Rotary drilling bit and rotary drilling rig

Abstract

The utility model provides a rotary drilling bit and a rotary drilling rig, the rotary drilling bit comprises a cylinder, a heading head and an extrusion mechanism, and the heading head is mounted at one end of the cylinder; the extrusion mechanism comprises a pressing plate and a linear driving piece, an arc-shaped containing groove is formed in the periphery of the barrel, and the pressing plate is slidably connected into the containing groove in the radial direction of the barrel; the linear driving part is arranged on the cylinder and arranged in the radial direction of the cylinder, the fixed end of the linear driving part is fixedly connected to the cylinder, and the driving end of the linear driving part is fixedly connected to the side wall, close to the cylinder, of the pressing plate. When the rotary excavating drill bit is stuck, the linear driving piece drives the extrusion plate to extrude the inner wall of the pile hole outwards, rock soil around the barrel is compressed outwards, and therefore the pile hole is enlarged, and the situation that the rotary excavating drill bit is stuck is relieved; and in addition, after the inner wall of the pile hole is extruded through the pressing plate, the inner wall of the pile hole becomes compact, and the problem that the pile hole deforms towards the interior of the pile hole is further solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pile driving machinery technical field, concretely relates to a rotary drilling head and rotary drilling rig. BACKGROUND

[0002] The rotary drilling rig is widely applied to the hole forming operation of building foundation engineering, such as cast-in-place pile, continuous wall, foundation reinforcement and various foundation construction. The existing rotary drilling rig drills vertically downward through the rotary drilling head, the head of the rotary drilling head has digging teeth, and a cylindrical accommodating cavity is arranged on the head, and an opening is arranged at the digging teeth of the head, so that the soil dug in the digging process can directly enter the accommodating cavity through the opening to be collected, the rotary drilling head is pulled out from the hole after being filled, and the soil in the accommodating cavity is poured on the ground, and the process is repeated until the depth of the pile hole reaches the design requirement.

[0003] During the construction of some soft soil layer foundation, the existing rotary drilling rig is prone to jamming after drilling, because the soil layer above the pile hole is prone to loosening, so part of the soil moves towards the middle of the hole, thereby reducing the diameter of the pile hole above, resulting in the rotary drilling head being stuck when pulled out, and even causing the rotary drilling head to break in the pile hole, which brings great difficulty to the pile hole construction.

[0004] Therefore, there is an urgent need for a rotary drilling head and rotary drilling rig to solve or at least partially solve the problems in the prior art. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a rotary drilling head, which aims to solve the problem of the existing rotary drilling head being prone to jamming during soft soil layer foundation construction, and the specific technical scheme is as follows:

[0006] A rotary drilling head, comprising a cylinder, a drilling head and an extrusion mechanism, the drilling head is installed at one end of the cylinder; the extrusion mechanism comprises a pressing plate and a linear drive, the cylinder is provided with an arc-shaped accommodating groove, the pressing plate is slidably connected in the accommodating groove along the radial direction of the cylinder; the linear drive is arranged on the cylinder, and the linear drive is arranged along the radial direction of the cylinder, the fixed end of the linear drive is fixedly connected to the cylinder, and the driving end of the linear drive is fixedly connected to the side wall of the pressing plate close to the cylinder.

[0007] Further, a plurality of accommodating grooves are arranged along the circumferential direction of the cylinder, and a plurality of pressing plates and linear drives are arranged corresponding to the accommodating grooves.

[0008] Further, two linear drives are arranged corresponding to each pressing plate, and the two linear drives are arranged side by side along the axis direction of the cylinder.

[0009] Further, the outer surface of the pressing plate is a circular arc surface, and when the pressing plate works at the retracted position, the outer surface of the pressing plate is flush with the outer surface of the cylinder.

[0010] Further, the cylinder body is further provided with an annular groove, the annular groove is arranged around the accommodating groove; the edge of the pressing plate is arranged to protrude towards the inside of the annular groove, and a fender is arranged in the annular groove and is connected to the annular groove in a sliding manner along the extending direction of the linear driving element.

[0011] Further, the cylinder body is further provided with an accommodating cavity between the cylinder body and the heading head, the cylinder body is provided with a flat pressing hole, a first end of the flat pressing hole is in communication with the accommodating cavity, and a second end of the flat pressing hole is in communication with the accommodating groove.

[0012] Further, the rotary drilling head further comprises a filter assembly, the filter assembly is installed at the flat pressing hole of the cylinder body, and the filter assembly is arranged to cover the flat pressing hole.

[0013] Further, the filter assembly comprises a filter layer and a wire mesh, the filter layer is arranged in the flat pressing hole, and the wire mesh is installed at an orifice of the flat pressing hole close to the accommodating cavity and is arranged to cover the flat pressing hole.

[0014] Further, the cylinder body is provided with a through hole at an end away from the heading head, a first end of the through hole is in communication with the accommodating cavity, and a second end of the through hole is in communication with the outside.

[0015] The technical scheme of the utility model has the following beneficial effects:

[0016] When some loose soil layers are excavated, the upper soil layers may be deformed and extruded to the middle part of the pile hole, which easily causes the rotary drilling head to be stuck. When the rotary drilling head is stuck, the linear driving element is used to drive the extrusion plate to extrude the inner wall of the pile hole, so that the soil around the cylinder body is compressed outward, the pile hole is enlarged, and the rotary drilling head is unstuck. In addition, after the inner wall of the pile hole is extruded by the pressing plate, the inner wall of the pile hole becomes compact, and the problem of deformation of the pile hole is further improved.

[0017] The utility model also provides a rotary drilling machine, and specific schemes are as follows:

[0018] The utility model provides a rotary drilling machine, which comprises a vehicle body, a drill rod and the rotary drilling head, the drill rod is rotatably installed on the vehicle body, one end of the cylinder body away from the heading head is provided with a connecting head, and the cylinder body is detachably installed on the head of the drill rod through the connecting head.

[0019] In addition to the purposes, characteristics and advantages described above, the utility model has other purposes, characteristics and advantages. The following will be described in detail with reference to the drawings. Figures 1-5 The utility model will be further described in detail. DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are provided to enable a person skilled in the art to make or use the present application and to provide the best embodiment of the present application. In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of a rotary drill bit of the present application;

[0022] Figure 2 is a schematic diagram of the internal structure of the rotary drill bit when the pressure plate is extended;

[0023] Figure 3 is Figure 2 is an enlarged view of position A in the middle;

[0024] Figure 4 is a schematic diagram of the internal structure of the rotary drill bit when the pressure plate is retracted;

[0025] Figure 5 is a schematic diagram of the overall structure of a rotary drill rig of the present application.

[0026] Wherein, 1, barrel; 11, accommodating groove; 12, ring groove; 13, accommodating cavity; 14, flat pressing hole; 15, via hole; 2, heading head; 3, extrusion mechanism; 31, pressure plate; 311, fender; 32, linear driving part; 4, filter assembly; 41, filter layer; 42, wire mesh; 5, vehicle body; 6, drill rod. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below, and a preferred embodiment of the present application is given. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0029] Embodiment:

[0030] Referring to Figures 1-5The embodiment provides a rotary drilling head, which comprises a barrel 1, a boring head 2 and an extrusion mechanism 3, the boring head 2 is installed at one end of the barrel 1; the extrusion mechanism 3 comprises a pressing plate 31 and a linear driving part 32, an arc-shaped accommodating groove 11 is arranged on the outer periphery of the barrel 1, the pressing plate 31 is slidably connected in the accommodating groove 11 along the radial direction of the barrel 1; the linear driving part 32 is arranged on the barrel 1 and is arranged along the radial direction of the barrel 1, the fixed end of the linear driving part 32 is fixedly connected to the barrel 1, and the driving end of the linear driving part 32 is fixedly connected to the side wall of the pressing plate 31 close to the barrel 1.

[0031] Specifically, the boring head 2 is installed at the head of the barrel 1, boring teeth are arranged on the boring head 2, the boring teeth are driven to bore by the rotation of the barrel 1, and the rock-soil layer is bored, the front end of the boring head 2 is provided with a feeding hole, and the rock-soil bored by the boring teeth can enter the barrel 1 through the feeding hole and be stored in the barrel 1.

[0032] It can be known that when some loose rock-soil layers are bored, the upper rock-soil layer may be extruded and deformed to the middle of the pile hole, which easily causes the rotary drilling head to be stuck. When the rotary drilling head is stuck, the linear driving part 32 drives the extrusion plate 31 to extrude the inner wall of the pile hole outward, so that the rock-soil around the barrel 1 is compressed outward, thereby increasing the size of the pile hole and solving the problem that the rotary drilling head is stuck; in addition, after the inner wall of the pile hole is extruded by the pressing plate 31, the inner wall of the pile hole becomes compact, thereby further improving the problem that the pile hole is deformed to the inner wall of the pile hole.

[0033] It should be noted that in the embodiment of the application, the linear driving part 32 is a hydraulic oil cylinder, the cylinder body of the hydraulic oil cylinder is detachably connected in the barrel 1, and the piston rod of the hydraulic oil cylinder is detachably connected with the pressing plate 31 through the barrel 1. Of course, in some embodiments, the cylinder body of the hydraulic oil cylinder can be integrally arranged with the barrel 1, and the piston rod can be integrally arranged with the pressing plate 31. Of course, the linear driving part 32 can also be an electric push rod, the electric push rod is fixedly connected to the barrel 1, and the driving end of the electric push rod is fixedly connected to the pressing plate 31 through the barrel 1. The pressing plate 31 is pushed out of the accommodating groove 11 by the hydraulic oil cylinder or the electric push rod and moves to the outside of the barrel 1, or is retracted into the accommodating groove 11.

[0034] Further, a plurality of accommodating grooves 11 are circumferentially spaced apart on the barrel 1, and a plurality of pressing plates 31 and linear driving parts 32 are arranged corresponding to the accommodating grooves 11.

[0035] Specifically, in the embodiment, four accommodating grooves 11 and four pressing plates 31 are arranged circumferentially, each accommodating groove 11 occupies an angle of a circle within 60 degrees, if the angle is too large, the strength of the barrel 1 will be greatly weakened, therefore, the angle occupied by each accommodating groove 11 should not be too large.

[0036] It can be known that by arranging four pressing plates 31 circumferentially, when the rotary drill bit is stuck, the four pressing plates 31 are simultaneously moved outward to compact the inner wall of the pile hole, so that the diameter of the pile hole is increased. The advantage of simultaneously distributing the four pressing plates 31 is that the positions of the pile holes in the same horizontal plane can be compacted by one compaction. It should be noted that in some other embodiments of the present application, two pressing plates 31, three pressing plates 31 or more pressing plates 31 can also be provided. Of course, the more the number of pressing plates 31, the more the accommodating grooves 11 are provided, and the angle of the corresponding central angle of each accommodating groove 11 also needs to be correspondingly reduced.

[0037] Further, two straight-line driving members 32 are arranged corresponding to each pressing plate 31, and the two straight-line driving members 32 are arranged side by side along the axis direction of the barrel 1.

[0038] It can be known that the barrel 1 is long, and the pressing plate 31 is arranged in a long strip shape. If only one straight-line driving member 32 is arranged in the middle of the pressing plate 31, although the purpose of compaction and hole expansion can be achieved, the arrangement of two parallel straight-line driving members 32 can further improve the stability of the movement of the pressing plate 31 and improve the rigidity and service life of the pressing plate 31. It can be known that three or even more straight-line driving members 32 can also be arranged corresponding to each pressing plate 31.

[0039] Further, the outer surface of the pressing plate 31 is a circular arc surface, and when the pressing plate 31 works in the retracted position, the outer surface of the pressing plate 31 is flush with the outer surface of the barrel 1.

[0040] It can be known that through the arrangement of the circular arc surface, when the pressing plate 31 is retracted, the outer surface of the pressing plate 31 is flush with the outer surface of the barrel 1, so that when the rotary drill is drilling, the pressing plate 31 will not generate additional resistance to the drill bit, and the rotary drill can work normally.

[0041] Further, the barrel 1 is further provided with a ring groove 12, and the ring groove 12 is arranged around the accommodating groove 11; the edge of the pressing plate 31 is arranged to protrude into the ring groove 12 and is provided with a mud guard 311, and the mud guard 311 is slidingly connected in the ring groove 12 along the extension direction of the straight-line driving member 32.

[0042] It can be known that when the pressing plate 31 is extended, the mud guard 311 moves with the pressing plate 31, and through the arrangement of the mud guard 311, the mud guard 311 blocks the rock soil when the pressing plate 31 is extended, so as to prevent the rock soil from entering the accommodating groove 11, so that the pressing plate 31 can be smoothly retracted after being extended.

[0043] Further, the barrel 1 and the tunneling head 2 are provided with a receiving cavity 13, the barrel 1 is provided with a flat pressing hole 14, the first end of the flat pressing hole 14 communicates with the receiving cavity 13, and the second end of the flat pressing hole 14 communicates with the accommodating groove 11.

[0044] It can be known that if the flat pressure hole 14 does not exist, when the pressing plate 31 is stretched out, a vacuum negative pressure is formed in the accommodating groove 11, thereby preventing the pressing plate 31 from stretching out. By arranging the flat pressure hole 14, when the pressing plate 31 is stretched out, external gas or mud enters from the flat pressure hole 14, balancing the pressure difference inside and outside the accommodating groove 11, thereby reducing the resistance of the pressing plate 31 from the accommodating groove 11, so as to reduce the energy consumption. It is worth noting that the flat pressure hole 14 is arranged at one end close to the heading head 2, so that the gas or mud can enter or be discharged from the accommodating groove 11 smoothly.

[0045] Further, the rotary drill bit further comprises a filter assembly 4, the filter assembly 4 is installed at the flat pressure hole 14 on the barrel 1, and the filter assembly 4 covers the flat pressure hole 14; the filter assembly 4 comprises a filter layer 41 and a wire mesh 42, the filter layer 41 is arranged in the flat pressure hole 14, and the wire mesh 42 is installed at an orifice of the flat pressure hole 14 close to the containing cavity 13 and covers the flat pressure hole 14.

[0046] It can be known that when the rotary drill bit is drilling, the rotary drill bit is full of mud and rock, the large particles in the mud are blocked by the wire mesh 42, and the mud filtered by the wire mesh 42 is filtered again by the filter layer 41, so that large particle substances in the mud are prevented from entering the accommodating groove 11 and causing resistance when the pressing plate 31 is retracted. The filter layer 41 can adopt a cotton filter element to block the large particle substances in the mud.

[0047] Further, the end of the barrel 1 away from the heading head 2 is provided with a through hole 15, a first end of the through hole 15 is in communication with the containing cavity 13, and a second end of the through hole 15 is in communication with the outside.

[0048] It can be known that in the process of excavation, the rock soil continuously enters the containing cavity 13 from the feeding hole at the heading head 2, because there is air in the containing cavity 13 in the initial state, if the through hole 15 is not arranged, after the rock soil enters the containing cavity 13, the air is compressed, and the compressed air will prevent the external rock soil from continuously entering the containing cavity 13, thereby making the rotary drill bit difficult to excavate in the process of excavation; and by arranging the through hole 15, when the rock soil enters the containing cavity 13, the gas is discharged through the through hole 15, the gas pressure in the containing cavity 13 does not rise, and the subsequent rock soil entering the containing cavity 13 is not hindered, thereby enabling the rotary drill bit to smoothly excavate in the process of excavation.

[0049] The working principle of the utility model is as follows:

[0050] The cylinder 1 drives the tunneling head 2 to tunnel downward, and as the depth of the pile hole tunneling is deeper, the rock-soil layer above the pile hole may be extruded towards the pile hole, thereby causing the rotary drilling head to be stuck when pulled upward. When stuck, the straight-line driving member 32 drives the pressing plate 31 to move outward to press the inner wall of the pile hole, so that the pile hole is enlarged. The pressing plates 31 are arranged at intervals on the cylinder 1, so that the position of the pile hole deviating from the pressing plate 31 is not compacted. The straight-line driving member 32 drives the pressing plate 31 to retract into the accommodating groove 11, at this time, the resistance of the cylinder 1 is smaller, the cylinder 1 is rotated, the pressing plate 31 corresponds to the position of the pile hole wall which is not compacted, and the straight-line driving member 32 drives the pressing plate 31 to compact the position which is not compacted, and then drives the pressing plate 31 to retract into the accommodating groove 11, at this time, the compacted pile hole wall and the cylinder 1 have a gap, the stuck is released, and the rotary drilling head can be pulled out smoothly.

[0051] The utility model also provides a rotary drilling rig, and the specific scheme is as follows:

[0052] A rotary drilling rig comprises a vehicle body 5, a drill rod 6 and the rotary drilling head, the drill rod 6 is rotatably installed on the vehicle body 5, a connecting head is arranged at the end of the cylinder 1 away from the tunneling head 2, and the cylinder 1 is detachably installed on the head of the drill rod 6 through the connecting head. The drill rod 6 drives the rotary drilling head to rotate to carry out drilling construction.

[0053] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can be changed and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An earth boring drill bit comprising: The utility model relates to a rotary drilling head, including barrel (1), heading head (2) and extrusion mechanism (3), heading head (2) is installed in one end of barrel (1), Extrusion mechanism (3) includes pressing plate (31) and linear drive (32), and the outer periphery of barrel (1) is provided with arc accommodating groove (11), and pressing plate (31) is slidably connected in accommodating groove (11) along the radial direction of barrel (1), Linear drive (32) is arranged on barrel (1), and linear drive (32) is arranged along the radial direction of barrel (1), and the fixed end of linear drive (32) is fixedly connected on barrel (1), and the driving end of linear drive (32) is fixedly connected on the side wall of pressing plate (31) close to barrel (1).

2. The rotary drilling head according to claim 1, wherein: A plurality of accommodating grooves (11) are circumferentially spaced apart on the barrel (1), and a plurality of pressing plates (31) and linear drives (32) are arranged corresponding to the accommodating grooves (11).

3. The rotary drilling head according to claim 2, wherein: Two linear drives (32) are arranged corresponding to each pressing plate (31), and the two linear drives (32) are arranged side by side along the axial direction of the barrel (1).

4. The rotary drilling head according to claim 1, wherein: The outer surface of the pressing plate (31) is a circular arc surface, and when the pressing plate (31) works in the retracted position, the outer surface of the pressing plate (31) is flush with the outer surface of the barrel (1).

5. The rotary drilling head according to claim 1, wherein: A ring groove (12) is further provided on the barrel (1), and the ring groove (12) surrounds the accommodating groove (11); A fender (311) is protrudingly arranged on the edge of the pressing plate (31) towards the inside of the ring groove (12), and the fender (311) is slidably connected in the ring groove (12) along the extension direction of the linear drive (32).

6. The rotary drilling head according to any one of claims 1-5, wherein: A containing cavity (13) is provided between the barrel (1) and the heading head (2), a flat pressing hole (14) is provided on the barrel (1), a first end of the flat pressing hole (14) is in communication with the containing cavity (13), and a second end of the flat pressing hole (14) is in communication with the accommodating groove (11).

7. The rotary drilling head according to claim 6, further comprising a filter assembly (4), wherein the filter assembly (4) is installed at the flat pressing hole (14) on the barrel (1), and the filter assembly (4) covers the flat pressing hole (14).

8. The rotary drilling head according to claim 7, wherein: The filter assembly (4) comprises a filter layer (41) and a wire mesh (42), the filter layer (41) is arranged in the flat pressing hole (14), and the wire mesh (42) is installed at the opening of the flat pressing hole (14) close to the containing cavity (13) and covers the flat pressing hole (14). ​ 9. The earth-boring drill bit of claim 6, wherein: The end of the barrel (1) away from the digging head (2) is provided with a through hole (15), the first end of the through hole (15) is in communication with the accommodating cavity (13), and the second end of the through hole (15) is in communication with the outside.

10. A rotary drilling rig characterized by: The drill bit of any one of claims 1-9, comprising a vehicle body (5), a drill rod (6), and the drill bit, the drill rod (6) being rotatably mounted on the vehicle body (5), and the barrel (1) being arranged with a connecting head at an end away from the digging head (2), the barrel (1) being detachably mounted on the head of the drill rod (6) through the connecting head.

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