Iron ore mining drilling device

Abstract

The invention relates to an iron ore mining drilling device, which belongs to the technical field of mining devices, and comprises a driving unit capable of driving a drilling assembly to rotate through a transmission case so as to complete drilling. The drilling assembly comprises a drilling rod main body, and an adjusting assembly and a plurality of groups of reaming assemblies are arranged on the drilling rod main body; and a plurality of groups of drilling tools are arranged on the expanding drilling assembly. A core rod is arranged in the drill rod body, and the adjusting assembly can drive the cutting part of the drilling tool to expand or contract in the radial direction of the drill rod body through the core rod. The adjusting assembly can drive the cutting parts of the drilling tools of the different groups of expanding drilling assemblies to sequentially move in the axial direction of the drill rod body through the core rod. The reaming assembly is adjusted, and online and graded hole diameter adjustment of a single drilling tool in the drilling process can be achieved. An operator does not need to replace the drill bit and can control stretching and retracting of the drilling tool only by driving the core rod through the adjusting assembly, so that the diameter of a drill hole is changed, frequent replacement of drill bits of different models is avoided, operation continuity is guaranteed, and construction efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to an iron ore mining drilling device, belonging to the technical field of mining equipment. Background Technology

[0002] During iron ore mining, to ensure safety, roadways require simultaneous support, typically using bolt support. During construction, manual drilling with a pneumatic drill is used to create anchor holes (grouting holes) in the rock mass. Then, grouting is used to install the anchor bolts to reinforce the rock mass and prevent collapse.

[0003] Generally, different geological conditions require different borehole diameters. In soft soil strata, where rock mass stability is low, smaller borehole diameters are needed to prevent borehole wall collapse; while in hard rock strata, larger borehole diameters can be used to meet the needs of deep-hole grouting and other processes, ensuring sufficient injection and diffusion of grout.

[0004] In addition, the properties of the grouting material directly affect the choice of orifice size. Grouts with coarser particles and higher consistency require larger orifice sizes to ensure smooth grouting; while chemical grouts with good fluidity can be used to complete grouting in smaller orifice sizes.

[0005] Current drilling methods have several shortcomings: In conventional operations, workers need to prepare multiple types of drill bits to handle anchor hole construction of different sizes. When drilling anchor holes of different diameters, frequent changes of the corresponding drill bit are required, a time-consuming and labor-intensive process that interrupts work continuity and leads to low drilling efficiency. Furthermore, most current rock drilling equipment cannot flexibly adjust the output borehole diameter, still requiring multiple drill bits during construction. This not only increases equipment costs but also creates inconvenience for on-site operation and material management. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an iron ore mining drilling device that uses a single drilling component that can flexibly adjust the output borehole diameter, and can drill anchor holes of various diameters through a single drilling component.

[0007] The present invention provides an iron ore mining drilling device, comprising: a drive unit, a transmission box, and a drilling assembly.

[0008] The drive unit can rotate the drilling assembly via the transmission box to complete the drilling.

[0009] The drilling assembly includes a drill pipe body, on which an adjustment assembly and several sets of reaming assemblies are provided; the reaming assemblies are provided with several sets of drill bits.

[0010] The drill pipe body has a core rod inside. The adjustment assembly can drive the cutting part of the drill bit to expand or contract radially along the drill pipe body through the core rod. The adjustment assembly can also drive the cutting parts of the drill bits of different sets of reaming assemblies to move sequentially along the axial direction of the drill pipe body through the core rod.

[0011] Furthermore, the drill pipe body includes an outer drill sleeve, inside which a drill cylinder is fitted, and a core rod can be fitted inside the drill cylinder.

[0012] The front and rear ends of the drill barrel are respectively equipped with a drill bit and a plugging block. The outer drill sleeve can be clamped between the drill bit and the plugging block to achieve axial positioning of the outer drill sleeve and the drill barrel.

[0013] The inner wall of the outer drill sleeve is provided with several slots, the main body of the outer drill sleeve is provided with an axially penetrating drainage channel, the outer drill sleeve is provided with a first insertion hole and several sets of drill bit slots, and the outer wall of the outer drill sleeve is provided with several drainage grooves. The drill barrel is equipped with a drill bit holder and a guide block, and a second insertion hole is also provided through the drill barrel.

[0014] The first insertion hole and the second insertion hole are set to coincide; the drill bit holder and the guide block can be inserted into the slot.

[0015] Furthermore, the adjustment assembly includes: an adjustment seat that can be set into the first insertion hole and the second insertion hole, a center rod rotatably connected to the adjustment seat, an active adjustment gear on the center rod, and a driven adjustment gear that can mesh with the active adjustment gear on the core rod.

[0016] Furthermore, the reaming assembly includes: a drill bit disposed on the drill bit holder, and a push block that can be inserted into the drill barrel and connected to the mandrel; a bushing is provided in the drill bit slot, through which the drill bit can protrude from the surface of the outer drill sleeve; and an elastic element for drill bit reset is provided at the bottom of the drill bit holder.

[0017] Furthermore, the outer wall of the push block is uniformly provided with several push grooves extending along its axial direction; The push groove includes a guide groove and a limiting groove located in the same groove opening, and a connecting part is provided between the guide groove and the limiting groove.

[0018] The drill bit body has a cutting head and a cutting tail at both ends, and a protrusion on the side of the drill bit body; the protrusion can be contained in the push groove and can abut against the bottom of the guide groove; the cutting tail can abut against the elastic element and the bushing.

[0019] The inner side of the bushing is equipped with a sealing plate, and one side of the cutting head can abut against the sealing plate.

[0020] Furthermore, the drill bit has a drainage ring groove on its back, and a coolant hole is provided through the drill bit, which is connected to the drainage ring groove; the outlet of the drainage channel can be connected to the drainage ring groove.

[0021] The back of the drill bit also features a protruding support seat, and one end of the core rod can be rotatably connected to the support seat.

[0022] Furthermore, the sealing block is provided with an adapter hole, into which an elastic support is inserted; one end of the core rod can be rotatably inserted into the adapter hole, and the elastic support can provide axial preload for the core rod.

[0023] Furthermore, the tail of the outer drill sleeve is equipped with a manifold, and the inlet of the manifold is connected to a rotary joint that can communicate with the external coolant. The coolant can be introduced into the drainage channel through the rotary joint.

[0024] Furthermore, the transmission box includes: a housing and an end cap that mates with it; an outer drill sleeve is rotatably connected to the housing and the end cap.

[0025] The transmission box is equipped with a transmission shaft that can be driven by the drive unit. The transmission shaft is equipped with a drive gear, and the tail of the outer drill sleeve is equipped with a driven gear that can mesh with the drive gear. The transmission shaft can drive the outer drill sleeve to rotate through gear engagement.

[0026] The beneficial effects of this invention compared to the prior art are: This invention, through the installation of an adjustable reaming assembly, enables online, staged adjustment of the borehole diameter using a single drill bit during the drilling process. Operators do not need to change drill bits; they only need to adjust the drive mandrel of the assembly to control the extension and retraction of the drill bit, thereby changing the borehole diameter. This avoids frequent changes to different drill bit models, ensuring operational continuity and significantly improving construction efficiency. One set of drill bits can meet the construction requirements of different borehole diameters, eliminating the need for construction units to purchase, store, transport, and manage multiple specifications of drill bits, thus improving management efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an iron ore mining drilling device according to the present invention; Figure 2 This is a schematic diagram of the transmission box structure of an iron ore mining drilling device according to the present invention; Figure 3 A cross-sectional structural schematic diagram of an iron ore mining drilling device according to the present invention; Figure 4 yes Figure 3 A magnified schematic diagram of the partial structure at point A in the middle; Figure 5 yes Figure 3 A magnified schematic diagram of the local structure at point B; Figure 6 This is a first partial cross-sectional view of a drilling device for iron ore mining according to the present invention. Figure 7 This is a second partial cross-sectional view of the drilling device for iron ore mining according to the present invention. Figure 8 This is a schematic diagram of the push block structure of an iron ore mining drilling device according to the present invention; Figure 9 This is a schematic diagram of the drill bit structure of an iron ore mining drilling device according to the present invention; Figure 10 This is a schematic diagram of the outer drill sleeve structure of an iron ore mining drilling device according to the present invention; Figure 11 This is a schematic diagram of the drill barrel structure of an iron ore mining drilling device according to the present invention; Figure 12 This is a schematic diagram of the radial structure of the drill bit protruding from the iron ore mining drilling device of the present invention; Figure 13 This is a cross-sectional structural diagram of the drill bit retracted state of an iron ore mining drilling device according to the present invention.

[0028] In the picture: 1. Drive unit; 2. Transmission box; 201. Housing; 202. End cover; 203. Drive gear; 204. Drive shaft; 205. Driven gear; 3. Drilling assembly; 301, outer drill sleeve; 3011, slot; 3012, drainage channel; 3013, first insertion hole; 3014, drainage groove; 3015, drill bit groove; 302. Drill barrel; 3021. Drill bit holder; 3022. Guide block; 3023. Second insertion hole; 303, core rod; 304. Adjustment assembly; 3041. Adjustment seat; 3042. Center rod; 3043. Active adjusting gear; 3044. Driven adjusting gear; 305. Elastic support components; 306, sealing block; 3061, adapter hole; 307. Manifold; 308. Push block; 3081. Guide groove; 3082. Connecting part; 3083. Limiting groove; 309. Bushing; 3091. Sealing plate; 310. Elastic components; 311. Drill bit; 3111. Protrusion; 3112. Cutting head; 3113. Cutting tread; 312. Drill bit; 3121. Drainage annular groove; 3122. Coolant hole; 3123. Support base; 4. Rotary joint. Detailed Implementation

[0029] like Figures 1-13As shown, this embodiment is achieved through the following technical solution: drive unit 1, transmission box 2, and drilling assembly 3.

[0030] The drive unit 1 can drive the drilling assembly 3 to rotate through the transmission box 2 to complete the drilling.

[0031] The drilling assembly 3 includes a drill pipe body, on which an adjustment assembly 304 and several sets of reaming assemblies are provided; the reaming assemblies are provided with several sets of drill cutters 311.

[0032] The drill pipe body has a core rod 303 inside. The adjustment component 304 can drive the cutting part of the drill bit 311 to expand or contract radially along the drill pipe body through the core rod 303. The adjustment component 304 can also drive the cutting parts of the drill bit 311 of different sets of drilling reaming components to move sequentially along the axial direction of the drill pipe body through the core rod 303.

[0033] In this embodiment, the number of reaming assemblies is 3 sets, with different sets of reaming assemblies distributed along the axial direction of the drill pipe body. Each set of reaming assemblies includes 4 drill bits 311; for example... Figure 6 As shown. The drill bits 311 of adjacent reaming assemblies are staggered along the circumference of the drill pipe assembly, as follows. Figure 12 As shown.

[0034] Specifically, the drill pipe body includes an outer drill sleeve 301, a drill cylinder 302 is fitted inside the outer drill sleeve 301, and a core rod 303 can be fitted inside the drill cylinder 302.

[0035] The front and rear ends of the drill barrel 302 are respectively provided with a drill bit 312 and a plugging block 306. The outer drill sleeve 301 can be clamped between the drill bit 312 and the plugging block 306 to achieve axial positioning of the outer drill sleeve 301 and the drill barrel 302.

[0036] The inner wall of the outer drill sleeve 301 is provided with several slots 3011, the main body of the outer drill sleeve 301 is provided with an axially penetrating drainage channel 3012, the outer drill sleeve 301 is provided with a first insertion hole 3013 and several sets of drill bit slots 3015, and the outer wall of the outer drill sleeve 301 is provided with several drainage grooves 3014.

[0037] In this embodiment, the diversion groove 3014 is spirally arranged along the axial direction of the outer drill sleeve 301.

[0038] The drill barrel 302 is provided with a drill bit holder 3021 and a guide block 3022, and a second insertion hole 3023 is also provided through the drill barrel 302.

[0039] The first insertion hole 3013 and the second insertion hole 3023 are arranged to overlap; the drill bit holder 3021 and the guide block 3022 can be inserted into the slot 3011.

[0040] Specifically, the adjustment assembly 304 includes: an adjustment seat 3041 that can be set into the first insertion hole 3013 and the second insertion hole 3023, a center rod 3042 rotatably connected to the adjustment seat 3041, an active adjustment gear 3043 provided on the center rod 3042, and a driven adjustment gear 3044 that can mesh with the active adjustment gear 3043 sleeved on the core rod 303.

[0041] Specifically, the reaming assembly includes: a drill bit 311 mounted on the drill bit holder 3021, and a pusher block 308 that can be inserted into the drill barrel 302 and connected to the core rod 303; a bushing 309 is provided in the drill bit slot 3015, through which the drill bit 311 can pass and protrude from the surface of the outer drill sleeve 301; and an elastic element 310 for resetting the drill bit 311 is provided at the bottom of the drill bit holder 3021.

[0042] In this embodiment, the core rod 303 has partial threads, and the core rod 303 and the push block 308 are threadedly engaged. When the core rod 303 rotates inside the drill barrel 302, it can drive the push block 308 to move axially along the inner wall of the drill barrel 302, such as... Figure 6 As shown.

[0043] Specifically, the outer circumferential wall of the push block 308 is uniformly provided with several push grooves extending along its axial direction.

[0044] The push groove includes a guide groove 3081 and a limiting groove 3083 located in the same groove opening, and a connecting part 3082 is provided between the guide groove 3081 and the limiting groove 3083.

[0045] In this embodiment, the pushing groove is stepped. Preferably, the guide groove 3081 is larger than the radial depth of the limiting groove 3083, and the connecting part 3082 is a smooth inclined surface to achieve a continuous and smooth transition of the bottom of the pushing groove. Figure 8 As shown.

[0046] In this embodiment, preferably, there are 12 pushing grooves, arranged in groups of 3, for a total of 4 groups. Within each group, the length ratio of the guide groove 3081 to the limiting groove 3083 increases sequentially. The four groups of pushing grooves are evenly distributed along the outer surface of the pushing block 308. Specifically, the adaptation relationship between the pushing groove and the drill bit 311 is set based on the aforementioned length ratio: the pushing groove with the smallest length ratio is adapted to the drill bit 311 closest to the drill bit 312; while the pushing groove with the largest length ratio is adapted to the drill bit 311 farthest from the drill bit 312. The distance between the drill bit 311 adapted to each pushing groove and the drill bit 312 increases accordingly with the increase of the pushing groove length ratio.

[0047] The drill bit 311 has a cutting head 3112 and a cutting tail 3113 at both ends of its main body. The drill bit 311 has a protrusion 3111 on its side. The protrusion 3111 can be contained in the push groove and can abut against the bottom of the guide groove 3081. The cutting tail 3113 can abut against the elastic member 310 and the bushing 309.

[0048] Specifically, the pusher block 308 moves axially to drive multiple sets of drill bits 311 in stages and sequentially.

[0049] In this embodiment, the side of the protrusion 3111 can abut against the side of the push groove. When the push block 308 moves in the drill barrel 302, the protrusion 3111 can slide in the push groove. The two work together to achieve circumferential positioning of the push block in the drill barrel 302. Preferably, the depth of the guide groove 3081 is greater than the distance by which the protrusion 3111 protrudes from the inner wall of the drill barrel 302, and the protrusion 3111 does not contact the bottom of the guide groove 3081. The depth of the limiting groove 3083 is less than the distance by which the protrusion 3111 protrudes from the inner wall of the drill barrel 302, and the protrusion 3111 can abut against the bottom of the limiting groove 3083. At this time, the drill bit 311 is lifted up, causing the cutting head 3112 to protrude from the surface of the outer drill sleeve 301, thereby expanding the drilling diameter.

[0050] In this embodiment, the push block 308 is provided with push grooves of different length ratios. Simultaneously, the protrusions 3111 of the drill bits 311 in different groups of reaming assemblies have different dimensions. Preferably, from the drill bit 312 side, the protrusion distance of the drill bit protrusions 3111 towards the inner wall of the drill barrel 302 increases sequentially from near to far. Accordingly, the push grooves of different length ratios, in conjunction with the protrusions 3111 of different dimensions, allow multiple groups of drill bits 311 to extend sequentially and progressively along the axial direction of the drill rod assembly, and the drilling diameter can increase sequentially. Figure 12 As shown. This "step-by-step" reaming method distributes the huge cutting force of a single reaming operation across multiple levels, avoiding the potential for a surge in torque, equipment overload, or severe vibration that could result from an excessively large reaming volume in a single operation. This makes the entire reaming process more stable and controllable, reducing the risk of stuck drill bits and broken rods. Especially in hard rock formations, it can effectively improve drilling stability and success rate.

[0051] The inner side of the bushing 309 is provided with a sealing plate 3091, and one side of the cutting head 3112 can abut against the sealing plate 3091.

[0052] When the drill bit 311 extends out of the bushing 309, the sealing plate 3091 can elastically contact the drill bit 311, blocking the gap between the drill bit 311 and the bushing 309, preventing drill cuttings and other particles from entering the interior of the drill rod body along this gap during drilling. Figure 5 As shown.

[0053] Specifically, the back of the drill bit 312 is provided with a flow-guiding ring groove 3121, and a coolant hole 3122 is provided through the drill bit 312. The coolant hole 3122 is connected to the flow-guiding ring groove 3121. The outlet of the flow-guiding channel 3012 can be connected to the flow-guiding ring groove 3121.

[0054] The back of the drill bit 312 also features a protruding support seat 3123, and one end of the core rod 303 is rotatably connected to the support seat 3123, such as... Figure 5 , Figure 6 As shown.

[0055] Specifically, the sealing block 306 is provided with a transition hole 3061, and an elastic support 305 is inserted into the transition hole 3061; one end of the core rod 303 can be rotatably inserted into the transition hole 3061, and the elastic support 305 can provide axial preload for the core rod 303.

[0056] Specifically, the tail of the outer drill sleeve 301 is provided with a manifold 307, and the inlet of the manifold 307 is connected to a rotary joint 4 that can communicate with the external coolant. The coolant can be introduced into the diversion channel 3012 through the rotary joint 4.

[0057] During drilling, the manifold 307 rotates along with the drill pipe body, and the rotating part of the rotary joint 4 also rotates accordingly. The fixed part of the rotary joint 4 is connected to the external coolant pipeline, continuously supplying coolant to the drill pipe body. A chamber is formed between the manifold 307 and the end face of the outer drill sleeve 301. Coolant enters this chamber and is transported to the working surface of the drill bit 312 through the manifold 307, the drainage channel 3012, and the coolant hole 3122.

[0058] Specifically, the transmission box 2 includes: a housing 201 and an end cover 202 that is connected thereto; the outer drill sleeve 301 is rotatably connected to the housing 201 and the end cover 202.

[0059] The transmission box 2 is equipped with a transmission shaft 204 that can be driven by the drive unit 1. The transmission shaft 204 is equipped with a drive gear 203, and the tail of the outer drill sleeve 301 is equipped with a driven gear 205 that can mesh with the drive gear 203. The transmission shaft 204 can drive the outer drill sleeve 301 to rotate through gear engagement.

[0060] In this embodiment, the drive unit 1 is an electric drill, and the output shaft of the drill is coaxially connected to the transmission shaft 204.

[0061] The specific operating principle of this invention is as follows: During drilling, drive unit 1 starts, driving the entire drill rod body to rotate at high speed via drive gear 203 and driven gear 205 in transmission box 2. Drill bit 312 at the front end of drill rod body first contacts the rock wall to perform conventional hole drilling.

[0062] When a larger diameter borehole is required, the existing conventional borehole needs to be enlarged. The operator drives the adjustment assembly 304. The adjustment assembly 304 drives the mandrel 303 to rotate within the drill barrel 302 via its internal active adjustment gear 3043 and driven adjustment gear 3044. Since the mandrel 303 and the push block 308 are threadedly engaged, the rotational motion of the mandrel is converted into linear movement of the push block 308 along the axial direction of the drill barrel 302.

[0063] The outer wall of the push block 308 is provided with several push grooves, and the protrusion 3111 on each drill bit 311 corresponds to one push groove. The push groove consists of a deeper guide groove 3081 and a shallower limiting groove 3083. In the initial state, the protrusion 3111 of the drill bit 311 is located within the guide groove 3081. At this time, the drill bit 311 is in a retracted state under the action of the elastic element 310, and the cutting head 3112 does not extend out of the drill rod body. Figure 13 As shown.

[0064] When the push block 308 moves axially, the protrusion 3111 of the drill bit slides along the push groove and enters the limiting groove 3083 from the guide groove 3081 via the connecting part 3082. Since the depth of the limiting groove is less than the height of the protrusion 3111, the protrusion 3111 is radially lifted by the bottom of the groove, forcing the drill bit 311 to tilt up with its hinge point as the fulcrum, and its cutting head 3112 extends out of the surface of the outer drill sleeve 301 to begin the hole reaming operation.

[0065] By designing push grooves with different length ratios for drill bit sets at different axial positions, it is possible to achieve the following as the push block 308 continues to move: the drill bit set closest to the drill bit 312 will be ejected first for the first stage of hole enlargement, and then other drill bit sets will be ejected sequentially along the axial direction, thereby achieving the gradual and sequential enlargement of the hole diameter.

[0066] After the hole is enlarged, the reverse drive adjustment component 304 causes the core rod 303 to rotate in the opposite direction, and the push block 308 moves axially in the opposite direction. The protrusion 3111 of the drill bit 311 retracts from the limiting groove into the guide groove, and under the restoring force of the elastic element 310, the drill bit 311 retracts into the drill rod body.

[0067] Throughout the drilling and reaming process, external coolant enters the drainage channel 3012 on the outer drill sleeve 301 through the rotary joint 4 and the manifold 307, flows to the drainage ring groove 3121 on the back of the drill bit 312, and is finally delivered to the cutting working surface of the drill bit and drill cutter through the coolant hole 3122 on the drill bit, achieving continuous and efficient cooling and lubrication, ensuring machining quality and extending tool life. The finished coolant and drill chips can be discharged from the borehole along the drainage groove 3014.

[0068] Of course, the above description is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the embodiments of the present invention. The present invention is also not limited to the above examples, and all equivalent changes and improvements made by those skilled in the art within the scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. A drilling device for iron ore mining, characterized in that, include: Drive unit (1), transmission box (2) and drilling assembly (3); The drive unit (1) can drive the drilling assembly (3) to rotate through the transmission box (2) to complete the drilling; The drilling assembly (3) includes a drill pipe body, on which an adjustment assembly (304) and several sets of reaming assemblies are provided; the reaming assemblies are provided with several sets of drill bits (311). The drill pipe body is equipped with a core rod (303). The adjustment component (304) can drive the cutting part of the drill bit (311) to expand or contract radially along the drill pipe body through the core rod (303). The adjustment component (304) can also drive the cutting parts of the drill bits (311) of different sets of drilling reaming components to move sequentially along the axial direction of the drill pipe body through the core rod (303).

2. The iron ore mining drilling device according to claim 1, characterized in that, The drill pipe body includes an outer drill sleeve (301), a drill cylinder (302) is fitted inside the outer drill sleeve (301), and a core rod (303) can be fitted inside the drill cylinder (302); The front and rear ends of the drill barrel (302) are respectively provided with a drill bit (312) and a plugging block (306). The outer drill sleeve (301) can be clamped between the drill bit (312) and the plugging block (306) to achieve axial positioning of the outer drill sleeve (301) and the drill barrel (302). The inner wall of the outer drill sleeve (301) is provided with several slots (3011), the main body of the outer drill sleeve (301) is provided with an axially penetrating drainage channel (3012), the outer drill sleeve (301) is provided with a first insertion hole (3013) and several sets of drill bit slots (3015), and the outer wall of the outer drill sleeve (301) is provided with several drainage grooves (3014). The drill barrel (302) is provided with a drill bit holder (3021) and a guide block (3022), and a second insertion hole (3023) is also provided through the drill barrel (302). The first insertion hole (3013) and the second insertion hole (3023) are arranged to overlap; the drill bit holder (3021) and the guide block (3022) can be inserted into the slot (3011).

3. The iron ore mining drilling device according to claim 2, characterized in that, The adjustment assembly (304) includes: an adjustment seat (3041) that can be set into the first insertion hole (3013) and the second insertion hole (3023), a center rod (3042) rotatably connected to the adjustment seat (3041), an active adjustment gear (3043) provided on the center rod (3042), and a driven adjustment gear (3044) that can mesh with the active adjustment gear (3043) sleeved on the core rod (303).

4. The iron ore mining drilling device according to claim 3, characterized in that, The reaming assembly includes: a drill bit (311) mounted on a drill bit holder (3021), and a push block (308) that can be inserted into the drill barrel (302) and connected to the core rod (303); a bushing (309) is provided in the drill bit slot (3015), and the drill bit (311) can pass through the bushing (309) and protrude from the surface of the outer drill sleeve (301); the bottom of the drill bit holder (3021) is provided with an elastic element (310) for resetting the drill bit (311).

5. The iron ore mining drilling device according to claim 4, characterized in that, The outer wall of the push block (308) is uniformly provided with several push grooves extending along its axial direction; The push groove includes a guide groove (3081) and a limiting groove (3083) located in the same groove opening, and a connecting part (3082) is provided between the guide groove (3081) and the limiting groove (3083). The drill bit (311) body has a cutting head (3112) and a cutting tail (3113) at both ends, and a protrusion (3111) on the side of the drill bit (311) body; the protrusion (3111) can be contained in the push groove and can abut against the bottom of the guide groove (3081); the cutting tail (3113) can abut against the elastic member (310) and the bushing (309); The inner side of the bushing (309) is provided with a sealing plate (3091), and one side of the cutting head (3112) can abut against the sealing plate (3091).

6. The iron ore mining drilling device according to claim 2, characterized in that, The drill bit (312) has a drainage ring groove (3121) on its back, and a coolant hole (3122) is provided through the drill bit (312). The coolant hole (3122) is connected to the drainage ring groove (3121); the outlet of the drainage channel (3012) can be connected to the drainage ring groove (3121). The back of the drill bit (312) also has a protruding support seat (3123), and one end of the core rod (303) is rotatably connected to the support seat (3123).

7. The iron ore mining drilling device according to claim 6, characterized in that, The sealing block (306) is provided with a transition hole (3061), and an elastic support (305) is inserted into the transition hole (3061); one end of the core rod (303) can be rotatably inserted into the transition hole (3061), and the elastic support (305) can provide axial preload for the core rod (303).

8. The iron ore mining drilling device according to claim 2, characterized in that, The tail of the outer drill sleeve (301) is provided with a manifold (307). The inlet of the manifold (307) is connected to a rotary joint (4) that can communicate with the external coolant. The coolant can be introduced into the drainage channel (3012) through the rotary joint (4).

9. The iron ore mining drilling device according to claim 2, characterized in that, The transmission box (2) includes: a housing (201) and an end cover (202) that mates with it; an outer drill sleeve (301) is rotatably connected to the housing (201) and the end cover (202); The transmission box (2) is equipped with a transmission shaft (204) that can be driven by the drive unit (1). The transmission shaft (204) is equipped with a drive gear (203), and the tail of the outer drill sleeve (301) is equipped with a driven gear (205) that can mesh with the drive gear (203). The transmission shaft (204) can drive the outer drill sleeve (301) to rotate through gear engagement.

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