Rotary excavating drilling tool for breaking rocks

Abstract

The utility model relates to the technical field of pile foundation construction machinery, in particular to a rotary excavating drilling tool for breaking rocks, which comprises an outer cylinder, an inner cylinder, outer rotary excavating cutting teeth and inner rotary excavating cutting teeth, wherein a connecting sleeve matched with the outer diameter of the inner cylinder is fixed at the upper end of the outer cylinder; a plurality of positioning holes inserted into the connecting sleeve at different depths are formed in the side wall of the inner cylinder; a locking piece corresponding to the positioning hole is arranged on the connecting sleeve; and a plurality of outer guide strips are arranged on the outer wall of the outer cylinder. According to the utility model, the outer rotary excavating cutting teeth at the lower end of the outer cylinder are firstly contacted with an uncrushed stratum to execute primary coarse crushing, and the inner rotary excavating cutting teeth of the inner cylinder are used for treating materials loosened by the outer rotary excavating cutting teeth to perform secondary refined crushing. The division of work prevents the inner and outer cutting teeth from colliding with the hard stratum simultaneously, and reduces the overall energy consumption. In addition, the inner rotary excavating cutting pick and the outer rotary excavating cutting pick are convenient to overhaul and replace.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation construction machinery technology, and in particular to a rotary drilling tool for rock breaking. Background Technology

[0002] Conventional auger drills are commonly used engineering machinery for soil and rock extraction. However, when these drills penetrate rock, the auger blades are prone to damage due to direct contact with the rock under high pressure and torque. To avoid this problem, existing technologies use drills with external rotary cutting teeth for rock breaking and core drilling. However, existing drills have a double-layered structure, using rotary cutting teeth for rock breaking and crushing. During operation, the inner and outer cutting teeth simultaneously impact hard formations, requiring significant equipment power. Furthermore, this design is not conducive to finely crushing the core.

[0003] Therefore, improvements need to be made to the existing tubular drill to optimize and solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a rotary drilling tool for rock breaking, which solves the problem that conventional rotary drilling tools for rock breaking require a large amount of driving power when using double-layer cylinder drilling, as the inner and outer cutting teeth simultaneously collide with hard formations.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a rotary drilling tool for rock breaking, including an outer cylinder, an inner cylinder coaxially inserted into the outer cylinder, a plurality of external rotary drilling cutting teeth disposed at the bottom of the outer cylinder, and a plurality of internal rotary drilling cutting teeth disposed at the bottom of the inner cylinder.

[0007] A connecting sleeve adapted to the outer diameter of the inner cylinder is fixed at the upper end of the outer cylinder;

[0008] Multiple positioning holes are provided on the inner cylinder sidewall for inserting the connecting sleeve to different depths; a locking element corresponding to the positioning hole is provided on the connecting sleeve;

[0009] Multiple outer guide strips are provided on the outer wall of the outer cylinder.

[0010] Furthermore, multiple sets of outer guide strips are symmetrically arranged at the center of the outer peripheral wall of the outer cylinder, wherein each set of outer guide strips includes multiple vertically arranged and arc-shaped guide strips, and at least one reserved hole is also provided on the outer wall of the outer cylinder and in adjacent sets of outer guide strips.

[0011] Furthermore, multiple insertion slots are provided on the inner wall of the outer cylinder, and insertion keys that are axially adapted to the insertion slots are provided on the outer wall of the inner cylinder.

[0012] Furthermore, the depth of the insertion groove is less than the radial thickness of the insertion key.

[0013] Furthermore, the outer rotary cutting teeth are inclined outward relative to the outer cylinder, and the inner rotary cutting teeth are inclined outward relative to the inner cylinder.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0015] In this invention, the outer rotary cutting teeth at the lower end of the outer cylinder make initial contact with the unbroken strata for coarse crushing, while the inner rotary cutting teeth in the inner cylinder subsequently process the material loosened by the outer rotary cutting teeth for secondary fine crushing. This division of labor avoids the inner and outer cutting teeth simultaneously impacting hard strata, reducing overall energy consumption. Furthermore, it facilitates the inspection and replacement of both the inner and outer rotary cutting teeth. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the main body of the rotary drilling tool for rock breaking according to this utility model;

[0018] Figure 2 This is an internal schematic diagram of the rotary drilling tool for rock breaking according to this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the rotary drilling tool for rock breaking according to this utility model after adjustment;

[0020] Figure 4 for Figure 2 Schematic diagram of the cross section at point AA.

[0021] Explanation of reference numerals in the attached drawings: 1. Outer cylinder; 11. Reserved hole; 12. Outer guide strip; 13. Insertion groove; 2. Inner cylinder; 21. Positioning hole; 3. Connecting sleeve; 4. Locking component; 5. Outer rotary cutting teeth; 6. Insertion key; 7. Inner rotary cutting teeth. Detailed Implementation

[0022] refer to Figure 1 and Figure 2 This embodiment discloses a rotary drilling tool for rock breaking, including an outer cylinder 1, an inner cylinder 2 coaxially inserted into the outer cylinder 1, a plurality of external rotary drilling cutting teeth 5 installed at the bottom of the outer cylinder 1, and a plurality of internal rotary drilling cutting teeth 7 installed at the bottom of the inner cylinder 2.

[0023] When in use, it combines the synergistic effect of the outer and inner cylinders, making it suitable for efficient crushing and chip removal in complex strata. Specifically, the outer rotary cutting teeth 5 typically rotate at a higher speed or greater torque, mainly responsible for the initial crushing of rock strata. The outer rotary cutting teeth 5 are designed for cutting and loosening large pieces of material. The linear velocity of the inner rotary cutting teeth 7 is lower than that of the outer rotary cutting teeth 5, but it can rotate at different speeds to perform secondary refinement of the material after it has been crushed by the outer rotary cutting teeth 5, and guide the debris to the internal channel of the inner cylinder to achieve efficient chip removal.

[0024] refer to Figure 2 In this embodiment, a connecting sleeve 3 adapted to the outer diameter of the inner cylinder 2 is fixed at the upper end of the outer cylinder 1; multiple positioning holes 21 (specifically, a three-layer structure in the vertical design) are opened on the side wall of the inner cylinder 2 for inserting the connecting sleeve 3 to different depths; a locking member 4 corresponding to the positioning hole 21 is installed on the connecting sleeve 3; the outer rotary cutting tooth 5 is inclined outward relative to the outer cylinder 1, and the inner rotary cutting tooth 7 is inclined inward relative to the inner cylinder 2.

[0025] refer to Figure 3 In this embodiment, the inner cylinder 2 is adjusted upward relative to the outer cylinder 1, so that there is a certain height difference between the inner rotary cutting teeth 7 and the outer rotary cutting teeth 5. Whether the inner cylinder 2 and the outer cylinder 1 need to be adjusted to have a height difference structure depends on the usage scenario. For example, in rock mines, a height difference structure needs to be designed; if it is conventional soil, it can be maintained as follows. Figure 2 It can be used at the same level.

[0026] The outer cylinder 1 utilizes its lower outer rotary cutting teeth 5 to first contact the unbroken strata, performing preliminary coarse crushing (such as cutting rock). The inner cylinder 2 then uses its inner rotary cutting teeth 7 to process the material loosened by the outer rotary cutting teeth 5, performing secondary fine crushing. This division of labor avoids both inner and outer cutting teeth simultaneously impacting hard strata, reducing overall energy consumption. This optimized energy distribution allows the outer cylinder 1 to handle high-intensity crushing tasks, while the inner cylinder 2 focuses on chip removal and fine crushing, reducing wear on the inner cylinder cutting teeth.

[0027] In addition, it facilitates the height difference between the inner cylinder 2 and the outer cylinder 1 at the ends, and also facilitates the inspection and replacement of the inner rotary cutting teeth 7 and the outer rotary cutting teeth 5.

[0028] refer to Figure 1 and Figure 2 Multiple outer guide bars 12 are fixedly installed on the outer wall of the outer cylinder 1. In specific implementation, multiple sets of outer guide bars 12 are symmetrically arranged at the center of the outer peripheral wall of the outer cylinder 1, wherein each set of outer guide bars 12 includes multiple vertically arranged and arc-shaped guide bars.

[0029] The outer guide bar 12 is used to contact the borehole wall to form multi-point support, which reduces the deviation of the drill bit caused by uneven formation hardness or lateral force during drilling, and ensures that the drilling trajectory meets the design requirements.

[0030] Additionally, refer to Figure 1 Two reserved holes 11 are also provided on the outer wall of the outer cylinder 1 and located in the adjacent outer guide strip group. The reserved holes 11 can serve as temporary chip removal channels to prevent chip accumulation from causing blockage of the gap between the inner and outer cylinders, thereby reducing frictional resistance and energy loss.

[0031] refer to Figure 4 In this embodiment, a plurality of insertion slots 13 are also installed on the inner wall of the outer cylinder, and an insertion key 6 that is axially adapted to the insertion slots 13 is fixedly installed on the outer wall of the inner cylinder 2; wherein the depth of the insertion slots 13 is less than the radial thickness of the insertion key 6.

[0032] refer to Figure 3 When the inner cylinder 2 is adjusted upward relative to the outer cylinder 1, the torque force between the inner cylinder 2 and the outer cylinder 1 can still be effectively transmitted using the plug key 6 and the plug groove 13; in addition, the coaxiality between the inner cylinder 2 and the outer cylinder 1 can be guaranteed.

[0033] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A rotary drilling tool for breaking rock, characterized by: The utility model relates to a rotary excavator, including outer tube (1), the inner tube (2) of coaxial insertion in outer tube (1) inside, the plurality of outer rotary excavating pick (5) of setting in outer tube (1) bottom, the plurality of inner rotary excavating pick (7) of setting in inner tube (2) bottom; Wherein the upper end of the outer tube (1) is fixed with a connecting sleeve (3) matched with the outer diameter of the inner tube (2); A plurality of positioning holes (21) are formed on the side wall of the inner tube (2) and correspond to different depths of the connecting sleeve (3); a locking member (4) is arranged on the connecting sleeve (3) and corresponds to the positioning holes (21); A plurality of outer guide strips (12) are arranged on the outer wall of the outer tube (1).

2. The rotary drilling tool for breaking rock according to claim 1, characterized by: A plurality of outer guide strips (12) are symmetrically arranged on the outer peripheral wall of the outer tube (1), and each group of outer guide strips (12) includes a plurality of vertically arranged and arc-shaped guide strips; at least one reserved hole (11) is further formed on the outer wall of the outer tube (1) and located between adjacent groups of outer guide strips.

3. The rotary digging tool for breaking rock of claim 1, wherein: A plurality of plug-in grooves (13) are further arranged on the inner wall of the outer tube (1), and a plug-in key (6) is arranged on the outer wall of the inner tube (2) and axially matched with the plug-in grooves (13).

4. The rotary digging tool for breaking rock according to claim 3, characterized by: The depth of the plug-in groove (13) is less than the radial thickness of the plug-in key (6).

5. The rotary digging tool for breaking rock of claim 1, wherein: The outer rotary excavating pick (5) is inclined outward relative to the outer tube (1), and the inner rotary excavating pick (7) is inclined outward relative to the inner tube (2).

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