Reverse circulation cluster type down-the-hole hammer for reaming

Abstract

The utility model relates to the technical field of chambering cluster type down-the-hole hammers, in particular to a chambering reverse circulation cluster type down-the-hole hammer which is divided into an upper layer and a lower layer, and the down-the-hole hammer on the middle layer is telescopically connected to the middle of the down-the-hole hammer on the circumferential layer. A plurality of circumferential-layer hammer heads are arranged on the bottom surface of the circumferential-layer down-the-hole hammer at intervals, and one or more middle-layer hammer heads are arranged on the bottom surface of the middle-layer down-the-hole hammer; a supporting plate assembly matched with the space in shape is further arranged in the space between every two adjacent circumferential layer hammer heads and the inner edge and the outer edge of the circumferential layer down-the-hole hammer, and the supporting plate assemblies are installed on the bottom face of the circumferential layer down-the-hole hammer. The supporting plate assembly comprises a supporting plate main body, one side of the supporting plate main body is further provided with a vertically-through opening, and a flow guide pipe is further arranged on the side, away from the circumferential layer hammer head, in the opening; the supporting plate assembly further comprises a flow guide plate which is arranged on the side, close to the circumferential layer hammer head, in the opening, and the two ends of the flow guide plate abut against the opposite faces in the opening. According to the design, reaming of the down-the-hole hammer can be easier, the hammer head on the circumferential layer is protected, and waste residues are guided.

Description

Technical Field

[0001] The utility model relates to the technical field of hole-expanding cluster-type down-the-hole hammers, in particular to a hole-expanding reverse circulation cluster-type down-the-hole hammer. Background Art

[0002] In some emergency rescue or large-diameter pile hole construction fields, the working conditions of small holes being enlarged may be encountered. When performing such operations, a drilling tool with a DTH hammer only on the circumference but no DTH hammer in the middle is usually used. When the center hole is blocked, the high-pressure pneumatic DTH hammer cannot drill well.

[0003] Layered down-the-hole hammers have begun to appear in the prior art, but slag removal and diversion technology is still imperfect. For example, the invention patent CN202410454043.0 published on June 11, 2024, proposes a large-diameter down-the-hole hammer reaming drill bit, including a drill bit body and a pilot section, wherein the pilot section is assembled at a central position at the bottom of the drill bit body, and the drill bit body and the pilot section can rotate synchronously. The upper part of the drill bit body is provided with a splined side wall circumference with a plurality of internal spray holes, and the plurality of internal spray holes are connected to the central channel of the drill bit body. The plurality of internal spray holes are evenly distributed around the central channel of the drill bit body. A slag suction channel is provided in the middle and lower part of the drill bit body, and the inlet of the slag suction channel is provided at the bottom of the drill bit body. The outlet of the slag suction channel is connected to the central channel of the drill bit body, thereby improving the hole quality of large-diameter drilling. However, the slag discharge channel design of this layered down-the-hole hammer is very complex, has a high probability of failure, and is easily interfered with by ore debris during construction. Utility Model Content

[0004] The utility model provides a hole-expanding reverse circulation cluster down-the-hole hammer to solve the technical problems existing in the above-mentioned background technology.

[0005] In order to achieve the above object, the utility model proposes a hole-expanding reverse circulation cluster down-the-hole hammer, which is divided into two layers, the middle layer down-the-hole hammer is telescopically connected to the middle part of the peripheral layer down-the-hole hammer;

[0006] A plurality of peripheral layer hammer heads are arranged at intervals on the bottom surface of the peripheral layer down-the-hole hammer, and one or more intermediate layer hammer heads are arranged on the bottom surface of the intermediate layer down-the-hole hammer;

[0007] A support plate assembly having a shape that matches the space is provided in the space between the two adjacent peripheral layer hammer heads and the inner and outer edges of the peripheral layer down-the-hole hammer, and the support plate assembly is installed on the bottom surface of the peripheral layer down-the-hole hammer;

[0008] The support plate assembly includes a support plate body, one side of which is provided with an opening extending vertically therethrough, and a guide pipe is provided inside the opening on a side away from the hammer head of the peripheral layer;

[0009] The support plate assembly also includes a guide plate, which is arranged on the side of the opening close to the hammer head of the peripheral layer. The two ends of the guide plate are abutted against the opposite surfaces inside the opening. It is located above the bottom surface of the support plate body, and the height of the guide plate close to the hammer head of the peripheral layer is not less than the height of the end away from the hammer head of the peripheral layer.

[0010] The down-the-hole hammer of the utility model is designed with two layers, the middle layer down-the-hole hammer is at the bottom, and the peripheral layer down-the-hole hammer is at the top. The height interval between the middle layer down-the-hole hammer and the peripheral layer down-the-hole hammer is between 10-40 cm, and the middle layer down-the-hole hammer can be extended and retracted relative to the peripheral layer down-the-hole hammer.

[0011] The number of the intermediate layer hammer head can be one or more, and the number of the peripheral layer hammer heads can be more than two. A set of support plate components is provided between two adjacent peripheral layer hammer heads.

[0012] The support plate assembly is welded to the bottom surface of the peripheral down-the-hole hammer to ensure a stable structure that is not easy to loosen.

[0013] The edges of the support plate are chamfered to reduce direct impact on the rocks and increase the durability of the structure.

[0014] The main body of the supporting plate is flush with the hammer head of the surrounding layer.

[0015] Furthermore, the support plate body needs to be made of a material with high strength and hardness. When the middle layer down-the-hole hammer is fully retracted into the peripheral layer down-the-hole hammer, the support plate body can share the force for the peripheral layer hammer head and protect the peripheral layer hammer head.

[0016] The support plate body and the guide plate are processed separately or integrally, which improves production flexibility and cost control.

[0017] The opening is arc-shaped and faces the hammer head of the surrounding layer, which is used to guide the crushed stone and flushing liquid to flow into the slag discharge pipe.

[0018] The opening width should not be less than the diameter of the diversion pipe to ensure that gravel and flushing fluid can pass smoothly without obstruction.

[0019] The height of the guide plate at one end close to the hammer head of the surrounding layer is greater than the height of the guide plate at one end away from the hammer head of the surrounding layer, which is conducive to the smooth discharge of crushed stones.

[0020] There are multiple slag discharge pipes designed on the peripheral layer down-the-hole hammer. The slag discharge pipes are connected above the guide pipe for slag discharge. The slag discharge pipes can discharge the waste slag crushed by the down-the-hole hammer operation in each peripheral layer.

[0021] The slag discharge system of the reverse circulation cluster down-the-hole hammer effectively improves the slag discharge efficiency and reduces the risk of borehole blockage.

[0022] The reverse circulation cluster down-the-hole hammer is equipped with a double-layer drill pipe for slag removal and gas supply, supporting the entry of high-pressure gas and the discharge of waste gas and waste slag.

[0023] The features and advantages of the utility model of a hole enlarging reverse circulation cluster down-the-hole hammer are:

[0024] 1. The layered design of the down-the-hole hammer of the utility model can drill well when encountering the working conditions of small holes and enlarging holes.

[0025] 2. The support plate assembly of the utility model can guide the crushed stones and the flushing liquid to flow to the slag discharge pipe, share the force for the surrounding hammer head, protect the surrounding hammer head, and has a simple structure and is easy to obtain materials.

[0026] 3. The guide pipe of the utility model can form a slag discharge system of a reverse circulation cluster down-the-hole hammer with the slag discharge pipe, which effectively improves the slag discharge efficiency and reduces the risk of borehole blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached figure:

[0028] Figure 1 This is a schematic diagram of the overall structure of a hole-enlarging reverse circulation cluster down-the-hole hammer of the utility model;

[0029] Figure 2 This is a bottom view of a hole-enlarging reverse circulation cluster down-the-hole hammer of the utility model;

[0030] Figure 3 This is a partial cross-sectional view of a hole-expanding reverse circulation cluster down-the-hole hammer of the utility model.

[0031] The components represented by the reference numerals in the figure are:

[0032] 1. Peripheral layer down-the-hole hammer; 2. Intermediate layer down-the-hole hammer; 3. Peripheral layer hammer head; 4. Intermediate layer hammer head; 5. Support plate assembly; 501. Support plate body; 502. Guide plate; 511. First arc portion; 512. Second arc portion; 513. Opening; 6. Guide pipe. DETAILED DESCRIPTION

[0033] Example 1

[0034] refer to Figure 1 , a hole-expanding reverse circulation cluster down-the-hole hammer, the down-the-hole hammer is divided into two layers, the middle layer down-the-hole hammer 2 is telescopically connected to the middle part of the peripheral layer down-the-hole hammer 1.

[0035] A plurality of peripheral layer hammer heads 3 are arranged at intervals on the bottom surface of the peripheral layer down-the-hole hammer 1, and an intermediate layer hammer head 4 is arranged on the bottom surface of the intermediate layer down-the-hole hammer 2. Here, as needed, the intermediate layer hammer head 4 can also be arranged in plurality.

[0036] A support plate assembly 5 whose shape matches the space is further provided in the space between two adjacent peripheral layer hammer heads 3 and the inner and outer edges of the peripheral layer down-the-hole hammer 1 . The support plate assembly 5 is installed on the bottom surface of the peripheral layer down-the-hole hammer 1 .

[0037] The support plate assembly 5 includes a support plate body 501 . An opening 513 extending vertically therethrough is provided on one side of the support plate body 501 . A flow guide tube 6 is provided inside the opening 513 on a side away from the peripheral hammer head 3 .

[0038] The support plate assembly 5 also includes a guide plate 502, which is arranged inside the opening 513 near the side of the peripheral layer hammer head 3. The two ends of the guide plate 502 are in contact with the opposite surfaces inside the opening 513, and are located above the bottom surface of the support plate body 501. The height of the guide plate 502 close to the peripheral layer hammer head 3 is not less than the height of the end away from the peripheral layer hammer head 3.

[0039] The down-the-hole hammer of the present invention is designed in two layers, with the middle layer down-the-hole hammer 2 at the bottom and the peripheral layer down-the-hole hammer 1 at the top. The height interval between the middle layer down-the-hole hammer 2 and the peripheral layer down-the-hole hammer 1 is between 10-40 cm, and the middle layer down-the-hole hammer 2 can be extended and retracted relative to the peripheral layer down-the-hole hammer 1.

[0040] In this embodiment, there is one intermediate layer hammer head 4 and three peripheral layer hammer heads 3. A group of support plate assemblies 5 are arranged between two adjacent peripheral layer hammer heads 3. The openings 513 of the support plate body 501 are in the same direction, ensuring that diversion and guidance are provided for each peripheral layer hammer head 3.

[0041] The support plate assembly 5 can be welded to the bottom surface of the peripheral layer of the down-the-hole hammer 1 to ensure that the structure is stable and not easy to loosen.

[0042] The edges of the support plate body 501 are chamfered to reduce direct impact on the rock and increase the durability of the structure.

[0043] See also Figure 3 In this embodiment, the supporting plate body 501 is preferably designed to be flush with the surrounding hammer head 3.

[0044] Furthermore, the support plate body 501 needs to be made of a material with high strength and hardness. When the intermediate layer down-the-hole hammer 2 is fully retracted into the peripheral layer down-the-hole hammer 1, the support plate body 501 can share the force for the peripheral layer hammer head 3 and protect the peripheral layer hammer head 3.

[0045] Reasonable structural design and material selection extend the service life of the down-the-hole hammer.

[0046] The support plate body 501 and the guide plate 502 are formed separately or integrally, which improves production flexibility.

[0047] The opening 513 is arc-shaped, such as Figure 2 As shown, the hammer head 3 facing the peripheral layer is used to guide the crushed stone and flushing liquid to flow toward the slag discharge pipe.

[0048] The width of the opening 513 is not less than the diameter of the guide tube 6, ensuring that gravel and flushing fluid can pass through smoothly without obstruction.

[0049] Preferably, as shown in the figure, in this embodiment, the height of the guide plate 502 close to the peripheral layer hammer head 3 is greater than the height of the end away from the peripheral layer hammer head 3, which is conducive to the smooth discharge of gravel, and the two ends of the guide plate 502 abut against the opposite sides of the opening 513 without any gap, and the guide plate 502 is not affected by the gravel.

[0050] The design of the support plate assembly 5 and the guide plate 502 enables the crushed rock to be more evenly distributed around the borehole, thus avoiding local excessive wear.

[0051] A slag discharge pipe is connected above the flow guide pipe 6 for slag discharge, forming a slag discharge system for the reverse circulation cluster down-the-hole hammer, which effectively improves the slag discharge efficiency and reduces the risk of borehole blockage.

[0052] In this embodiment, the reverse circulation cluster down-the-hole hammer adopts the existing double-layer drill pipe structure to support the entry of high-pressure gas and the discharge of waste gas and waste residue.

[0053] The clustered hammer layout and reverse circulation slag removal system significantly improve the drilling speed and efficiency, reduce the risk of drilling blockage, and shorten the downtime caused by equipment failure.

[0054] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention.

[0055] Any equivalent changes and modifications made by any technician in this field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. A hole-expanding reverse circulation cluster down-the-hole hammer, wherein the down-the-hole hammer is divided into two layers, the middle layer down-the-hole hammer (2) is telescopically connected to the middle part of the peripheral layer down-the-hole hammer (1), It is characterized by: The bottom surface of the peripheral layer down-the-hole hammer (1) is provided with a plurality of peripheral layer hammer heads (3) at intervals, and the bottom surface of the intermediate layer down-the-hole hammer (2) is provided with one or more intermediate layer hammer heads (4); A support plate assembly (5) having a shape matching the space is further provided in the space between two adjacent peripheral layer hammer heads (3) and the inner and outer edges of the peripheral layer down-the-hole hammer (1), and the support plate assembly (5) is installed on the bottom surface of the peripheral layer down-the-hole hammer (1); The support plate assembly (5) comprises a support plate body (501), one side of the support plate body (501) is further provided with an opening (513) extending vertically therethrough, and a flow guide tube (6) is further provided inside the opening (513) on a side away from the peripheral layer hammer head (3); The support plate assembly (5) further comprises a guide plate (502), the guide plate (502) being arranged inside the opening (513) on a side close to the peripheral layer hammer head (3), the two ends of the guide plate (502) being in contact with opposite surfaces inside the opening (513), being located above the bottom surface of the support plate body (501), and the height of the guide plate (502) at one end close to the peripheral layer hammer head (3) being not less than the height of the end away from the peripheral layer hammer head (3).

2. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The support plate body (501) and the guide plate (502) are processed separately.

3. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The support plate body (501) and the guide plate (502) are integrally formed.

4. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The support plate body (501) is flush with the peripheral layer hammer head (3).

5. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 4, characterized in that: The support plate body (501) is welded to the bottom surface of the peripheral layer down-the-hole hammer (1).

6. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The opening (513) is arc-shaped, and the opening (513) faces the peripheral layer hammer head (3).

7. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1 or 4, characterized in that: The height of the guide plate (502) at one end close to the peripheral layer hammer head (3) is greater than the height of the end away from the peripheral layer hammer head (3).

8. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The height interval between the middle layer down-the-hole hammer (2) and the peripheral layer down-the-hole hammer (1) is between 10-40 cm.

9. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The guide pipe (6) is connected to a slag discharge pipe above for slag discharge.

10. The hole enlarging reverse circulation cluster down-the-hole hammer according to claim 1, characterized in that: The reverse circulation cluster down-the-hole hammer adopts a double-layer drill pipe structure, which supports the entry of high-pressure gas and the discharge of waste gas and waste residue.

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