Self-drilling injection anchor pipe anchoring device and method for coal mines

Abstract

A self-drilling injection anchor pipe anchoring device and method for coal mines, comprising an anchor pipe, a disposable drill bit, a tray, a nut, an anchor A material grouting assembly, an anchor B material grouting assembly and a slurry mixing tee joint, wherein the disposable drill bit is coaxially installed at the front end of the anchor pipe, the disposable drill bit and the anchor pipe are inserted into the borehole, the rear end of the anchor pipe extends out of the borehole, the tray is sleeved on the anchor pipe, the nut is threadedly connected to the rear end of the anchor pipe, the rear end of the nut is crimped with the front end of the tray, a front-to-back transparent grouting center channel is opened inside the disposable drill bit and the anchor pipe, the outlet end of the slurry mixing tee joint is connected to the rear port of the anchor pipe, and the two inlet ends of the slurry mixing tee joint are respectively connected to the outlets of the anchor A material grouting assembly and the anchor B material grouting assembly. The invention has simple process, flexible operation, high construction efficiency, saves the process of drilling and withdrawing the drill rod, is convenient for conveying the anchoring agent, and the resin ring formed after the anchoring agent is injected has uniform thickness and good anchoring effect.

Description

Technical Field

[0001] The invention belongs to the technical field of mining engineering, and in particular relates to a self-drilling injection anchor pipe anchoring device and method for coal mines. Background Art

[0002] Anchor net cables with anchor rods as the main body are the most commonly used support technology in underground coal mine tunnels, accounting for more than 90%. Millions of anchor rods are constructed every year, so improving the construction efficiency of anchor rods is of great significance.

[0003] The length of the anchor rod is generally about 2m, and it is mainly used for anchoring the top plate and the two sides of the tunnel. The current construction process is: use an anchor drill or a bolter drill arm to drill holes, and the length of the drill rod is generally 1.0~2.0m. Therefore, generally 1~3 drill rods are needed to complete the drilling construction, and then the drill rods are withdrawn one by one; the anchoring agent is sent into the borehole, and the anchor rod is pushed into the bottom of the hole by the drill rig, and the anchor is rotated and stirred. After the anchor solidifies, the tray and screws are installed and tightened to complete the anchoring. The construction time of a single anchor rod is about 5~10 minutes. When the coal rock mass in the anchoring area is relatively broken or the stress is high, after the anchor drilling construction is completed and the drill rod is withdrawn, the borehole will be deformed or even collapsed, making it difficult to send the anchor and the anchor rod or waste the hole. Therefore, the anchor construction process is long and the time is long. The difficulty of automatically aligning the anchor and the anchor with the borehole and automatically pushing them in is the main disadvantage of the existing technology, and it is also the key link restricting the application of automatic anchoring technology in coal mines. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a self-drilling injection anchor pipe anchoring device and method for coal mines which has simple operation, fewer construction processes, high efficiency and good anchoring effect.

[0005] To solve the above technical problems, the present invention adopts the following technical scheme: a self-drilling injection anchor pipe anchoring device for coal mines, comprising an anchor pipe, a disposable drill bit, a tray, a nut, an anchor A material grouting assembly, an anchor B material grouting assembly and a slurry mixing tee joint, the disposable drill bit is coaxially installed at the front end of the anchor pipe, the disposable drill bit and the anchor pipe extend into the drill hole, the rear end of the anchor pipe extends out of the drill hole, the tray is sleeved on the anchor pipe, the nut is threadedly connected to the rear end of the anchor pipe, the rear end of the nut is crimped with the front end of the tray, a front-to-back transparent grouting center channel is opened inside the disposable drill bit and the anchor pipe, the slurry mixing tee joint has an outlet end and two inlet ends, the outlet end of the slurry mixing tee joint is connected to the rear port of the anchor pipe, and the two inlet ends of the slurry mixing tee joint are respectively connected to the outlets of the anchor A material grouting assembly and the anchor B material grouting assembly.

[0006] The rear end of the disposable drill bit extends into and is threadedly connected in the front port of the anchor pipe; the rear end of the anchor pipe is a first external hexagonal structure on the rear side of the external thread.

[0007] The slurry mixing three-way joint includes a first feed pipe, a second feed pipe and a discharge pipe. The outlet end of the first feed pipe, the outlet end of the second feed pipe and the inlet end of the discharge pipe are connected to form a Y-shaped structure. The outlet end of the first feed pipe and the second feed pipe are symmetrical about the center line of the discharge pipe. The angle between the outlet end of the first feed pipe and the second feed pipe is an acute angle. A first orifice plate is provided inside the inlet end of the discharge pipe, and a plurality of first feeding holes are provided on the first orifice plate. A second orifice plate perpendicular to and connected to the first orifice plate is provided at the connection between the outlet end of the first feed pipe and the outlet end of the second feed pipe, and a plurality of second feeding holes are provided on the second orifice plate. The discharge end of the discharge pipe extends into and is threadedly connected to the rear port of the anchor pipe. The center line of the first feeding hole connected with the first feed pipe is parallel to the center line of the first feed pipe, and the center line of the first feeding hole connected with the second feed pipe is parallel to the center line of the second feed pipe.

[0008] The anchoring agent A material grouting assembly includes an anchoring agent A material barrel and an A material grouting pump. The anchoring agent A material barrel is connected to the feed port of the first feed pipe of the slurry mixing three-way joint through the A material injection pipe, and the A material grouting pump is arranged on the A material injection pipe.

[0009] The anchor B material grouting assembly includes an anchor B material barrel and a B material grouting pump. The anchor B material barrel is connected to the feed port of the second feed pipe of the slurry mixing three-way joint through the B material injection pipe, and the B material grouting pump is arranged on the B material injection pipe.

[0010] The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines comprises the following steps:

[0011] (1) Use an anchor drill or anchor drilling arm to drill holes in coal and rock formations using anchor pipes and disposable drill bits as drilling tools;

[0012] (2) After the anchor pipe is drilled, the outlet pipe of the slurry mixing tee joint is connected to the rear port of the anchor pipe, the outlet of the material A injection pipe of the anchor material A grouting assembly is connected to the feed port of the first feed pipe, and the outlet of the material B injection pipe of the anchor material B grouting assembly is connected to the feed port of the second feed pipe;

[0013] (3) Start the A material grouting pump of the anchoring agent A material grouting assembly and the B material grouting pump of the anchoring agent B material grouting assembly. The A material grouting pump injects the A material in the anchoring agent A material barrel into the bottom of the borehole. The B material grouting pump injects the B material in the anchoring agent B material barrel into the bottom of the borehole. When the amount of anchoring agent injected reaches the set amount, stop the A material grouting pump and the B material grouting pump;

[0014] (4) Unscrew the discharge pipe of the slurry mixing tee joint from the rear port of the anchor pipe;

[0015] (5) Use an anchor drill or anchor drilling arm to drive the anchor pipe to rotate. During the rotation of the anchor pipe and the drill bit, the anchoring agent A and B materials are evenly mixed to produce a chemical reaction. The anchoring agent then bonds the disposable drill bit and the anchoring section of the anchor pipe to the inner wall of the borehole;

[0016] (6) After the anchoring agent has fully solidified, tighten the nut to the designed torque. The nut presses the tray, and the tray presses the tunnel wall at the borehole opening. The anchoring preload is applied to complete the anchoring construction work.

[0017] The specific process of step (1) is as follows: before drilling, the tray and the nut are first installed on the anchor pipe, and the first spline converter is used to connect with the rotating mechanism of the drilling rig or the drill arm, and torque is applied to the anchor pipe to complete the construction of anchor pipe drilling; one end of the first spline converter is a second external hexagonal structure connected to the rotating mechanism of the drilling rig or the drill arm, and the wall of the inner hole of the other end of the first spline converter is provided with a first spline internal tooth, and the first external hexagonal structure at the rear end of the anchor pipe is plugged into the inner hole of the first spline converter and meshed with the first spline internal tooth to transmit torque.

[0018] In step (3), the flow rates of the material A grouting pump and the material B grouting pump are determined according to the ratio of the specific type of anchoring agent, or a proportional double-liquid grouting pump is directly used to achieve the ratio of materials A and B;

[0019] In step (3), when material A and material B pass through the slurry mixing tee joint, they are preliminarily mixed. The specific mixing method is that a part of the material A in the first feed pipe enters the second feed pipe through the second feed hole on the second orifice plate to be mixed with material B, and a part of the material B in the second feed pipe enters the first feed pipe through the second feed hole on the second orifice plate to be mixed with material A; material A and material B enter the discharge pipe through the first feed hole on the first orifice plate. Since the first feed hole is inclined, material A and material B are also mixed in the discharge pipe after passing through the first feed hole. Finally, they enter the bottom of the borehole from the front port of the disposable drill bit through the grouting center channel, thereby filling the annular cavity between the disposable drill bit, the drill rod and the inner wall of the borehole.

[0020] In step (5), the anchor drill or anchor drilling arm is used to drive the anchor pipe to rotate, and the first spline converter used in step (1) is also used.

[0021] In step (6), the nut is tightened to the designed torque, and a second spline converter is used as a torque transmission component. The second spline converter is a rod-shaped structure with a transparent inner hole in the center. One end of the second spline converter is a third outer hexagonal structure connected to a drilling rig or a drill arm rotating mechanism. A second spline inner tooth is arranged on the hole wall at the other end of the inner hole of the second spline converter. The first outer hexagonal structure at the rear end of the anchor pipe extends into the inner hole of the second spline converter. The second spline inner tooth meshes with the outer hexagonal structure of the nut. The drilling rig or the drill arm rotating mechanism drives the nut to rotate through the second spline converter to apply a preload.

[0022] By adopting the above technical scheme, after the anchor pipe is drilled, the anchor A material grouting assembly and the anchor B material grouting assembly respectively inject the anchor A material and the anchor B material into the inner hole of the anchor pipe and flow out through the inner hole of the disposable drill bit. When passing through the slurry mixing tee joint, the A material and the B material are preliminarily mixed to fill the annular gap between the inner wall of the anchor section borehole and the outer circle of the anchor pipe. The anchor pipe is driven to continue rotating through the first spline converter to achieve stirring and mixing of the anchor agent. The anchor pipe rotation is stopped after the mixture is evenly mixed. After the anchor agent solidifies, the second spline converter is switched to pre-tighten the nut on the tray, thereby realizing the rapid anchoring of the anchor pipe by the self-drilling rig.

[0023] The present invention changes the anchor rod commonly used in coal mines into an anchor pipe with a hollow structure, realizes the self-drilling and rapid anchoring of the anchor pipe for coal mines, simplifies the complex processes of existing anchor construction such as drill rod segmented drilling, drill rod segmented withdrawal, anchor agent pushing (if necessary, secondary pushing), and anchor tightening into three processes of anchor pipe self-drilling, anchor agent injection, and anchor tightening, reduces the links of drill rod segmented drilling, segmented withdrawal and anchor agent pushing, greatly saves anchor rod construction time, and improves construction efficiency; in areas where coal and rock masses are broken, borehole deformation or hole collapse often occurs after the drill rod is withdrawn, making it difficult for the anchor agent and anchor rod to enter or even directly becoming a waste hole, while the anchor pipe self-drilling method completely solves the hole collapse problem; in addition, the key issue of the current intelligent excavation and anchoring technology is automated anchoring, and the use of self-drilling injection anchoring avoids the difficulty of automatically aligning the anchor agent and anchor rod with the borehole and automatically pushing them in by mechanical means, provides technical support for the realization of automatic anchoring technology, and has broad application prospects.

[0024] During the drilling operation, water jet drilling or mechanical drilling rig is selected according to the specific tunnel surrounding rock strength and lithology. Mechanical drilling rigs are used for drilling of general coal or weak rock mass, and water jet or abrasive water jet drilling is used for drilling of rock mass with medium hardness or above. The abrasive water jet generator uses the technical support of the patent (ZL201920842666.X) and the water jet drilling patent (ZL202020789824.2). Therefore, the specific method of water jet self-drilling technology is not repeated here. The water jet generator can generate high-pressure water jet or high-pressure abrasive water jet, which is transported to the hollow anchor pipe by pipeline, and sprayed from the nozzle through the inner hole of the anchor pipe. The anchor pipe is pushed forward by the anchor drilling rig or the anchor drilling vehicle drill arm to rotate and drill. The high-pressure water jet realizes the rotary rock breaking of the coal rock mass or the mechanical drill bit rock breaking, thereby realizing the self-drilling of the anchor pipe (that is, the anchor pipe replaces the drill rod).

[0025] The present invention only describes the mechanical self-drilling method and the injection anchoring technology.

[0026] In summary, the present invention has the following beneficial effects:

[0027] (1) The present invention uses a hollow anchor pipe instead of an anchor rod, which is used as a drill rod during the drilling process. Water jet drilling technology or a mechanical disposable drill bit is used for drilling. The anchoring agent is injected from the inner hole of the anchor pipe to the bottom of the borehole by injection, thereby realizing self-drilling and rapid anchoring of the anchor pipe.

[0028] (2) The method and device used in the present invention save the process of drilling in and out of the drill rod, are simple to operate, and are easy to realize automatic control, thereby greatly improving the construction efficiency.

[0029] (3) The anchor pipe of the present invention is used as a drilling tool, which is drilled and pushed to the bottom of the hole in one time. There is no step of withdrawing the drill rod or the anchor rod. After the hole is formed, it is always supported by the anchor pipe and is not affected by the deformation and collapse of the hole. It is particularly suitable for anchoring construction in broken coal and rock areas.

[0030] (4) The anchoring agent of the present invention is injected into the drill hole from the inner hole of the anchor pipe, and there is no problem of difficulty in delivering the drug roll anchoring agent.

[0031] (5) Use a mechanical one-shot drill bit for drilling. Since the diameter of the drill bit is close to the diameter of the borehole, the anchor pipe is basically concentric with the borehole and is not easy to be eccentric. The resin ring formed after the anchor agent is injected has a uniform thickness and a good anchoring effect.

[0032] (6) The slurry mixing tee joint serves to collect and preliminarily mix material A and material B, thereby reducing the stirring time of the anchor pipe and improving the mixing effect of the anchoring agent.

[0033] (7) The process of the present invention is simple, the operation is flexible, and the construction efficiency is high. It is particularly suitable as one of the key technologies to be used in conjunction with an intelligent all-in-one digging and anchoring machine for automated or intelligent anchor (pipe) construction in coal mines, and has great value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 yes Figure 1 Schematic diagram of the appearance and structure of the middle anchor pipe, tray and nut;

[0036] Figure 3 It is a schematic diagram of the axial cross-sectional structure of the anchor pipe, tray and nut;

[0037] Figure 4 yes Figure 1 Axial cross-sectional view of the tee joint for mixing medium slurry;

[0038] Figure 5 is a schematic diagram of the three-dimensional structure of the first spline converter;

[0039] Figure 6 It is a schematic diagram of the three-dimensional structure of the second spline converter. DETAILED DESCRIPTION

[0040] like Figure 1-Figure 6 As shown, the self-drilling injection anchor pipe anchoring device for coal mines of the present invention comprises an anchor pipe 2, a disposable drill bit 1, a tray 3, a nut 4, an anchor A material grouting assembly, an anchor B material grouting assembly and a slurry mixing tee joint 7, the disposable drill bit 1 is coaxially installed at the front end of the anchor pipe 2, the disposable drill bit 1 and the anchor pipe 2 extend into the borehole, the rear end of the anchor pipe 2 extends out of the borehole, the tray 3 is sleeved on the anchor pipe 2, the nut 4 is threadedly connected to the rear end of the anchor pipe 2, the rear end of the nut 4 is crimped with the front end of the tray 3, a front-to-back transparent grouting center channel 8 is opened inside the disposable drill bit 1 and the anchor pipe 2, the slurry mixing tee joint 7 has an outlet end and two inlet ends, the outlet end of the slurry mixing tee joint 7 is connected to the rear port of the anchor pipe 2, and the two inlet ends of the slurry mixing tee joint 7 are respectively connected to the outlets of the anchor A material grouting assembly and the anchor B material grouting assembly.

[0041] The rear end of the disposable drill bit 1 extends into and is threadedly connected to the front end of the anchor pipe 2; the rear end of the anchor pipe 2 is a first external hexagonal structure 9 on the rear side of the external thread.

[0042] The slurry mixing three-way joint 7 includes a first feed pipe 10, a second feed pipe 11 and a discharge pipe 12. The outlet end of the first feed pipe 10, the outlet end of the second feed pipe 11 and the inlet end of the discharge pipe 12 are connected to form a Y-shaped structure. The outlet end of the first feed pipe 10 and the second feed pipe 11 are symmetrical about the center line of the discharge pipe 12. The angle between the outlet end of the first feed pipe 10 and the second feed pipe 11 is an acute angle. A first orifice plate 13 is provided inside the inlet end of the discharge pipe 12. A plurality of first material holes 1 are provided on the first orifice plate 13. 4. A second orifice plate 15 which is perpendicular to and connected to the first orifice plate 13 is provided at the connection between the outlet end of the first feed pipe 10 and the outlet end of the second feed pipe 11. A plurality of second feed holes 16 are provided on the second orifice plate 15. The discharge end of the discharge pipe 12 extends into and is threadedly connected to the rear port of the anchor pipe 2. The center line of the first feed hole 14 which is connected to the first feed pipe 10 is parallel to the center line of the first feed pipe 10, and the center line of the first feed hole 14 which is connected to the second feed pipe 11 is parallel to the center line of the second feed pipe 11.

[0043] The anchoring agent A material grouting assembly includes an anchoring agent A material barrel 17 and an A material grouting pump 18. The anchoring agent A material barrel 17 is connected to the feed port of the first feed pipe 10 of the slurry mixing three-way joint 7 through the A material injection pipe 19, and the A material grouting pump 18 is arranged on the A material injection pipe 19.

[0044] The anchor B material grouting assembly includes an anchor B material barrel 20 and a B material grouting pump 21. The anchor B material barrel 20 is connected to the feed port of the second feed pipe 11 of the slurry mixing three-way joint 7 through a B material injection pipe 22, and the B material grouting pump 21 is arranged on the B material injection pipe 22.

[0045] The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines comprises the following steps:

[0046] (1) using an anchor drill or anchor drilling arm, using an anchor pipe 2 and a disposable drill bit 1 as drilling tools to drill holes in coal and rock formations;

[0047] (2) After the anchor pipe 2 is drilled, the discharge pipe 12 of the slurry mixing tee joint 7 is connected to the rear port of the anchor pipe 2, the discharge port of the A material injection pipe 19 of the anchor A material grouting assembly is connected to the feed port of the first feed pipe 10, and the discharge port of the B material injection pipe 22 of the anchor B material grouting assembly is connected to the feed port of the second feed pipe 11;

[0048] (3) Start the A material grouting pump 18 of the anchoring agent A material grouting assembly and the B material grouting pump 21 of the anchoring agent B material grouting assembly. The A material grouting pump 18 injects the A material in the anchoring agent A material barrel 17 into the bottom of the borehole 23. The B material grouting pump 21 injects the B material in the anchoring agent B material barrel 20 into the bottom of the borehole 23. When the amount of anchoring agent injected reaches the set amount, stop the A material grouting pump 18 and the B material grouting pump 21.

[0049] (4) Unscrew the discharge pipe 12 of the slurry mixing tee joint 7 from the rear port of the anchor pipe 2;

[0050] (5) Using an anchor drill or anchor drilling arm, the anchor pipe 2 is driven to rotate. During the rotation of the anchor pipe 2 and the drill bit, the anchoring agent A and the anchoring agent B are evenly mixed to produce a chemical reaction. The anchoring agent then bonds the disposable drill bit 1 and the anchoring section of the anchor pipe 2 to the inner wall of the borehole 23.

[0051] (6) After the anchoring agent 25 is fully solidified, the nut 4 is tightened to the designed torque. The nut 4 presses the tray 3, and the tray 3 presses the tunnel wall 24 at the opening of the drill hole 23. The anchoring preload force is applied to complete the anchoring construction operation.

[0052] The specific process of step (1) is as follows: before drilling, the tray 3 and the nut 4 are first installed on the anchor pipe 2, and the first spline converter 5 is used to connect with the rotating mechanism of the drilling rig or the drill arm, and torque is applied to the anchor pipe 2 to complete the construction of the anchor pipe 2 drilling; one end of the first spline converter 5 is a second external hexagonal structure 5-1 connected to the rotating mechanism of the drilling rig or the drill arm, and the wall of the inner hole of the other end of the first spline converter 5 is provided with a first spline internal tooth 5-2, and the first external hexagonal structure 9 at the rear end of the anchor pipe 2 is plugged into the inner hole of the first spline converter 5 and meshes with the first spline internal tooth 5-2 to transmit torque.

[0053] In step (3), the flow rates of the material A grouting pump 18 and the material B grouting pump 21 are determined according to the ratio of the specific type of anchoring agent, or a proportional dual-liquid grouting pump is directly used to achieve the ratio of materials A and B;

[0054] In step (3), when material A and material B pass through the slurry mixing tee joint 7, they are preliminarily mixed. The specific mixing method is that a part of the material A in the first feed pipe 10 enters the second feed pipe 11 through the second feed hole 16 on the second orifice plate 15 to be mixed with the material B, and a part of the material B in the second feed pipe 11 enters the first feed pipe 10 through the second feed hole 16 on the second orifice plate 15 to be mixed with the material A; the material A and the material B enter the discharge pipe 12 through the first feed hole 14 on the first orifice plate 13. Since the first feed hole 14 is arranged obliquely, the material A and the material B are also mixed to a certain extent in the discharge pipe 12 after passing through the first feed hole 14, and finally enter the bottom of the borehole 23 from the front port of the disposable drill bit 1 through the grouting central channel 8, thereby filling the annular cavity between the disposable drill bit 1, the drill rod and the inner wall of the borehole 23.

[0055] In step (5), the anchor drill or anchor drilling arm is used to drive the anchor pipe 2 to rotate, and the first spline converter 5 used in step (1) is also used.

[0056] In step (6), the nut 4 is tightened to the designed torque, and the second spline converter 6 is used as a torque transmission component. The second spline converter 6 is a rod-shaped structure with a transparent inner hole in the center. One end of the second spline converter 6 is a third outer hexagonal structure 6-1 connected to the drilling rig or drill arm rotation mechanism. The hole wall at the other end of the inner hole of the second spline converter 6 is provided with a second spline inner tooth 6-2. The first outer hexagonal structure 9 at the rear end of the anchor pipe 2 extends into the inner hole of the second spline converter 6, and the second spline inner tooth 6-2 is meshed with the outer hexagonal of the nut 4. The drilling rig or drill arm rotation mechanism drives the nut 4 to rotate through the second spline converter 6 to apply a preload.

[0057] The anchoring agent A material, anchoring agent B material and grouting pump in the present invention are all existing commonly used anchoring agents, and the specific materials are not described in detail.

[0058] This embodiment does not impose any formal limitation on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A self-drilling injection anchor pipe anchoring device for coal mines, characterized in that: It comprises an anchor pipe, a disposable drill bit, a tray, a nut, an anchor A material grouting component, an anchor B material grouting component and a slurry mixing three-way joint, the disposable drill bit is coaxially installed at the front end of the anchor pipe, the disposable drill bit and the anchor pipe are inserted into the drill hole, the rear end of the anchor pipe extends out of the drill hole, the tray is sleeved on the anchor pipe, the nut is threadedly connected to the rear end of the anchor pipe, the rear end of the nut is crimped with the front end of the tray, the disposable drill bit and the anchor pipe are provided with a front-to-back transparent grouting central channel, the slurry mixing three-way joint has an outlet end and two inlet ends, the outlet end of the slurry mixing three-way joint is connected to the rear port of the anchor pipe, and the two inlet ends of the slurry mixing three-way joint are respectively connected to the outlets of the anchor A material grouting component and the anchor B material grouting component; The rear end of the disposable drill bit extends into and is threadedly connected to the front port of the anchor pipe; the rear end of the anchor pipe is a first external hexagonal structure on the rear side of the external thread; The slurry mixing three-way joint comprises a first feed pipe, a second feed pipe and a discharge pipe, the outlet end of the first feed pipe, the outlet end of the second feed pipe and the inlet end of the discharge pipe are connected to form a Y-shaped structure, the outlet end of the first feed pipe and the second feed pipe are symmetrical about the center line of the discharge pipe, the angle between the outlet end of the first feed pipe and the second feed pipe is an acute angle, a first orifice plate is provided inside the inlet end of the discharge pipe, a plurality of first feeding holes are provided on the first orifice plate, a second orifice plate perpendicular to and connected to the first orifice plate is provided at the connection between the outlet end of the first feed pipe and the outlet end of the second feed pipe, a plurality of second feeding holes are provided on the second orifice plate, the discharge end of the discharge pipe extends into and is threadedly connected to the rear port of the anchor pipe; the center line of the first feeding hole connected with the first feed pipe is parallel to the center line of the first feed pipe, and the center line of the first feeding hole connected with the second feed pipe is parallel to the center line of the second feed pipe; The anchoring agent A material grouting assembly comprises an anchoring agent A material barrel and an A material grouting pump. The anchoring agent A material barrel is connected to the feed port of the first feed pipe of the slurry mixing tee joint through the A material injection pipe. The A material grouting pump is arranged on the A material injection pipe. The anchor B material grouting assembly includes an anchor B material barrel and a B material grouting pump. The anchor B material barrel is connected to the feed port of the second feed pipe of the slurry mixing three-way joint through the B material injection pipe, and the B material grouting pump is arranged on the B material injection pipe.

2. An anchoring method using the self-drilling injection anchor pipe anchoring device for coal mines as claimed in claim 1, characterized in that: The following steps are included: (1) Use an anchor drill or anchor drilling arm to drill holes in coal and rock formations using anchor pipes and disposable drill bits as drilling tools; (2) After the anchor pipe is drilled, the outlet pipe of the slurry mixing tee joint is connected to the rear port of the anchor pipe, the outlet of the material A injection pipe of the anchor material A grouting assembly is connected to the feed port of the first feed pipe, and the outlet of the material B injection pipe of the anchor material B grouting assembly is connected to the feed port of the second feed pipe; (3) Start the A material grouting pump of the anchoring agent A material grouting assembly and the B material grouting pump of the anchoring agent B material grouting assembly. The A material grouting pump injects the A material in the anchoring agent A material barrel into the bottom of the borehole. The B material grouting pump injects the B material in the anchoring agent B material barrel into the bottom of the borehole. When the amount of anchoring agent injected reaches the set amount, stop the A material grouting pump and the B material grouting pump; (4) Unscrew the discharge pipe of the slurry mixing tee joint from the rear port of the anchor pipe; (5) Use an anchor drill or anchor drilling arm to drive the anchor pipe to rotate. During the rotation of the anchor pipe and the drill bit, the anchoring agent A and B materials are evenly mixed to produce a chemical reaction. The anchoring agent then bonds the disposable drill bit and the anchoring section of the anchor pipe to the inner wall of the borehole; (6) After the anchoring agent has fully solidified, tighten the nut to the designed torque. The nut presses the tray, and the tray presses the tunnel wall at the borehole opening. The anchoring preload is applied to complete the anchoring construction work.

3. The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines according to claim 2, characterized in that: The specific process of step (1) is as follows: before drilling, the tray and the nut are first installed on the anchor pipe, and the first spline converter is used to connect with the rotating mechanism of the drilling rig or the drill arm, and torque is applied to the anchor pipe to complete the construction of anchor pipe drilling; one end of the first spline converter is a second external hexagonal structure connected to the rotating mechanism of the drilling rig or the drill arm, and the wall of the inner hole of the other end of the first spline converter is provided with a first spline internal tooth, and the first external hexagonal structure at the rear end of the anchor pipe is plugged into the inner hole of the first spline converter and meshed with the first spline internal tooth to transmit torque.

4. The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines according to claim 3 is characterized in that: In step (3), the flow rates of the material A grouting pump and the material B grouting pump are determined according to the ratio of the specific type of anchoring agent, or a proportional double-liquid grouting pump is directly used to achieve the ratio of materials A and B; In step (3), when material A and material B pass through the slurry mixing tee joint, they are preliminarily mixed. The specific mixing method is that a part of the material A in the first feed pipe enters the second feed pipe through the second feed hole on the second orifice plate to be mixed with material B, and a part of the material B in the second feed pipe enters the first feed pipe through the second feed hole on the second orifice plate to be mixed with material A; material A and material B enter the discharge pipe through the first feed hole on the first orifice plate. Since the first feed hole is inclined, material A and material B are also mixed in the discharge pipe after passing through the first feed hole. Finally, they enter the bottom of the borehole from the front port of the disposable drill bit through the grouting center channel, thereby filling the annular cavity between the disposable drill bit, the drill rod and the inner wall of the borehole.

5. The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines according to claim 4, characterized in that: In step (5), the anchor drill or anchor drilling arm is used to drive the anchor pipe to rotate, and the first spline converter used in step (1) is also used.

6. The anchoring method of the self-drilling injection anchor pipe anchoring device for coal mines according to claim 4, characterized in that: In step (6), the nut is tightened to the designed torque, and a second spline converter is used as a torque transmission component. The second spline converter is a rod-shaped structure with a transparent inner hole in the center. One end of the second spline converter is a third outer hexagonal structure connected to a drilling rig or a drill arm rotating mechanism. A second spline inner tooth is arranged on the hole wall at the other end of the inner hole of the second spline converter. The first outer hexagonal structure at the rear end of the anchor pipe extends into the inner hole of the second spline converter. The second spline inner tooth meshes with the outer hexagonal structure of the nut. The drilling rig or the drill arm rotating mechanism drives the nut to rotate through the second spline converter to apply a preload.

Images