Rotary drilling machine drill bit for coal mine engineering construction

Abstract

The invention discloses a rotary drilling machine drill bit for coal mine engineering construction, and relates to the technical field of rotary drilling machines, the rotary drilling machine drill bit comprises a conveying paddle and a drill bit body, an adjusting structure is arranged between the conveying paddle and the drill bit body, the adjusting structure comprises a first hollow pipe, a second hollow pipe, a first connecting pipe and a second connecting pipe, the first hollow pipe is fixedly connected with the drill bit body, and the second hollow pipe is fixedly connected with the drill bit body. The first hollow pipe is slidably connected with the first connecting pipe through a plurality of first bolt fasteners, the second hollow pipe is slidably connected with the first connecting pipe, the second connecting pipe is fixedly connected with the second hollow pipe, the second connecting pipe is connected with the conveying paddle through a plurality of second bolt fasteners, and a first electric telescopic rod is arranged at the top of the first hollow pipe. According to the rotary drilling machine drill bit for coal mine engineering construction, reaming work can be carried out according to use requirements, and meanwhile, the interior of a hole can be pressed, so that the situation that the hole collapses is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of rotary drilling machines, in particular to a rotary drilling machine drill bit for coal mine engineering construction. Background Art

[0002] The rotary drilling rig plays a vital role in coal mining operations. The drill bit of the rotary drilling rig is very important to the rotary drilling rig. The drill bit can perform drilling work according to the needs of coal mine construction.

[0003] However, traditional drill bits have the risk of hole collapse during the drilling process, which affects the drilling work of the drill bit. In addition, traditional drill bits are subjected to large impact forces during the drilling process and lack a buffering function to protect the drill bit. Therefore, the present invention proposes a rotary drilling rig drill bit for coal mine engineering construction. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotary drilling rig drill bit for coal mine engineering construction, which can effectively solve the technical problems raised in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A rotary drilling machine drill bit for coal mine engineering construction, comprising a transmission paddle and a drill bit body, wherein an adjustment structure is arranged between the transmission paddle and the drill bit body;

[0007] The adjusting structure comprises a hollow tube 1, a hollow tube 2, a connecting tube 1 and a connecting tube 2. The hollow tube 1 is fixedly connected to the drill bit body, and the hollow tube 1 is connected to the connecting tube 1 by a plurality of bolt fasteners 1. The hollow tube 2 is slidably connected to the connecting tube 1, the connecting tube 2 is fixedly connected to the hollow tube 2, and the connecting tube 2 is connected to the transmission paddle by a plurality of bolt fasteners 2. An electric telescopic rod 1 is arranged on the top of the hollow tube 1, and one end of the electric telescopic rod 1 passes through the top of the hollow tube 1 and is fixedly connected to a fixed plate, the bottom of the fixed plate is rotatably connected to four connecting plates 1, and one end of the connecting plate 1 is rotatably connected to a bottom plate 1, the bottom plate 1 is fixedly connected to the bottom plate 2 by a plurality of guide rods, a plurality of earth-breaking cones are fixedly arranged on one side of the bottom plate 2, and the hollow tube 1 is penetrated by the guide rod.

[0008] As a preferred technical solution of the present invention, the adjustment structure also includes an electric telescopic rod 2, which is arranged at the top of the hollow tube 2, and the electric telescopic rod 2 passes through the top of the hollow tube 2 and is fixedly connected to a bottom plate 3, and four groups of connecting parts are rotatably arranged at the bottom of the bottom plate 3, and each group of connecting parts is composed of two connecting plates 2, and a storage rack is rotatably connected between one ends of the two connecting plates 2, and one side of the storage rack is fixedly connected to two fixed tubes, and a movable rod is slidably arranged on the inner side of the fixed tube, and the two ends of the two movable rods are fixedly connected by a fixed plate and an arc plate respectively, and a fixed block is fixedly arranged at the bottom of the fixed plate, and two springs 1 are arranged between the storage rack and the fixed plate.

[0009] As a preferred technical solution of the present invention, the second hollow tube is penetrated by the fixed tube, the fixed plate is penetrated by the movable rod, and the first spring is located at the periphery of the corresponding movable rod.

[0010] As a preferred technical solution of the present invention, the bottom plate three is arranged in a "well" shape, one side of the fixed block is inclined toward the horizontal direction, the inner side of the hollow tube one is cross-shaped, and the bottom plate one and the hollow tube one are adaptively matched.

[0011] As a preferred technical solution of the present invention, a buffer structure is arranged on the inner side of the hollow tube 2 and the connecting tube 1, and the buffer structure includes a plurality of springs 2 and a chassis, the springs 2 are arranged between the bottom of the hollow tube 2 and the inner bottom surface of the connecting tube 1, the chassis is slidably arranged on the inner side of the hollow tube 2, the chassis is fixedly connected to the connecting tube 1 through four limit rods, an electric push rod 1 is arranged on the top of the chassis, a top plate is fixedly arranged at one end of the electric push rod 1, four inclined plates are fixedly arranged at the bottom of the top plate, and a pressure plate is fixedly connected to one end of the inclined plate.

[0012] As a preferred technical solution of the present invention, the second hollow tube is penetrated by a limiting rod, and the pressing plate and the fixing block are adaptively matched.

[0013] As a preferred technical solution of the present invention, the pressing plate is composed of two protrusions and a connecting block.

[0014] As a preferred technical solution of the present invention, a stopping structure is arranged on the outside of the connecting tube 1, and the stopping structure includes two mounting plates, and the mounting plates are fixedly connected to the connecting tube 1. An electric push rod 2 is arranged on the top of the mounting plates, and one end of the electric push rod 2 is fixedly connected to a limiting plate, and the limiting plate is composed of two limiting columns and a horizontal plate.

[0015] As a preferred technical solution of the present invention, four limiting tubes are fixedly provided at the bottom of the hollow tube 2, and the limiting tubes are adaptively matched with the limiting columns of the limiting plate.

[0016] As a preferred technical solution of the present invention, the bolt fastener 1 and the bolt fastener 2 are both composed of bolts and nuts.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting the adjustment structure, it is helpful to adjust the diameter of the drill hole according to the needs, so that the drill bit of the rotary drilling rig can have the function of expanding the hole. At the same time, the drill bit body can cooperate with the soil breaking cone to improve the efficiency of drilling;

[0019] 2. The arc plate is provided in combination with the earth-breaking cone, which is conducive to the rotation and scraping of the irregular inner wall of the hole caused by the drill bit body and the earth-breaking cone, so that the inner wall of the drill hole tends to be regular and the risk of hole collapse is reduced;

[0020] 3. By setting a buffer structure and an adjustment structure, it is helpful to buffer the resistance of the drill body, which can further improve the service life of the drill body. At the same time, under the action of spring 1, spring 2, pressure plate and fixed block, the arc plate can perform intermittent expansion and contraction movements, which is beneficial for the arc plate to rotate and press the inner wall of the drill hole after expansion under the action of the rotary drilling machine, so that the inner wall of the hole is compacted to avoid the collapse of the hole;

[0021] 4. By setting a stop structure in conjunction with a buffer structure, it is beneficial for the drill body to perform resistance buffering or not according to needs. When the electric push rod 2 acts on the limit plate to move up, the distance between the hollow tube 1 and the hollow tube 2 can be kept constant without moving. When the electric push rod 2 acts on the limit plate in the initial state, the distance between the hollow tube 1 and the hollow tube 2 changes continuously under the action of the spring 2 when the drill body is subjected to resistance;

[0022] 5. The setting of the limiting tube in conjunction with the limiting plate is conducive to limiting the position of the connecting tube 1. When the limiting column of the limiting plate is inserted into the inner side of the limiting tube, the drill body loses its buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0024] Figure 2 It is a schematic diagram of the disassembled three-dimensional structure of a transmission paddle and a connecting pipe 2 of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0025] Figure 3 It is a schematic diagram of the split three-dimensional structure of a connecting pipe 1 and a hollow pipe 1 of a rotary drilling rig drill bit for coal mine engineering construction of the present invention;

[0026] Figure 4It is a schematic diagram of the cross-sectional three-dimensional structure of a hollow tube 2 of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of a fixing pipe of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0028] Figure 6 It is a schematic diagram of the split three-dimensional structure of the hollow tube 2 and the connecting tube 1 of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0029] Figure 7 It is a three-dimensional structural schematic diagram of an electric push rod 2 of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0030] Figure 8 It is a schematic diagram of the overall cross-section of a rotary drilling rig drill bit for coal mine engineering construction according to the present invention;

[0031] Fig. 9 It is a schematic diagram of the overall cross-section side view of a rotary drilling rig drill bit for coal mine engineering construction of the present invention;

[0032] Fig.10 The present invention is a schematic diagram of the overall side view structure of a rotary drilling rig drill bit for coal mine engineering construction.

[0033] In the figure: 1. transmission paddle; 2. drill bit body; 3. adjustment structure; 4. buffer structure; 5. stop structure; 6. hollow tube 1; 7. hollow tube 2; 8. connecting tube 1; 9. bolt fastener 1; 10. connecting tube 2; 11. bolt fastener 2; 12. electric telescopic rod 1; 13. fixing plate; 14. connecting plate 1; 15. bottom plate 1; 16. guide rod; 17. bottom plate 2; 18. earth-breaking cone; 19. electric telescopic rod Rod 2; 20, bottom plate 3; 21, connecting plate 2; 22, storage rack; 23, fixed tube; 24, movable rod; 25, fixed plate; 26, arc plate; 27, fixed block; 28, spring 1; 29, spring 2; 30, chassis; 31, limit rod; 32, electric push rod 1; 33, top plate; 34, inclined plate; 35, pressure plate; 36, mounting plate; 37, limit tube; 38, electric push rod 2; 39, limit plate. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figure 1-Figure 10 As shown, a rotary drilling machine drill bit for coal mine engineering construction includes a transmission paddle 1 and a drill bit body 2, and an adjustment structure 3 is arranged between the transmission paddle 1 and the drill bit body 2;

[0036] The adjusting structure 3 includes a hollow tube 16, a hollow tube 27, a connecting tube 18, and a connecting tube 210. The hollow tube 16 is fixedly connected to the drill body 2, and the hollow tube 16 is connected to the connecting tube 18 through a plurality of bolt fasteners 19. The hollow tube 27 is slidably connected to the connecting tube 18. The connecting tube 210 is fixedly connected to the hollow tube 27, and the connecting tube 210 is connected to the conveying paddle 1 through a plurality of bolt fasteners 211. An electric telescopic rod 12 is provided on the top of the hollow tube 6, and one end of the electric telescopic rod 12 passes through the top of the hollow tube 6 and is fixedly connected to a fixed plate 13. The bottom of the fixed plate 13 is rotatably connected to four connecting plates 14, and one end of the connecting plate 14 is rotatably connected to a bottom plate 15. The bottom plate 15 is fixedly connected to the bottom plate 217 through a plurality of guide rods 16. A plurality of earth-breaking cones 18 are fixedly provided on one side of the bottom plate 217, and the hollow tube 6 is penetrated by the guide rod 16.

[0037] The adjustment structure 3 can adjust the diameter of the drill hole as needed, so that the drill bit of the rotary drilling rig can have the function of expanding the hole. At the same time, the drill bit body 2 cooperates with the earth-breaking cone 18 to improve the efficiency of drilling.

[0038] In this embodiment, the adjustment structure 3 also includes an electric telescopic rod 2 19, which is arranged at the top of the hollow tube 2 7. The electric telescopic rod 2 19 passes through the top of the hollow tube 2 7 and is fixedly connected to a bottom plate 3 20. Four groups of connecting parts are rotatably arranged at the bottom of the bottom plate 3 20, and each group of connecting parts is composed of two connecting plates 21. A storage rack 22 is rotatably connected between one ends of the two connecting plates 21. Two fixed tubes 23 are fixedly connected to one side of the storage rack 22. A movable rod 24 is slidably arranged on the inner side of the fixed tube 23. The two ends of the two movable rods 24 are fixedly connected by a fixed plate 25 and an arc plate 26 respectively. A fixed block 27 is fixedly arranged at the bottom of the fixed plate 25, and two springs 28 are arranged between the storage rack 22 and the fixed plate 25.

[0039] The arc plate 26 cooperates with the breaking cone 18 to rotate and scrape the irregular inner wall of the hole caused by the drill body 2 and the breaking cone 18, so that the inner wall of the drill hole tends to be regular and the risk of hole collapse is reduced.

[0040] In this embodiment, the second hollow tube 7 is penetrated by the fixed tube 23 , the fixed plate 25 is penetrated by the movable rod 24 , and the first spring 28 is located at the periphery of the corresponding movable rod 24 .

[0041] The spring 1 28 provides elastic support to the fixing plate 25 .

[0042] In this embodiment, the bottom plate 3 20 is arranged in a "well" shape, one side of the fixed block 27 is inclined toward the horizontal direction, the inner side of the hollow tube 1 6 is cross-shaped, and the bottom plate 15 and the hollow tube 1 6 are adaptively matched.

[0043] The bottom plate 15 slides inside the hollow tube 6 under the action of the electric telescopic rod 12.

[0044] In this embodiment, a buffer structure 4 is provided on the inner side of the hollow tube 27 and the connecting tube 18. The buffer structure 4 includes a plurality of springs 29 and a chassis 30. The spring 29 is provided between the bottom of the hollow tube 27 and the inner bottom surface of the connecting tube 18. The chassis 30 is slidably provided on the inner side of the hollow tube 27. The chassis 30 is fixedly connected to the connecting tube 18 through four limit rods 31. An electric push rod 132 is provided on the top of the chassis 30. A top plate 33 is fixedly provided at one end of the electric push rod 132. Four inclined plates 34 are fixedly provided at the bottom of the top plate 33. A pressure plate 35 is fixedly connected to one end of the inclined plate 34.

[0045] The buffer structure 4 cooperates with the adjustment structure 3 to buffer the resistance exerted on the drill body 2, which can further improve the service life of the drill body 2. At the same time, under the action of spring 1 28, spring 29, pressure plate 35, and fixed block 27, the arc plate 26 can perform intermittent expansion and contraction movements, which is beneficial for the arc plate 26 to rotate and press the inner wall of the borehole after expansion under the action of the rotary drilling machine, so that the inner wall of the hole is compacted to avoid the collapse of the hole.

[0046] In this embodiment, the hollow tube 2 7 is penetrated by the limiting rod 31 , and the pressing plate 35 and the fixing block 27 are adaptively matched.

[0047] The pressing plate 35 moves up and down and cooperates with the spring 1 28 to act on the fixed block 27 to repeatedly move horizontally left and right.

[0048] In this embodiment, the pressing plate 35 is composed of two protruding blocks and a connecting block.

[0049] The projections of the pressing plate 35 are in contact with the surface of the fixing block 27 in the initial state.

[0050] In this embodiment, a stopping structure 5 is provided on the outside of the connecting tube 8, and the stopping structure 5 includes two mounting plates 36. The mounting plates 36 and the connecting tube 8 are fixedly connected. An electric push rod 2 38 is provided on the top of the mounting plate 36. One end of the electric push rod 2 38 is fixedly connected to a limiting plate 39, and the limiting plate 39 is composed of two limiting columns and a horizontal plate.

[0051] The stop structure 5 cooperates with the buffer structure 4 so that the drill body 2 can perform resistance buffering or not as needed. When the electric push rod 2 38 acts on the limit plate 39 to move upward, the distance between the hollow tube 1 6 and the hollow tube 2 7 can be kept constant without moving. When the electric push rod 2 38 acts on the limit plate 39 and is in the initial state, when the drill body 2 is subjected to resistance, the distance between the hollow tube 1 6 and the hollow tube 2 7 changes continuously under the action of the spring 2 29.

[0052] In this embodiment, four limiting tubes 37 are fixedly provided at the bottom of the hollow tube 7, and the limiting tubes 37 and the limiting columns of the limiting plate 39 are adaptively matched.

[0053] The limiting tube 37 cooperates with the limiting plate 39 to limit the position of the connecting tube 8. When the limiting column of the limiting plate 39 is inserted into the inner side of the limiting tube 37, the drill body 2 loses its buffering effect.

[0054] In this embodiment, the bolt fastener 1 9 and the bolt fastener 2 11 are both composed of bolts and nuts.

[0055] The bolt fastener 9 serves to connect and fix the connecting pipe 8 and the hollow pipe 6 , and the bolt fastener 2 11 serves to connect and fix the connecting pipe 2 10 and the conveying paddle 1 .

[0056] It should be noted that the present invention is a rotary drilling machine drill bit for coal mine engineering construction. Before use, the transmission paddle 1 and the existing rotary drilling machine are installed, the transmission paddle 1 is installed on the connecting pipe 10 through the bolt fastener 11, and the connecting pipe 8 is installed on the hollow pipe 6 through the bolt fastener 9, so that it can reach the working operating conditions. The initial state is as follows Figure 1 As shown;

[0057] When the rotary drilling machine performs normal drilling work, the rotary drilling machine makes the transmission paddle 1 perpendicular to the ground and the drill bit body 2 contacts the ground, and then the power equipment of the rotary drilling machine makes the transmission paddle 1 rotate and gradually move downward, the drill bit body 2 and the ground-breaking cone 18 rotate the ground to drill holes. In the process, the drill bit body 2 is subjected to resistance and slides the hollow tube 1 6 and the connecting tube 1 8 toward the hollow tube 2 7. The spring 29 is compressed, and the connecting tube 1 8 moves the chassis 30 through the limit rod 31. The chassis 30 acts on the electric push rod 1 32 and the top plate 33 to move synchronously, and finally the pressure plate 35 is pressed toward the fixed block 27. The fixed block 27 moves toward the arc plate 26 with the fixed plate 25 under the action of the pressure plate 35. Since the fixed plate 25 is fixedly connected to the arc plate 26 by the movable rod 24, the arc plate 26 will move with the fixed block 27. When the spring 29 rebounds, the hollow tube 6 moves downward and the pressure plate 35 also moves downward. The spring 28 loses pressure and acts on the fixed plate 25 to rebound the arc plate 26. Under the action of the rotary drilling machine, the drill body 2 continues to penetrate the ground to perform rotary drilling. Under the action of the force, the spring 29 is continuously compressed and rebounded to buffer the drill body 2. At the same time, the pressure plate 35 continuously acts on the fixed block 27. The fixed plate 25, under the action of the spring 28, causes the arc plate 26 to expand and contract differently. In the process of continuous expansion and contraction, the arc plate 26 rotates and presses the inner wall of the hole formed by the drill body 2 and the earth-breaking cone 18, so that the inner wall is compacted under the pressure of the arc plate 26 to avoid collapse. Finally, the generated soil is transmitted out of the hole through the transmission paddle 1.

[0058] When the rotary drilling machine is expanding the hole, the electric telescopic rod 12 is started to act on the fixed plate 13 to move down to the predetermined position and then stop. During the process, the fixed plate 13 acts on the bottom plate 15 through the connecting plate 14 to move toward the outside of the hollow tube 6. The bottom plate 15 acts on the bottom plate 2 17 and the earth-breaking cone 18 through the guide rod 16 to move synchronously until the earth-breaking cone 18 moves to the predetermined position. At this time, the electric push rod 132 is started to move the pressure plate 35 downward, so that the pressure plate 35 releases the position restriction on the fixed block 27, and then the electric telescopic rod 219 is started to act on the bottom plate 3 20 to move down to the predetermined position and then stop. During the process, the bottom plate 3 20 acts on the storage rack 22 through the connecting plate 21 to move toward the outside of the hollow tube 27. The rack 22 moves in the upper direction, and the rack 22 acts on the arc plate 26 through the fixed tube 23 to move synchronously. At this time, the position of the arc plate 26 and the earth-breaking cone 18 match each other. The previous transmission paddle 1 is removed and the transmission paddle 1 that matches the position of the earth-breaking cone 18 is installed. Then the pressure plate 35 is moved up to the position matching the fixed block 27 through the electric push rod 32. At this time, the transmission paddle 1 is acted on by the rotary drilling machine to rotate and move downward. During the process, the drill body 2 and the earth-breaking cone 18 are rotated and drilled as described above. Similarly, during the drilling process, the drill body 2 is pressure-buffered. At the same time, the inner wall of the hole is rotated and pressed by the arc plate 26. Finally, the generated soil is transmitted out of the hole through the transmission paddle 1;

[0059] In addition, when the drill body 2 is not needed for pressure buffering, the electric push rod 2 38 is started to act on the limit plate 39 to move toward the limit tube 37 until the limit column of the limit plate 39 is inserted into the inner side of the limit tube 37 and stops. At this time, the drill body 2 will not act on the hollow tube 1 6 to move toward the hollow tube 2 7 when encountering resistance, and the expansion work of the arc plate 26 is also prohibited.

Claims

1. A rotary drilling rig drill bit for coal mine engineering construction, comprising a transmission paddle (1) and a drill bit body (2), characterized in that: An adjustment structure (3) is provided between the transmission paddle (1) and the drill body (2); The adjusting structure (3) comprises a hollow tube 1 (6), a hollow tube 2 (7), a connecting tube 1 (8), and a connecting tube 2 (10); the hollow tube 1 (6) is fixedly connected to the drill bit body (2), and the hollow tube 1 (6) is connected to the connecting tube 1 (8) via a plurality of bolt fasteners 1 (9); the hollow tube 2 (7) is slidably connected to the connecting tube 1 (8); the connecting tube 2 (10) is fixedly connected to the hollow tube 2 (7), and the connecting tube 2 (10) is connected to the transmission paddle (1) via a plurality of bolt fasteners 2 (11); An electric telescopic rod (12) is arranged at the top, and one end of the electric telescopic rod (12) passes through the top of the hollow tube (6) and is fixedly connected to a fixed plate (13). The bottom of the fixed plate (13) is rotatably connected to four connecting plates (14), and one end of the connecting plate (14) is rotatably connected to a bottom plate (15). The bottom plate (15) is fixedly connected to a bottom plate (17) through a plurality of guide rods (16). A plurality of earth-breaking cones (18) are fixedly arranged on one side of the bottom plate (17), and the hollow tube (6) is penetrated by the guide rod (16).

2. The rotary drilling rig drill bit for coal mine engineering construction according to claim 1, characterized in that: The adjustment structure (3) further comprises an electric telescopic rod (19), the electric telescopic rod (19) being arranged at the top of the hollow tube (7), the electric telescopic rod (19) passing through the top of the hollow tube (7) and being fixedly connected to a bottom plate (20), the bottom of the bottom plate (20) being rotatably provided with four groups of connecting parts, each group of connecting parts being composed of two connecting plates (21), a storage rack (22) being rotatably connected between one end of the two connecting plates (21), one side of the storage rack (22) being fixedly connected with two fixed tubes (23), the inner side of the fixed tube (23) being slidably provided with a movable rod (24), the two ends of the two movable rods (24) being fixedly connected respectively by a fixed plate (25) and an arc plate (26), the bottom of the fixed plate (25) being fixedly provided with a fixed block (27), and two springs (28) being provided between the storage rack (22) and the fixed plate (25).

3. The rotary drilling rig drill bit for coal mine engineering construction according to claim 2, characterized in that: The second hollow tube (7) is penetrated by the fixed tube (23), the fixed plate (25) is penetrated by the movable rod (24), and the first spring (28) is located at the periphery of the corresponding movable rod (24).

4. The rotary drilling rig drill bit for coal mine engineering construction according to claim 2, characterized in that: The bottom plate three (20) is arranged in a "well" shape, one side of the fixing block (27) is arranged to be inclined in the horizontal direction, the inner side of the hollow tube one (6) is in a cross shape, and the bottom plate one (15) and the hollow tube one (6) are adaptively matched.

5. The rotary drilling rig drill bit for coal mine engineering construction according to claim 2, characterized in that: A buffer structure (4) is arranged on the inner side of the hollow tube 2 (7) and the connecting tube 1 (8), and the buffer structure (4) comprises a plurality of springs 2 (29) and a chassis (30). The springs 2 (29) are arranged between the bottom of the hollow tube 2 (7) and the inner bottom surface of the connecting tube 1 (8). The chassis (30) is slidably arranged on the inner side of the hollow tube 2 (7). The chassis (30) is fixedly connected to the connecting tube 1 (8) through four limit rods (31). An electric push rod 1 (32) is arranged on the top of the chassis (30), and a top plate (33) is fixedly arranged at one end of the electric push rod 1 (32). Four inclined plates (34) are fixedly arranged at the bottom of the top plate (33), and a pressure plate (35) is fixedly connected to one end of the inclined plate (34).

6. The rotary drilling rig drill bit for coal mine engineering construction according to claim 5, characterized in that: The second hollow tube (7) is penetrated by a limiting rod (31), and the pressing plate (35) and the fixing block (27) are adaptively matched.

7. The rotary drilling rig drill bit for coal mine engineering construction according to claim 5, characterized in that: The pressing plate (35) consists of two protrusions and a connecting block.

8. The rotary drilling rig drill bit for coal mine engineering construction according to claim 1, characterized in that: A stop structure (5) is arranged outside the connecting pipe (8), and the stop structure (5) comprises two mounting plates (36). The mounting plates (36) and the connecting pipe (8) are fixedly connected. An electric push rod (38) is arranged on the top of the mounting plates (36), and one end of the electric push rod (38) is fixedly connected to a limiting plate (39), and the limiting plate (39) is composed of two limiting columns and a horizontal plate.

9. The rotary drilling rig drill bit for coal mine engineering construction according to claim 8, characterized in that: Four limiting tubes (37) are fixedly arranged at the bottom of the second hollow tube (7), and the limiting tubes (37) are adaptively matched with the limiting columns of the limiting plate (39).

10. The rotary drilling rig drill bit for coal mine engineering construction according to claim 1, characterized in that: The bolt fastener 1 (9) and the bolt fastener 2 (11) are both composed of bolts and nuts.

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