Drill bit of rotary excavating barrel drill for fishing waste rocks and fragmented rocks

Abstract

The utility model relates to a drill bit of a rotary excavating barrel drill for fishing waste rocks and fragmented rocks. The drill bit comprises a drill barrel, an inner barrel, two fixed steel rings and a plurality of steel strands. And the inner cylinder is detachably arranged in the drilling cylinder. And the two fixed steel rings are arranged in the inner cylinder and are respectively arranged at the two ends of the inner cylinder. The steel strand is divided into an anchoring section and a fishing section connected with the anchoring section, one end of the anchoring section is anchored on one fixing steel ring, the other end of the anchoring section is anchored on the other fixing steel ring close to the head of the drill barrel, and the fishing section and the other end of the anchoring section are bent at an acute included angle and extend obliquely towards the direction of the central axis of the inner barrel. The multiple steel strands are distributed in the circumferential direction of the fixed steel ring at intervals. Through mutual cooperation of the fishing sections of the plurality of steel strands with certain elastic performance and sufficient rigidity, the broken rock blocks can open the fishing sections due to the elastic performance of the steel strands to be smoothly squeezed into the inner cylinder, and the fishing sections are restored to the original angle due to the rigidity of the steel strands, so that the broken rock blocks in the inner cylinder are prevented from falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation construction, in particular to a rotary drilling barrel drill bit for scooping out waste rocks and broken rock blocks. Background Art

[0002] Existing rotary drilling rigs are usually hollow cylindrical drills with an open lower end. During the rock breaking and drilling process of the rotary drilling rig, most of the rock formations are uniform and complete. After the rock is broken, the complete cylindrical rock blocks are stuck in the drill barrel under the rotation and cutting of the drilling rig. After the hole is completed and the drill is lifted, the ground drilling rig repeatedly rotates the drill barrel to make the rock blocks stuck in the barrel fall out as a whole.

[0003] However, when encountering a situation where some rock formations are uneven and the rock formations are strong, conventional rotary drilling barrels cannot form complete rock blocks after breaking the rock. Therefore, the rock blocks cannot be stuck in the drill barrel through the friction between the drilled rock and the inner wall of the barrel and will not fall off. Instead, they will break into several parts and fall back into the hole, causing obstruction in the drilling hole. Utility Model Content

[0004] The utility model aims to provide a rotary drilling barrel drill bit for scooping up waste rock and broken rock blocks, which can cooperate with each other through the scooping sections of multiple steel strands with certain elastic properties and sufficient rigidity, so that the broken rock blocks can be smoothly squeezed into the inner barrel by the scooping sections being stretched open by the elastic properties of the steel strands, and the scooping sections can be restored to their original angles due to the rigidity of the steel strands, thereby preventing the broken rock blocks squeezed into the inner barrel from falling, thereby achieving the purpose of scooping up and collecting waste rock and broken rock blocks in the borehole and clearing obstacles in the borehole.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a rotary drilling rig bit for scooping out waste rock and broken rock blocks, comprising:

[0006] Drill barrel;

[0007] An inner cylinder, detachably disposed in the drill cylinder;

[0008] Two fixed steel rings are arranged in the inner cylinder and at two ends of the inner cylinder respectively.

[0009] A plurality of steel strands are divided into an anchoring section and a scooping section connected to the anchoring section, one end of the anchoring section is anchored on one of the fixed steel rings, and the other end of the anchoring section is anchored on another of the fixed steel rings close to the drill pipe head, the scooping section and the other end of the anchoring section are bent at an acute angle and extend obliquely toward the central axis of the inner tube, and the plurality of steel strands are distributed at intervals along the circumference of the fixed steel ring.

[0010] Optionally, the fixed steel ring is provided with a plurality of anchor holes spaced apart along the circumferential direction, the plurality of anchor holes correspond one-to-one to the positions of a plurality of steel strands, and both ends of the anchoring sections of the steel strands are respectively anchored in the corresponding anchor holes.

[0011] Optionally, a central axis of the anchoring hole and a central axis of the anchoring section are parallel to a central axis of the inner tube.

[0012] Optionally, the distance between two adjacent anchoring holes is 2.5 cm-3.5 cm.

[0013] Optionally, the bending angle between the scooping section and the other end of the anchoring section does not exceed 50 degrees.

[0014] Optionally, a plurality of ears are circumferentially arranged on the outer side of one end of the inner tube away from the drill tube head, and a plurality of buckles are circumferentially arranged on the outer side of one end of the drill tube away from the drill tube head, and the positions of the plurality of buckles correspond one-to-one to the positions of the plurality of ears, and the buckles cooperate with the ears to fix the inner tube in the drill tube.

[0015] Optionally, the outer diameter of the inner tube is equal to the inner diameter of the drill tube, and the outer wall of the inner tube fits with the inner wall of the drill tube.

[0016] The beneficial effect of the utility model is that the scooping sections of multiple steel strands with certain elastic properties and sufficient rigidity cooperate with each other, so that the broken rock blocks can be smoothly squeezed into the inner tube by the scooping sections being stretched open by the elastic properties of the steel strands, and the rigidity of the steel strands allows the scooping sections to return to their original angles, thereby preventing the broken rock blocks squeezed into the inner tube from falling, thereby achieving the purpose of scooping and collecting waste rock and broken rock blocks in the borehole and clearing obstacles in the borehole.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural disassembly diagram of a rotary drilling rig bit for scooping out waste rock and broken rock blocks shown in one embodiment of the utility model;

[0019] Figure 2 It is a schematic top view of the inner barrel of a rotary drilling barrel drill bit for scooping out waste rock and broken rock blocks shown in one embodiment of the utility model;

[0020] Figure 3 This is a diagram showing the drilling process of a rotary drilling barrel drill bit for scooping up waste rock and broken rock blocks, as shown in one embodiment of the utility model, in which rock blocks begin to squeeze into the inner barrel;

[0021] Figure 4 This is a diagram showing the drilling process of a rotary drilling barrel drill bit for scooping up waste rock and broken rock blocks after the rock blocks are squeezed into the inner barrel as shown in one embodiment of the utility model;

[0022] In the figure: 1. drill tube; 11. buckle; 2. inner tube; 21. hanging ear; 3. fixing steel ring; 31. anchor hole; 4. steel strand; 41. anchor section; 42. fishing section. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] See also Figure 1 and Figure 2A rotary drilling barrel drill bit for scooping up waste rock and broken rock blocks as shown in a preferred embodiment of the present application comprises a drill barrel 1, an inner barrel 2, two fixed steel rings 3 and a plurality of steel strands 4. The inner barrel 2 is detachably arranged in the drill barrel 1. The two fixed steel rings 3 are arranged in the inner barrel 2 and are respectively arranged at the two ends of the inner barrel 2. The steel strand 4 is divided into an anchoring section 41 and a scooping section 42 connected to the anchoring section 41. One end of the anchoring section 41 is anchored on one of the fixed steel rings 3, and the other end of the anchoring section 41 is anchored on another fixed steel ring 3 close to the head of the drill barrel 1. The other ends of the scooping section 42 and the anchoring section 41 are bent at an acute angle and extend obliquely toward the central axis direction of the inner barrel 2. A plurality of steel strands 4 are distributed at intervals along the circumference of the fixed steel ring 3.

[0027] Because conventional rotary drilling barrel drills cannot form complete rock blocks after breaking the rock when encountering uneven rock formations and high rock formation strength, the rock blocks cannot be stuck in the drill barrel 1 through the friction between the drilled rock and the inner wall of the barrel and will not fall off. Instead, they will break into several parts and fall back into the hole to cause obstruction in the drilling hole.

[0028] Therefore, according to the solution of the embodiment of the utility model, see Figure 3 and Figure 4 , through the cooperation of the scooping sections 42 of multiple steel strands 4 with certain elastic properties and sufficient rigidity, the broken rock can be pushed into the inner tube 2 smoothly due to the elastic properties of the steel strands 4, and the scooping sections 42 are restored to the original angle due to the rigidity of the steel strands 4, thereby preventing the broken rock squeezed into the inner tube 2 from falling, so as to achieve the purpose of scooping and collecting waste rocks and broken rocks in the borehole and clearing obstacles in the borehole. Two fixed steel rings 3 are respectively arranged at both ends of the inner tube 2, which can provide anchoring positions for the steel strands 4 while strengthening the overall rigidity of the inner tube 2, so as to avoid the steel strands 4 being directly anchored at both ends of the inner tube 2, resulting in the steel strands 4 anchoring positions being exposed, and the friction between the rock blocks and the inner tube 2 when the rock blocks enter the inner tube 2, resulting in the steel strands 4 being damaged and falling off.

[0029] The following is a detailed description with specific embodiments:

[0030] See also Figure 1 and Figure 2 The fixed steel ring 3 is provided with a plurality of anchor holes 31 spaced apart along the circumferential direction, and the plurality of anchor holes 31 correspond to the positions of the plurality of steel strands 4 one by one, and the two ends of the anchor sections 41 of the steel strands 4 are respectively anchored in the corresponding anchor holes 31. The central axis of the anchor hole 31 and the central axis of the anchor section 41 are parallel to the central axis of the inner tube 2, and the spacing between two adjacent anchor holes 31 is 2.5 cm-3.5 cm.

[0031] Specifically, in this embodiment, the inner tube 2 is a steel tube structure, the fixed steel rings 3 at both ends of the inner tube 2 are connected to the inner tube 2 by welding, and the spacing between two adjacent anchor holes 31 on the same fixed steel ring 3 is 3 cm. The length of the scooping section 42 of the steel strand 4 is one quarter of the overall length of the steel strand 4.

[0032] The bending angle between the scooping section 42 and the other end of the anchoring section 41 does not exceed 50 degrees. It should be noted that the steel strand 4 needs to have certain elastic properties and sufficient rigidity, so that when the drill tube 1 goes down and the rock blocks are squeezed upward, the angle between the scooping section 42 and the anchoring section 41 becomes smaller, and the central gap surrounded by multiple scooping sections 42 becomes larger to allow the rock blocks to squeeze upward into the inner tube 2. Afterwards, the scooping section 42, due to its own rigidity and without the external force of the rock blocks, automatically returns to its initial position, thereby clamping the rock blocks squeezed into the inner tube 2 and preventing them from falling. However, if the bending angle between the scooping section 42 and the other end of the anchoring section 41 is too large, the scooping section 42 needs to be bent at a larger angle when the rock blocks enter the inner tube 2, that is, the force exerted by the rock blocks on the scooping section 42 also needs to be greater, which easily leads to the rock blocks being unable to squeeze into the inner tube 2.

[0033] The outer side of the end of the inner tube 2 away from the head of the drill tube 1 is provided with a plurality of hanging ears 21 along the circumferential direction, and the outer side of the end of the drill tube 1 away from the head of the drill tube 1 is provided with a plurality of buckles 11 along the circumferential direction. The positions of the plurality of buckles 11 correspond to the plurality of hanging ears 21 one by one, and the buckles 11 cooperate with the hanging ears 21 to fix the inner tube 2 in the drill tube 1. The fixing method of the hanging ears 21 and the buckles 11 is double-sided full welding. When the drill bit is working, the inner tube 2 is first placed in the drill tube 1, and the hanging ears 21 fixed on the inner tube 2 cooperate with the buckles 11 on the drill tube 1 to fix the inner tube 2 in the drill tube 1, so as to prevent the inner tube 2 from slipping out of the drill tube 1 during operation.

[0034] The outer diameter of the inner tube 2 is equal to the inner diameter of the drill tube 1, and the outer wall of the inner tube 2 fits the inner wall of the drill tube 1, so that the inner tube 2 can be smoothly inserted into the drill tube 1 while preventing the gap between the inner tube 2 and the drill tube 1 from affecting the drilling process.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A rotary drilling rig for scooping up waste rock and broken rock blocks, characterized in that: include: Drill barrel; An inner cylinder, detachably disposed in the drill cylinder; Two fixed steel rings are arranged in the inner cylinder and at two ends of the inner cylinder respectively. A plurality of steel strands are divided into an anchoring section and a scooping section connected to the anchoring section, one end of the anchoring section is anchored on one of the fixed steel rings, and the other end of the anchoring section is anchored on another of the fixed steel rings close to the drill pipe head, the scooping section and the other end of the anchoring section are bent at an acute angle and extend obliquely toward the central axis of the inner tube, and the plurality of steel strands are distributed at intervals along the circumference of the fixed steel ring.

2. The rotary drilling rig bit for scooping up waste rock and broken rock blocks according to claim 1 is characterized in that: The fixed steel ring is provided with a plurality of anchor holes spaced apart along the circumferential direction, the plurality of anchor holes correspond to the positions of the plurality of steel strands one by one, and the two ends of the anchoring section of the steel strand are respectively anchored in the corresponding anchor holes.

3. The rotary drilling auger bit for scooping up waste rock and broken rock blocks according to claim 2 is characterized in that: The central axis of the anchoring hole and the central axis of the anchoring section are parallel to the central axis of the inner tube.

4. The rotary drilling auger bit for scooping up waste rock and broken rock blocks according to claim 3 is characterized in that: The distance between two adjacent anchor holes is 2.5 cm to 3.5 cm.

5. The rotary drilling auger bit for scooping up waste rock and broken rock blocks according to claim 4 is characterized in that: The bending angle between the scooping section and the other end of the anchoring section does not exceed 50 degrees.

6. The rotary drilling rig bit for scooping up waste rock and broken rock blocks according to claim 1, characterized in that: A plurality of hanging ears are circumferentially arranged on the outer side of one end of the inner tube away from the drill tube head, and a plurality of buckles are circumferentially arranged on the outer side of one end of the drill tube away from the drill tube head, and the positions of the plurality of buckles correspond one to one with the positions of the plurality of hanging ears, and the buckles cooperate with the hanging ears to fix the inner tube in the drill tube.

7. The rotary drilling auger bit for scooping up waste rock and broken rock blocks according to claim 1, characterized in that: The outer diameter of the inner tube is equal to the inner diameter of the drill tube, and the outer wall of the inner tube fits the inner wall of the drill tube.

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