Rotary grouting adapter and anchor rod drilling device

Abstract

The invention discloses a rotary grouting adapter and an anchor rod drilling device, and the rotary grouting adapter comprises a grouting sleeve which is internally provided with a hollow sleeve hole; the grouting mandrel is rotatably installed in the hollow sleeve hole of the grouting sleeve, the grouting mandrel is provided with a first connecting end and a second connecting end which extend out of the two ends of the hollow sleeve hole, the first connecting end is used for being connected with a drilling machine, and the second connecting end is an external thread connecting end and is used for being connected with a hollow anchor rod; the grouting mandrel is connected with the grouting sleeve in a movable sealing mode to form an annular sealing grouting cavity, a grouting pipe communicated with the annular sealing grouting cavity is arranged on the grouting sleeve, and a grouting channel which is communicated with the annular sealing grouting cavity and extends to the end portion of the external thread connecting end is arranged in the grouting mandrel. According to the scheme, the technical problem that a traditional adapter is prone to loosening and difficult to disassemble under the working condition of violent impact vibration is thoroughly solved, and the continuity of grouting operation, the overall reliability of equipment and the economical efficiency of maintenance are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of civil engineering equipment technology, specifically to a rotary grouting adapter and an anchor drilling device. Background Technology

[0002] The rotary grouting adapter is a key piece of equipment in the construction of self-drilling hollow anchor bolts, mainly used to perform grouting operations simultaneously during drilling. It is usually installed between the drilling rig and the hollow anchor bolt to achieve simultaneous transmission of rotary power and delivery of high-pressure grout.

[0003] See Figure 1 and Figure 2 As shown, a common rotary grouting adapter 300' mainly includes a grouting sleeve 301' and a grouting mandrel 302' housed within it. One end of the grouting mandrel 302' is connected to the output end of the drilling rig, and the other end is directly connected to the external thread end of the hollow anchor rod 200 via an internal thread. An annular sealed chamber is formed between the grouting sleeve 301' and the grouting mandrel 302', and grout is injected through the grouting pipe. The grout flows into the hollow anchor rod 200 through the channel inside the grouting mandrel, and finally reaches the bottom or sidewall of the borehole.

[0004] However, existing rotary grouting adapter structures have revealed the following significant defects in actual construction: First, the existing rotary grouting adapter structure has problems such as easy locking of threaded connections, difficulty in disassembly, and easily damaged parts.

[0005] See Figure 2 As shown, the output end of the grouting mandrel 302' of the traditional rotary grouting adapter 300' is internally threaded, directly engaging with the external thread of the hollow anchor rod 200. During the combined drilling process of "impact + rotation," the internal and external threads of the hollow anchor rod and the grouting mandrel will continuously tighten under the combined action of vibration and rotational force, even causing a "seizing" phenomenon. This often results in the end of the hollow anchor rod 200 being stuck inside the internal and external threaded holes of the grouting mandrel (e.g., ...). Figure 2 As shown at point A in the middle, disassembly is extremely difficult. In more serious cases, the hollow anchor rod 200 may break at the threaded connection, with the broken end remaining in the internal threaded hole of the grouting mandrel 302', causing the expensive grouting mandrel 302' to be scrapped directly, seriously affecting construction efficiency and increasing maintenance costs.

[0006] Secondly, the existing rotary grouting adapter structure has the problem of unreliable axial positioning and easy detachment.

[0007] like Figure 1 and Figure 2As shown, to fix the grouting sleeve 301' and prevent it from moving axially relative to the grouting mandrel 302', two semi-circular retaining rings 303' are usually fitted into the retaining grooves of the grouting mandrel 302', and then bolted together. However, under continuous and severe drilling impact and rotational vibration conditions, the locking bolts are prone to loosening, causing the semi-circular retaining rings 303' to fail. Once the retaining rings fail, the grouting sleeve 301' loses its axial restraint and is easily detached from the grouting mandrel 302', which not only interrupts the grouting operation but may also cause equipment damage or safety accidents.

[0008] In summary, existing rotary grouting adapters suffer from two major structural drawbacks: poor axial positioning stability and easy locking and disassembly of threaded connections. These problems restrict the continuity and economy of construction, necessitating a new structure to solve these technical challenges and achieve reliable positioning and convenient disassembly of the adapter under complex working conditions.

[0009] In view of this, the present invention is hereby proposed. Summary of the Invention

[0010] To address the aforementioned problems, this invention proposes a rotary grouting adapter and an anchor drilling device, specifically employing the following technical solution: A rotary grouting adapter, comprising: Grouting sleeve with a hollow sleeve hole inside; The grouting mandrel is rotatably installed in the hollow sleeve of the grouting sleeve. The grouting mandrel has a first connecting end and a second connecting end that extend out of both ends of the hollow sleeve. The first connecting end is used to connect to the drilling rig, and the second connecting end is an external threaded connecting end used to connect to the hollow anchor rod. The grouting mandrel and the grouting sleeve are dynamically sealed together to form an annular sealed grouting chamber. The grouting sleeve is provided with a grouting pipe that communicates with the annular sealed grouting chamber. The grouting mandrel is provided with a grouting channel that communicates with the annular sealed grouting chamber and extends to the end of the external threaded connection.

[0011] As an optional embodiment of the present invention, a rotary grouting adapter of the present invention includes a drill tail sleeve, wherein the external threaded connection end of the grouting mandrel is connected to the hollow anchor rod through the drill tail sleeve; One end of the drill bit sleeve has a first internal threaded hole, and the other end has a second internal threaded hole. The internal threads of the first and second internal threaded holes have the same direction. The first internal threaded hole is threadedly connected to the hollow anchor rod, and the second internal threaded hole is threadedly connected to the external threaded end of the grouting mandrel.

[0012] As an optional embodiment of the present invention, the first internal connecting threaded hole has a first port and a second port, the second internal connecting threaded hole has a third port and a fourth port, the second port and the fourth port are located inside the drill tail sleeve and are connected through a connecting hole, and a movable pad is installed in the connecting hole.

[0013] As an optional embodiment of the present invention, the major diameter of the thread at the external threaded connection end of the grouting mandrel is greater than the major diameter of the thread of the hollow anchor rod, the inner diameter of the second internal threaded hole is greater than the inner diameter of the first internal threaded hole, the diameter of the connecting hole is slightly greater than or equal to the inner diameter of the second internal threaded hole, a limiting step is formed between the connecting hole and the first internal threaded hole, and the movable pad is installed in the connecting hole by the second internal threaded hole and is stopped and limited by the limiting step.

[0014] As an optional embodiment of the present invention, the grouting channel includes a radial grouting channel arranged radially along the grouting mandrel and an axial grouting channel arranged axially along the grouting mandrel. One end of the radial grouting channel is connected to the annular sealed grouting chamber, and the other end is connected to the axial grouting channel. The axial grouting channel extends to the end of the external threaded connection and communicates with the outside. The movable pad has a hollow pad channel inside, and the hollow anchor has a hollow anchor channel inside. The axial grouting channel, the hollow pad channel, and the hollow anchor channel are connected in sequence.

[0015] As an optional embodiment of the present invention, a rotary grouting adapter of the present invention includes a retaining ring assembly, which is mounted on the grouting mandrel and located on one side of the grouting sleeve, for preventing the grouting sleeve from dislodging from the grouting mandrel. The retaining ring assembly is located near the root of the external threaded connection end, and an elastic washer is provided between the retaining ring assembly and the drill tail sleeve.

[0016] As an optional embodiment of the present invention, the grouting mandrel includes a main shaft body, the outer diameter of which is larger than the outer diameter of the first connecting end and the external threaded connecting end. The root of the external threaded connecting end includes a connecting shaft section and a variable diameter shaft section. The external threaded connecting end, the connecting shaft section, the variable diameter shaft section, and the main shaft body are integrally formed. The outer diameter of the end of the variable diameter shaft section that connects to the main shaft body is larger than the outer diameter of the end that connects to the connecting shaft section. The retaining ring assembly includes a first retaining ring mounted on the main shaft and a second retaining ring mounted on the variable diameter shaft section. The second retaining ring abuts against the first retaining ring, and the elastic washer is disposed between the second retaining ring and the drill bit sleeve.

[0017] As an optional embodiment of the present invention, the drill tail sleeve includes: A sleeve body, wherein one end of the sleeve body has the first internal connecting threaded hole and the other end has the second internal connecting threaded hole; An anti-detachment inner ring is detachably installed inside the sleeve and located at the first port of the second inner connecting threaded hole. The anti-detachment inner ring is used to prevent the external threaded connection end of the grouting mandrel from coming out of the second inner connecting threaded hole. An anti-detachment outer ring is detachably installed on the sleeve body outside the first port side of the second inner connecting threaded hole. The anti-detachment outer ring is used to prevent the anti-detachment inner ring from coming out of the sleeve body.

[0018] As an optional embodiment of the present invention, the external threaded connection end has an external threaded rod and a threaded rod root, and the anti-detachment inner ring includes multiple sub-inner rings and an inner ring connecting body. The multiple sub-inner rings are spliced ​​together on the outer peripheral wall of the threaded rod root to form a ring structure, and the inner ring connecting body surrounds the outer peripheral wall of the multiple sub-inner rings to form a complete anti-detachment inner ring. An inner ring mounting hole is formed inside the sleeve at the first port of the second inner connecting threaded hole. The external threaded connection end of the anti-detachment inner ring is installed through the inner ring mounting hole and is threadedly connected to the second inner connecting threaded hole. The anti-detachment inner ring is set inside the inner ring mounting hole. The outer peripheral wall end of the sleeve is provided with a limiting protrusion ring. The anti-detachment outer ring includes multiple sub-outer rings and an outer ring connector. The multiple sub-outer rings are spliced ​​together on the limiting protrusion ring of the sleeve to form a ring structure. The outer ring connector surrounds the outer peripheral wall of the multiple sub-outer rings to form a complete anti-detachment outer ring. The anti-detachment outer ring extends inward from the end near the inner ring mounting hole to form an outer ring anti-detachment protrusion. The anti-detachment outer ring extends inward from the end away from the inner ring mounting hole to form an outer ring limiting protrusion. The outer ring limiting protrusion abuts against the limiting protrusion ring.

[0019] The present invention also provides an anchor drilling device having the aforementioned rotary grouting adapter, comprising: A drilling rig, wherein the output end of the drilling rig is fixedly connected to the first connecting end of the grouting mandrel; The hollow anchor rod is fixedly connected to the external threaded end of the grouting mandrel via a drill tail sleeve.

[0020] The rotary grouting adapter and anchor drilling device provided by this invention address two major drawbacks of existing technologies: unreliable axial positioning and easy detachment of the grouting sleeve, as well as easy locking and disassembly difficulties in threaded connections. Through a series of innovative designs, it achieves comprehensive and significant technical benefits. 1. It fundamentally solves the problems of thread lock-up and disassembly, enabling convenient and non-destructive maintenance.

[0021] Innovative Structural Principle: The output end of the grouting mandrel is changed from the traditional internal thread to an external thread connection end, and the anchor rod is connected through the intermediate component of the drill tail sleeve, which cuts off the path of direct engagement and locking between the anchor rod and the expensive mandrel from the root.

[0022] Priority disassembly sequence: By designing the threaded locking force between the mandrel and the drill tail sleeve to be greater than that between the anchor rod and the drill tail sleeve, the anchor rod connection is ensured to loosen first during disassembly.

[0023] Axial force self-unloading mechanism: The movable pad inside the drill tail sleeve constitutes the key "live block". Even under the most unfavorable conditions, this structure can immediately release the axial locking force of the anchor bolt thread pair when the mandrel and the drill tail sleeve separate slightly, allowing it to easily loosen, thus achieving "fail-safe" disassembly.

[0024] Modularization and cost reduction: The easily worn threaded connection parts are transferred to an independent, lower-cost drill tail sleeve. After wear, only the drill tail sleeve needs to be replaced, which protects the core grouting mandrel and greatly reduces maintenance costs.

[0025] 2. A highly reliable axial positioning and buffering system has been established to prevent sleeve detachment.

[0026] Combining rigid anti-loosening and flexible buffering: A retaining ring assembly fixed to the mandrel replaces the easily loosening bolt clasps, providing an absolutely reliable axial rigid stop for the grouting sleeve. An elastic washer ring is added between the retaining ring and the drill bit sleeve, forming a flexible pre-tightening interface.

[0027] Anti-lock and overload protection: The elastic washer ring avoids lock-up caused by rigid contact between metal end faces. At the same time, the internal structure (such as the end face of the movable pad) limits the screwing of the drill bit sleeve, so that the elastic washer ring is only slightly pre-compressed, avoiding overload damage caused by continuous drilling impact and extending its service life.

[0028] Enhanced system stability: This combined design can also absorb some axial impact vibrations, improving the dynamic stability of the entire connection system under harsh working conditions.

[0029] 3. It ensures the continuity and efficiency of the grouting process.

[0030] Unobstructed grout channels: Through the grouting channels in the mandrel, the connecting holes in the drill tail sleeve, and the hollow channels of the movable pad, a continuous and smooth grout flow channel is constructed from the grouting pipe to the hollow anchor rod, effectively preventing blockage and pressure loss, and ensuring the reliability of synchronous grouting.

[0031] 4. Provides additional connection security protection.

[0032] Optional anti-loosening structure: Through the ingenious split design of the anti-loosening inner ring and the anti-loosening outer ring, the threaded connection between the mandrel and the drill bit sleeve is prevented from loosening, while ensuring the ease of installation and removal of these anti-loosening components, providing additional protection for high-intensity repeated use.

[0033] In summary, the rotary grouting adapter provided by this invention systematically integrates and coordinates the core features such as the "externally threaded mandrel," the "tip sleeve with movable pad," and the "retaining ring and elastic washer assembly," forming a complete solution. This solution not only completely solves the persistent problems of traditional adapters being "easy to loosen and difficult to disassemble" under severe impact and vibration conditions, but also significantly improves the continuity of grouting operations, the overall reliability of the equipment, and the economy of maintenance, demonstrating outstanding practical value and significant progress. Attached Figure Description Figure 1 A schematic diagram of the structure of an existing rotary grouting adapter involved in the background art; Figure 2 A cross-sectional view of an existing rotary grouting adapter involved in the background art; Figure 3 A schematic diagram of the structure of the rotary grouting adapter according to Embodiment 1 of the present invention; Figure 4 A cross-sectional view of the rotary grouting adapter according to Embodiment 1 of the present invention; Figure 5 A schematic diagram of the anchor drilling device according to Embodiment 1 of the present invention (excluding the drilling rig); Figure 6 A cross-sectional view of the anchor drilling device according to Embodiment 1 of the present invention; Figure 7 Cross-sectional view of the anchor drilling device according to Embodiment 1 of the present invention (hollow anchor rod disassembled state). Figure 8 A three-dimensional structural schematic diagram of the drill tail sleeve in Embodiment 2 of the present invention; Figure 9 A cross-sectional view of the drill tail sleeve in Embodiment 2 of the present invention; Figure 10 Front view of the anti-detachment outer ring in Embodiment 2 of the present invention; Figure 11 Side view of the anti-detachment outer ring in Embodiment 2 of the present invention; Figure 12 Front view of the anti-detachment inner ring in Embodiment 2 of the present invention; Figure 13 Side view of the anti-detachment inner ring of Embodiment 2 of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention.

[0035] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention 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 invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Example 1 See Figures 3-7 As shown, this embodiment of a rotary grouting adapter includes: Grouting sleeve 301 has a hollow sleeve hole inside; The grouting mandrel 302 is rotatably installed in the hollow sleeve hole of the grouting sleeve 301. The grouting mandrel 302 has a first connecting end 304 and a second connecting end extending out of both ends of the hollow sleeve hole. The first connecting end 304 is used to connect to the drilling rig, and the second connecting end is an external threaded connecting end 305, which is used to connect to the hollow anchor rod 200. The grouting mandrel 302 and the grouting sleeve 301 are dynamically sealed together to form an annular sealed grouting chamber. The grouting sleeve 301 is provided with a grouting pipe 311 that communicates with the annular sealed grouting chamber. The grouting mandrel 302 is provided with a grouting channel 313 that communicates with the annular sealed grouting chamber and extends to the external threaded connection end 305.

[0040] The rotary grouting adapter of this embodiment, by setting the second connecting end of the grouting mandrel 302 as an external threaded connecting end 305, brings significant technical benefits and effectively solves the core drawbacks of the prior art, namely, the ease of locking and the difficulty of disassembly in threaded connections. The specific technical effects are as follows: This fundamentally avoids the direct locking between the hollow anchor rod 200 and the grouting mandrel 302: the traditional method of direct connection between the internal thread of the grouting mandrel and the external thread of the hollow anchor rod 200 is completely changed. In this embodiment, the hollow anchor rod 200 is connected to the external thread connection end 305 via an intermediate connector (such as a drill tail sleeve). This structural change ensures that under drilling impact vibration, the hollow anchor rod 200 no longer directly and continuously tightens and engages with the internal thread of the grouting mandrel 302, thereby eliminating the risk of the end of the hollow anchor rod 200 jamming or even breaking inside the grouting mandrel 302, causing the entire adapter to be scrapped. This significantly improves the service life of the key component (grouting mandrel 302) and the economic efficiency of construction.

[0041] Convenient and reliable disassembly is achieved: the design of the external threaded connection end 305 creates conditions for optimizing the connection and disassembly logic.

[0042] Disassembly priority optimization: In the actual connection structure, the thread specification (e.g., major diameter) of the external threaded connection end 305 can be made larger than that of the hollow anchor rod 200. This ensures that the thread locking force between the grouting mandrel 302 and the intermediate connecting part (e.g., the drill tail sleeve) is greater than the locking force between the hollow anchor rod 200 and the intermediate connecting part. During disassembly, the hollow anchor rod 200 and the intermediate connecting part are more likely to loosen relative to each other first, simplifying the disassembly steps.

[0043] The structural strength of the connection end is enhanced: Compared with the traditional structure that requires machining an internal thread hole at the end of the grouting mandrel 302, the external thread connection end 305 of this embodiment is usually machined from a solid or thick-walled rod body. Its root structure is stronger, and its mechanical properties of torsion and impact resistance are better. It can better adapt to the load under complex working conditions and further improve the reliability of the equipment.

[0044] In summary, the rotary grouting adapter of this embodiment, by innovatively designing the output end of the grouting mandrel 302 as an external thread, not only directly cuts off the traditional path that leads to thread lock-up, but also introduces a better force transmission and disassembly sequence, enabling the entire adapter to be quickly and without damage even after being subjected to severe operational vibrations. This greatly improves maintenance efficiency and equipment availability, and solves a long-standing technical pain point that has plagued construction.

[0045] To achieve a fixed connection between the rotary grouting adapter and the hollow anchor rod 200 in this embodiment, a rotary grouting adapter includes a drill tail sleeve 100. The external threaded connection end 305 of the grouting mandrel 302 is connected to the hollow anchor rod 200 through the drill tail sleeve 100. One end of the drill tail sleeve 100 has a first internal threaded hole 103, and the other end has a second internal threaded hole 104. The internal threads of the first internal threaded hole 103 and the second internal threaded hole 104 have the same direction. The first internal threaded hole 103 is threadedly connected to the hollow anchor rod 200, and the second internal threaded hole 104 is threadedly connected to the external threaded connection end 305 of the grouting mandrel 302.

[0046] Furthermore, in this embodiment, the first internal connecting threaded hole 103 has a first port and a second port, and the second internal connecting threaded hole 104 has a third port and a fourth port. The second port and the fourth port are located inside the shank sleeve 100 and are connected through a connecting hole 105. A movable pad 106 is installed inside the connecting hole 105.

[0047] This embodiment achieves a key "movable block" structure by setting a movable pad 106 in the connecting hole 105 between the first internal threaded hole 103 and the second internal threaded hole 104. This design produces the following outstanding technical effects: A unique axial force relief mechanism has been created to ensure smooth disassembly: the movable pad 106 constitutes a "floating" link in the connection. During disassembly, even in the worst-case scenario—where the threaded pair between the grouting mandrel 305 and the drill tail sleeve 100 does not loosen first, but rather the threaded pair between the hollow anchor rod 200 and the drill tail sleeve 100 undergoes a slight relative separation (i.e., the grouting mandrel 305 slightly pulls the movable pad 106 out)—this small displacement immediately causes the rigid axial contact between the end face of the hollow anchor rod 200 and the movable pad 106 (or transmitted through it) to be released. Once this rigid contact disappears, the enormous axial locking force generated by tightening between the internal threads of the hollow anchor rod 200 and the drill tail sleeve 100 (i.e., the axial component of the force between the threaded pairs) will instantly lose its support and rapidly decay or disappear completely. At this point, the threaded connection between the hollow anchor rod 200 and the drill tail sleeve 100 is essentially in a "pre-loosening" state, and the remaining circumferential friction becomes very small. Thus, the hollow anchor rod 200 can be easily unscrewed from the drill tail sleeve 100 by hand or with simple tools, completely solving the technical problem of extremely difficult disassembly after the threads are "locked up" in the traditional structure.

[0048] It provides a reliable force transmission and sealing interface: Under normal operating conditions (drilling and grouting), the movable pad 106 is structurally limited by the end face of the hollow anchor rod 200 and the connecting hole 106, forming a stable force transmission intermediate and a sealed link for the grout channel. It can effectively transmit the impact and rotational loads of the drilling rig from the grouting mandrel 302 to the hollow anchor rod 200 through the drill tail sleeve 100, while ensuring that the grout flows smoothly from the grouting mandrel 302 into the hollow anchor rod 200 through its internal or peripheral channels, thus combining structural and fluid functions.

[0049] A "fail-safe" disassembly logic is implemented: this design gives the entire connection system an "intelligent" priority sequence during disassembly. Ideally, the grouting mandrel 302 will loosen first due to the design allowing for a greater threaded locking force between the mandrel 302 and the drill bit sleeve 100. Even if this sequence is occasionally reversed, as described above, the movable pad 106 structure can immediately intervene, forcing easy release of the second connection point by relieving axial force. This mechanism ensures that in any possible initial disassembly state, it ultimately leads to easy, non-destructive separation, greatly improving the reliability and user-friendliness of maintenance operations.

[0050] In summary, the movable pad 106 structure is one of the core ingenious features that enables convenient disassembly in this embodiment. By introducing a slightly movable intermediate element, it creates a physical mechanism that can actively release the axial locking force of the thread, thereby mitigating the resistance that may be encountered during placement and disassembly, and ensuring that the anchor connection can be quickly and safely released even after severe working conditions.

[0051] As an optional implementation of this embodiment, the major diameter of the thread of the external threaded connection end 305 of the grouting mandrel 302 is larger than the major diameter of the thread of the hollow anchor rod 200, the inner diameter of the second inner threaded hole 104 is larger than the inner diameter of the first inner threaded hole 103, the diameter of the connecting hole 105 is slightly larger than or equal to the inner diameter of the second inner threaded hole 104, a limiting step is formed between the connecting hole 105 and the first inner threaded hole 103, and the movable pad 106 is installed in the connecting hole 105 by the second inner threaded hole 104 and is stopped and limited by the limiting step.

[0052] The above implementation method constructs a mechanical system that optimizes force transmission and disassembly logic by precisely setting the dimensional fit between each component. The specific technical effects are as follows: A clear disassembly priority sequence was established: by making the major diameter of the threaded connection end 305 of the grouting mandrel 302 larger than the major diameter of the thread of the hollow anchor rod 200, and correspondingly designing the inner diameter of the second inner connecting threaded hole 104 on the drill tail sleeve 100 that mates with it to be larger than the inner diameter of the first inner connecting threaded hole 103 connecting the hollow anchor rod 200, this series of dimensional designs ensures that the threaded connection between the grouting mandrel 302 and the drill tail sleeve 100 has a larger contact area and better mechanical conditions. Therefore, under the same working conditions, the locking force formed by this connection will be significantly stronger than that between the hollow anchor rod 200 and the drill tail sleeve 100. This makes the threaded pair between the hollow anchor rod 200 and the drill tail sleeve 100 a relatively "weak" link during disassembly, and thus designed to be loosened first, achieving a controllable and orderly disassembly process, making the operation simpler and more reliable.

[0053] The precise positioning and operational reliability of the movable pad 106 are ensured: the diameter of the connecting hole 105 is designed to be slightly larger than or equal to the inner diameter of the second internal connecting threaded hole 104, allowing the movable pad 106 to be smoothly installed from this end. Simultaneously, the naturally formed limiting step between the connecting hole 105 and the first internal connecting threaded hole 103 provides a clear axial positioning surface for the movable pad 106. This structure ensures that during drilling and grouting, the movable pad 106 is firmly confined within its working cavity, preventing axial movement or deflection. This allows it to stably perform its core functions of force transmission, grout conduction, and triggering the axial force removal mechanism during disassembly, guaranteeing the long-term stability of the system.

[0054] The structural space and assembly process have been optimized: the connecting hole 105, threaded holes of different inner diameters, and limiting steps are integrated into a single design, making the internal structure of the drill bit sleeve 100 compact and the functional areas clearly defined. This design not only makes reasonable use of space, but also makes the installation path of the movable pad 106 (inserted from the direction of the second internal connecting threaded hole 104) clear and convenient, which is conducive to assembly and replacement during later maintenance.

[0055] In summary, the dimensional matching scheme in the above embodiments is not a simple parameter selection, but a key design deeply coupled with core invention points such as the "external threaded mandrel 302" and the "movable pad 106". It structurally solidifies the disassembly logic of "loosening the hollow anchor rod 200 first" and ensures the stable operation of the key functional component, the movable pad 106, thereby systematically improving the reliability and maintenance convenience of the entire rotary grouting adapter under complex working conditions.

[0056] To enable the rotary grouting adapter of this embodiment to perform grouting while drilling the hollow anchor 200, the grouting channel 313 of this embodiment includes a radial grouting channel 3131 arranged radially along the grouting mandrel 302 and an axial grouting channel 3132 arranged axially along the grouting mandrel 302. One end of the radial grouting channel 3131 is connected to the annular sealed grouting chamber, and the other end is connected to the axial grouting channel 3132. The axial grouting channel 3132 extends to the end of the external threaded connection 305 and communicates with the outside. The movable pad 106 has a hollow pad channel 1061 inside, and the hollow anchor 200 has a hollow anchor channel 201 inside. The axial grouting channel 3132, the hollow pad channel 1061, and the hollow anchor channel 201 are connected in sequence.

[0057] In this embodiment, a dynamic sealing assembly 312 is provided between the grouting sleeve 301 and the grouting mandrel 302 to achieve a dynamic sealing connection between the two, forming an annular sealed grouting chamber.

[0058] As an optional implementation of this embodiment, a rotary grouting adapter of this embodiment includes a retaining ring assembly. The retaining ring assembly is installed on the grouting mandrel 302 and located on one side of the grouting sleeve 301, and is used to prevent the grouting sleeve 301 from coming out of the grouting mandrel 302. The retaining ring assembly is close to the root of the external threaded connection end 305, and an elastic washer 306 is provided between the retaining ring assembly and the drill tail sleeve 100.

[0059] This optional embodiment constructs an innovative axial positioning and buffering system by setting a retaining ring assembly on the grouting mandrel 302 and adding an elastic washer ring 306 between it and the drill bit sleeve 100, achieving the following significant technical effects: It provides reliable and maintenance-free axial positioning, eliminating the risk of movement and detachment of the grouting sleeve 301: the retaining ring assembly is fixedly mounted on the grouting mandrel 302, replacing the traditional bolt-locking semi-circular retaining ring. This assembly forms a rigid axial stop surface, which can reliably prevent the grouting sleeve 301 from dislodging from its installation position. This design completely eliminates the hidden dangers of bolt loosening and retaining ring failure caused by impact and vibration, ensuring the positional stability of the grouting sleeve 301 under long-term severe working conditions, thereby ensuring the sealing integrity of the annular sealing grouting chamber and the continuity of grouting operations.

[0060] The key innovation is the flexible pre-tightening and anti-locking function achieved by the elastic washer 306 (such as a rubber pad) placed between the retaining ring assembly and the end face of the drill tail sleeve 100. Its presence ensures that when the drill tail sleeve 100 is tightened to its final position, the end face of the sleeve is not in rigid contact with the retaining ring assembly. Instead, a flexible axial pre-tightening force is generated by compressing the elastic washer 306. This flexible contact effectively avoids the locking phenomenon caused by "cold welding" or severe interlocking between metal parts due to direct rigid contact under vibration and rotation, greatly facilitating the subsequent disassembly of the drill tail sleeve 100.

[0061] An automatic limiting thread tightening mechanism is formed to protect the elastic element. The ingenious design lies in the fact that when the drill bit sleeve 100 engages with the external threaded connection end of the grouting mandrel 302, its final tightening position is not determined by the infinite screwing of the thread itself, but by the contact between the step of the inner hole of the drill bit sleeve 100 (or through other internal components) and the end face of the movable pad 306. Once contact is made, the thread stops screwing further in. At this time, the end face of the drill bit sleeve 100 precisely generates a small, preset compression on the elastic pad 306. This compression provides the necessary preload, but will not continue to increase due to continuous impact during subsequent drilling, thus limiting the working load of the elastic pad 306 within the design range, preventing plastic deformation or rapid fatigue damage due to overload, and significantly extending its service life.

[0062] The overall reliability of the system is comprehensively improved: the cooperation between the retaining ring assembly and the elastic washer ring 306 not only solves the independent problems of "anti-detachment" and "anti-locking" respectively, but also works together to form an axial connection interface with buffering and damping effects. This interface can absorb and attenuate some of the axial impact and vibration from drilling, reduce the dynamic load transmitted to the threaded connection pair and the retaining ring assembly itself, and provide additional protection for the long-term stable operation of the entire rotary grouting adapter.

[0063] In summary, the combined design of the retaining ring assembly and the elastic washer ring 306 simultaneously overcomes the two major problems of unreliable axial positioning and easy locking of connecting parts in a simple and efficient manner. It achieves stable, durable, and easy-to-maintain axial positioning through a combination of rigid stopping and flexible buffering, and is one of the core design features of this embodiment that enhances the overall reliability and ease of operation of the equipment.

[0064] Specifically, the grouting mandrel 302 in this embodiment includes a main shaft body 310. The outer diameter of the main shaft body 310 is larger than the outer diameter of the first connecting end 304 and the external threaded connecting end 305. The root of the external threaded connecting end 305 includes a connecting shaft section 308 and a variable diameter shaft section 309. The external threaded connecting end 305, the connecting shaft section 308, the variable diameter shaft section 309, and the main shaft body 310 are integrally formed. The outer diameter of the end of the variable diameter shaft section 309 that connects to the main shaft body 310 is larger than the outer diameter of the end that connects to the connecting shaft section 308. The retaining ring assembly includes a first retaining ring 307 installed on the main shaft body 310 and a second retaining ring 303 installed on the variable diameter shaft section 309. The second retaining ring 303 abuts against the first retaining ring 307. The elastic washer ring 306 is disposed between the second retaining ring 303 and the drill bit sleeve 100.

[0065] This embodiment also provides an anchor drilling device with the rotary grouting adapter 300, including: A drilling rig, the output end of which is fixedly connected to the first connecting end 304 of the grouting mandrel 302; The hollow anchor rod 200 is fixedly connected to the external threaded end of the grouting mandrel 302 via the drill tail sleeve 100.

[0066] Example 2 This embodiment provides a drill tail sleeve 100 suitable for the rotary grouting adapter of Embodiment 1, which optimizes and solves the technical problem of the grouting mandrel 302 of the rotary grouting adapter detaching from the drill tail sleeve 100. The specific technical solution is as follows: See Figures 8-13 As shown, a drill tail sleeve 100 of this embodiment includes: The sleeve 101 has a first internal threaded hole 103 at one end and a second internal threaded hole 104 at the other end. The internal threads of the first internal threaded hole 103 and the second internal threaded hole 104 have the same direction. The first internal threaded hole 103 is used to connect the hollow anchor rod 200, and the second internal threaded hole 104 is used to connect the external threaded connection end 305 of the grouting mandrel 302. The first internal threaded hole 103 has a first port and a second port, and the second internal threaded hole 104 has a third port and a fourth port. The second port and the fourth port are located inside the sleeve 101 and are connected through a connecting hole 105. The pad 106 is installed in the communicating hole 105 by the second internal connecting threaded hole 104; The anti-detachment inner ring 107 is detachably installed inside the sleeve 101 and located at the first port of the second inner connecting threaded hole 104. The anti-detachment inner ring 107 is used to prevent the external threaded connection end 305 of the grouting mandrel 302 from coming out of the second inner connecting threaded hole 104. The anti-detachment outer ring 102 is detachably installed on the sleeve body 101 outside the first port side of the second inner connecting threaded hole 104. The anti-detachment outer ring 102 is used to prevent the anti-detachment inner ring 107 from coming out of the sleeve body 101.

[0067] Based on the above technical solution, the drill tail sleeve 100 of this embodiment brings significant and multi-layered technical effects, specifically reflected in the following aspects: 1. It achieves efficient and reliable automatic disassembly, completely solving the problem of thread "seizing".

[0068] By providing a connecting hole 105 and a pad 106 inside the sleeve, and ensuring that the internal threads of the first internal connecting threaded holes 103 and the second internal connecting threaded holes 104 at both ends are in the same direction, after drilling is completed, the drilling rig is driven to reverse the grouting mandrel 302. The thread of the external threaded connection end 305 of the grouting mandrel 302 disengages from the pad 106, creating a small axial gap. This action directly removes the axial preload and locking force of the threaded pair between the anchor rod 200 and the drill tail sleeve 100, changing it from a "tightly engaged" state to a "loose" state. Therefore, by simply continuing to reverse the grouting mandrel 302, the drill tail sleeve 100 can be easily and automatically unscrewed from the anchor rod 200, greatly reducing the difficulty and labor intensity of disassembly, solving the long-standing disassembly problem that has plagued construction sites, and significantly improving work efficiency.

[0069] 2. A dual anti-detachment mechanism has been constructed to ensure absolute safety during operation.

[0070] In this embodiment, the drill tail sleeve 100 incorporates a synergistic anti-detachment structure consisting of an inner anti-detachment ring 107 and an outer anti-detachment ring 102. Located at the first port of the second inner connecting threaded hole 104, the inner anti-detachment ring 107 prevents the external threaded connection end 305 of the grouting mandrel 302 from dislodging from the second inner connecting threaded hole 104, acting like a "choke" structure. This fundamentally prevents the external threaded connection end 305 of the grouting mandrel 302 from completely unscrewing and falling out of the sleeve body 101 during reversal or vibration. The outer anti-detachment ring 102 provides axial constraint to the inner anti-detachment ring 107 from the outside, preventing it from being pushed out of the sleeve body 101 under stress. This dual locking design, with its inner and outer components complementing each other, ensures that while the core function can be easily disassembled, the external threaded connection end 305 of the grouting mandrel 302 is always reliably constrained within the drill tail sleeve 100. This completely eliminates the risk of personal injury and equipment damage that may result from the accidental ejection of the external threaded connection end 305 of the grouting mandrel 302, thus significantly improving safety.

[0071] 3. The modular, detachable anti-detachment ring design improves maintainability and reliability.

[0072] Both the inner anti-detachment ring 107 and the outer anti-detachment ring 102 are detachable. This design not only facilitates the assembly process by first assembling the external threaded connection end 305 of the grouting mandrel 302 with the inner anti-detachment ring 107 before inserting it into the sleeve 101, simplifying the assembly process, but also allows for independent replacement of the anti-detachment ring if it wears after long-term use, without scrapping the entire shank sleeve 100, resulting in low maintenance costs and good economic efficiency. Furthermore, the structure is compact, does not increase the overall axial dimension, is space-friendly, and all functional components are effectively integrated and protected. The overall structure is rigid, with excellent impact and fatigue resistance, making it suitable for harsh downhole working environments.

[0073] 4. It achieves a balance between convenience, security, and economy.

[0074] In summary, the drill bit sleeve 100 of this embodiment perfectly combines the previously difficult-to-balance requirements of "easy disassembly" and "anti-detachment." Through a simple mechanical linkage principle, it simplifies the process, allowing for safe disassembly with a single click by simply reversing the drilling rig, significantly shortening the process time and reducing worker skill requirements and physical exertion. Simultaneously, its durability and ease of maintenance reduce spare parts consumption and downtime. Overall, it optimizes the process flow of self-drilling anchor bolt construction, bringing higher construction efficiency, lower operational risks, and better comprehensive economic benefits to geotechnical anchoring projects.

[0075] As an optional embodiment, the inner anti-detachment ring 107 has an inner ring anti-detachment protrusion protruding into the second inner connecting threaded hole 104. The inner ring anti-detachment protrusion prevents the external threaded connection end 305 of the grouting mandrel 302 installed in the second inner connecting threaded hole 104 from dislodging. In this embodiment, the inner ring anti-detachment protrusion can be formed by the entire inner circumferential wall of the anti-detachment inner ring 107 protruding inward, or by a portion of the inner circumferential wall of the anti-detachment inner ring 107 protruding inward, as long as the inner ring anti-detachment protrusion prevents the external threaded connection end 305 of the grouting mandrel 302 installed in the second inner connecting threaded hole 104 from dislodging.

[0076] Since the inner anti-detachment ring 107 protrudes from the second inner connecting threaded hole 104, in order to install the inner anti-detachment ring 107 without affecting the assembly method of the external threaded connection end 305 of the existing grouting mandrel 302 and the second inner connecting threaded hole 104, the external threaded connection end 305 of the grouting mandrel 302 in this embodiment has an external threaded rod and a threaded rod root. The inner anti-detachment ring 107 includes multiple sub-inner rings 1071 and an inner ring connector 110. The multiple sub-inner rings 1071 are spliced ​​into a ring structure on the outer peripheral wall of the threaded rod root. The inner ring connector 110 surrounds the outer peripheral wall of the multiple sub-inner rings 1071 to form a complete inner anti-detachment ring 107. The sleeve 101 has an inner ring mounting hole 108 at the first port of the second inner connecting threaded hole 104. The external threaded connection end 305 of the grouting mandrel 302, which is equipped with the anti-detachment inner ring 107, passes through the inner ring mounting hole 108 and is threadedly connected to the second inner connecting threaded hole 104. The anti-detachment inner ring 107 is disposed in the inner ring mounting hole 108.

[0077] Based on the detailed design of the anti-detachment inner ring 107 structure and installation method described above, this technical solution produces the following significant and specific technical effects: 1. It innovatively solved the technological challenge of "assembly first, then constraint".

[0078] Because the anti-detachment inner ring 107 has an inwardly protruding anti-detachment structure, its inner diameter is smaller than the major diameter of the external threaded rod. If an integral inner ring is used, it cannot be directly fitted from the threaded end of the external threaded rod. This solution creatively designs the anti-detachment inner ring 107 as multiple splicable sub-inner rings 1071, allowing it to be assembled around the root of the threaded rod to form a complete annular structure, and then inserted as a whole into the inner ring mounting hole 108 of the sleeve body 101. This design cleverly avoids assembly interference caused by the major diameter of the threaded rod, realizing the assembly logic of "partial assembly first, then overall installation," enabling the drill tail sleeve 100 with built-in anti-detachment function to be smoothly assembled with the external threaded connection end 305 of the grouting mandrel 302 without changing the existing structure or assembly process of the external threaded connection end 305 of the grouting mandrel 302.

[0079] 2. The modular and maintainable design of the anti-detachment component has been achieved.

[0080] The anti-detachment inner ring 107 adopts a combination of a separate component (sub-inner ring 1071) and a fastener (inner ring connector 110). This modular design not only facilitates assembly but also allows for individual inspection, replacement, or maintenance of the sub-inner ring 1071 after long-term wear and tear, without replacing the entire drill bit sleeve 100 or sleeve body 101. The inner ring connector 110 (such as a wire retaining ring) is a standard, low-cost fastener that is also very easy to install and remove. This significantly reduces long-term maintenance costs and downtime, improving the overall economic efficiency of the product throughout its lifecycle.

[0081] In summary, the specific structure and installation scheme of the anti-detachment inner ring 107 successfully achieves the unity of anti-detachment function and convenient assembly at the physical level, and the unity of low cost and high efficiency at the maintenance level. It is a key design that enables the core invention concept to be engineered and put into practical use.

[0082] In this embodiment, the anti-detachment inner ring 107 has arc-shaped grooves on the outer peripheral wall of each of the sub-inner rings 1071. The arc-shaped grooves of multiple sub-inner rings are spliced ​​together to form an annular groove 109. The inner ring connector 110 clamps the ring to form a complete anti-detachment inner ring 107 within the annular groove 109.

[0083] The specific design of the anti-detachment inner ring 107 connection method in this embodiment brings the following significant and profound technical effects: 1. It achieves high reliability of connection and structural stability.

[0084] By creating arc-shaped grooves on the outer periphery of each sub-inner ring 1071, forming a continuous annular groove 109 after assembly, a precise and limiting installation position is provided for the inner ring connector 110 (such as a wire retaining ring). This "groove-hoop" fit ensures that the inner ring connector 110 can be firmly constrained within the annular groove 109, effectively preventing axial movement or circumferential rotation under vibration and impact. Compared to simple wrapping, this design tightly clamps multiple sub-inner rings 1071 radially and limits their axial movement with grooves, thus forming a rigid and integral composite anti-detachment inner ring 107. This ring can reliably withstand complex loads transmitted from the reverse rotation of the grouting mandrel 302 or working vibrations, eliminating the risk of loss of anti-detachment function due to connection failure.

[0085] 2. The assembly process has been optimized, improving assembly efficiency and consistency.

[0086] This design greatly simplifies the assembly process of the anti-detachment inner ring 107. During operation, simply position each sub-inner ring 1071 around the external threaded connection end 305 of the grouting mandrel 302, ensuring its arc-shaped grooves naturally align to form an annular groove 109. Then, insert the standard inner ring connector 110 into the groove to complete the locking. The entire process requires no special tools or complex operations, has low skill requirements for on-site assembly personnel, is fast, and ensures structural uniformity and quality stability after each assembly, which is beneficial for large-scale production and on-site maintenance.

[0087] 3. It ensures the compactness of the structure and the optimal utilization of functional space.

[0088] The connection structure is designed to be embedded in the annular groove 109, so that most of the volume of the inner ring connector 110 is accommodated inside the groove of the sub-inner ring 1071, rather than protruding completely from the outer circumference. This minimizes the overall radial dimension and irregular shape of the anti-detachment inner ring 107, allowing it to be inserted more smoothly into the inner ring mounting hole 108 of the sleeve 101, avoiding unnecessary installation interference. At the same time, the compact connection method also reduces the requirement for internal installation space in the sleeve, making it possible to design a lightweight and miniaturized overall structure.

[0089] 4. It is easy to disassemble and maintain, reflecting the design concept of maintainability.

[0090] When a sub-inner ring 1071 wears out and needs replacement, maintenance personnel can simply use simple tools to remove the inner ring connector 110 from the annular slot 109 to release the constraint on the sub-inner ring and quickly replace it. This design avoids scrapping the anti-detachment inner ring 107 as a single, disposable component and eliminates the need for destructive removal, significantly reducing maintenance costs and replacement time during long-term use and extending the service life of the core functional components of the drill bit sleeve.

[0091] In summary, the specific structure of the anti-detachment inner ring 107 based on "arc-shaped slot splicing" and "clamp connection" not only solves the problem of reliable connection of split rings in a clever and robust way, but also shows comprehensive advantages in terms of assembly convenience, space utilization and maintenance convenience. It is a key detail design that enables the anti-detachment function to be realized stably and for a long time.

[0092] Optionally, in this embodiment, the inner diameter of the anti-detachment inner ring 107 is smaller than the major diameter of the thread of the external threaded connection end 305 of the grouting mandrel 302, forming an inner ring anti-detachment protrusion protruding into the second inner connecting threaded hole 104.

[0093] As an optional implementation of this embodiment, the anti-detachment outer ring 102 has an outer ring anti-detachment protrusion 114, which protrudes from the inner ring mounting hole 108, preventing the anti-detachment inner ring 107 from detaching from the inner ring mounting hole 108. In this embodiment, the outer ring anti-detachment protrusion 114 can be formed by the entire inner peripheral wall of the anti-detachment outer ring 102 protruding inwards, or by a portion of the inner peripheral wall of the anti-detachment outer ring 102 protruding inwards, as long as the outer ring anti-detachment protrusion 114 prevents the anti-detachment inner ring 107 from detaching from the inner ring mounting hole 108.

[0094] Since the inner part of the anti-detachment outer ring 102 protrudes into the inner ring mounting hole 108, in order to install the anti-detachment outer ring 102 without affecting the assembly method of the external threaded connection end 305 of the existing grouting mandrel 302 and the second inner connecting threaded hole 104, the anti-detachment outer ring 102 includes multiple sub-outer rings 1021 and an outer ring connector 103. The multiple sub-outer rings 1021 are spliced ​​into a ring structure on the outer peripheral wall of the sleeve 101, and the outer ring connector 103 surrounds the outer peripheral wall of the multiple sub-outer rings 1021 to form a complete anti-detachment outer ring 102.

[0095] Based on the split structure design of the aforementioned anti-detachment outer ring 102, this technical solution brings the following key and practical technical effects: 1. Effectively solves the installation problem of the anti-detachment outer ring 102 with an inner convex structure in a limited space.

[0096] Because the anti-detachment outer ring 102 needs to have an inwardly protruding structure to block the anti-detachment inner ring 107, if an integral ring is used, the external threaded connection end 305 of the grouting mandrel 302 with the anti-detachment inner ring 107 is installed after the second internal connecting threaded hole 104, making it impossible to install the integral ring structure anti-detachment outer ring 102. This solution designs the anti-detachment outer ring 102 as being composed of multiple sub-outer rings 1021 spliced ​​together, allowing it to be directly assembled "in-situ" on the outer peripheral wall of the target position on the sleeve 101. This design completely avoids the physical obstacles that may be encountered during installation along the axial path, enabling the anti-detachment outer ring with the inwardly protruding function to be smoothly installed on the structurally complex sleeve, achieving a perfect unity of functional design and assembly process.

[0097] 2. Significantly improves the convenience and efficiency of assembly and maintenance.

[0098] The split-type outer ring 1021, combined with the outer ring connector 103 (such as clamps or wire retaining rings) for fastening, makes the entire installation process of the anti-detachment outer ring 102 simple and quick. Assembly or disassembly can be completed on the sleeve without special tools or complicated disassembly steps. This feature is particularly important for on-site replacement, maintenance, or periodic inspections, greatly reducing equipment downtime and operational difficulty, and improving construction efficiency.

[0099] 3. Ensures the stability and reliability of the anti-derailment restraint.

[0100] After multiple sub-outer rings 1021 are fastened together by outer ring connectors 103, a ring-shaped constraint structure with good integrity and rigidity is formed on the outer periphery of the sleeve 101. This structure can reliably withstand the axial thrust from the inner anti-detachment ring 107 and effectively transfer it to the sleeve 101, thereby stably achieving the core function of preventing the inner anti-detachment ring 107 from coming off. The existence of splice seams is compensated by connectors, ensuring the continuous load-bearing capacity of the structure.

[0101] 4. Improved maintainability and economy of components.

[0102] Compared to a single outer ring, the split design allows for the independent replacement of worn or damaged individual sub-outer rings 1021 without scrapping the entire anti-detachment outer ring 102 or the more valuable sleeve 101. This significantly reduces spare parts costs and maintenance expenses during long-term use, reflecting a sound maintainability design philosophy.

[0103] In summary, the anti-detachment outer ring 102 adopts a split-type splicing structure design, which is a key innovation that solves the feasibility of its own installation, ensures the reliability of the overall anti-detachment function, and at the same time takes into account the ease of assembly and the economy of maintenance.

[0104] Furthermore, in this embodiment, a limiting protrusion 113 is provided at the end of the outer peripheral wall of the sleeve 101. A plurality of sub-outer rings 1021 are spliced ​​on the limiting protrusion 113 of the sleeve 101 to form a ring structure. The anti-detachment outer ring 102 extends inward from the end near the inner ring mounting hole 108 to form the outer ring anti-detachment protrusion. The anti-detachment outer ring 102 extends inward from the end away from the inner ring mounting hole 108 to form the outer ring limiting protrusion 115. The outer ring limiting protrusion 115 is limited and abuts against the limiting protrusion 113.

[0105] Optionally, a first arc-shaped groove and a second arc-shaped groove are respectively opened at both ends of the outer peripheral wall of each of the sub-outer rings 1021. The first arc-shaped grooves of multiple sub-outer rings 1021 are spliced ​​together to form a first annular groove 111, and the second arc-shaped grooves of multiple sub-outer rings 1021 are spliced ​​together to form a second annular groove 112. The outer ring connector 103 is respectively clamped in the first annular groove 111 and the second annular groove 112 to form a complete anti-detachment outer ring 102.

[0106] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A rotary grouting adapter, characterized in that, include: Grouting sleeve with a hollow sleeve hole inside; The grouting mandrel is rotatably installed in the hollow sleeve of the grouting sleeve. The grouting mandrel has a first connecting end and a second connecting end that extend out of both ends of the hollow sleeve. The first connecting end is used to connect to the drilling rig, and the second connecting end is an external threaded connecting end used to connect to the hollow anchor rod. The grouting mandrel and the grouting sleeve are dynamically sealed together to form an annular sealed grouting chamber. The grouting sleeve is provided with a grouting pipe that communicates with the annular sealed grouting chamber. The grouting mandrel is provided with a grouting channel that communicates with the annular sealed grouting chamber and extends to the end of the external threaded connection.

2. A rotary grouting adapter according to claim 1, characterized in that, Includes a drill tail sleeve, and the external threaded connection end of the grouting mandrel is connected to the hollow anchor rod through the drill tail sleeve; One end of the drill bit sleeve has a first internal threaded hole, and the other end has a second internal threaded hole. The internal threads of the first and second internal threaded holes have the same direction. The first internal threaded hole is threadedly connected to the hollow anchor rod, and the second internal threaded hole is threadedly connected to the external threaded end of the grouting mandrel.

3. A rotary grouting adapter according to claim 2, characterized in that, The first internal connecting threaded hole has a first port and a second port, and the second internal connecting threaded hole has a third port and a fourth port. The second port and the fourth port are located inside the drill bit sleeve and are connected through a connecting hole. A movable pad is installed inside the connecting hole.

4. A rotary grouting adapter according to claim 3, characterized in that, The major diameter of the thread at the external threaded connection end of the grouting mandrel is greater than the major diameter of the thread of the hollow anchor rod. The inner diameter of the second internal threaded hole is greater than the inner diameter of the first internal threaded hole. The diameter of the connecting hole is slightly greater than or equal to the inner diameter of the second internal threaded hole. A limiting step is formed between the connecting hole and the first internal threaded hole. The movable pad is installed in the connecting hole by the second internal threaded hole and is stopped and limited by the limiting step.

5. A rotary grouting adapter according to claim 4, characterized in that, The grouting channel includes a radial grouting channel arranged radially along the grouting mandrel and an axial grouting channel arranged axially along the grouting mandrel. One end of the radial grouting channel is connected to the annular sealed grouting chamber, and the other end is connected to the axial grouting channel. The axial grouting channel extends to the end of the external threaded connection and communicates with the outside. The movable pad has a hollow pad channel inside, and the hollow anchor has a hollow anchor channel inside. The axial grouting channel, the hollow pad channel, and the hollow anchor channel are connected in sequence.

6. A rotary grouting adapter according to claim 2, characterized in that, The device includes a retaining ring assembly, which is mounted on the grouting mandrel and located on one side of the grouting sleeve to prevent the grouting sleeve from dislodging from the grouting mandrel. The retaining ring assembly is located near the root of the external threaded connection end, and an elastic washer is provided between the retaining ring assembly and the drill tail sleeve.

7. A rotary grouting adapter according to claim 6, characterized in that, The grouting mandrel includes a main shaft body, the outer diameter of which is larger than the outer diameter of the first connecting end and the external threaded connecting end. The root of the external threaded connecting end includes a connecting shaft section and a variable diameter shaft section. The external threaded connecting end, the connecting shaft section, the variable diameter shaft section, and the main shaft body are integrally formed. The outer diameter of the end of the variable diameter shaft section that connects to the main shaft body is larger than the outer diameter of the end that connects to the connecting shaft section. The retaining ring assembly includes a first retaining ring mounted on the main shaft and a second retaining ring mounted on the variable diameter shaft section. The second retaining ring abuts against the first retaining ring, and the elastic washer is disposed between the second retaining ring and the drill bit sleeve.

8. A rotary grouting adapter according to claim 2, characterized in that, The drill tail sleeve includes: A sleeve body, wherein one end of the sleeve body has the first internal connecting threaded hole and the other end has the second internal connecting threaded hole; An anti-detachment inner ring is detachably installed inside the sleeve and located at the first port of the second inner connecting threaded hole. The anti-detachment inner ring is used to prevent the external threaded connection end of the grouting mandrel from coming out of the second inner connecting threaded hole. An anti-detachment outer ring is detachably installed on the sleeve body outside the first port side of the second inner connecting threaded hole. The anti-detachment outer ring is used to prevent the anti-detachment inner ring from coming out of the sleeve body.

9. A rotary grouting adapter according to claim 8, characterized in that, The external threaded connection end has an external threaded rod and a threaded rod root. The anti-detachment inner ring includes multiple sub-inner rings and an inner ring connecting body. The multiple sub-inner rings are spliced ​​together on the outer peripheral wall of the threaded rod root to form a ring structure. The inner ring connecting body surrounds the outer peripheral wall of the multiple sub-inner rings to form a complete anti-detachment inner ring. An inner ring mounting hole is formed inside the sleeve at the first port of the second inner connecting threaded hole. The external threaded connection end of the anti-detachment inner ring is installed through the inner ring mounting hole and is threadedly connected to the second inner connecting threaded hole. The anti-detachment inner ring is set inside the inner ring mounting hole. The outer peripheral wall end of the sleeve is provided with a limiting protrusion ring. The anti-detachment outer ring includes multiple sub-outer rings and an outer ring connector. The multiple sub-outer rings are spliced ​​together on the limiting protrusion ring of the sleeve to form a ring structure. The outer ring connector surrounds the outer peripheral wall of the multiple sub-outer rings to form a complete anti-detachment outer ring. The anti-detachment outer ring extends inward from the end near the inner ring mounting hole to form an outer ring anti-detachment protrusion. The anti-detachment outer ring extends inward from the end away from the inner ring mounting hole to form an outer ring limiting protrusion. The outer ring limiting protrusion abuts against the limiting protrusion ring.

10. An anchor drilling device having a rotary grouting adapter as described in any one of claims 1-9, characterized in that, include: A drilling rig, wherein the output end of the drilling rig is fixedly connected to the first connecting end of the grouting mandrel; The hollow anchor rod is fixedly connected to the external threaded end of the grouting mandrel via a drill tail sleeve.

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