Rescue down-the-hole hammer drilling machine with drill bit convenient to replace
By using a multi-positioning mechanism with limiting blocks and magnetic repulsion, the problem of easy deformation when connecting the drill bit and output head is solved, achieving higher connection stability and drilling accuracy, and extending the service life of the equipment.
Patent Information
- Application Number
- CN202511117937.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-11
- Publication Date
- 2025-10-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing rescue down-the-hole hammer drills, the bolt connection between the drill bit and the output head is prone to thread deformation due to reaction force and high-frequency impact, which affects the connection stability and drilling accuracy, leading to equipment wear and reduced operating efficiency.
The system employs a multi-limiting mechanism, using a limit block with a threadless structure and magnetic repulsion to achieve rigid contact and limit between the drill bit and the output head, thereby distributing the load, preventing thread wear, and improving connection stability and coaxial accuracy.
It effectively maintains the coaxial accuracy of the drill bit and output head, extends the maintenance cycle, reduces the risk of detachment, and improves connection reliability and drilling efficiency.
Smart Images
Figure CN120844906A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hammer drill technology, specifically a rescue down-the-hole hammer drill that facilitates drill bit replacement. Background Technology
[0002] A rescue down-the-hole hammer drill is an important piece of equipment used for drilling in rescue operations. It uses compressed air or hydraulic power to drive the piston inside the down-the-hole hammer, causing it to reciprocate at high frequency within the cylinder. The piston impacts the drill bit, transferring the impact energy to the rock surface and causing the rock to break.
[0003] The bolted connection between the drill bit and the output head has significant drawbacks. During operation, the drill bit is subjected to the combined effects of rock reaction force and high-frequency impact from the down-the-hole hammer, resulting in severe and irregular vibrations. Under these conditions, the axial tension, radial torque, and impact force between the drill bit and the output head are almost entirely borne by the support bolts. This connection relies solely on the thread engagement between the drill bit and the output head. As the vibration continues to impact, the bolt preload gradually decreases, and the thread profile gradually undergoes plastic deformation under alternating loads. When the thread deformation accumulates to a certain extent, tiny gaps that are difficult to detect with the naked eye will appear at the connection point. These gaps not only compromise the coaxial accuracy of the drill bit and the down-the-hole hammer but also cause eccentric vibrations when the drill bit rotates at high speed. This vicious cycle exacerbates equipment wear, leading to out-of-tolerance borehole roundness and verticality deviations, severely affecting the efficiency and quality of rescue drilling operations. Summary of the Invention
[0004] In view of the problem that the threads of bolts are easily deformed when subjected to the pressure of drill bits and output heads in the prior art, resulting in a decrease in the stability of the connection between the two, the present invention provides a rescue down-the-hole hammer drill that facilitates the replacement of drill bits.
[0005] The technical solution adopted by the present invention to solve its technical problem is: a rescue down-the-hole hammer drill that facilitates the replacement of drill bits, including a mounting frame, a first motor fixedly mounted on the top of the mounting frame, a mounting base slidably connected to the mounting frame, a second motor fixedly mounted on the mounting base, a hydraulic tank fixedly connected to the mounting base at the bottom position corresponding to the second motor, an output head movably connected inside the hydraulic tank, and a drill bit threadedly connected to the bottom end of the output head; The output head is threaded with a lifting ring, the output head has symmetrically arranged slots inside, the output head has multiple first limiting blocks slidably connected to the outer wall of the output head, the drill head has a first limiting groove at the position corresponding to the first limiting block, and the drill head has symmetrically arranged second limiting grooves. The output head is equipped with a multi-limiting mechanism for limiting the drill bit. The multi-limiting mechanism includes a fixed rod, a first magnet fixedly connected to the top of the fixed rod, and symmetrically arranged second limiting blocks slidably connected to the fixed rod. The top of each of the second limiting blocks is fixedly connected to a first spring via a vertical block. A guide rod is fixedly connected to the bottom of the fixed rod, and multiple second springs are fixedly connected to the outer wall of the guide rod. A passage groove is opened on the outer wall of the fixed rod at the position corresponding to the second spring. A lifting block is slidably connected to the guide rod, and a second magnet is fixedly connected to the top of the lifting block.
[0006] Specifically, the mounting frame has symmetrically arranged round rods fixedly connected to it, and a lead screw is rotatably connected to the middle position of the round rods in the mounting frame. The top ends of the round rods slide through the mounting base together. The top end of the lead screw is fixedly connected to the output end of the first motor. The lead screw is threadedly connected to the mounting base. The output end of the second motor is fixedly connected to the output head at the position inside the hydraulic tank.
[0007] Specifically, the fixing rod is fixedly connected inside the output head, and one end of the first spring is fixedly connected to the inner wall of the fixing rod.
[0008] Specifically, the bottom end of the first magnet is set as the north pole, the top end of the second magnet is set as the north pole, there is a strong repulsive force between the first magnet and the second magnet, and both the first magnet and the lifting block are conical.
[0009] Specifically, one of the outer walls of the first limiting block is inclined, one of the bottom corners of the second limiting block is inclined, one end of the first limiting block slides through the corresponding first limiting groove and the passage groove, one end of the second limiting block slides through the corresponding second limiting groove and is inserted into the slot, the inner wall of the lifting ring abuts against the other end of the first limiting block, and the position where the first limiting block passes through the passage groove abuts against the second spring, and both the first spring and the second spring are in a contracted state.
[0010] The beneficial effects of this invention are: The multi-limiting mechanism, by setting multiple threadless first and second limit blocks, disperses the axial tension, radial torque, and impact force between the drill bit and the output head to multiple contact surfaces. The limit blocks abandon threaded engagement, transmitting load through rigid contact and mechanical limiting, fundamentally eliminating the risk of micro-deformation caused by repeated vibration. This effectively maintains the coaxial accuracy of the drill bit and output head, improving the connection tightness. Compared to bolted connections, which suffer from issues like drill hole roundness deviation and perpendicularity offset due to thread wear, the multi-limiting mechanism has a longer service life, significantly reducing the frequency of disassembly, inspection, and replacement of damaged parts. It extends the average maintenance cycle of the drill bit and output head several times over, and significantly improves connection reliability and stability, ensuring the efficiency and accuracy of rescue drilling operations while reducing the risk of drill bit detachment due to connection failure. Attached Figure Description
[0011] The present invention will be further described below with reference to the accompanying drawings and examples.
[0012] Figure 1 This is a front view provided for the present invention; Figure 2 Rear view provided for the present invention; Figure 3 This invention provides a structural diagram showing the separation of the output head and drill bit. Figure 4 This invention provides a structural diagram of the bottom end of the output head. Figure 5 A cross-sectional view of the output head provided by the present invention; Figure 6 This is a structural diagram of the first limiting block pressing against the lifting block, as provided by the present invention.
[0013] In the diagram: 1. Mounting bracket; 2. First motor; 3. Mounting base; 4. Second motor; 5. Hydraulic tank; 6. Output head; 7. Drill bit; 8. Lifting ring; 9. Slot; 10. First limiting block; 11. First limiting groove; 12. Second limiting groove; 13. Multiple limiting mechanism; 14. Fixed rod; 15. First magnet; 16. Second limiting block; 17. First spring; 18. Guide rod; 19. Second spring; 20. Passage groove; 21. Lifting block; 22. Second magnet; 23. Round rod; 24. Lead screw. Detailed Implementation
[0014] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0015] Please see Figures 1 to 6 The present invention provides the following technical solutions: Example 1: A rescue down-the-hole hammer drill for easy bit replacement includes a mounting frame 1. A first motor 2 is fixedly mounted on the top of the mounting frame 1. A mounting base 3 is slidably connected to the mounting frame 1. A second motor 4 is fixedly mounted on the mounting base 3. A hydraulic tank 5 is fixedly connected to the mounting base 3 at the bottom position corresponding to the second motor 4. An output head 6 is movably connected inside the hydraulic tank 5. A drill bit 7 is threadedly connected to the bottom end of the output head 6. Symmetrically arranged round rods 23 are fixedly connected in the mounting frame 1. A lead screw 24 is rotatably connected in the mounting frame 1 at the middle position corresponding to the round rods 23. The top ends of the round rods 23 slide through the mounting base 3. The top end of the lead screw 24 is fixedly connected to the output end of the first motor 2. The lead screw 24 is threadedly connected to the mounting base 3. The output end of the second motor 4 is fixedly connected to the output head 6 at the position inside the hydraulic tank 5. In use, the mounting bracket 1 can be installed on an external mobile machine, and the external hydraulic delivery pipe can be connected to the hydraulic tank 5. During drilling, the first motor 2 and the second motor 4 are started. The first motor 2 will drive the lead screw 24 to rotate. The rotation of the lead screw 24 will drive the mounting base 3 to move down. The downward movement of the mounting base 3 is guided by the round rod 23. The second motor 4 will drive the output head 6 in the hydraulic tank 5 to rotate. At the same time, the external hydraulic delivery pipe will cause the output head 6 to generate a downward impact force through hydraulic power. At this time, the output head 6 will drive the drill bit 7 to rotate and impact the drilling point on the ground to carry out the drilling work.
[0016] Example 2: The technical solution of this example that differs from that of Example 1 includes: a lifting ring 8 is threadedly connected to the output head 6, symmetrically arranged slots 9 are opened inside the output head 6, multiple first limiting blocks 10 are slidably connected to the outer wall of the output head 6, first limiting grooves 11 are opened on the drill bit 7 at the positions corresponding to the first limiting blocks 10, and second limiting grooves 12 are symmetrically arranged on the drill bit 7. The output head 6 is equipped with a multi-limiting mechanism 13 for limiting the drill bit 7. The multi-limiting mechanism 13 includes a fixed rod 14. A first magnet 15 is fixedly connected to the top of the fixed rod 14. A symmetrically arranged second limiting block 16 is slidably connected to the fixed rod 14. A first spring 17 is fixedly connected to the top of each of the second limiting blocks 16 through a vertical block. A guide rod 18 is fixedly connected to the bottom of the fixed rod 14. A plurality of second springs 19 are fixedly connected to the outer wall of the guide rod 18. A passage groove 20 is opened on the outer wall of the fixed rod 14 at the position corresponding to the second spring 19. A lifting block 21 is slidably connected to the guide rod 18. A second magnet 22 is fixedly connected to the top of the lifting block 21. The fixing rod 14 is fixedly connected to the inside of the output head 6. One end of the first spring 17 is fixedly connected to the inner wall of the fixing rod 14. The bottom end of the first magnet 15 is set as the north pole, and the top end of the second magnet 22 is set as the north pole. There is a strong repulsive force between the first magnet 15 and the second magnet 22. The first magnet 15 and the lifting block 21 are both conical. One of the outer walls of the first limiting block 10 is inclined. One of the bottom corners of the second limiting block 16 is inclined. One end of the first limiting block 10 slides through the corresponding first limiting groove 11 and the passage groove 20. One end of the second limiting block 16 slides through the corresponding second limiting groove 12 and is inserted into the slot 9. The inner wall of the lifting ring 8 abuts against the other end of the first limiting block 10. The position where the first limiting block 10 passes through the passage groove 20 abuts against the second spring 19. The first spring 17 and the second spring 19 are both in a contracted state.
[0017] When using it, if drill bit 7 needs to be installed, such as Figure 3Insert drill bit 7 into output head 6, then rotate drill bit 7. Drill bit 7 will slowly penetrate into output head 6, and fixing rod 14 will be inserted into drill bit 7. At this point, the first limiting groove 11 on drill bit 7 will correspond to the first limiting block 10, and the second limiting groove 12 on drill bit 7 will correspond to the second limiting block 16 and slot 9. Then, insert external tool into lifting ring 8 and rotate lifting ring 8. Lifting ring 8 will move downwards due to its threads. The bottom end of the downward-moving lifting ring 8 will press against the inclined outer wall of the first limiting block 10. The first limiting block 10, under pressure, will move into output head 6, then through the first limiting groove 11 on drill bit 7, and then into the passage groove 20 on fixing rod 14. The moving first limiting block 10 will... The second spring 19 is compressed and contracted, while the first limiting block 10 also compresses the bottom end of the lifting block 21 during its movement. The bottom end of the lifting block 21, under pressure, moves upward, guided by the guide rod 18. The upward movement of the lifting block 21 drives the second magnet 22 to move upward. The upward movement of the second magnet 22 compresses the corner of the inclined setting of the second limiting block 16. At this time, the two second limiting blocks 16 move in opposite directions, and at the same time, each of the second limiting blocks 16 compresses and contracts the corresponding first spring 17. The moving second limiting block 16 passes through the second limiting groove 12 on the drill bit 7 and then inserts into the slot 9 inside the output head 6. At this time, the lifting ring 8 has finished moving downward, completing the multiple fixation between the drill bit 7 and the output head 6. The vibration force of drill bit 7 acts on the first limiting block 10, the second limiting block 16, the first limiting groove 11, the second limiting groove 12, the passage groove 20, and the slot 9. Multiple components work together to bear the pressure on the output head 6 and drill bit 7, ensuring even pressure distribution. The support of each component prevents the vibration force from acting on the threads of the output head 6 and drill bit 7, avoiding deformation of the initial connection threads. Furthermore, since the components are not supported by threads, there is no issue of deformation due to strong vibration in a short time. This enhances the connection stability between the output head 6 and drill bit 7 and makes installation more convenient, facilitating the replacement and disassembly of drill bit 7. When disassembling drill bit 7, simply return the lifting ring 8 upwards; at this time, the first limiting block 10 loses the lifting ring. When pressed, the second spring 19 will return to its original position. The returned second spring 19 will push the first limiting block 10 out of the passage groove 20 and the first limiting groove 11. At this time, the lifting block 21 will also lose the pressure from the first limiting block 10. The repulsive force between the first magnet 15 and the second magnet 22 will cause the second magnet 22 to return downwards. The second magnet 22 will return downwards together with the lifting block 21. At this time, both first springs 17 will drive the second limiting block 16 to return to its original position. The second limiting block 16 will move out of the slot 9 and then out of the second limiting groove 12. At this time, the drill bit 7 loses its multiple fixations and can be directly rotated and removed. The lifting ring 8 is only threadedly connected to the output head 6 and does not bear the pressure of the connection between the output head 6 and the drill bit 7.Therefore, the threads on the lifting ring 8 will not deform or shift due to pressure.
[0018] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A rescue down-the-hole hammer drill for easy bit replacement, comprising a mounting frame (1), a first motor (2) fixedly mounted on the top of the mounting frame (1), a mounting base (3) slidably connected to the mounting frame (1), a second motor (4) fixedly mounted on the mounting base (3), a hydraulic tank (5) fixedly connected to the mounting base (3) at the bottom position corresponding to the second motor (4), an output head (6) movably connected inside the hydraulic tank (5), and a drill bit (7) threadedly connected to the bottom end of the output head (6); Its features are: The output head (6) is threaded with a lifting ring (8), and the output head (6) has symmetrically arranged slots (9) inside. The outer wall of the output head (6) is slidably connected with multiple first limiting blocks (10). The drill bit (7) has first limiting grooves (11) at the positions corresponding to the first limiting blocks (10), and the drill bit (7) has symmetrically arranged second limiting grooves (12). The output head (6) is provided with a multi-limiting mechanism (13) for limiting the drill bit (7). The multi-limiting mechanism (13) includes a fixed rod (14). A first magnet (15) is fixedly connected to the top of the fixed rod (14). A second limiting block (16) is symmetrically arranged and slidably connected to the fixed rod (14). A first spring (17) is fixedly connected to the top of each of the second limiting blocks (16) through a vertical block. A guide rod (18) is fixedly connected to the bottom of the fixed rod (14). A plurality of second springs (19) are fixedly connected to the outer wall of the guide rod (18). A passage groove (20) is opened at the position of the second spring (19) on the outer wall of the fixed rod (14). A lifting block (21) is slidably connected to the guide rod (18). A second magnet (22) is fixedly connected to the top of the lifting block (21).
2. A rescue down-the-hole hammer drill for easy bit replacement according to claim 1, characterized in that: The mounting bracket (1) is fixedly connected with symmetrically arranged round rods (23). A lead screw (24) is rotatably connected to the middle position of the round rods (23) in the mounting bracket (1). The top ends of the round rods (23) slide through the mounting base (3). The top end of the lead screw (24) is fixedly connected to the output end of the first motor (2). The lead screw (24) is threadedly connected to the mounting base (3). The output end of the second motor (4) is fixedly connected to the output head (6) at the position inside the hydraulic tank (5).
3. A rescue down-the-hole hammer drill for easy bit replacement according to claim 1, characterized in that: The fixing rod (14) is fixedly connected inside the output head (6), and one end of the first spring (17) is fixedly connected to the inner wall of the fixing rod (14).
4. A rescue down-the-hole hammer drill for easy bit replacement according to claim 1, characterized in that: The bottom end of the first magnet (15) is set as the north pole, and the top end of the second magnet (22) is set as the north pole. There is a strong repulsive force between the first magnet (15) and the second magnet (22). Both the first magnet (15) and the lifting block (21) are cone-shaped.
5. A rescue down-the-hole hammer drill for easy bit replacement according to claim 1, characterized in that: One of the outer walls of the first limiting block (10) is inclined, and one of the bottom corners of the second limiting block (16) is inclined. One end of the first limiting block (10) slides through the corresponding first limiting groove (11) and passage groove (20), and one end of the second limiting block (16) slides through the corresponding second limiting groove (12) and is inserted into the slot (9). The inner wall of the lifting ring (8) abuts against the other end of the first limiting block (10). The position where the first limiting block (10) passes through the passage groove (20) abuts against the second spring (19). The first spring (17) and the second spring (19) are both in a contracted state.