Coal mine drilling machine with drill bit convenient to replace

Abstract

The invention relates to the technical field of drilling machines, and discloses a coal mine drilling machine with a drill bit convenient to replace, which comprises a main machine, a limiting seat is arranged on one side of the main machine, a shaft rod is fixedly butted to the output end of one side, close to the limiting seat, of the main machine, and a screw is fixedly connected to one end, away from the main machine, of the shaft rod; a telescopic rod is slidably connected to the side, close to the limiting seat, of the metal drill bit, a limiting ring is fixedly connected to the end, away from the metal drill bit, of the telescopic rod, a gear ring is fixedly connected to the side, close to the metal drill bit, of the limiting ring, a bearing is rotatably connected to the side, close to the metal drill bit, of the limiting seat, and a mounting rod is rotatably connected to the side, close to the gear ring, of the limiting seat. According to the coal mine drilling machine with the drill bit convenient to replace, the problem that when the drill bit just completes drilling work, the temperature of the drill bit is high, so that the drill bit cannot be replaced in time, and the drilling work efficiency is affected can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling rigs, and particularly to a coal mine drilling rig that is convenient for replacing drill bits. Background Technique

[0002] Coal mine drilling rigs are important equipment for underground drilling operations in coal mines. With the development of society, coal mine drilling rigs are also constantly progressing. Among them, the crawler-type coal mine drilling rig is an embodiment of the progress of traditional coal mine drills. This type of coal mine drilling rig is a device integrated with a crawler-type walking structure; The working principle of the crawler-type coal mine drilling rig is basically the same as that of the traditional coal mine drilling rig. The power head provides drilling, the drilling cylinder drives the chain to drive the power head to provide the feed force, and the luffing mechanism is used to adjust the drilling azimuth. However, a crawler that is convenient for moving is added to the traditional coal mine drilling rig. The crawler can be used to move in relatively complex terrains, so as to more efficiently complete various drilling operations; The drill bit structure of the crawler-type coal mine drilling rig usually consists of a shaft rod and a drill bit. A section of screw rod is provided at the end of the drill pipe, and a thread groove is provided on the drill bit. The drill bit can be fixed on the shaft rod by the cooperation of the screw rod and the thread groove. However, due to the large loss of the drill bit during the drilling operation, the drill bit needs to be replaced frequently. When replacing the drill bit, since the temperature of the drill bit is relatively high just after the drilling operation, the drill bit cannot be normally disassembled and replaced at this time, which affects the efficiency of the entire drilling operation. For this reason, we propose a coal mine drilling rig that is convenient for replacing drill bits. Summary of the Invention

[0003] The purpose of the present invention is to provide a coal mine drilling rig that is convenient for replacing drill bits, so as to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A coal mine drilling rig that is convenient for replacing drill bits, including a main machine. A limit seat is arranged on one side of the main machine. The output end of the main machine close to the limit seat is fixedly butted with a shaft rod. One end of the shaft rod away from the main machine is fixedly connected with a screw rod. A metal drill bit is threadedly connected to the screw rod. One side of the metal drill bit close to the limit seat is slidably connected with a telescopic rod. One end of the telescopic rod away from the metal drill bit is fixedly connected with a limit ring. A gear ring is fixedly connected to one side of the limit ring close to the metal drill bit. Installation plates are rotatably connected to the top and bottom of the limit ring, and limit plates are fixedly connected to the installation plates; A bearing is rotatably connected to one side of the limit seat close to the metal drill bit. A fixed ring is sleeved on the bearing. The limit plate is slidably fitted on the fixed ring. An installation rod is rotatably connected to one side of the limit seat close to the gear ring. One end of the installation rod away from the limit seat is fixedly connected with a transmission gear, and the transmission gear meshes with the gear ring.

[0005] Preferably, one end of the telescopic rod close to the metal drill bit is fixedly connected with a docking head, and one end of the docking head away from the telescopic rod is fixedly connected with a magnet piece A in an embedded manner.

[0006] Preferably, a docking groove is formed on one side of the metal drill bit close to the telescopic rod. The docking head is located in the docking groove and is slidably connected thereto.

[0007] Preferably, clamping grooves are formed at the top and bottom of the fixing ring. The limiting plates are both located in the clamping grooves on the same side as them. One end of the limiting plate away from the mounting plate is fixedly connected with a magnet piece B in an embedded manner.

[0008] Preferably, a threaded sleeve is rotatably connected to one side of the limiting seat close to the gear ring. A reciprocating lead screw is threadedly connected in the threaded sleeve. One end of the reciprocating lead screw away from the limiting seat is fixedly connected with a mounting frame. A brush body is fixedly connected to one side of the mounting frame close to the gear ring. The brush body contacts the tooth groove wall of the gear ring.

[0009] Preferably, a limiting groove is formed on one side of the limiting seat close to the gear ring. One end of the reciprocating lead screw close to the limiting groove is fixedly connected with a limiting rod. The limiting rod is located in the limiting groove and is slidably connected thereto.

[0010] Preferably, pulley wheels fixedly connected are sleeved on both the threaded sleeve and the mounting rod, and a transmission belt is arranged between the two pulley wheels.

[0011] Preferably, a communication hole is formed on the limiting seat. The shaft rod passes through the limiting seat through the communication hole. The limiting ring, the gear ring and the bearing are all sleeved outside the shaft rod.

[0012] Preferably, a handle is fixedly connected to one side of the transmission gear away from the mounting rod. The handle deviates from the center of the transmission gear, and an anti-slip pad is wrapped on the surface of the handle.

[0013] Preferably, crawlers are arranged at the bottom of the main machine, and a console is fixedly connected to one side of the main machine away from the limiting seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, the shaft rod is fixed by the main machine, and then the transmission gear is rotated 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 of the metal drill bit, it can fall off from the screw rod. When replacing a new metal drill bit, the docking groove of the new metal drill bit is stuck on the docking head, and the new metal drill bit is fixed by the magnet piece A. Then, the thread groove of the new metal drill bit is aligned with the screw rod, and then the transmission gear is rotated in the reverse direction. By using the reversely rotating gear ring and the telescopic rod, the new metal drill bit can be installed on the shaft rod, avoiding the problem that the drill bit temperature is too high when the drill bit has just completed the drilling work, resulting in the inability to replace the drill bit in time and affecting the drilling work efficiency, effectively improving the auxiliary performance of the device for drill bit replacement; When the shaft rod and the drill bit rotate synchronously for drilling work in the present invention, the shaft rod will drive the gear ring to rotate synchronously at this time. During the rotation of the gear ring, it can reversely drive the transmission gear and the mounting rod to rotate. At this time, through the cooperation between the pulley on the mounting rod and the threaded sleeve and the transmission belt, the threaded sleeve is driven to rotate. And at this time, since the reciprocating lead screw is limited by the limiting rod and the limiting groove, the threaded sleeve can drive the reciprocating lead screw to move back and forth during the rotation process. At this time, through the brush body that moves back and forth with the reciprocating lead screw, the dust and impurity particles in the tooth block gap of the gear ring can be cleaned, avoiding the problem that the dust and impurity particles generated during the drilling work adhere between the tooth blocks of the gear ring, resulting in a poor transmission effect between the gear ring and the transmission gear; In the present invention, by fitting the magnet piece A on the docking head, the telescopic rod and the drill bit can be quickly limited. At the same time, due to the telescopic characteristic of the telescopic rod, during the elongation of the shaft rod, the drill bit can drive the telescopic rod to elongate, so that the length of the telescopic rod is always matched with the length of the shaft rod, enabling the telescopic rod to drive the drill bit for transmission work under different lengths of the shaft rod, improving the auxiliary performance of drill bit replacement under different lengths of the shaft rod. Description of the Drawings

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

[0016] In the figure: 1, main machine; 11, crawler; 12, console; 13, limit seat; 14, limit groove; 2, shaft rod; 21, screw rod; 22, metal drill bit; 23, docking groove; 3, telescopic rod; 31, docking head; 32, magnet sheet A; 4, limit ring; 41, gear ring; 42, mounting plate; 43, limit plate; 44, magnet sheet B; 5, bearing; 51, fixing ring; 52, card slot; 6, mounting rod; 61, transmission gear; 62, handle; 7, threaded sleeve; 71, reciprocating screw rod; 72, mounting frame; 73, brush body; 74, limit rod; 8, pulley; 81, transmission belt. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-9 , the present invention provides a technical solution: a coal mine drill rig that is convenient for replacing the drill bit, including a main machine 1. A crawler 11 is provided at the bottom of the main machine 1. A console 12 is fixedly connected to one side of the main machine 1 away from the limit seat 13. A limit seat 13 is provided on one side of the main machine 1. The output end of the main machine 1 near the limit seat 13 is fixedly docked with a shaft rod 2. A screw rod 21 is fixedly connected to the end of the shaft rod 2 away from the main machine 1. A metal drill bit 22 is threadedly connected to the screw rod 21. Multiple metal bumps are provided at the end of the metal drill bit 22 away from the screw rod 21. Through these metal bumps, the drilling effect of the metal drill bit 22 on the rock formation in the coal mine area can be improved. A communication hole is opened on the limit seat 13, and the shaft rod 2 passes through the limit seat 13 through the communication hole.

[0019] Further, the main machine 1 is the main structure of the driving mechanism. It provides drilling with the power head, provides the feeding force with the drilling oil cylinder driving the chain to drive the power head, and adjusts the drilling azimuth with the luffing mechanism. During the operation, the staff can control the drill through the console 12, including moving the drill with the crawler 11 and controlling the main machine 1 to complete the drilling work. By setting the limit seat 13, it can cooperate with the main machine 1 to support the shaft rod 2 at multiple points, improving the stability of the shaft rod 2 during drilling work.

[0020] Combined with the attached Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8As shown, a telescopic rod 3 is slidably connected to one side of the metal drill bit 22 close to the limit seat 13. One end of the telescopic rod 3 close to the metal drill bit 22 is fixedly connected to a docking head 31. One end of the docking head 31 away from the telescopic rod 3 is fixedly connected with a magnet sheet A32 in an embedded manner. A docking groove 23 is opened on one side of the metal drill bit 22 close to the telescopic rod 3. The docking head 31 is located in the docking groove 23 and is slidably connected thereto. One end of the telescopic rod 3 away from the metal drill bit 22 is fixedly connected with a limit ring 4. A toothed ring 41 is fixedly connected to one side of the limit ring 4 close to the metal drill bit 22. Installation plates 42 are rotatably connected to the top and bottom of the limit ring 4. A limit plate 43 is fixedly connected to the installation plate 42. A bearing 5 is rotatably connected to one side of the limit seat 13 close to the metal drill bit 22. A fixing ring 51 is sleeved on the bearing 5. The limit plate 43 is slidably embedded in the fixing ring 51. An installation rod 6 is rotatably connected to one side of the limit seat 13 close to the toothed ring 41. One end of the installation rod 6 away from the limit seat 13 is fixedly connected with a transmission gear 61. The transmission gear 61 meshes with the toothed ring 41. Slots 52 are opened on the top and bottom of the fixing ring 51. The limit plates 43 are all located in the slots 52 on the same side as them. One end of the limit plate 43 away from the installation plate 42 is fixedly connected with a magnet sheet B44 in an embedded manner. When assembling the limit ring 4, first sleeve the limit ring 4 on the shaft rod 2, then connect the end of the shaft rod 2 away from the screw rod 21 to the main machine 1. Then move the limit ring 4 to make it close to the bearing 5, and rotate the installation plate 42 to make the limit plate 43 stuck in the slot 52 of the fixing ring 51, and use the magnet sheet B44 to adsorb the fixing ring 51 to complete the connection work between the limit ring 4 and the bearing 5. Since the inner ring and the outer ring of the bearing 5 are separate movable components, during the rotation of the limit ring 4, the friction between the limit ring 4 and the limit seat 13 can be reduced through the bearing 5, so that when the shaft rod 2 rotates at a high speed, the limit ring 4 and the toothed ring 41 can still rotate synchronously with the shaft rod 2. Due to the connection method between the limit ring 4 and the bearing 5, the connection is made by magnetic attraction and clamping, so that when disassembling the limit ring 4, it is relatively simple and fast. The telescopic rod 3 is also connected to the metal drill bit 22 by magnetic attraction and clamping through the docking head 31 and the magnet sheet A32, so that the metal drill bit 22 can be quickly disassembled from the telescopic rod 3 without affecting the mutual transmission between the telescopic rod 3 and the metal drill bit 22, further improving the efficiency of replacing the metal drill bit 22. One side of the transmission gear 61 away from the installation rod 6 is fixedly connected with a handle 62. The handle 62 deviates from the center of the transmission gear 61. The surface of the handle 62 is wrapped with an anti-slip pad. The limit ring 4, the toothed ring 41 and the bearing 5 are all sleeved outside the shaft rod 2. A damping layer is provided between the inner wall of the limit ring 4 and the outer surface of the shaft rod 2, so that during the rotation of the shaft rod 2, the limit ring 4 can be driven to rotate, and when the shaft rod 2 is fixedly limited, the limit ring 4 and the toothed ring 41 can rotate freely.This makes 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 turned off, and the locking structure of the main unit 1 is used to limit and fix the shaft 2. At this time, the staff holds the handle 62 to drive the transmission gear 61 to rotate. During the rotation of the transmission gear 61, the gear ring 41 and the limiting ring 4 can be driven to rotate. During the rotation of the gear ring 41, the metal drill bit 22 can be driven to rotate by the telescopic rod 3 alone. At this time, during the rotation of the metal drill bit 22, it will move along the screw 21 and fall off, and the metal drill bit 22 will move along the screw 21 and fall off. During the process of moving and falling off, the distance between the metal drill bit 22 and the gear ring 41 will increase, and the metal drill bit 22 will drive the telescopic rod 3 to extend, so that the metal drill bit 22 can smoothly fall off from the screw rod 21, and because the magnet sheet A32 on the docking joint 31 continues to adsorb the metal drill bit 22, it can be ensured that the metal drill bit 22 will not fall directly on the ground when it falls off from the screw rod 21. Then, the metal drill bit 22 is removed from the docking joint 31, and the docking groove 23 of the new metal drill bit 22 is stuck on the docking joint 31. When the new metal drill bit 22 is adsorbed by the magnet sheet A32, the thread groove of the metal drill bit 22 will automatically align with the screw 21 on the shaft 2, and then the new metal drill bit 22 is pushed to make its thread groove stuck in the end of the screw 21. Then the staff reversely rotates the transmission gear 61. At this time, the transmission gear 61 drives the metal drill bit 22 to be screwed into the screw 21. In the process of the metal drill bit 22 being screwed into 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. When the installation is completed , the drilling work can be continued. During the drilling process, if the main machine 1 drives the shaft 2 to extend, 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, avoiding the problem that the extension length of the shaft 2 is affected by the length of the telescopic rod 3, thereby affecting the drilling depth. Through the setting of the bearing 5, the friction between the limit ring 4 and the gear ring 41 and the limit seat 13 can be reduced, so that when the shaft 2 rotates at high speed, the limit ring 4 and the gear ring 41 can still rotate synchronously with the shaft 2.

[0022] Combined with Figure 6 and Figure 9As shown in the figure, a threaded sleeve 7 is rotatably connected to one side of the limit seat 13 close to the gear ring 41. A reciprocating lead screw 71 is connected to the threaded sleeve 7 by internal threads. One end of the reciprocating lead screw 71 away from the limit seat 13 is fixedly connected to a mounting bracket 72. One side of the mounting bracket 72 close to the gear ring 41 is fixedly connected to a brush body 73. The brush body 73 is in contact with the tooth groove wall of the gear ring 41. A limit groove 14 is formed in one side of the limit seat 13 close to the gear ring 41. One end of the reciprocating lead screw 71 close to the limit groove 14 is fixedly connected to a limit rod 74. The limit rod 74 is located in the limit groove 14 and is slidably connected thereto. Fixedly connected pulley wheels 8 are sleeved on both the threaded sleeve 7 and the mounting rod 6. A transmission belt 81 is provided between the two pulley wheels 8.

[0023] Furthermore, during the drilling operation, when the shaft rod 2 rotates, it will drive the limit ring 4 and the gear ring 41 to rotate. At this time, the gear ring 41 will reversely drive the transmission gear 61 and the mounting rod 6 to rotate. At this time, the pulley wheels 8 and the transmission belt 81 on the mounting rod 6 and the threaded sleeve 7 cooperate to drive the threaded sleeve 7 to rotate. At this time, since the reciprocating lead screw 71 is limited by the limit rod 74 and the limit groove 14 and cannot rotate, when the threaded sleeve 7 rotates, it can drive the reciprocating lead screw 71 to move back and forth along the threaded sleeve 7. And during this process, the limit rod 74 is always in the limit groove 14 to continuously limit the reciprocating lead screw 71. At this time, the mounting bracket 72 and the brush body 73 will move synchronously with the reciprocating lead screw 71. The dust and particulate matter between each tooth block and the tooth groove on the gear ring 41 can be cleaned by the reciprocating brush body 73. At the same time, a brush body 73 can be installed on the top of the mounting bracket 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 limit ring 4 and the gear ring 41 are sleeved on the shaft rod 2. Then, the end of the shaft rod 2 away from the screw rod 21 passes through the communication hole of the limit seat 13 and is docked with the main machine 1. Then, the limit ring 4 is moved to make it close to the bearing 5. Then, the mounting plate 42 is rotated so that the limit plate 43 is stuck in the card slot 52 at the corresponding position of the fixed ring 51. At this time, the fixed ring 51 is adsorbed by the magnet sheet B44 to improve the limiting effect on the limit plate 43. At this time, the limit ring 4 can be docked with the outer wall of the bearing 5. After that, the metal drill bit 22 is screwed onto the screw rod 21 of the shaft rod 2, and the docking groove 23 of the metal drill bit 22 is stuck on the docking head 31 of the telescopic rod 3. At this time, the metal drill bit 22 is adsorbed by the magnet sheet A32 to complete the connection work of the metal drill bit 22. After that, the staff can start the main machine 1 through the control console 12, and the main machine 1 drives the shaft 2 to rotate, and the metal drill bit 22 rotates together, so that the rock formation in the coal mine area can be drilled. During the drilling process, if the main machine 1 drives the shaft 2 to extend, 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. 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 drive the drilling rig to move, so that the drilling rig moves to the next drilling point and performs drilling work; When the metal drill bit 22 is worn out due to long-term work and needs to be replaced, the staff can turn off the main unit 1 through the console 12 and use the locking structure of the main unit 1 to limit and fix the shaft 2. At this time, the staff holds the handle 62 to drive the transmission gear 61 to rotate. During the rotation of the transmission gear 61, it can drive the ring gear 41 and the limiting ring 4 to rotate. At this time, during the rotation of the ring gear 41, the metal drill bit 22 can be driven to rotate by the telescopic rod 3 alone. At this time, during the rotation of the metal drill bit 22, it will move along the screw 21 and fall off. During the movement and falling off of the metal drill bit 22 along the screw 21, the distance between the metal drill bit 22 and the ring gear 41 will increase. At this time, the metal drill bit 22 will drive the telescopic rod 3 to extend, so that the metal drill bit 22 can fall off from the screw 21 smoothly, and because of the magnet sheet on the joint 31 at this time. A32 also continues to adsorb the metal drill bit 22 to ensure that the metal drill bit 22 will not fall directly on the ground when it falls off the screw rod 21. Then, the metal drill bit 22 is removed from the docking joint 31, and then the docking groove 23 of the new metal drill bit 22 is stuck on the docking joint 31. At this time, the new metal drill bit 22 is adsorbed by the magnet sheet A32, and the thread groove of the metal drill bit 22 will automatically align with the screw rod 21 on the shaft rod 2. Then, the new metal drill bit 22 is pushed so that its thread groove is stuck on the end of the screw rod 21. Then, the staff member rotates the transmission gear 61 in the opposite direction. At this time, the transmission gear 61 drives the metal drill bit 22 to be screwed into the screw rod 21. In the process of the metal drill bit 22 being screwed into the screw rod 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 shrink. When the installation is completed, the drilling work can continue. When drilling work is carried out, during the rotation of the shaft rod 2, the limit ring 4 and the gear ring 41 will be driven to rotate. At this time, the gear ring 41 will drive the transmission gear 61 and the mounting rod 6 to rotate in the reverse direction. At this time, the belt pulleys 8 on the mounting rod 6 and the threaded sleeve 7 and the transmission belt 81 cooperate to drive the threaded sleeve 7 to rotate. At this time, since the reciprocating lead screw 71 is limited by the limit rod 74 and the limit groove 14 and cannot rotate, during the rotation of the threaded sleeve 7, the reciprocating lead screw 71 can be driven to move back and forth along the threaded sleeve 7. And during this process, the limit rod 74 is always in the limit groove 14 to continuously limit the reciprocating lead screw 71. At this time, the mounting frame 72 and the brush body 73 will move synchronously with the reciprocating lead screw 71. The dust and particles between the tooth blocks and tooth grooves on the gear ring 41 can be cleaned by the reciprocating brush body 73.

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

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine drill rig facilitating bit replacement, comprising a main machine (1). A limit seat (13) is arranged on one side of the main machine (1). The output end of the main machine (1) close to the limit seat (13) is fixedly butted with a shaft rod (2). One end of the shaft rod (2) away from the main machine (1) is fixedly connected with a screw rod (21). A metal drill bit (22) is threadedly connected to the screw rod (21), and it is characterized in that: On one side of the metal drill bit (22) close to the limit seat (13), a telescopic rod (3) is slidably connected. One end of the telescopic rod (3) far from the metal drill bit (22) is fixedly connected with a limit ring (4). On one side of the limit ring (4) close to the metal drill bit (22), a toothed ring (41) is fixedly connected. On the top and bottom of the limit ring (4), mounting plates (42) are rotatably connected. On the mounting plate (42), a limit plate (43) is fixedly connected; On one side of the limit seat (13) close to the metal drill bit (22), a bearing (5) is rotatably connected. A fixing ring (51) is sleeved on the bearing (5). The limit plate (43) is slidably fitted on the fixing ring (51). On one side of the limit seat (13) close to the toothed ring (41), a mounting rod (6) is rotatably connected. One end of the mounting rod (6) far from the limit seat (13) is fixedly connected with a transmission gear (61). The transmission gear (61) meshes with the toothed ring (41).

2. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 1, characterized in that: One end of the telescopic rod (3) close to the metal drill bit (22) is fixedly connected with a docking head (31). One end of the docking head (31) far from the telescopic rod (3) is fixedly connected with a magnet piece A (32) by fitting.

3. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 2, wherein: On one side of the metal drill bit (22) close to the telescopic rod (3), a docking groove (23) is opened. The docking head (31) is located in the docking groove (23) and is slidably connected with it.

4. A coal mine drill rig facilitating bit replacement according to claim 1, characterized in that: On the top and bottom of the fixing ring (51), clamping grooves (52) are opened. The limit plates (43) are all located in the clamping grooves (52) on the same side as them. One end of the limit plate (43) far from the mounting plate (42) is fixedly connected with a magnet piece B (44) by fitting.

5. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 1, wherein: On one side of the limit seat (13) close to the toothed ring (41), a threaded sleeve (7) is rotatably connected. A reciprocating lead screw (71) is threadedly connected in the threaded sleeve (7). One end of the reciprocating lead screw (71) far from the limit seat (13) is fixedly connected with a mounting frame (72). On one side of the mounting frame (72) close to the toothed ring (41), a brush body (73) is fixedly connected. The brush body (73) contacts the tooth groove wall of the toothed ring (41).

6. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 5, characterized in that: On one side of the limit seat (13) close to the toothed ring (41), a limit groove (14) is opened. One end of the reciprocating lead screw (71) close to the limit groove (14) is fixedly connected with a limit rod (74). The limit rod (74) is located in the limit groove (14) and is slidably connected with it.

7. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 6, characterized in that: Fixedly connected pulley wheels (8) are sleeved on both the threaded sleeve (7) and the mounting rod (6). A transmission belt (81) is arranged between the two pulley wheels (8).

8. A coal mine drill rig facilitating bit replacement according to claim 1, characterized in that: A communication hole is opened on the limit seat (13). The shaft rod (2) passes through the limit seat (13) through the communication hole. The limit ring (4), the toothed ring (41) and the bearing (5) are all sleeved outside the shaft rod (2).

9. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 1, characterized in that: On one side of the transmission gear (61) far from the mounting rod (6), a handle (62) is fixedly connected. The handle (62) deviates from the center of the transmission gear (61). The surface of the handle (62) is wrapped with an anti-slip pad.

10. The coal mine drill rig for facilitating the replacement of a drill bit according to claim 1, wherein: The bottom of the host (1) is provided with crawlers (11), and a console (12) is fixedly connected to one side of the host (1) away from the limit seat (13).

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