Large-diameter straight drill rod of down-the-hole hammer

Abstract

The utility model relates to a down-the-hole hammer large-caliber straight cylinder drill rod which comprises a straight cylinder body, a spiral blade used for deslagging is arranged on the outer side of the straight cylinder body, the spiral blade is designed spirally along the outer circumferential face of the straight cylinder body and is combined with the straight cylinder body to form a spiral rod structure, and the diameter of the straight cylinder body is larger than the width of the spiral blade. The ratio of the diameter of the straight cylinder body to the width of the spiral blade is (5.2-10.2): 1, so that a large-caliber straight cylinder drill rod structure is formed; by reducing the deslagging amount of the spiral blades and improving the deslagging rate, the spiral drill rod has high slag pushing capacity under the balance / non-balance condition, meanwhile, the bearing capacity of the drill rod in the working process is reduced, the connecting structure of the drill rod is protected, the situation of slag upheaval and hole blocking is not prone to occurring, and the spiral drill rod is more suitable for deep strata such as a rock layer and a gravel layer.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling rigs, in particular to a large-diameter straight drill rod of a down-the-hole hammer. Background Art

[0002] The auger of a pile driver is a type of piling equipment that uses a power head to drive the drill bit into the ground to drill a hole. The auger typically consists of a guide shaft, a male connector, spiral blades, and a female connector. During operation, frictional resistance is generated between the drill cuttings on the spiral blades and the blade surface, which is discharged out of the hole as the spiral rises. However, the blade surface of traditional auger drills is relatively large. This design gives the auger a strong ability to push cuttings under unbalanced conditions, but a weak ability to carry cuttings, which can easily lead to cuttings blocking the hole. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the technical solution adopted by the present invention is: a large-diameter straight drill rod for a down-the-hole hammer, including a straight barrel body, and a spiral blade for slag discharge is provided on the outside of the straight barrel body. The spiral blade is spirally designed on the outer circumferential surface of the straight barrel body and is combined with the straight barrel body to form a spiral rod structure. The diameter of the straight barrel body is greater than the width of the spiral blade. The ratio of the diameter of the straight barrel body to the width of the spiral blade is 5.2 to 10.2:1, forming a large-diameter straight barrel drill rod structure.

[0004] By adopting the above technical solution, the large-diameter straight barrel body improves the balance, and the narrower spiral blades enable the spiral drill rod to have a stronger slag pushing ability under balanced / unbalanced conditions. At the same time, it reduces the bearing capacity of the drill rod during operation, protects the connection structure of the drill rod, and is less likely to cause slag congestion and hole blockage. It is more suitable for deep rock environments with high density such as rock layers and gravel layers.

[0005] The utility model is further configured as follows: the straight cylinder body includes an outer rod, an inner tube, a side baffle, a connecting rod, a convex connector and a concave connector, the two ends of the outer rod are respectively connected to the convex connector and the concave connector through the side baffles, and the inner tube, the convex connector and the concave connector are fixedly connected to the inner side of the outer rod through the connecting rod, the convex connector is provided with a connecting column for an external power head, and a first air cavity for conveying gas, the concave connector is provided with a connecting groove for an external impact hammer, and a second air cavity connected to the connecting groove, the two ends of the inner tube are respectively connected to the convex connector and the concave connector, and the first air cavity and the second air cavity are connected.

[0006] By adopting the above technical solution, both the male connector and the female connector are made by forging process, and the male connector and the female connector are welded to the outer rod through the side baffle. There is no need to significantly change the structure of the male connector and the female connector, which greatly reduces the overall weight of the drill rod and reduces the production cost.

[0007] The utility model is further configured such that symmetrically distributed side tubes for installing positioning bolts are provided between the outer rod and the female connector, and first positioning holes coaxially distributed with the side tubes are provided on both sides of the female connector, and the first positioning holes are communicated with the connecting groove.

[0008] Furthermore, the side tube is provided with a countersunk hole coaxially distributed with the first positioning hole, the connecting groove is a hexagonal groove, and the first positioning holes are parallelly distributed on both sides of the hexagonal groove.

[0009] With the above technical solution, the side tube is welded between the outer rod and the female connector, and the side tubes are staggered and distributed on both sides of the connecting rod, thereby improving the connection strength between the outer rod and the female connector. When the female connector is clamped to the impact hammer, the positioning bolt is passed through the side tube, the first positioning hole, and the side tube in sequence, and the female connector and the impact hammer are clamped at the same time to prevent the drill rod and the impact hammer from separating.

[0010] The present invention is further configured such that the female connector is provided with a connecting groove adapted to the outer shape of the connecting column, and second positioning holes corresponding to the first positioning holes are provided on both sides of the connecting column.

[0011] By adopting the above technical solution, according to the required drilling depth, multiple groups of drill rods are connected end to end to increase the total length of the drill rods, which has a wide range of applications.

[0012] The utility model is further configured such that the convex connector includes a sleeve, and connecting columns and a base plate welded to both ends of the sleeve, a connecting rod distributed circumferentially is provided between the sleeve and the outer rod, the sleeve, the connecting columns and the base plate are combined to form a first air cavity, the inner tube extends through the base plate into the first air cavity, and the connecting column is provided with an air hole connected to the first air cavity.

[0013] Furthermore, the connecting column is an external hexagonal joint, and second positioning holes distributed in parallel are provided on both sides of the external hexagonal joint.

[0014] Using the above technical solution, connecting columns and base plates are welded at both ends of the sleeve to form a sealed first air cavity, which improves the pneumatic efficiency. The high-pressure gas generated by the power head flows to the impact hammer through the air hole, the first air cavity, the inner tube, and the second air cavity in sequence, thereby achieving the effect of high-pressure soil and debris discharge, making the bottom of the hole clean, without secondary crushing, and improving the drilling process.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This new model uses a large-diameter outer rod to reduce the amount of slag discharged by the spiral blades, while reducing the bearing capacity of the drill rod during operation, protecting the connection structure of the drill rod, and is less likely to cause slag congestion and hole blocking. It is more suitable for deep rock formations such as rock layers and gravel layers;

[0017] 2. Both the male and female connectors are made by forging, and are welded to the outer rod through side baffles, which increases the material and volume of the male and female connectors, greatly reducing the overall weight of the drill rod and lowering production costs.

[0018] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a half-section view of the utility model;

[0020] Figure 2 For the utility model Figure 1 A partial enlarged view of the A direction view;

[0021] Figure 3 For the utility model Figure 2 The stepped section view of the B direction;

[0022] Figure 4 For the utility model Figure 1 A partial enlarged view of the C-direction view;

[0023] Figure 5 For the utility model Figure 4 Sectional view in the D direction;

[0024] Wherein: 1-outer rod, 2-inner tube, 3-side baffle, 4-connecting rod, 5-male connector, 6-female connector, 7-spiral blade, 8-side tube, 11-first air cavity, 12-second air cavity, 51-connecting column, 52-second positioning hole, 53-sleeve, 54-bottom plate, 55-air hole, 61-connecting groove, 62-first positioning hole; DETAILED DESCRIPTION

[0025] like Figure 1 As shown, the utility model provides a first embodiment of a large-diameter straight drill rod for a down-the-hole hammer, comprising a straight body, wherein a spiral blade 7 for slag removal is provided on the outside of the straight body, and the spiral blade 7 is spirally designed along the outer circumferential surface of the straight body and is combined with the straight body to form a spiral rod structure. The diameter of the straight body is greater than the width of the spiral blade 7, and the ratio of the diameter d of the straight body to the width h of the spiral blade 7 is 5.2:1, forming a large-diameter straight drill rod structure.

[0026] Combine Figure 2 、 4As shown, in this embodiment, the straight cylinder body includes an outer rod 1, an inner tube 2, a side baffle 3, a connecting rod 4, a male connector 5 and a female connector 6. The outer side of the outer rod 1 is provided with a spiral blade 7 for slag discharge. The two ends of the outer rod 1 are respectively welded with a male connector 5 and a female connector 6 through the side baffle 3, and the inner tube 2, the male connector 5 and the female connector 6 are welded to the inner side of the outer rod 1 through the connecting rod 4. The male connector 5 is provided with a connecting column 51 for an external power head and a first air cavity 11 for conveying gas. The female connector 6 is provided with a connecting groove 61 for an external impact hammer and a second air cavity 12 connected to the connecting groove 61. The two ends of the inner tube 2 are respectively connected to the male connector 5 and the female connector 6, and the first air cavity 11 and the second air cavity 12 are connected.

[0027] Combine Figure 2 、 3 As shown, in this embodiment, symmetrically distributed side tubes 8 for installing positioning bolts are provided between the outer rod 1 and the female connector 6. First positioning holes 62 coaxially distributed with the side tubes 8 are provided on both sides of the female connector 6, and the first positioning holes 62 are communicated with the connecting groove 61. The side tube 8 is provided with a countersunk hole coaxially distributed with the first positioning hole 62. The connecting groove 61 is an inner hexagonal groove. The first positioning holes 62 are parallelly distributed on both sides of the inner hexagonal groove. The side tube 8 is welded between the outer rod 1 and the female connector 6, and the side tubes 8 are staggered and distributed on both sides of the connecting rod 4, thereby improving the connection strength between the outer rod 1 and the female connector 6. When the female connector 6 is clamped with the impact hammer, the positioning bolts are passed through the side tube 8, the first positioning hole 62, and the side tube 8 in sequence, and at the same time, the female connector 6 is clamped with the impact hammer to avoid separation of the drill rod and the impact hammer.

[0028] In this embodiment, the female connector 6 is provided with a connecting groove 61 adapted to the outer shape of the connecting column 51, and second positioning holes 52 corresponding to the first positioning holes 62 are provided on both sides of the connecting column 51. According to the required drilling depth, multiple groups of drill rods are used to increase the total length of the drill rods in an end-to-end manner, which has a wide range of applications.

[0029] Combine Figure 4 、 5 As shown, in this embodiment, the convex connector 5 includes a sleeve 53, and a connecting column 51 and a base plate 54 welded to both ends of the sleeve 53. A connecting rod 4 distributed in a circumference is provided between the sleeve 53 and the outer rod 1. The sleeve 53, the connecting column 51 and the base plate 54 are combined to form a first air cavity 11. The inner tube 2 extends into the first air cavity 11 through the base plate 54, and the connecting column 51 is provided with an air hole 55 connected to the first air cavity 11. The connecting column 51 is an external hexagonal joint, and second positioning holes 52 distributed in parallel are provided on both sides of the external hexagonal joint. The connecting column 51 and the base plate 54 are welded to both ends of the sleeve 53 to form a sealed first air cavity 11, thereby improving aerodynamic efficiency.

[0030] The utility model provides a second embodiment of a large-diameter straight drill pipe for a down-the-hole hammer. The second embodiment is different from the first embodiment in that the ratio of the diameter d of the straight barrel body to the width h of the spiral blade 7 is 10.2:1.

[0031] The working principle of the present utility model is as follows: the two ends of the drill rod are connected to the power head and the impact hammer through the male connector 5 and the female connector 6 respectively, the drill rod is driven by the power head to rotate by itself, and friction resistance is generated between the drill cuttings on the spiral blade 7 and the spiral blade surface, and is discharged out of the hole as the spiral rising angle increases. During this period, the high-pressure gas generated by the power head flows to the impact hammer through the air hole 55, the first air cavity 11, the inner tube 2, and the second air cavity 12 in sequence, thereby achieving the effect of high-pressure soil and debris discharge, making the bottom of the hole of the dry sinking action clean, without secondary crushing, and improving the drilling process.

[0032] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large-diameter straight drill pipe for a down-the-hole hammer, characterized in that: The invention comprises a straight cylindrical body, wherein a spiral blade (7) for slag discharge is provided on the outside of the straight cylindrical body, wherein the spiral blade (7) is spirally designed along the outer circumferential surface of the straight cylindrical body and is combined with the straight cylindrical body to form a spiral rod structure, wherein the diameter of the straight cylindrical body is greater than the width of the spiral blade (7), and the ratio of the diameter of the straight cylindrical body to the width of the spiral blade (7) is 5.2 to 10.2:1, thereby forming a large-diameter straight cylindrical drill rod structure.

2. A large-diameter straight drill pipe for a down-the-hole hammer according to claim 1, characterized in that: The straight cylinder body comprises an outer rod (1), an inner tube (2), a side baffle (3), a connecting rod (4), a male connector (5) and a female connector (6); the two ends of the outer rod (1) are respectively connected to the male connector (5) and the female connector (6) through the side baffle (3); the inner tube (2), the male connector (5) and the female connector (6) are fixedly connected to the inner side of the outer rod (1) through the connecting rod (4); the male connector (5) is provided with a connecting column (51) for externally connecting a power head and a first air cavity (11) for conveying gas; the female connector (6) is provided with a connecting groove (61) for externally connecting an impact hammer and a second air cavity (12) connected to the connecting groove (61); the two ends of the inner tube (2) are respectively connected to the male connector (5) and the female connector (6), and the first air cavity (11) and the second air cavity (12) are connected.

3. A large-diameter straight drill pipe for a down-the-hole hammer according to claim 2, characterized in that: A symmetrically distributed side tube (8) for installing a positioning bolt is provided between the outer rod (1) and the female connector (6); first positioning holes (62) coaxially distributed with the side tube (8) are provided on both sides of the female connector (6), and the first positioning holes (62) are communicated with the connecting groove (61).

4. A large-diameter straight drill pipe for a down-the-hole hammer according to claim 3, characterized in that: The side tube (8) is provided with a countersunk hole coaxially distributed with the first positioning hole (62); the connecting groove (61) is a hexagonal groove; and the first positioning holes (62) are parallelly distributed on both sides of the hexagonal groove.

5. The large-diameter straight drill pipe for a down-the-hole hammer according to claim 2, characterized in that: The female connector (6) is provided with a connecting groove (61) adapted to the outer shape of the connecting column (51), and second positioning holes (52) corresponding to the first positioning holes (62) are provided on both sides of the connecting column (51).

6. The large-diameter straight drill pipe for a down-the-hole hammer according to claim 2, characterized in that: The male connector (5) comprises a sleeve (53), a connecting column (51) and a bottom plate (54) welded to both ends of the sleeve (53), a connecting rod (4) distributed in a circumferential manner is provided between the sleeve (53) and the outer rod (1), the sleeve (53), the connecting column (51) and the bottom plate (54) are combined to form a first air cavity (11), the inner tube (2) passes through the bottom plate (54) and extends into the first air cavity (11), and the connecting column (51) is provided with an air hole (55) communicating with the first air cavity (11).

7. A large-diameter straight drill pipe for a down-the-hole hammer according to claim 6, characterized in that: The connecting column (51) is an external hexagonal joint, and second positioning holes (52) distributed in parallel are provided on both sides of the external hexagonal joint.

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