Drill bit of pile driver

Abstract

The utility model discloses a pile driver drill bit which comprises a drill body, a three-jaw portion is arranged on the top of the drill body, and roller bits are arranged on jaws of the three-jaw portion. The drill body is provided with a plurality of connecting protruding blocks located below the three-jaw part. The connecting convex block is connected with a blade, and a connecting groove is formed in the inner side of the blade; a threaded hole is formed in the connecting groove; a connecting counter bore is formed in the connecting convex block, and the connecting counter bore corresponds to the threaded hole; a plurality of main grinding teeth are arranged on the blades, and a plurality of first auxiliary grinding teeth are arranged on the inner sides of the main grinding teeth; and a plurality of second auxiliary grinding teeth are arranged below the main grinding teeth. In the operation process, the high-wear-resistance wear-resistant roller has the advantages of being small in resistance, high in wear resistance and long in service life.

Description

Technical Field

[0001] The utility model relates to a pile driver bit, belonging to the technical field of pile drivers. Background Art

[0002] A pile driver comprises two parts: a pile frame and a drilling system. The pile frame adopts a hydraulic walking type or crawler chassis with high automation degree; the drilling system includes a power head and a drill tool, and the output shaft of the power head and the auger drill tool are hollow. The power head generally adopts a three-ring reduction mechanism, which is a quite mature product. During operation, two motors drive the high-speed rotation of the reducer through a coupling, and the low-speed shaft of the power drives the drill pipe and the bit to rotate through a flange. Currently, the pile driver bits are generally relatively simple, usually adopting a single bit with a cylindrical structure, and achieving the purpose of pile driving by the downward impact force of the bit. For example, the Chinese utility model patent with the authorization publication number of CN204663393U discloses a three-point bit for a CFG pile driver, and specifically discloses that it includes a bit body and a flange connecting piece. The bit body is arranged at the upper end of the flange connecting piece. Three drill tips are arranged on the bit body, which are drill tip one, drill tip two, and drill tip three from left to right in sequence. The height of drill tip one is lower than that of drill tip three, and the height of drill tip three is lower than that of drill tip two. Fixed ears for fixedly connecting with the flange connecting piece are correspondingly arranged on both sides of the bit body. The top of the bit in this scheme is pointed, and the bit body is flat shovel type. This kind of bit has relatively large defects, mainly reflected in: it uses the flat shovel type bit body to cut the soil. During its operation, the wear resistance is not high. Especially when it needs to penetrate a gravel soil layer with larger particle sizes, the pointed top of the bit is prone to deformation and damage. Therefore, the bit needs to be frequently replaced, which affects the construction efficiency and increases the cost at the same time. Content of the Utility Model

[0003] The purpose of the utility model is to provide a pile driver bit, which has the characteristics of small resistance, high wear resistance and long service life during operation.

[0004] The technical solution of the utility model: a pile driver bit, including a drill body, the top of the drill body has a three-claw part, and roller bits are arranged on the claws of the three-claw part; a plurality of connecting bumps are arranged on the drill body below the three-claw part, and the connecting bumps are L-shaped; the connecting bumps are connected with knife wings, a connecting groove is arranged inside the knife wings, and the connecting groove is matched with the connecting bumps; a threaded hole is arranged in the connecting groove; a connecting counterbore is arranged on the connecting bumps, and the connecting counterbore corresponds to the threaded hole; a plurality of main grinding teeth are arranged on the knife wings, and a plurality of first secondary grinding teeth are arranged inside the main grinding teeth; a plurality of second secondary grinding teeth are arranged below the main grinding teeth.

[0005] The above-mentioned pile driver bit, the roller bit includes a bit body, and the bit body is conical; the first row of teeth, the second row of teeth and the third row of teeth are distributed circumferentially from the outside to the inside of the bit body; a taper tooth is provided at the conical top of the bit body; an annular groove is provided between the second row of teeth and the third row of teeth.

[0006] For the aforementioned pile driver bit, the roller bits are evenly distributed at 120°; the inclination angle of the roller bit is 60°.

[0007] For the aforementioned pile driver bit, water spray nozzles are provided between the claws of the three-claw part; a water inlet is provided at the rear end of the drill body, and the water inlet is communicated with the water spray nozzles.

[0008] For the aforementioned pile driver bit, a connecting platform is provided at the rear end of the drill body, and a thread is provided on the connecting platform.

[0009] For the aforementioned pile driver bit, the number of the main grinding teeth, the first auxiliary grinding teeth and the second auxiliary grinding teeth is 2 to 5.

[0010] For the aforementioned pile driver bit, the connecting convex block is located below the gap between the claws of the three-claw part; the cutter wing is spiral.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. In the utility model, when facing a relatively soft rock layer, the pile driving operation can be directly carried out on the ground through the roller bit on the three-claw part; when facing a relatively hard rock layer or when it is necessary to enlarge the diameter of the pile hole, select a suitable cutter wing, fit the connecting groove of the cutter wing with the connecting convex block, and then pass the bolt through the connecting counterbore to the connecting hole and tighten it to connect and fix the cutter wing with the drill body; during the pile driving process, the roller bit quickly impacts the rock, greatly reducing the strength of the rock, and then the cutter wing and the main grinding teeth, the first auxiliary grinding teeth and the second auxiliary grinding teeth on the cutter wing perform secondary scraping and crushing on the pile hole wall, improving the pile driving efficiency, accelerating the construction progress, and reducing the wear of the roller bit.

[0013] 2. In the utility model, the roller bit rotates through the bit body so that the first row of teeth, the second row of teeth and the third row of teeth alternately contact the rock layer and impact the rock layer; when the rock layer is relatively hard, the taper tooth can continuously impact the rock layer and finally break it. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural view of the utility model;

[0015] Figure 2 is a schematic bottom structural view of the utility model;

[0016] Figure 3It is a schematic cross-sectional structure diagram of the present utility model.

[0017] The reference signs in the drawings are: 1 - drill body, 2 - three-jaw part, 3 - roller bit, 4 - connecting convex block, 5 - cutter wing, 6 - connecting groove, 7 - threaded hole, 8 - connecting counterbore, 9 - main grinding tooth, 10 - first secondary grinding tooth, 11 - second secondary grinding tooth, 12 - water spray head, 13 - water inlet, 14 - connecting platform, 15 - thread, 31 - drill bit body, 32 - first round tooth, 33 - second round tooth, 34 - third round tooth, 35 - taper tooth, 36 - annular groove. Specific embodiments

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present utility model.

[0019] Embodiment: A pile driver drill bit, the structure of which is as Figures 1 - 3 shown, including a drill body 1, the top of the drill body 1 is provided with a three-jaw part 2, and roller bits 3 are provided on the claws of the three-jaw part 2; as Figure 3 shown, a plurality of connecting convex blocks 4 are provided on the drill body 1 below the claw gaps of the three-jaw part 2, and the connecting convex blocks 4 are L-shaped; the connecting convex blocks 4 are connected with cutter wings 5, the cutter wings 5 are spiral, a connecting groove 6 is provided inside the cutter wings 5, and the connecting groove 6 is matched with the connecting convex blocks 4; a threaded hole 7 is provided in the connecting groove 6; a connecting counterbore 8 is provided on the connecting convex blocks 4, and the connecting counterbore 8 corresponds to the threaded hole 7; a plurality of main grinding teeth 9 are provided on the cutter wings 5, and a plurality of first secondary grinding teeth 10 are provided inside the main grinding teeth 9; a plurality of second secondary grinding teeth 11 are provided below the main grinding teeth 9. The roller bits 3 are evenly distributed at 120° intervals; the inclination angle of the roller bits 3 is 60°. Water spray heads 12 are provided between the claws of the three-jaw part 2; a water inlet 13 is provided at the rear end of the drill body 1, and the water inlet 13 is communicated with the water spray heads 12. During the piling process, by passing water into the drill rod of the pile driver, the water flows from the water inlet 13 to the water spray heads 12 and then sprays out from the water spray heads 12. On the one hand, it can cool the roller bits 3, cutter wings 5, main grinding teeth 9, first secondary grinding teeth 10 and second secondary grinding teeth 11, and on the other hand, it can discharge the broken rocks outwards along with the water overflowing from the pile hole, reducing the accumulation of stone debris in the pile hole. As Figure 2 shown, a connecting platform 14 is provided at the rear end of the drill body 1, and a thread 15 is provided on the connecting platform 14. By screwing the thread 15 on the connecting platform 14 into the bottom of the drill rod of the external pile driver, the connection and fixation of the drill body 1 and the drill rod are realized. The number of the main grinding teeth 9, first secondary grinding teeth 10 and second secondary grinding teeth 11 is 2 - 5. In this embodiment, the number of the main grinding teeth 9, first secondary grinding teeth 10 and second secondary grinding teeth 11 is 3. The main grinding teeth 9, first secondary grinding teeth 10 and second secondary grinding teeth 11 are all made of a composite material of tungsten carbide and diamond.

[0020] Preferably, as Figure 1 shown, the roller bit 3 includes a bit body 31, and the bit body 31 is conical; the first row of teeth 32, the second row of teeth 33 and the third row of teeth 34 are distributed circumferentially from outside to inside on the bit body 31; a cone tooth 35 is provided at the conical top of the bit body 31. During the piling process, since the drill body 1 is connected to the drill pipe of the CFG pile rig, the rotational movement of the drill pipe applies compressive stress to the formation rock through the drill body 1 and the roller bit 3. When the drill body 1 rotates, due to the reaction force of the formation rock, the roller bit 3 will rotate self - sufficiently. The first row of teeth 32, the second row of teeth 33 and the third row of teeth 34 alternately contact and cut into the rock, impact the rock layer, break and shear the rock layer, generating debris; when the rock layer is relatively hard, the cone tooth 35 can continuously impact the rock layer and finally break it.

[0021] Working principle:

[0022] During the piling process, when facing a relatively soft rock layer, the roller bit 3 on the three - jaw part 2 can be directly used to pile the ground; when facing a relatively hard rock layer or when it is necessary to expand the diameter of the pile hole, select a suitable cutter wing 5, match the connecting groove 6 of the cutter wing 5 with the connecting convex block 4, and then pass a bolt through the connecting counter - bore 8 into the connecting hole and tighten it to connect and fix the cutter wing 5 to the drill body 1. During the piling process, the roller bit 3 quickly impacts the rock, greatly reducing the strength of the rock. Then, the cutter wing 5 and the main grinding teeth 9, the first secondary grinding teeth 10 and the second secondary grinding teeth 11 on the cutter wing 5 perform secondary scraping and breaking on the pile hole wall, improving the piling efficiency, accelerating the construction progress, and reducing the wear of the roller bit 3. If the cutter wing 5, the main grinding teeth 9, the first secondary grinding teeth 10 and the second secondary grinding teeth 11 are worn to a large extent, the cutter wing 5 can be removed and replaced.

Claims

1. A pile driver drill bit, comprising a drill body (1), the top of the drill body (1) having three claws (2), the claws of the three claws (2) each being provided with a roller drill bit (3); characterized in that: The drill body (1) is provided with a plurality of connecting protrusions (4) located below the three-claw portion (2), and the connecting protrusions (4) are L-shaped; the connecting protrusions (4) are connected to a blade wing (5), and a connecting groove (6) is provided inside the blade wing (5), and the connecting groove (6) matches the connecting protrusion (4); a threaded hole (7) is provided inside the connecting groove (6); a connecting countersunk hole (8) is provided on the connecting protrusion (4), and the connecting countersunk hole (8) corresponds to the threaded hole (7); the blade wing (5) is provided with a plurality of main grinding teeth (9), and a plurality of first auxiliary grinding teeth (10) are provided inside the main grinding teeth (9); and a plurality of second auxiliary grinding teeth (11) are provided below the main grinding teeth (9).

2. The pile driver drill bit according to claim 1, characterized in that: The roller drill bit (3) comprises a drill bit body (31) which is conical; a first gear tooth (32), a second gear tooth (33) and a third gear tooth (34) are distributed on the drill bit body (31) from the outside to the inside; a conical top end of the drill bit body (31) is provided with a conical tooth (35); and an annular groove (36) is provided between the second gear tooth (33) and the third gear tooth (34).

3. The pile driver drill bit according to claim 1, characterized in that: The roller drill bits (3) are evenly spaced at an angle of 120°; the inclination angle of the roller drill bits (3) is 60°.

4. The pile driver drill bit according to claim 1, characterized in that: A water outlet nozzle (12) is provided between the claws of the three claw parts (2); a water inlet (13) is provided at the rear end of the drill body (1), and the water inlet (13) is connected to the water outlet nozzle (12).

5. The pile driver drill bit according to claim 1, characterized in that: The rear end of the drill body (1) is provided with a connecting platform (14), and a thread (15) is provided on the connecting platform (14).

6. The pile driver drill bit according to claim 1, characterized in that: The number of the main grinding teeth (9), the first auxiliary grinding teeth (10) and the second auxiliary grinding teeth (11) is 2 to 5.

7. The pile driver drill bit according to claim 1, characterized in that: The connecting protrusion (4) is located below the gap between the claws of the three-claw portion (2); and the blade (5) is spiral-shaped.

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