Down-the-hole drill

Abstract

The invention discloses a down-the-hole drill, and particularly relates to the technical field of drilling machine equipment, the down-the-hole drill comprises a drilling machine main body and a drilling frame, a rotating device is installed at the moving output end of the drilling frame, a cross rod is fixed to the output end of the rotating device, a connecting block is fixed to one side of the drilling frame, and a limiting component is fixed to one side of the connecting block; and an external expansion part is arranged on the lower side of the limiting part. According to the down-the-hole drill disclosed by the invention, through mutual cooperation among the arranged cross-shaped rod, the driving gear and the external expansion part, soil accumulated around a hole can be pushed outwards in the drilling process; the situation that the drill rod cannot smoothly ascend or descend or rotate due to the fact that falling soil is possibly accumulated at the bottom of a drill hole or clamped between the drill rod and the hole wall is avoided, and the influence on the drilling progress is reduced; and through mutual cooperation of the arranged expansion component and the pushing component I, soil on the surface of the cross-shaped rod can be cleaned, and the soil can be prevented from falling into a drill hole in the process that the pushing component I pushes the soil.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a down-the-hole drilling rig. Background Art

[0002] A drilling rig is a mechanical device that drives the drill bit to drill in any direction and obtain physical geological data in geological exploration. The main function of the drilling rig is to break the bottom rock and put in or take out the drilling tool. As a new equipment for construction, after several years of promotion, the advantages of down-the-hole drilling rigs such as lightness, high efficiency, energy saving, low noise, low pollution, and wide adaptability to the formation have been recognized by more and more people. At present, it has been widely used in construction projects. It has the functions of rotation and impact, which makes the hard rock destroyed by impact, thereby speeding up the construction progress;

[0003] During the use of down-the-hole drills, the drilled soil accumulates around the borehole. If the soil is not cleaned in time, the soil may fall into the borehole. The fallen soil may accumulate at the bottom of the borehole or get stuck between the drill rod and the hole wall, causing the drill rod to be unable to rise or fall or rotate smoothly, thereby causing a drill jam accident. The drill jam will not only affect the drilling progress, but may also damage the drill tool and increase maintenance costs. Manual cleaning can also be used, but in the process of cleaning the soil, the splashing of stones in the soil may cause harm to the operator. Summary of the invention

[0004] The purpose of the present invention is to propose a down-the-hole drill to solve the problem that during the use of the down-the-hole drill, fallen soil may accumulate at the bottom of the borehole or get stuck between the drill rod and the hole wall, causing the drill rod to be unable to be smoothly lifted or rotated, thereby causing a drill sticking accident, affecting the drilling progress, possibly damaging the drill tool, and increasing maintenance costs.

[0005] In order to achieve the above purpose, the present invention adopts the following technology:

[0006] It comprises a drilling rig body and a drilling frame, wherein a rotary device is installed at the movable output end of the drilling frame, a cross rod is fixed at the output end of the rotary device, a connecting block is fixed at one side of the drilling frame, a limiting component is fixed at one side of the connecting block, and an outward expansion component is provided at the lower side of the limiting component;

[0007] The limiting component comprises a flat-top cone tube, and a plurality of limiting grooves in an annular array are formed on the inner cavity side wall of the flat-top cone tube;

[0008] The outward expansion component includes an annular frame, a limiting plate is fixed on the inner surface of the annular frame, a plurality of annular array slide grooves are opened on the limiting plate, a group of pushing components 1 and a group of pushing components 2 are movably installed in the inner cavities of the plurality of slide grooves, and the pushing components 1 and 2 are adapted to the limiting grooves;

[0009] During the movement of the limiting plate, the pushing component 1 and the pushing component 2 slide along the inner cavity of the limiting groove, and the plurality of pushing components 1 and the pushing components 2 expand obliquely outward.

[0010] As a further description of a down-the-hole drill rig of the above technology:

[0011] A driving gear is rotatably mounted on one side of the connecting block, and a cross groove matching the cross rod is provided on the driving gear.

[0012] As a further description of a down-the-hole drill rig of the above technology:

[0013] The outward expansion component includes two synchronous wheels rotatably mounted on the connecting block, a reciprocating screw is fixed on one side of the two synchronous wheels, and the two synchronous wheels are connected to the driving gear through a synchronous belt.

[0014] As a further description of a down-the-hole drill rig of the above technology:

[0015] The adjacent pushing component 1 and the pushing component 2 are located on the same straight line after being rotated by a certain angle, and the pushing component 1 and the pushing component 2 have the same structure.

[0016] As a further description of a down-the-hole drill rig of the above technology:

[0017] The pushing component 1 comprises a connecting rod slidably installed in the inner cavity of the limiting groove, a sliding block is fixed to one end of the connecting rod away from the limiting groove, and a pushing plate is fixed to one side of the sliding block.

[0018] As a further description of a down-the-hole drill rig of the above technology:

[0019] An expansion component is fixed on one side of the limit plate, and the expansion component includes a fixing ring fixed to the limit plate. A plurality of scrapers in an annular array are rotatably mounted on one side of the fixing ring. The plurality of scrapers are adapted to the cross rod, and the outer surfaces of the plurality of scrapers are rotatably connected to a rotating plate rotatably mounted between the slider.

[0020] As a further description of a down-the-hole drill rig of the above technology:

[0021] Two sets of mutually perpendicular protective devices are rotatably installed on the lower side of the connecting block, and the protective device includes a protective plate rotatably installed with the connecting block, an arc-shaped plate is fixed on one side of the protective plate, a rotating plate 2 rotatably connected to the slider is rotatably installed on one side of the protective plate, and a groove for the rotation of the arc-shaped plate is opened on the arc-shaped plate.

[0022] In summary, due to the use of the above-mentioned technology, the invention has the following beneficial effects:

[0023] 1. Through the cooperation between the cross rod, driving gear and outward expansion components, the device can push the soil accumulated around the hole outward during the drilling process, so as to prevent the fallen soil from accumulating at the bottom of the borehole or getting stuck between the drill rod and the hole wall, causing the drill rod to be unable to be smoothly lifted or rotated, thereby reducing the impact on the drilling progress; the driving gear rotates, and the two synchronous wheels are rotated through the synchronous belt, and the reciprocating screw connected to the two synchronous wheels rotates, so that the annular frame moves, and the slider moves with the limit plate during the movement of the annular frame. Due to the sliding connection between the connecting rod and the flat-top cone tube, the pushing component 1 and the pushing component 2 move along the inner cavity of the slide groove. The movement trajectory of the multiple pushing components 1 and 2 is to expand outward while moving downward, presenting a conical movement trajectory, which can push the soil accumulated around the borehole outward to prevent too much soil from accumulating and falling into the borehole.

[0024] 2. The device can not only clean the soil on the surface of the cross rod, but also prevent the soil from falling into the drill hole when the pushing component 1 pushes the soil through the cooperation between the expansion component 1 and the pushing component 1; under normal conditions, the scraper is in close contact with the cross rod, and the wet soil on the surface of the cross rod can be scraped off and the cross rod can be cleaned during the movement of the cross rod; during the movement of the pushing component 1, due to the rotational connection between the rotating plate 1 and the slider, the scraper can be tilted up during the movement of the slider, thereby forming a protection around the drill hole and preventing soil from falling into the drill hole.

[0025] 3. The mutual cooperation between the two sets of protective devices and the pushing component one in this device can push the soil on the outside, make room for the soil pushed by the pushing component one and the pushing component two, and further prevent soil accumulation; during the movement of the pushing component one, since the protective plate and the slider are connected by the rotating plate two, the protective plate can be rotated during the movement of the slider, thereby pushing the soil on the outside and leaving room for the soil pushed by the pushing component one and the pushing component two. During the rotation process, the coverage of the arc plate is larger than that of the protective plate, so more soil can be pushed to the outside, clearing space for the soil pushed out from the inside.

[0026] 4. The device can prevent stones from flying around by setting up two sets of mutually perpendicular protective devices. The two sets of mutually perpendicular protective devices have different lengths. One set of protective devices is located between the two protective devices of the other set, so that a rectangle is formed between the two sets of protective devices. During the drilling process, broken stones can be prevented from flying around, thereby reducing the risk of injury to the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It shows a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0028] Figure 2 It shows a partial structural schematic diagram provided according to an embodiment of the present invention Figure 1 ;

[0029] Figure 3 A schematic diagram showing the installation position of a driving gear according to an embodiment of the present invention is shown;

[0030] Figure 4 It shows a partial structural schematic diagram provided according to an embodiment of the present invention Figure 2 ;

[0031] Figure 5 A schematic diagram of the structure of a limiting component provided in an embodiment of the present invention is shown;

[0032] Figure 6 The structure of the external expansion component provided in the embodiment of the present invention is shown. Figure 1 ;

[0033] Figure 7 It shows a schematic structural diagram of a pushing component according to an embodiment of the present invention;

[0034] Figure 8 The structure of the external expansion component provided in the embodiment of the present invention is shown. Figure 2 ;

[0035] Fig. 9 It shows a schematic diagram of a connection structure between an expansion component and a pushing component provided in an embodiment of the present invention;

[0036] Fig.10 A schematic diagram showing a use state of an expansion component provided in an embodiment of the present invention is shown;

[0037] Fig.11 It shows a schematic diagram of the use state of the pushing component 1 and the pushing component 2 provided in an embodiment of the present invention;

[0038] Fig.12 It shows a schematic diagram of the motion trajectories of the pushing component 1 and the pushing component 2 provided according to an embodiment of the present invention;

[0039] Fig.13 A schematic diagram of the structure of a protective device provided in an embodiment of the present invention is shown;

[0040] Fig.14 A schematic diagram of the rotation trajectory of the protection plate and the arc plate provided according to an embodiment of the present invention is shown.

[0041] Legend:

[0042] 10. Drilling rig body;

[0043] 20. Drilling rack; 21. Rotating device; 22. Cross rod; 23. Connecting block; 24. Driving gear; 25. Cross slot;

[0044] 30. Protective device; 31. Protective plate; 32. Curved plate; 33. Rotating plate 2;

[0045] 40. Limiting component; 41. Flat-top cone tube; 42. Limiting groove;

[0046] 50. External expansion component; 51. Synchronous wheel; 52. Reciprocating screw; 53. Ring frame; 54. Limiting plate; 55. Slideway;

[0047] 56, pushing component 1; 561, connecting rod; 562, sliding block; 563, pushing plate; 57, pushing component 2;

[0048] 58. expansion component; 581. fixing ring; 582. scraper; 583. rotating plate 1. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the down-the-hole drill in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Embodiment 1

[0051] like Figure 1 and Figure 2 As shown, a down-the-hole drilling rig includes a drilling rig body 10 and a drilling rig 20. The drilling rig 20 includes an operating table, a hydraulic station, and a crawler walking component, etc., and is the main component of the device. The drilling rig 20 is rotatably installed on the drilling rig body 10, and the angle can be adjusted. A rotating device 21 is installed at the mobile output end of the drilling rig 20. The drilling rig 20 is a component that controls the upward and downward movement of the rotating device 21. The rotating device 21 is a component that controls the rotation of the drilling tool. A cross rod 22 is fixed at the output end of the rotating device 21. The end of the cross rod 22 away from the rotating device 21 is used to connect the drilling tool. The connected drilling tool includes a drill rod, a ball tooth drill bit, and an impactor.

[0052] Then, if Figure 2 — Figure 4As shown, a connecting block 23 is fixed on one side of the drilling frame 20, and a driving gear 24 is rotatably installed on one side of the connecting block 23. The center of the driving gear 24 is in the same straight line as the center of the output end of the rotary device 21. A cross groove tube is fixed on the upper side of the driving gear 24, so that the driving gear 24 can still be controlled to rotate when the cross rod 22 moves. A cross groove 25 adapted to the cross rod 22 is provided on the driving gear 24. Through the cross groove 25, the cross rod 22 can not only move up and down, but also rotate with the driving gear 24. The part of the cross rod 22 on the lower side of the driving gear 24 is only a round rod without a protrusion. A limiting component 40 is fixed on one side of the connecting block 23. The limiting component 40 corresponds to the cross rod 22. The center line of the limiting component 40 is in the same straight line as the center line of the cross rod 22. An outward expansion component 50 is provided on the lower side of the limiting component 40, and the outward expansion component 50 and the limiting component 40 are used in coordination.

[0053] To protect operators, Figure 3 As shown, two groups of mutually perpendicular protective devices 30 are rotatably installed on the lower side of the connecting block 23, one group of protective devices 30 has two, and the two groups of mutually perpendicular protective devices 30 have different lengths. One group of protective devices 30 is located between the two protective devices 30 of the other group, so that a rectangle is formed between the two groups of protective devices 30, which can prevent broken stones from splashing around during the drilling process, thereby reducing the risk of injury to the operator.

[0054] Further, if Figure 5 As shown, the limiting component 40 includes a flat-top conical tube 41 fixedly mounted on the connecting block 23. The flat-top conical tube 41 corresponds to the cross rod 22, so that the cross rod 22 can pass through the center of the inner cavity of the rotating device 21. The inner cavity side wall of the flat-top conical tube 41 is provided with a plurality of limiting grooves 42 in an annular array.

[0055] Further, if Figure 6 and Figure 8 As shown, the expansion component 50 includes two synchronous wheels 51 rotatably mounted on the connection block 23, the two synchronous wheels 51 are symmetrical to each other, a reciprocating screw 52 is fixed on one side of the two synchronous wheels 51, the reciprocating screw 52 passes through the connection block 23 and there is no connection between the connection block 23, the two synchronous wheels 51 are connected to the driving gear 24 through a synchronous belt, the driving gear 24 rotates to drive the two synchronous wheels 51 to rotate, thereby rotating the two reciprocating screws 52, and the synchronous belt connection can make the two synchronous wheels 51 rotate at the same angle and speed;

[0056] Next, the expansion component 50 further includes an annular frame 53, two mounting blocks on the annular frame 53 are threadedly connected with two reciprocating screws 52, and the two reciprocating screws 52 rotate to move the annular frame 53 up and down, and a limiting plate 54 is fixed on the inner surface of the annular frame 53, and the limiting plate 54 is integrally formed by a circular plate and a plurality of straight plates, and is fixed to the inner surface of the annular frame 53, and the center of the circular plate is in the same straight line with the center of the cross rod 22, and a plurality of slide grooves 55 in an annular array are provided on the limiting plate 54, and the plurality of slide grooves 55 correspond to the plurality of limiting grooves 42, and each slide groove 55 has a limiting groove 42 on the upper side thereof which is in the same straight line;

[0057] Among them, a group of pushing components 56 and a group of pushing components 57 are movably installed in the inner cavity of the multiple slide grooves 55. The pushing components 56 and the pushing components 57 in the group of pushing components 56 and the pushing components 57 are both annular arrays. There is a certain angle difference between the group of pushing components 56 and the group of pushing components 57.

[0058] The adjacent pushing components 1 56 and 2 57 are located on the same straight line after being rotated by a certain angle. In this embodiment, the adjacent pushing components 1 56 and 2 57 are located on the same straight line after being rotated by 45 degrees. There are four pushing components 1 56 and four pushing components 2 57 in a set of pushing components 1 56 and 2 57.

[0059] The push component 1 56 and the push component 2 57 have the same structure. The push component 1 56 and the push component 2 57 have the same structure but different lengths, so that the push component 2 57 and the push component 1 56 can cooperate with each other to operate.

[0060] Among them, Fig.11 and Fig.12 As shown, the pushing component 1 56 and the pushing component 2 57 are adapted to the limiting groove 42, and the pushing component 1 56 and the pushing component 2 57 slide in the inner cavity of the limiting groove 42. During the movement of the limiting plate 54, due to the action of the limiting groove 42, the pushing component 1 56 and the pushing component 2 57 slide along the inner cavity of the limiting groove 42, and the multiple pushing components 1 56 and the pushing components 2 57 expand obliquely outward, so as to push the soil near the drill hole to the outside.

[0061] Further, if Figure 7 As shown, the pushing component 1 56 includes a connecting rod 561 slidably installed in the inner cavity of the limiting groove 42, the connecting rod 561 is located in the inner cavity of the slide groove 55, the slide groove 55 limits the moving direction of the connecting rod 561, and a slider 562 is fixed to the end of the connecting rod 561 away from the limiting groove 42. The slider 562 is slidably connected to the limiting plate 54, and a push plate 563 is fixed to one side of the slider 562. One side of the push plate 563 is an inclined surface, which is convenient for pushing the soil;

[0062] Then, if Fig. 9 and Fig.10 As shown, an expansion component 58 is fixed to one side of the limit plate 54, and the expansion component 58 is located at the center of the limit plate 54. The expansion component 58 includes a fixing ring 581 fixed to the limit plate 54, and a plurality of scrapers 582 in an annular array are rotatably mounted on one side of the fixing ring 581. The side of the scrapers 582 away from the fixing ring 581 is in close contact with the cross rod 22, and the plurality of scrapers 582 are adapted to the cross rod 22. One side of the plurality of scrapers 582 is in close contact with the surface of the cross rod 22 but does not affect the movement of the scrapers 582.

[0063] The outer surfaces of the multiple scrapers 582 are all rotatably connected to a rotating plate 583 rotatably installed between the slider 562. The slider 562 moves to rotate with the scrapers 582. The multiple scrapers 582 expand outward at the same time, which can push the soil around the drill hole outward to prevent the soil from falling into the drill hole. At the same time, the retracted scrapers 582 can scrape the soil on the surface of the cross rod 22.

[0064] Next, the center of the fixed ring 581 and the limiting plate 54 are provided with a circular groove adapted to the cross rod 22, so that the cross rod 22 can move up and down normally, but will not rotate with the fixed ring 581 and the limiting plate 54;

[0065] In addition, the scraper 582 is adapted to the cross rod 22 . The scraper 582 is in close contact with the cross rod 22 in a normal state. When the cross rod 22 moves, the scraper 582 can scrape off the dirt on the surface of the cross rod 22 and clean the surface of the cross rod 22 .

[0066] Further, if Fig.13 As shown, the protection device 30 includes a protection plate 31 rotatably mounted with the connecting block 23, and a curved plate 32 is fixed to one side of the protection plate 31. One side of the curved plate 32 is on the same horizontal plane as the protection plate 31. However, during the rotation process, the coverage of the curved plate 32 is larger than that of the protection plate 31. Fig.14 As shown, more soil can be pushed outward to clear space for the soil pushed outward;

[0067] Among them, a rotating plate 2 33 rotatably connected to the slider 562 is rotatably installed on one side of the protective plate 31, and a groove for rotating the curved plate 32 is opened on the curved plate 32. During the movement of the slider 562, the protective plate 31 can be pushed to rotate through the connected rotating plate 2 33.

[0068] It should be noted that the drilling rig body 10, the drilling frame 20, the rotating device 21, the synchronous wheel 51 and the reciprocating screw 52 in the present invention are all prior arts, and their installation and control methods are also conventional designs, which will not be elaborated in detail in the present invention.

[0069] Working principle of the invention: The device is a down-the-hole drill, which is mainly used to push the soil accumulated around the borehole during the drilling process to prevent the soil from falling into the borehole cavity and accumulating at the bottom of the borehole or getting stuck between the drill rod and the hole wall, causing the drill rod to be unable to rise or fall or rotate smoothly;

[0070] Specifically, during use, the cross rod 22 is connected to the drill to drill a hole in the ground, and the drilled soil is accumulated around the drill hole to present a flat-top cone. Then, during the rotation of the cross rod 22, the driving gear 24 rotates with the cross rod 22 through the action of the cross groove tube and the cross groove 25.

[0071] Next, the driving gear 24 rotates, and the two synchronous wheels 51 rotate through the synchronous belt, and the reciprocating screws 52 connected to the two synchronous wheels 51 rotate, so that the annular frame 53 moves. During the movement of the annular frame 53, the slider 562 moves along with the limit plate 54. Since the connecting rod 561 and the flat-top cone tube 41 are slidably connected, the pushing component 1 56 and the pushing component 2 57 move along the inner cavity of the slide groove 55, as shown in FIG. Fig.11 and Fig.12 As shown, the movement trajectory of the plurality of pushing components 1 56 and 2 57 is to expand outward while moving downward, presenting a conical movement trajectory, which can push the soil accumulated around the borehole outward to prevent the soil from accumulating too much and falling into the borehole;

[0072] Furthermore, the plurality of pushing components 1 56 and pushing components 2 57 are not in the same circular plane, and the length of pushing component 1 56 is greater than the length of pushing component 2 57, so that more soil in the bottom layer can be further pushed;

[0073] The expansion member 58 can push the soil near the borehole outwards during the movement of the pushing member 56 to prevent the soil from falling into the borehole during the pushing of the soil by the pushing member 56. In addition, the scraper 582 is in close contact with the cross rod 22, so that the wet soil on the surface of the cross rod 22 can be scraped off during the movement of the cross rod 22 to clean the cross rod 22.

[0074] During the movement of the pushing component 56, due to the rotational connection between the rotating plate 583 and the slider 562, the scraper 582 can be tilted during the movement of the slider 562 to form a protection around the drill hole to prevent soil from falling into the drill hole;

[0075] In addition, during the movement of the pushing component 1 56, since the protective plate 31 and the slider 562 are connected by the rotating plate 2 33, the protective plate 31 can be rotated during the movement of the slider 562, thereby pushing the soil on the outside to leave space for the soil pushed by the pushing component 1 56 and the pushing component 2 57. During the rotation process, the coverage of the arc plate 32 is larger than that of the protective plate 31. Fig.14 As shown, more soil can be pushed outward to clear space for the soil pushed outward.

[0076] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to a down-the-hole drill and its inventive concept according to the technology of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A down-the-hole drilling rig, comprising a drilling rig body (10) and a drilling frame (20), characterized in that: A rotating device (21) is installed at the movable output end of the drilling frame (20), a cross rod (22) is fixed to the output end of the rotating device (21), a connecting block (23) is fixed to one side of the drilling frame (20), a limiting component (40) is fixed to one side of the connecting block (23), and an outward expansion component (50) is provided at the lower side of the limiting component (40); The limiting component (40) comprises a flat-topped conical tube (41), and a plurality of limiting grooves (42) in an annular array are formed on the inner cavity side wall of the flat-topped conical tube (41); The outward expansion component (50) comprises an annular frame (53), a limiting plate (54) is fixed on the inner surface of the annular frame (53), a plurality of slide grooves (55) in an annular array are formed on the limiting plate (54), a group of pushing components (56) and a group of pushing components (57) are movably installed in the inner cavities of the plurality of slide grooves (55), and the pushing components (56) and the pushing components (57) are adapted to the limiting grooves (42); During the movement of the limiting plate (54), the pushing component one (56) and the pushing component two (57) slide along the inner cavity of the limiting groove (42), and the plurality of pushing components one (56) and the pushing components two (57) expand outwardly in an oblique direction.

2. A down-the-hole drill according to claim 1, characterized in that: A driving gear (24) is rotatably mounted on one side of the connecting block (23), and a cross groove (25) matching the cross rod (22) is formed on the driving gear (24).

3. A down-the-hole drill according to claim 2, characterized in that: The outward expansion component (50) comprises two synchronous wheels (51) rotatably mounted on the connection block (23), a reciprocating screw rod (52) being fixed on one side of the two synchronous wheels (51), and the two synchronous wheels (51) are connected to the driving gear (24) via a synchronous belt.

4. A down-the-hole drill according to claim 1, characterized in that: After the adjacent pushing component 1 (56) and pushing component 2 (57) are rotated at a certain angle, they are located on the same straight line, and the pushing component 1 (56) and pushing component 2 (57) have the same structure.

5. A down-the-hole drill according to claim 1, characterized in that: The pushing component (56) comprises a connecting rod (561) slidably mounted in the inner cavity of the limiting groove (42), a sliding block (562) being fixed to one end of the connecting rod (561) away from the limiting groove (42), and a pushing plate (563) being fixed to one side of the sliding block (562).

6. A down-the-hole drill according to claim 1, characterized in that: An expansion component (58) is fixed to one side of the limit plate (54), and the expansion component (58) includes a fixing ring (581) fixed to the limit plate (54). A plurality of scrapers (582) in an annular array are rotatably mounted on one side of the fixing ring (581). The plurality of scrapers (582) are matched with the cross rod (22), and the outer surfaces of the plurality of scrapers (582) are rotatably connected to a rotating plate (583) rotatably mounted between the slider (562).

7. A down-the-hole drill according to claim 1, characterized in that: Two sets of mutually perpendicular protective devices (30) are rotatably mounted on the lower side of the connection block (23), the protective device (30) comprising a protective plate (31) rotatably mounted on the connection block (23), an arc-shaped plate (32) being fixed on one side of the protective plate (31), a rotating plate (33) rotatably mounted on one side of the protective plate (31) and rotatably connected to the slider (562), and a groove for rotating the arc-shaped plate (32) is provided on the arc-shaped plate (32).

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