Grouting device for easy-to-collapse hole section of blast hole under fire rock geological condition

Abstract

The utility model provides a grouting device for an easily-collapsed section of a blast hole under the geological condition of burned rock, which is used for solving the problem in the prior art that the amount of hole protecting slurry which flows into the hole wall of the easily-collapsed section of the blast hole at a single time is difficult to control when the hole protecting slurry is injected from a hole opening of the blast hole. The utility model provides a grouting device for an easily-collapsed hole section of a blast hole under the geological condition of burned rock. The grouting device comprises a drill rod, a drill bit and a grouting unit, the drill bit is used for drilling a blast hole and arranged on the lower end face of the drill rod, the liquid outlet end of a grouting module in the grouting unit is arranged on the lower portion of the blast hole, and a valve in the grouting unit can limit the amount of hole protection slurry injected into the blast hole at a time. The grouting device capable of directly injecting the hole protection slurry into the hole collapse section of the blast hole is obtained, so that the problem that the single injection amount of the hole protection slurry is difficult to control when the hole protection slurry is injected from the hole opening of the blast hole is solved.

Description

Technical Field

[0001] The utility model belongs to the field of grouting devices, in particular to a grouting device for a blasthole section prone to collapse under the geological condition of burned rock. Background Art

[0002] Coal resources are a modern basic energy source. Whether used for self-use or export, they can generate huge economic benefits. However, due to the high requirements for the natural formation of coal mines, the geological characteristics of different coal mines are not the same, and the problems encountered when mining coal mines with different geological characteristics are also different.

[0003] When mining open-pit coal mines with special geological characteristics of igneous rocks, people found that under such geological conditions, spontaneous combustion of coal seams would cause the overlying rock system and surrounding rock of the coal seams to burn and bake, making the rocks with originally plastic deformation characteristics brittle and fragile, with a fragmented structure, and the structures in the form of flakes, plates, fragments, wedges, rhombuses, etc. Moreover, the rock morphology appears as molten rock in the roof closer to the burning coal seam, characterized by the local development of tiny pore structures. Therefore, in the preparation process before blasting the steps in the mining area, the blastholes used to fill the explosives often collapse, resulting in unsatisfactory blasting results.

[0004] At present, scientific researchers have developed many kinds of hole-protecting slurry products with a certain viscosity. This type of hole-protecting slurry product plays a role in protecting the blasthole after being injected into the blasthole.

[0005] The hole protection slurry product has a certain viscosity. If it is injected into the blasthole simultaneously during blasthole drilling, the hole protection slurry will accumulate at the drill bit and seriously affect the drilling efficiency of the drilling rig. Therefore, on-site personnel generally only inject the hole protection slurry into the hole section prone to collapse.

[0006] At present, the grouting method mostly adopts to inject hole protection slurry into the blasthole at the mouth of the blasthole. In the process of the hole protection slurry flowing into the hole collapse section of the blasthole, the hole protection slurry will stay on the normal hole wall of the blasthole due to its certain viscosity, causing the hole protection slurry to be lost, making it difficult to control the specific amount of hole protection slurry flowing into the hole collapse section of the blasthole; if the amount of hole protection slurry poured in at a time is too little, the hole protection effect of the blasthole will be poor, and the blasthole collapse will occur; and if too much hole protection slurry is poured in at a time, the hole protection slurry will accumulate at the drill bit, reducing the drilling efficiency of the drilling rig.

[0007] As described above, currently, when injecting hole protection slurry into the hole section prone to collapse of the blasthole, there are the following problems: it is difficult to control the amount of hole protection slurry that flows into the hole wall of the hole section prone to collapse when injecting hole protection slurry from the blasthole mouth. Utility Model Content

[0008] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide a grouting device for the easily collapsed section of the blasthole under igneous rock geological conditions, which is used to solve the problem in the prior art that it is difficult to control the amount of slurry that flows into the wall of the easily collapsed section of the blasthole when injecting hole-protecting slurry from the hole mouth of the blasthole.

[0009] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a grouting device for a blasthole section prone to collapse under igneous rock geological conditions, the grouting device comprising:

[0010] A drill rod and a drill bit, wherein the drill bit is arranged on the lower end surface of the drill rod;

[0011] A grouting unit, the grouting unit comprising a grouting module and a valve;

[0012] The liquid outlet end of the grouting module injects hole-protecting slurry into the blasthole, and the liquid outlet end of the grouting module is arranged at the bottom of the side wall of the drill pipe;

[0013] The valve controls the opening and closing of the liquid outlet of the grouting module.

[0014] As an optional solution, the grouting module includes a grouting piece and a grouting pipeline;

[0015] The grouting piece is arranged at the bottom of the side wall of the drill pipe, and the liquid outlet end of the grouting piece is connected to the blast hole;

[0016] The liquid outlet end of the grouting pipe is connected to the liquid inlet end of the grouting piece, and the other end of the grouting pipe extends out of the blast hole;

[0017] The valve is arranged on the grouting pipeline.

[0018] As an optional solution, a guide channel is opened in the drill rod;

[0019] One end of the guide channel passes through the upper end surface of the drill rod, and the other end of the guide channel passes through the side wall of the drill rod, and one end of the guide channel passing through the side wall of the drill rod is located at the bottom position of the side wall of the drill rod;

[0020] The grouting pipe is arranged in the guide channel and both ends of the grouting pipe extend out of the guide channel.

[0021] As an optional solution, the grouting pipeline is arranged outside the drill rod;

[0022] The liquid outlet end of the grouting pipe is arranged at the bottom of the side wall of the drill pipe;

[0023] The grouting piece is fixedly installed on the grouting pipeline, and the grouting piece is communicated with the grouting pipeline.

[0024] As an optional solution, when the grouting pipe is fixedly installed on the side wall of the drill rod, the grouting part is also fixedly installed on the drill rod.

[0025] As an optional solution, when the grouting pipe is rotatably mounted on the bottom of the drill rod side wall, the grouting member is also rotatably mounted with the drill rod.

[0026] As an optional solution, the grouting part is a nozzle;

[0027] The nozzle of the nozzle is connected to the wall of the blast hole, and the liquid inlet end of the nozzle is connected to the liquid outlet end of the grouting pipeline.

[0028] As an optional solution, the grouting member includes a liquid inlet channel, an annular groove and a liquid outlet through hole;

[0029] The drill rod is provided with an annular groove and a liquid inlet channel;

[0030] The annular groove is located at the bottom of the drill rod, and a plurality of liquid outlet holes are opened on the outer wall of the annular groove;

[0031] The bottom surface of the annular groove is an inclined bottom surface, and the horizontal height of the bottom surface of the annular groove on the side close to the axis of the drill rod is greater than the horizontal height of the bottom surface of the annular groove on the side away from the axis of the drill rod;

[0032] The liquid outlet through hole penetrates the outer wall of the drill pipe and connects the annular groove with the blast hole wall;

[0033] The lowest point of the wall of the liquid outlet through hole is flush with the lowest point of the bottom surface of the annular groove;

[0034] The lower end surface of the liquid inlet channel is communicated with the annular groove, and the liquid inlet end of the liquid inlet channel passes through the upper end surface of the drill rod;

[0035] The grouting pipe is arranged in the liquid inlet channel, the liquid inlet end of the grouting pipe passes through the upper end surface of the drill rod and extends out of the drill rod, and the lower end surface of the grouting pipe passes through the lower end surface of the liquid inlet channel and is connected with the annular groove.

[0036] As an optional solution, the grouting pipeline is connected with a gas pipeline;

[0037] One end of the air delivery pipe is connected to the grouting pipe, and the other end is connected to an air pump;

[0038] A one-way valve is provided on the gas delivery pipe, and the gas in the gas delivery pipe flows from the air pump to the grouting pipeline;

[0039] The air outlet of the air pump is connected to the air delivery pipe, and the air pump fills the grouting pipeline with gas;

[0040] The valve is arranged between the grouting pipeline connected to the gas transmission pipe and the liquid inlet end of the grouting pipeline.

[0041] As an optional solution, the valve is a flow valve or an on-off valve;

[0042] The valve is arranged on the liquid inlet end of the grouting module, and the valve limits the amount of the hole-protecting slurry injected into the blasthole by the grouting module at a single time.

[0043] As described above, the utility model provides a grouting device for the blasthole section prone to collapse under igneous rock geological conditions, which has at least the following beneficial effects:

[0044] 1. The utility model is capable of controlling the amount of hole-protecting slurry injected into the borehole wall at a single time by providing a grouting unit including a grouting module and a valve. The liquid outlet end of the grouting module is provided at the lower position of the borehole. The liquid outlet end of the grouting module can directly inject the hole-protecting slurry into the wall of the collapsed borehole section of the borehole in the borehole, thereby shortening the time for the hole-protecting slurry to reach the borehole wall and avoiding the slurry loss caused by the hole-protecting slurry flowing in the borehole, thereby solving the problem that it is difficult to control the single injection amount of the hole-protecting slurry when injecting the hole-protecting slurry from the borehole mouth of the blasthole.

[0045] 2. The utility model is provided with a flow valve on the grouting pipeline, and the flow valve can limit the flow rate of the hole-protecting slurry in the liquid inlet section of the grouting module, thereby limiting the amount of hole-protecting slurry in a single blasthole of the grouting module. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Shown is an overall schematic diagram of the utility model;

[0047] Figure 2 It is a cross-sectional view showing the grouting part of the utility model using a nozzle and installing a grouting pipe in a drill rod;

[0048] Figure 3 Shown is a display diagram of the guide channel of the grouting member of the utility model;

[0049] Figure 4 It is a cross-sectional view showing the grouting part of the utility model using a nozzle and installing the grouting pipe outside the drill rod;

[0050] Figure 5 It is a cross-sectional view showing the grouting member of the utility model including an annular groove;

[0051] In the figure: 101. drill rod; 102. drill bit; 103. grouting module; 1031. grouting pipeline;

[0052] 201. nozzle; 202. guide channel;

[0053] 301. annular groove; 302. liquid outlet hole; 303. bottom surface; 304. liquid inlet channel DETAILED DESCRIPTION

[0054] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0055] See also Figures 1 to 5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0056] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0057] See also Figures 1 to 5 The utility model provides a grouting device for a blasthole section prone to collapse under igneous rock geological conditions, the grouting device comprising:

[0058] A drill rod 101 and a drill bit 102, wherein the drill bit 102 is used for blasthole drilling and is disposed on the lower end surface of the drill rod 101;

[0059] A grouting unit, the grouting unit comprising a grouting module 103 and a valve;

[0060] The liquid outlet end of the grouting module 103 injects hole-protecting slurry into the blasthole, and the liquid outlet end of the grouting module 103 is arranged at the bottom of the side wall of the drill pipe 101;

[0061] Since the hole-protecting slurry itself is a non-Newtonian fluid with a certain viscosity, the hole-protecting slurry is easy to block the liquid outlet of the grouting module 103. Therefore, when selecting the liquid outlet of the grouting module 103, it is not advisable to make the liquid outflow channel too small. The liquid outlet of the grouting module 103 with a certain design in structure that can ensure the smooth outflow of the hole-protecting slurry should be appropriately selected;

[0062] The valve controls the opening and closing of the liquid outlet of the grouting module 103;

[0063] The valve can limit the amount of grouting slurry injected into the blasthole by the grouting module 103 at a time by opening and closing;

[0064] When the grouting device is working, the drill bit 102 drills a blasthole, and the drill rod 101 drives the drill bit 102 forward. After the staff identifies the collapsed section of the blasthole, they operate the liquid outlet end of the grouting module 103 at the bottom of the drill rod 101 to inject hole-protecting slurry into the blasthole. The valve at the liquid outlet end of the grouting module 103 limits the amount of hole-protecting slurry injected into the blasthole at one time. The grouting device shortens the time for the hole-protecting slurry to reach the wall of the blasthole, while avoiding the slurry loss caused by the hole-protecting slurry flowing in the blasthole, thereby solving the problem that it is difficult to control the amount of hole-protecting slurry that flows into the wall of the hole section prone to collapse when injecting hole-protecting slurry from the blasthole mouth.

[0065] In this embodiment, please refer to Figures 1 to 5 , the grouting module 103 includes a grouting piece and a grouting pipe;

[0066] The grouting piece is arranged at the bottom of the side wall of the drill pipe 101, and the liquid outlet end of the grouting piece is connected to the blast hole;

[0067] The liquid outlet end of the grouting pipe is connected to the liquid inlet end of the grouting piece, and the other end of the grouting pipe extends out of the blast hole;

[0068] The valve is provided on the grouting pipeline;

[0069] The grouting parts arranged at the bottom of the side wall of the drill pipe 101 can directly inject the hole protection slurry into the hole wall of the blasthole, avoiding the slurry loss caused by the hole protection slurry flowing in the blasthole, thereby solving the problem that it is difficult to control the amount of slurry that flows into the hole wall of the blasthole section prone to collapse when injecting the hole protection slurry from the blasthole mouth.

[0070] In this embodiment, please refer to Figures 1 to 5 , a guide channel 202 is opened in the drill rod;

[0071] One end of the guide channel 202 passes through the upper end surface of the drill rod 101, and the other end of the guide channel 202 passes through the side wall of the drill rod 202. One end of the guide channel 202 passing through the side wall of the drill rod is located at the bottom of the side wall of the drill rod;

[0072] The guide channel 202 is parallel to the axis direction of the drill rod 101;

[0073] The grouting pipe is arranged in the guide channel 202 and both ends of the grouting pipe extend out of the guide channel 202;

[0074] The guide channel 202 is parallel to the axis direction of the drill rod 101;

[0075] When the grouting pipe is arranged inside the drill rod 101, the grouting pipe is fixedly connected to the grouting piece;

[0076] The diameter of the grouting pipeline can satisfy the requirement that the hole-protecting slurry can successfully flow through the grouting pipeline, and the hole-protecting slurry will not be blocked due to its own viscosity.

[0077] In this embodiment, please refer to Figures 1 to 5 , the grouting pipe is arranged outside the drill rod 101;

[0078] The liquid outlet end of the grouting pipe is installed at the bottom of the side wall of the drill rod 101;

[0079] The diameter of the grouting pipe can satisfy the requirement that the hole-protecting slurry can successfully flow through the grouting pipe, and the hole-protecting slurry will not be blocked due to its own viscosity;

[0080] The grouting piece is fixedly installed on the grouting pipeline, and the grouting piece is communicated with the grouting pipeline.

[0081] In this embodiment, please refer to Figures 1 to 5 When the grouting pipe is fixedly installed at the bottom of the side wall of the drill rod 101, the grouting piece is also fixedly installed with the drill rod 101;

[0082] The grouting pipe and the grouting piece are fixedly mounted on the drill rod 101 at the same time, and both the grouting pipe and the grouting piece can rotate along with the drill rod 101;

[0083] When the grouting parts and the grouting pipe are fixedly installed outside the side wall of the drill rod 101, the grouting pipe, the grouting parts and the drill rod 101 can cooperate to inject the hole protection slurry into every direction of the blasthole wall.

[0084] In this embodiment, please refer to Figures 1 to 5 When the grouting pipe is rotatably mounted on the bottom of the side wall of the drill rod 101, the grouting piece is also rotatably mounted with the drill rod 101;

[0085] The grouting pipe is rotatably mounted on the side wall of the drill rod 101, and the grouting member is rotatably mounted on the side wall of the drill rod 101;

[0086] The rotation axis of the grouting pipe and the grouting piece coincides with the axis of the drill rod 101, the rotation of the grouting pipe and the grouting piece keeps synchronous rotation, and the liquid outlet end of the grouting pipe and the liquid inlet end of the grouting piece are fixedly connected;

[0087] When the grouting parts and the grouting pipes are rotatably installed outside the side walls of the drill pipe 101, the direction in which the hole-protecting slurry is injected into the borehole wall can be controlled by controlling the rotation rate difference between the grouting parts, the grouting pipes and the drill pipe 101, thereby achieving the goal of injecting the hole-protecting slurry into the borehole wall only in a certain direction.

[0088] In this embodiment, please refer to Figures 1 to 5 , the grouting part is a nozzle 201;

[0089] The nozzle of the nozzle 201 is connected to the wall of the blasthole, and the liquid inlet end of the nozzle 201 is connected to the liquid outlet end of the grouting pipeline;

[0090] Since the hole-protecting slurry of the nozzle 201 itself has a certain viscosity, the aperture of the liquid outlet end of the nozzle 201 should be sufficient to allow the hole-protecting slurry to be sprayed onto the blasthole wall without being easily blocked;

[0091] It is recommended to clean the nozzle 201 with clean water after using it for a period of time.

[0092] In this embodiment, please refer to Figures 1 to 5 The grouting part includes a liquid inlet channel 304, an annular groove 301 and a liquid outlet through hole 302;

[0093] The drill rod 101 is provided with an annular groove 301 and a liquid inlet channel 304;

[0094] The annular groove 301 is located at the bottom of the drill rod 101, and a plurality of liquid outlet holes 302 are opened on the outer wall of the annular groove 301;

[0095] The bottom surface 303 of the annular groove is an inclined bottom surface, and the horizontal height of the bottom surface 303 of the annular groove close to the axis of the drill rod is greater than the horizontal height of the bottom surface 303 of the annular groove away from the axis of the drill rod;

[0096] The liquid outlet through hole 302 penetrates the outer wall of the drill rod 101 and connects the annular groove 301 with the wall of the blast hole;

[0097] The liquid outlet through holes 302 are arranged in a circular array on the side wall of the drill rod 101 around the axis of the drill rod 101;

[0098] The lowest point of the wall of the liquid outlet through hole 302 is flush with the lowest point of the bottom surface 303 of the annular groove;

[0099] The lower end surface of the liquid inlet channel 304 is communicated with the annular groove 301, and the liquid inlet end of the liquid inlet channel 304 passes through the upper end surface of the drill rod 101;

[0100] The grouting pipe is arranged in the liquid inlet channel 304, the liquid inlet end of the grouting pipe passes through the upper end surface of the drill rod 101 and extends out of the drill rod 101, and the lower end surface of the grouting pipe passes through the lower end surface of the liquid inlet channel 304 and communicates with the annular groove 301;

[0101] The hole-protecting slurry enters the annular groove 301 from the liquid inlet channel 304, and the liquid outlet hole 302 opened on the annular groove 301 is used for the hole-protecting slurry in the annular groove 301 to flow out. The hole-protecting slurry in the annular groove 301 is injected into the borehole wall through the liquid outlet hole 302. The inclined bottom surface 303 of the annular groove 301 can ensure that the hole-protecting slurry in the annular groove 301 can always flow into the borehole through the liquid outlet hole 302 to avoid the hole-protecting slurry viscosity blocking the liquid outlet hole 302.

[0102] In this embodiment, please refer to Figures 1 to 5 , the grouting pipeline is connected with a gas pipeline;

[0103] One end of the air delivery pipe is connected to the grouting pipe, and the other end is connected to an air pump;

[0104] A one-way valve is provided on the gas delivery pipe, and the gas in the gas delivery pipe flows from the air pump to the grouting pipeline;

[0105] The air outlet of the air pump is connected to the air delivery pipe, and the air pump fills the grouting pipeline with gas;

[0106] The valve is arranged between the grouting pipeline communicating with the gas delivery pipe and the liquid inlet end of the grouting pipeline;

[0107] After the valve is closed, the air pump starts to fill the grouting pipe with gas;

[0108] The air pump can clean the residual hole-protecting slurry in the grouting pipe and the grouting parts by filling the grouting pipe with gas, so as to prevent the hole-protecting slurry from solidifying inside and affecting the next use.

[0109] In this embodiment, please refer to Figures 1 to 5 , the valve is a flow valve or an on-off valve;

[0110] The valve is arranged on the liquid inlet end of the grouting module 103, and the valve limits the amount of the hole-protecting slurry injected into the blasthole by the grouting module 103 at a time;

[0111] The hole protection slurry is stored in a liquid storage tank, and the liquid outlet of the liquid storage tank is connected to the liquid inlet of the grouting module;

[0112] When the valve is used as an on-off valve, the valve controls the amount of the hole-protecting slurry injected into the blasthole at a single time by personnel or by setting the opening and closing timing;

[0113] When the valve is used as a flow valve, the valve can directly detect the amount of the borehole-protecting slurry injected into the blasthole per unit time and directly control the amount of the borehole-protecting slurry injected into the blasthole.

[0114] In summary, according to the utility model, when it is necessary to use a grouting device for a blasthole section prone to collapse under igneous rock geological conditions, when it is necessary to grout into the blasthole, the grouting device uses the grouting module 103 of the grouting unit to directly inject the hole protection slurry into the hole wall at the bottom end of the side wall of the drill pipe 101 at the liquid outlet end, and the valve in the grouting unit limits the amount of the hole protection slurry injected into the blasthole at a single time, so that the hole protection slurry can directly reach the hole wall of the blasthole, shortening the time for the hole protection slurry to reach the hole wall of the blasthole and avoiding the slurry loss caused by the hole protection slurry flowing in the blasthole, thereby solving the problem that it is difficult to control the single injection amount of the hole protection slurry when injecting the hole protection slurry from the blasthole mouth of the blasthole.

[0115] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A grouting device for the blasthole section prone to collapse under igneous rock geological conditions, characterized in that: The grouting device comprises: A drill rod and a drill bit, wherein the drill bit is arranged on the lower end surface of the drill rod; A grouting unit, the grouting unit comprising a grouting module and a valve; The liquid outlet end of the grouting module injects hole-protecting slurry into the blasthole, and the liquid outlet end of the grouting module is arranged at the bottom of the side wall of the drill pipe; The valve controls the opening and closing of the liquid outlet of the grouting module.

2. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 1 is characterized by: The grouting module comprises a grouting piece and a grouting pipeline; The grouting piece is arranged at the bottom of the side wall of the drill pipe, and the liquid outlet end of the grouting piece is connected to the blast hole; The liquid outlet end of the grouting pipe is connected to the liquid inlet end of the grouting piece, and the other end of the grouting pipe extends out of the blast hole; The valve is arranged on the grouting pipeline.

3. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 2 is characterized by: A guide channel is provided in the drill rod; One end of the guide channel passes through the upper end surface of the drill rod, and the other end of the guide channel passes through the side wall of the drill rod, and one end of the guide channel passing through the side wall of the drill rod is located at the bottom position of the side wall of the drill rod; The grouting pipe is arranged in the guide channel and both ends of the grouting pipe extend out of the guide channel.

4. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 2 is characterized by: The grouting pipeline is arranged outside the drill rod; The liquid outlet end of the grouting pipe is arranged at the bottom of the side wall of the drill pipe; The grouting piece is fixedly installed on the grouting pipeline, and the grouting piece is communicated with the grouting pipeline.

5. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 4 is characterized by: When the grouting pipe is fixedly installed on the side wall of the drill rod, the grouting piece is also fixedly installed on the drill rod.

6. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 4, characterized in that: When the grouting pipe is rotatably mounted on the bottom of the drill rod side wall, the grouting piece is also rotatably mounted with the drill rod.

7. A grouting device for a blasthole section prone to collapse under igneous rock geological conditions according to claim 3 or claim 4, characterized in that: The grouting part is a nozzle; The nozzle of the nozzle is connected to the wall of the blast hole, and the liquid inlet end of the nozzle is connected to the liquid outlet end of the grouting pipeline.

8. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 2 is characterized by: The grouting part comprises a liquid inlet channel, an annular groove and a liquid outlet through hole; The drill rod is provided with an annular groove and a liquid inlet channel; The annular groove is located at the bottom of the drill rod, and a plurality of liquid outlet holes are opened on the outer wall of the annular groove; The bottom surface of the annular groove is an inclined bottom surface, and the horizontal height of the bottom surface of the annular groove on the side close to the axis of the drill rod is greater than the horizontal height of the bottom surface of the annular groove on the side away from the axis of the drill rod; The liquid outlet through hole penetrates the outer wall of the drill pipe and connects the annular groove with the blast hole wall; The lowest point of the wall of the liquid outlet through hole is flush with the lowest point of the bottom surface of the annular groove; The lower end surface of the liquid inlet channel is communicated with the annular groove, and the liquid inlet end of the liquid inlet channel passes through the upper end surface of the drill rod; The grouting pipe is arranged in the liquid inlet channel, the liquid inlet end of the grouting pipe passes through the upper end surface of the drill rod and extends out of the drill rod, and the lower end surface of the grouting pipe passes through the lower end surface of the liquid inlet channel and is connected with the annular groove.

9. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 2, characterized in that: The grouting pipeline is connected with a gas pipeline; One end of the air delivery pipe is connected to the grouting pipe, and the other end is connected to an air pump; A one-way valve is provided on the gas delivery pipe, and the gas in the gas delivery pipe flows from the air pump to the grouting pipeline; The air outlet of the air pump is connected to the air delivery pipe, and the air pump fills the grouting pipeline with gas; The valve is arranged between the grouting pipeline connected to the gas transmission pipe and the liquid inlet end of the grouting pipeline.

10. The grouting device for the blasthole section prone to collapse under igneous rock geological conditions according to claim 1, characterized in that: The valve is a flow valve or an on-off valve; The valve is arranged on the liquid inlet end of the grouting module, and the valve limits the amount of the hole-protecting slurry injected into the blasthole by the grouting module at a single time.

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