Core drilling tool for coal mine

Abstract

The utility model relates to the technical field of coring drilling tools, and discloses a coring drilling tool for a coal mine, which comprises a coring drilling tool body, a fixing sleeve is fixed at the top of the coring drilling tool body, a driving rod is arranged in the fixing sleeve, slots are symmetrically arranged on the outer wall surface of the driving rod, an inserting block is inserted in each slot, and a coring hole is formed in the outer wall surface of the driving rod. Each inserting block is fixed to a semicircular plate, the two semicircular plates are in butt joint to surround the driving rod, each semicircular plate is further fixed to a movable rod, each movable rod penetrates through a fixing sleeve and is in sliding connection with the fixing sleeve, a connecting block is fixed to the other end of each movable rod, and a spring is arranged outside each movable rod in a sleeving mode. The two ends of each spring are fixed to the outer wall face of the fixing sleeve and the outer wall face of the connecting block respectively. The circumferential positioning of the driving rod is realized through the matching of the insertion block and the driving rod insertion groove, and the driving rod is further fixed by matching with a hoop structure formed by the semicircular plate, so that the coring efficiency and the integrity rate are improved, and the operation safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mine coring drills, specifically a coring drill for coal mines. Background Technology

[0002] Currently, in the geological exploration stage before coal mine development, drilling and sampling are necessary to accurately assess the coal seam occurrence conditions and coal quality. During sampling, coring drill bits are typically used. Existing coring drill bits are held and fixed to the drive rod by a clamping sleeve. The inner surface of the clamping sleeve is generally smooth, which leads to installation instability. This causes radial displacement at the connection between the drive rod and the drill bit, and under high-speed rotation, the connection is prone to loosening. When the drill bit encounters hard interbedded rock layers, sudden torque changes can cause stress concentration at the connection, potentially leading to drill bit deformation or breakage. This not only reduces the efficiency and integrity of coring but also poses a risk of accidental detachment of drill components, causing in-hole accidents. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a core drilling tool for coal mines, which addresses the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a core drilling tool for coal mines, including a core drilling tool body, a fixed sleeve fixed to the top of the core drilling tool body, a drive rod arranged inside the fixed sleeve, slots symmetrically opened on the outer wall of the drive rod, a plug block inserted into each slot, each plug block being fixed to a semi-circular plate, two semi-circular plates being joined together and surrounding the outside of the drive rod, each semi-circular plate being fixed to a movable rod, each movable rod passing through the fixed sleeve and slidably connected to the fixed sleeve, a connecting block being fixed to the other end of each movable rod, and a spring being fitted on the outside of each movable rod, with both ends of each spring being fixed to the outer wall of the fixed sleeve and the outer wall of the connecting block, respectively.

[0005] Furthermore, a fixing block is fixed to the top of the core drilling tool body. When the insert block is inserted into the slot, the bottom of the drive rod contacts the top of the fixing block. An annular seat is fixed to the bottom outer periphery of the fixing sleeve.

[0006] Furthermore, a limiting rod is also installed on the fixed sleeve. The limiting rod is U-shaped and includes an arc rod and two straight rods. A limiting block is fixed below the end of the two straight rods. Two through holes are opened on the outer wall of the fixed sleeve. The two straight rods pass through the two through holes respectively. Grooves 1 and 2 are opened sequentially from the outside to the inside on the upper surface of each movable rod. Both are used to insert with the two limiting blocks of the limiting rod.

[0007] Furthermore, a fixing plate is fixed to the outer wall of the fixing sleeve, and a connecting plate is fixed to the side of the arc-shaped rod of the limiting rod facing the fixing sleeve. A lead screw is rotatably connected to the top of the fixing plate through a bearing. The lead screw passes through the connecting plate and is threadedly connected to the connecting plate. A rotating component is fixedly connected to the top of the lead screw.

[0008] Furthermore, four L-shaped rods are evenly fixed on the top of the fixed sleeve along the circumferential direction, and a limiting plate is fixed to one end of each L-shaped rod. A sliding groove is opened on the outer wall of the drive rod corresponding to each limiting plate, and the limiting plate is slidably placed inside the sliding groove.

[0009] Furthermore, a vertical plate is fixed to the top of each connecting block, and a rectangular hole is provided on the vertical plate. A round rod is fixed to the outer wall of the fixed sleeve, and a rectangular rod is rotatably connected to the end of the round rod.

[0010] Furthermore, the shape and size of the rectangular rod are matched with those of the rectangular hole, so that the rectangular rod can pass through the rectangular hole when it is vertical.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This utility model achieves circumferential positioning of the drive rod through the cooperation of the insert block and the drive rod slot, and further fixes the drive rod with the clamp structure formed by the semi-circular plate, forming a double fixation guarantee.

[0013] 2. The drive rod of this utility model has a sliding groove on its outer circumferential surface. The limiting plate fixed on the L-shaped rod above the fixed sleeve is placed in the sliding groove, which can limit the drive rod axially and improve the stability and reliability of the installation.

[0014] 3. This utility model uses a limiting rod to fix the position of the movable rod. After the drive rod is installed in place, the rotation of the lead screw drives the limiting rod to move, so that the limiting blocks at the front ends of the straight rods on both sides of the limiting rod are respectively inserted into the grooves of the two movable rods to form an interlock. When disassembly is required, rotating the lead screw drives the connecting plate to move, causing the limiting blocks of the limiting rod to exit the groove. Then, pulling the connecting block releases the restriction of the two inserts and the semi-circular plate on the drive rod. Finally, rotating the rotating part inserts the end of the limiting rod into the groove, thereby fixing the position of the movable rod and the two semi-circular plates, facilitating the disassembly of the core drilling tool body and the drive rod. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is an enlarged view of A of this utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the fixing sleeve of this utility model.

[0019] In the diagram: 1. Core drilling tool body; 2. Fixing sleeve; 21. Annular seat; 22. Through hole; 23. Sliding groove; 3. Insert block; 4. Semicircular plate; 5. Movable rod; 51. Groove one; 52. Groove two; 6. Connecting block; 7. Spring; 8. Limiting rod; 81. Limiting block; 9. Fixing plate; 10. Connecting plate; 11. Lead screw; 12. Rotating component; 13. L-shaped rod; 14. Limiting plate; 15. Vertical plate; 151. Rectangular hole; 16. Round rod; 17. Rectangular rod; 18. Drive rod; 19. Fixing block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figures 1-4 As shown, this utility model provides a core drilling tool for coal mines, including a core drilling tool body 1. A fixing sleeve 2 is fixed to the top of the core drilling tool body 1. A drive rod 18 is provided inside the fixing sleeve 2. Slots are symmetrically opened on the outer wall of the drive rod 18. A plug block 3 is inserted into each slot. Each plug block 3 is fixed to a semi-circular plate 4. Two semi-circular plates 4 are joined together and surround the outside of the drive rod 18. Each semi-circular plate 4 is also fixed to a movable rod 5. Each movable rod 5 passes through the fixing sleeve 2 and is slidably connected to the fixing sleeve 2. A connecting block 6 is fixed to the other end of each movable rod 5. A spring 7 is fitted on the outside of each movable rod 5, and the two ends of each spring 7 are fixed to the outer wall of the fixing sleeve 2 and the outer wall of the connecting block 6, respectively.

[0022] The top of the core drilling tool body 1 is fixed with a fixing block 19. When the insert block 3 is inserted into the slot, the bottom of the drive rod 18 contacts the top of the fixing block 19. The bottom outer periphery of the fixing sleeve 2 is fixed with an annular seat 21.

[0023] Specifically, the fixing block 19 is used to improve the stability of the drive rod 18, and the ring seat 21 is used to strengthen the firmness of the fixing sleeve 2.

[0024] The fixed sleeve 2 is also equipped with a limiting rod 8, which is U-shaped and includes an arc rod and two straight rods. A limiting block 81 is fixed below the end of the two straight rods. Two through holes 22 are opened on the outer wall of the fixed sleeve 2. The two straight rods pass through the two through holes 22 respectively and can move up and down in the through holes 22. Grooves 1 51 and 2 52 are opened sequentially from the outside to the inside on the upper surface of each movable rod 5, both of which are used to insert into the two limiting blocks 81 of the limiting rod 8.

[0025] A fixing plate 9 is fixed to the outer wall of the fixing sleeve 2. A connecting plate 10 is fixed to the side of the arc-shaped rod of the limiting rod 8 facing the fixing sleeve 2. A lead screw 11 is rotatably connected to the top of the fixing plate 9 through a bearing. The lead screw 11 passes through the connecting plate 10 and is threadedly connected to the connecting plate 10. A rotating part 12 is fixedly connected to the top of the lead screw 11.

[0026] Four L-shaped rods 13 are evenly fixed to the top of the fixed sleeve 2 along the circumferential direction, and a limiting plate 14 is fixed to one end of each L-shaped rod 13. A sliding groove 23 is opened on the outer wall of the drive rod 18 corresponding to each limiting plate 14, and the limiting plate 14 is slidably placed inside the sliding groove 23. The stability of the drive rod 18 is increased by setting the L-shaped rods 13 and the limiting plates 14.

[0027] Each of the connecting blocks 6 has a vertical plate 15 fixed to its top. The vertical plate 15 has a rectangular hole 151. A round rod 16 is fixed to the outer wall of the fixing sleeve 2. The end of the round rod 16 is rotatably connected to a rectangular rod 17 through a damping shaft.

[0028] The rectangular rod 17 is matched in shape and size with the rectangular hole 151 so that the rectangular rod 17 can pass through the rectangular hole 151 when it is vertical.

[0029] In this utility model, the bottom of the core drilling tool body 1 has a cutter head (not shown in the figure), and the drive rod 18 is a component for driving the core drilling tool body 1 to rotate.

[0030] During installation, first rotate the rotating component 12 to drive the lead screw 11 to rotate. The lead screw 11 drives the limiting rod 8 to move upward through the connecting plate 10, so that the limiting rod 8 separates from the movable rod 5. The movable rod 5 can move in the horizontal direction. At this time, adjust the direction of the rectangular rod 14 to be consistent with the direction of the rectangular hole 151 on the vertical plate 15, and pull the movable rod 5 outward to separate the two semicircular plates 4. Then, place the driving rod 18 inside the fixed sleeve 2, and place the limiting plates 14 on the four L-shaped rods 13 above the fixed sleeve 2 outside the corresponding driving rods 18. In the slide groove 23, at this time, the spring 7 provides preload force, and the two movable rods 5 drive the semi-circular plate 4 and the insert 3 to move toward the drive rod 18, so that the two inserts 3 are inserted into the slots respectively, and the two semi-circular plates 4 surround the drive rod 18. At this time, the rotating part 12 rotates in the opposite direction, which drives the lead screw 11 to rotate, so that the limiting rod 8 moves down, and the limiting block 81 is inserted into the groove 51 on the movable rod 5 to limit and fix the movable rod 5, so that the insert 3 is stably inserted into the inside of the slot, thereby making the drive rod 18 and the fixed sleeve 2 firmly installed.

[0031] During disassembly, rotating the rotating part 12 drives the lead screw 11 to rotate. The lead screw 11 drives the limiting rod 8 to move upward through the connecting plate 10, so that the limiting rod 8 disengages from the groove 51. Then, the two connecting blocks 6 are pulled outward. With the cooperation of the spring 7, the connecting block 6, the vertical plate 15, and the rectangular rod 17, the movable rod 5 drives the semi-circular plate 4 and the insert block 3 to move away from the driving rod 18, thus releasing the restriction on the driving rod 18. When the groove 52 on the movable rod 5 moves to correspond with the limiting block 81 at the front end of the limiting rod 8, the rectangular rod 17 passes through the rectangular hole 151 on the vertical plate 15. Then, the rectangular rod 17 is rotated so that it is in a cross state with the rectangular hole 151, thereby limiting the connecting block 6 and fixing the position of the movable rod 5. At this point, rotate the rotating part 12 in the opposite direction to move the limiting rod 8 downward, so that the limiting block 81 at the front end of the limiting rod 8 is inserted into the groove 52, thereby further strengthening the fixation of the movable rod 5, and moving the driving rod 18 upward to separate the driving rod 18 from the core drilling tool body 1.

[0032] It is worth noting that all the technologies not described in the above manual are existing technologies and are not the main innovations, so they will not be described in detail here.

[0033] This utility model provides a core drilling tool for coal mines. There are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A core drilling tool for coal mines, comprising a core drilling tool body, characterized in that, The top of the core drilling tool body is fixed with a fixed sleeve. A drive rod is provided inside the fixed sleeve. Slots are symmetrically opened on the outer wall of the drive rod. A plug is inserted into each slot. Each plug is fixed to a semi-circular plate. Two semi-circular plates are joined together and surround the outside of the drive rod. Each semi-circular plate is also fixed to a movable rod. Each movable rod passes through the fixed sleeve and is slidably connected to the fixed sleeve. A connecting block is fixed at the other end of each movable rod. A spring is fitted on the outside of each movable rod, and the two ends of each spring are fixed to the outer wall of the fixed sleeve and the outer wall of the connecting block, respectively.

2. The core drilling tool for coal mines as described in claim 1, characterized in that, The top of the core drilling tool body is fixed with a fixing block. When the insertion block is inserted into the slot, the bottom of the drive rod contacts the top of the fixing block. An annular seat is fixed to the bottom outer periphery of the fixing sleeve.

3. A core drilling tool for coal mines as described in claim 1, characterized in that, The fixed sleeve is also equipped with a limiting rod, which is U-shaped and includes an arc rod and two straight rods. A limiting block is fixed below the end of the two straight rods. Two through holes are opened on the outer wall of the fixed sleeve, and the two straight rods pass through the two through holes respectively. Grooves 1 and 2 are opened from the outside to the inside on the upper surface of each movable rod, both of which are used to insert into the two limiting blocks of the limiting rod.

4. A core drilling tool for coal mines as described in claim 1, characterized in that, A fixing plate is fixed to the outer wall of the fixing sleeve. A connecting plate is fixed to the side of the arc-shaped rod of the limiting rod facing the fixing sleeve. A lead screw is rotatably connected to the top of the fixing plate through a bearing. The lead screw passes through the connecting plate and is threadedly connected to the connecting plate. A rotating component is fixedly connected to the top of the lead screw.

5. A core drilling tool for coal mines as described in claim 1, characterized in that, Four L-shaped rods are evenly fixed on the top of the fixed sleeve along the circumferential direction, and a limit plate is fixed to one end of each L-shaped rod. A sliding groove is opened on the outer wall of the drive rod corresponding to each limit plate, and the limit plate is slidably placed inside the sliding groove.

6. A core drilling tool for coal mines as described in claim 1, characterized in that, Each of the connecting blocks has a vertical plate fixed to its top, and a rectangular hole is provided on the vertical plate. A round rod is fixed to the outer wall of the fixed sleeve, and a rectangular rod is rotatably connected to the end of the round rod.

7. A core drilling tool for coal mines as described in claim 6, characterized in that, The rectangular rod is matched in shape and size with the rectangular hole so that the rectangular rod can pass through the rectangular hole when it is vertical.

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