A pneumatic down-the-hole hammer drilling device

Abstract

The present application relates to a pneumatic down-the-hole hammer drilling device, including a drill rod, an impactor and a drill bit, wherein the rear joint of the impactor is fixedly connected to the drill rod, the drill sleeve of the impactor is connected to the drill bit, the shell of the impactor is provided with a slag collecting chamber, the opening of the slag collecting chamber is located on the outer peripheral surface of the shell, the shell is also provided with a guide plate and a first driving mechanism, the guide plate is located directly above the opening of the slag collecting chamber, and the end of the guide plate away from the axis of the shell is tilted downward; the first driving mechanism is used to drive the guide plate to slide out of the outside of the shell or slide into the shell. The present application sets an extendable guide plate, when the slag is blown upward by compressed air, the moving slag will be guided by the guide plate into the slag collecting chamber, thereby reducing the accumulation of slag between the outer surface of the shell and the borehole wall to ensure drilling efficiency.

Description

Technical Field

[0001] The present application relates to the field of drilling equipment, and in particular to a pneumatic down-the-hole hammer drilling device. Background Art

[0002] Pneumatic down-the-hole hammer is a drilling tool used to form pile holes during the construction of building foundations. It is usually composed of an impactor and an impact hammer connected by spline sliding. Its hole-forming working principle is to use the power head installed on the drilling rig to drive the pneumatic down-the-hole hammer to rotate through the drill pipe, and use compressed air to push the piston in the impactor to force the impact hammer to make up and down reciprocating impact motion to achieve rock crushing.

[0003] In addition, the compressed air discharged after the down-the-hole hammer works will carry the broken rock cuttings to the ground, thereby achieving hole cleaning and slag removal.

[0004] With respect to the above-mentioned related technologies, the inventors believe that when the hole is drilled too deep, there is a lot of debris and it is easy to accumulate in the gap between the outer wall of the down-the-hole hammer and the wall of the drill hole. At this time, it is difficult to remove the debris, which affects the drilling efficiency. Summary of the invention

[0005] In order to ensure drilling efficiency, the present application provides a pneumatic down-the-hole hammer drilling device.

[0006] The present application provides a pneumatic down-the-hole hammer drilling device, which adopts the following technical solution:

[0007] A pneumatic down-the-hole hammer drilling device comprises a drill rod, an impactor and a drill bit, wherein the rear joint of the impactor is fixedly connected to the drill rod, the drill sleeve of the impactor is connected to the drill bit, the shell of the impactor is provided with a slag collecting chamber, the opening of the slag collecting chamber is located on the outer peripheral surface of the shell, the shell is also provided with a guide plate and a first driving mechanism, the guide plate is located directly above the opening of the slag collecting chamber, and the end of the guide plate away from the axis of the shell is tilted downward; the first driving mechanism is used to drive the guide plate to slide out of the outside of the shell or slide into the shell.

[0008] By adopting the above technical solution, when the slag is blown upward by compressed air, the moving slag will be guided by the guide plate into the slag collecting chamber, thereby reducing the accumulation of slag between the outer surface of the shell and the borehole wall to ensure drilling efficiency.

[0009] Furthermore, the guide plate is retractable, so when the debris is blown, the guide plate extends to guide the debris; when the debris is not blown, the guide plate is hidden, thereby reducing the probability of the guide plate being exposed for a long time and colliding with the borehole wall.

[0010] Optionally, the outer surface of the shell is in the shape of a hexagonal prism, the number of the guide plates is six and they correspond one to one to the edges of the shell, and two adjacent guide plates are located at different axial positions of the shell.

[0011] By adopting the above technical solution, firstly, multiple guide plates can intercept and guide the debris on the outer peripheral surface of the shell more comprehensively to reduce the escape of debris; secondly, the space between the circular drill hole and the edge surface of the hexagonal prism is composed of several small spaces with poor connectivity, thus effectively limiting the displacement range of the debris, thereby increasing the possibility of the debris being guided and collected; thirdly, adjacent guide plates have a certain axial distribution range, thus expanding the range of debris capture to reduce the occurrence of debris accumulation and difficulty in capturing.

[0012] Optionally, the slag collecting chamber includes a slag inlet channel, a transfer channel and a slag storage chamber which are connected in sequence starting from its own opening, wherein the transfer channel is horizontally arranged, the lower end of the slag inlet channel is connected with the inlet of the transfer channel, and the lower end of the slag storage chamber is connected with the outlet of the transfer channel through a curved channel; a pushing mechanism is also provided in the transfer channel, and the pushing mechanism is used to push the crushed slag falling from the slag inlet channel to the transfer channel into the slag storage chamber.

[0013] By adopting the above technical scheme, the slag is first guided into the slag inlet channel by the guide plate, and then falls to the entrance of the transfer channel due to gravity or the vibration force of the impactor, and then the pushing mechanism is started to push the slag in the transfer channel to the curved channel, and pushed into the slag storage chamber along the curvature of the curved channel to store the slag, and the slag inlet channel and the transfer channel are left empty to facilitate the entry of the slag next time, which is convenient and quick, and the storage efficiency of the slag is greatly improved.

[0014] Optionally, the inner wall of the slag storage chamber is provided with a plurality of rubber partitions arranged at intervals in the vertical direction, and the free ends of the rubber partitions are arranged to be inclined upward.

[0015] By adopting the above technical solution, the slag pushed upward into the slag storage chamber will force the rubber partition to deform. After the slag reaches a certain height, the rubber partition will restore its deformation. At this time, the rubber partition will support the slag to reduce the falling of the slag, thereby ensuring that the slag can be stably located at a certain height, so as to reduce the falling of the slag in the slag storage chamber and affect the subsequent upward pushing of the slag.

[0016] Optionally, an impeller and a second driving mechanism for driving the impeller to rotate are provided at the inlet of the slag inlet channel.

[0017] By adopting the above technical solution, during the process of capturing the slag, the impeller rotates, which, on the one hand, forms a negative pressure to attract the slag on the outside of the shell to the slag inlet channel, and on the other hand, the impeller exerts a force on the slag to quickly drive the slag into the slag inlet channel, thereby improving the capture efficiency.

[0018] Optionally, the impeller includes a rotating shaft and three blades fixed to the outer surface of the rotating shaft, the rotating shaft is rotatably connected to the shell, the cross-section of the blade is arched, and the arched part of the blade is located behind the impeller's rotation path compared to the free end of the blade.

[0019] By adopting the above technical solution, the amount of temporarily stored debris between adjacent blades can be increased, so that a larger amount of debris can be captured in one rotation.

[0020] Optionally, the blade includes an arched frame fixed on the rotating shaft, and a rubber diaphragm is covered and fixed on the hollow part of the arched frame; a shifting protrusion is fixed on the inner wall of the slag inlet channel, and when the rubber diaphragm moves to just above the inlet of the transfer channel, the edge of the rubber diaphragm interferes with the shifting protrusion.

[0021] By adopting the above technical solution, the rubber diaphragm has a certain elasticity, that is, the blades can be elastically deformed to avoid the debris to store larger debris, and have a buffering effect, which can reduce the damage of the reaction force of the debris to the impeller; secondly, the rubber diaphragms of adjacent blades can elastically clamp the debris at the same time, and the debris is not easily thrown off by the centrifugal force; and when the debris is brought to the top of the entrance of the transfer channel, the pushing protrusion interferes with the edge of the rubber diaphragm to force the rubber diaphragm to deform, thereby releasing the elastic clamping and causing the debris to fall downward to the entrance of the transfer channel to facilitate subsequent storage of debris.

[0022] Optionally, the second driving mechanism includes a second rack, a third rack, a second gear and a third gear, wherein the second gear and the third gear are respectively arranged at both ends of the rotating shaft, and a ratchet pawl structure is respectively provided between the second gear and the third gear and the rotating shaft, the second rack and the third rack are both fixedly connected to the piston of the impactor, and the second rack and the third rack are respectively located on both sides of the rotating shaft, the second rack is meshed with the second gear, and the third rack is meshed with the third gear.

[0023] By adopting the above technical scheme, the reciprocating motion of the piston drives the second rack and the third rack to reciprocate, and due to the positions of the second rack and the third rack, the second rack and the third rack respectively give the second gear and the third gear opposite torque directions, and the one-way drive of the ratchet and pawl structure is utilized, so that when the piston moves forward, due to the ratchet and pawl structure, the torque of the third gear cannot be transmitted to the rotating shaft, while the torque of the second rack and the second gear can be transmitted to the rotating shaft, driving the rotating shaft to rotate forwardly, and when the piston moves backward, due to the ratchet and pawl structure, the torque of the second gear cannot be transmitted to the rotating shaft, while the torque of the third rack and the third gear can be transmitted to the rotating shaft, still driving the rotating shaft to rotate forwardly, that is, the power transmission generated by the forward and reverse motions of the piston maintains the forward rotation of the rotating shaft, thereby ensuring that the impeller always keeps the forward rotation, so as to capture the debris.

[0024] Optionally, the first driving mechanism includes a first gear, a first rack, a turntable and a connecting rod, wherein the turntable is rotatably connected to the shell, the first gear is coaxially fixedly connected to the turntable, the first rack is fixedly connected to the piston of the impactor, and the first rack is meshingly connected to the first gear; one end of the connecting rod is eccentrically hinged to the turntable, and the other end of the connecting rod is hinged to the guide plate.

[0025] By adopting the above technical solution, the guide plate is driven to telescope and slide through the connecting rod transmission.

[0026] Optionally, the guide plate is a rubber sheet structure, wherein the middle portion of the guide plate along its own sliding direction is arched upward.

[0027] By adopting the above technical solution, the probability of the guide plate being rigidly damaged can be reduced, and the arch structure can maintain the structural stability of the guide plate.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] By providing an extendable guide plate, when the slag is blown upward by the compressed air, the moving slag will be guided by the guide plate into the slag collecting chamber, thereby reducing the accumulation of slag between the outer surface of the shell and the wall of the drill hole, so as to ensure the drilling efficiency;

[0030] By setting the position of the guide plate, not only can the debris on the outer peripheral surface of the shell be intercepted and guided more comprehensively to reduce the possibility of debris escaping, but also the movable range of the debris can be effectively limited, thereby increasing the possibility of the debris being guided and collected;

[0031] By setting a pushing mechanism, the crushed slag is pushed into the slag storage chamber to store the crushed slag, and the next entry of the crushed slag is convenient and fast, and the storage efficiency of the crushed slag is greatly improved;

[0032] By setting the impeller, on the one hand, negative pressure is formed to attract the slag on the outside of the shell to the slag inlet channel, and on the other hand, the impeller exerts force on the slag to quickly drive the slag into the slag inlet channel, thereby improving the capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0034] Figure 2 This is a partial cross-sectional view of the shell of Example 1.

[0035] Figure 3 It is a partial cross-sectional view of the first driving mechanism of the first embodiment.

[0036] Figure 4 It is a partial cross-sectional view of the shell of Example 2.

[0037] Figure 5 It is a partial cross-sectional view of the second embodiment for embodying the second driving mechanism.

[0038] Figure 6 It is a schematic diagram of Example 2 for reflecting the connection relationship between the second driving mechanism and the impeller.

[0039] Explanation of reference numerals: 1, slag collecting chamber; 3, guide plate; 4, first driving mechanism; 5, pushing mechanism; 6, rubber partition; 7, impeller; 8, second driving mechanism; 9, toggle protrusion; 10, drill rod; 100, first working chamber; 11, slag inlet channel; 12, transfer channel; 13, slag storage chamber; 14, curved channel; 20, impactor; 201, housing; 202, chute; 30, drill bit; 300, third working chamber; 40, movable Plug; 41, first rack; 42, first gear; 43, turntable; 44, connecting rod; 45, first connecting rod; 51, driving cylinder; 52, push plate; 53, baffle; 54, second connecting rod; 55, second working chamber; 71, rotating shaft; 72, blade; 721, arch frame; 722, rubber diaphragm; 81, second rack; 82, third rack; 83, second gear; 84, third gear; 85, ratchet and pawl structure. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-6 This application is described in further detail.

[0041] Embodiment 1 of the present application discloses a pneumatic down-the-hole hammer drilling device.

[0042] Reference Figure 1 The pneumatic down-the-hole hammer drilling device includes a drill rod 10, an impactor 20 and a drill bit 30 which are connected in sequence. Specifically, the rear joint of the impactor 20 is fixedly connected to the drill rod 10, and the drill sleeve of the impactor 20 is connected to the drill bit 30.

[0043] When in use, the power head on the drilling rig drives the impactor 20 and the drill bit 30 to rotate through the drill rod 10, and pushes the piston 40 in the impactor 20 through compressed air to force the drill bit 30 to perform up and down reciprocating impact motion to achieve rock crushing. In addition, the compressed air discharged after the piston 40 works is discharged upward from the bottom of the impactor 20 to drive the crushed debris upward.

[0044] like Figure 1 As shown, the outer surface of the shell 201 of the impactor 20 is in the shape of a hexagonal prism, and the shell 201 also has a slag collecting cavity 1 corresponding to each outer edge of the shell 201, the opening of the slag collecting cavity 1 is located on the outer peripheral surface of the shell 201, and the openings of two adjacent slag collecting cavities 1 are respectively located at different axial positions of the shell 201.

[0045] like Figure 2 As shown, the slag collecting chamber 1 includes a slag inlet channel 11, a transfer channel 12 and a slag storage chamber 13 which are connected in sequence starting from its own opening, wherein the slag inlet channel 11 extends axially along the shell 201, and the opening of the slag inlet channel 11 is located on the outer peripheral surface of the shell 201, the transfer channel 12 is extended radially along the shell 201, and the end of the transfer channel 12 away from the axis of the shell 201 is the inlet end, and the inlet of the transfer channel 12 is connected with the lower end of the slag inlet channel 11, and the slag storage chamber 13 is extended axially along the shell 201, and the slag storage chamber 13 is located on the side close to the axis of the shell 201 relative to the slag inlet channel 11, and the lower end inlet of the slag storage chamber 13 is connected with the outlet of the transfer channel 12 through the curved arc channel 14.

[0046] like Figure 2 , Figure 3 As shown, the shell 201 is also provided with a guide plate 3 and a first driving mechanism 4 which are arranged one by one in correspondence with the slag collecting chamber 1. The guide plate 3 is a rubber sheet structure. A chute 202 is provided above the opening of the slag inlet channel 11. The guide plate 3 is connected to the chute 202 by sliding downwardly at an angle, and the middle part of the guide plate 3 along its own sliding direction is arched upward. Through the first driving mechanism 4, the guide plate 3 can be slidably retracted into the chute 202, and the guide plate 3 can also be slidably extended out of the outside of the shell 201.

[0047] When the slag is blown upward by the compressed air, the guide plate 3 slides out of the outer side of the shell 201, and the moving slag will be guided by the guide plate 3 into the slag collecting chamber 1, thereby reducing the accumulation of slag between the outer surface of the shell 201 and the borehole wall to ensure drilling efficiency.

[0048] The first driving mechanism 4 can be an electric push rod, a cylinder and a hydraulic cylinder to achieve linear reciprocating motion. In this embodiment, Figure 3 As shown, the shell 201 is provided with a first working chamber 100 located just above the slag inlet channel 11, and the first driving mechanism 4 includes a first gear 42, a first rack 41, a turntable 43 and a connecting rod 44 located in the first working chamber 100, wherein the turntable 43 is rotatably connected to the inner wall of the first working chamber 100, the first gear 42 is coaxially fixedly connected to the turntable 43, the first rack 41 is parallel to the movement direction of the piston 40, the first rack 41 is fixedly connected to the piston 40, the first rack 41 is meshed with the first gear 42 to drive the turntable 43 to rotate, one end of the connecting rod 44 is eccentrically hinged to the turntable 43, and the other end of the connecting rod 44 is hingedly connected to the first connecting rod 45, and the first connecting rod 44 is fixedly connected to the guide plate 3, that is, the transmission is driven by the connecting rod 44 to drive the reciprocating sliding of the guide plate 3.

[0049] In order to improve the slag storage efficiency, the following settings are also made, such as Figure 2As shown, a pushing mechanism 5 is provided in the transfer channel 12, and the pushing mechanism 5 includes a driving cylinder 51 and a vertically arranged pushing plate 52, wherein the pushing plate 52 is located at the inlet end of the transfer channel 12, and the area of ​​the pushing plate 52 is equal to the cross-sectional area of ​​the transfer channel 12, and a horizontally arranged baffle 53 is fixed on the upper part of the pushing plate 52, and the baffle 53 is used to prevent the slag fragments from falling into the slag channel 11; the shell 201 also has a second working chamber 55, and the driving cylinder 51 is located in the second working chamber 55, and the telescopic end of the driving cylinder 51 is fixedly connected to the pushing plate 52 through a second connecting rod 54.

[0050] The slag is first guided into the slag inlet 11 by the guide plate 3, and then falls to the entrance of the transfer channel 12 due to gravity or the vibration force of the impactor 20, and then the driving cylinder 51 is started to drive the push plate 52 to move, so as to push the slag in the transfer channel 12 to the curved channel 14. During this period, the baffle 53 closes the lower end of the slag inlet 11 to prevent the slag in the slag inlet 11 from continuing to fall, and the debris pushed by the push plate 52 will be pushed upward into the slag storage chamber 13 along the curvature of the curved channel 14 to store the slag, and the slag inlet 11 and the transfer channel 12 are left empty for the next entry of the slag, which is convenient and quick, and the storage efficiency of the slag is greatly improved.

[0051] And, if Figure 2 As shown, the inner wall of the slag storage chamber 13 is provided with a plurality of rubber partitions 6 arranged at intervals in the vertical direction, one side of the rubber partition 6 is fixedly connected to the inner wall of the slag storage chamber 13, and the other side of the rubber partition 6 is arranged to be inclined upward.

[0052] The slag pushed upward into the slag storage chamber 13 by the pushing mechanism 5 will force the free end of the rubber partition 6 to deform upward to leave space for the slag to pass through. After the slag is pushed to a certain height, the rubber partition 6 resumes its deformation. At this time, the rubber partition 6 will support the slag to reduce the falling of the slag, thereby ensuring that the slag can be stably located at a certain height to reduce the falling of the slag in the slag storage chamber 13 and affect the subsequent pushing of the slag into the chamber.

[0053] Example 2, based on Example 1, the following settings are made: Figure 4 As shown, the housing 201 is further provided with an impeller 7 and a second driving mechanism 8 for driving the impeller 7 to rotate, wherein the impeller 7 is located at the inlet of the slag inlet channel 11, and the second driving mechanism 8 is used to drive the impeller 7 to rotate. The rotation direction of the impeller 7 is as shown in FIG. Figure 4 shown.

[0054] like Figure 5 , Figure 6As shown, the impeller 7 includes a rotating shaft 71 and three blades 72 fixed to the outer surface of the rotating shaft 71. The rotating shaft 71 is horizontally perpendicular to the sliding direction of the guide plate 3. The rotating shaft 71 is rotatably connected to the inner wall of the slag inlet channel 11. The two ends of the rotating shaft 71 are respectively located in the third working chamber 300 opened by the shell 201. The hole between the third working chamber 300 and the slag inlet channel 11 is sealed by a sealing ring.

[0055] The second driving mechanism 8 can be a driving motor that drives the rotating shaft 71 to rotate. In this embodiment, the second driving mechanism 8 includes a second rack 81, a third rack 82, a second gear 83 and a third gear 84 located in the third working chamber 300. The second gear 83 and the third gear 84 are respectively arranged at both ends of the rotating shaft 71. A ratchet pawl structure 85 is respectively provided between the second gear 83 and the third gear 84 and the rotating shaft 71. The ratchet pawl structure 85 can only transmit positive torque. The second rack 81 and the third rack 82 are both fixedly connected to the piston 40. The second rack 81 and the third rack 82 are both parallel to the sliding direction of the piston 40. The second rack 81 is meshed with the second gear 83, and the third rack 82 is meshed with the third gear 84.

[0056] When the piston 40 moves forward (moves downward), the piston 40 simultaneously drives the second rack 81 and the third rack 82 to move downward. At this time, the third rack 82 drives the third gear 84 to rotate forward, and the torque of the third gear 84 is transmitted to the rotating shaft 71 through the ratchet pawl structure 85 on this side to drive the rotating shaft 71 to rotate forward, while the second gear 83 rotates reversely, and its torque cannot be transmitted to the rotating shaft 71. Therefore, the torque of the second gear 83 will not affect the forward rotation of the rotating shaft 71; when the piston 40 moves reversely (moves upward), the piston 40 simultaneously drives the second rack 81 and the third rack 82 to move downward. The third rack 82 moves upward, at this time, the second rack 81 drives the second gear 83 to rotate forward, and the torque of the second gear 83 is transmitted to the rotating shaft 71 through the ratchet pawl structure 85 on this side to drive the rotating shaft 71 to rotate forward, while the third gear 84 rotates reversely, and its torque cannot be transmitted to the rotating shaft 71. Therefore, the torque of the third gear 84 will not affect the forward rotation of the rotating shaft 71, that is, when the piston 40 reciprocates forward and reverse, the rotating shaft 71 can rotate forward, and the impeller 7 applies force to the slag when rotating forward, so as to quickly drive the slag into the slag inlet 11, thereby improving the capture efficiency.

[0057] like Figure 6 As shown, the cross section of the blade 72 is arched, and the arched part of the blade 72 is located behind the positive rotation path of the impeller 7 compared to the free end of the blade 72; the blade 72 includes a rubber diaphragm 722 and an arched frame 721 with a notch, the arched frame 721 is fixed to the outer circumferential surface of the rotating shaft 71, the rubber diaphragm 722 is located in the hollow of the arched frame 721, and the two side edges of the rubber diaphragm 722 are respectively connected to the outer circumferential surface of the rotating shaft 71 and the corresponding parts of the arched frame 721.

[0058] The rubber diaphragm 722 has a certain elasticity, that is, the blade 72 can be elastically deformed to avoid debris to store larger debris, and the rubber diaphragms 722 of adjacent blades 72 can elastically clamp the debris at the same time, so that the debris is not easily thrown off by centrifugal force.

[0059] In addition, a stirring protrusion 9 is fixed to the inner wall of the slag inlet channel 11. When the slag is brought by the blade 72 to the top of the entrance of the transfer channel 12, the stirring protrusion 9 interferes with the edge of the rubber diaphragm 722 through the gap of the arch frame 721, so as to force the rubber diaphragm 722 to deform, thereby releasing the elastic clamping and allowing the slag to fall downward to the entrance of the transfer channel 12 for subsequent slag storage.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatic down-the-hole hammer drilling device, comprising a drill rod (10), an impactor (20) and a drill bit (30), wherein a rear joint of the impactor (20) is fixedly connected to the drill rod (10), and a drill sleeve of the impactor (20) is connected to the drill bit (30), characterized in that: The shell (201) of the impactor (20) is provided with a slag collecting chamber (1), the opening of the slag collecting chamber (1) is located on the outer peripheral surface of the shell (201), and the shell (201) is also provided with a guide plate (3) and a first driving mechanism (4), the guide plate (3) is located directly above the opening of the slag collecting chamber (1), and one end of the guide plate (3) away from the axis of the shell (201) is inclined downward; the first driving mechanism (4) is used to drive the guide plate (3) to slide out of the outer side of the shell (201) or slide into the shell (201) 1); the slag collecting chamber (1) comprises, starting from its own opening, a slag inlet channel (11), a transfer channel (12) and a slag storage chamber (13) which are connected in sequence, wherein the transfer channel (12) is arranged horizontally, the lower end of the slag inlet channel (11) is connected to the inlet of the transfer channel (12), and the lower end of the slag storage chamber (13) is connected to the outlet of the transfer channel (12) via a curved channel (14); a pushing mechanism (5) is also provided in the transfer channel (12), and the pushing mechanism (5) is used to push the crushed slag falling from the slag inlet channel (11) to the transfer channel (12) into the slag storage chamber (13).

2. The pneumatic down-the-hole hammer drilling device according to claim 1, characterized in that: The outer surface of the shell (201) is in the form of a hexagonal prism, the number of the guide plates (3) is six and they correspond one to one to the prism surfaces of the shell (201), and two adjacent guide plates (3) are respectively located at different axial positions of the shell (201).

3. The pneumatic down-the-hole hammer drilling device according to claim 1, characterized in that: The inner wall of the slag storage chamber (13) is provided with a plurality of rubber partitions (6) arranged at intervals in the vertical direction, and the free ends of the rubber partitions (6) are arranged to be inclined upward.

4. The pneumatic down-the-hole hammer drilling device according to claim 1, characterized in that: An impeller (7) and a second driving mechanism (8) for driving the impeller (7) to rotate are provided at the inlet of the slag inlet channel (11).

5. The pneumatic down-the-hole hammer drilling device according to claim 4, characterized in that: The impeller (7) comprises a rotating shaft (71) and three blades (72) fixed to the outer surface of the rotating shaft (71); the rotating shaft (71) is rotatably connected to the housing (201); the cross section of the blade (72) is arched, and the arched portion of the blade (72) is located behind the rotation path of the impeller (7) compared to the free end of the blade (72).

6. The pneumatic down-the-hole hammer drilling device according to claim 5, characterized in that: The blade (72) comprises an arched frame (721) fixed on the rotating shaft (71), and a rubber diaphragm (722) is fixedly covered in the hollow of the arched frame (721); an actuating protrusion (9) is fixedly provided on the inner wall of the slag inlet channel (11), and when the rubber diaphragm (722) moves to the position directly above the inlet of the transfer channel (12), the edge of the rubber diaphragm (722) interferes with the actuating protrusion (9).

7. The pneumatic down-the-hole hammer drilling device according to claim 5, characterized in that: The second driving mechanism (8) comprises a second rack (81), a third rack (82), a second gear (83) and a third gear (84), wherein the second gear (83) and the third gear (84) are respectively arranged at two ends of the rotating shaft (71), and ratchet pawl structures (85) are respectively arranged between the second gear (83) and the third gear (84) and the rotating shaft (71), and the second rack (81) and the third rack (82) are both fixedly connected to the piston (40) of the impactor (20), and the second rack (81) and the third rack (82) are respectively located on both sides of the rotating shaft (71), the second rack (81) is meshed with the second gear (83), and the third rack (82) is meshed with the third gear (84).

8. The pneumatic down-the-hole hammer drilling device according to claim 1, characterized in that: The first driving mechanism (4) comprises a first gear (42), a first rack (41), a rotating disk (43) and a connecting rod (44), wherein the rotating disk (43) is rotatably connected to the housing (201), the first gear (42) is coaxially fixedly connected to the rotating disk (43), the first rack (41) is fixedly connected to the piston (40) of the impactor (20), and the first rack (41) is meshingly connected to the first gear (42); one end of the connecting rod (44) is eccentrically hingedly connected to the rotating disk (43), and the other end of the connecting rod (44) is hingedly connected to the guide plate (3).

9. The pneumatic down-the-hole hammer drilling device according to claim 1, characterized in that: The guide plate (3) is a rubber sheet structure, wherein the middle portion of the guide plate (3) along its own sliding direction is arched upward.

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