Double-bottom rotary excavating drill bit with unique structure

Abstract

The utility model discloses a double-bottom rotary excavating drill bit with a unique structure, and relates to the technical field of rotary excavating drilling tools. The double-bottom rotary excavating drill bit with the unique structure comprises a conical barrel and a top plate fixedly arranged at the top of the conical barrel, a connecting square box is fixedly arranged at the top of the top plate, a bottom plate is rotatably arranged at the bottom of the conical barrel, a control rod matched with the bottom plate is arranged in the conical barrel and penetrates through the top plate, and an outer bottom plate is arranged at the bottom of the bottom plate; a plurality of teeth are fixedly arranged at the bottom of the outer bottom plate, and a righting guide assembly with the diameter the same as that of the bottom of the conical barrel is detachably arranged on the outer wall of the top of the conical barrel; by arranging the detachable centralizing and guiding assembly, a conical-barrel drilling tool or a straight-barrel drilling tool can be selected for use according to different construction stratum conditions, meanwhile, the drill suction prevention function is achieved, the drilling efficiency is effectively improved, and the construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary drilling tool technical field, concretely to a double bottom rotary drilling head with unique structure. BACKGROUND

[0002] In the process of civil construction, rotary drilling rig is often used to drill and pile on the foundation, and the rotary drilling head is one of the most important parts of the rotary drilling rig, and its structural performance has an important influence on the working efficiency and quality of the rotary drilling rig. At present, the rotary drilling head suitable for soil geology is a double bottom rotary drilling head, which is mainly divided into straight cylinder drill head and conical cylinder drill head, and the bottom of the two different shapes of drill head is provided with a plurality of bottom plates, and a plurality of cutting teeth are arranged at the center and around the bottom plate, and the soil enters the cylinder through the gap of the bottom plate.

[0003] The traditional conical cylinder drill and straight cylinder drill have certain limitations in function; the conical cylinder drill has smaller drilling resistance in soft formation and is more convenient to unload the soil, but it is prone to problems such as hole deviation and shrinkage in hard formation, and has poor stability; the straight cylinder drill can play a good guiding role in hard formation and is stable in drilling, but it is prone to large drilling protection resistance in soft formation, and it is not easy to unload the soil, the efficiency is low, and the existing straight cylinder drill is prone to suction when lifting the drill in the pile hole with water and mud, which seriously affects the construction progress. Therefore, different types of drills need to be frequently replaced according to different construction stratum conditions, which reduces the construction efficiency; and different types of drills also need to be purchased at the same time, which increases the investment cost. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a double bottom rotary drilling head with unique structure, which can select conical cylinder drill or straight cylinder drill for use according to different construction stratum conditions by setting the detachable centralizing and guiding assembly, and has the function of preventing suction, effectively improves the drilling efficiency and reduces the construction cost.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a double bottom rotary drilling head with unique structure, which comprises a conical cylinder and a top plate fixedly arranged at the top of the conical cylinder, a connecting square box is fixedly arranged at the top of the top plate, a bottom plate is rotatably arranged at the bottom of the conical cylinder, a control rod matched with the bottom plate is arranged in the conical cylinder and penetrates the top plate, an outer bottom plate is arranged at the bottom of the bottom plate, a plurality of teeth are fixedly arranged at the bottom of the outer bottom plate, and a centralizing and guiding assembly with the same diameter as the bottom of the conical cylinder is detachably arranged on the top outer wall of the conical cylinder.

[0006] Preferably, the righting and guiding assembly comprises a plurality of through holes transversely formed on the outer wall of the conical cylinder and an annular sleeve arranged outside the conical cylinder, and a plurality of connecting blocks are fixedly arranged on the inner wall of the annular sleeve and matched with the outer wall of the conical cylinder.

[0007] Preferably, the diameter of the annular sleeve is the same as that of the bottom of the conical cylinder.

[0008] Preferably, a raised rib is longitudinally fixedly arranged on the outer wall of the conical cylinder near the bottom and on the outer wall of the annular sleeve.

[0009] Preferably, a hinge shaft is fixedly arranged on the sidewall of the bottom of the conical cylinder, and a bottom plate for plugging the opening of the bottom of the conical cylinder is hingedly arranged on the hinge shaft.

[0010] Preferably, a second exhaust hole and a first exhaust hole are respectively formed through the sidewall of the conical cylinder and the top plate.

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

[0012] 1、In the utility model, the detachable righting and guiding assembly is arranged on the outer wall of the conical cylinder near the top, the arrangement of the detachable righting and guiding assembly enables the same drilling tool to be used in soft stratum in the form of a conical cylinder drilling tool to efficiently drill and to be used in hard stratum in the form of a straight cylinder drilling tool to ensure the stability and precision of drilling, realizes multiple uses of one drilling tool, additionally reduces the frequency and time of frequently replacing drilling tools in the construction process, improves the drilling use efficiency, and simultaneously saves the cost of purchasing multiple different types of drilling tools.

[0013] 2、In the utility model, the detachable righting and guiding assembly comprises an annular sleeve arranged outside the top of the conical cylinder and having the same diameter as the bottom of the conical cylinder, and a plurality of connecting blocks are arranged on the outer wall of the top of the conical cylinder and the inner diameter of the annular sleeve, and a plurality of cavities are formed between the conical cylinder and the inner wall of the annular sleeve, when the righting and guiding assembly is installed, the drilling tool can effectively destroy the negative pressure environment formed by suction drilling when the drilling tool is pulled out of the pile hole with water and mud, plays a role of preventing suction drilling, and simultaneously avoids the phenomena of shrinkage hole and collapse. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional structure diagram of the utility model Figure 1 ;

[0015] Figure 2 It is a three-dimensional structure diagram of the utility model Figure 2 ;

[0016] Figure 3 It is a plane structure diagram of the utility model.

[0017] Figure 4 For the utility model Figure 3 Remove the structure diagram of the right guide assembly

[0018] Figure 5 For the utility model Figure 1 The local structure diagram

[0019] In the figure:

[0020] 1-conical cylinder, 2-top plate, 3-first exhaust hole, 4-connection square box, 5-second exhaust hole, 6-hinge shaft, 7-bottom plate, 8-control rod, 9-outer bottom plate, 10-tooth, 11-right guide assembly, 1101-through hole, 1102-annular sleeve, 1103-connection block, 1104-internal thread hole, 12-protruding rib. Specific implementation

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0022] As Figures 1-5 shown, a double-bottom rotary drilling head with a unique structure includes a conical cylinder 1, which is combined Figure 3 or Figure 4 shown, the conical cylinder 1 is set as a conical structure with a larger bottom diameter than a top diameter, which is combined Figure 1 shown, the top of the conical cylinder 1 is fixedly provided with a top plate 2, a connection square box 4 cooperating with a rotary drilling machine is vertically and fixedly arranged at the middle position of the top of the top plate 2, a first exhaust hole 3 communicating with the conical cylinder 1 is vertically and through-provided on the outside of the top plate 2 and located at the connection square box 4, a second exhaust hole 5 communicating with the conical cylinder 1 is transversely and through-provided on the sidewall of the conical cylinder 1, a hinge shaft 6 is fixedly arranged on the sidewall of the bottom of the conical cylinder 1, a bottom plate 7 for plugging the opening of the bottom of the conical cylinder 1 is hingedly arranged on the hinge shaft 6, a control rod 8 cooperating with the bottom plate 7 and used for controlling the opening and closing of the bottom plate 7 is vertically and through-provided in the conical cylinder 1 and the top plate 2, an outer bottom plate 9 is arranged at the bottom of the bottom plate 7, and a plurality of teeth 10 are fixedly arranged at the bottom of the outer bottom plate 9.

[0023] Specifically in this embodiment, combined Figure 1 with Figure 2As shown, the top outer wall of the conical barrel 1 is detachably provided with a centralizing and guiding assembly 11 with the same diameter as the bottom of the conical barrel 1. Preferably, the detachable centralizing and guiding assembly 11 enables the same drilling tool to be used in the form of a conical barrel drilling tool for efficient drilling in soft strata and in the form of a straight barrel drilling tool for ensuring the stability and precision of drilling in hard strata, thereby achieving multiple uses of one drilling tool. In addition, the frequency and time of changing drilling tools during construction are reduced, the drilling use efficiency is improved, the cost of purchasing multiple different types of drilling tools is saved, and further, in combination with Figure 4 As shown, Figure 5 The centralizing and guiding assembly 11 includes a plurality of through holes 1101 and an annular sleeve 1102 provided on the outer side of the conical barrel 1. Preferably, the maximum diameter of the annular sleeve 1102 is the same as the diameter of the bottom of the conical barrel 1, and the plurality of through holes 1101 are transversely provided on the outer wall of the conical barrel 1. The inner wall of the annular sleeve 1102 is fixedly provided with a plurality of connecting blocks 1103 which are matched with the outer wall of the conical barrel 1. A plurality of inner threaded holes 1104 corresponding to the through holes 1101 are transversely provided on the connecting blocks 1103. Further, when the annular sleeve 1102 is installed on the outer wall of the conical barrel 1, the bolts are transversely passed through the through holes 1101 from the inside to the outside of the conical barrel 1 and matched with the inner threaded holes 1104, in combination with Figure 4 As shown, Figure 5 The outer wall of the conical barrel 1 near the bottom and the outer wall of the annular sleeve 1102 are longitudinally fixedly provided with protruding ribs 12.

[0024] Preferably, a plurality of cavities are formed between the conical barrel 1 and the inner wall of the annular sleeve 1102. When the drilling tool is pulled out of the pile hole with water and mud, the cavities can effectively destroy the negative pressure environment formed by suction drilling, thereby preventing suction drilling and avoiding the phenomena of shrinkage and collapse.

[0025] Working principle:

[0026] When the pile diameter is hard, the centralizing and guiding assembly 11 is fastened and installed on the outer wall of the conical barrel 1 by bolts, so that the drilling tool becomes a straight barrel drilling tool structure. The centralizing and guiding assembly 11 can play a good centralizing role, the drilling is stable, and problems such as hole deviation and shrinkage of the drilling tool during drilling are prevented, thereby ensuring the stability of drilling. In addition, when the drilling tool is pulled out of the pile hole with water and mud, the centralizing and guiding assembly 11 can effectively destroy the negative pressure environment formed by suction drilling, thereby preventing suction drilling and avoiding the phenomena of shrinkage and collapse.

[0027] When the stratum is soft, the centralizing and guiding assembly 11 on the outer wall of the conical barrel 1 is removed to restore it to a conical barrel drilling tool. Due to the taper of the conical barrel, the drilling resistance is small in soft strata, and the residue is easily removed.

[0028] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No feature of the application is considered critical unless it is expressly stated in the claims.

Claims

1. A double bottom rotary excavating drill bit having a unique structure, characterized by: The utility model relates to a kind of cone cylinder (1) and the top plate (2) fixedly arranged in cone cylinder (1) top, the top of the top plate (2) is fixedly arranged with connecting square box (4), the bottom of the cone cylinder (1) is rotatably arranged with bottom plate (7), the cone cylinder (1) in and pass through top plate (2) are arranged with control rod (8) matched with bottom plate (7), the bottom of the bottom plate (7) is provided with outer bottom plate (9), the bottom of the outer bottom plate (9) is fixedly arranged with multiple teeth (10), the top outer wall of the cone cylinder (1) is detachably provided with righting guide assembly (11) with the same diameter as the diameter of the bottom of cone cylinder (1).

2. The dual bottom drag bit having a unique structure of claim 1, wherein: The righting guide assembly (11) includes a plurality of through holes (1101) and an annular sleeve (1102) disposed outside the cone cylinder (1), the plurality of through holes (1101) are transversely formed through the outer wall of the cone cylinder (1), and the inner wall of the annular sleeve (1102) is fixedly provided with a plurality of connecting blocks (1103) matched with the outer wall of the cone cylinder (1), and the plurality of connecting blocks (1103) are each transversely provided with an inner threaded hole (1104) corresponding to the through hole (1101).

3. The dual bottom drag bit having a unique structure of claim 2, wherein: The diameter of the annular sleeve (1102) is the same as the diameter of the bottom of the cone cylinder (1).

4. The dual bottom drag bit having a unique structure of claim 3, wherein: The outer wall of the annular sleeve (1102) is longitudinally fixedly provided with a protruding rib (12).

5. The dual bottom drag bit having a unique structure of claim 1, wherein: The side wall of the bottom of the cone cylinder (1) is fixedly provided with a hinge shaft (6), and the hinge shaft (6) is hingedly connected with the bottom plate (7) for sealing the opening of the bottom of the cone cylinder (1).

6. The dual bottom drag bit having a unique structure of claim 1, wherein: The side wall of the cone cylinder (1) and the top plate (2) are respectively provided with a second exhaust hole (5) and a first exhaust hole (3).

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