Combined spiral expanding drill bit

Abstract

The utility model relates to a combined spiral expanding drill bit, and belongs to the technical field of construction drilling tools in the building industry. The structure is composed of an upper structure and a lower structure. A spiral blade I is arranged on the outer circumference of a core tube I of the upper structure, an axial opening is formed in the outer circumference of the lower end part of the core tube I, a diameter expanding block is movably connected to the opening, and the diameter expanding block is connected with a diameter expanding device arranged in the core tube I through a yoke plate; a spiral blade II is arranged on the outer circumference of a core pipe II of the lower structure, the spiral blade II and the spiral blade I are the same in rotating direction, and the joint is kept continuous; the upper end surface of the core tube II is movably connected with the lower end surface of the core tube I; the lower end of the core tube II is movably connected with a drill tip assembly; an inner pipe is arranged in an inner cavity of the core pipe I, and an inner cavity of the inner pipe is communicated with an inner cavity of the core pipe II. The drill bit adopts a combined structure, and can be quickly disassembled without damaging the oil cylinder when the abraded part of the drill bit is repaired, so that the replacement efficiency is improved, the construction progress is ensured, and the drill bit cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a combined spiral expanding diameter drill bit belongs to the technical field of construction drill of building industry. BACKGROUND

[0002] In the existing spiral drill (extrusion) hole expanding diameter cast-in-place pile expanding diameter pile segment construction, the drill bit used is rotated out by using the oil cylinder to drive the expanding diameter block, the extruded hole wall rock-soil body is formed into an expanding diameter hole cavity, and then concrete is poured to form an expanding diameter pile segment, wherein, the spiral expanding diameter drill bit is internally provided with an expanding diameter device and is a whole structure, in construction, when the cutting part at the bottom end of the drill bit is greatly worn and affects the drilling efficiency, only the drill bit can be replaced for construction, and the removed drill bit is repaired, thus, at least 3-4 drill bits are prepared for a pile machine to meet normal construction requirements, resulting in high investment in construction drill bits; when the drill bit is replaced, the pipeline for supplying the oil cylinder is disassembled, which is troublesome and causes waste of hydraulic oil, environmental pollution; when the worn part at the bottom of the drill bit is welded and repaired, the welding heat is transmitted to the oil cylinder inside the drill bit, which easily causes damage to the oil cylinder sealing element, sealing leakage and affects the normal work of the expanding diameter block. SUMMARY

[0003] The utility model provides a combined spiral expanding diameter drill bit, the drill bit adopts the combined structure, when the worn part of the drill bit is repaired, the oil cylinder can be quickly disassembled without damage, not only improves the replacement efficiency, guarantees construction progress, and reduces the drill bit cost.

[0004] To solve the above problems, the specific technical scheme of the utility model is as follows: a combined spiral expanding diameter drill bit is composed of an upper structure and a lower structure; the outer circumference of a core pipe I of the upper structure is provided with spiral blades I, the outer circumference of the lower end of the core pipe I is provided with an axial opening, the expanding diameter block is movably connected at the opening, and the expanding diameter block is connected with an expanding diameter device arranged inside the core pipe I through a connecting plate; the outer circumference of a core pipe II of the lower structure is provided with spiral blades II, the spiral blades II are the same in rotation direction as the spiral blades I, and the joint is kept continuous; the upper end surface of the core pipe II is movably connected with the lower end surface of the core pipe I; the lower end of the core pipe II is movably connected with a drill tip assembly; an inner pipe is arranged in the inner cavity of the core pipe I, and the inner cavity of the inner pipe is communicated with the inner cavity of the core pipe II.

[0005] The lower end outer circumference of the core pipe I is symmetrically provided with upper double lugs I, the upper end of the core pipe II is symmetrically provided with upper single lugs I, the upper single lugs I are inserted into the upper double lugs I, and are positioned through pin shafts.

[0006] The lower end outer circumference of the core pipe I is symmetrically provided with upper single lugs II, the upper end of the core pipe II is symmetrically provided with upper double lugs II, the upper single lugs II are inserted into the upper double lugs II, and are positioned through pin shafts.

[0007] The lower end of the core pipe I is connected with the upper end of the core pipe II by screw thread.

[0008] The lower end of the core pipe II is symmetrically provided with a lower double lug plate on the outer circumference; two lug plates are symmetrically provided on both ends of the drill tip assembly, one of which is positioned and connected with the corresponding lower double lug plate by a pin; when the drill tip assembly is closed, the other lug plate is inserted into the corresponding lower double lug plate.

[0009] The gap between the two lug plates of the lower double lug plate is in a permeable structure with the inner cavity of the core pipe II, or in an independent non-permeable structure with the inner cavity of the core pipe II.

[0010] A limiting table is provided on the inner circumference of the lower end of the core pipe I, a centering disc is positioned and connected on the limiting table, a positioning hole is provided in the center of the upper end surface of the centering disc, and the lower end of the inner pipe is limited in the positioning hole of the centering disc; a connector is provided on the upper end of the core pipe I, and the upper end of the inner pipe is limited and connected with the connector.

[0011] The inner hole of the lower end of the core pipe I is provided with an inner pipe positioning hole, and the lower end of the inner pipe is positioned and connected with the inner pipe positioning hole; or the inner hole of the upper end of the core pipe II is provided with an inner pipe positioning hole, and the lower end of the inner pipe is positioned and connected with the inner pipe positioning hole; a connector is provided on the upper end of the core pipe I, and the upper end of the inner pipe is limited and connected with the connector.

[0012] The radial outer contour of the spiral blade II is in the shape of a cone or a column.

[0013] A cutting tooth is provided on the lower end of the spiral blade II.

[0014] The combined spiral reaming bit of the present application adopts the above structure and has the following advantages:

[0015] 1. The bit adopts a split structure, and for the lower structure with large wear, the worn parts can be easily replaced or repaired, thereby providing construction efficiency;

[0016] 2. The connection between the core pipe I and the core pipe II adopts a double lug plate and a single lug plate insertion structure, which not only realizes the integration of the upper structure and the lower structure, but also has a large torque transmission due to the cooperation of the symmetric double lug plate and the single lug plate, and is more suitable for the combined spiral reaming bit for construction of large pile hole diameters, and the effect is more obvious; the connection between the core pipe I and the core pipe II adopts a threaded pair connection, which is compact in structure and simple in processing and manufacturing, and is more economical for the combined spiral reaming bit for construction of small pile hole diameters;

[0017] 3. When the bottom of the combined spiral reaming bit is excessively worn during construction, only the lower structure needs to be disassembled and replaced, which is easy and simple to disassemble and install, short in time, and can ensure normal construction, and a pile machine only needs to be equipped with an upper structure of a bit and multiple lower structures of bits, thereby reducing the total investment cost of the bit;

[0018] 4. The lower structure is a part that is easily worn and needs to be repaired frequently. After being separated, it is light in weight, small in size, easy to disassemble, install, transport and move, convenient to maintain, fast to maintain and low in maintenance cost.

[0019] 5. The inner tube is located at the center of the core tube I and is positioned by the joint and the centering disc or the joint and the positioning hole at the lower end of the core tube I, so that it can be replaced regularly and prevent the concrete slurry from seeping into the outer part of the inner tube due to the leakage caused by the wear and thinning of the inner tube wall, thereby damaging the oil cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0021] Figure 2 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0022] Figure 3 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0023] Figure 4-1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0024] Figure 4-2 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0025] Figure 5 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 1 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0026] Figure 6 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 3

[0027] Figure 7 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0028] Figure 8 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 7 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0029] Figure 9 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 7 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0030] Figure 10 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state).

[0031] Figure 11 It is a front view schematic diagram of the combined spiral reamer bit of Example One (the drill tip assembly is in the open state). Figure 10 ​Side view (drill tip assembly closed, expansion block partially rotated out state).

[0032] Figure 12 For Figure 10 Mid D-D cross-sectional view. DETAILED DESCRIPTION Example One

[0033] As Figures 1 to 3 shown, a combined spiral expansion drill bit is composed of an upper structure 100 and a lower structure 200; the outer circumference of the core pipe I 103 of the upper structure 100 is provided with spiral blades I 102, the lower end of the core pipe I 103 is provided with an axial opening, the opening is movably connected with the expansion block 108, and the expansion block 108 is connected with the expansion device arranged inside the core pipe I 103 through the connecting plate 112; the expansion device includes a connecting rod structure driven by the piston rod of the oil cylinder 104 to rotate the expansion block 108, thereby realizing the function of expansion construction of the drill bit. The specific structure of the expansion device is disclosed in the authorized announcement No. CN 215860002 U "Expansion device for spiral drill bit".

[0034] The outer circumference of the core pipe II 203 of the lower structure 200 is provided with spiral blades II 201, the spiral blades II 201 have the same rotation direction as the spiral blades I 102, and the joint is continuous; the radial outer contour of the spiral blades II 201 is in the shape of a cone, the lower end of the spiral blades II 201 is provided with cutting teeth 202, the conical structure improves the soil squeezing drilling efficiency, and the cutting teeth 202 improve the rock-soil crushing efficiency; the upper end surface of the core pipe II 203 is movably connected with the lower end surface of the core pipe I 103; the lower end of the core pipe II 203 is movably connected with the drill tip assembly 204; the inner pipe 113 is arranged in the inner cavity of the core pipe I 103 and used as a channel for concrete pouring, and the inner cavity of the inner pipe 113 is in communication with the inner cavity of the core pipe II 203. The structure of the drill tip assembly 204 is disclosed in the specification of the authorized announcement No. CN 112900424 A "Concrete bored pile with mixing layer wrapped pile section, pile forming drill bit and construction method", which discloses the structure of the drill tip assembly. The structure belongs to the existing structure.

[0035] As Figure 4-1 shown, the lower end of the core pipe I 103 is symmetrically provided with upper double lugs I 103-2A, and the upper end of the core pipe II 203 is symmetrically provided with upper single lugs I 203-1A, the upper single lugs I 203-1A are inserted into the upper double lugs I 103-2A and are positioned and connected through the pin shaft 300. As Figure 4-2As shown in the figure, or the outer circumference of the lower end of the core tube I 103 is symmetrically provided with an upper single lug II 103-2B, and the upper end of the core tube II 203 is symmetrically provided with an upper double lug II 203-1B, the upper single lug II 203-2B is inserted into the upper double lug II 103-1B, and is connected and positioned through the pin shaft 300. Through the insertion structure of the single lug and the double lug, the connectivity of the core tube I 103 and the core tube II 203 is realized, and large rotary torque can be transmitted at the same time.

[0036] As shown in the figure, Figure 5 The lower end of the core tube II 203 is symmetrically provided with a lower double lug 203-2; the two ends of the drill tip assembly 204 are symmetrically provided with lug plates 204-1, one of which is connected and positioned inside the corresponding lower double lug 203-2 through the pin 400; the other lug plate 204-1 is inserted into the corresponding lower double lug 203-2 when the drill tip assembly 204 is in a closed state; the gap between the two lug plates of the lower double lug 203-2 is in a permeable structure with the inner cavity of the core tube II 203, which is convenient for processing, and the drill tip assembly 204 is easy to install and can transmit large torque. The lower double lug 203-2 and the lug plate 204-1 are inserted, realizing the transmission of torque between the core tube II 203 and the drill tip assembly 204.

[0037] As shown in the figure, Figure 6 A limiting table is arranged on the inner circumference of the lower end of the core tube I 103, a centering disc 111 is connected and positioned on the limiting table, a positioning hole is arranged in the center of the upper end surface of the centering disc 111, and the lower end of the inner tube 113 is limited in the positioning hole of the centering disc 111; a connector 101 is arranged on the upper end of the core tube I 103, and the upper end of the inner tube 113 is limited and connected with the connector 101. The inner tube 113 is limited through the positioning hole on the centering disc 111 and the connector 101, so as to ensure that the inner tube 113 is located in the center of the inner cavity of the core tube I 103. Example two

[0038] As shown in the figure, Figures 7 to 9 The lower end of the core tube I 103 is internally threaded, the upper end of the core tube II 203 is externally threaded, and the lower end of the core tube I 103 and the upper end of the core tube II 203 are connected through threads.

[0039] An inner tube positioning hole is arranged in the inner hole of the upper end of the core tube II 203, and the lower end of the inner tube is connected and positioned with the inner tube positioning hole; a connector 101 is arranged on the upper end of the core tube I 103, and the upper end of the inner tube 113 is limited and connected with the connector 101.

[0040] The remaining structures are the same as those of example one. Example three

[0041] As shown in the figure, Figures 10 to 12 The lower end of the core tube I 103 is externally threaded, the upper end of the core tube II 203 is internally threaded, and the lower end of the core tube I 103 and the upper end of the core tube II 203 are connected through threads.

[0042] The inner hole of the lower end of the core pipe 103 is provided with an inner tube positioning hole, and the lower end of the inner tube 113 is positioned and connected with the inner tube positioning hole; a joint 101 is arranged at the upper end of the core pipe 103, and the upper end of the inner tube 113 is limitingly connected with the joint 101.

[0043] The gap between the two ear plates of the lower double-ear piece 203-2 is independent of the non-penetrating structure of the inner cavity of the core pipe 203, which improves the overall strength of the core pipe 203.

[0044] The radial outer contour of the spiral blade 201 is in the shape of a cylinder.

[0045] The remaining structures are the same as those of Example 1.

Claims

1. A modular spiral reamer bit, characterized by: The application relates to a core tube structure of a core drill, which is composed of an upper structure (100) and a lower structure (200); the outer periphery of a core tube I (103) of the upper structure (100) is provided with spiral blades I (102), the lower end of the core tube I (103) is provided with an axial opening, an expanding block (108) is movably connected to the opening, the expanding block (108) is connected with an expanding device arranged in the core tube I (103) through a connecting plate (112); the outer periphery of a core tube II (203) of the lower structure (200) is provided with spiral blades II (201), the spiral blades II (201) are of the same rotation direction as the spiral blades I (102) and keep continuity at the joint; the upper end of the core tube II (203) is movably connected with the lower end of the core tube I (103); the lower end of the core tube II (203) is movably connected with a drill tip assembly (204); an inner tube (113) is arranged in the inner cavity of the core tube I (103), and the inner cavity of the inner tube (113) is communicated with the inner cavity of the core tube II (203).

2. The modular spiral expandable drill bit of claim 1, wherein: The lower end of the core tube I (103) is symmetrically provided with upper double-ear pieces I (103-2A), the upper end of the core tube II (203) is symmetrically provided with upper single-ear pieces I (203-1A), the upper single-ear pieces I (203-1A) are inserted into the upper double-ear pieces I (103-2A) and are connected and positioned through pin shafts (300).

3. The modular spiral expandable drill bit of claim 1, wherein: The lower end of the core tube I (103) is symmetrically provided with upper single-ear pieces II (103-2B), the upper end of the core tube II (203) is symmetrically provided with upper double-ear pieces II (203-1B), the upper single-ear pieces II (203-2B) are inserted into the upper double-ear pieces II (103-1B) and are connected and positioned through pin shafts (300).

4. The modular spiral expandable drill bit of claim 1, wherein: The lower end of the core tube I (103) is connected with the upper end of the core tube II (203) through threads.

5. The modular spiral expandable drill bit of claim 1, wherein: The lower end of the core tube II (203) is symmetrically provided with lower double-ear pieces (203-2), lug plates (204-1) are symmetrically arranged at the two ends of the drill tip assembly (204), one of the lug plates (204-1) is connected and positioned with the corresponding lower double-ear piece (203-2) through a pin (400), and the other lug plate (204-1) is inserted into the corresponding lower double-ear piece (203-2) when the drill tip assembly (204) is in a closed state.

6. The modular spiral expandable drill bit of claim 5, wherein: The gap between the two ear plates of the lower double-ear piece (203-2) is a through structure communicated with the inner cavity of the core tube II (203) or is an independent non-through structure.

7. The modular spiral expandable drill bit of claim 1, wherein: A limiting table is arranged on the inner periphery of the lower end of the core tube I (103), a centering disc (111) is positioned and connected on the limiting table, a positioning hole is arranged in the center of the upper end surface of the centering disc (111), the lower end of the inner tube (113) is limited in the positioning hole of the centering disc (111), a joint (101) is arranged on the upper end of the core tube I (103), and the upper end of the inner tube (113) is limited and connected with the joint (101).

8. The modular spiral expandable drill bit of claim 1, wherein: The inner hole of the lower end of the core pipe I (103) is provided with an inner pipe positioning hole, and the lower end of the inner pipe (113) is positioned and connected with the inner pipe positioning hole; or the inner hole of the upper end of the core pipe II (203) is provided with an inner pipe positioning hole, and the lower end of the inner pipe (113) is positioned and connected with the inner pipe positioning hole; a joint (101) is arranged at the upper end of the core pipe I (103), and the upper end of the inner pipe (113) is limitingly connected with the joint (101).

9. The modular spiral expandable drill bit of claim 1, wherein: The radial outer contour of the spiral blade II (201) is in the shape of a cone or a column.

10. The modular spiral reamer bit of claim 1, wherein: A cutting tooth (202) is arranged at the lower end of the spiral blade II (201).

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