Scraper bit of drilling machine for drilling construction of stratum pile foundation

Abstract

The utility model discloses a scraper bit of a drilling machine for drilling construction of a stratum pile foundation, which comprises a connecting unit and a drilling unit, the connecting unit comprises a bit body and a T-shaped disc fixedly connected to the top of the bit body, the top of the T-shaped disc is fixedly connected with a connecting disc through a bolt, and the top of the connecting disc is fixedly connected with a drilling rod and a drilling unit; the drill bit comprises a fixing column fixedly connected to the top of a drill bit body, the bottom of the side wall of the fixing column is fixedly connected with a plurality of blades in an annular array, the top of each blade is fixedly connected to the bottom of the drill bit body, and the two sides of each blade are bent in an arc shape. According to the utility model, through the obliquely arranged blades, the impact force of a sediment mixture can be dispersed, and the sediment mixture can be rolled up by the blades and extruded to the top of the drill bit body through the discharge holes, so that the sediment mixture accumulated around the blades is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to scraper drill bit technical field especially relates to a scraper drill bit of drill rig for stratum pile foundation drilling construction. BACKGROUND

[0002] The scraper drill bit is the earliest drill bit used in rotary drilling, the scraper drill bit is simple in structure, a lateral working blade is welded on the oval cylindrical shell with internal threads, a thin flaky hard alloy cutting tool is welded on the blade, and the cutting tool is used for drilling, under the action of drilling pressure and torque, the blade breaks rocks through cutting, shearing and scraping, and when plastic brittle rocks are drilled, the comb teeth formed by the hard points such as hard alloy or diamond continuously worn out in the blade break rocks.

[0003] The existing blade is usually vertically and annularly arranged on the outer wall of the drill bit, during the rotation of the drill bit, the excavated soil and gravel mixture is accumulated on the side of the blade, the soil and gravel mixture hits the blade and makes the drill bit shake and deviate, which not only easily causes the blade to be worn out, but also affects the rotation stability of the drill bit, and when a large amount of soil and sand mixture is relatively viscous, the soil and sand mixture causes the drill rig to rotate difficultly, and thus the torque load of the drill rig is increased, therefore, the scraper drill bit of the drill rig for stratum pile foundation drilling construction is provided. SUMMARY

[0004] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems of the existing scraper drill bit of the drill rig for stratum pile foundation drilling construction, the utility model is provided.

[0006] Therefore, the utility model aims to provide a scraper drill bit of the drill rig for stratum pile foundation drilling construction, which is suitable for solving the problem that the excavated soil and gravel mixture is accumulated on the side of the blade, which not only easily causes the blade to be worn out, but also increases the torque load of the drill rig.

[0007] To solve the above technical problems, the utility model provides the following technical scheme: a scraper drill bit of the drill rig for stratum pile foundation drilling construction, comprising:

[0008] The connecting unit comprises a drill bit body and a T-shaped disc fixedly connected to the top of the drill bit body, the top of the T-shaped disc is fixedly connected with a connecting disc through bolts, and the top of the connecting disc is fixedly connected with a drill rod;

[0009] The drilling unit comprises a fixed column fixedly connected at the top of the drill bit body, a plurality of blades in annular array are fixedly connected at the bottom of the sidewall of the fixed column, the top of each blade is fixedly connected at the bottom of the drill bit body, the two sides of each blade are curved in arc shape, and each blade is arranged in an inclined manner, and a plurality of discharge holes in annular array are formed at the top of the drill bit body.

[0010] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, the bottom end of each discharge hole is located at one side of the top of the corresponding blade, and the aperture of the discharge hole decreases from top to bottom.

[0011] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, the sidewall of the bottom of each blade is fixedly connected with a plurality of cutting teeth, the cutting teeth on each blade are arranged in equidistant distribution, and the cutting teeth of adjacent two blades are arranged in rotational staggered distribution.

[0012] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, the top of the drill bit body is fixedly connected with a plurality of reinforcing plates arranged in annular array, one side and the top of each reinforcing plate are fixedly connected with the T-shaped disc, and each reinforcing plate is arranged in an inclined manner.

[0013] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, one side of each blade is fixedly connected with a pair of triangular blocks, and the top of each triangular block is fixedly connected at the bottom of the drill bit body.

[0014] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, the bottom of the fixed column is fixedly connected with a cutting head, and the bottom of the cutting head is fixedly connected with a plurality of uniformly distributed semicircular balls.

[0015] As a preferred scheme of the drag bit of the drilling machine for stratum pile foundation drilling construction, the top and the bottom of the sidewall of the drill bit body are respectively provided with a first chamfer and a second chamfer at the edges, and the slope of the first chamfer is larger than that of the second chamfer.

[0016] The beneficial effects of the present application are as follows: the blades arranged in an inclined manner can avoid direct impact of the mud and sand on the side surface of the blades, the blades arranged in an arc shape can disperse the impact force of the mud and sand mixture, and the mud and sand mixture can be rolled up by the blades and extruded to the top of the drill bit body through the discharge holes, so that the accumulation of the mud and sand mixture around the blades is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the premise of not deviating from the technical concept of the present application. Among them:

[0018] Fig. 1 The overall structure diagram of the scraper bit of the drilling machine for stratum pile foundation drilling construction is provided for the present application.

[0019] Fig. 2 The distribution diagram of the blade wing and the tooth is provided for the present application.

[0020] Fig. 3 The shape diagram of the discharge hole is provided for the present application.

[0021] 100, connecting unit; 101, bit body; 102, T-shaped disc; 103, connecting disc; 104, drill rod; 105, first chamfer; 106, second chamfer; 200, drilling unit; 201, fixed column; 202, blade wing; 203, discharge hole; 204, tooth; 205, reinforcing plate; 206, triangular block; 207, cutting head; 208, semicircle ball. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from the description, and those skilled in the art can make similar generalizations without deviating from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0024] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive with other embodiments.

[0025] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in order to facilitate the description, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual manufacturing.

[0026] Embodiment

[0027] With reference to Figs. 1-3 For an embodiment of the utility model, provide a kind of scraper drill bit of drill rig for stratum pile foundation drilling construction, it include: connecting unit 100 and drilling unit 200;

[0028] Wherein, connecting unit 100 includes drill bit body 101 and the T-shaped disc 102 fixedly connected at the top of drill bit body 101, the top of T-shaped disc 102 is fixedly connected with connecting disc 103 by bolt, and the top of connecting disc 103 is fixedly connected with drill rod 104;

[0029] Drilling unit 200 includes fixedly connected in the top of drill bit body 101 fixed column 201, and the bottom of the side wall of fixed column 201 is fixedly connected with multiple wings 202 of ring array, and the top of each wing 202 is fixedly connected in the bottom of drill bit body 101, and the two sides of each wing 202 are curved, and each wing 202 is inclinedly arranged, and the top of drill bit body 101 is provided with multiple discharge holes 203 of ring array.

[0030] T-shaped disc 102 is used to be fixedly installed with connecting disc 103, so that drill rod 104 can drive drill bit body 101 to rotate, the bottom of drill bit body 101 is provided with four equidistantly distributed wings 202, and the arc surface of wing 202 has a certain slope, in the process of rotation, wing 202 can produce more favorable cutting force decomposition by inclination angle, converts a part of torque into downward and forward cutting force, so that wing 202 is more easily cut into the ground, improves drilling efficiency, is inclinedly arranged, so that the mixture of mud and sand is in contact with wing 202, to avoid the mixture of mud and sand directly impacting the side of wing 202, so that the impact force of the mixture of mud and sand on wing 202 can be reduced, to reduce the risk of damage of wing 202, the cutting force can be more evenly distributed by the arc surface of wing 202, and the reaction force of stratum on wing 202 can be dispersed along the arc surface, to avoid local stress concentration and reduce the wear of wing 202;

[0031] In the process of rotation of drill bit body 101, the mixture of mud and sand can be rolled up by wing 202, so that the mixture of mud and sand is extruded into discharge hole 203 from bottom to top along the arc surface of wing 202, and the mixture of mud and sand can be quickly discharged to the top of drill bit body 101 through discharge hole 203, to avoid the accumulated mixture of mud and sand to increase the load of drill rotation, and the mixture of mud and sand located at the top of drill bit body 101 can be pumped out by external helical blade or mud pump, to ensure that wing 202 can efficiently drill a hole.

[0032] Specifically, the bottom end of each discharge hole 203 is located at the side of the top of corresponding wing 202 respectively, and the hole diameter of discharge hole 203 decreases from top to bottom in turn.

[0033] The discharge hole 203 is close to the end of the top arc surface of the blade wing 202. When the blade wing 202 rolls up the sediment mixture, the sediment mixture is pressed to the top of the arc surface of the blade wing 202, so that the sediment mixture can be quickly pressed into the discharge hole 203. The sediment mixture continuously generated is continuously pressed upward, and the sediment mixture is discharged from the top of the discharge hole 203. The diameter of the discharge hole 203 decreases from top to bottom, so that the sediment mixture can quickly enter the discharge hole 203. The discharged sediment mixture is difficult to fall from the opening at the top of the discharge hole 203 to the bottom of the drill bit body 101.

[0034] In addition, the side wall at the bottom of each blade wing 202 is fixedly connected with a plurality of cutting teeth 204. The cutting teeth 204 on each blade wing 202 are arranged at equal intervals, and the cutting teeth 204 of adjacent two blade wings 202 are arranged in a rotating staggered manner.

[0035] The cutting teeth 204 are used to assist the blade wing 202 to crush rock blocks. In the process of rotation of the cutting teeth 204 on one side of a blade wing 202, there are uncut gaps between the cutting teeth 204 of the blade wing 202. The cutting teeth 204 of adjacent two blade wings 202 are arranged in a rotating staggered manner, so that the cutting teeth 204 of another blade wing 202 can cut the gaps left by the previous blade wing 202. Thus, the burden of cutting of each cutting tooth 204 can be reduced, and the cutting teeth 204 can cooperate with each other to quickly drill a hole.

[0036] Further, a plurality of reinforcing plates 205 arranged in a ring array are fixedly connected to the top of the drill bit body 101. One side and the top of each reinforcing plate 205 are fixedly connected with the T-shaped disc 102. Each reinforcing plate 205 is arranged in an inclined manner. One side of each blade wing 202 is fixedly connected with a pair of triangular blocks 206. The top of each triangular block 206 is fixedly connected to the bottom of the drill bit body 101.

[0037] The reinforcing plate 205 is used to reinforce the connection between the T-shaped disc 102 and the drill bit body 101, so as to reduce the torque burden borne by the T-shaped disc 102. When the sediment mixture is located at the top of the drill bit body 101, the sediment mixture will not directly impact the reinforcing plate 205 transversely through the inclined arrangement of the T-shaped disc 102, so that the impact force of the sediment mixture on the reinforcing plate 205 can be weakened, and the reinforcing effect of the reinforcing plate 205 can be ensured.

[0038] The arc surface of the blade wing 202 which is not in contact with the triangular block 206 is in contact with the sediment mixture. When the blade wing 202 rolls up the sediment mixture, a large amount of sediment mixture will gather at the top of the blade wing 202. The top of the blade wing 202 can be reinforced by the triangular block 206, so as to ensure the strength of the blade wing 202.

[0039] Further, the bottom of the fixed column 201 is fixedly connected with a cutting head 207, and the bottom of the cutting head 207 is fixedly connected with a plurality of uniformly distributed semicircular balls 208.

[0040] The lowest point of the cutting head 207 is lower than the lowest point of the blade 202, the cutting head 207 can first contact the underlying silt and rock, and the cutting head 207 can pre-crush the hard rock to reduce the burden of the blade 202, the plurality of semicircular balls 208 can reduce the initial contact area of the cutting head 207 with the stratum, increase the unit area pressure, and make it easier to cut into the stratum, so as to help the cutting head 207 quickly break through the surface resistance and improve the drilling efficiency.

[0041] In addition, the edges of the top and bottom of the sidewall of the drill bit body 101 are respectively provided with a first chamfer 105 and a second chamfer 106, and the slope of the first chamfer 105 is larger than that of the second chamfer 106.

[0042] The second chamfer 106 can make the edge of the bottom of the drill bit body 101 not directly abut against the hole wall during the descending process of the drill bit body 101, so that the drill bit body 101 can stably descend, the slope of the first chamfer 105 is larger than that of the second chamfer 106, the first chamfer 105 can guide the drill bit body 101, the slope of the first chamfer 105 is larger than that of the second chamfer 106 during the ascending process of the drill bit body 101, the second chamfer 106 can shape the hole wall to make it smoother, and the slope of the first chamfer 105 can reduce the friction between the drill bit body 101 and the hole wall, so that the drill bit body 101 can be more easily pulled out of the hole.

[0043] During use, the T-shaped disc 102 is used for fixedly installing the connecting disc 103, so that the drill rod 104 can drive the drill bit body 101 to rotate, during the rotating process, the blade 202 can decompose the downward cutting force, so that the blade 202 can more easily cut into the underground and improve the drilling efficiency, during the rotating process of the drill bit body 101, the blade 202 can roll up the silt mixture, so that the silt mixture is extruded into the discharge hole 203 from bottom to top along the arc surface of the blade 202;

[0044] The silt mixture can be quickly discharged to the top of the drill bit body 101 through the discharge hole 203, the silt mixture at the top of the drill bit body 101 can be extracted through the external spiral blade or the mud pump, so as to ensure that the blade 202 can efficiently drill a hole, the relief tooth 204 can assist the blade 202 to crush the rock fragments, and the cutting head 207 can pre-crush the hard rock to reduce the burden of the blade 202.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A drag bit for a drill rig used in drilling a pile foundation into the ground, characterized by, The utility model relates to a drilling device, including: Connecting unit (100) including drill bit body (101) and the T -shaped disc (102) of fixed connection in the top of drill bit body (101), the top of T -shaped disc (102) is fixedly connected with the connecting disc (103) through bolt, the top of connecting disc (103) is fixedly connected with drill rod (104); Drilling unit (200) including fixed column (201) of fixed connection in the top of drill bit body (101), the bottom of side wall of fixed column (201) is fixedly connected with multiple wing blades (202) of annular array, the top of each wing blade (202) is fixedly connected in the bottom of drill bit body (101), the both sides of each wing blade (202) are curved, each wing blade (202) is inclinedly arranged, the top of drill bit body (101) is provided with multiple discharge holes (203) of annular array.

2. The drag bit of claim 1, wherein: The bottom end of each discharge hole (203) is located at the one side of the top of corresponding wing blade (202) respectively, and the aperture of discharge hole (203) decreases gradually from top to bottom.

3. A drag bit for a borehole formation pile foundation drilling rig as claimed in claim 2, characterised in that: The side wall of the bottom of each wing blade (202) is fixedly connected with multiple cutting teeth (204), the cutting tooth (204) on each wing blade (202) is arranged at equal intervals, and the cutting teeth (204) of adjacent two wing blades (202) are rotationally staggered.

4. The drag bit of claim 1, wherein: The top of drill bit body (101) is fixedly connected with multiple reinforcing plates (205) of annular array distribution, one side and the top of each reinforcing plate (205) are fixedly connected with T -shaped disc (102), and each reinforcing plate (205) is arranged in an inclined manner.

5. The drag bit of claim 2, wherein: One side of each wing blade (202) is fixedly connected with a pair of triangular blocks (206), and the top of each triangular block (206) is fixedly connected to the bottom of drill bit body (101).

6. The drag bit of claim 1, wherein: The bottom of fixed column (201) is fixedly connected with cutting head (207), and the bottom of cutting head (207) is fixedly connected with multiple evenly distributed semicircular balls (208).

7. The drag bit of claim 5, wherein: First chamfer (105) and second chamfer (106) are respectively arranged at the edge of the side wall top and bottom of drill bit body (101), and the slope of first chamfer (105) is greater than the slope of first chamfer (105).

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