A coal mine drilling rig with a drill bit that is easy to replace

Abstract

The present application relates to the technical field of drilling machine, disclose a kind of coal mine drilling machine of drill bit convenient to replace, including host, the side of host is provided with limit seat, the output end of host side close to limit seat is fixedly connected with shaft rod, the end of shaft rod away from host is fixedly connected with screw rod, screw rod is threadedly connected with metal drill bit, the side of metal drill bit close to limit seat is provided with telescopic rod, the end of telescopic rod away from metal drill bit is fixedly connected with limit ring, the side of limit ring close to metal drill bit is fixedly connected with gear ring, the side of limit seat close to gear ring is rotatably connected with bearing, the side of limit seat close to gear ring is rotatably connected with mounting rod, the end of mounting rod away from limit seat is fixedly connected with transmission gear, this coal mine drilling machine of drill bit convenient to replace, can avoid when drill bit just completes drilling work, drill bit temperature is higher, leading to drill bit replacement work cannot be carried out in time, make the problem of influence drilling work efficiency.

Description

Technical Field

[0001] This invention relates to the field of drilling rig technology, specifically to a coal mine drilling rig that facilitates drill bit replacement. Background Technology

[0002] Coal mine drilling rigs are important equipment used for underground drilling operations in coal mines. With the development of society, coal mine drilling rigs are also constantly improving. Among them, tracked coal mine drilling rigs are a manifestation of the progress of traditional coal mine drilling rigs. This type of coal mine drilling rig is a device that integrates a tracked walking structure. Tracked coal mine drilling rigs work on the same principle as traditional coal mine drilling rigs. The power head provides drilling power, the drilling cylinder transmission chain drives the power head to provide feed force, and the luffing mechanism adjusts the drilling direction. However, the traditional coal mine drilling rig is equipped with tracks for easy movement. The tracks allow it to move in more complex terrain, thus completing various drilling tasks more efficiently. The drill bit structure of a tracked coal mine drilling rig typically consists of a shaft and a drill bit. A screw is located at the end of the drill shaft, and the drill bit has a threaded groove. The drill bit can be fixed to the shaft by the engagement of the screw and the threaded groove. However, the drill bit wears out significantly during drilling operations, requiring frequent replacements. When replacing the drill bit, its high temperature immediately after drilling makes disassembly and replacement difficult, affecting the overall drilling efficiency. Therefore, we propose a coal mine drilling rig that facilitates drill bit replacement. Summary of the Invention

[0003] The purpose of this invention is to provide a coal mine drilling rig that facilitates drill bit replacement, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a coal mine drilling rig that facilitates drill bit replacement, comprising a main unit, a limiting seat being provided on one side of the main unit, a shaft being fixedly connected to the output end of the main unit near the limiting seat, a screw being fixedly connected to the end of the shaft away from the main unit, a metal drill bit being threadedly connected to the screw, a telescopic rod being provided on the side of the metal drill bit near the limiting seat, a limiting ring being fixedly connected to the end of the telescopic rod away from the metal drill bit, a gear ring being fixedly connected to the side of the limiting ring near the metal drill bit, and mounting plates being rotatably connected to the top and bottom of the limiting ring, with a limiting plate fixedly connected to the mounting plate; The limiting seat is rotatably connected to a bearing on the side near the metal drill bit, and a fixing ring is fitted on the bearing. The limiting seat is rotatably connected to an mounting rod on the side near the gear ring, and a transmission gear is fixedly connected to the end of the mounting rod away from the limiting seat. The transmission gear meshes with the gear ring.

[0005] Preferably, a connector is fixedly connected to the end of the telescopic rod near the metal drill bit, and a magnet A is fitted and fixedly connected to the end of the connector away from the telescopic rod.

[0006] Preferably, the metal drill bit has a mating groove on the side near the telescopic rod, and the mating head is fitted and snapped into the mating groove.

[0007] Preferably, the top and bottom of the fixing ring are provided with slots, and the limiting plates are fitted into the slots on the same side. The end of the limiting plate away from the mounting plate is fitted and fixedly connected with a magnet piece B.

[0008] Preferably, a threaded sleeve is rotatably connected to the side of the limiting seat near the gear ring, a reciprocating screw is internally threaded to the threaded sleeve, a mounting bracket is fixedly connected to the end of the reciprocating screw away from the limiting seat, and a brush body is fixedly connected to the side of the mounting bracket near the gear ring, the brush body contacting the tooth groove wall of the gear ring.

[0009] Preferably, a limiting groove is provided on the side of the limiting seat near the gear ring, and a limiting rod is fixedly connected to the end of the reciprocating screw near the limiting groove. The limiting rod is located in the limiting groove and is slidably connected to it.

[0010] Preferably, both the threaded sleeve and the mounting rod are fitted with pulleys that are fixedly connected, and a transmission belt is provided between the two pulleys.

[0011] Preferably, the limiting seat has a connecting hole, the shaft passes through the connecting hole through the limiting seat, and the limiting ring, gear ring and bearing are all sleeved on the outside of the shaft.

[0012] Preferably, a handle is fixedly connected to the side of the transmission gear away from the mounting rod, the handle is offset from the center of the transmission gear, and the surface of the handle is covered with an anti-slip pad.

[0013] Preferably, the bottom of the main unit is provided with a track, and a control console is fixedly connected to the side of the main unit away from the limiting seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a main unit to fix the shaft, then rotates the transmission gear to drive the gear ring to rotate. At this time, the gear ring drives the metal drill bit to rotate through the telescopic rod. During the rotation, the metal drill bit can be dislodged from the screw. When replacing the new metal drill bit, the mating groove of the new metal drill bit is locked onto the mating head, and the new metal drill bit is fixed by the magnet A. Then, the thread groove of the new metal drill bit is aligned with the screw, and then the transmission gear is rotated in the opposite direction. Using the reverse rotation of the gear ring and the telescopic rod, the new metal drill bit can be installed on the shaft. This avoids the problem that the drill bit temperature is high when the drill bit has just finished drilling, which makes it impossible to replace the drill bit in time and affects the drilling efficiency. This effectively improves the auxiliary function of the device for drill bit replacement. When the shaft and drill bit rotate synchronously for drilling, the shaft drives the gear ring to rotate synchronously. During this rotation, the gear ring can drive the transmission gear and mounting rod to rotate in the opposite direction. At this time, through the cooperation between the mounting rod, the pulley on the threaded sleeve, and the transmission belt, the threaded sleeve is driven to rotate. Meanwhile, the reciprocating screw is limited by the limiting rod and the limiting groove. Therefore, during the rotation of the threaded sleeve, the reciprocating screw can move back and forth repeatedly. At this time, the brush body, which moves back and forth with the reciprocating screw, can clean the dust and impurity particles in the gap between the teeth of the gear ring, thus preventing the dust and impurity particles generated during drilling from adhering between the teeth of the gear ring and causing the transmission effect between the gear ring and the transmission gear to deteriorate. This invention, by embedding a magnet A in the mating head, can quickly limit the movement between the telescopic rod and the drill bit. At the same time, due to the telescopic rod's telescopic feature, the drill bit can drive the telescopic rod to extend during the extension of the shaft, ensuring that the length of the telescopic rod always matches the length of the shaft. This allows the telescopic rod to drive the drill bit even when the shaft is of different lengths, improving the assistance in changing drill bits when the shaft is of different lengths. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the limiting seat and its connecting components of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the metal drill bit of the present invention; Figure 4 This is a schematic diagram of the telescopic rod structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the limiting ring and the bearing of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the limiting seat of the present invention; Figure 7 For the present invention Figure 4The diagram shows an enlarged view of area A. Figure 8 For the present invention Figure 5 The diagram shows an enlarged view of area B. Figure 9 For the present invention Figure 6 The diagram shows an enlarged view of region C.

[0016] In the diagram: 1. Main unit; 11. Track; 12. Control console; 13. Limit seat; 14. Limit groove; 2. Shaft; 21. Screw; 22. Metal drill bit; 23. Connecting groove; 3. Telescopic rod; 31. Connecting joint; 32. Magnet A; 4. Limit ring; 41. Gear ring; 42. Mounting plate; 43. Limiting plate; 44. Magnet B; 5. Bearing; 51. Fixing ring; 52. Slot; 6. Mounting rod; 61. Transmission gear; 62. Handle; 7. Threaded sleeve; 71. Reciprocating screw; 72. Mounting bracket; 73. Brush body; 74. Limiting rod; 8. Pulley; 81. Transmission belt. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-9 This invention provides a technical solution: a coal mine drilling rig that facilitates drill bit replacement, comprising a main unit 1, a track 11 at the bottom of the main unit 1, a control console 12 fixedly connected to the side of the main unit 1 away from the limiting seat 13, a limiting seat 13 on one side of the main unit 1, a shaft 2 fixedly connected to the output end of the main unit 1 near the limiting seat 13, a screw 21 fixedly connected to the end of the shaft 2 away from the main unit 1, a metal drill bit 22 threadedly connected to the screw 21, and multiple metal protrusions provided at the end of the metal drill bit 22 away from the screw 21. These metal protrusions can improve the drilling effect of the metal drill bit 22 on the rock strata in the coal mine area. A connecting hole is provided on the limiting seat 13, and the shaft 2 passes through the limiting seat 13 through the connecting hole.

[0019] Furthermore, the main unit 1 is the main structure of the drive mechanism. The main unit 1 includes a drive mechanism and a luffing mechanism. The drive mechanism provides drilling power through a power head, and the drilling cylinder transmission chain drives the power head to provide feed force to complete the drilling work of the shaft 2 and the metal drill bit 22. At the same time, the luffing mechanism adjusts the tilt angle of the shaft 2 to adjust the drilling orientation. During operation, the operator can control the drilling machine through the control console 12, including moving the drilling machine using the crawler 11 and controlling the main unit 1 to complete the drilling work. By setting a limit seat 13, it can cooperate with the main unit 1 to provide multi-point support for the shaft 2, improving the stability of the shaft 2 during drilling. It should be noted that the drive mechanism and luffing mechanism in the above components are existing technologies, and therefore will not be described in detail in this solution.

[0020] Combined with appendix Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, a telescopic rod 3 is provided on the side of the metal drill bit 22 near the limiting seat 13. A connector 31 is fixedly connected to one end of the telescopic rod 3 near the metal drill bit 22. A magnet A32 is fitted and fixedly connected to the other end of the connector 31 away from the telescopic rod 3. A mating groove 23 is provided on the side of the metal drill bit 22 near the telescopic rod 3, and the connector 31 is fitted and snapped into the mating groove 23. A limiting ring 4 is fixedly connected to the other end of the telescopic rod 3 away from the metal drill bit 22. A toothed ring 41 is fixedly connected to the other side of the limiting ring 4 near the metal drill bit 22. Mounting plates 42 are rotatably connected to the top and bottom of the limiting ring 4. A limiting plate 43 is fixedly connected to the mounting plate 42. The limiting seat 13 is located near the metal drill bit 22. A bearing 5 is rotatably connected to the side, and a fixing ring 51 is fitted on the bearing 5. A mounting rod 6 is rotatably connected to the side of the limiting seat 13 near the gear ring 41. A transmission gear 61 is fixedly connected to the end of the mounting rod 6 away from the limiting seat 13. The transmission gear 61 meshes with the gear ring 41. The top and bottom of the fixing ring 51 are both provided with slots 52. Limiting plates 43 are fitted into the slots 52 on the same side. A magnet B44 is fixedly connected to the end of the limiting plate 43 away from the mounting plate 42. When assembling the limiting ring 4, the limiting ring 4 is first fitted onto the shaft 2, then the end of the shaft 2 away from the screw 21 is connected to the main unit 1. Then, the limiting ring 4 is moved closer to the bearing 5, and the mounting plate 42 is rotated. The limiting plate 43 is engaged in the slot 52 of the fixing ring 51, and the fixing ring 51 is attracted by the magnet B44 to complete the connection between the limiting ring 4 and the bearing 5. Since the inner and outer rings of the bearing 5 are independently movable parts, the friction between the bearing 5 and the limiting seat 13 can be reduced during the rotation of the limiting ring 4, so that the limiting ring 4 and the gear ring 41 can still rotate synchronously with the shaft 2 when the shaft 2 rotates at high speed. Due to the connection method between the limiting ring 4 and the bearing 5, which is a magnetic attraction and snap-fit ​​connection, the disassembly of the limiting ring 4 is relatively simple and quick. The telescopic rod 3 is also connected to the metal drill bit 22 by the connector 31 and the magnet A32 using a magnetic attraction and snap-fit ​​method, which makes the connection between the limiting ring 4 and the bearing 5 relatively simple and quick. The telescopic rod 3 allows for quick removal of the metal drill bit 22 without affecting its transmission to the metal drill bit 22, further improving efficiency during drill bit replacement. A handle 62 is fixedly connected to the side of the transmission gear 61 away from the mounting rod 6. The handle 62 is offset from the center of the transmission gear 61 and is covered with an anti-slip pad. The limiting ring 4, gear ring 41, and bearing 5 are all fitted around the shaft 2. A damping layer is provided between the inner wall of the limiting ring 4 and the outer surface of the shaft 2, allowing the shaft 2 to rotate while driving the limiting ring 4. When the shaft 2 is fixed in place, the limiting ring 4 and gear ring 41 can rotate freely, making it easier to replace the metal drill bit 22.

[0021] Furthermore, when the metal drill bit 22 is damaged and needs to be replaced, the main unit 1 is shut down. Using the locking structure built into the main unit 1, the shaft 2 is fixed in place. At this time, the operator holds the handle 62 and drives the transmission gear 61 to rotate. During the rotation of the transmission gear 61, the gear ring 41 and the limiting ring 4 can rotate. During this rotation, the gear ring 41 can independently drive the metal drill bit 22 to rotate via the telescopic rod 3. As the metal drill bit 22 rotates, it will move along the screw 21 and fall off. During the process, the distance between the metal drill bit 22 and the gear ring 41 increases, causing the metal drill bit 22 to extend the telescopic rod 3, allowing it to detach smoothly from the screw 21. Since the magnetic piece A32 on the connector 31 continues to attract the metal drill bit 22, it is ensured that the metal drill bit 22 will not fall directly to the ground when it detaches from the screw 21. After removing the metal drill bit 22 from the connector 31, the mating groove 23 of the new metal drill bit 22 is engaged with the connector 31. At this point, the magnetic piece A32 holds the new metal drill bit... The metal drill bit 22 is adsorbed, and at this time, the threaded groove of the metal drill bit 22 automatically aligns with the screw 21 on the shaft 2. Then, the new metal drill bit 22 is pushed so that its threaded groove is locked at the end of the screw 21. Then, the operator rotates the transmission gear 61 in the opposite direction. At this time, the transmission gear 61 drives the metal drill bit 22 to screw onto the screw 21. During the process of the metal drill bit 22 screwing onto the screw 21, the distance between the metal drill bit 22 and the gear ring 41 becomes shorter. At this time, the metal drill bit 22 will drive the telescopic rod 3 to retract. After the installation is completed, drilling can continue. During the drilling process... When the drive mechanism in the main unit 1 drives the shaft 2 to drill, the distance between the metal drill bit 22 and the limiting seat 13 will increase. During this process, the metal drill bit 22 will drive the telescopic rod 3 to extend, so that the length of the telescopic rod 3 always matches the length of the shaft 2. This avoids the problem of the extension length of the shaft 2 being affected by the length of the telescopic rod 3, which would affect the drilling depth. By setting the bearing 5, the friction between the limiting ring 4 and the gear ring 41 and the limiting seat 13 can be reduced, so that the limiting ring 4 and the gear ring 41 can still rotate synchronously with the shaft 2 even when the shaft 2 is rotating at high speed.

[0022] Combined with appendix Figure 6 and Figure 9As shown, a threaded sleeve 7 is rotatably connected to the side of the limiting seat 13 near the gear ring 41. A reciprocating screw 71 is internally threaded to the threaded sleeve 7. A mounting bracket 72 is fixedly connected to the end of the reciprocating screw 71 away from the limiting seat 13. A brush body 73 is fixedly connected to the side of the mounting bracket 72 near the gear ring 41. The brush body 73 contacts the tooth groove wall of the gear ring 41. A limiting groove 14 is formed on the side of the limiting seat 13 near the gear ring 41. A limiting rod 74 is fixedly connected to the end of the reciprocating screw 71 near the limiting groove 14. The limiting rod 74 is located in the limiting groove 14 and is slidably connected to it. A pulley 8 is fixedly connected to both the threaded sleeve 7 and the mounting rod 6. A transmission belt 81 is provided between the two pulleys 8.

[0023] Furthermore, during drilling operations, the rotation of shaft 2 will cause the limiting ring 4 and gear ring 41 to rotate. At this time, gear ring 41 will drive the transmission gear 61 and mounting rod 6 to rotate in the reverse direction. The mounting rod 6 and the pulley 8 on the threaded sleeve 7 cooperate with the transmission belt 81 to drive the threaded sleeve 7 to rotate. However, because the reciprocating screw 71 is limited by the limiting rod 74 and the limiting groove 14, it cannot rotate. Therefore, during the rotation of the threaded sleeve 7, the reciprocating screw 71 can move back and forth along the threaded sleeve 7. During this process, the limiting rod 74 remains within the limiting groove 14, continuously limiting the reciprocating screw 71. At this time, the mounting frame 72 and the brush body 73 move synchronously with the reciprocating screw 71. The brush body 73, moving back and forth, can clean the dust and particles between the teeth and grooves on the gear ring 41. At the same time, another brush body 73 can be installed on the top of the mounting frame 72. Through the two right-angled brush bodies 73, the gear ring 41 and the transmission gear 61 can be cleaned synchronously, improving the cleaning effect of the transmission gear 61 and the gear ring 41.

[0024] Working principle: First, the limiting ring 4 and the gear ring 41 are fitted onto the shaft 2. Then, the end of the shaft 2 away from the screw 21 is passed through the connecting hole of the limiting seat 13 and connected to the main unit 1. Then, the limiting ring 4 is moved to make it close to the bearing 5. Then, the mounting plate 42 is rotated so that the limiting plate 43 is locked in the corresponding slot 52 of the fixing ring 51. At this time, the fixing ring 51 is attracted by the magnetic piece B44, which improves the limiting effect on the limiting plate 43. At this time, the limiting ring 4 can be connected to the outer wall of the bearing 5. Then screw the metal drill bit 22 onto the screw 21 of the shaft 2, and make the mating groove 23 of the metal drill bit 22 lock onto the connector 31 of the telescopic rod 3. At this time, the magnetic piece A32 is used to attract the metal drill bit 22 to complete the connection of the metal drill bit 22. Afterwards, the staff can start the host 1 through the control console 12. At this time, the host 1 drives the shaft 2 to rotate, and the metal drill bit 22 rotates along with it, so that drilling can be carried out on the rock strata in the coal mine area. During the drilling process, when the host 1 drives the shaft 2 to drill, the metal drill bit 22 will drive the telescopic rod 3 to extend, so that the length of the telescopic rod 3 is always adapted to the length of the shaft 2. After the drilling work at the current drilling point is completed, the staff can control the crawler 11 to run through the control console 12, and use the crawler 11 to move the drilling rig to the next drilling point to carry out drilling work. When the metal drill bit 22 becomes worn and needs replacement due to prolonged use, the operator can shut down the main unit 1 via the control panel 12. Using the locking mechanism of the main unit 1, the shaft 2 is fixed in place. The operator then holds the handle 62 and rotates the transmission gear 61. During rotation, the transmission gear 61 drives the gear ring 41 and the limiting ring 4. The gear ring 41, in turn, drives the metal drill bit 22 to rotate independently via the telescopic rod 3. As the metal drill bit 22 rotates, it moves along the screw 21 and detaches. During this movement, the distance between the metal drill bit 22 and the gear ring 41 increases, causing the telescopic rod 3 to extend, allowing the metal drill bit 22 to easily detach from the screw 21. Furthermore, the magnetic plate on the connector 31... A32 continues to attract the metal drill bit 22, ensuring that it does not fall directly to the ground when it detaches from the screw 21. The metal drill bit 22 is then removed from the connector 31, and the mating groove 23 of the new metal drill bit 22 is attached to the connector 31. The new metal drill bit 22 is then attracted by the magnet A32, and its thread groove automatically aligns with the screw 21 on the shaft 2. The new metal drill bit 22 is then pushed, causing its thread groove to engage with the end of the screw 21. The operator then reverses the rotation of the transmission gear 61, causing the metal drill bit 22 to screw into the screw 21. As the metal drill bit 22 screws into the screw 21, the distance between it and the gear ring 41 shortens, causing the telescopic rod 3 to retract. Once installation is complete, drilling can continue. During drilling, the rotation of shaft 2 drives the limiting ring 4 and gear ring 41 to rotate. At this time, gear ring 41 drives the transmission gear 61 and mounting rod 6 to rotate in the opposite direction. The pulley 8 on mounting rod 6 and the transmission belt 81 on threaded sleeve 7 cooperate to drive threaded sleeve 7 to rotate. However, because reciprocating screw 71 is limited by limiting rod 74 and limiting groove 14, it cannot rotate. Therefore, during the rotation of threaded sleeve 7, reciprocating screw 71 can move back and forth along threaded sleeve 7. During this process, limiting rod 74 is always in limiting groove 14, continuously limiting reciprocating screw 71. At this time, mounting frame 72 and brush body 73 move synchronously with reciprocating screw 71. The brush body 73, which moves back and forth, can clean the dust and particles between the teeth and grooves on gear ring 41.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal mine drilling rig with easy-to-change drill bits, comprising a main unit (1), wherein a limiting seat (13) is provided on one side of the main unit (1), a shaft (2) is fixedly connected to the output end of the main unit (1) near the limiting seat (13), and a screw (21) is fixedly connected to the end of the shaft (2) away from the main unit (1), and a metal drill bit (22) is threaded onto the screw (21), characterized in that: A telescopic rod (3) is provided on the side of the metal drill bit (22) near the limiting seat (13). A limiting ring (4) is fixedly connected to the end of the telescopic rod (3) away from the metal drill bit (22). A toothed ring (41) is fixedly connected to the side of the limiting ring (4) near the metal drill bit (22). A mounting plate (42) is rotatably connected to the top and bottom of the limiting ring (4). A limiting plate (43) is fixedly connected to the mounting plate (42). The limiting seat (13) is rotatably connected to a bearing (5) on the side near the metal drill bit (22). A fixing ring (51) is fitted on the bearing (5). The limiting seat (13) is rotatably connected to an mounting rod (6) on the side near the gear ring (41). A transmission gear (61) is fixedly connected to the end of the mounting rod (6) away from the limiting seat (13). The transmission gear (61) meshes with the gear ring (41). The telescopic rod (3) is fixedly connected to a connector (31) at one end near the metal drill bit (22), and a magnet A (32) is fitted and fixedly connected to the other end of the connector (31) away from the telescopic rod (3). The metal drill bit (22) has a mating groove (23) on the side near the telescopic rod (3), and the mating head (31) is fitted and snapped into the mating groove (23); The top and bottom of the fixing ring (51) are provided with slots (52), and the limiting plate (43) is fitted into the slot (52) on the same side. The end of the limiting plate (43) away from the mounting plate (42) is fitted and fixedly connected with a magnet piece B (44). The limiting seat (13) has a connecting hole, and the shaft (2) passes through the limiting seat (13) through the connecting hole. The limiting ring (4), the gear ring (41) and the bearing (5) are all sleeved on the outside of the shaft (2).

2. A coal mine drilling rig for easy bit replacement according to claim 1, characterized in that: The limiting seat (13) is rotatably connected to a threaded sleeve (7) on the side near the gear ring (41). The threaded sleeve (7) is internally threaded with a reciprocating screw (71). The end of the reciprocating screw (71) away from the limiting seat (13) is fixedly connected to a mounting bracket (72). The side of the mounting bracket (72) near the gear ring (41) is fixedly connected to a brush body (73). The brush body (73) contacts the tooth groove wall of the gear ring (41).

3. A coal mine drilling rig for easy bit replacement according to claim 2, characterized in that: The limiting seat (13) has a limiting groove (14) on the side near the gear ring (41). The end of the reciprocating screw (71) near the limiting groove (14) is fixedly connected to a limiting rod (74). The limiting rod (74) is located in the limiting groove (14) and is slidably connected to it.

4. A coal mine drilling rig for easy bit replacement according to claim 3, characterized in that: Both the threaded sleeve (7) and the mounting rod (6) are fitted with pulleys (8) that are fixedly connected, and a transmission belt (81) is provided between the two pulleys (8).

5. A coal mine drilling rig for easy bit replacement according to claim 1, characterized in that: A handle (62) is fixedly connected to the side of the transmission gear (61) away from the mounting rod (6). The handle (62) is offset from the center of the transmission gear (61), and the surface of the handle (62) is covered with an anti-slip pad.

6. A coal mine drilling rig for easy bit replacement according to claim 1, characterized in that: The bottom of the host (1) is provided with a track (11), and a control console (12) is fixedly connected to the side of the host (1) away from the limit seat (13).

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