A drilling rig pipe rotating speed detection device

Abstract

The application relates to the technical field of anchor rod drilling tools, and discloses a drilling rod rotating speed detection device for a drill carriage, which comprises a drill box, a drilling rod is used for being threadedly connected with an output shaft of the drill box, a first rotating gear and a second rotating gear are both rotationally arranged on an annular mounting rail, the first rotating gear and the second rotating gear are in meshing connection, the first rotating gear is provided with a first spiral hole, a first spiral rod is movably arranged on the annular mounting rail and is screw-connected with the first spiral hole, the end of the first spiral rod is provided with an acting surface, and an acting end surface is pushed to the acting surface after movement; a second spiral rod is arranged on the second rotating gear, a first detection gear is movably arranged relative to the annular mounting rail and is provided with a second spiral hole, the second spiral rod is screw-connected with the second spiral hole, a first detection sensor is arranged on the drill box and located on one side of the first detection gear. Through the technical scheme, the technical problem that the drilling speed cannot be monitored and adjusted in the drilling operation of the related technical drill box is solved.

Description

Technical Field

[0001] This invention relates to the field of anchor drilling tools, specifically to a drill rod rotation speed detection device for drilling rigs. Background Technology

[0002] In coal mining, with the industry's advancement, most support processes have become mechanized and are moving towards intelligent operation. While existing drill rigs offer a fixed drilling speed, they lack the ability to monitor and adjust this speed. This prevents timely adjustments to the operating speed based on varying working conditions and face hardness, potentially leading to safety issues such as rod breakage due to mismatched speed and feed rate, severely impacting safe operation and work efficiency. In short, existing drill rigs have significant inconveniences and shortcomings, urgently requiring improvement and upgrading. Summary of the Invention

[0003] This invention proposes a drill rod rotation speed detection device for drilling rigs, which solves the technical problem that the drilling speed cannot be monitored or adjusted in drilling box drilling operations.

[0004] The technical solution of the present invention is as follows: A drill pipe rotation speed detection device for drilling rigs, comprising: A drill housing, the drill housing having an output shaft, the output shaft being rotatably mounted, the output shaft having an annular mounting edge. A drill rod, used for threaded connection with the output shaft, wherein the end of the drill rod near the output shaft has a working end face. A first rotating gear and a second rotating gear are both rotatably mounted on the annular mounting edge. The first rotating gear and the second rotating gear mesh with each other. The first rotating gear has a first helical hole. A first helical rod is movably disposed on the annular mounting edge and helically connected to the first helical hole. The end of the first helical rod has an acting surface, and the acting end surface pushes against the acting surface after it moves. The second helical rod is mounted on the second rotating gear. A first detection toothed disc, movably disposed relative to the annular mounting edge, has a second helical hole, and a second helical rod is threadedly connected to the second helical hole. The first detection sensor is disposed on the drill box and located on one side of the first detection gear.

[0005] As a further technical solution, the number of teeth on the first rotating gear is greater than the number of teeth on the second rotating gear.

[0006] As a further technical solution, it also includes A guide rod is disposed on the annular mounting edge and arranged in a plurality of circles. The first detection gear has a guide hole, and the guide rod is slidably disposed in the guide hole and passes through the guide hole. A limiting edge is provided at the end of the guide rod away from the guide rod. A first elastic element, one end of which acts on the limiting edge and the other end of which acts on the annular mounting edge, provides a force that moves the limiting edge away from the annular mounting edge.

[0007] As a further technical solution, the first detection toothed disc has a perforation, through which the drill rod passes, and the inner diameter of the perforation is larger than the outer diameter of the drill rod; the outer wall of the first detection toothed disc has a plurality of first detection teeth arranged in a circle; it also includes a first thrust bearing, which is disposed on the surface to be acted upon.

[0008] As a further technical solution, it also includes A mounting ring is disposed on the guide rod at one end away from the annular mounting edge. A second thrust bearing is disposed on the mounting ring on the side away from the first detection gear.

[0009] As a further technical solution, a second toothed disk assembly is also included. The second toothed disk assembly is disposed on the first detection toothed disk and includes a fan-shaped toothed disk. The fan-shaped toothed disk slides radially along the drill rod and rotates axially on the first detection toothed disk. The outer wall of the fan-shaped toothed disk has a plurality of circumferentially arranged second teeth, and the inner wall has a friction cylindrical surface. The second thrust bearing is located on one side of the fan-shaped toothed disk. After the fan-shaped toothed disk is pushed and slid, the fan-shaped toothed disk abuts against the second thrust bearing, and the fan-shaped toothed disk continues to slide until the friction cylindrical surface abuts against the outer wall of the drill rod, so that the fan-shaped toothed disk rotates together with the drill rod.

[0010] As a further technical solution, the fan-shaped toothed disk has a conical outer wall on one side and a conical inner wall on one side of the first detection toothed disk. The conical outer wall slides along the conical inner wall to realize the radial sliding of the fan-shaped toothed disk along the drill rod.

[0011] As a further technical solution, the second toothed disk assembly also includes a guide member. The first detection toothed disk has an annular groove on one side wall near the sector toothed disk. The guide member is slidably disposed in the annular groove. The guide member has a guide groove, the direction of which is parallel to the generatrix of the conical outer wall. The sector toothed disk also has a guide portion, which is slidably disposed in the guide groove.

[0012] As a further technical solution, the guide portion has an action flange and also includes a second elastic member, one end of which acts on the action flange and the other end of which acts on the guide member, providing a force to move the fan-shaped toothed disc away from the drill rod.

[0013] As a further technical solution, the several fan-shaped toothed discs are brought close together to form a circle, and a second detection sensor is also included. The second detection sensor is disposed on the drill box and located on one side of the fan-shaped toothed discs.

[0014] The working principle and beneficial effects of this invention are as follows: In this invention, considering the existing anchor drilling rigs where the output shaft and drill rod speed data of the drill box are unmeasurable during anchor drilling operations, a first detection gear disc is designed to rotate synchronously with the output shaft to achieve full-process measurability of the operating speed. A first detection sensor performs real-time detection on the first detection gear disc, thereby enabling the monitoring and adjustment of the drilling speed during drill box drilling operations. This facilitates real-time control of the drilling speed in conjunction with other structures. Furthermore, the operating speed can be adjusted at any time according to the working conditions and the monitored rotation speed to avoid breakage caused by speed mismatch, thereby increasing operational safety and improving work efficiency.

[0015] In this invention, during the installation of the drill rod, the output shaft of the drill box can push the first detection gear plate to align with the first detection sensor, thus enabling automatic detection of whether the drill rod is effectively installed in the working position based on whether the drill rod is working inside the output shaft, avoiding the situation where the drill rod is detached from the output shaft without being detected. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 for Figure 2 Schematic diagram of the sectional structure of the middle AA section; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB; In the diagram: Drill box-1, output shaft-101, annular mounting edge-102, drill rod-2, working end face-201, first rotating gear-3, second rotating gear-4, first helical hole-301, first helical rod-5, acted surface-501, first detection gear-6, second helical hole-601, guide hole-602, through hole-603, first detection tooth-604, conical inner wall-605, first detection sensor-7, guide rod-8, and the first... Two-tooth disc assembly -9, sector-shaped toothed disc -901, second tooth -902, friction cylindrical surface -903, conical outer wall -904, guide component -905, annular groove -606, guide groove -906, guide part -907, action stop edge -908, limiting edge -10, first thrust bearing -11, mounting ring -12, second thrust bearing -13, second elastic component -14, second detection sensor -15, second helical rod -16, first elastic component -17. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-4 As shown, this embodiment proposes a drill pipe rotation speed detection device for drilling rigs, including... Drill box 1, drill box 1 has an output shaft 101, the output shaft 101 is rotatably configured, the output shaft 101 has an annular mounting edge 102. Drill rod 2 is used for threaded connection with output shaft 101. The end of drill rod 2 near output shaft 101 has a working end face 201. A first rotating gear 3 and a second rotating gear 4 are both rotatably mounted on the annular mounting edge 102. The first rotating gear 3 and the second rotating gear 4 mesh with each other. The first rotating gear 3 has a first helical hole 301. The first helical rod 5 is movably mounted on the annular mounting edge 102 and helically connected to the first helical hole 301. The end of the first helical rod 5 has an acting surface 501, and the acting end surface 201 is pushed towards the acting surface 501 after it moves. The second helical rod 16 is mounted on the second rotating gear 4. The first detection toothed disc 6 is mounted in a ring and movable along 102. It has a second helical hole 601, and a second helical rod 16 is threadedly connected to the second helical hole 601. The first detection sensor 7 is mounted on the drill box 1 and is located on one side of the first detection gear plate 6.

[0020] In this embodiment, considering the existing anchor drilling rigs, there is a problem that the speed data of the output shaft 101 of the drill box 1 and the drill rod 2 cannot be measured during the anchor drilling operation. In order to achieve full-process measurability of the operating speed, a first detection gear 6 is designed to rotate synchronously with the output shaft 101. The first detection sensor 7 performs real-time detection on the first detection gear 6, which facilitates cooperation with other structures to achieve real-time control of the drilling speed. In addition, the operating speed can be adjusted at any time according to the working conditions and the monitored rotation speed to avoid breakage caused by speed mismatch, increase operational safety, and improve work efficiency.

[0021] In this embodiment, during the installation of the drill rod 2, the output shaft 101 of the drill box 1 can push the first detection toothed plate 6 to align with the first detection sensor 7 from misalignment. Therefore, it can automatically detect whether the drill rod 2 is effectively installed in the working position based on whether the drill rod 2 is working inside the output shaft 101, thus avoiding the situation where the drill rod 2 is detached from the output shaft 101 but cannot be detected.

[0022] In this embodiment, considering that the installation and movement direction of the drill rod 2 is opposite to the movement direction of the first detection gear 6, the movement of the first detection gear 6 is designed to be achieved through the transmission of the first rotating gear 3, the second rotating gear 4, the first helical rod 5, and the second helical rod 16. This effectively achieves the simultaneous installation of the drill rod 2 and the simultaneous detection of it by the first detection gear 6 and the first detection sensor 7. Not only can the speed of the output shaft 101 be detected through the first detection gear 6 and the first detection sensor 7, but it can also determine whether the drill rod 2 is installed in the effective position of the output shaft 101, achieving the goal of killing two birds with one stone.

[0023] In use, the drill rod 2 is installed onto the output shaft 101. The working end face 201 of the drill rod 2 pushes the acting surface 501 of the first helical rod 5, causing the first helical rod 5 to move and act on the first helical hole 301, causing the first rotating gear 3 to rotate. The rotation of the first rotating gear 3 drives the second rotating gear 4 to rotate, which in turn drives the second helical rod 16 fixed thereon to rotate. The rotation of the second helical rod 16 causes the first detection gear 6 to move closer to the first detection sensor 7. When the drill rod 2 is installed in the working position of the output shaft 101, the first detection gear 6 is pushed to align with the first detection sensor 7, allowing the first detection sensor 7 to detect the speed of the first detection gear 6, thus achieving real-time detection of the speed of the output shaft 101. During operation, if the first detection sensor 7 fails to detect the first detection gear 6, it indicates a problem with the installation of the drill rod 2, requiring immediate inspection to prevent drill rod breakage. This would prevent a situation where the output shaft 101 speed measurement is correct, but the drill rod 2 is detached from the output shaft 101 without being detected. The solution in this embodiment solves the problem of unmeasurable speed data during anchor bolt operation, making the operation speed measurable throughout the process. This facilitates real-time control of drilling speed when combined with other structures, and allows for adjustment of the operation speed at any time based on the monitored rotation speed, according to working conditions. This avoids breakage caused by speed mismatch, increases operational safety, and improves work efficiency.

[0024] Furthermore, it also includes a guide rod 8, which is disposed on the annular mounting edge 102 and is arranged in several circumferential patterns. The first detection gear 6 has a guide hole 602. The guide rod 8 is slidably disposed in the guide hole 602 and passes through the guide hole 602. The limiting edge 10 is disposed at the end of the guide rod 8 away from the guide rod 8. One end of the first elastic member 17 acts on the limiting edge 10, and the other end acts on the annular mounting edge 102, providing a force to the limiting edge 10 away from the annular mounting edge 102.

[0025] In this embodiment, to ensure more stable sliding of the first detection toothed disc 6 relative to the annular mounting edge 102, the first detection toothed disc 6 is designed to have a guide hole 602, and the first detection toothed disc 6 is mounted on the guide rod 8. The guide rod 8 can slide stably on the guide hole 602, thereby ensuring the sliding accuracy and stability of the first detection toothed disc 6. In this embodiment, a first elastic element 17 is also designed. One end of the first elastic element 17 acts on the limiting edge 10 at the end of the guide rod 8, and the other end acts on the annular mounting edge 102, so that the position of the first detection toothed disc 6 can be automatically reset after the drill rod 2 is removed from the output shaft 101; it can also be used to make the position of the first detection toothed disc 6 move away from the first detection sensor 7 when there is a problem with the installation of the drill rod 2 on the output shaft 101, thereby determining whether the drill rod 2 is disengaged from the output shaft 101 or there is a problem with the connection.

[0026] Furthermore, the first detection toothed disc 6 has a through hole 603 through which the drill rod 2 passes, and the inner diameter of the through hole 603 is larger than the outer diameter of the drill rod 2; the outer wall of the first detection toothed disc 6 has a plurality of first detection teeth 604 arranged in a circle; it also includes a first thrust bearing 11, which is disposed on the surface 501 to be acted upon.

[0027] In this embodiment, considering that the movement range of the first detection toothed disc 6 interferes with the outer wall of the drill rod 2, the first detection toothed disc 6 is designed to have a through hole 603. The through hole 603 can make way for the drill rod 2 and avoid collision between the first detection toothed disc 6 and the drill rod 2. Considering that when the acting surface 501 of the first helical rod 5 interacts with the acting end surface 201 of the drill rod 2, that is, when the drill rod 2 is installed on the output shaft 101, the drill rod 2 needs to be rotated for installation, and then the first helical rod 5 only moves. Therefore, there will be frictional rotation when the two come into contact. In order to reduce the influence of friction on rotation, a first thrust bearing 11 is designed on the acting surface 501 of the first helical rod 5, so that the rotation of the drill rod 2 during installation can also effectively push the first helical rod 5 to move, avoiding relative rotation during contact and causing friction.

[0028] Furthermore, it also includes a mounting ring 12, which is disposed on one end of the guide rod 8 away from the annular mounting edge 102, and a second thrust bearing 13 is disposed on the side of the mounting ring 12 away from the first detection gear 6.

[0029] Furthermore, it also includes a second toothed disk assembly 9, which is disposed on the first detection toothed disk 6. The second toothed disk assembly 9 includes a sector toothed disk 901, which slides radially along the drill rod 2 and rotates axially on the first detection toothed disk 6. The outer wall of the sector toothed disk 901 has a plurality of circumferentially arranged second teeth 902, and the inner wall has a friction cylindrical surface 903. The second thrust bearing 13 is located on one side of the sector toothed disk 901. After the sector toothed disk 901 is pushed and slid, the sector toothed disk 901 abuts against the second thrust bearing 13, and the sector toothed disk 901 continues to slide until the friction cylindrical surface 903 abuts against the outer wall of the drill rod 2, so that the sector toothed disk 901 rotates together with the drill rod 2.

[0030] In this embodiment, considering that the first detection sensor 7 can only detect the rotational speed of the output shaft 101, whether the drill rod 2 is properly installed on the output shaft 101, and whether the drill rod 2 is disengaged from its working position through the first detection gear 6, but still cannot directly monitor the speed of the drill rod 2, a second gear assembly 9 is designed to enable direct monitoring of the speed of the drill rod 2. The second gear assembly 9 can be directly connected to the drill rod 2, thereby enabling direct speed measurement of the drill rod 2. When the speed of the drill rod 2 is different from the speed of the output shaft 101 of the drill box 1, it indicates that there is a problem with the connection between the drill rod 2 and the output shaft 101. At this time, the speed measurement of the second gear assembly 9 can be detected in time. Specifically, when the drill rod 2 is installed onto the output shaft 101, as the drill rod 2 is screwed more and more onto the output shaft 101, the end of the second helical rod 16 has a mounting ring 12. The second thrust bearing 13 on the mounting ring 12 pushes the fan-shaped toothed disk 901 of the second toothed disk assembly 9 to slide radially, so that the friction cylindrical surface 903 on the inner wall of the fan-shaped toothed disk 901 comes into frictional contact with the drill rod 2, thereby achieving synchronous rotation of the drill rod 2. The fan-shaped toothed disk 901 is arranged in multiple circumferences, and after the friction cylindrical surface 903 comes into frictional contact with the drill rod 2, the multiple fan-shaped toothed disks 901 will merge into a circle, thereby achieving speed detection with the same accuracy as the first detection toothed disk 6. The addition of the second thrust bearing 13 is to ensure that the fan-shaped toothed disk 901 can rotate relative to the first detection toothed disk 6, and to avoid the fan-shaped toothed disk 901 and the mounting ring 12 being unable to rotate relative to each other.

[0031] Furthermore, the fan-shaped toothed disk 901 has a conical outer wall 904 on one side, and the first detection toothed disk 6 has a conical inner wall 605 on one side. The conical outer wall 904 slides along the conical inner wall 605 to realize the radial sliding of the fan-shaped toothed disk 901 along the drill rod 2.

[0032] In this embodiment, the fan-shaped toothed disk 901 slides radially along the drill rod 2 by the relative sliding of the conical outer wall 904 of the fan-shaped toothed disk 901 on the conical inner wall 605 of the first detection toothed disk 6. After the conical outer wall 904 slides on the conical inner wall 605, the multiple fan-shaped toothed disks 901 will move closer together radially, thereby achieving the contact between the friction cylinder 903 and the drill rod 2, achieving the effect of stable connection with the drill rod 2.

[0033] Furthermore, the second toothed disk assembly 9 also includes a guide member 905. The first detection toothed disk 6 has an annular groove 606 on one side wall near the fan-shaped toothed disk 901. The guide member 905 is slidably disposed in the annular groove 606. The guide member 905 has a guide groove 906. The direction of the guide groove 906 is parallel to the generatrix of the conical outer wall 904. The fan-shaped toothed disk 901 also has a guide portion 907, which is slidably disposed in the guide groove 906.

[0034] In this embodiment, considering that the fan-shaped toothed disk 901 and the first detection toothed disk 6 are in a rotational relationship, so that the fan-shaped toothed disk 901 corresponds to the drill rod 2 speed and the first detection toothed disk 6 corresponds to the output shaft 101 speed, in order to ensure that the fan-shaped toothed disk 901 and the first detection toothed disk 6 can both rotate and have a stable structure, a guide member 905 is specially designed to be rotatably set in the annular groove 606 of the first detection toothed disk 6, and the annular groove 606 can be dovetail-shaped or T-shaped, thereby preventing the guide member 905 from disengaging from the annular groove 606, and the guide part 907 of the fan-shaped toothed disk 901 is guided in the guide groove 906 of the guide member 905, while ensuring that the fan-shaped toothed disk 901 slides along the generatrix of the conical outer wall 904. This not only ensures structural stability, but also effectively realizes the radial sliding of the fan-shaped toothed disk 901 along the drill rod 2 and its axial rotation on the first detection toothed disk 6.

[0035] Furthermore, the guide portion 907 has an action flange 908 and also includes a second elastic member 14. One end of the second elastic member 14 acts on the action flange 908 and the other end acts on the guide member 905, providing a force to the fan-shaped toothed disc 901 away from the drill pipe 2.

[0036] In this embodiment, an action stop 908 is designed on the guide part 907. One end of the second elastic member 14 acts on the action stop 908, and the other end acts on the guide member 905, thereby providing a force to move the fan-shaped toothed disk 901 away from the drill rod 2. This allows the fan-shaped toothed disk 901 to be reset when the drill rod 2 is removed from the output shaft 101 of the drill box 1, thus avoiding interference and influence of the fan-shaped toothed disk 901 on the connecting drill rod 2.

[0037] Furthermore, several fan-shaped toothed disks 901 approach each other and merge into a circle, and also include a second detection sensor 15, which is disposed on the drill box 1 and located on one side of the fan-shaped toothed disks 901.

[0038] In this embodiment, the outer wall of the fan-shaped toothed disk 901 has several circumferentially arranged second teeth 902. The second teeth 902 can be detected by the second detection sensor 15, thereby realizing the direct detection of the speed of the fan-shaped toothed disk 901, that is, the direct detection of the speed of the drill rod 2. Even if the drill rod 2 and the output shaft 101 of the drill box 1 rotate relative to each other, the information can be obtained by monitoring the second teeth 902 through the second detection sensor 15, so as to make timely adjustments and avoid major failures.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drill rod rotation speed detection device for a drilling rig, characterized in that, include A drill box (1) has an output shaft (101) which is rotatably disposed and has an annular mounting edge (102). Drill rod (2), which is used to be threaded to the output shaft (101), and the end of the drill rod (2) near the output shaft (101) has an active end face (201). A first rotating gear (3) and a second rotating gear (4) are rotatably mounted on the annular mounting edge (102). The first rotating gear (3) and the second rotating gear (4) mesh with each other. The first rotating gear (3) has a first helical hole (301). The first helical rod (5) is movably disposed on the annular mounting edge (102) and is helically connected to the first helical hole (301). The end of the first helical rod (5) has an acting surface (501), and the acting end surface (201) is pushed towards the acting surface (501) after it moves. The second helical rod (16) is mounted on the second rotating gear (4). A first detection toothed disc (6) is movably disposed relative to the annular mounting edge (102) and has a second helical hole (601). The second helical rod (16) is threadedly connected to the second helical hole (601). The first detection sensor (7) is disposed on the drill box (1) and located on one side of the first detection toothed disc (6); Guide rod (8) is disposed on the annular mounting edge (102) and is arranged in several circumferentially. The first detection toothed disk (6) has a guide hole (602). The guide rod (8) is slidably disposed in the guide hole (602) and passes through the guide hole (602). Mounting ring (12), the mounting ring (12) being disposed on the guide rod (8) at one end away from the annular mounting edge (102), The second thrust bearing (13) is disposed on the side of the mounting ring (12) away from the first detection gear (6); The second toothed disk assembly (9) is disposed on the first detection toothed disk (6) and includes a fan-shaped toothed disk (901). The fan-shaped toothed disk (901) slides radially along the drill rod (2) and rotates axially on the first detection toothed disk (6). The outer wall of the fan-shaped toothed disk (901) has a plurality of circumferentially arranged second teeth (902), and the inner wall has a friction cylindrical surface (903). The second thrust bearing (13) is located on one side of the fan-shaped toothed disk (901). After the fan-shaped toothed disk (901) is pushed and slid, the fan-shaped toothed disk (901) abuts against the second thrust bearing (13), and the fan-shaped toothed disk (901) continues to slide until the friction cylindrical surface (903) abuts against the outer wall of the drill rod (2), so that the fan-shaped toothed disk (901) rotates together with the drill rod (2).

2. The drill rod rotation speed detection device for a drilling rig according to claim 1, characterized in that, The number of teeth of the first rotating gear (3) is greater than the number of teeth of the second rotating gear (4).

3. The drill pipe rotation speed detection device for a drilling rig according to claim 1, characterized in that, Also includes: A limiting edge (10) is provided at one end of the guide rod (8) away from the guide rod (8). A first elastic element (17) has one end acting on the limiting edge (10) and the other end acting on the annular mounting edge (102), providing a force that moves the limiting edge (10) away from the annular mounting edge (102).

4. The drill rod rotation speed detection device for a drilling rig according to claim 1, characterized in that, The first detection toothed disc (6) has a through hole (603), through which the drill rod (2) passes, and the inner diameter of the through hole (603) is larger than the outer diameter of the drill rod (2); the outer wall of the first detection toothed disc (6) has a plurality of first detection teeth (604) arranged in a circle; it also includes a first thrust bearing (11), which is disposed on the surface to be acted (501).

5. A drill rod rotation speed detection device for a drilling rig according to claim 1, characterized in that, The fan-shaped toothed disc (901) has a conical outer wall (904) on one side, and the first detection toothed disc (6) has a conical inner wall (605) on one side. The conical outer wall (904) slides along the conical inner wall (605) to realize the radial sliding of the fan-shaped toothed disc (901) along the drill rod (2).

6. The drill rod rotation speed detection device for a drilling rig according to claim 5, characterized in that, The second toothed disc assembly (9) also includes The guide (905) has an annular groove (606) on one side wall of the first detection toothed disk (6) near the sector toothed disk (901). The guide (905) is slidably disposed in the annular groove (606). The guide (905) has a guide groove (906). The direction of the guide groove (906) is parallel to the generatrix of the conical outer wall (904). The sector toothed disk (901) also has a guide portion (907). The guide portion (907) is slidably disposed in the guide groove (906).

7. The drill pipe rotation speed detection device for a drilling rig according to claim 6, characterized in that, The guide portion (907) has a working stop (908) and also includes The second elastic element (14) acts on the action flange (908) at one end and on the guide element (905) at the other end, providing a force to the sector toothed disc (901) away from the drill rod (2).

8. The drill pipe rotation speed detection device for a drilling rig according to claim 6, characterized in that, Several of the aforementioned sector-shaped toothed disks (901) come close to each other and merge into a circle, and also include The second detection sensor (15) is disposed on the drill box (1) and located on one side of the fan-shaped toothed disc (901).

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