Rock stratum fracture zone reaming device

Abstract

The invention relates to the technical field of rock drilling equipment, and discloses a rock stratum fracture zone reaming device which comprises a fixing support, a lifting seat is arranged on the fixing support, a motor is installed on the lifting seat, a transmission rod is connected to an output shaft of the motor, a reaming drill bit is installed at the bottom end of the transmission rod, and a fixing seat is arranged at the bottom of the fixing support. A rotating block is rotationally mounted on the fixed seat, a pair of stirring rods is mounted on the rotating block and located on the two sides of the transmission rod respectively, the transmission rod is sleeved with a sleeve, the top end of the sleeve is fixedly connected with the lifting seat, a grinding sleeve is fixedly mounted at the bottom end of the sleeve, and a plurality of upper grinding blocks are arranged in the grinding sleeve; a plurality of lower grinding blocks are arranged at the top of the reamer bit, and the lower grinding blocks and the upper grinding blocks are alternately arranged. And the stirring rod continuously stirs the drilling fluid and the stone particles in the hole, so that the flowability of the stone particles is improved, and the stone particles can be discharged out of the hole along with the drilling fluid.

Description

Technical Field

[0001] This invention relates to the field of rock drilling equipment technology, and more specifically, to a hole enlargement device for rock fracture zones. Background Technology

[0002] The rock mass in the fractured rock zone is characterized by loose and broken rock, poor cementation, and low stability. When drilling in the fractured rock zone, small holes are first drilled in the fractured rock zone, and then the holes are enlarged to prevent the hole diameter from being too large at one time, reduce the amount of sand carried by the drilling fluid during the enlargement process, and thus facilitate the removal of stone particles.

[0003] For example, Chinese patent application CN118462054A discloses a hole-expanding device for fractured rock strata, including a tube body, a slider, and two hole-expanding components. The inner wall of the tube body and the outer periphery of the slider body are slidably sealed together. The slider body moves along the central axis of the tube body. The middle position of the top side of the slider body is fixedly connected to the bottom end of the transmission rod. The top end of the transmission rod is fixedly connected to the middle part of the limiting rod. Several openings are formed at equal angles around the central axis of the tube body near the bottom end of the outer periphery of the tube body. The limiting rod is located between the two hole-expanding components, and the two hole-expanding components are set at 180° intervals around the central axis of the tube body. This hole-expanding device for fractured rock strata drills a guide hole in the rock strata and then expands the hole from the bottom of the fractured rock strata upwards. The hole wall after expansion is located below the device, which avoids the hole wall collapse from hindering the hole expansion and reduces the hole-forming cost.

[0004] The aforementioned patented technical solution requires continuous injection of pressurized drilling fluid into the inner cavity of the pipe during borehole enlargement. The drilling fluid contains stone particles and mud that have fallen off from the borehole wall cracks, resulting in poor fluidity of the drilling fluid and making it difficult for the stone particles to be discharged with the drilling fluid. Summary of the Invention

[0005] The purpose of this invention is to provide a hole-expanding device for fractured rock strata to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this solution provides a hole-expanding device for rock fracture zones, including a fixed support, a lifting seat on the fixed support, a motor mounted on the lifting seat, a transmission rod connected to the output shaft of the motor, a hole-expanding drill bit mounted at the bottom end of the transmission rod, a fixed base at the bottom of the fixed support, a rotating block rotatably mounted on the fixed base, and a pair of stirring rods mounted on the rotating block, the pair of stirring rods being located on both sides of the transmission rod; A sleeve is fitted onto the transmission rod, the top end of the sleeve is fixedly connected to the lifting seat, and a grinding sleeve is fixedly installed at the bottom end of the sleeve. Multiple upper grinding blocks are provided inside the grinding sleeve, and multiple lower grinding blocks are provided on the top of the reaming drill bit. The multiple lower grinding blocks are alternately arranged with the multiple upper grinding blocks.

[0007] Preferably, a torsion spring is provided inside the fixed base, one end of the torsion spring is connected to the fixed base, and the other end of the torsion spring is connected to the rotating block; The outer wall of the sleeve is provided with several No. 1 spiral strips, and the inner wall of the rotating block is provided with No. 2 spiral strips. When the No. 1 spiral strips and the No. 2 spiral strips come into contact, the rotating block rotates.

[0008] Preferably, the stirring rod is slidably inserted into the rotating block, the top end of the rotating block abuts against the bottom of the lifting seat, a return spring is sleeved on the stirring rod, and the other end of the return spring is connected to the rotating block. When the reaming drill bit drills, the stirring rod moves down synchronously.

[0009] Preferably, a brush plate is provided at the bottom of the stirring rod, and the bristles of the brush plate are arranged corresponding to the wall of the hole; The stirring rod is equipped with a ball bearing at its top end, and the bottom surface of the lifting seat is circumferentially distributed with several raised strips. When the ball bearing passes over the raised strips, the brush plate vibrates.

[0010] Preferably, the grinding sleeve is provided with a coarse material groove and a fine material groove, and a pair of coarse material grooves are provided, with each pair of coarse material grooves being located adjacent to a pair of stirring rods; Multiple fine material grooves are provided, and each of the multiple fine material grooves is respectively provided with a corresponding guide groove on the reaming drill bit.

[0011] Preferably, the grinding sleeve is further provided with a plurality of auxiliary grinding blocks. The auxiliary grinding blocks, the upper grinding block and the lower grinding block are all hemispherical, and the diameter of the auxiliary grinding blocks is smaller than the diameter of the upper grinding block. The auxiliary grinding blocks are located on the side of the upper grinding block near the coarse material trough.

[0012] Preferably, a scraper is provided at the bottom end of the stirring rod, and the edges of the coarse material trough are rounded. When the stirring rod moves, the scraper pushes the stone particles into the coarse material trough.

[0013] Preferably, a lifting sleeve is slidably installed on the sleeve, and a filter screen is installed at the top of the lifting sleeve, the pore size of the filter screen being smaller than the diameter of the settled stone particles.

[0014] Preferably, a rotating sleeve is rotatably mounted on the grinding sleeve, the rotating sleeve is fixedly connected to the scraper, and a compression spring is provided at the bottom end of the lifting sleeve, with the other end of the compression spring abutting against the bottom surface of the rotating sleeve.

[0015] Preferably, the bottom of the lifting sleeve is provided with a protrusion, and the inner wall of the rotating sleeve is provided with a spiral groove. The protrusion is slidably installed in the spiral groove. When the rotating sleeve rotates, the lifting sleeve moves downward.

[0016] The technical effects and advantages of the present invention are as follows: 1. The rotating block rotates forward and backward continuously, causing the stirring rod installed on the rotating block to continuously agitate the drilling fluid and stone particles in the hole, increasing the fluidity of the stone particles. Among them, the smaller diameter stone particles have strong fluidity and are easily discharged out of the hole with the drilling fluid under the agitation of the stirring rod. However, the larger diameter stone particles have poor fluidity and are easy to deposit. As the reaming drill bit rotates at high speed, the deposited stone particles are rolled into the grinding sleeve. The large diameter stone particles are subjected to double compression from the upper and lower grinding blocks, breaking the large diameter stone particles into smaller diameter stone particles, which are further discharged out of the hole with the drilling fluid.

[0017] 2. As the stirring rod moves downward, it reciprocates with the rotating block, which makes the brush plate have a better cleaning effect on the inclined cracks. Moreover, when the ball passes over the convex strip, the brush plate vibrates, which cleans the stone particles in the cracks, further increasing the removal effect of stone particles from the cracks, thereby improving the quality of the hole wall.

[0018] 3. When the filter screen moves downward, the space in which large-diameter stone particles can move is reduced. Therefore, the filter screen has an aggregation effect on large-diameter stone particles, making it easier for them to enter the grinding sleeve. At the same time, the scraper pushes the large-diameter stone particles into the coarse material trough, allowing the settled large-diameter stone particles to fully enter the coarse material trough for crushing. This prevents a large amount of large-diameter stone particles from accumulating and helps protect the reaming drill bit from being stuck by stone particles. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 Appendix to this invention Figure 1 Enlarged structural diagram at point A; Figure 3 This is an exploded structural diagram of the fixed base and rotating block of the present invention; Figure 4 This is a schematic diagram of the installation structure of the first and second spiral strips of the present invention; Figure 5 This is a schematic diagram of the installation structure of the upper grinding block and the lower grinding block of the present invention; Figure 6 This is a schematic diagram of the structure of the grinding sleeve of the present invention; Figure 7 This is an exploded structural diagram of the rotating sleeve and lifting sleeve of the present invention; Figure 8 Appendix to this invention Figure 7 A magnified structural diagram at point B in the middle.

[0020] Explanation of reference numerals in the attached drawings: 101, fixed bracket; 102, lifting seat; 103, motor; 104, protrusion; 105, transmission rod; 106, reaming drill bit; 107, lower grinding block; 201, stirring rod; 202, return spring; 203, fixed seat; 204, ball bearing; 205, brush plate; 206, scraper; 207, rotating sleeve; 208, rotating block; 209, torsion spring; 210, second spiral strip; 301, grinding sleeve; 302, coarse material trough; 303, sleeve; 304, first spiral strip; 305, filter screen; 306, lifting sleeve; 307, upper grinding block; 308, auxiliary grinding block; 309, compression spring; 310, protrusion; 311, spiral groove; 312, fine material trough. Detailed Implementation

[0021] To make the aforementioned objectives, features, and advantages of this solution more apparent and understandable, the specific embodiments of this solution are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this solution. However, this solution can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this solution. Therefore, this solution is not limited to the specific embodiments disclosed below.

[0022] According to some embodiments of this solution, a hole enlargement device for fractured rock strata is provided, for reference. Figures 1 to 8 As shown, the reaming device for fractured rock formations includes a fixed support 101, on which a lifting seat 102 is mounted. In the prior art, a hydraulic telescopic rod is mounted on the fixed support 101, and the lifting seat 102 is installed at the bottom end of the hydraulic telescopic rod. A motor 103 is mounted on the lifting seat 102, and a transmission rod 105 is connected to the output shaft of the motor 103. A reaming drill bit 106 is mounted at the bottom end of the transmission rod 105. A fixed seat 203 is provided at the bottom of the fixed support 101, and a rotating block 20 is rotatably mounted on the fixed seat 203. 8. A pair of stirring rods 201 are installed on the rotating block 208. The pair of stirring rods 201 are located on both sides of the transmission rod 105. A sleeve 303 is sleeved on the transmission rod 105. The top end of the sleeve 303 is fixedly connected to the lifting seat 102. A grinding sleeve 301 is fixedly installed at the bottom end of the sleeve 303. Multiple upper grinding blocks 307 are provided inside the grinding sleeve 301. Multiple lower grinding blocks 107 are provided on the top of the reaming drill bit 106. The multiple lower grinding blocks 107 are alternately arranged with the multiple upper grinding blocks 307.

[0023] Thus, during borehole reaming, the reaming drill bit 106 grinds the borehole wall, while pressurized drilling fluid is continuously passed through the borehole. The rotating block 208 rotates, causing a pair of stirring rods 201 on the rotating block 208 to move continuously within the borehole. The stirring rods 201 agitate the drilling fluid and stone particles within the borehole, increasing the fluidity of the stone particles and facilitating their discharge out of the borehole with the drilling fluid. Furthermore, the stone particles that detach from the borehole wall cracks include both larger and smaller particles. The smaller particles have higher fluidity and are more easily agitated by the stirring rods 201. Under agitation, the stones are easily discharged from the hole with the drilling fluid. However, larger diameter stones have poor fluidity and are prone to sedimentation, which poses a risk of jamming to the reaming bit 106. Therefore, a grinding sleeve 301 is fixedly installed at the bottom of the casing 303. As the reaming bit 106 rotates at high speed, the deposited stones are rolled into the grinding sleeve 301. The large diameter stones are subjected to double compression by the upper grinding block 307 and the lower grinding block 107, and the large diameter stones are broken into smaller diameter stones, which are then discharged from the hole with the drilling fluid.

[0024] To achieve automatic stirring of the stirring rod 201, please refer to... Figure 3 A torsion spring 209 is installed inside the fixed base 203. One end of the torsion spring 209 is connected to the fixed base 203, and the other end is connected to the rotating block 208. Several first-order spiral strips 304 are provided on the outer wall of the sleeve 303. The first-order spiral strips 304 are evenly distributed at equal intervals. A second-order spiral strip 210 is provided on the inner wall of the rotating block 208. The first-order spiral strips 304 and the second-order spiral strips 210 have the same spiral direction and abut against each other. When the rotating block 208 rotates, the torsion spring 209 twists and stores energy. When the first spiral bar 304 and the second spiral bar 210 lose contact, the rotating block 208 rotates in the opposite direction under the action of the torsion spring 209. Therefore, as several first spiral bars 304 alternately contact the second spiral bar 210 and then lose contact, the rotating block 208 continuously rotates forward and reverse, thereby causing the stirring rod 201 installed on the rotating block 208 to continuously stir the drilling fluid and stone particles in the hole.

[0025] In addition, the stirring rod 201 is slidably inserted into the rotating block 208, the top of the rotating block 208 abuts against the bottom of the lifting seat 102, and a return spring 202 is sleeved on the stirring rod 201. The other end of the return spring 202 is connected to the rotating block 208. When the reaming drill bit 106 drills in, the stirring rod 201 moves down synchronously.

[0026] Furthermore, a brush plate 205 is provided at the bottom of the stirring rod 201, with the bristles of the brush plate 205 corresponding to the hole wall. A ball bearing 204 is provided at the top of the stirring rod 201, and several protrusions 104 are distributed around the bottom surface of the lifting seat 102. When the ball bearing 204 passes over the protrusions 104, the brush plate 205 vibrates.

[0027] It should be noted that the fractured rock zone is characterized by multiple cracks, which often contain small stone particles. The presence of these particles affects the quality of the borehole wall and can cause them to fall off during subsequent use. Therefore, during borehole enlargement, it is necessary to specifically remove the small stone particles present in the cracks of the borehole wall. This device uses a brush plate 205 to clean the borehole wall, causing the stone particles in the cracks to fall off in advance. As the stirring rod 201 moves downward, it rotates back and forth with the rotating block 208, which makes the brush plate 205 have a better cleaning effect on the inclined cracks. Moreover, when the ball bearing 204 passes over the protrusion 104, the brush plate 205 vibrates, and the brush plate 205 vibrates to clean the stone particles in the cracks, further increasing the effect of stone particle removal.

[0028] Please refer to the following: Figure 6 The grinding sleeve 301 is provided with a coarse material groove 302 and a fine material groove 312. There is a pair of coarse material grooves 302, and the pair of coarse material grooves 302 are respectively located adjacent to a pair of stirring rods 201. There are multiple fine material grooves 312, and the multiple fine material grooves 312 are respectively located corresponding to the guide grooves on the reaming drill bit 106. Large-diameter stone particles enter the grinding sleeve 301 through the coarse material grooves 302 for crushing. The fine material grooves 312 are used to smoothly discharge the debris generated by the grinding of the reaming drill bit 106.

[0029] The grinding sleeve 301 is also equipped with multiple auxiliary grinding blocks 308. The auxiliary grinding blocks 308, the upper grinding block 307 and the lower grinding block 107 are all hemispherical. The diameter of the auxiliary grinding block 308 is smaller than that of the upper grinding block 307. The auxiliary grinding block 308 is located on the side of the upper grinding block 307 near the coarse material trough 302, which facilitates the smooth entry of large-diameter stone particles into the grinding sleeve 301. The auxiliary grinding block 308 performs preliminary crushing of the large-diameter stone particles, and the stone particles are further crushed into smaller particles by the upper grinding block 307.

[0030] Through the above technical solution, the reaming device for fractured rock zones provided by this solution, when in use, the reaming drill bit 106 grinds the hole wall, while pressurized drilling fluid is continuously passed through the hole. The reaming drill bit 106 moves downwards with the lifting seat 102 under the action of the hydraulic telescopic rod, and the casing 303 moves downwards synchronously, causing the first spiral strip 304 on the outer wall of the casing 303 to contact the second spiral strip 210 on the inner wall of the rotating block 208. When the first spiral strip 304 and the second spiral strip 210 contact, the rotating block 208 rotates. When the torsion spring 209 twists and stores energy, when the first spiral bar 304 and the second spiral bar 210 lose contact, the rotating block 208 rotates in the opposite direction under the action of the torsion spring 209. Therefore, as several first spiral bars 304 alternately contact the second spiral bar 210 and then lose contact, the rotating block 208 continuously rotates forward and reverses, thereby causing the stirring rod 201 installed on the rotating block 208 to continuously stir the drilling fluid and stone particles in the hole, increasing the fluidity of the stone particles, which is conducive to the stone particles being discharged out of the hole with the drilling fluid. Furthermore, the brush plate 205 installed below the stirring rod 201 cleans the hole wall. As the stirring rod 201 moves downward, it reciprocates with the rotating block 208, resulting in a better cleaning effect of the brush plate 205 on the inclined cracks. Moreover, when the ball bearing 204 passes over the protrusion 104, the brush plate 205 vibrates, vibrating and cleaning the stone particles in the cracks, further increasing the effect of stone particle removal from the cracks. The stone particles that fall off from the cracks in the hole wall include larger particles. The drill bit 106 contains large-diameter and smaller-diameter stone particles. The smaller-diameter stone particles are more fluid and are easily discharged from the hole with the drilling fluid under the agitation of the stirring rod 201. However, the larger-diameter stone particles are less fluid and are more likely to settle. As the reaming drill bit 106 rotates at high speed, the settled stone particles are drawn into the grinding sleeve 301. The large-diameter stone particles are subjected to double compression by the upper grinding block 307 and the lower grinding block 107, and the large-diameter stone particles are broken into smaller-diameter stone particles, which are further discharged from the hole with the drilling fluid.

[0031] It should be noted that the hydraulic telescopic rod consists of an outer cylinder and a multi-stage piston rod assembly. The multi-stage piston rods are nested together, with the diameter decreasing at each stage to achieve a large stroke extension. One end of each stage piston rod is a piston head, which mates with the inner wall of the cylinder to separate the hydraulic oil chamber, while the other end is a guide sleeve to prevent uneven wear of the piston rod and also to assist in sealing. The outer cylinder has an oil inlet and an oil return port, which are respectively connected to the high-pressure pump and oil tank of the hydraulic system. The extension and retraction of the piston rod are achieved by the oil inlet and outlet of the outer cylinder. In addition, the drilling fluid has the functions of carrying cuttings, cooling, lubrication, and wall protection. The drilling fluid is pumped into the borehole by a drilling fluid pump and then pumped out of the borehole by another drilling fluid pump. After being filtered, the extracted drilling fluid is pumped back into the borehole, thus circulating. The specific structure and principle of the hydraulic telescopic rod and drilling fluid circulation are existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0032] For some implementations of this solution, please refer to Figure 5 The bottom end of the stirring rod 201 is equipped with a scraper 206, and the edges of the coarse material trough 302 are rounded. When the stirring rod 201 moves, the scraper 206 pushes the stone particles into the coarse material trough 302.

[0033] Please refer to Figure 5 , Figure 7 A lifting sleeve 306 is slidably installed on the casing 303. A filter screen 305 is installed at the top of the lifting sleeve 306. The filter screen 305 is located above the brush plate 205. The aperture of the filter screen 305 is smaller than the diameter of the large-diameter stones that settle. It should be noted that since pressurized drilling fluid flows inside the borehole, the large-diameter stones deposited in the borehole float up and down with the drilling fluid between the grinding sleeve 301 and the filter screen 305. The settled stones do not easily enter the interior of the grinding sleeve 301. When the lifting sleeve 306 moves the filter screen 305 downward, the space in which the large-diameter stones can move is reduced. Therefore, the filter screen 305 has an aggregation effect on the large-diameter stones, making it easier for the large-diameter stones to enter the grinding sleeve 301.

[0034] Specifically, a rotating sleeve 207 is rotatably mounted on the grinding sleeve 301. The rotating sleeve 207 is fixedly connected to the scraper 206. A compression spring 309 is provided at the bottom end of the lifting sleeve 306. The other end of the compression spring 309 abuts against the bottom surface of the rotating sleeve 207. A protrusion 310 is provided at the bottom of the lifting sleeve 306. A spiral groove 311 is opened on the inner wall of the rotating sleeve 207. The protrusion 310 is slidably installed in the spiral groove 311. When the rotating sleeve 207 rotates, the lifting sleeve 306 moves downward.

[0035] Therefore, when this device is in use, while the stirring rod 201 agitates the drilling fluid, the stirring rod 201 drives the rotating sleeve 207 to rotate via the scraper 206, causing the lifting sleeve 306 to move downward. When the lifting sleeve 306 further drives the filter screen 305 downward, the space where large-diameter stones can move is reduced. Therefore, the filter screen 305 has an aggregation effect on large-diameter stones, making it easier for large-diameter stones to enter the grinding sleeve 301. At the same time, when the stirring rod 201 moves, the scraper 206 pushes the large-diameter stones into the coarse material trough 302, so that the settled large-diameter stones can fully enter the coarse material trough 302 for crushing. The large-diameter stones are subjected to double compression by the upper grinding block 307 and the lower grinding block 107, and the large-diameter stones are crushed into small-diameter stones, which are further discharged out of the hole with the drilling fluid, thereby preventing a large amount of large-diameter stones from accumulating and helping to protect the reaming drill bit 106 from being stuck by stones.

[0036] The preferred embodiments of this solution have been described in detail above with reference to the accompanying drawings. However, this solution is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this solution, various simple modifications can be made to the technical solution, and these simple modifications all fall within the protection scope of this solution.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this solution will not describe the various possible combinations separately.

[0038] Furthermore, various implementations of this solution can be combined in any way, as long as they do not violate the spirit of this solution, they should also be regarded as the content disclosed in this solution.

Claims

1. A hole-reaming device for rock fracture zones, comprising a fixed support (101), a lifting seat (102) provided on the fixed support (101), a motor (103) mounted on the lifting seat (102), a transmission rod (105) connected to the output shaft of the motor (103), and a hole-reaming drill bit (106) mounted at the bottom end of the transmission rod (105), characterized in that: The fixed bracket (101) is provided with a fixed seat (203) at the bottom. A rotating block (208) is rotatably mounted on the fixed seat (203). A pair of stirring rods (201) are mounted on the rotating block (208). The pair of stirring rods (201) are located on both sides of the transmission rod (105). A sleeve (303) is fitted on the transmission rod (105). The top end of the sleeve (303) is fixedly connected to the lifting seat (102). A grinding sleeve (301) is fixedly installed at the bottom end of the sleeve (303). Multiple upper grinding blocks (307) are provided inside the grinding sleeve (301). Multiple lower grinding blocks (107) are provided on the top of the reaming drill bit (106). The multiple lower grinding blocks (107) are alternately arranged with the multiple upper grinding blocks (307).

2. The hole-enlarging device for rock fracture zones according to claim 1, characterized in that: The fixed base (203) is provided with a torsion spring (209), one end of the torsion spring (209) is connected to the fixed base (203), and the other end of the torsion spring (209) is connected to the rotating block (208); The outer wall of the sleeve (303) is provided with a plurality of first spiral strips (304), and the inner wall of the rotating block (208) is provided with second spiral strips (210). When the first spiral strip (304) and the second spiral strip (210) come into contact, the rotating block (208) rotates.

3. The hole-enlarging device for rock fracture zones according to claim 1, characterized in that: The stirring rod (201) is slidably inserted into the rotating block (208), the top of the rotating block (208) abuts against the bottom of the lifting seat (102), a return spring (202) is sleeved on the stirring rod (201), and the other end of the return spring (202) is connected to the rotating block (208). When the reaming drill bit (106) drills in, the stirring rod (201) moves down synchronously.

4. The hole-enlarging device for rock fracture zones according to claim 2, characterized in that: The bottom of the stirring rod (201) is provided with a brush plate (205), and the bristles of the brush plate (205) are arranged corresponding to the hole wall; The stirring rod (201) is provided with a ball bearing (204) at the top end, and the bottom surface of the lifting seat (102) is provided with a number of protrusions (104). When the ball bearing (204) passes over the protrusions (104), the brush plate (205) vibrates.

5. The hole-enlarging device for rock fracture zones according to claim 1, characterized in that: The grinding sleeve (301) is provided with a coarse material groove (302) and a fine material groove (312). A pair of coarse material grooves (302) are provided, and the pair of coarse material grooves (302) are respectively located adjacent to a pair of stirring rods (201). Multiple fine material grooves (312) are provided, and each fine material groove (312) is respectively provided with a guide groove on the reaming drill bit (106).

6. The hole-enlarging device for rock fracture zones according to claim 5, characterized in that: The grinding sleeve (301) is also provided with a plurality of auxiliary grinding blocks (308). The auxiliary grinding blocks (308), the upper grinding block (307) and the lower grinding block (107) are all hemispherical. The diameter of the auxiliary grinding block (308) is smaller than the diameter of the upper grinding block (307). The auxiliary grinding block (308) is located on the side of the upper grinding block (307) near the coarse material trough (302).

7. A hole-enlarging device for rock fracture zones according to claim 6, characterized in that: The bottom end of the stirring rod (201) is provided with a scraper (206), and the edges of the coarse material trough (302) are provided with rounded corners. When the stirring rod (201) moves, the scraper (206) pushes the stone particles into the coarse material trough (302).

8. A hole-enlarging device for rock fracture zones according to claim 7, characterized in that: A lifting sleeve (306) is slidably installed on the sleeve (303), and a filter screen (305) is installed at the top of the lifting sleeve (306). The pore size of the filter screen (305) is smaller than the diameter of the settled stone particles.

9. A hole-enlarging device for rock fracture zones according to claim 8, characterized in that: A rotating sleeve (207) is rotatably mounted on the grinding sleeve (301). The rotating sleeve (207) is fixedly connected to the scraper (206). A compression spring (309) is provided at the bottom end of the lifting sleeve (306). The other end of the compression spring (309) abuts against the bottom surface of the rotating sleeve (207).

10. A hole-enlarging device for rock fracture zones according to claim 9, characterized in that: The lifting sleeve (306) has a protrusion (310) at the bottom and a spiral groove (311) is provided on the inner wall of the rotating sleeve (207). The protrusion (310) is slidably installed in the spiral groove (311). When the rotating sleeve (207) rotates, the lifting sleeve (306) moves down.

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