedge of the expansion shell;

[0024] Figure 4 It is a structural schematic diagram of the expansion shell piece;

[0025] Figure 5 It is a schematic diagram of the outer side of the expansion shell piece;

[0026] Figure 6 It is a schematic diagram of the anchor rod pushing the push-pull expansion shell anchor head into the anchor hole;

[0027] Figure 7 It is a schematic diagram of the anchor rod pushing the push-pull expansion shell anchor head into the bottom of the anchor hole and forming a preliminary anchoring;

[0028] Figure 8This is a schematic diagram of the structure of the push-pull shell-expanding anchor head described in the utility model. Figure 2 ;

[0029] Fig. 9 This is a schematic diagram of the structure of the push-pull shell-expanding anchor head described in the utility model. Figure 3 ;

[0030] Fig.10 This is a schematic diagram of the structure of the push-pull shell-expanding anchor head described in the utility model. Figure 4 .

[0031] Markings in the figure: 1. Wedge inside the expansion shell; 11-internal thread; 12. Circumferential limiting ribs; 13. External convex sliding surface; 2. Expansion shell sheet; 21-axial bar; 22. Lever bar; 23. Anchoring tooth; 24. Radial bar; 25. Anchoring protrusion; 26. Inner concave sliding surface; 261. Locking protrusion; 262. Slot; 3. Anchor hole; 4. Anchor rod. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0033] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0035] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0036] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0037] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0038] Example 1

[0039] like Figure 1-5 As shown, this embodiment provides a push-pull expansion shell anchor head, including an expansion shell inner wedge 1 and two arc-shaped expansion shell sheets 2. The inner side of the expansion shell inner wedge 1 has an internal thread 11, and the internal thread 11 is used to connect the external thread at the end of the anchor rod 4. The lower part of the expansion shell inner wedge 1 can penetrate between the two expansion shell sheets 2 so that the two expansion shell sheets 2 are stretched apart. The outer side of the expansion shell sheet 2 has an anchoring tooth 23. In this embodiment, the expansion shell sheet 2 and the expansion shell inner wedge 1 are both axially Figure 1 The vertical direction is Figure 1 left and right direction.

[0040] like Figure 1 As shown, the lower part of the expansion shell inner wedge 1 can penetrate into the space between the two expansion shell sheets 2, so that the two expansion shell sheets 2 are stretched open, that is, the two expansion shell sheets 2 can be arranged on both sides of the expansion shell inner wedge 1, and the expansion shell inner wedge 1 can continuously enter between the two expansion shell sheets 2, that is, Figure 1 In the expansion shell, the inner wedge 1 moves downward. After entering, as the support of the inner wedge 1 increases, the distance between the two expansion shell pieces 2 increases, so that the two expansion shell pieces 2 can be stretched apart, such as: the part where the inner wedge 1 first enters between the two expansion shell pieces 2 is truncated cone or conical, such as Figure 2 As shown, the upper end of the expansion shell inner wedge 1 is large and the lower end is small, and the lower end of the expansion shell inner wedge 1 first enters between the two expansion shell sheets 2; correspondingly, Figure 4 As shown, the cavity between the two expansion shell pieces 2 is small at the upper end and large at the lower end, which is adapted to the expansion shell inner wedge 1. The end of the two expansion shell pieces 2 that is first entered by the expansion shell inner wedge 1 is also truncated or conical, that is, it can be realized; of course, this design exists in the push-pull expansion shell anchor head of the prior art, wherein the inner side of the expansion shell inner wedge 1 has an internal thread 11, and the internal thread 11 is used to connect the external thread at the end of the anchor rod 4, and the outer side of the expansion shell piece 2 has anchor teeth 23, which are all features of the push-pull expansion shell anchor head. For example, the internal thread 11 of the expansion shell inner wedge 1 and the external thread at the end of the anchor rod 4 are both 8mm pitch, which can be adapted to threaded connection, and the anchor rod can be a hollow grouting anchor rod. The anchor teeth 23 on the outside of the expansion shell piece 2 can also be circumferentially disconnected threads, such as threads with a pitch of 12.7mm.

[0041] In this embodiment, Figure 2 and Figure 4 As shown, the outer side of one end of the expansion shell inner wedge 1 used to be close to the expansion shell piece 2 has an outer convex sliding surface 13, and the inner side of one end of the expansion shell piece 2 used to be close to the expansion shell inner wedge 1 has an inner concave sliding surface 26, and the outer convex sliding surface 13 can adapt and move along the inner concave sliding surface 26 to facilitate the expansion shell inner wedge 1 to enter between the two expansion shell pieces 2 and spread the two expansion shell pieces 2 apart.

[0042] like Figure 2 As shown, the outer side of the expansion shell inner wedge 1 is also provided with circumferentially spaced circumferential limiting ribs 12, and the expansion shell sheet 2 is arranged between two adjacent circumferential limiting ribs 12, and the two expansion shell sheets 2 are arranged opposite to each other, that is, Figure 2 On the left and right sides of the expansion shell, the circumferential limiting ribs 12 can guide the axial relative movement of the expansion shell piece 2. The circumferential limiting ribs 12 can prevent the expansion shell inner wedge 1 and the expansion shell piece from rotating relative to each other, and can make the expansion shell inner wedge 1 enter between the two expansion shell pieces 2 more smoothly.

[0043] In this embodiment, each of the expansion shell pieces 2 is connected to an axial strip 21 at one end close to the expansion shell inner wedge 1, and the axial strip 21 is axially arranged along the expansion shell piece 2. The end of the axial strip 21 away from the expansion shell piece 2 is connected to a lever strip 22, and the end of the lever strip 22 is radially inward toward the expansion shell piece 2 and away from the expansion shell piece 2. When the push-pull expansion shell type anchor head is used, the anchor rod passes between the two expansion shell pieces 2 and is connected to the internal thread 11 of the expansion shell inner wedge 1 to form a whole. The push-pull expansion shell type anchor head is placed at the anchor hole through the anchor rod, and the expansion shell inner wedge 1 is pushed by the anchor rod. The expansion shell inner wedge 1 is used to abut the lever bar 22 at one end away from the expansion shell piece 2, so that the expansion shell inner wedge 1 can push the lever bar 22 to drive the expansion shell piece 2 to go deep into the anchor hole, and because the expansion shell inner wedge 1 supports the lever bar 22, the two expansion shell pieces 2 can be close to each other with the support point of the expansion shell inner wedge 1 on the lever bar 22 as the rotation center, thereby making the radial range formed by the two expansion shell pieces 2 smaller, and the anchoring teeth 23 on the outside of the expansion shell piece 2 basically do not squeeze the side wall of the anchor hole, so that the push-pull expansion shell type anchor head is pushed into the anchor hole more smoothly. Figure 6 shown.

[0044] like Figure 7 As shown, when the push-pull expansion shell type anchor head is pushed to the bottom of the anchor hole, the end of the lever bar 22 will abut the bottom of the anchor hole. At this time, the end position of the lever bar 22 remains unchanged, and the lever bar 22 is still abutted by the expansion shell inner wedge 1, so that the lever bar 22 rotates with the end position of the lever bar 22 as the base point, so that the two expansion shell pieces 2 will rotate away, so that the anchoring teeth 23 on the outside of the expansion shell piece 2 will be initially anchored on the side wall of the anchor hole, so as to provide a greater initial anchoring force for the subsequent pulling out of the expansion shell inner wedge 1 to make the two expansion shell pieces 2 open, which is conducive to ensuring the success rate of anchoring.

[0045] In one or more embodiments, the lever bar 22 is a curved surface structure or an inclined surface structure. Figure 1 As shown, the lever bar 22 is a slope structure, that is, an inclined bar. Wherein, the arc surface structure is not shown, but the working principle is the same, both utilizing the lever principle.

[0046] In one or more embodiments, Figure 8 As shown, radial direction refers to Figure 8 In the left and right directions, the end of the lever bar 22 is connected with a radial bar 24 to increase axial limit protection and prevent the inner wedge 1 of the expansion shell from slipping out from the end of the lever bar 22.

[0047] Further, such as Fig. 9As shown, the radial strip 24 is provided with an anchoring protrusion 25 on one side away from the expansion shell sheet 2. The anchoring protrusion 25 can penetrate into the bottom of the anchor hole, further increasing the initial anchoring force and ensuring the success rate of anchoring. The anchoring protrusion 25 can be a structure with a pointed tip, which makes it easier to anchor into the bottom of the anchor hole.

[0048] Furthermore, the expansion shell piece 2, the axial strip 21, the lever strip 22, the radial strip 24 and the anchoring protrusion 25 are an integrated structure, which has high structural strength and is more stable and safe to use.

[0049] In one or more embodiments, the angle between the lever bar and the axial direction of the expansion shell piece is 5°-15°, which is conducive to completing the rotational transformation and providing a greater initial anchoring force for subsequently pulling out the inner wedge of the expansion shell to open the two expansion shell pieces.

[0050] In one or more embodiments, the inner wedge of the expansion shell is used to abut one end of the lever bar close to the axial bar at one end away from the expansion shell sheet, so that the two expansion shell sheets can be initially anchored to a greater degree, providing a greater initial anchoring force for subsequently pulling out the inner wedge of the expansion shell to open the two expansion shell sheets.

[0051] In one or more embodiments, Figure 1 As shown, the axial strip 21 connects the expansion shell piece 2 to be close to one end surface of the expansion shell inner wedge 1, avoiding occupying the area of ​​the expansion shell piece 2 for setting the anchoring teeth 23, thereby improving the anchoring force.

[0052] In one or more embodiments, Fig.10 As shown, a locking structure is provided at the junction of the two expansion shell pieces 2, and the locking structure includes a slot 262 and a locking protrusion 261, and the slot 262 and the locking protrusion 261 can be adapted to form an axial limit, and the slot 262 and the locking protrusion 261 are respectively provided on the two expansion shell pieces 2. The axial limit formed by the slot 262 and the locking protrusion 261 of the two expansion shell pieces 2 can better drive the two expansion shell pieces 2 to go deep into the anchor hole when the expansion shell inner wedge 1 is pushed by the anchor rod. And the number of the locking structures can be selected, and they can be arranged at intervals in the axial direction of the expansion shell piece 2.

[0053] The push-pull expansion shell type anchor head provided in the present embodiment makes it easier for the anchor rod to push the push-pull expansion shell type anchor head into the anchor hole. When the anchor rod pushes the push-pull expansion shell type anchor head to reach the bottom of the anchor rod, the two expansion shell pieces 2 can be initially expanded, so that the anchoring teeth on the outside of the expansion shell piece 2 can be anchored on the side wall of the anchor hole, thereby providing a more stable initial anchoring force for the anchor rod to pull out the expanded shell piece 2, thereby improving the success rate of anchoring of the push-pull expansion shell type anchor head.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A push-pull expansion shell anchor head, comprising an expansion shell inner wedge (1) and two arc-shaped expansion shell sheets (2), wherein the inner side of the expansion shell inner wedge (1) has an internal thread (11), and the internal thread (11) is used to connect the external thread of the end of the anchor rod (4), and the lower part of the expansion shell inner wedge (1) can penetrate between the two expansion shell sheets (2) so that the two expansion shell sheets (2) are spread apart, and the outer side of the expansion shell sheet (2) has anchor teeth (23), characterized in that: Each of the expansion shell sheets (2) is connected to an axial bar (21) at one end close to the expansion shell inner wedge (1); the axial bar (21) is arranged axially along the expansion shell sheet (2); the end of the axial bar (21) away from the expansion shell sheet (2) is connected to a lever bar (22); the end of the lever bar (22) is arranged radially inward toward the expansion shell sheet (2) and away from the expansion shell sheet (2); the end of the expansion shell inner wedge (1) away from the expansion shell sheet (2) can abut against the lever bar (22).

2. A push-pull shell-expanding anchor head according to claim 1, characterized in that: The end of the lever bar (22) is connected to a radial bar (24).

3. A push-pull shell-expanding anchor head according to claim 2, characterized in that: An anchoring protrusion (25) is provided on a side of the radial strip (24) away from the expansion shell sheet (2).

4. A push-pull shell-expanding anchor head according to claim 3, characterized in that: The expansion shell sheet (2), the axial strip (21), the lever strip (22), the radial strip (24) and the anchoring protrusion (25) are an integrated structure.

5. The push-pull shell-expanding anchor head according to claim 1, characterized in that: The axial included angle between the lever bar (22) and the expansion shell sheet (2) is 5°-15°.

6. A push-pull shell-expanding anchor head according to claim 1, characterized in that: The expansion shell inner wedge (1) is used for abutting against an end of the lever bar (22) close to the axial bar (21) at one end away from the expansion shell sheet (2).

7. A push-pull expansion shell anchor head according to any one of claims 1-6, characterized in that: The axial strip (21) is connected to the expansion shell sheet (2) and is used to be close to an end surface of the expansion shell inner wedge (1).

8. A push-pull expansion shell anchor head according to any one of claims 1-6, characterized in that: The lever bar (22) is a curved surface structure or an inclined surface structure.

9. A push-pull expansion shell anchor head according to any one of claims 1-6, characterized in that: The outer side of one end of the expansion shell inner wedge (1) close to the expansion shell sheet (2) has an outer convex sliding surface (13), and the inner side of one end of the expansion shell sheet (2) close to the expansion shell inner wedge (1) has an inner concave sliding surface (26), and the outer convex sliding surface (13) can adapt and move along the inner concave sliding surface (26); and / or, The outer side of the expansion shell inner wedge (1) is also provided with circumferential limiting ribs (12) arranged at circumferential intervals, and the expansion shell piece (2) is arranged between two adjacent circumferential limiting ribs (12). The circumferential limiting ribs (12) can guide the axial relative movement of the expansion shell piece (2).

10. A push-pull expansion shell anchor head according to any one of claims 1-6, characterized in that: A locking structure is provided at the junction of the two expansion shell sheets (2), the locking structure comprising a locking groove (262) and a locking protrusion (261), the locking groove (262) and the locking protrusion (261) being adaptable to form an axial limit, and the locking groove (262) and the locking protrusion (261) are respectively provided on the two expansion shell sheets (2).

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