Down-hole hammer

Abstract

The embodiment of the utility model discloses a down-the-hole hammer, relates to the field of engineering machinery, and can effectively improve the construction efficiency and reduce the construction cost. 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 air storage part is connected to the connector, 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, 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 field of engineering machinery, specifically to a down-the-hole hammer. Background Technology

[0002] Over the past two decades, my country's accelerated industrialization and the transfer of global manufacturing to the country have made the exploration, development, and supply of mineral resources a crucial condition for the sustained, stable, and rapid development of the national economy. However, with economic development, proven high-quality mineral resources are nearing depletion, making green backfilling mining a current trend. In the process of green backfilling mining, the requirements for the construction of building pile foundations and backfilling boreholes are becoming increasingly stringent. These projects place higher demands on efficient, stable, and reliable pile foundation drilling and backfilling borehole equipment. Against this backdrop, pile foundation construction and backfilling borehole equipment face severe challenges, requiring not only high-efficiency construction but also low energy consumption, low maintenance, and high stability to meet the needs of modern engineering projects.

[0003] However, traditional large-scale pile foundation construction and filling drilling equipment generally suffers from problems such as long construction cycles, high energy consumption, high costs, and frequent maintenance. Especially in environments such as mining, traditional equipment faces high-intensity rock breaking requirements, often leading to excessive equipment load, increased energy consumption, and wear. Simultaneously, due to frequent equipment use and harsh operating environments, the cost of equipment maintenance and replacement is high, further restricting its widespread application in heavy-load environments such as mines. Therefore, traditional equipment is gradually failing to meet the requirements of modern engineering in terms of efficiency, energy saving, environmental protection, and cost control.

[0004] Meanwhile, conventional small rock drilling tools have been widely used in daily engineering projects due to their mature technology and low cost, especially in some small projects, where they have demonstrated good cost performance and construction results. These small devices have advantages such as high flexibility, convenient operation, and controllable cost, but due to their limited working capacity, they often cannot meet the needs of large-diameter pile foundation holes, filling boreholes, mine ventilation holes, etc.

[0005] Therefore, there is an urgent need to address the shortcomings of traditional equipment in modern engineering and to develop a new type of high-efficiency pile foundation drilling equipment by utilizing the mature technology of small rock drilling tools to meet increasingly stringent engineering requirements. Utility Model Content

[0006] In view of this, this application provides a down-the-hole hammer that can effectively improve construction efficiency and reduce construction costs.

[0007] In a first aspect, embodiments of this application provide a down-the-hole hammer, comprising: a connector for connecting a drill rod, the connector having an airflow channel; an air storage unit connected to the connector, the air storage unit having an air inlet and a plurality of air outlets communicating with the air inlet, the air inlet communicating with the airflow channel; an impact seat connected to the air storage unit, the impact seat having a plurality of impact chambers and a plurality of impactors; each impact chamber corresponding to an air outlet; each impactor disposed within an impact chamber; wherein, the impactor includes a piston capable of reciprocating under air pressure; and a plurality of drill bits, each drill bit disposed at an end of an impactor away from the air storage unit, so that the piston of the impactor can impact the drill bit during reciprocating motion.

[0008] In one specific implementation, the impactor further includes a piston chamber, in which the piston passes through and is connected to the air outlet, so that the piston can reciprocate under air pressure.

[0009] In one specific implementation, the first end of the gas storage component is connected to the connector, and the first end of the gas storage component has an air inlet; the second end of the gas storage component is connected to the first end of the impact seat, and the second end of the gas storage component has a plurality of air outlets, and each air outlet is provided with an air distribution channel to communicate with the air inlet; and / or the air outlet is a stepped hole, the air outlet 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 air distribution channel connects the first diameter hole and the air inlet; the first end of the impactor is also provided with a check valve, the check valve can elastically abut against the opening of the first diameter hole.

[0010] In one specific embodiment, the impactor further includes an outer cylinder, an inner cylinder, a valve seat, and a bushing; the outer cylinder passes through the impact chamber, the inner cylinder passes through a first end of the outer cylinder, the bushing passes through a second end of the outer cylinder, and the valve seat passes through the inner cylinder; the outer cylinder, the inner cylinder, the valve seat, and the bushing form the piston chamber; the impactor has a first-stroke air chamber and a second-stroke air chamber for applying a pneumatic force to the piston in the direction of the drill bit, and a force for applying a counter-pressure to the piston. The return air chamber is formed by the air pressure force in the direction of the drill bit; the impactor also forms 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 displacement air guide channel is connected to the first air guide channel and the first stroke air chamber, and the displacement air guide channel can be connected to the second stroke air chamber; the second air guide channel can be connected to the displacement air guide channel and the second air guide channel can be connected to the return air chamber.

[0011] In one specific implementation, the piston has a first-stroke thrust surface in the first-stroke chamber for applying a pneumatic force toward the drill bit; the piston has a return thrust surface in the return chamber for applying a pneumatic force away from the drill bit; and the piston has a second-stroke thrust surface in the second-stroke chamber for applying a pneumatic force toward the drill bit; wherein the area of ​​the first-stroke thrust surface is smaller than the area of ​​the return thrust surface.

[0012] In one specific implementation, the gas distribution seat has a groove on the side near the gas storage component, and the first end of the impactor is also provided with a check valve. One end of the check valve passes through the groove, and an elastic element is provided in the groove. The two ends of the elastic element abut against the gas distribution seat and the check valve, respectively, so that the other end of the check valve can elastically abut against the gas outlet.

[0013] In one specific implementation, a guide is further included, which is connected to the second end of the impact seat. The guide has a plurality of guide holes, each of which corresponds to one of the impact chambers. The drill bit passes through the guide holes.

[0014] In one specific implementation, the outer wall of the drill bit is formed with a first polyhedron, a kit is provided in the guide hole, the kit has an inner wall adapted to the first polyhedron, the outer wall of the kit is formed with a second polyhedron, and the guide hole has an inner wall adapted to the second polyhedron.

[0015] In one specific implementation, the outer wall of the gas storage component is provided with an axial slag discharge groove along the axial direction of the gas storage component; and / or the outer wall of the impact seat is provided with an 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 along the axial direction of the guide; and / or the guide is provided with a plurality of protrusions circumferentially at one end away from the impact seat, and the top end face of the protrusion is provided with a radial slag discharge groove along the radial direction of the guide.

[0016] In one specific implementation, the drill bit has a through hole extending through both ends, and a radial slag discharge groove is formed on the head end face of the drill bit along the radial direction of the drill bit. The head of the drill bit forms an arc-shaped structure, and the arc-shaped structures of the multiple drill bits configured in the down-the-hole hammer are arranged with the same center.

[0017] The down-the-hole hammer provided in this application includes: a connector, an air reservoir, an impact seat, and drill bits. The connector is used to connect to the drill rod and has an airflow channel. The air reservoir is connected to the connector and has an air inlet and multiple air outlets communicating with the air inlet, which are connected to the airflow channel. The impact seat is connected to the air reservoir and has multiple impact chambers and multiple impactors. Each impact chamber corresponds to an air outlet. Each impactor is disposed within an impact chamber. Each impactor includes a piston that can reciprocate under air pressure. Multiple drill bits are provided, each disposed at the end of an impactor away from the air reservoir, so that the piston of the impactor can impact the drill bit during its reciprocating motion. This down-the-hole hammer can effectively improve construction efficiency and reduce construction costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a down-the-hole hammer provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of an impactor for a down-the-hole hammer provided in an embodiment of this application;

[0021] Figure 3 A right-side view of the gas storage component of a down-the-hole hammer provided in an embodiment of this application;

[0022] Figure 4 A schematic cross-sectional view of a gas storage component for a down-the-hole hammer provided in this application embodiment;

[0023] Figure 5 A left-side view of the gas storage component of a down-the-hole hammer provided in an embodiment of this application;

[0024] Figure 6 A schematic diagram of an impact seat for a down-the-hole hammer provided in an embodiment of this application;

[0025] Figure 7 A schematic cross-sectional view of the impact seat of a down-the-hole hammer provided in an embodiment of this application;

[0026] Figure 8 A right-side view of a guide for a down-the-hole hammer provided in an embodiment of this application;

[0027] Figure 9 A schematic cross-sectional view of a guide for a down-the-hole hammer provided in an embodiment of this application;

[0028] Figure 10 A left-side view of a guide for a down-the-hole hammer provided in an embodiment of this application;

[0029] Figure 11 A schematic diagram of a drill bit for a down-the-hole hammer provided in an embodiment of this application;

[0030] Figure 12 This is a right-side view of a drill bit for a down-the-hole hammer, provided as an embodiment of this application.

[0031] Figure 13 This is a schematic cross-sectional view of a drill bit for a down-the-hole hammer provided in an embodiment of this application.

[0032] Explanation of key figure labels:

[0033] 100-Down-the-hole hammer; 10-Connector; 11-Airflow channel; 20-Air storage component; 21-Air inlet; 22-Air outlet; 23-Air distribution channel; 24-Axial slag discharge groove of air storage component; 25-Air storage component protrusion; 30-Impact seat; 31-Impact chamber; 32-Impacter; 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 Hole; 3243-Inner groove; 325-Gas distribution seat; 3251-Groove; 3252-Elastic element; 3253-First disc body; 3254-Second disc body; 3255-Rod body; 3256-Inter-disc chamber; 3257-Gas distribution through hole; 326-Bushing; 327-First stroke air chamber; 328-Return air chamber; 329-Second stroke air chamber; 33-Impact seat axial slag discharge groove; 34-Washer; 35-Impact seat recess; 36-Impact seat protrusion; 40-Drill bit; 401-Drill bit radial slag discharge groove; 402-Arc-shaped structure; 50-Guide; 51-Guide hole; 52-Kit; 53-Boss; 54-Guide radial slag discharge groove; 55-Guide axial slag discharge groove; 56-Snap ring; 57-Guide recess. Detailed Implementation

[0034] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0035] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0036] Traditional large-scale pile foundation construction equipment generally suffers from problems such as long construction cycles, high energy consumption, high costs, and frequent maintenance, which restricts its widespread application in heavy-load environments such as mines. Meanwhile, conventional small rock drilling tools, due to their mature technology and low cost, have been widely used in daily engineering projects. These small devices offer advantages such as high flexibility, ease of operation, and controllable costs; however, their limited working capacity often fails to meet the needs of large-diameter pile foundation holes. To address the shortcomings of traditional equipment under modern engineering requirements, and to 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 connector 10, an air storage component 20, an impact seat 30, and a drill bit 40.

[0037] The connector 10 is used to connect the drill pipe, and the connector 10 is provided with an airflow channel 11. For example, the outer wall of the first end of the connector 10 can be configured as a hexagonal prism structure to facilitate quick engagement with the drill pipe, and the second end of the connector 10 can be provided with an external thread structure so that it can be connected to the corresponding threaded hole on the air storage component 20. The connector 10 can be provided with an airflow channel 11 extending through both ends along the axial direction. Compressed air provided by the air compressor can be supplied to the air storage component 20 with high-pressure gas through the airflow channel 11.

[0038] The gas storage component 20 is connected to the connector 10. The gas storage component 20 is provided with an air inlet 21 and a plurality of air outlets 22 communicating with the air inlet 21. The air inlet 21 is connected to the airflow channel 11. In this embodiment, the volume of the air inlet 21 of the gas storage component 20 can be larger than the volume of the air outlets 22, so that the air inlet 21 can supply gas to each air outlet 22 more stably. In addition, it can form a storage space for the gas delivered from the airflow channel 11 of the connector 10, thereby improving the stability of gas transmission. The gas storage component 20 is equipped with multiple air outlets 22, which can be evenly distributed around the axial direction of the gas storage component 20. Each air outlet 22 can impact one of the drill bits 40 through the impact seat 30 to break the rock. For example, if the gas storage component 20 is equipped with two air outlets 22, it can impact two drill bits 40. If the gas storage component 20 is equipped with three air outlets 22, it can impact three drill bits 40. When the gas storage component 20 is equipped with n air outlets 22, it can impact n drill bits 40, thereby forming a clustered down-the-hole hammer 100.

[0039] The impact seat 30 is connected to the gas storage component 20. The impact seat 30 is provided with multiple impact chambers 31 and multiple impactors 32; each impact chamber 31 corresponds to an air outlet 22; each impactor 32 is disposed within an impact chamber 31; wherein, for example Figure 2 As shown, the impactor 32 includes a piston 321, which can reciprocate under air pressure. The number of impact chambers 31 provided in the impact seat 30 corresponds to the number of air outlets 22, and the multiple impact chambers 31 can be evenly distributed around the axial direction of the impact seat 30. The impactor 32 is provided in the impact chamber 31, and the impactor 32 is equipped with the piston 321. In this way, by switching the air supply channel, the piston 321 can reciprocate under air pressure. During the reciprocating motion of the piston 321, it can impact the corresponding drill bit 40, generating a strong impact force, thereby breaking the rock.

[0040] Multiple drill bits 40 are present, each positioned at the end of an impactor 32 furthest from the air reservoir 20, so that the piston 321 of the impactor 32 impacts the drill bit 40 during reciprocating motion. The drill bit 40 transmits impact energy to break rocks. The drill rod drives the down-the-hole hammer 100 and the drill bit 40, and the tail of the drill bit 40, under the impact of the piston 321, causes the head of the drill bit 40 to break rocks. Specifically, during operation, the drill rod rotates, and under the axial pressure of the hydraulic system, the drill bit 40 rotates and shears, breaking the rock surface. The down-the-hole hammer 100 primarily uses impact to break rocks, supplemented by rotational rock breaking. The impact load creates a fracture pit, and the rotational torque effectively cuts the fan-shaped portion between the fracture pits. Due to the sudden impact, local stress concentration occurs, and the rock reaches its strength limit value before redistribution, resulting in brittle fracture. Simultaneously, the rotational force shears the rock on the raised ridges, causing the rock to separate into large particles; thus, a combined effect of impact breaking and rotational cutting is achieved. In this embodiment, the weight of the drill bit 40 can be designed to be close to that of the piston 321 to improve the efficiency of impact energy transmission. The drill bit 40 bears a large dynamic load and friction, therefore it can be designed with high surface hardness, high wear resistance, and high impact resistance. The drill bit 40 can be of the cutting edge type, cylindrical tooth type, or ball tooth type, etc., and this embodiment is not limited to these. Furthermore, the drill bit 40 can be configured with a channel for compressed air to pass through, such as through holes at both ends of the drill bit 40, to discharge the rock cutting debris generated during cutting out of the hole through the slag discharge channel.

[0041] The down-the-hole hammer 100 is equipped with multiple drill bits 40, which are evenly distributed around the axial direction of the hammer. Each impactor 32 acts on one drill bit 40, allowing for a modular design where modules work collaboratively to ensure stability and efficiency during high-intensity operations. When one drill bit 40 fails (e.g., due to a broken shank, chipping, or severe wear), it can be quickly and individually replaced, reducing operating costs. Compared to traditional single large drilling tools, the multiple impactors 32 of the down-the-hole hammer 100 in this embodiment can simultaneously generate multiple impact forces on the rock, resulting in a more significant breaking effect and accelerating drilling speed. Furthermore, the down-the-hole hammer 100 can adapt to various complex geological conditions, including hard rock layers, gravel layers, and other hard soil and rock formations, making it widely applicable and highly adaptable. Compared to large drilling tools, the down-the-hole hammer 100 has higher drilling efficiency, completing more drilling work in the same amount of time and significantly shortening the construction cycle.

[0042] The down-the-hole hammer 100 provided in the embodiments of this application includes: a connector 10, an air storage component 20, an impact seat 30, and a drill bit 40; the connector 10 is used to connect the drill rod, and the connector 10 is provided with an airflow channel 11; the air storage component 20 is connected to the connector 10, and the air storage component 20 is provided with an air inlet 21 and a plurality of air outlets 22 communicating with the air inlet 21, and the air inlet 21 is connected with the airflow channel 11; the impact seat 30 is connected to the air storage component 20, and 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 22; each impactor 32 is disposed in an impact chamber 31; wherein, the impactor 32 includes a piston 321, which can reciprocate under air pressure; there are a plurality of drill bits 40, and each drill bit 40 is disposed at the end of an impactor 32 away from the air storage component 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 can effectively improve construction efficiency and reduce construction costs.

[0043] Optionally, in one embodiment of this application, such as Figure 1 , Figure 2 As shown, the impactor 32 also includes a piston chamber, in which a piston 321 passes. The piston chamber is connected to the air outlet 22, allowing the piston 321 to reciprocate under air pressure. Because the impactor 32 is equipped with a piston chamber, when one impactor 32 malfunctions or is damaged, that impactor 32 can be removed and replaced individually without affecting other normally functioning impactors 32. This improves the modularity of the impactor 32 and helps increase the working efficiency of the down-the-hole hammer. In this embodiment, as... Figure 2 As shown, the impactor 32 can be further configured with a cylinder structure to form a piston chamber. In addition, in some other embodiments, the impact chamber 31 can also form a piston chamber alone or participate in the formation of a piston chamber.

[0044] Optionally, in one embodiment of this application, such as Figures 3-5 As shown, the first end of the gas storage component 20 is connected to the connector 10, and the first end of the gas storage component 20 is provided with an air inlet 21; the second end of the gas storage component 20 is connected to the first end of the impact seat 30, and the second end of the gas storage component 20 is provided with multiple air outlets 22, and each air outlet 22 is provided with an air distribution channel 23 to communicate with each other; and / or, the air outlet 22 is a stepped hole, the air outlet 22 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 air distribution channel 23 connects the first diameter hole and the air inlet 21; the first end of the impactor 32 is also provided with a check valve 322, which can elastically abut against the opening of the first diameter hole.

[0045] In this embodiment, the diameter of the air inlet 21 can be larger than that of the air outlet 22, so that the air inlet 21 has a larger volume, and the air inlet 21 has an internal thread, which can be connected to the external thread of the second end of the connector 10. After the air storage component 20 is connected to the connector 10, the compressed air provided by the air compressor can enter the air inlet 21 through the airflow channel 11 passing through both ends of the connector 10. Since each air outlet 22 is connected to the air inlet 21 by a distribution channel 23, the compressed air in the air inlet 21 enters the air outlet 22 through the distribution channel 23, so that the compressed air in the air inlet 21 is evenly distributed and delivered to each air outlet 22. The multiple air outlets 22 can be evenly distributed around the axial direction of the air storage component 20, and the corresponding distribution channels 23 can also be evenly distributed around the axial direction of the air storage component 20. The air outlet 22 is a stepped hole, including a first diameter hole with a smaller diameter and a second diameter hole with a larger diameter. The first end of the impactor 32 is also provided with a check valve 322. The opening of the first diameter hole can be designed as a cone, so that it can fit tightly with the check valve 322. The check valve 322 elastically abuts against the opening of the first diameter hole and can open and close according to the air pressure, thereby preventing the waste and mud at the bottom of the hole from flowing back into the impactor 32 when the down-the-hole hammer 100 stops working during the drilling process, causing the impactor 32 to jam and fail.

[0046] In this embodiment, the second end of the gas storage component 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 component 20, and it can be bolted to the corresponding position of the first end of the impact seat 30. To ensure that the second end of the gas storage component 20 and the first end of the impact seat 30 can be accurately positioned and connected, a protrusion can be provided on the end face of the second end of the gas storage component 20, and a concave body can be provided at the corresponding position of 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 component 20, and a protrusion can be provided at the corresponding position of the first end of the impact seat 30. The protrusion and concave body can be fitted together to facilitate installation and positioning, and to facilitate the assembly and disassembly of the gas storage component 20 and the impact seat 30. For example... Figure 4 As shown, in this embodiment, a plurality of gas storage protrusions 25 are provided axially at the second end of the gas storage component 20, such as... Figure 6 , Figure 7 As shown, a plurality of impact seat recesses 35 are provided axially at the first end of the impact seat 30. In addition, a sealing groove can be opened and a sealing element can be provided at the orifice position of the second diameter hole on the second end face of the air storage component 20. This can ensure the sealing performance of the air outlet 22 and prevent compressed air from leaking between the second end of the air storage component 20 and the first end of the impact seat 30.

[0047] Optionally, in one embodiment of this application, such as Figure 2As shown, the impactor 32 also includes an outer cylinder 323, an inner cylinder 324, a valve seat 325, and a bushing 326. The outer cylinder 323 passes through the impact chamber 31, the inner cylinder 324 passes through the first end of the outer cylinder 323, the bushing 326 passes through the second end of the outer cylinder 323, and the valve seat 325 passes through the inner cylinder 324. The outer cylinder 323, the inner cylinder 324, the valve seat 325, and the bushing 326 form a piston chamber. The outer cylinder 323, the inner cylinder 324, and the bushing 326 can each be a tubular structure with two through ends. In this way, based on the structural layout and characteristics of the components such as the outer cylinder 323, the inner cylinder 324, the valve seat 325, and the bushing 326, and combined with the movement position of the piston 321, a corresponding fluid channel can be constructed to generate a thrust in the corresponding direction on the piston 321, so that the piston 321 can reciprocate and impact the drill bit 40.

[0048] In this embodiment, the impactor 32 has a first stroke air chamber 327 and a second stroke air chamber 329 for applying air pressure to the piston 321 in the direction of the drill bit 40, and a return air chamber 328 for applying air pressure to the piston 321 in the direction away from the drill bit 40. The impactor 32 also has 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 22. The displacement air guide channel is connected to the first air guide channel and the first stroke air chamber 327, and the displacement air guide channel can be connected to the second stroke air chamber 329. The second air guide channel can be connected to the displacement air guide channel and the return air chamber 328.

[0049] There are several ways in which the impactor 32 can form the above structure. For example, the air distribution seat 325 may include a first disc 3253, a second disc 3254 and a rod 3255. The first disc 3253 and the second disc 3254 are axially inserted into the inner cylinder 324. An inter-disc chamber 3256 is formed between the first disc 3253, the second disc 3254 and the inner cylinder 324. An air distribution through hole 3257 is provided on the first disc 3253 to connect the air outlet 22 and the inter-disc chamber 3256.

[0050] The inner diameter of the inner cylinder 324 is smaller than the inner diameter of the outer cylinder 323, so the piston 321 can be configured as 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 slide with the inner cylinder 324, the second shaft diameter section 3215 of the piston 321 can slide with the outer cylinder 323, and the third shaft diameter section 3216 of the piston 321 can slide 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.

[0051] The outer cylinder 323 has a first annular groove 3231 on its inner wall near the valve seat 325; the inner cylinder 324 has a first wall hole 3241 between the inter-disc chamber 3256 and the first annular groove 3231, which connects the inter-disc chamber 3256 and the first annular groove 3231; the inner cylinder 324 has 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 valve through hole 3257, the inter-disc chamber 3256, the first wall hole 3241, the first annular groove 3231, and the second wall hole 3242 can form a first air guide channel.

[0052] The displacement air guide channel can be a wall groove 3217 axially formed on the outer wall of the piston 321 from the first shaft diameter section 3214 toward 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 displacement air guide channel is connected to the first stroke air chamber 327 and is also connected to the second wall hole 3242. In this way, the displacement air guide channel can be connected to the first air guide channel, allowing compressed air to enter the first stroke air chamber 327 and generate a pneumatic force on the piston 321 toward the drill bit 40.

[0053] The second air guide channel can be a second annular groove 3232 opened on the inner wall of the outer cylinder 323 at a position corresponding to the second axial section 3215 of the piston 321. Since the piston 321 reciprocates, when the piston 321 moves to the corresponding position, the wall groove 3217 on the outer wall of the piston 321 can connect with the second annular groove 3232, that is, the displacement air guide channel connects with the second air guide channel, and the displacement air guide channel connects with the first stroke air chamber 327. Thus, the second air guide channel can connect with the first stroke air chamber 327. Furthermore, the third axial section 3216 of the piston 321 can extend into the inner cavity of the bushing 326, so that a return air chamber 328 can be formed between the piston 321, the outer cylinder 323, and the bushing 326, and the second air guide channel can connect with the return air chamber 328, allowing compressed air to enter the return air chamber 328 and exert a pressure force on the piston 321 away from the drill bit 40.

[0054] The second-stroke air chamber 329 can be formed between the piston 321 and the valve seat 325. For example, the piston 321 has a through hole along the axial direction, and the rod 3255 of the valve seat 325 can extend into the through hole. The first axial section 3214 of the piston 321 slides with the inner cylinder 324, and the second disc 3254 of the valve seat 325 passes through the inner cylinder 324. In this way, when the piston 321 moves to the corresponding position, the rod 3255 extends into the through hole, and the second-stroke air chamber 329 can be formed between the valve seat 325 and the piston 321. In addition, the inner wall of the inner cylinder 324 along the axial direction... An inner groove 3243 is provided, which is connected to the second stroke air chamber 329. When the piston 321 moves to the corresponding position, the wall groove 3217 of the piston 321 can be connected to the inner groove 3243 of the inner cylinder 324. That is, the displacement air guide channel is connected to the second stroke air chamber 329, while the wall groove 3217 of the piston 321 is disconnected from the second annular groove 3232. Since the displacement air guide channel is connected to the first air guide channel, compressed air can enter the second stroke air chamber 329 to generate a pneumatic force on the piston 321 towards the drill bit 40.

[0055] Optionally, in one embodiment of this application, such as Figure 1 , Figure 2 As shown, piston 321 has a first-stroke thrust surface 3211 formed in the first-stroke air chamber 327 for applying air pressure force to piston 321 in the direction of drill bit 40; piston 321 has a return thrust surface 3212 formed in the return air chamber 328 for applying air pressure force to piston 321 in the direction away from drill bit 40; piston 321 has a second-stroke thrust surface 3213 formed in the second-stroke air chamber 329 for applying air pressure force to piston 321 in the direction of drill bit 40; wherein, the area of ​​the first-stroke thrust surface 3211 is smaller than the area of ​​the return thrust surface 3212.

[0056] In this embodiment, the piston 321 is configured in a stepped shaft shape. The outer diameter of the first shaft section 3214 is smaller than the outer diameter of the second shaft section 3215. Therefore, within the first stroke air chamber 327, the second shaft section 3215, near the shoulder of the first shaft section 3214, forms a first stroke thrust surface 3211 for applying a pneumatic force to the piston 321 in the direction of the drill bit 40. The outer diameter of the third shaft section 3216 is smaller than the outer diameter of the second shaft section 3215. Therefore, within the return air chamber 328, the second shaft section 3215, near the shoulder of the third shaft section 3216, forms a return thrust surface 3212 for applying a pneumatic force to the piston 321 in the direction away from the drill bit 40. The first stroke thrust surface 3211 and the return stroke thrust surface 3212 can each be 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 piston 321 moves to the point where the rod 3255 of the valve seat 325 extends into the through hole of the piston 321, the first shaft diameter section 3214 of the piston 321 slides into the inner cylinder 324, and the second disc 3254 of the valve seat 325 passes through the inner cylinder 324. In the formed second stroke air chamber 329, the first end face of the piston 321 can form a second stroke thrust surface 3213 for applying air pressure force to the piston 321 in the direction of the drill bit 40.

[0057] Based on the above-mentioned flow channel design of the impactor 32, its working process is as follows:

[0058] When the impactor 32 is in a vertical or upright position, 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, forming a return air chamber 328 between the piston 321, the outer cylinder 323, and the bushing 326. Compressed air enters the air inlet 21 of the air storage component 20 through the airflow channel 11 of the connector 10, and flows to the multiple air outlets 22 through the multiple air distribution channels 23 of the air storage component 20. Under the action of air pressure, the check valve 322, which elastically abuts at the first diameter hole of the air outlet 22, is pushed open. Then, compressed air flows through the first air guide channel, that is, from the air distribution hole 3257 of the first disc 3253 of the valve seat 325, into the inter-disc chamber 3256 formed between the first disc 3253, the second disc 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 connected to the second wall hole 3242, and at this time... In the current position of piston 321, the wall groove 3217 of piston 321 is connected to the second annular groove 3232 of outer cylinder 323, that is, the displacement air guide passage is connected to the second air guide passage, and the second air guide passage is connected to the return air chamber 328, so compressed air enters the return air chamber 328. In the same position of piston 321, the wall groove 3217 of piston 321 is not connected to the inner groove 3243 of inner cylinder 324, and the rod 3255 of valve seat 325 does not extend into the through hole of piston 321. Since the area of ​​the first stroke thrust surface 3211 of piston 321 in first stroke air chamber 327 is smaller than the area of ​​the return thrust surface 3212 of piston 321 in return air chamber 328, the air pressure force on the return thrust surface 3212 is greater than the air pressure force on the first stroke thrust surface 3211, and piston 321 moves away from drill bit 40.

[0059] When the second end of piston 321 disengages from bushing 326, compressed air in return chamber 328 blows slag from the bottom of the hole through the through holes at both ends of bushing 326 and drill bit 40. Simultaneously, due to the reverse force, piston 321 decelerates. The first-stroke thrust surface 3211 in first-stroke chamber 327 decelerates piston 321 under air pressure. When piston 321 moves to the point where rod 3255 of valve seat 325 extends into the through hole of piston 321, a second-stroke chamber 329 is formed between piston 321 and valve seat 325 because the first shaft diameter section 3214 of piston 321 slides into inner cylinder 324, and the second disc 3254 of valve seat 325 passes through inner cylinder 324. In this position of piston 321, the wall groove 3217 of piston 321 is connected to the inner groove 3243 of inner cylinder 324, that is, the displacement guide passage is connected to the second stroke air chamber 329, and the wall groove 3217 of piston 321 is connected to the second wall hole 3242, that is, the displacement guide passage is connected to the first guide passage, so that the second stroke air chamber 329 is connected to the first guide passage, and compressed air enters the second stroke air chamber 329 through the first guide passage; at the same time, since the displacement guide passage is connected to the first stroke air chamber 327, compressed air enters the first stroke air chamber 327 through the first guide passage. At this time, the second stroke thrust surface 3213 formed on the first end face of piston 321 in the second stroke air chamber 329, and the first stroke thrust surface 3211 formed on the first stroke air chamber 327, are jointly subjected to air pressure in the direction of drill bit 40, so that the stroke force on piston 321 reaches the maximum. The force-bearing area is the sum of the areas of the second stroke thrust surface 3213 and the first stroke thrust surface 3211, so that piston 321 stops returning and accelerates to impact the tail of drill bit 40. Piston 321 moves back and forth in this way, impacting drill bit 40, thereby achieving the rock-breaking effect.

[0060] It should be noted that the flow channel design structure of the impactor 32 can be varied so that the piston 321 can reciprocate under air pressure. This application specifically provides one of the above embodiments. Those skilled in the art can design and modify the specific structure and its usage within the scope of this application according to the on-site construction conditions.

[0061] Because the impactor 32 mainly relies on compressed air to create different air pressure differences inside the impactor 32 during operation, driving the piston 321 to reciprocate and impact the tail of the drill bit 40, transmitting impact energy to crush and crush rocks. After the impactor 32 has been working for a long time, the air distribution seat 325, inner cylinder 324, outer cylinder 323, piston 321, and bushing 326 will all experience a certain degree of wear, resulting in excessive movement clearance, 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 piston 321 is ≤0.25mm, the clearance between the inner cylinder 324 and piston 321 is ≤0.25mm, the clearance between piston 321 and outer cylinder 323 is ≤0.25mm, and the clearance between piston 321 and bushing 326 is ≤0.38mm.

[0062] Optionally, in one embodiment of this application, such as Figure 2 As shown, the gas distribution seat 325 has a groove 3251 on the side near the gas storage component 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 element 3252 is provided within the groove 3251. Both ends of the elastic element 3252 abut against the gas distribution seat 325 and the check valve 322 respectively, so that the other end of the check valve 322 can elastically abut against the air outlet 22. The elastic element 3252 can be a cylindrical spring, etc., so that the check valve 322 can elastically abut against the air outlet 22. When the down-the-hole hammer 100 is working, the pressure of the compressed air is greater than the elastic force of the elastic element 3252, which can push open the check valve 322 and flow out from the orifice of the air outlet 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 22 to prevent foreign objects from flowing back.

[0063] Optionally, in one embodiment of this application, such as Figure 1 As shown, it also includes a guide 50, which is connected to the second end of the impact seat 30. The guide 50 has multiple guide holes 51, each corresponding to an impact chamber 31; the drill bit 40 passes through the guide hole 51. The guide 50 is connected to the second end of the impact seat 30. Alternatively, a flange or flange structure can be provided at the second end of the impact seat 30 and bolted to the guide 50 at the corresponding position. Figures 8-10As shown, multiple guide holes 51 are evenly distributed around the axial direction of the guide 50. To ensure precise positioning and connection between the guide 50 and the second end of the impact seat 30, a protrusion can be provided on the end face of the guide 50 near the impact seat 30, and a corresponding recess can be provided on the second end of the impact seat 30; or a recess can be provided on the end face of the guide 50 near the impact seat 30, and a protrusion can be provided on the second end of the impact seat 30. The protrusion and recess can be fitted together to facilitate installation and positioning, and to facilitate the assembly and disassembly of the guide 50 and the impact seat 30. For example, in this embodiment, multiple impact seat protrusions 36 are provided around the axial direction on the second end of the impact seat 30, and multiple guide recesses 57 are provided around the axial direction on the end of the guide 50 near the impact seat 30. In addition, a sealing element can be further provided between the end faces of the guide 50 and the second end of the impact seat 30 at the position corresponding to the opening of the impact cavity 31 to improve the airtightness between the guide 50 and the second end of the impact seat 30.

[0064] Optionally, in one embodiment of this application, such as Figure 11 As shown, the outer wall of the drill bit 40 is formed with a first polyhedron, and a fitting 52 is provided inside the guide hole 51. The fitting 52 has an inner wall adapted to the first polyhedron, and the outer wall of the fitting 52 is formed with a second polyhedron. The guide hole 51 also has an inner wall adapted to the second polyhedron. For example, the first polyhedron of the outer wall of the drill bit 40 can be a hexahedron, and the fitting 52 can specifically be a matching hexagonal sleeve. The second polyhedron of the inner wall of the guide hole 51 is also a hexahedron. In this way, the fitting 52 facilitates the provision of rotational torque for the rotation of the drill bit 40, preventing the drill bit 40 from slipping. In addition, the frictional contact between the fitting 52 and the drill bit 40 helps to extend the service life of the guide 50.

[0065] Optionally, in one embodiment of this application, such as Figure 8 , Figure 9 As shown, the guide 50 has multiple protrusions 53 circumferentially arranged at the end opposite to the impact seat 30. A radial slag discharge groove 54 is formed on the top end face of the protrusion 53 along the radial direction of the guide 50. The protrusions 53 can guide the installation of the drill bit 40, preventing incorrect installation. Furthermore, the protrusions 53 can be provided with arc-shaped radial slag discharge grooves 54 to facilitate the discharge of slag and waste soil after the drill bit 40 has been broken.

[0066] Optionally, in one embodiment of this application, such as Figure 12 , Figure 13As shown, the drill bit 40 has a through hole extending through both ends. A radial slag discharge groove 401 is formed on the head end face of the drill bit 40 along its radial direction. The head of the drill bit 40 forms an arc-shaped structure 402. The arc-shaped structures 402 of the multiple drill bits 40 configured in the down-the-hole hammer 100 are arranged concentrically. The head of the drill bit 40 can be designed to be irregularly shaped, forming an arc-shaped structure 402. After multiple drill bits 40 are installed in the down-the-hole hammer 100, the arc-shaped structures 402 of each drill bit 40 are arranged concentrically, which can be combined into a near-circular or near-spherical shape, effectively breaking up rocks. Furthermore, the through hole extending through both ends of the drill bit 40 facilitates the guidance of compressed air to blow slag from the bottom of the hole. The radial slag discharge groove 401 on the head of the drill bit 40 further helps to guide compressed air to clean the bottom of the hole, maintaining direct contact between the surface of the drill bit 40 and the un-drilled rock layer, thereby increasing the drilling speed.

[0067] To further facilitate the discharge of slag and waste soil from the bottom of the borehole, prevent repeated crushing, and improve work efficiency, optionally, in one embodiment of this application, the outer wall of the gas storage component 20 is provided with an axial slag discharge groove 24 along the axial direction of the gas storage component 20; and / or the outer wall of the impact seat 30 is provided with an axial slag discharge groove 33 along the axial direction of the impact seat 30; and / or the outer wall of the guide 50 is provided with an axial slag discharge groove 55 along the axial direction of the guide 50. The outer walls of the gas storage component 20, the impact seat 30, and the guide 50 can each be provided with multiple arc-shaped axial slag discharge grooves along their axial directions. For example, the outer wall of the gas storage component 20 is provided with six circumferentially distributed axial slag discharge grooves 24, the outer wall of the impact seat 30 is provided with six circumferentially distributed axial slag discharge grooves 33, and the outer wall of the guide 50 is provided with six circumferentially distributed axial slag discharge grooves 55. When assembling the down-the-hole hammer 100, the axial slag discharge groove 24 of the gas storage component, the axial slag discharge groove 33 of the impact seat, and the axial slag discharge groove 55 of the guide are aligned one by one along the axial direction, thereby forming a rock slag discharge channel on the outer wall of the down-the-hole hammer 100, which is conducive to the discharge of slag and waste soil at the bottom of the hole, prevents repeated crushing, and improves work efficiency.

[0068] To improve sealing performance, a sealing groove and a sealing element can be provided at the orifice of the impact cavity 31 on the first end face of the impact seat 30, and / or a sealing groove and a sealing element can be provided on the end face of the air distribution seat 325 near the air outlet 22. This can further prevent compressed air from leaking between the second end of the air storage component 20 and the first end of the impact seat 30. In addition, a retaining 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 cavity 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; and a retaining 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.

[0069] The down-the-hole hammer 100 in this embodiment successfully integrates the technical advantages of small rock drilling tools, reducing the cost of large-diameter drilling equipment while improving construction efficiency and adaptability. The modular design of the down-the-hole hammer 100 not only enhances maintenance convenience but also strengthens the equipment's adaptability, enabling it to meet diverse engineering needs.

[0070] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. 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. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. "Multiple" refers to at least two.

[0071] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0072] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0073] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in another embodiment" appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0074] The embodiments of this application have been described in detail above. Those skilled in the art can design and modify the device and its usage within the scope of this application according to the on-site construction conditions.

[0075] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A percussive hammer, characterized in that The utility model relates to a drilling tool, comprising: a joint for connecting drill pipes, the joint being provided with an airflow channel; a gas storage member connected to the joint, the gas storage member being provided with an air inlet hole and a plurality of air outlet holes in communication with the air inlet hole, the air inlet hole being in communication with the airflow channel; a percussion seat connected to the gas storage member, the percussion seat being provided with a plurality of percussion cavities and a plurality of impactors, each of the percussion cavities corresponding to one of the air outlet holes, each of the impactors being arranged in one of the percussion cavities, wherein the impactor comprises a piston capable of reciprocating under the action of air pressure; a plurality of drill bits, each of the drill bits being arranged at one end of the impactor away from the gas storage member, so that the piston of the impactor can impact the drill bit during reciprocation.

2. A hammer according to claim 1, characterized in that The impactor further comprises a piston cavity, the piston being arranged in the piston cavity, the piston cavity being capable of being in communication with the air outlet hole, so that the piston can reciprocate under the action of air pressure.

3. A hammer according to claim 1, wherein 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 air inlet hole; the second end of the gas storage member is connected to the first end of the percussion seat, and the second end of the gas storage member is provided with the plurality of air outlet holes, each of the air outlet holes being provided with a gas distribution channel in communication with the air inlet hole; and / or The air outlet hole is a stepped hole, the air outlet hole comprising a first diameter hole and a second diameter hole, the inner diameter of the first diameter hole being smaller than the inner diameter of the second diameter hole, the gas distribution channel being in communication with the first diameter hole and the air inlet hole; the first end of the impactor is further provided with a check valve capable of elastically abutting against the orifice of the first diameter hole.

4. A hammer according to claim 2, wherein The impactor further comprises an outer cylinder, an inner cylinder, a gas distribution seat and a bushing, the outer cylinder being arranged in the percussion cavity, the inner cylinder being arranged at the first end of the outer cylinder, the bushing being arranged at the second end of the outer cylinder, the gas distribution seat being arranged in the inner cylinder, the outer cylinder, the inner cylinder, the gas distribution seat and the bushing forming the piston cavity; The impactor is formed with a first stroke gas chamber and a second stroke gas chamber for applying air pressure to the piston in the direction of the drill bit, and a return gas chamber for applying air pressure to the piston in the direction away from the drill bit; the impactor is further formed with a first gas guide channel, a displacement gas guide channel and a second gas guide channel; The first gas guide channel is capable of being in communication with the air outlet hole; The displacement gas guide channel is in communication with the first gas guide channel, the displacement gas guide channel being in communication with the first stroke gas chamber, and the displacement gas guide channel being capable of being in communication with the second stroke gas chamber; The second gas guide channel is capable of being in communication with the displacement gas guide channel, and the second gas guide channel is capable of being in communication with the return gas chamber.

5. A hammer according to claim 4, wherein The piston is formed with a first stroke thrust surface in the first stroke gas chamber for applying air pressure to the piston in the direction of the drill bit; The piston is formed with a return thrust surface in the return gas chamber for applying air pressure to the piston in the direction away from the drill bit; The piston is formed with a second-stroke thrust surface in the second-stroke gas chamber for applying a gas pressure force to the piston in the direction of the drill bit; The area of the first-stroke thrust surface is smaller than the area of the return-stroke thrust surface.

6. A hammer according to claim 5, wherein The gas distribution seat is provided with a groove on the side close to the gas storage member, the first end of the impactor is further provided with a check valve, one end of the check valve penetrates into the groove, the groove is provided with an elastic member, and 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 gas outlet hole.

7. A hammer according to claim 6, wherein Further comprising 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 the guide holes corresponds to one of the impact cavities; the drill bit penetrates into the guide hole.

8. A hammer according to claim 7, characterised in that The outer wall of the drill bit is formed with a first polyhedron, the guide hole is provided with a sleeve, the sleeve has an inner wall matched with the first polyhedron, the outer wall of the sleeve is formed with a second polyhedron, and the guide hole has an inner wall matched with the second polyhedron.

9. A hammer according to claim 7, characterised in that The outer wall of the gas storage member is provided with a gas storage member axial slag discharge groove along the axial direction of the gas storage member; and / or The 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 a guide axial slag discharge groove along the axial direction of the guide; and / or The guide is provided with a plurality of bosses on the end away from the impact seat along the circumferential direction, and the top end face of the boss is provided with a guide radial slag discharge groove along the radial direction of the guide.

10. A hammer according to claim 1, wherein The drill bit has a through hole penetrating through both ends, the head end face of the drill bit is provided with a drill bit radial slag discharge groove along the radial direction of the drill bit, the head of the drill bit is formed with an arc structure, and the arc structures of the plurality of drill bits configured by the hammer are arranged with the same center.

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