Detachable double-layer barrel drill

Abstract

The utility model discloses a detachable double-layer barrel drill, which relates to the technical field of drilling tool instruments and comprises an inner barrel and an outer barrel fixedly sleeved outside the inner barrel, and an annular cavity is arranged between the outer barrel and the inner barrel. The inner barrel comprises a first inner barrel and a second inner barrel which are coaxially arranged in the axial direction, one end of the first inner barrel and one end of the outer barrel are fixedly connected to a connecting part, and the other end of the first inner barrel is detachably connected with one end of the second inner barrel; the other end of the second inner cylinder axially exceeds the other end of the outer cylinder body; cutting parts are arranged at the ends, deviating from the connecting part, of the outer barrel and the second inner barrel. According to the detachable double-layer barrel drill, the flexibility is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling tools, in particular to a detachable double-layer barrel drill. Background Art

[0002] At present, complex geology is often encountered during the construction of engineering piles and supporting piles in construction projects. In particular, when encountering hard geology such as medium-slightly weathered boulders, granite, and oblique-section rock formations, double-layer barrel drills are usually used for drilling; the double-layer barrel drill usually includes an outer and inner barrel drill, the inner barrel drill cuts in first, and the outer barrel drill follows up with annular cutting to release the rock confining pressure, and then performs rotary excavation of the rock formation; such as the double-layer barrel drill provided by patent CN101343982A, which has an inner barrel body and an outer barrel body, wherein the working height of the lower end of the inner barrel body is lower than the working height of the outer barrel body, and the cutting tool at the lower end of the inner barrel body first enters a priority working state to reduce the drilling resistance; however, the sizes of priority working drilling required for different scenarios are different. If the cutting tool at the lower end of the inner barrel body is required to drill different sizes, double-layer barrel drills of different sizes need to be replaced, so double-layer barrel drills of different specifications need to be prepared, and the production cost is high. Utility Model Content

[0003] The purpose of the utility model is to provide a detachable double-layer barrel drill to solve the problems existing in the above-mentioned prior art, improve flexibility and reduce production costs.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a detachable double-layer barrel drill, comprising an inner barrel and an outer barrel fixedly sleeved outside the inner barrel, an annular cavity being provided between the outer barrel and the inner barrel; the inner barrel axially comprises a first inner barrel and a second inner barrel coaxially arranged, one end of the first inner barrel and one end of the outer barrel are fixedly connected to a connecting component, the other end of the first inner barrel and one end of the second inner barrel can be detachably connected; the other end of the second inner barrel axially protrudes beyond the other end of the outer barrel; a cutting portion is provided along one end of the outer barrel and the second inner barrel away from the connecting component.

[0006] Preferably, one end of the first inner cylinder facing away from the connecting component is sleeved on the outer circumferential surface of one end of the second inner cylinder, and a plurality of limiting holes are circumferentially arranged on two end surfaces of the first inner cylinder and the second inner cylinder connected to each other; the limiting holes on the first inner cylinder can be opposite to the limiting holes on the second inner cylinder in pairs, and limiting pins are used to be arranged in the two opposite limiting holes to fix the relative positions of the first inner cylinder and the second inner cylinder.

[0007] Preferably, a plurality of guide grooves are arranged in the circumferential direction on the outer circumferential surface of one end of the second inner cylinder connected to the first inner cylinder, and a plurality of guide blocks are arranged in the circumferential direction on the outer circumferential surface of one end of the first inner cylinder connected to the second inner cylinder; the first inner cylinder is sleeved outside the second inner cylinder, and the plurality of guide blocks can be respectively embedded in the plurality of guide grooves, so that the limiting holes on the first inner cylinder and the limiting holes on the second inner cylinder are opposite to each other.

[0008] Preferably, the outer cylinder is coaxially sleeved outside the first inner cylinder, and the annular cavity is defined between the outer cylinder and the first inner cylinder; and the second inner cylinder extends beyond the outer cylinder.

[0009] Preferably, a plurality of reinforcing plates are circumferentially arranged on a side of the annular cavity away from the connecting component, and two ends of each reinforcing plate are respectively fixedly connected to the outer wall of the first inner cylinder and the inner wall of the outer cylinder.

[0010] Preferably, the cutting portion is provided on a side of each reinforcing plate facing away from the connecting component.

[0011] Preferably, the cutting portion comprises a plurality of drill teeth; the plurality of drill teeth on the end of the outer cylinder and the second inner cylinder away from the connecting component are distributed circumferentially; the plurality of drill teeth on each reinforcing plate are distributed radially along the annular cavity.

[0012] Preferably, the outer wall surface of the outer cylinder and the outer wall surface of the second inner cylinder are provided with spirally distributed wear-resistant guide strips.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] The utility model provides a detachable double-drum drill, in which the outer cylinder and the inner cylinder can be connected to an external drive under the action of a connecting component; since the second inner cylinder extends beyond the outer cylinder, the second inner cylinder can be put into a working state first to drill holes, thereby reducing subsequent drilling resistance; in addition, by configuring the inner cylinder to be a first inner cylinder and a second inner cylinder that can be detachably connected, the drilling requirements of different sizes can be met by replacing the second inner cylinders of different sizes or different outer cylinders and the first inner cylinder, without replacing the entire double-drum drill, thereby improving the flexibility of use and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a detachable double-layer barrel drill provided in Example 1;

[0017] Figure 2 A schematic diagram of the structure of the inner cylinder provided in Example 1;

[0018] Figure 3 This is a schematic diagram of the use status of the detachable double-layer barrel drill provided in Example 1.

[0019] In the figure: 1-detachable double-layer barrel drill; 10-inner barrel; 11-first inner barrel; 12-second inner barrel; 13-limiting hole; 14-limiting pin; 15-guide block; 20-outer barrel; 30-annular cavity; 40-connecting component; 50-cutting part; 60-reinforcement plate; 70-wear-resistant guide strip. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The purpose of the utility model is to provide a detachable double-layer barrel drill to solve the problems existing in the above-mentioned prior art, improve flexibility and reduce production costs.

[0022] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Embodiment 1

[0024] This embodiment provides a detachable double-layer barrel drill 1, see Figure 1-Figure 3 , including an inner cylinder 10 and an outer cylinder 20 fixedly sleeved outside the inner cylinder 10, with an annular cavity 30 between the outer cylinder 20 and the inner cylinder 10; the inner cylinder 10 includes a first inner cylinder 11 and a second inner cylinder 12 coaxially arranged in the axial direction, one end of the first inner cylinder 11 and one end of the outer cylinder 20 are fixedly connected to a connecting component 40, and the other end of the first inner cylinder 11 and one end of the second inner cylinder 12 can be detachably connected; the other end of the second inner cylinder 12 extends beyond the other end of the outer cylinder 20 in the axial direction; the outer cylinder 20 and the second inner cylinder 12 are both provided with a cutting portion 50 along one end away from the connecting component 40.

[0025] The outer cylinder 20 and the inner cylinder 10 can be connected to an external drive under the action of the connecting component 40; since the second inner cylinder 12 extends beyond the outer cylinder 20, the second inner cylinder 12 can enter the working state first for drilling, thereby reducing subsequent drilling resistance; in addition, by configuring the inner cylinder 10 to be a first inner cylinder 11 and a second inner cylinder 12 that can be detachably connected, by replacing the second inner cylinder 12 of different sizes or different outer cylinders 20 and the first inner cylinder 11, the drilling requirements of different sizes can be met without replacing the entire double-layer cylinder drill, thereby improving the flexibility of use and saving costs.

[0026] The connecting component 40 may adopt a conventional connecting structure of a double-layer barrel drill.

[0027] In the optional scheme of this embodiment, it is more preferred that one end of the first inner cylinder 11 facing away from the connecting component 40 is sleeved on the outer circumferential surface of one end of the second inner cylinder 12, and a plurality of limiting holes 13 are circumferentially arranged on the two end surfaces of the first inner cylinder 11 and the second inner cylinder 12 connected to each other; the limiting holes 13 on the first inner cylinder 11 can be opposite to the limiting holes 13 on the second inner cylinder 12 in pairs, and the two opposite limiting holes 13 are used to set limiting pins 14 to fix the relative positions of the first inner cylinder 11 and the second inner cylinder 12; the sleeved connection relationship facilitates coaxial positioning and installation. In addition, by setting a plurality of limiting holes 13 and fixing them through the limiting pins 14, the stability of the connection is guaranteed.

[0028] Among the optional solutions of this embodiment, it is more preferred to refer to Figure 2 In order to facilitate the relative positioning of the limiting holes 13 on the first inner cylinder 11 and the second inner cylinder 12, a plurality of guide grooves are arranged on the outer circumferential surface of one end of the second inner cylinder 12 connected to the first inner cylinder 11, and a plurality of guide blocks 15 are arranged on the outer circumferential surface of one end of the first inner cylinder 11 connected to the second inner cylinder 12; the first inner cylinder 11 is sleeved outside the second inner cylinder 12, and when the plurality of guide blocks 15 can be respectively embedded in the plurality of guide grooves, the limiting holes 13 on the first inner cylinder 11 and the limiting holes 13 on the second inner cylinder 12 are opposite to each other, which is convenient for installation and positioning; in addition, guide grooves can be arranged on the first inner cylinder 11, and guide blocks 15 can be arranged on the second inner cylinder 12, which can also complete the guiding positioning.

[0029] In the optional scheme of this embodiment, it is more preferred that the outer cylinder 20 is coaxially sleeved outside the first inner cylinder 11, and an annular cavity 30 is provided between the outer cylinder 20 and the first inner cylinder 11, that is, the second inner cylinder 12, except for the end connected to the first inner cylinder 11, is extended beyond the outer cylinder 20, and the ends of the first inner cylinder 11 and the outer cylinder 20 can be flush, so that the second inner cylinder 12 can work first to drill holes to reduce subsequent drilling resistance, and the second inner cylinder 12 can also be used as a guide, see Figure 3That is, when drilling, a pilot hole can be drilled by a rotary drilling rig, and then the second inner cylinder 12 is inserted into the pilot hole to play a guiding role, thereby avoiding subsequent drilling deviation; and since over-digging is strictly prohibited in pile hole construction, when the bottom end of the second inner cylinder 12 reaches the designed hole depth, the second inner cylinder 12 is disassembled and removed and then lowered into the pile hole again, and the section corresponding to the annular cavity 30 is drilled to the designed hole depth, thereby reducing construction costs.

[0030] In the optional scheme of this embodiment, it is more preferred that a plurality of reinforcing plates 60 are circumferentially arranged on the side of the annular cavity 30 away from the connecting component 40, and the two ends of each reinforcing plate 60 are respectively fixedly connected to the outer wall of the first inner cylinder 11 and the inner wall of the outer cylinder body 20; by providing a plurality of reinforcing plates 60, the overall strength can be improved.

[0031] In the optional solution of this embodiment, more preferably, each reinforcing plate 60 is provided with a cutting portion 50 on a side facing away from the connecting component 40 , so as to perform drilling and cutting between the outer cylinder 20 and the inner cylinder 10 .

[0032] In the optional scheme of this embodiment, it is more preferred that the cutting portion 50 includes a plurality of drill teeth; the plurality of drill teeth on the end of the outer cylinder 20 and the second inner cylinder 12 away from the connecting component 40 are distributed along the circumferential direction; the plurality of drill teeth on each reinforcing plate 60 are distributed along the radial direction of the annular cavity 30, so as to realize full-section drilling and cutting between the outer cylinder 20 and the inner cylinder 10, which greatly improves the drilling efficiency and can effectively avoid the occurrence of drill jamming accidents.

[0033] In the optional scheme of this embodiment, it is more preferred that spirally distributed wear-resistant guide strips 70 are provided on the outer wall surface of the outer cylinder 20 and the outer wall surface of the second inner cylinder 12. By providing the spirally distributed wear-resistant guide strips 70, the wear resistance is improved, and the spiral distribution can prevent rock cuttings from falling out, while improving the slag carrying capacity of the drilling tool.

[0034] In addition, each component of the detachable double-layer barrel drill 1 provided in this embodiment is made of conventional materials used in this field, and can meet the requirements of usage strength and service life.

[0035] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A detachable double-layer barrel drill, characterized in that: The invention comprises an inner cylinder (10) and an outer cylinder (20) fixedly sleeved outside the inner cylinder (10), wherein an annular cavity (30) is provided between the outer cylinder (20) and the inner cylinder (10); the inner cylinder (10) comprises a first inner cylinder (11) and a second inner cylinder (12) coaxially arranged in the axial direction, wherein one end of the first inner cylinder (11) and one end of the outer cylinder (20) are fixedly connected to a connecting component (40), and the other end of the first inner cylinder (11) and one end of the second inner cylinder (12) are detachably connected; the other end of the second inner cylinder (12) protrudes from the other end of the outer cylinder (20) in the axial direction; and a cutting portion (50) is provided along the ends of the outer cylinder (20) and the second inner cylinder (12) facing away from the connecting component (40).

2. The detachable double-layer barrel drill according to claim 1, characterized in that: One end of the first inner cylinder (11) facing away from the connecting component (40) is sleeved on the outer circumferential surface of one end of the second inner cylinder (12), and a plurality of limiting holes (13) are arranged along the circumferential direction on the two end surfaces of the first inner cylinder (11) and the second inner cylinder (12) connected to each other; the limiting holes (13) on the first inner cylinder (11) can be opposite to the limiting holes (13) on the second inner cylinder (12) in pairs, and limiting pins (14) are used to be arranged in the two opposite limiting holes (13) to fix the relative positions of the first inner cylinder (11) and the second inner cylinder (12).

3. The detachable double-layer barrel drill according to claim 2, characterized in that: A plurality of guide grooves are arranged along the circumferential direction on the outer circumferential surface of one end of the second inner cylinder (12) connected to the first inner cylinder (11), and a plurality of guide blocks (15) are arranged along the circumferential direction on the outer circumferential surface of one end of the first inner cylinder (11) connected to the second inner cylinder (12); the first inner cylinder (11) is sleeved outside the second inner cylinder (12), and the plurality of guide blocks (15) can be respectively embedded in the plurality of guide grooves, so that the limiting holes (13) on the first inner cylinder (11) and the limiting holes (13) on the second inner cylinder (12) are opposite to each other.

4. The detachable double-layer barrel drill according to claim 1, characterized in that: The outer cylinder (20) is coaxially sleeved outside the first inner cylinder (11), and the annular cavity (30) is provided between the outer cylinder (20) and the first inner cylinder (11).

5. The detachable double-layer barrel drill according to claim 4, characterized in that: A plurality of reinforcing plates (60) are circumferentially arranged on a side of the annular cavity (30) away from the connecting component (40), and two ends of each reinforcing plate (60) are respectively fixedly connected to the outer wall of the first inner cylinder (11) and the inner wall of the outer cylinder body (20).

6. The detachable double-layer barrel drill according to claim 5, characterized in that: The cutting portion (50) is provided on a side of each reinforcing plate (60) facing away from the connecting component (40).

7. The detachable double-layer barrel drill according to claim 6, characterized in that: The cutting portion (50) comprises a plurality of drill teeth; the plurality of drill teeth on one end of the outer cylinder (20) and the second inner cylinder (12) away from the connecting component (40) are distributed in the circumferential direction; and the plurality of drill teeth on each of the reinforcing plates (60) are distributed in the radial direction of the annular cavity (30).

8. The detachable double-layer barrel drill according to claim 1, characterized in that: The outer wall surface of the outer cylinder (20) and the outer wall surface of the second inner cylinder (12) are provided with spirally distributed wear-resistant guide strips (70).

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