A coal wall fiberglass anchor bolt secondary anchoring integrated device

Abstract

This utility model discloses an integrated device for secondary anchoring of fiberglass anchor bolts in coal face, relating to the field of anchor bolt technology. Its key technical features include a cutter holder with a cutter head mounted on one side and a tray mounted on the other side. A nut is connected to one end of the tray, and the nut is connected to a connecting component. A sleeve is installed at one end of the connecting component. By modifying the traditional anchor bolt installation device, the cutter head, tray, and nut are integrated into a single unit. Under the power of a coal drilling rig, the cutter head breaks up the coal surrounding the anchor bolt, exposing the cut portion of the anchor bolt. Simultaneously, the tray and nut are tightened, applying a pre-tightening force to the exposed anchor bolt, thereby completing the secondary anchoring of the anchor bolt to the coal face and improving the anchor bolt's pull-out bearing capacity and shear strength.

Description

Technical Field

[0001] This utility model relates to the field of anchor bolt technology, specifically to an integrated device for secondary anchoring of fiberglass anchor bolts in coal seams. Background Technology

[0002] In coal mining, the safety and stability of roadways are directly related to the safety and efficient production of the coal face. Rock bolts are the main support method for controlling the surrounding rock in underground roadways, and a safe and effective support scheme design is a necessary condition for controlling the stability of the surrounding rock. With the increase in complex roadways such as deep soft rock, strong dynamic pressure, large cross-sections, and deep high stress, domestic and foreign scholars have improved rock bolt support methods to address the challenges of large deformation, large fracture range, and high repair rate of the surrounding rock in deep roadways. They have proposed high-prestressed high-strength rock bolt support technology, rock bolt coupled support technology, and constant-resistance large-deformation rock bolt support technology. These technologies are combined with various support design methods, such as engineering analogy, rock bolt support theoretical calculation, and numerical simulation calculation, to optimize rock bolt support design. This ensures good support effects while reducing the amount of support materials used and saving support costs. Furthermore, to address the performance limitations of traditional anchor bolts in extreme environments, researchers have improved the bolt structure, bolt materials, and anchoring materials from the perspectives of yield strength, elongation, breaking load, and anchoring force, developing prestressed steel rod anchor bolts for mining, fiberglass anchor bolts, energy-absorbing anchor bolts, and new resin anchoring agents. In recent years, my country's roadway anchor bolt support technology has achieved numerous research results in support theory, mechanism of action, support forms, design methods, and support materials, laying a solid foundation for safe, efficient, and green coal mining.

[0003] Fiberglass reinforced plastic (FRP) anchors are a new type of anchor material composed of glass fiber and resin matrix. Due to their low cost, high strength, and corrosion resistance, they are widely used in mine roadway support. However, ordinary FRP anchors have relatively low overall mechanical properties, which cannot meet the needs of roadway support under high dynamic pressure, inevitably leading to problems such as anchor breakage, tray breakage, and common anchor slippage. Numerous scholars both domestically and internationally have studied the failure modes of FRP anchors and made improvements. For example, by improving the properties of the FRP anchor matrix material and fiber reinforcement material, the compressive, tensile, and shear strength of the anchor can be significantly improved. Improving the anchor tail connection structure, nut, tray, and other load-bearing structures of the outer anchor section enhances their connection strength, preventing shear fracture at the borehole opening, and simultaneously forming a cooperative force-bearing system with the anchor body, thereby enhancing the overall load-bearing capacity of the FRP anchor.

[0004] Unlike traditional anchor bolts, fiberglass anchor bolts are easy to cut. Ideally, after a single cut by the coal mining machine, the anchor bolt is flush with the coal face with no exposed portion, leaving the remaining bolt inside the coal seam. To improve anchor bolt utilization, manual slotting is required to expose the bolt from the coal face, install the mounting plate and nut, and apply a second pre-tightening force. In some cases, remote pre-tightening is necessary. Therefore, there is an urgent need to develop an integrated slotting and pre-tightening device that can accurately slot and expose the bolt while safely applying pre-tightening force remotely, thereby improving mining quality and reducing safety risks. Utility Model Content

[0005] Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an integrated secondary anchoring device for fiberglass anchor bolts in coal seams, which can solve the problems mentioned in the background technology.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an integrated secondary anchoring device for fiberglass anchor bolts in coal seams, comprising a cutter holder, a cutter head installed on one side of the cutter holder, a tray installed on the other side of the cutter holder, a nut connected to one end of the tray, a connecting component connected to one end of the nut, and a sleeve installed at one end of the connecting component.

[0008] Preferably, the cutter head adopts a twist drill structure, and a positioning protrusion is provided at one end of the cutter head.

[0009] Preferably, the tool holder has an assembly notch, the tool head is installed in the assembly notch, the bottom of the tool holder has a screw hole, and the tool holder is connected to the tray by bolts.

[0010] Preferably, the tray has a circular hole in the middle that matches the anchor rod, the edge of the circular hole is chamfered, the edge of the tray has screw holes, and the tray is connected to the tool holder by bolts.

[0011] Preferably, the nut is provided with internal and external threads, the internal and external threads include a main thread and an auxiliary locking thread, the main thread is a trapezoidal thread, and the auxiliary thread is provided with elastic reverse sawtooth locking teeth at the root of the main thread. The nut is made of high-strength alloy material, and the internal thread of the nut matches the anchor rod.

[0012] Preferably, the connecting component is a high-strength metal sleeve, the connecting component is in the shape of a hollow cylinder, the connecting component is provided with a bidirectional thread, one end is connected to a nut and the other end is connected to a sleeve, and the thread is matched with the connecting component.

[0013] Preferably, the sleeve is made of high-strength alloy material, and one end of the sleeve is connected to the connecting component.

[0014] Compared with the prior art, this utility model provides an integrated device for secondary anchoring of fiberglass anchor bolts in coal seams, which has the following beneficial effects:

[0015] By modifying the traditional anchor bolt installation device, the cutter head, tray, and nut are connected as a whole. Under the power of the pneumatic coal drilling rig, the cutter head breaks up the coal around the anchor bolt in the coal face, exposing the cut portion of the anchor bolt. At the same time, the tray and nut are tightened, applying a secondary preload to the exposed anchor bolt, thus completing the secondary anchoring of the anchor bolt to the coal face and improving the anchor bolt's pull-out bearing capacity and shear strength. The equipment integrates functions such as cutter head grooving and sleeve-driven nut preload, realizing an integrated process for secondary anchoring operations. Furthermore, the high-strength connection between the cutter head and tray ensures the effective transmission of cutting force and anchoring force. Compared to traditional manual grooving, this method saves manpower and resources, ensures safety, and saves a significant amount of time. All components are made of high-strength, wear-resistant, and corrosion-resistant materials, and feature a convenient assembly and disassembly structure, enabling coverage of complex coal conditions in various working faces, and possessing broad economic value and application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0017] Figure 2 This is a front view of the blade of this utility model.

[0018] Figure 3 This is a side view of the blade head of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the nut of this utility model.

[0020] In the diagram: 101, cutter head; 102, cutting edge; 103, anchor bolt hole; 104, positioning protrusion; 201, cutter holder; 301, tray; 401, nut; 402, elastic reverse serrated locking tooth; 501, connecting part; 601, sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] Please see Figure 1-4 This utility model provides a technical solution for an integrated secondary anchoring device for fiberglass anchor bolts in coal seams:

[0024] Example 1: A secondary anchoring integrated device for fiberglass anchor bolts in coal seams includes a cutter holder 201, a cutter head 101 installed on one side of the cutter holder 201, a tray 301 installed on the other side of the cutter holder 201, a nut 401 connected to one end of the tray 301, a connecting component 501 connected to one end of the connecting component 501, a sleeve 601 installed at one end of the connecting component 501, a cutting edge module 102 also provided on the outer wall of the cutter head 101, and an anchor bolt hole 103 provided at the center of the cutter head 101;

[0025] The cutter head 101 adopts a twist drill structure, and a positioning protrusion 104 is provided at one end of the cutter head 101;

[0026] The tool holder 201 is provided with an assembly notch, and the tool head 101 is installed in the assembly notch. The bottom of the tool holder 201 has a screw hole. The tool holder 201 is connected to the tray 301 by bolts. The tray 301 has a round hole in the middle that matches the anchor rod. The edge of the round hole of the tray 301 is chamfered. The edge of the tray 301 has a screw hole. The tray 301 is connected to the tool holder 201 by bolts.

[0027] The tool holder 201 and the tray 301 are connected using high-strength bolts, along with spring washers and flat washers, to ensure a tight connection. The central anchor hole of the tray 301 is slightly larger than the diameter of the anchor rod to avoid excessive friction between the anchor rod and the hole wall during installation. The edge of the hole is chamfered to reduce hard friction with the anchor rod surface, while also reducing the difficulty of aligning the anchor rod with the hole and shortening the installation time.

[0028] Example 2: Based on Example 1, the nut 401 is provided with internal and external threads, including a main thread and an auxiliary locking thread. The main thread is a trapezoidal thread, and the auxiliary thread is provided with elastic reverse sawtooth locking teeth 402 at the root of the main thread. The nut 401 is made of high-strength alloy material. The internal thread of the nut 401 matches the anchor rod. The nut 401 is welded to the outer surface of the tray 301. The connecting part 501 is a high-strength metal sleeve. The connecting part 501 is hollow cylindrical in shape. The connecting part 501 is provided with bidirectional threads. One end is connected to the nut 401, and the other end is connected to the sleeve 601. The threads match the connecting parts. The connecting part 501 is provided with a double sealing structure at the connection point. The double sealing structure consists of an O-ring rubber seal and a water-swellable seal. The sleeve 601 is made of high-strength alloy material. One end of the sleeve 601 is connected to the connecting part 501, and the other end is connected to the coal drilling rig.

[0029] Nut 401 is pre-fixed to the outer surface of tray 301 by welding, ensuring the coaxiality of nut 401 and the circular hole of tray 301, and ensuring that the error is within the allowable range. Nut 401 is screwed into connecting component 501 through external thread, with the screw-in length being 2 / 3 of the thread, to avoid pull-out failure caused by reduced thread engagement area, and root stress concentration and fatigue cracks caused by excessive thread engagement. An O-ring rubber seal is installed at the connection of connecting component 501, ensuring that the O-ring is not twisted or overlapping. A water-swellable seal is installed outside the O-ring, and the joint of the seal is glued with special adhesive. Its main function is to reduce the intrusion of solids and liquids into the device in the working environment, and it also provides a certain buffering effect.

[0030] The specific operating steps of this utility model for using a secondary anchoring integrated device for fiberglass anchor bolts in coal seams are as follows:

[0031] Step 1: Complete the assembly of cutter head 101 and cutter holder 201, cutter holder 201 and tray 301, connecting component 501, sleeve 601 and pneumatic coal drill according to the process, and ensure that all components are firmly connected and the sealing structure is installed in place.

[0032] Step 2: Move the device to the coal face to be worked on, and adjust the angle of the pneumatic coal drill so that the axis of the cutter head 101 coincides with the axis of the designed anchor hole 103 to ensure accurate slotting position.

[0033] Step 3: Start the pneumatic coal drill rig. The cutter head 101 rotates, and the cutting edge 102 breaks up the coal around the cut anchor bolt. The resulting coal slag is discharged through the spiral groove of the twist drill. By observing the advance of the pneumatic coal drill rig and the preset scale line on the cutter head 101, control the cutting depth to the design value. At this time, the anchor bolt hole 103 and the positioning protrusion 104 ensure positioning accuracy. Then, shut down the pneumatic coal drill rig.

[0034] Step 4: Adjust the device position to ensure the end of the anchor rod is aligned with the internal thread of nut 401. Start the pneumatic drilling rig, which will rotate nut 401 and tray 301 via sleeve 601 and connecting component 501.

[0035] The 401 nut has an internal thread that mates with the anchor rod, tightening the anchor rod and applying a preload.

[0036] The main thread in the external thread of nut 401 transmits torque, and the elastic reverse sawtooth locking tooth 402 engages with the thread surface of connecting part 501 to prevent loosening.

[0037] The coal drilling rig is shut down after the anchor bolt preload reaches the design value.

[0038] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A secondary anchoring integrated device for fiberglass anchor bolts in coal seams, comprising a cutter holder (201), wherein a cutter head (101) is mounted on one side of the cutter holder (201), characterized in that: A tray (301) is installed on the other side of the tool holder (201). A nut (401) is connected to one end of the tray (301). One end of the nut (401) is connected to the connecting component (501). A sleeve (601) is installed on one end of the connecting component (501). A cutting edge module (102) is also provided on the outer wall of the tool head (101). An anchor hole (103) is provided at the center of the tool head (101).

2. The coal wall glass steel anchor rod secondary anchoring integrated device according to claim 1, characterized in that: The cutter head (101) adopts a twist drill structure, and a positioning protrusion (104) is provided at one end of the cutter head (101).

3. The coal wall glass steel anchor rod secondary anchoring integrated device according to claim 1, characterized in that: The tool holder (201) is provided with an assembly notch, the tool head (101) is installed in the assembly notch, and the bottom of the tool holder (201) has a screw hole.

4. The coal wall glass steel anchor rod secondary anchoring integrated device according to claim 1, characterized in that: The tray (301) has a round hole in the middle that matches the anchor rod. The edge of the round hole of the tray (301) is chamfered. The edge of the tray (301) has a screw hole. The tray (301) is connected to the tool holder (201) by bolts.

5. The integrated secondary anchoring device for coal wall glass steel anchor rod according to claim 1, characterized in that: The nut (401) is provided with internal and external threads, which include a main thread and an auxiliary locking thread. The main thread is a trapezoidal thread.

6. The coal wall glass steel anchor rod secondary anchorage integrated device according to claim 1, characterized in that: The connecting component (501) is a high-strength metal sleeve. The connecting component (501) is hollow cylindrical in shape. The connecting component (501) is provided with bidirectional threads, and one end is connected to the nut (401).

7. The coal wall glass steel anchor rod secondary anchorage integrated device according to claim 1, characterized in that: The sleeve (601) is made of high-strength alloy material, and one end of the sleeve (601) is connected to the connecting component (501).

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