Automatic centering ring

Abstract

The utility model discloses an automatic centering ring which is suitable for anchor rods with different diameters, convenient to install and good in centering performance. The utility model relates to an automatic centering ring which comprises an inner ring. Axial convex blocks which are uniformly distributed along the circumference are arranged on the outer circumferential surface of the inner ring; the outer surface of the axial convex block is an arc surface; one end of the axial bump is provided with a chamfer, and the other end of the axial bump is provided with a conical surface in smooth transition with the arc surface; weight reduction grooves are formed in the two sides of the axial protruding block. The inner ring is provided with an axial notch. The automatic centering ring is wider in application range, convenient to install and good in centering effect.

Description

Technical Field

[0001] The utility model relates to the field of anchor rod construction, in particular to an automatic centering ring. Background Art

[0002] An anchor rod is a tension rod composed of a steel bar or steel strand set in a drilled hole, with its end extending into the stable soil layer and a grouting body in the hole.

[0003] When the anchor rod is inserted into the borehole, a centering bracket is often required to ensure that the anchor rod is located in the center of the borehole. The centering bracket is mounted on the outside of the anchor rod and generally includes three supporting points. The supporting points contact the inner wall of the borehole. The heights of the three supporting points are consistent, forming a gap between the anchor rod and the inner wall of the borehole. Filling the gap with anchoring agent can anchor the anchor rod and the rock formation together to form a stable whole, which has an anchoring effect.

[0004] In the prior art, the centering bracket generally adopts an anchor cast steel centering ring, which has the following disadvantages:

[0005] 1. The centering ring of the anchor rod has a rigid outer diameter. If the anchor hole is small, it cannot be inserted. If the hole is large, it is relatively loose and the supporting stability is poor.

[0006] 2. For a straight-through closed inner hole, it must be put on the anchor rod first before it can be pushed into the anchor hole to support the anchor rod in the center.

[0007] 3. The diameter of the inner hole is larger than the diameter of the anchor rod, and the centering ring can slide freely up and down, which cannot achieve the position and support effect required by the project. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide an automatic centering ring which can be suitable for anchor rods with different diameters, is easy to install and has good centering performance.

[0009] The utility model solves the technical problem by adopting the following technical solution: an automatic centering ring comprises an inner ring; the outer circumferential surface of the inner ring is provided with axial protrusions evenly distributed along the circumference;

[0010] The outer surface of the axial protrusion is an arc surface; one end of the axial protrusion is provided with a chamfer, and the other end is provided with a conical surface that smoothly transitions with the arc surface;

[0011] Both sides of the axial protrusion are provided with weight-reducing grooves; and the inner ring is provided with an axial notch.

[0012] Furthermore, an extension boss is provided at one end of the inner ring; an annular groove is provided on the outer surface of the extension boss; a rotating ring is provided in the annular groove; and a notch is provided on the rotating ring.

[0013] Furthermore, the inner ring and the axial projection are both made of ABS material; the ABS is a terpolymer plastic.

[0014] Furthermore, the inner ring has five axial protrusions.

[0015] Furthermore, an anti-slip layer is provided on the inner wall of the inner ring.

[0016] Furthermore, the width of the axial notch is one sixth to one quarter of the diameter of the inner ring.

[0017] The beneficial effects of the utility model are as follows: the automatic centering ring described in the utility model has the following advantages:

[0018] 1. The automatic centering ring of the utility model has a conical surface at one end of the axial projection on the outer surface of the inner ring; thus, it has a longer sloped introduction end and good introduction performance;

[0019] 2. The automatic centering ring of the utility model is provided with axial protrusions evenly distributed along the circumference on the outer surface of the inner ring, so that the support is even in the zoom state and the centering performance is good;

[0020] 3. The inner ring of the automatic centering ring of the utility model is designed with an opening. According to the needs of the project, it can be quickly stuck on the anchor rod at any time and can fit tightly with the anchor rod. It cannot slide freely up and down by relying on a large friction force. After being pushed into the anchor rod, it can reach the position required by the project;

[0021] 4. Furthermore, the automatic centering ring described in the utility model is made of ABS, which is a terpolymer plastic with stable chemical properties, good oil resistance, high strength, good toughness, and a thermoplastic polymer structure chemical material suitable for processing and molding;

[0022] 5. Furthermore, the automatic centering ring described in the utility model is made of ABS, and its Shore hardness can reach 90-110, which has a certain strength and well maintains the plasticity of the material. It can be freely scaled with the size of the irregular hole and always maintains the support of the anchor hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a stereogram of the automatic centering ring in the embodiment of the utility model;

[0024] Figure 2 This is a front view of the automatic centering ring in the embodiment of the utility model;

[0025] Figure 3 It is an end view of the automatic centering ring in the embodiment of the utility model;

[0026] Figure 4 yes Figure 3 AA section view;

[0027] Figure 5 It is an exploded schematic diagram of an automatic centering ring provided with an extended boss in an embodiment of the utility model;

[0028] Figure 6 is a three-dimensional diagram of an automatic centering ring provided with an extended boss in an embodiment of the utility model;

[0029] Figure 7 It is a structural schematic diagram of an automatic centering ring provided with an extended boss in an embodiment of the utility model;

[0030] Figure 8 It is a schematic diagram of the sealing gap of the rotating ring of the automatic centering ring provided with an extended boss in the embodiment of the utility model;

[0031] Fig. 9 This is a schematic diagram of the automatic centering ring in the embodiment of the utility model in use;

[0032] The attached figure shows: 100 - inner ring, 200 - axial protrusion, 210 - weight reduction groove, 220 - conical surface, 230 - chamfer, 240 - arc surface, 300 - axial opening, 400 - extension boss, 410 - annular groove, 500 - rotating ring, 600 - anchor rod. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0034] like Figures 1 to 9 As shown, the automatic centering ring of the utility model comprises an inner ring 100; the outer circumferential surface of the inner ring 100 is provided with axial protrusions 200 evenly distributed along the circumference;

[0035] The outer surface of the axial protrusion 200 is a circular arc surface 240; one end of the axial protrusion 200 is provided with a chamfer 230, and the other end is provided with a conical surface 220 that smoothly transitions with the circular arc surface 240;

[0036] The two sides of the axial protrusion 200 are both provided with weight-reducing grooves 210 ; the inner ring 100 is provided with an axial notch 300 .

[0037] The main function of the inner ring 100 of the automatic centering ring described in the utility model is to contact with the anchor rod to realize the positioning of the anchor rod; the main function of the axial protrusion 200 on the inner ring 100 is to realize the centering of the inner ring 100 in the drill hole, which is convenient for realizing the centering of the anchor rod. The main function of setting the axial notch 300 is to facilitate the expansion of the inner ring 100. When the diameter of the anchor rod is larger than the inner ring diameter of the inner ring 100, the inner ring 100 can be expanded and can be stuck on the anchor rod 600. Therefore, according to the needs of the project, the automatic centering ring can be quickly stuck on the anchor rod 600 at any time, and can fit tightly with the anchor rod 600, relying on the large friction force, and cannot slide freely up and down. After being pushed into the anchor rod 600, it can reach the position required by the project.

[0038] The automatic centering ring described in the present invention can be made of wear-resistant and elastic material, such as elastic plastic; the inner ring 100 can also be formed by bending an elastic steel plate, and the axial protrusion 200 is welded on the outer surface of the inner ring 100.

[0039] During use, if Fig. 9 As shown, the inner ring 100 is directly clamped on the anchor rod 600, and then placed in the drill hole. Since one end of the axial protrusion on the outer surface of the inner ring is provided with a conical surface, it has a longer inclined lead-in end, and has good lead-in performance when placed in the drill hole; since the outer surface of the inner ring is provided with axial protrusions evenly distributed along the circumference, the support is uniform in the zoom state, and the centering performance is good.

[0040] In a feasible embodiment, in order to facilitate the fixation of the automatic centering ring on the anchor rod and prevent the automatic centering ring from falling off the anchor rod; further, an extension boss 400 is provided at one end of the inner ring 100; an annular groove 410 is provided on the outer surface of the extension boss 400; a rotating ring 500 is provided in the annular groove 410; and a notch is provided on the rotating ring 500.

[0041] Since the rotating ring 500 also has a notch, when installing the automatic centering ring on the anchor rod 600, the notch of the rotating ring 500 can be rotated to a position aligned with the axial notch 300; then the automatic centering ring is clamped on the anchor rod 600; then the rotating ring 500 is rotated; so that the rotating ring 500 closes the axial notch 300; thereby, the rotating ring 500 and the inner ring 100 wrap the anchor rod 600; thereby preventing the automatic centering ring from falling off the anchor rod.

[0042] In a feasible embodiment, in order to reduce the cost and make the automatic centering ring have better performance and increase its service life, further, the inner ring 100 and the axial projection 200 are made of ABS material; the ABS is a terpolymer plastic. Specifically, the terpolymer plastic is acrylonitrile-styrene-butadiene copolymer.

[0043] In a feasible embodiment, in order to provide uniform support in the zoom state, the centering ring has better centering performance; specifically, the inner ring 100 has five axial protrusions 200 .

[0044] In a feasible embodiment, in order to improve the friction between the anchor rod 600 and the inner ring 100, an anti-skid layer is further provided on the inner wall of the inner ring 100. The anti-skid layer can be provided by providing an anti-skid groove or an anti-skid boss on the inner wall of the inner ring 100.

[0045] In a feasible embodiment, in order to make the inner ring have better expandability and less influence on the centering effect after expansion, further, the width of the axial notch 300 is one sixth to one quarter of the diameter of the inner ring 100 .

Claims

1. An automatic centering ring, comprising an inner ring (100); characterized in that: The outer circumferential surface of the inner ring (100) is provided with axial protrusions (200) evenly distributed along the circumference; The outer surface of the axial protrusion (200) is a circular arc surface (240); one end of the axial protrusion (200) is provided with a chamfer (230), and the other end is provided with a conical surface (220) that smoothly transitions with the circular arc surface (240); Both sides of the axial protrusion (200) are provided with weight-reducing grooves (210); and the inner ring (100) is provided with an axial notch (300).

2. The automatic centering ring according to claim 1, characterized in that: An extension boss (400) is provided at one end of the inner ring (100); an annular groove (410) is provided on the outer surface of the extension boss (400); a rotating ring (500) is provided in the annular groove (410); and a notch is provided on the rotating ring (500).

3. The automatic centering ring according to claim 1 or 2, characterized in that: The inner ring (100) and the axial projection (200) are both made of ABS material; the ABS is a terpolymer plastic.

4. The automatic centering ring according to claim 1 or 2, characterized in that: The inner ring (100) is provided with five axial protrusions (200).

5. The automatic centering ring according to claim 1 or 2, characterized in that: An anti-slip layer is provided on the inner wall of the inner ring (100).

6. The automatic centering ring according to claim 1 or 2, characterized in that: The width of the axial notch (300) is one sixth to one quarter of the diameter of the inner ring (100).

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