Down-hole hammer

Abstract

The embodiment of the invention discloses a down-the-hole hammer, relates to the technical field of large-diameter pile foundation hole construction, can perform large-diameter pile foundation hole construction, and is beneficial to improving the construction efficiency of a large-diameter pile foundation hole. The down-the-hole hammer comprises a connector, an air storage part, an impact seat and a drill bit. The connector is used for being connected with a drill rod and provided with an airflow channel. The gas storage part is connected to the joint; the air storage part is provided with an air inlet hole and a plurality of air outlet holes communicated with the air inlet hole, and the air inlet hole is communicated with the airflow channel; the impact seat is connected to the air storage part, a sealing part is arranged between the impact seat and the air storage part, and the impact seat is provided with a plurality of impact cavities and a plurality of impactors; each impact cavity corresponds to one air outlet hole; each impactor is arranged in one impact cavity; wherein the impactor comprises a piston, and the piston can reciprocate under the action of air pressure; each drill bit is arranged at the end, away from the air storage piece, of the corresponding impactor so that a piston of the impactor can impact the drill bits in the reciprocating motion process. The method is suitable for pile foundation drilling and filling drilling scenes.

Description

Technical Field

[0001] This application relates to the technical field of large-diameter pile foundation hole construction, and specifically relates to a down-the-hole hammer. Background Art

[0002] With the continuous development of technology, the acceleration of the urbanization process has promoted the rapid development of infrastructure construction. In particular, the demand for large-diameter pile foundation holes is increasing day by day. Here, the large-diameter pile foundation hole refers to a pile foundation hole with a diameter of 500 mm - 2000 mm.

[0003] Traditional pile foundation hole construction equipment uses large rock drilling tools, which are often of a single structure, with high cost, difficult to replace, and difficult to meet the requirements in terms of efficiency, energy conservation, environmental protection, and cost control; while small rock drilling tools cannot meet the construction requirements of large-diameter pile foundation holes due to their single working ability. Summary of the Invention

[0004] In view of this, this application provides a down-the-hole hammer that can be used for the construction of large-diameter pile foundation holes, which is beneficial to improving the construction efficiency of large-diameter pile foundation holes.

[0005] In a first aspect, an embodiment of this application provides a down-the-hole hammer, including: a joint for connecting a drill pipe, and the joint is provided with an air flow channel; a gas storage member connected to the joint, the gas storage member is provided with an air inlet hole and a plurality of air outlet holes communicating with the air inlet hole, and the air inlet hole is communicated with the air flow channel; an impact seat connected to the gas storage member, and a sealing member is provided between the impact seat and the gas storage member; the impact seat is provided with a plurality of impact chambers and a plurality of impactors; each impact chamber corresponds to an air outlet hole; each impactor is disposed in an impact chamber; wherein, the impactor includes a piston that can reciprocate under the action of air pressure; a drill bit, there are a plurality of drill bits, and each drill bit is disposed at one end of an impactor away from the gas storage member, so that the piston of the impactor can impact the drill bit during the reciprocating motion.

[0006] In a specific implementation, the impactor further includes a piston chamber, the piston passes through the piston chamber, and the piston chamber can be communicated with the air outlet hole, so that the piston can reciprocate under the action of air pressure.

[0007] In a specific implementation, the first end of the gas storage member is connected to the joint, and the intake hole is provided at the first end of the gas storage member; the second end of the gas storage member is connected to the first end of the impact seat, and the plurality of outlet holes are provided at the second end of the gas storage member. A gas distribution channel is provided between each outlet hole and the intake hole to communicate with each other; and / or the outlet hole is a stepped hole, the outlet hole includes a first diameter hole and a second diameter hole, the inner diameter of the first diameter hole is smaller than the inner diameter of the second diameter hole, and the gas distribution channel communicates the first diameter hole and the intake hole; a check valve is further provided at the first end of the impactor, and the check valve can elastically abut against the orifice of the first diameter hole.

[0008] In a specific implementation, the impactor further includes an outer cylinder, an inner cylinder, a gas distribution seat and a bushing; the outer cylinder is disposed through the impact chamber, the inner cylinder is disposed through the first end of the outer cylinder, the bushing is disposed through the second end of the outer cylinder, the gas distribution seat is disposed through the inner cylinder, and the outer cylinder, the inner cylinder, the gas distribution seat and the bushing form the piston chamber.

[0009] In a specific implementation, the impactor forms a first stroke air chamber, a second stroke air chamber, and a return stroke air chamber; the impactor further forms a first air guiding channel, a displacement air guiding channel, and a second air guiding channel; the first air guiding channel can communicate with the outlet hole; the displacement air guiding channel is connected to the first air guiding channel, the displacement air guiding channel is connected to the first stroke air chamber, and the displacement air guiding channel can communicate with the second stroke air chamber; the second air guiding channel can be connected to the displacement air guiding channel, and the second air guiding channel can communicate with the return stroke air chamber.

[0010] In a specific implementation, the piston forms a first stroke thrust surface in the first stroke air chamber; the piston forms a return stroke thrust surface in the return stroke air chamber; the piston forms a second stroke thrust surface in the second stroke air chamber; wherein, the area of the first stroke thrust surface is smaller than the area of the return stroke thrust surface.

[0011] In a specific implementation, a groove is provided on one side of the gas distribution seat close to the gas storage member, a check valve is further provided at the first end of the impactor, one end of the check valve is disposed through the groove, and an elastic member is provided in the groove. The two ends of the elastic member respectively abut against the gas distribution seat and the check valve, so that the other end of the check valve can elastically abut against the outlet hole.

[0012] In a specific embodiment, it further includes a guide, the guide is connected to the second end of the impact seat, the guide is provided with a plurality of guide holes, and each of the guide holes corresponds to one of the impact chambers; the drill bit is inserted through the guide holes.

[0013] In a specific embodiment, a first polyhedron is formed on the outer wall of the drill bit, a sleeve is provided in the guide hole, the sleeve has an inner wall adapted to the first polyhedron, a second polyhedron is formed on the outer wall of the sleeve, and the guide hole has an inner wall adapted to the second polyhedron.

[0014] In a specific embodiment, an axial slag discharge groove of the gas storage member is provided on the outer wall of the gas storage member along the axial direction of the gas storage member; and / or an axial slag discharge groove of the impact seat is provided on the outer wall of the impact seat along the axial direction of the impact seat; and / or an axial slag discharge groove of the guide is provided on the outer wall of the guide along the axial direction of the guide; and / or a plurality of convex platforms are provided on the circumferential direction at one end of the guide away from the impact seat, and a radial slag discharge groove of the guide is provided on the top end surface of the convex platform along the radial direction of the guide.

[0015] In a specific embodiment, the drill bit has a through hole penetrating both ends, a radial slag discharge groove of the drill bit is provided on the head end surface of the drill bit along the radial direction of the drill bit, an arc structure is formed on the head of the drill bit, and the arc structures of the plurality of drill bits configured by the down-the-hole hammer are concentrically arranged.

[0016] The down-the-hole hammer provided by the embodiments of the present application includes: a sub, an air storage member, an impact seat, and a drill bit; the sub is used to connect the drill pipe, and the sub is provided with an air flow channel; the air storage member is connected to the sub, the air storage member is provided with an air inlet hole and a plurality of air outlet holes communicated with the air inlet hole, and the air inlet hole is communicated with the air flow channel; the impact seat is connected to the air storage member, and a sealing member is provided between the impact seat and the air storage member; the impact seat is provided with a plurality of impact chambers and a plurality of impactors; each impact chamber corresponds to an air outlet hole; each impactor is arranged in an impact chamber; wherein, the impactor includes a piston, and the piston can reciprocate under the action of air pressure; there are a plurality of drill bits, and each drill bit is arranged at one end of an impactor away from the air storage member, so that the piston of the impactor can impact the drill bit during the reciprocating motion. The down-the-hole hammer configures the impact seat to include a plurality of impact chambers and corresponding impactors, and the gas entering from the air flow channel is shunted and acts on each impactor and drill bit. In this way, it is convenient to quickly maintain the faulty impact chamber, impactor or drill bit, etc., without affecting other impact chambers, impactors or drill bits, etc., which is beneficial to reducing the equipment maintenance time, thereby improving the construction efficiency of large-diameter pile foundation holes. In addition, it can also improve the modular level of the down-the-hole hammer, improve the universality of components and optimize the spatial layout of components, which is beneficial to the miniaturization and standardization design of down-the-hole hammer components to meet the use requirements of complex and changeable construction environments, thereby improving the practicability and universality of the down-the-hole hammer and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0018] Figure 1 Schematic diagram of a down-the-hole hammer provided by an embodiment of the present application; Figure 2 Schematic diagram of an impactor of a down-the-hole hammer provided by an embodiment of the present application; Figure 3 Right view schematic diagram of an air storage member of a down-the-hole hammer provided by an embodiment of the present application; Figure 4 Cross-sectional schematic diagram of an air storage member of a down-the-hole hammer provided by an embodiment of the present application; Figure 5 Left view schematic diagram of an air storage member of a down-the-hole hammer provided by an embodiment of the present application; Figure 6 Schematic diagram of an impact seat of a down-the-hole hammer provided by an embodiment of the present application; Figure 7 Cross-sectional schematic diagram of an impact seat of a down-the-hole hammer provided by an embodiment of the present application; Figure 8 The right view schematic diagram of a guide device of a down-the-hole hammer provided by an embodiment of the present application; Figure 9 The sectional view schematic diagram of a guide device of a down-the-hole hammer provided by an embodiment of the present application; Figure 10 The left view schematic diagram of a guide device of a down-the-hole hammer provided by an embodiment of the present application; Figure 11 The schematic diagram of a drill bit of a down-the-hole hammer provided by an embodiment of the present application; Figure 12 The right view schematic diagram of a drill bit of a down-the-hole hammer provided by an embodiment of the present application; Figure 13 The sectional view schematic diagram of a drill bit of a down-the-hole hammer provided by an embodiment of the present application.

[0019] Main reference numeral description: 100 - down-the-hole hammer; 10 - sub; 11 - air flow channel; 20 - gas storage member; 21 - air inlet hole; 22 - air outlet hole; 23 - air distribution channel; 24 - axial slag discharge groove of gas storage member; 25 - convex body of gas storage member; 30 - impact seat; 31 - impact chamber; 32 - impactor; 321 - piston; 3211 - first stroke thrust surface; 3212 - return stroke thrust surface; 3213 - second stroke thrust surface; 3214 - first shaft diameter section; 3215 - second shaft diameter section; 3216 - third shaft diameter section; 3217 - wall groove; 322 - check valve; 323 - outer cylinder; 3231 - first annular groove; 3232 - second annular groove; 3233 - snap ring; 324 - inner cylinder; 3241 - first wall hole; 3242 - second wall hole; 3243 - inner groove; 325 - air distribution seat; 3251 - groove; 3252 - elastic member; 3253 - first disk body; 3254 - second disk body; 3255 - rod body; 3256 - chamber between disks; 3257 - air distribution through hole; 326 - bushing; 327 - first stroke air chamber; 328 - return stroke air chamber; 329 - second stroke air chamber; 33 - axial slag discharge groove of impact seat; 34 - washer; 35 - concave body of impact seat; 36 - convex body of impact seat; 40 - drill bit; 401 - radial slag discharge groove of drill bit; 402 - arc structure; 50 - guide device; 51 - guide hole; 52 - kit; 53 - boss; 54 - radial slag discharge groove of guide device; 55 - axial slag discharge groove of guide device; 56 - snap ring; 57 - concave body of guide device. Detailed implementation manners

[0020] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0022] Due to the problems of long construction period, high energy consumption, high cost, and frequent maintenance commonly existing in traditional large pile foundation construction equipment, its wide application in heavy load environments such as mines is restricted. While conventional small rock drilling tools have been widely used in daily engineering due to the maturity of technology and low cost. These small devices have advantages such as high flexibility, convenient operation, and controllable cost. However, due to their single working ability, they often cannot meet the requirements of large-diameter pile foundation holes. To solve the deficiencies of traditional equipment under the modern engineering requirements and at the same time utilize the mature technology of small rock drilling tools, such as Figure 1 As shown, an embodiment of this application provides a down-the-hole hammer 100, which may include: a sub 10, an air storage member 20, an impact seat 30, and a drill bit 40.

[0023] The sub 10 is used to connect the drill pipe, and the sub 10 is provided with an air flow channel 11; for example, the outer wall of the first end of the sub 10 may be set as a hexagonal prism structure to facilitate quick clamping with the drill pipe, and the second end of the sub 10 may be set with an external thread structure, so that it can be connected in cooperation with the corresponding threaded hole opened on the air storage member 20. The sub 10 may axially open an air flow channel 11 penetrating through both ends, and the compressed air provided by the air compressor can pass through this air flow channel 11 to supply high-pressure gas to the air storage member 20.

[0024] The air storage member 20 is connected to the sub 10. The air storage member 20 is provided with an air inlet hole 21 and a plurality of air outlet holes 22 communicated with the air inlet hole 21, and the air inlet hole 21 is communicated with the air flow channel 11. In this embodiment, the volume of the air inlet hole 21 of the air storage member 20 may be larger than the volume of the air outlet holes 22, so that the air inlet hole 21 can supply gas to each air outlet hole 22 more stably. In addition, it can form a storage space for the gas transported by the air flow channel 11 of the sub 10 to improve the stability of gas transmission. The air storage member 20 is configured with a plurality of air outlet holes 22, and the plurality of air outlet holes 22 may be evenly distributed around the axis of the air storage member 20; each air outlet hole 22 can form an impact on one of the drill bits 40 through the impact seat 30 to break the rock. For example, if the air storage member 20 is configured with two air outlet holes 22, impacts can be formed on two drill bits 40. If the air storage member 20 is configured with three air outlet holes 22, impacts can be formed on three drill bits 40. When the air storage member 20 is configured with n air outlet holes 22, impacts can be formed on n drill bits 40, thereby forming a cluster down-the-hole hammer 100.

[0025] The impact seat 30 is connected to the gas storage member 20, and a sealing member is provided between the impact seat 30 and the gas storage member 20; the impact seat 30 is provided with a plurality of impact chambers 31 and a plurality of impactors 32; each impact chamber 31 corresponds to an air outlet hole 22; each impactor 32 is disposed in an impact chamber 31; wherein, as Figure 2 shown, the impactor 32 includes a piston 321, and the piston 321 can reciprocate under the action of air pressure. The number of impact chambers 31 provided in the impact seat 30 corresponds to the number of air outlet holes 22, and the plurality of impact chambers 31 can be evenly distributed around the axial direction of the impact seat 30. An impactor 32 is disposed in the impact chamber 31, and the impactor 32 is configured with a piston 321. In this way, through the switching of the air supply flow path, the piston 321 can reciprocate under the action of air pressure. During the reciprocating movement of the piston 321, the corresponding drill bit 40 can be impacted to generate a strong impact force, thereby breaking the rock.

[0026] There are a plurality of drill bits 40, and each drill bit 40 is disposed at one end of an impactor 32 away from the gas storage member 20, so that the piston 321 of the impactor 32 can impact the drill bit 40 during the reciprocating movement. The drill bit 40 is used to transmit the impact energy and break the rock. The drill pipe drives the down-the-hole hammer 100 and the drill bit 40. And under the impact of the piston 321 at the tail of the drill bit 40, the head of the drill bit 40 breaks the rock. Specifically, during the working process, the drill pipe rotates and under the action of the axial pressure of the hydraulic system, the drill bit 40 rotates and shears and breaks the rock surface. The down-the-hole hammer 100 mainly breaks the rock by impact and supplements with rotary rock breaking. The impact load causes a fracture pit, and the rotary torque effectively cuts the fan-shaped part between the fracture pits; due to the sudden impact, local stress concentration occurs and the rock reaches the strength limit value before it can be redistributed, thus brittle fracture occurs; at the same time, the rotary force generates a shearing effect on the rock of the convex ridge, causing the rock to separate in the form of large particles; thus, the combined action of impact breaking and rotary cutting is realized. In this embodiment, the weight of the drill bit 40 and the weight of the piston 321 can be designed to be close to each other to improve the transmission efficiency of the impact energy. The drill bit 40 bears a large dynamic load and frictional force, so the drill bit 40 can be designed to have a high surface hardness, high wear resistance and impact resistance; the drill bit 40 can be of a blade type, a button type or a ball button type, etc., and this embodiment does not limit this. Further, the drill bit 40 can be configured with a channel for compressed air to pass through, such as a through hole penetrating both ends of the drill bit 40, to discharge the rock debris generated by cutting out of the hole through the slag discharge channel.

[0027] The down-the-hole hammer 100 is configured with multiple drill bits 40, and the multiple drill bits 40 can be evenly distributed around the axial direction of the down-the-hole hammer 100. Each impactor 32 acts on one of the drill bits 40. In this way, a modular structure design can be adopted, and each module works together to ensure the stability and efficiency of the equipment during high-intensity operations. When one of the drill bits 40 fails, such as a broken shank, chipped block, or severe wear, the corresponding drill bit 40 can be quickly replaced individually, reducing the usage cost. Compared with traditional single large drill tools, the multiple impactors 32 of the down-the-hole hammer 100 in this embodiment work together to generate multiple impact forces on the rock simultaneously, making the crushing effect more significant and thus accelerating the drilling speed. In addition, the down-the-hole hammer 100 can adapt to various complex geological conditions, including the construction requirements of hard rock layers, gravel layers, and other hard rock and soil, which makes its application range wide and its applicability strong. Compared with large drill tools, the down-the-hole hammer 100 has a higher drilling efficiency and can complete more drilling work in the same time, significantly shortening the construction period.

[0028] The down-the-hole hammer 100 provided by the embodiment of the present application includes: a sub 10, an air storage member 20, an impact seat 30, and a drill bit 40; the sub 10 is used to connect the drill pipe, and the sub 10 is provided with an air flow channel 11; the air storage member 20 is connected to the sub 10, the air storage member 20 is provided with an air inlet hole 21 and a plurality of air outlet holes 22 communicated with the air inlet hole 21, and the air inlet hole 21 is communicated with the air flow channel 11; the impact seat 30 is connected to the air storage member 20, and a seal is provided between the impact seat 30 and the air storage member 20; the impact seat 30 is provided with a plurality of impact chambers 31 and a plurality of impactors 32; each impact chamber 31 corresponds to an air outlet hole 22; each impactor 32 is disposed in an impact chamber 31; wherein, the impactor 32 includes a piston 321, and the piston 321 can reciprocate under the action of air pressure; there are multiple drill bits 40, and each drill bit 40 is disposed at one end of an impactor 32 away from the air storage member 20, so that the piston 321 of the impactor 32 can impact the drill bit 40 during the reciprocating motion. The down-the-hole hammer 100 configures the impact seat 30 to include a plurality of impact chambers 31 and corresponding impactors 32. The gas entering from the air flow channel 11 is shunted and acts on each impactor 32 and drill bit 40. In this way, it is convenient to quickly maintain the faulty impact chamber 31, impactor 32, drill bit 40, etc., without affecting other impact chambers 31, impactors 32, drill bits 40, etc., which is beneficial to reducing the equipment maintenance time and thus improving the construction efficiency of large-diameter pile foundation holes. In addition, the modular level of the down-the-hole hammer 100 can be improved, the generality of components can be increased, and the spatial layout of components can be optimized, which is beneficial to the miniaturization and standardization design of the components of the down-the-hole hammer 100 to meet the usage requirements of complex and changeable construction environments, thereby improving the practicability and generality of the down-the-hole hammer 100 and reducing the construction cost.

[0029] Optionally, in an embodiment of the present application, as Figure 1 、 Figure 2As shown, the impactor 32 further includes a piston chamber. The piston 321 is disposed through the piston chamber, and the piston chamber can communicate with the air outlet hole 22, so that the piston 321 can reciprocate under the action of air pressure. Since the impactor 32 is configured with a piston chamber, when a certain impactor 32 fails or is damaged, the impactor 32 can be taken out and replaced separately without affecting other normal working impactors 32, thereby improving the modular level of the impactor 32 and being beneficial to improving the working efficiency of the down-the-hole hammer. In this embodiment, as Figure 2 shown, the impactor 32 can be further configured with a cylinder block structure or the like to form a piston chamber. In addition, in some other embodiments, the impact chamber 31 can also separately form a piston chamber or participate in forming a piston chamber.

[0030] Optionally, in an embodiment of the present application, as Figures 3 - 5 shown, the first end of the air storage member 20 is connected to the joint 10, and an air inlet hole 21 is opened at the first end of the air storage member 20; the second end of the air storage member 20 is connected to the first end of the impact seat 30, and a plurality of air outlet holes 22 are opened at the second end of the air storage member 20. A gas distribution channel 23 is provided between each air outlet hole 22 and the air inlet hole 21 to communicate with each other; and / or, the air outlet hole 22 is a stepped hole. The air outlet hole 22 includes a first diameter hole and a second diameter hole, and the inner diameter of the first diameter hole is smaller than the inner diameter of the second diameter hole. The gas distribution channel 23 communicates the first diameter hole and the air inlet hole 21; a check valve 322 is further provided at the first end of the impactor 32, and the check valve 322 can elastically abut against the orifice of the first diameter hole.

[0031] In this embodiment, the aperture of the air inlet hole 21 can be larger than that of the air outlet hole 22, so that the air inlet hole 21 has a larger volume, and an internal thread is provided in the air inlet hole 21, which can be connected to the external thread at the second end of the joint 10. After the air storage member 20 is connected to the joint 10, the compressed air provided by the air compressor can enter the air inlet hole 21 through the air flow channel 11 penetrating both ends of the joint 10. Since a gas distribution channel 23 is respectively provided between each air outlet hole 22 and the air inlet hole 21 to communicate with each other, the compressed air in the air inlet hole 21 enters the air outlet hole 22 through the gas distribution channel 23, so that the compressed air in the air inlet hole 21 is evenly distributed and delivered to each air outlet hole 22. The plurality of air outlet holes 22 can be evenly distributed around the axis of the air storage member 20, and the corresponding gas distribution channels 23 of the plurality of air outlet holes 22 can also be evenly distributed around the axis of the air storage member 20. The air outlet hole 22 is a stepped hole, including a first diameter hole with a smaller diameter and a second diameter hole with a larger diameter, and a check valve 322 is further provided at the first end of the impactor 32. The orifice of the first diameter hole can be designed as a cone shape, so that it can be closely matched with the check valve 322. The check valve 322 elastically abuts against the orifice of the first diameter hole and can be opened and closed according to the air pressure, thereby preventing the waste residue and mud at the bottom of the hole from flowing back into the interior of the impactor 32 when the down-the-hole hammer 100 stops working during the drilling process, causing the impactor 32 to be stuck and fail.

[0032] In this embodiment, the second end of the gas storage member 20 is connected to the first end of the impact seat 30. Specifically, a flange or flange structure can be provided at the second end of the gas storage member 20 and bolted to the corresponding position at the first end of the impact seat 30. To ensure that the second end of the gas storage member 20 and the first end of the impact seat 30 can be accurately positioned for connection and combination, a convex body can be provided on the end face of the second end of the gas storage member 20, a concave body can be provided at the corresponding position at the first end of the impact seat 30, or a concave body can be provided on the end face of the second end of the gas storage member 20, and a convex body can be provided at the corresponding position at the first end of the impact seat 30. The convex body and the concave body can be adapted and engaged to facilitate installation and positioning, and facilitate the assembly and disassembly of the gas storage member 20 and the impact seat 30. For example Figure 4 As shown, in this embodiment, a plurality of gas storage member convex bodies 25 are axially provided around the second end of the gas storage member 20, such as Figure 6 , Figure 7 As shown, a plurality of impact seat concave bodies 35 are axially provided around the first end of the impact seat 30. In addition, a sealing groove can be opened at the orifice position of the second diameter hole on the end face of the second end of the gas storage member 20 and a sealing member can be provided, so as to ensure the sealing performance of the air outlet 22 and prevent compressed air from leaking between the second end of the gas storage member 20 and the first end of the impact seat 30.

[0033] Optionally, in an embodiment of the present application, as Figure 2 shown, the impactor 32 further includes an outer cylinder 323, an inner cylinder 324, a gas distribution seat 325 and a bushing 326; the outer cylinder 323 is disposed through the impact chamber 31, the inner cylinder 324 is disposed through the first end of the outer cylinder 323, the bushing 326 is disposed through the second end of the outer cylinder 323, the gas distribution seat 325 is disposed through the inner cylinder 324, and the outer cylinder 323, the inner cylinder 324, the gas distribution seat 325 and the bushing 326 form a piston chamber; the outer cylinder 323, the inner cylinder 324 and the bushing 326 can be respectively tubular structures with both ends penetrating. In this way, based on the structural layout and characteristics of components such as the outer cylinder 323, the inner cylinder 324, the gas distribution seat 325 and the bushing 326, and combined with the movement position of the piston 321, corresponding fluid channels can be constructed to form a thrust in a corresponding direction on the piston 321, so that the piston 321 can reciprocate and impact the drill bit 40.

[0034] Optionally, in an embodiment of the present application, as Figure 2As shown, the impactor 34 is formed with a first stroke air chamber 327, a second stroke air chamber 329, and a return stroke air chamber 328; in this embodiment, the impactor 32 is formed with a first stroke air chamber 327 and a second stroke air chamber 329 for applying an air pressure force in the direction of the drill bit 40 to the piston 321, and a return stroke air chamber 328 for applying an air pressure force in the direction away from the drill bit 40 to the piston 321; the impactor 32 is further formed with a first air guiding channel, a displacement air guiding channel, and a second air guiding channel; the first air guiding channel can communicate with the air outlet hole 22; the displacement air guiding channel is connected to the first air guiding channel, the displacement air guiding channel is connected to the first stroke air chamber 327, and the displacement air guiding channel can communicate with the second stroke air chamber 329; the second air guiding channel can be connected to the displacement air guiding channel, and the second air guiding channel can communicate with the return stroke air chamber 328.

[0035] There are various ways for the impactor 32 to form the above structure. For example, the air distribution seat 325 may include a first disk body 3253, a second disk body 3254, and a rod body 3255. The first disk body 3253 and the second disk body 3254 are axially disposed through the inner cylinder 324. A chamber 3256 is formed between the first disk body 3253, the second disk body 3254, and the inner cylinder 324. An air distribution through hole 3257 communicating the air outlet hole 22 and the chamber 3256 is formed on the first disk body 3253.

[0036] The inner diameter of the inner cylinder 324 is smaller than the inner diameter of the outer cylinder 323. Therefore, the piston 321 can be configured in a stepped shaft shape. The piston 321 may include a first shaft diameter section 3214, a second shaft diameter section 3215, and a third shaft diameter section 3216. The first shaft diameter section 3214 of the piston 321 can be in sliding fit with the inner cylinder 324. The second shaft diameter section 3215 of the piston 321 can be in sliding fit with the outer cylinder 323. The third shaft diameter section 3216 of the piston 321 can be in sliding fit with the bushing 326. A first stroke air chamber 327 can be formed between the first shaft diameter section 3214 of the piston 321 and the outer cylinder 323.

[0037] An inner wall of one end of the outer cylinder 323 close to the air distribution seat 325 is provided with a first annular groove 3231; an inner cylinder 324 is provided with a first wall hole 3241 between the chamber 3256 and the first annular groove 3231, and the first wall hole 3241 can communicate the chamber 3256 and the first annular groove 3231; the inner cylinder 324 is provided with a second wall hole 3242 between the first annular groove 3231 and the first shaft diameter section 3214 of the piston 321. In this way, the air distribution through hole 3257, the chamber 3256, the first wall hole 3241, the first annular groove 3231, and the second wall hole 3242 can form the first air guiding channel.

[0038] The variable displacement air guiding channel can be a wall groove 3217 axially formed on the outer wall of the piston 321 from the first shaft diameter section 3214 towards the second shaft diameter section 3215. For example, the wall groove 3217 can extend from a first preset position of the first shaft diameter section 3214 to a second preset position of the second shaft diameter section 3215. The variable displacement air guiding channel is in communication with the first stroke air chamber 327 and is also in communication with the second wall hole 3242. In this way, the variable displacement air guiding channel can be in communication with the first air guiding channel, enabling compressed air to enter the first stroke air chamber 327 to generate an air pressure acting force on the piston 321 towards the drill bit 40.

[0039] The second air guiding channel can be a second annular groove 3232 formed on the inner wall of the outer cylinder 323 corresponding to the second shaft diameter section 3215 of the piston 321. Due to the reciprocating movement of the piston 321, when the piston 321 moves to a corresponding position, the wall groove 3217 provided on the outer wall of the piston 321 can be in communication with the second annular groove 3232, that is, the variable displacement air guiding channel is in communication with the second air guiding channel. And since the variable displacement air guiding channel is in communication with the first stroke air chamber 327, the second air guiding channel can then be in communication with the first stroke air chamber 327. In addition, the third shaft diameter section 3216 of the piston 321 can extend into the inner cavity of the bushing 326, so that a return stroke air chamber 328 can be formed among the piston 321, the outer cylinder 323, and the bushing 326, and the second air guiding channel can be in communication with the return stroke air chamber 328, enabling compressed air to enter the return stroke air chamber 328 to generate an air pressure acting force on the piston 321 away from the drill bit 40.

[0040] The second stroke air chamber 329 can be formed between the piston 321 and the air distribution seat 325. For example, the piston 321 is axially provided with a perforation, the rod body 3255 of the air distribution seat 325 can extend into this perforation, the first shaft diameter section 3214 of the piston 321 is in sliding fit with the inner cylinder 324, and the second disc body 3254 of the air distribution seat 325 passes through the inner cylinder 324. In this way, when the piston 321 moves to a corresponding position, the rod body 3255 extends into the perforation, and a second stroke air chamber 329 can be formed between the air distribution seat 325 and the piston 321. In addition, an inner groove 3243 is axially formed on the inner wall of the inner cylinder 324, and this inner groove 3243 is in communication with the second stroke air chamber 329. When the piston 321 moves to a corresponding position, the wall groove 3217 of the piston 321 can be in communication with the inner groove 3243 of the inner cylinder 324, that is, the variable displacement air guiding channel is in communication with the second stroke air chamber 329, and the wall groove 3217 of the piston 321 is disconnected from the second annular groove 3232. Also, since the variable displacement air guiding channel is in communication with the first air guiding channel, compressed air can enter the second stroke air chamber 329 to generate an air pressure acting force on the piston 321 towards the drill bit 40.

[0041] Optionally, in an embodiment of the present application, as Figure 1 、 Figure 2As shown, a first stroke thrust surface 3211 is formed on the piston 321 within the first stroke air chamber 327; a return stroke thrust surface 3212 is formed on the piston 321 within the return stroke air chamber 328; a second stroke thrust surface 3213 is formed on the piston 321 within the second stroke air chamber 329; wherein, the area of the first stroke thrust surface 3211 is smaller than the area of the return stroke thrust surface 3212. For example, in the present application, a first stroke thrust surface 3211 for applying an air pressure acting force in the direction towards the drill bit 40 to the piston 321 is formed on the piston 321 within the first stroke air chamber 327; a return stroke thrust surface 3212 for applying an air pressure acting force in the direction away from the drill bit 40 to the piston 321 is formed on the piston 321 within the return stroke air chamber 328; a second stroke thrust surface 3213 for applying an air pressure acting force in the direction towards the drill bit 40 to the piston 321 is formed on the piston 321 within the second stroke air chamber 329; wherein, the area of the first stroke thrust surface 3211 is smaller than the area of the return stroke thrust surface 3212.

[0042] In this embodiment, the piston 321 is configured in the shape of a stepped shaft, and the outer diameter of the first shaft diameter section 3214 is smaller than the outer diameter of the second shaft diameter section 3215. Therefore, within the first stroke air chamber 327, the shoulder of the second shaft diameter section 3215 close to the first shaft diameter section 3214 can form the first stroke thrust surface 3211 for applying an air pressure acting force in the direction towards the drill bit 40 to the piston 321. The outer diameter of the third shaft diameter section 3216 is smaller than the outer diameter of the second shaft diameter section 3215. Therefore, within the return stroke air chamber 328, the shoulder of the second shaft diameter section 3215 close to the third shaft diameter section 3216 can form the return stroke thrust surface 3212 for applying an air pressure acting force in the direction away from the drill bit 40 to the piston 321. The first stroke thrust surface 3211 and the return stroke thrust surface 3212 can be respectively annular. The outer diameter of the third shaft diameter section 3216 is smaller than the outer diameter of the first shaft diameter section 3214, so the area of the first stroke thrust surface 3211 is smaller than the area of the return stroke thrust surface 3212. When the rod body 3255 of the air distribution seat 325 extends into the perforation of the piston 321 as the piston 321 moves, the first shaft diameter section 3214 of the piston 321 is in sliding fit with the inner cylinder 324, and the second disc body 3254 of the air distribution seat 325 passes through the inner cylinder 324. Within the formed second stroke air chamber 329, the first end face of the piston 321 can form the second stroke thrust surface 3213 for applying an air pressure acting force in the direction towards the drill bit 40 to the piston 321.

[0043] Based on the above flow channel design of the impactor 32, its working process is as follows: When the impactor 32 is in a vertical or upright state, the second end of the piston 321 contacts the tail of the drill bit 40. At this time, the second end of the piston 321 extends into the inner cavity of the bushing 326, and a return air chamber 328 is formed among the piston 321, the outer cylinder 323, and the bushing 326. Compressed air enters the air inlet hole 21 of the air storage member 20 through the air flow channel 11 of the joint 10 and flows respectively to a plurality of air outlet holes 22 through a plurality of air distribution channels 23 of the air storage member 20. Under the action of air pressure, the check valve 322 elastically abutted against the first diameter hole of the air outlet hole 22 is pushed open. Then the compressed air flows through the first air guide channel, that is, from the air distribution through hole 3257 of the first disk body 3253 of the air distribution seat 325, and enters the chamber 3256 between the first disk body 3253, the second disk body 3254, and the inner cylinder 324; then the compressed air continues to flow through the first wall hole 3241 of the inner cylinder 324, the first annular groove 3231 of the outer cylinder 323, and the second wall hole 3242 of the inner cylinder 324; the wall groove 3217 of the piston 321 is communicated with the second wall hole 3242, and in the position state of the piston 321 at this time, the wall groove 3217 of the piston 321 is communicated with the second annular groove 3232 of the outer cylinder 323, that is, the displacement air guide channel is communicated with the second air guide channel, and the second air guide channel is communicated with the return air chamber 328, so that the compressed air enters the return air chamber 328; and in the position state of the piston 321, the wall groove 3217 of the piston 321 is not communicated with the inner groove 3243 of the inner cylinder 324, and the rod body 3255 of the air distribution seat 325 does not extend into the through hole of the piston 321. Since the area of the first stroke thrust surface 3211 of the piston 321 in the first stroke air chamber 327 is smaller than the area of the return stroke thrust surface 3212 of the piston 321 in the return air chamber 328, the air pressure acting force received by the return stroke thrust surface 3212 is greater than the air pressure acting force received by the first stroke thrust surface 3211, and the piston 321 moves in a direction away from the drill bit 40.

[0044] After the second end of the piston 321 disengages from the bushing 326, the compressed air in the return air chamber 328 blows the debris at the bottom of the hole through the through hole of the bushing 326 and the drill bit 40 that penetrates both ends. At the same time, due to the reverse of the acting force, the piston 321 decelerates. The first stroke thrust surface 3211 of the piston 321 in the first stroke air chamber 327 forms a decelerating effect on the piston 321 under the action of air pressure. When the rod body 3255 of the air distribution seat 325 extends into the perforation of the piston 321 as the piston 321 moves, since the first shaft diameter section 3214 of the piston 321 is slidably engaged with the inner cylinder 324 and the second disk body 3254 of the air distribution seat 325 is inserted into the inner cylinder 324, a second stroke air chamber 329 is formed between the piston 321 and the air distribution seat 325. In this position state of the piston 321, the wall groove 3217 of the piston 321 is connected to the inner groove 3243 of the inner cylinder 324, that is, the displacement air guiding channel is connected to the second stroke air chamber 329, and the wall groove 3217 of the piston 321 is connected to the second wall hole 3242, that is, the displacement air guiding channel is connected to the first air guiding channel, so that the second stroke air chamber 329 is connected to the first air guiding channel, and the compressed air enters the second stroke air chamber 329 through the first air guiding channel; at the same time, since the displacement air guiding channel is connected to the first stroke air chamber 327, the compressed air enters the first stroke air chamber 327 through the first air guiding channel. At this time, the second stroke thrust surface 3213 formed by the first end end surface of the piston 321 in the second stroke air chamber 329 and the first stroke thrust surface 3211 of the piston 321 in the first stroke air chamber 327 jointly receive the air pressure acting force in the direction of the drill bit 40, so that the stroke force received by the piston 321 reaches the maximum, and the force receiving area is the sum of the areas of the second stroke thrust surface 3213 and the first stroke thrust surface 3211, so that the piston 321 stops returning and accelerates to impact the tail of the drill bit 40 forward. The piston 321 reciprocates in this way to impact the drill bit 40, thereby achieving the rock breaking effect.

[0045] It should be noted that there can be various flow channel design structures of the impactor 32 to enable the piston 321 to reciprocate under the action of air pressure. In this application, a specific embodiment is given above. Those skilled in the art can design and modify the specific structure and its usage mode within the scope of this application according to the on-site construction situation.

[0046] During the operation of the impactor 32, it mainly relies on the formation of different air pressure differences by compressed air inside the impactor 32 to push the piston 321 to reciprocate, impact the tail of the drill bit 40, and transmit the impact energy to crush and roll the rock. When the impactor 32 has been working for a long time, the air distribution seat 325, the inner cylinder 324, the outer cylinder 323, the piston 321, and the bushing 326 are all worn to a certain extent, resulting in too large a movement gap, which will cause weak impact and low drilling efficiency. To ensure reliable operation, in this embodiment, the clearance between the air distribution seat 325 and the piston 321 is ≤0.25 mm, the clearance between the inner cylinder 324 and the piston 321 is ≤0.25 mm, the clearance between the piston 321 and the outer cylinder 323 is ≤0.25 mm, and the clearance between the piston 321 and the bushing 326 is ≤0.38 mm.

[0047] Optionally, in an embodiment of the present application, as Figure 2 shown, the air distribution seat 325 is provided with a groove 3251 on the side close to the air storage member 20. The first end of the impactor 32 is also provided with a check valve 322. One end of the check valve 322 passes through the groove 3251. An elastic member 3252 is arranged in the groove 3251. The two ends of the elastic member 3252 respectively abut against the air distribution seat 325 and the check valve 322, so that the other end of the check valve 322 can elastically abut against the air outlet hole 22. The elastic member 3252 can be a cylindrical spring or the like, so that the check valve 322 can elastically abut against the air outlet hole 22. When the down-the-hole hammer 100 works, the pressure of the compressed air is greater than the elastic force of the elastic member 3252, and the check valve 322 can be pushed open and flow out from the orifice of the air outlet hole 22, so that the piston 321 of the impactor 32 can reciprocate under the action of air pressure; when the down-the-hole hammer 100 stops working, the check valve 322 blocks the orifice of the air outlet hole 22 to prevent foreign matters from flowing back.

[0048] Optionally, in an embodiment of the present application, as Figure 1 shown, it further includes a guide 50. The guide 50 is connected to the second end of the impact seat 30. The guide 50 is provided with a plurality of guide holes 51, and each guide hole 51 corresponds to an impact chamber 31; the drill bit 40 passes through the guide holes 51. The guide 50 is connected to the second end of the impact seat 30. Specifically, a flange or flange structure can also be provided at the second end of the impact seat 30 and connected to the corresponding position of the guide 50 by bolts. As Figures 8 - 10As shown, a plurality of guiding holes 51 can be evenly distributed around the axis of the guide 50. To ensure that the second end of the guide 50 and the impact seat 30 can be accurately positioned for connection and combination, a convex body can be provided on the end face of the end of the guide 50 close to the impact seat 30, and a concave body can be provided at the corresponding position of the second end of the impact seat 30, or a concave body can be provided on the end face of the end of the guide 50 close to the impact seat 30, and a convex body can be provided at the corresponding position of the second end of the impact seat 30. The convex body and the concave body can be adapted and engaged to facilitate installation and positioning, and facilitate the assembly and disassembly of the guide 50 and the impact seat 30. For example, in this embodiment, a plurality of impact seat convex bodies 36 are provided around the axis at the second end of the impact seat 30, and a plurality of guide concave bodies 57 are provided around the axis at the end of the guide 50 close to the impact seat 30. In addition, between the end face of the second end of the guide 50 and the impact seat 30, at the position corresponding to the orifice of the impact chamber 31, a seal can be further provided to improve the airtightness between the second end of the guide 50 and the impact seat 30.

[0049] Optionally, in an embodiment of the present application, as Figure 11 shown, a first polyhedron is formed on the outer wall of the drill bit 40. A kit 52 is provided in the guiding hole 51. The kit 52 has an inner wall adapted to the first polyhedron. A second polyhedron is formed on the outer wall of the kit 52. The guiding hole 51 has an inner wall adapted to the second polyhedron. For example, the first polyhedron on the outer wall of the drill bit 40 can be a hexahedron, the kit 52 can specifically be a matching hexagonal sleeve, and the second polyhedron on the inner wall of the guiding hole 51 is also a hexahedron. In this way, the kit 52 is convenient for providing a rotational torque for the rotation of the drill bit 40 and preventing the drill bit 40 from slipping. In addition, the kit 52 is in frictional contact with the drill bit 40, which is beneficial to extending the service life of the guide 50.

[0050] Optionally, in an embodiment of the present application, as Figure 8 、 Figure 9 shown, a plurality of convex platforms 53 are provided circumferentially at the end of the guide 50 facing away from the impact seat 30. A guide radial slag discharge groove 54 is formed in the top end face of the convex platform 53 along the radial direction of the guide 50. The convex platform 53 can play a guiding role for the installation of the drill bit 40 and prevent the drill bit 40 from being incorrectly installed. In addition, an arc-shaped guide radial slag discharge groove 54 can be provided on the convex platform 53 to facilitate the discharge of the slag and waste soil after the drill bit 40 is broken.

[0051] Optionally, in an embodiment of the present application, as Figure 12 、 Figure 13As shown, the drill bit 40 has a through hole penetrating both ends. The head end face of the drill bit 40 is provided with a radial slag discharge groove 401 along the radial direction of the drill bit 40. An arc-shaped structure 402 is formed at the head of the drill bit 40. The arc-shaped structures 402 of multiple drill bits 40 configured on the down-the-hole hammer 100 are arranged concentrically. The head of the drill bit 40 can be designed to be irregular, forming an arc-shaped structure 402. After multiple drill bits 40 are installed on the down-the-hole hammer 100, the arc-shaped structures 402 of each drill bit 40 are arranged concentrically, and can be combined into a quasi-circular or quasi-spherical shape, which can effectively break rocks. In addition, the drill bit 40 has a through hole penetrating both ends, which is convenient for guiding compressed air to blow slag at the bottom of the hole. The radial slag discharge groove 401 provided at the head of the drill bit 40 can further help guide compressed air to wash the bottom of the hole, so as to keep the surface of the drill bit 40 in direct contact with the un-drilled rock formation, thereby increasing the drilling speed.

[0052] In order to further facilitate the discharge of slag, waste soil, and rock debris at the bottom of the hole, prevent repeated crushing, and improve work efficiency, optionally, in an embodiment of the present application, an axial slag discharge groove 24 is provided on the outer wall of the air storage member 20 along the axial direction of the air storage member 20; and / or an axial slag discharge groove 33 is provided on the outer wall of the impact seat 30 along the axial direction of the impact seat 30; and / or an axial slag discharge groove 55 is provided on the outer wall of the guide 50 along the axial direction of the guide 50. Multiple arc-shaped axial slag discharge grooves can be respectively provided on the outer walls of the air storage member 20, the impact seat 30, and the guide 50 along the axial direction. For example, six axially slag discharge grooves 24 evenly distributed around the circumference are provided on the outer wall of the air storage member 20, six axially slag discharge grooves 33 evenly distributed around the circumference are provided on the outer wall of the impact seat 30, and six axially slag discharge grooves 55 evenly distributed around the circumference are provided on the outer wall of the guide 50. When assembling the down-the-hole hammer 100, the axial slag discharge grooves 24, the axial slag discharge grooves 33, and the axial slag discharge grooves 55 are aligned axially one by one, so as to form a discharge channel for rock slag on the outer wall of the down-the-hole hammer 100, which is beneficial to the discharge of slag, waste soil, and rock debris at the bottom of the hole, prevents repeated crushing, and improves work efficiency.

[0053] In order to improve the sealing performance, a sealing groove can be provided at the position of the orifice of the impact chamber 31 on the first end face of the impact seat 30 and a sealing member can be provided, and / or a sealing groove can be provided on the end face of the air distribution seat 325 near the air outlet hole 22 and a sealing member can be provided, so as to further prevent compressed air from leaking between the second end of the air storage member 20 and the first end of the impact seat 30. In addition, a snap ring 3233 can be installed on the inner wall of the outer cylinder 323 to form an axial limiting structure; a washer 34 can be installed on the inner wall of the impact chamber 31 at the second end of the impact seat 30 to form an axial limiting structure for components such as the outer cylinder 323 and the bushing 326; a snap ring 56 can be installed on the inner wall of the guide hole 51 at the first end of the guide 50 to form an axial limiting structure.

[0054] In addition, in some embodiments of the present application, the down-the-hole hammer 100 can also be configured such that multiple impactors 32 can reciprocate asynchronously under the action of air pressure, so that the multiple impactors 32 impact the corresponding drill bits 40 at different times respectively. In this way, the multiple drill bits 40 can apply crushing forces to the drilling positions dispersedly, enhancing the crushing effect on the rock and thus further improving the construction efficiency.

[0055] The down-the-hole hammer 100 of this embodiment successfully integrates the technical advantages of small rock drilling tools, reduces the cost of large-diameter drilling equipment, and improves the construction efficiency and adaptability at the same time. The modular design of the down-the-hole hammer 100 not only improves the convenience of maintenance, but also enhances the equipment's adaptability and can meet different engineering requirements.

[0056] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected and the relative position relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present application, such as "upper", "lower", "inner", "outer", etc., are only with reference to the direction of the attached drawings. Therefore, the orientation terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present application. "Multiple" means at least two.

[0057] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of such features.

[0058] In the embodiments of the present application, "and / or" is merely a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0059] Reference to "one embodiment" or "some embodiments" or the like described in this specification means that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in some other embodiments", "in another embodiment", etc., which appear in different places in this specification, do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized.

[0060] The above has described in detail the embodiments of the present application. Those skilled in the art can design and modify the device and its usage mode within the scope of the present application according to the on-site construction situation.

[0061] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0062] The above are only the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A down-the-hole hammer, characterized in that: include: A joint, the joint is used to connect the drill pipe, and the joint is provided with an air flow channel; An air storage member, the air storage member is connected to the joint, the air storage member is provided with an air inlet and a plurality of air outlets connected to the air inlet, and the air inlet is connected to the air flow channel; An impact seat, the impact seat is connected to the gas storage member, and a sealing member is provided between the impact seat and the gas storage member; the impact seat is provided with a plurality of impact chambers and a plurality of impactors; each of the impact chambers corresponds to one of the gas outlets; each of the impactors is arranged in one of the impact chambers; wherein the impactor comprises a piston, and the piston can reciprocate under the action of gas pressure; A drill bit, wherein there are multiple drill bits, each of which is arranged at an end of the impactor away from the air storage member, so that the piston of the impactor can impact the drill bit during the reciprocating motion.

2. The down-the-hole hammer according to claim 1, characterized in that: The impactor also includes a piston cavity, the piston is inserted into the piston cavity, and the piston cavity can be communicated with the air outlet so that the piston can reciprocate under the action of air pressure.

3. The down-the-hole hammer according to claim 1, characterized in that: The first end of the gas storage member is connected to the joint, and the first end of the gas storage member is provided with the gas inlet hole; the second end of the gas storage member is connected to the first end of the impact seat, and the second end of the gas storage member is provided with the plurality of gas outlet holes, and a gas distribution channel is provided between each of the gas outlet holes and the gas inlet hole to communicate with each other; and / or The air outlet hole is a stepped hole, and the air outlet hole includes a first diameter hole and a second diameter hole. The inner diameter of the first diameter hole is smaller than the inner diameter of the second diameter hole. The air separation channel connects the first diameter hole and the air inlet hole. The first end of the impactor is also provided with a check valve, and the check valve can elastically abut against the orifice of the first diameter hole.

4. The down-the-hole hammer according to claim 2, characterized in that: The impactor also includes an outer cylinder, an inner cylinder, a valve seat and a bushing; the outer cylinder is inserted into the impact chamber, the inner cylinder is inserted into the first end of the outer cylinder, the bushing is inserted into the second end of the outer cylinder, the valve seat is inserted into the inner cylinder, and the outer cylinder, the inner cylinder, the valve seat and the bushing form the piston chamber.

5. The down-the-hole hammer according to claim 1, characterized in that: The impactor is formed with a first stroke air chamber, a second stroke air chamber, and a return air chamber; the impactor is also formed with a first air guide channel, a displacement air guide channel, and a second air guide channel; The first air guide channel can be connected to the air outlet; The shifting air guiding channel is in communication with the first air guiding channel, the shifting air guiding channel is in communication with the first stroke air chamber, and the shifting air guiding channel can be in communication with the second stroke air chamber; The second air guiding channel can be communicated with the displacement air guiding channel, and the second air guiding channel can be communicated with the return air chamber.

6. The down-the-hole hammer according to claim 5, characterized in that: The piston forms a first stroke thrust surface in the first stroke air chamber; The piston forms a return thrust surface in the return air chamber; The piston forms a second stroke thrust surface in the second stroke air chamber; Wherein, the area of ​​the first stroke thrust surface is smaller than the area of ​​the return thrust surface.

7. The down-the-hole hammer according to claim 4, characterized in that: The gas distribution seat is provided with a groove on a side close to the gas storage member, and the first end of the impactor is also provided with a check valve, one end of the check valve is inserted into the groove, and an elastic member is provided in the groove, and the two ends of the elastic member are respectively abutted against the gas distribution seat and the check valve, so that the other end of the check valve can elastically abut against the air outlet.

8. The down-the-hole hammer according to claim 7, characterized in that: It also includes a guide, which is connected to the second end of the impact seat. The guide is provided with a plurality of guide holes, each of which corresponds to an impact cavity; and the drill bit is inserted into the guide hole.

9. The down-the-hole hammer according to claim 8, characterized in that: The outer wall of the drill bit forms a first polyhedron, a sleeve is arranged in the guide hole, the sleeve has an inner wall adapted to the first polyhedron, the outer wall of the sleeve forms a second polyhedron, and the guide hole has an inner wall adapted to the second polyhedron.

10. The down-the-hole hammer according to claim 8, characterized in that: An outer wall of the gas storage member is provided with an axial slag discharge groove of the gas storage member along the axial direction of the gas storage member; and / or An outer wall of the impact seat is provided with an impact seat axial slag discharge groove along the axial direction of the impact seat; and / or The outer wall of the guide is provided with an axial slag discharge groove of the guide along the axial direction of the guide; and / or The guide is provided with a plurality of bosses along the circumferential direction at one end away from the impact seat, and the top end surface of the boss is provided with a radial slag discharge groove of the guide along the radial direction of the guide; and / or The drill bit has through holes passing through both ends, the end face of the drill bit head is provided with a drill bit radial slag discharge groove along the radial direction of the drill bit, the drill bit head forms an arc structure, and the arc structures of the multiple drill bits configured by the down-the-hole hammer are arranged co-centrically.

Images