Rock drill for coal mining

Abstract

The invention relates to the technical field of rock drills, in particular to a rock drill for coal mining, which comprises a drill body, an air connecting pipe is mounted on the outer wall of the drill body, an upper air inlet valve is connected to the middle of the air connecting pipe, a lower air inlet valve is connected to the bottom end of the air connecting pipe, and a limiting cylinder is mounted at the upper end of the inner side of the drill body. A piston rod is mounted on the inner side of the limiting cylinder, and a piston disc is mounted in the middle of the piston rod; a rock drilling structure is installed on the inner side of the top of the machine body and comprises a connecting block, the connecting block is fixedly connected to the bottom end of a piston rod, and the bottom end of the connecting block is fixedly connected with a connecting rod. According to the rock drill, by arranging the supporting barrel capable of moving on the outer side of the drill bit body, when the drill bit body is clamped in the rock and cannot be retracted into the machine body, the supporting barrel can stretch out and support the outer side of the rock clamping the drill bit body, upward force is applied to the machine body to assist the drill bit body to be separated from the rock, manpower is saved, and the use experience of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rock drills, and specifically to a rock drill for coal mine excavation. Background Technique

[0002] A pneumatic rock drill is a working tool for rock drilling and hole boring during mine exploitation and tunnel tunneling. Its working principle is that compressed air is used as the power to push the piston to reciprocate and strike the impact rod reciprocally, so as to use the impact rod to impact the rock or concrete block to make it break.

[0003] In this regard, Chinese Patent Application No.: CN202410241562.9 discloses a portable pneumatic rock drill, belonging to the field of pneumatic rock drills, including an outer sleeve tube 1. The inside of the outer sleeve tube 1 is of a hollow structure and the lower end is open. A rock drilling assembly is arranged on the lower side of the outer sleeve tube 1. The rock drilling assembly includes an outer sleeve tube 2 fixedly connected to the lower end of the outer sleeve tube 1. An impact assembly is arranged inside the outer sleeve tube 2. The impact assembly includes a movable seat fixedly connected to the inner surface of the outer sleeve tube 2. The movable seat is in a circular ring shape. It can be realized that by setting a material discharging assembly, the rock debris around the drill bit can be blown and cleaned by the ejected gas, so that the residue of the rock debris around the drill bit can be greatly reduced, the probability of the drill bit being stuck is effectively reduced, and further the stability and reliability during the working process of the rock drill are greatly improved. At the same time, the gas blowing on the surface of the drill bit can cool the drill bit by air cooling, so that the service life of the drill bit can be effectively extended.

[0004] This rock drill can reduce the vibration during the use of the rock drill by setting a buffer assembly. However, when the existing rock drill is in use, the drill bit often gets stuck in the rock and cannot be disengaged. Workers need to shake the rock drill in the vertical direction of the drill bit to push the surrounding rock through the drill bit, so as to create a gap between the drill bit and the rock before the drill bit can be pulled out of the rock. This is quite laborious and easily bends the drill bit, affecting the use experience of the device.

[0005] Therefore, in order to solve the above problems, a rock drill for coal mine excavation is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a rock drill for coal mine excavation to solve the problem that in the prior art, although the rock drill can reduce the vibration during use by setting a buffer assembly, when the existing rock drill is in use, the drill bit often gets stuck in the rock and cannot be disengaged. Workers need to shake the rock drill in the vertical direction of the drill bit to push the surrounding rock through the drill bit, so as to create a gap between the drill bit and the rock before the drill bit can be pulled out of the rock. This is quite laborious and easily bends the drill bit, affecting the use experience of the device.

[0007] To achieve the above object, the present invention provides the following technical solution: A rock drill for coal mine excavation, comprising: a fuselage, an air intake pipe is installed on the outer wall of the fuselage, an upper air intake valve is connected to the middle of the air intake pipe, a lower air intake valve is connected to the bottom end of the air intake pipe, a limiting cylinder is installed at the upper end inside the fuselage, a piston rod is installed inside the limiting cylinder, and a piston disk is installed in the middle of the piston rod;

[0008] A rock drilling structure is installed on the inner top of the fuselage. The rock drilling structure includes a connecting block, the connecting block is fixedly connected to the bottom end of the piston rod, a connecting rod is fixedly connected to the bottom end of the connecting block, a movable cavity is opened at the bottom of the connecting rod, a cross groove is opened on the top surface of the movable cavity, movable grooves are opened on the side walls of the cross groove, a movable block is movably installed inside the movable cavity, a first spring is fixedly connected to the bottom surface of the movable block, the bottom end of the first spring is fixedly connected to a drill bit body, and a second spring is fixedly connected to the inner wall of the movable cavity;

[0009] A pulling-out structure is installed on the outside of the rock drilling structure. The pulling-out structure includes a support cylinder, the support cylinder is sleeved on the outside of the drill bit body, a limiting block is integrally formed on the outer wall of the support cylinder, a connecting disk is sleeved on the outside of the connecting rod, a pulling rope is fixedly connected to the bottom surface of the connecting disk, a roller is movably installed on the inner wall of the fuselage through a bearing, a movable column is movably installed inside the cross groove, a cross block is integrally formed on the outer wall of the movable column, a pushing block is slidably installed inside the movable groove, a friction block is fixedly connected to one side wall of the pushing block, a wedge groove is opened on the other side wall of the pushing block, a third spring is fixedly connected to the surface of the pushing block, and a fourth spring is fixedly connected to the bottom surface of the connecting disk.

[0010] Preferably, the output ends of the upper air intake valve and the lower air intake valve are respectively located on the upper and lower sides of the piston disk, and the piston disk is adapted to the inner wall of the fuselage.

[0011] Preferably, the movable block is located at the upper end inside the movable cavity, the bottom end of the drill bit body exposes the bottom surface of the fuselage, one end of the second spring is fixedly connected to the bottom surface of the movable block, and the second spring is sleeved on the outside of the first spring.

[0012] Preferably, the support cylinder is slidably installed inside the fuselage through the limiting block, the bottom end of the support cylinder is located above the bottom end of the drill bit body, and the connecting disk is located outside the movable groove.

[0013] Preferably, the middle of the pulling rope is wound around the outside of the roller, the pulling rope is in a "U" shape structure, and one end of the pulling rope is fixedly connected to the upper end of the support cylinder.

[0014] Preferably, the movable column is fixedly connected to the top surface of the movable block, the cross block is slidably installed inside the cross groove, and the bottom end of the cross block is inclined and fits with the inner wall of the wedge groove.

[0015] Preferably, the pushing block is installed on the outside of the movable column, the outer wall of the friction block is flush with the outer wall of the connecting rod and does not contact the inner wall of the connecting plate, one end of the third spring is fixedly connected to the inner wall of the movable groove, and one end of the fourth spring is fixedly connected to the inner wall of the fuselage.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the rock drill of the present invention is provided with a support cylinder that can move outside the drill bit body. When the drill bit body is stuck in the rock and cannot be retracted into the fuselage, it can be extended and supported on the outside of the rock that jams the drill bit body, giving the fuselage an upward force to assist the drill bit body to be separated from the rock, thereby saving manpower and improving the user experience of the device.

[0017] A rock drilling structure and a pulling structure are provided, and the input end of the air pipe is connected to the air source, and the gas enters the upper side of the piston disc through the upper air inlet valve, and the gas pushes the piston disc to move downward, and the piston disc drives the piston rod to descend, and the piston rod drives the drill bit body to move downward through the connecting block, the connecting rod, the movable block and the first spring. Then the gas enters the lower side of the piston disc through the lower air inlet valve, and the gas pushes the piston disc to move upward, and the piston disc drives the piston rod to rise, and the piston rod drives the drill bit body to move upward through the connecting block, the connecting rod, the movable block and the first spring. At this time, the movable block is fixed at the upper end of the inner side of the movable cavity under the elastic action of the first spring, and the cross block cannot push the push block, so the push block is separated from the connecting disc. At this time, the connecting disc is fixed in place, and the gas is quickly switched by controlling the flow of the upper air inlet valve and the lower air inlet valve, so that the piston disc can perform high-frequency reciprocating motion, so that the rock can be impacted and excavated through the drill bit body;

[0018] When the drill bit body extends and gets stuck by the rock, the piston rod and the piston disc move upward under the action of the gas. The piston rod pulls the connecting rod upward through the connecting block, while the drill bit body at the bottom end of the connecting rod cannot follow the movement. At the same time, the movable column, the movable block and the first spring are all fixed on the drill bit body. Therefore, the connecting rod will move relative to the drill bit body, the first spring, the movable block and the movable column. The movable block will move downward inside the movable cavity, and the movable block will cooperate with the movable cavity to squeeze the second spring. At the same time, the movable column drives the cross block to slide downward inside the cross groove. The cross block fits the wedge groove. As the movable column moves, the cross block will push the push block, causing the push block to slide inside the movable groove and squeeze the third spring. The push block will drive the friction block to extend from the outer wall of the connecting rod. The friction block will fit against the inner wall of the connecting disc outward, so that the connecting disc is fixed on the outside of the connecting rod. At this time, a whole is formed among the connecting rod, the connecting disc, the cross block, the movable column, the push block and the friction block. Therefore, when the connecting rod rises, it can also generate an upward pulling force on the drill bit body, and the connecting disc will rise together with the connecting rod. The movement of the connecting disc will pull the fourth spring to generate elastic deformation. The connecting disc will pull one end of the pull rope, causing the support cylinder connected to the other end of the pull rope to move downward. The support cylinder will move downward outside the drill bit body. The bottom end of the support cylinder can support on the outside of the rock excavation area and react on the fuselage, causing the fuselage to move upward. The fuselage can generate an upward pulling force on the drill bit body to assist the drill bit body to break away from the rock, thereby saving manpower, improving the use experience, and preventing the fuselage from being damaged due to the drill bit body getting stuck and the impact of the rock drill on the rock under the action of the piston disc movement;

[0019] After the drill bit body breaks away from the rock, the drill bit body will reset under the elastic action of the second spring. The movable block will reset inside the movable cavity. The movable column and the cross block will slide upward and reset inside the cross groove. The cross block will release the abutment against the wedge groove. The push block will reset under the elastic action of the third spring and release the abutment against the connecting disc. The connecting disc will reset under the elastic action of the fourth spring. The connecting disc will pull the pull rope, causing the support cylinder to retract into the fuselage to prepare for the next rock excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the present invention;

[0021] Figure 2 It is a front view sectional structural schematic diagram of the fuselage of the present invention;

[0022] Figure 3 It is a bottom view structural schematic diagram of the rock drilling structure and the pulling out structure of the present invention;

[0023] Figure 4 It is a front view sectional structural schematic diagram of the connecting rod of the present invention;

[0024] Figure 5 Explosion schematic diagram of the front view cross-section structure of the connection plate of the present invention;

[0025] Figure 6 Front view schematic diagram of the structures of the support cylinder and the limit block of the present invention;

[0026] Figure 7 Explosion schematic diagram of the front view cross-section structure of the connecting rod of the present invention;

[0027] Figure 8 Side view schematic diagram of the structure of the pushing block of the present invention.

[0028] In the figure: 1, fuselage; 11, air intake pipe; 12, upper air intake valve; 13, lower air intake valve; 14, limit cylinder; 15, piston rod; 16, piston disc; 2, rock drilling structure; 21, connecting block; 22, connecting rod; 23, cross groove; 24, movable groove; 25, movable cavity; 26, movable block; 27, first spring; 28, drill bit body; 29, second spring; 3, pulling-out structure; 31, support cylinder; 32, limit block; 33, connection plate; 34, pull rope; 35, roller; 36, movable column; 37, cross block; 38, pushing block; 39, friction block; 310, wedge groove; 311, third spring; 312, fourth spring. Detailed implementation manners

[0029] 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 creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1-8 , an embodiment provided by the present invention:

[0031] The fuselage 1, air intake pipe 11, upper air intake valve 12, lower air intake valve 13, limit cylinder 14, piston rod 15, piston disc 16 and drill bit body 28 used in the present application are products that can be directly purchased on the market, and their principles and connection methods are all prior arts well-known to those skilled in the art, so they will not be elaborated herein.

[0032] A rock drill for coal mine excavation includes: a fuselage 1, an air intake pipe 11 is installed on the outer wall of the fuselage 1, an upper air intake valve 12 is connected to the middle of the air intake pipe 11, a lower air intake valve 13 is connected to the bottom end of the air intake pipe 11, a limit cylinder 14 is installed at the upper inner side of the fuselage 1, a piston rod 15 is installed inside the limit cylinder 14, and a piston disc 16 is installed in the middle of the piston rod 15;

[0033] A rock drilling structure 2 is installed on the top inner side of the fuselage 1. The rock drilling structure 2 includes a connecting block 21. The connecting block 21 is fixedly connected to the bottom end of the piston rod 15. A connecting rod 22 is fixedly connected to the bottom end of the connecting block 21. A movable cavity 25 is provided at the bottom of the connecting rod 22. A cross groove 23 is provided on the top surface of the movable cavity 25. A movable groove 24 is provided on the side wall of the cross groove 23. A movable block 26 is movably installed inside the movable cavity 25. A first spring 27 is fixedly connected to the bottom surface of the movable block 26. A drill head body 28 is fixedly connected to the bottom end of the first spring 27. A second spring 29 is fixedly connected to the inner wall of the movable cavity 25.

[0034] A pull-out structure 3 is installed on the outer side of the rock drilling structure 2, and the pull-out structure 3 includes a support tube 31, which is sleeved on the outer side of the drill bit body 28, and a limited position block 32 is integrally formed on the outer wall of the support tube 31. A connecting disk 33 is sleeved on the outer side of the connecting rod 22, and a pull rope 34 is fixedly connected to the bottom surface of the connecting disk 33. A roller 35 is movably installed on the inner wall of the fuselage 1 through a bearing, and a movable column 36 is movably installed on the inner side of the cross groove 23. A cross block 37 is integrally formed on the outer wall of the movable column 36, and a push block 38 is slidably installed on the inner side of the movable groove 24. The push block 3 A friction block 39 is fixedly connected to one side wall of the drill bit 28, a wedge groove 310 is opened on the other side wall of the push block 38, a third spring 311 is fixedly connected to the surface of the push block 38, and a fourth spring 312 is fixedly connected to the bottom surface of the connecting plate 33. By providing a support tube 31 that can move outside the drill bit body 28, the drill bit body 28 can be extended when it is stuck in the rock and cannot be retracted into the fuselage 1, and supported on the outside of the rock that is stuck with the drill bit body 28, giving the fuselage 1 an upward force to assist the drill bit body 28 to be separated from the rock, saving manpower and improving the user experience of the device.

[0035] Furthermore, the output ends of the upper air intake valve 12 and the lower air intake valve 13 are respectively located on the upper and lower sides of the piston disk 16, and the piston disk 16 is adapted to the inner wall of the fuselage 1. The circulation of gas in the upper air intake valve 12 and the lower air intake valve 13 can drive the piston disk 16 to move downward and upward, thereby realizing the reciprocating motion of the drill bit body 28, so as to impact and excavate the rock.

[0036] Furthermore, the movable block 26 is located at the upper end of the inner side of the movable cavity 25, and the bottom end of the drill bit body 28 is exposed from the bottom surface of the fuselage 1. One end of the second spring 29 is fixedly connected to the bottom surface of the movable block 26. The second spring 29 is sleeved on the outer side of the first spring 27. The movable block 26 can move downward inside the movable cavity 25, so that the movement of the connecting rod 22 can drive the drill bit body 28 to move downward stably, which is convenient for impacting rocks. The second spring 29 provides power for the movable block 26 to reset inside the movable cavity 25.

[0037] Further, the support cylinder 31 is slidably installed inside the fuselage 1 through the limit block 32. The bottom end of the support cylinder 31 is located above the bottom end of the drill bit body 28. The connection disk 33 is located outside the movable groove 24. The limit block 32 guides and limits the movement of the support cylinder 31 to prevent the pull rope 34 from curling. The setting of the support cylinder 31 does not affect the movement of the drill bit body 28. The connection disk 33 can cooperate with the push block 38 inside the movable groove 24.

[0038] Further, the middle part of the pull rope 34 is wound around the outside of the roller 35. The pull rope 34 is in a "U" - shaped structure. One end of the pull rope 34 is fixedly connected to the upper end of the support cylinder 31. The connection disk 33 can pull one end of the pull rope 34, so that the support cylinder 31 connected to the other end of the pull rope 34 moves in the opposite direction.

[0039] Further, the movable column 36 is fixedly connected to the top surface of the movable block 26. The cross - shaped block 37 is slidably installed inside the cross - shaped groove 23. The bottom end of the cross - shaped block 37 is beveled and fits against the inner wall of the wedge - shaped groove 310. The movable column 36 can move together with the movable block 26. The cross - shaped groove 23 and the cross - shaped block 37 guide and limit the movement of the movable column 36, so that the cross - shaped block 37 can fixedly contact the wedge - shaped groove 310.

[0040] Further, the push block 38 is installed outside the movable column 36. The outer wall of the friction block 39 is flush with the outer wall of the connecting rod 22 and does not contact the inner wall of the connection disk 33. One end of the third spring 311 is fixedly connected to the inner wall of the movable groove 24. One end of the fourth spring 312 is fixedly connected to the inner wall of the fuselage 1. When the drill bit body 28 reciprocates normally, the connecting rod 22 does not drive the connection disk 33 to move. The third spring 311 provides power for the reset of the push block 38, and the fourth spring 312 provides power for the reset of the connection disk 33.

[0041] Working principle: Before use, connect the input end of the air intake pipe 11 to the air source. The gas enters the upper side of the piston disc 16 through the upper air intake valve 12, and the gas then pushes the piston disc 16 downward. The piston disc 16 drives the piston rod 15 to descend. The piston rod 15 drives the drill bit body 28 to move downward through the connecting block 21, connecting rod 22, movable block 26 and the first spring 27. Then the gas enters the lower side of the piston disc 16 through the lower air intake valve 13, and the gas pushes the piston disc 16 upward. The piston disc 16 drives the piston rod 15 to rise. The piston rod 15 drives the drill bit body 28 to move upward through the connecting block 21, connecting rod 22, movable block 26 and the first spring 27. At this time, the movable block 26 is fixed at the upper end inside the movable cavity 25 under the elastic action of the first spring 27. The cross block 37 cannot push the pushing block 38, and the pushing block 38 is separated from the connecting disc 33. At this time, the connecting disc 33 is fixed in place. By controlling the flow of gas in the upper air intake valve 12 and the lower air intake valve 13 for rapid switching, the piston disc 16 can perform high-frequency reciprocating motion, so that the drill bit body 28 can impact and cut the rock;

[0042] When the drill bit body 28 extends and gets stuck by the rock, the piston rod 15 and the piston disc 16 move upward under the action of the gas. The piston rod 15 pulls the connecting rod 22 to move upward through the connecting block 21. However, the drill bit body 28 at the bottom end of the connecting rod 22 cannot move along. At the same time, the movable column 36, the movable block 26 and the first spring 27 are all fixed on the drill bit body 28. Therefore, the connecting rod 22 will move relative to the drill bit body 28, the first spring 27, the movable block 26 and the movable column 36. The movable block 26 will move downward inside the movable cavity 25, and the movable block 26 will cooperate with the movable cavity 25 to squeeze the second spring 29. At the same time, the movable column 36 drives the cross block 37 to slide downward inside the cross groove 23. The cross block 37 fits the wedge groove 310. As the movable column 36 moves, the cross block 37 will push the pushing block 38, causing the pushing block 38 to slide inside the movable groove 24 and squeeze the third spring 311. The pushing block 38 will drive the friction block 39 to extend from the outer wall of the connecting rod 22. The friction block 39 will fit the inner wall of the connecting disc 33 outward, so that the connecting disc 33 is fixed outside the connecting rod 22. At this time, an integral body is formed among the connecting rod 22, the connecting disc 33, the cross block 37, the movable column 36, the pushing block 38 and the friction block 39. Therefore, when the connecting rod 22 rises, it can also generate an upward pulling force on the drill bit body 28. And the connecting disc 33 will rise together with the connecting rod 22. The movement of the connecting disc 33 will pull the fourth spring 312 to generate elastic deformation. The connecting disc 33 will pull one end of the pull rope 34, causing the support cylinder 31 connected to the other end of the pull rope 34 to move downward. The support cylinder 31 will move downward outside the drill bit body 28. The bottom end of the support cylinder 31 can support on the outside of the rock cutting area and react on the fuselage 1, causing the fuselage 1 to move upward. The fuselage 1 can generate an upward pulling force on the drill bit body 28 to assist the drill bit body 28 to break away from the rock, thereby saving manpower, improving the use experience, and preventing the fuselage 1 from being damaged due to the drill bit body 28 getting stuck and the impact of the rock drill on the rock under the action of the piston disc 16;

[0043] After the drill bit body 28 breaks away from the rock, the drill bit body 28 will reset under the elastic action of the second spring 29. The movable block 26 will reset inside the movable cavity 25. The movable column 36 and the cross block 37 will slide upward and reset inside the cross groove 23. The cross block 37 will release the abutment on the wedge groove 310. The pushing block 38 will reset under the elastic action of the third spring 311 and release the abutment on the connecting disc 33. The connecting disc 33 will reset under the elastic action of the fourth spring 312. The connecting disc 33 will pull the pull rope 34, causing the support cylinder 31 to retract into the fuselage 1 to prepare for the next rock cutting.

[0044] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention as shown in the accompanying drawings of the specification and as described above; however, any minor changes, modifications, and equivalent variations made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A rock drill for coal mining, comprising: A body (1), an air connection pipe (11) is installed on the outer wall of the body (1), an upper air intake valve (12) is connected to the middle of the air connection pipe (11), a lower air intake valve (13) is connected to the bottom of the air connection pipe (11), a limiting cylinder (14) is installed on the inner upper end of the body (1), a piston rod (15) is installed on the inner side of the limiting cylinder (14), and a piston disc (16) is installed in the middle of the piston rod (15); Features: A rock drilling structure (2) is installed on the inner side of the top of the machine body (1), and the rock drilling structure (2) comprises a connecting block (21), the connecting block (21) is fixedly connected to the bottom end of the piston rod (15), the bottom end of the connecting block (21) is fixedly connected to a connecting rod (22), a movable cavity (25) is provided at the bottom of the connecting rod (22), a cross groove (23) is provided on the top surface of the movable cavity (25), a movable groove (24) is provided on the side wall of the cross groove (23), a movable block (26) is movably installed on the inner side of the movable cavity (25), a first spring (27) is fixedly connected to the bottom surface of the movable block (26), a drill head body (28) is fixedly connected to the bottom end of the first spring (27), and a second spring (29) is fixedly connected to the inner wall of the movable cavity (25); A pull-out structure (3) is installed on the outer side of the rock drilling structure (2), and the pull-out structure (3) includes a support tube (31), the support tube (31) is sleeved on the outer side of the drill bit body (28), and a limit block (32) is integrally formed on the outer wall of the support tube (31), a connecting plate (33) is sleeved on the outer side of the connecting rod (22), and a pull rope (34) is fixedly connected to the bottom surface of the connecting plate (33), a roller (35) is movably installed on the inner wall of the machine body (1) through a bearing, and the cross groove (23 ) is movably installed on the inner side of the movable column (36), a cross block (37) is integrally formed on the outer wall of the movable column (36), a pushing block (38) is slidably installed on the inner side of the movable groove (24), a friction block (39) is fixedly connected to one side wall of the pushing block (38), a wedge groove (310) is provided on the other side wall of the pushing block (38), a third spring (311) is fixedly connected to the surface of the pushing block (38), and a fourth spring (312) is fixedly connected to the bottom surface of the connecting plate (33).

2. A rock drill for coal mining according to claim 1, characterized in that: The output ends of the upper air intake valve (12) and the lower air intake valve (13) are respectively located on the upper and lower sides of a piston disc (16), and the piston disc (16) is adapted to the inner wall of the fuselage (1).

3. A rock drill for coal mining according to claim 1, characterized in that: The movable block (26) is located at the upper end of the inner side of the movable cavity (25), the bottom end of the drill head body (28) is exposed from the bottom surface of the machine body (1), one end of the second spring (29) is fixedly connected to the bottom surface of the movable block (26), and the second spring (29) is sleeved on the outside of the first spring (27).

4. A rock drill for coal mining according to claim 1, characterized in that: The support tube (31) is slidably mounted inside the machine body (1) via a limit block (32); the bottom end of the support tube (31) is located above the bottom end of the drill head body (28); and the connecting plate (33) is located outside the movable groove (24).

5. A rock drill for coal mining according to claim 1, characterized in that: The middle portion of the pull rope (34) is wound around the outside of the roller (35), the pull rope (34) is in a "U"-shaped structure, and one end of the pull rope (34) is fixedly connected to the upper end of the support tube (31).

6. A rock drill for coal mining according to claim 1, characterized in that: The movable column (36) is fixedly connected to the top surface of the movable block (26), and the cross block (37) is slidably installed inside the cross groove (23). The bottom end of the cross block (37) is inclined and fits with the inner wall of the wedge groove (310).

7. A rock drill for coal mining according to claim 1, characterized in that: The pushing block (38) is installed on the outside of the movable column (36), the outer wall of the friction block (39) is flush with the outer wall of the connecting rod (22) and does not contact the inner wall of the connecting plate (33), one end of the third spring (311) is fixedly connected to the inner wall of the movable groove (24), and one end of the fourth spring (312) is fixedly connected to the inner wall of the fuselage (1).

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