Composite drill bit of rotary drilling rig

Abstract

The utility model discloses a rotary drilling rig composite drill bit which comprises a drill body, the upper surface of the drill body is fixedly connected with a plurality of installation seats, the upper surface of each installation seat is fixedly connected with a first drill bit body, the inner wall of the drill body is fixedly connected with an installation plate, and the upper surface of the installation plate is fixedly connected with a connecting column. Symmetrical connecting rods are fixedly connected to the outer surface of the connecting column, a set of sawteeth arranged at equal intervals are fixedly connected to the outer surface of each connecting rod, a set of second drill bit bodies arranged at equal intervals are fixedly connected to the outer surface of each connecting rod, and a fixing cylinder is fixedly connected to the bottom face of the mounting plate. A damper is fixedly connected to the inner top wall of the fixing cylinder, a damping spring is fixedly connected to the inner top wall of the fixing cylinder, and a damping plate is fixedly connected to the bottom end of the damper and the bottom end of the damping spring jointly. The utility model can overcome the difficulties that the conventional drill bit is easy to slip when meeting water in the mudstone stratum, the drilling speed is low and the like, improve the construction efficiency and reduce the construction cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil layer or rock drilling, and in particular relates to a composite drill bit for a rotary drilling rig. Background Art

[0002] The main bridge of Huoxianggou Bridge in the Qingyang transit section of G244 adopts a (98+180+180+98)-meter four-span, three-tower, double-cable-plane, low-tower cable-stayed bridge design. The foundation of the main pier No. 16 is a bored cast-in-place pile, which is a friction pile type. The pile diameter is 2.2 meters and the length is 93 meters. A total of 36 piles are set. The strata at this pier are mainly composed of Quaternary aeolian loess and paleosol, and below is the Cretaceous mudstone layer. The depth of the loess layer on the upper part of the pile body exceeds 60 meters, including silty clay and paleosol (silty clay) layers, which are prone to collapse. The depth of the lower mudstone layer is about 30 meters, and its natural uniaxial compressive strength can reach a maximum of 61.3MPa, and the saturated uniaxial compressive strength can reach a maximum of 51.5MPa. Due to the high strength of the mudstone layer, when using conventional rotary drill bits for drilling, the contact area between the drill bit and the pile surface is limited, and it is easy to slip and deviate when encountering water, resulting in drilling difficulties and low work efficiency.

[0003] In addition, the connection steps between the traditional rotary drilling bit and the drilling rig are relatively complicated and inconvenient to disassemble and install, which further affects the working efficiency of the drill bit and makes the time for drilling a single pile exceed 15 days. At the same time, the traditional drill bit is prone to breakage and loosening of bolts and nuts at the connection due to the influence of temperature increase and vibration after long-term operation, requiring secondary tightening, thereby reducing working efficiency. Summary of the invention

[0004] The utility model aims to provide a composite drill bit for a rotary drilling rig to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A composite drill bit for a rotary drilling rig comprises a drill body, wherein a plurality of mounting seats are fixedly connected to the upper surface of the drill body, a first drill body is fixedly connected to the upper surface of each mounting seat, a mounting plate is fixedly connected to the inner wall of the drill body, a connecting column is fixedly connected to the upper surface of the mounting plate, a symmetrical connecting rod is fixedly connected to the outer surface of the connecting column, a group of equidistantly arranged saw teeth are fixedly connected to the outer surface of each connecting rod, a group of equidistantly arranged second drill bodies are fixedly connected to the outer surface of each connecting rod, a fixing cylinder is fixedly connected to the bottom surface of the mounting plate, a damper is fixedly connected to the inner top wall of the fixing cylinder, a damping spring is fixedly connected to the inner top wall of the fixing cylinder, and the bottom end of the damper and the bottom end of the damping spring are fixedly connected to a damping plate.

[0007] In a further embodiment, a reinforcement rod is fixedly connected to the mutually adjacent side surfaces of the two mounting seats, and each of the reinforcement rods is made of stainless steel.

[0008] In a further embodiment, the outer surface of the drill body is provided with symmetrical water inlets, and the upper surface of the mounting plate is provided with a group of annularly arranged water outlet holes.

[0009] In a further embodiment, a slag discharge port is provided on the upper surface of the mounting plate and the upper surface of the drill body, and a fixing block is fixedly connected to the outer surface of the drill body.

[0010] In a further embodiment, a temperature sensor is fixedly connected to the outer surface of the drill body, and a protective shell is fixedly connected to the outer surface of the temperature sensor.

[0011] In a further embodiment, symmetrical wing plates are fixedly connected to the upper surface of the mounting plate, and the side surfaces of the two wing plates that are away from each other are fixedly connected to the inner wall of the drill body.

[0012] In a further embodiment, a fixing plate is fixedly connected to the inner wall of the drill body, and a group of annularly arranged threaded rods are fixedly connected to the bottom surface of the fixing plate.

[0013] In a further embodiment, a group of reinforcing rods arranged in an annular manner are fixedly connected to the inner wall of the drill body, and the top end of each reinforcing rod is fixedly connected to the bottom surface of the mounting plate.

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

[0015] The device greatly increases the number of drill teeth through the mutual cooperation of multiple mounting seats and multiple first drill body bodies, and has the advantage of high bite with the rock mass during the drilling process. Through the mutual cooperation of the mounting column, the connecting rod, the sawtooth and the second drill body, it can overcome the difficulties of conventional drill bits that are easy to slip when encountering water in mudstone formations and have slow drilling speeds, thereby improving construction efficiency, accelerating drilling speeds, and reducing construction costs. It shortens the time for single pile drilling from more than 15 days to less than 7 days. By setting up multiple threaded rods, it is easy to install and disassemble the drill body and the drilling rig. The steps are simple and convenient. Through the mutual cooperation of the reinforcing rod, the reinforcement rod and the wing-shaped plate, it can The structural strength of the drill body itself can be strengthened, thereby ensuring the safety of the drill body during rotary drilling. Through the cooperation of the water inlet and the water outlet, the drill body itself can be cooled by water flow during rotary drilling, ensuring the normal rotary drilling of the drill body. The cooperation of the shock absorber, the shock absorbing spring, the shock absorbing plate and the fixing tube can enable the drill bit to be quickly connected and positioned with the fuselage, and the shock absorbing effect of the shock absorber and the shock absorbing spring can reduce the wear between the fixing tube and the positioning rod. At the same time, it plays a buffering role during the operation of the drill bit, reduces the shaking of the drill bit, and avoids the situation where the connection between the drill bit and the fuselage becomes loose and needs to be tightened again. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a composite drill bit of a rotary drilling rig;

[0017] Figure 2 This is a schematic diagram of the structure of the bottom of a composite drill bit of a rotary drilling rig;

[0018] Figure 3 It is a structural schematic diagram of the top of a composite drill bit of a rotary drilling rig;

[0019] Figure 4 The present invention is a schematic diagram of the structure inside the drill body of a composite drill bit of a rotary drilling rig.

[0020] In the figure: 1. drill body; 2. mounting seat; 3. first drill bit body; 4. fixing block; 5. temperature sensor; 6. reinforcement rod; 7. slag discharge port; 8. water inlet; 9. fixing plate; 10. threaded rod; 11. reinforcement rod; 12. mounting plate; 13. connecting column; 14. connecting rod; 15. second drill bit body; 16. sawtooth; 17. water outlet; 18. wing plate; 19. fixing cylinder; 20. damper; 21. damping spring; 22. damping plate. DETAILED DESCRIPTION

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] 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.

[0024] See also Figure 1-4In the utility model, a composite drill bit for a rotary drilling rig comprises a drill body 1, a plurality of mounting seats 2 are fixedly connected to the upper surface of the drill body 1, a first drill body 3 is fixedly connected to the upper surface of each mounting seat 2, a mounting plate 12 is fixedly connected to the inner wall of the drill body 1, a connecting column 13 is fixedly connected to the upper surface of the mounting plate 12, a symmetrical connecting rod 14 is fixedly connected to the outer surface of the connecting column 13, a group of equidistantly arranged saw teeth 16 are fixedly connected to the outer surface of each connecting rod 14, and a group of equidistantly arranged second drill bodies 15 are fixedly connected to the outer surface of each connecting rod 14 The bottom surface of the mounting plate 12 is fixedly connected with a fixing cylinder 19, the inner top wall of the fixing cylinder 19 is fixedly connected with a damper 20, the inner top wall of the fixing cylinder 19 is fixedly connected with a damping spring 21, the bottom end of the damper 20 and the bottom end of the damping spring 21 are commonly fixedly connected with a damping plate 22. By arranging a plurality of mounting seats 2, a first drill body 3, a second drill body 15, a connecting rod 14 and saw teeth 16, the drill bit, compared with a conventional drill bit, solves the difficulties of easy slipping of the drill bit and slow drilling speed in the mudstone layer of an ultra-long pile foundation, improves construction efficiency, speeds up drilling speed and reduces construction cost.

[0025] A reinforcing rod 6 is fixedly connected to one side of the two mounting seats 2 close to each other. Each reinforcing rod 6 is made of stainless steel, which strengthens the firmness of the mounting seat 2 and enhances the stability of the first drill bit body 3 during the drilling process. A symmetrical water inlet 8 is provided on the outer surface of the drill body 1, and a group of annularly arranged water outlet holes 17 are provided on the upper surface of the mounting plate 12, which can facilitate the injection of water into the interior of the drill body 1, thereby achieving the effect of cooling the drill body 1 and improving the working efficiency of the device. A slag discharge port 7 is provided on the upper surface of the mounting plate 12 and the upper surface of the drill body 1, which is convenient for discharging the debris generated during the drilling process. A fixing block 4 is fixedly connected to the outer surface of the drill body 1. The fixing block 4 is arranged at the joint or component installation of the drill body 1 to facilitate strengthening the structural strength of the device. A temperature sensor 5 is fixedly connected to the outer surface of the drill body 1. The temperature sensor 5 can be arranged in the slot body. The outer surface of the temperature sensor 5 is fixedly connected to a protective shell, which is convenient for understanding the temperature of the device during operation and for timely cooling it.

[0026] Symmetrical wing plates 18 are fixedly connected to the upper surface of the mounting plate 12, and the side surfaces of the two wing plates 18 that are away from each other are fixedly connected to the inner wall of the drill body 1, thereby enhancing the structural strength of the drill body 1 and ensuring the normal use of the device. A fixing plate 9 is fixedly connected to the inner wall of the drill body 1, and a group of annularly arranged threaded rods 10 are fixedly connected to the bottom surface of the fixing plate 9, which facilitates the connection between the drill body 1 and the drilling rig, and the steps are simple and convenient. A group of annularly arranged reinforcing rods 11 are fixedly connected to the inner wall of the drill body 1, and the top end of each reinforcing rod 11 is fixedly connected to the bottom surface of the mounting plate 12, thereby enhancing the firmness of the mounting plate 12 and extending the service life of the device.

[0027] The working principle of the utility model is:

[0028] When the device is in use, firstly, the positioning rod of the machine body is combined with the fixing cylinder 19 inside the drill body 1, and the damper 20 and the damping spring 21 are used to form a shock-absorbing and buffering effect when the positioning rod contacts the damping plate 22, and the elasticity of the damping spring 21 is used to reset the damping plate 22, and then the threaded rod 10 is used to connect the drill body 1 with the drilling rig, and then the first drill bit body 3 of the drill body 1 is used to contact the surface of the pile body by the drilling rig, and the saw teeth 16 are used to contact the surface of the pile body, so as to strengthen the friction between the drill body 1 and the pile body, and then, the drill body 1 is driven to rotate by the drilling rig, so that the drill body 1 drives the first drill bit body 3 and the second drill bit body 15 to rotate through the mounting seat 2, so as to achieve the effect of drilling the pile body, and finally, the residue generated by the drilling is discharged by the slag discharge port 7, so as to complete the drilling work. At the same time, compared with the conventional drill bit, the drill bit solves the problems of easy slipping of the drill bit and slow drilling speed in the mudstone layer of the super-long pile foundation, improves the construction efficiency, speeds up the drilling speed, and reduces the construction cost.

Claims

1. A composite drill bit for a rotary drilling rig, characterized in that: The drill body (1) comprises a drill body (1), the upper surface of the drill body (1) is fixedly connected to a plurality of mounting seats (2), the upper surface of each mounting seat (2) is fixedly connected to a first drill body (3), the inner wall of the drill body (1) is fixedly connected to a mounting plate (12), the upper surface of the mounting plate (12) is fixedly connected to a connecting column (13), the outer surface of the connecting column (13) is fixedly connected to a symmetrical connecting rod (14), and the outer surface of each connecting rod (14) is fixedly connected to a group of equidistant The outer surface of each connecting rod (14) is fixedly connected to a group of second drill body (15) arranged at equal distances, the bottom surface of the mounting plate (12) is fixedly connected to a fixing cylinder (19), the inner top wall of the fixing cylinder (19) is fixedly connected to a damper (20), the inner top wall of the fixing cylinder (19) is fixedly connected to a damping spring (21), and the bottom end of the damper (20) and the bottom end of the damping spring (21) are fixedly connected to a damping plate (22).

2. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A reinforcing rod (6) is fixedly connected to the mutually adjacent side surfaces of the two mounting seats (2), and each of the reinforcing rods (6) is made of stainless steel.

3. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: The outer surface of the drill body (1) is provided with symmetrical water inlets (8), and the upper surface of the mounting plate (12) is provided with a group of annularly arranged water outlet holes (17).

4. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: The upper surface of the mounting plate (12) and the upper surface of the drill body (1) are both provided with slag discharge openings (7), and the outer surface of the drill body (1) is fixedly connected to a fixing block (4).

5. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A temperature sensor (5) is fixedly connected to the outer surface of the drill body (1), and a protective shell is fixedly connected to the outer surface of the temperature sensor (5).

6. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: Symmetrical wing plates (18) are fixedly connected to the upper surface of the mounting plate (12), and the side surfaces of the two wing plates (18) that are away from each other are fixedly connected to the inner wall of the drill body (1).

7. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A fixing plate (9) is fixedly connected to the inner wall of the drill body (1), and a group of annularly arranged threaded rods (10) are fixedly connected to the bottom surface of the fixing plate (9).

8. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A group of reinforcing rods (11) arranged in an annular pattern are fixedly connected to the inner wall of the drill body (1), and the top end of each reinforcing rod (11) is fixedly connected to the bottom surface of the mounting plate (12).

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