Novel conical drill bit of rotary drilling rig

Abstract

The utility model discloses a novel rotary drilling rig's conical drill bit, including: car body, mast, drill stem, pressurizing device, mounting cavity, drill bit subassembly and winch plant, wherein the mast is installed on the car body, the mast is connected with drill stem, one end of drill stem is connected with pressurizing device, the other end is connected with winch plant, and the drill bit subassembly is connected with the mounting cavity. The end, away from the drill rod, of the pressurizing device is connected with the mounting cavity, and the end, away from the pressurizing device, of the mounting cavity is connected with a drill bit assembly; the drill bit assembly comprises a drill bit main body, a conical end, drill tips, a cleaning assembly and a reaming assembly, the drill bit main body is connected to the end, away from the pressurizing device, of the mounting cavity, the conical end is arranged at the tail end of the drill bit main body, and the drill tips are mounted at the conical end; a cleaning assembly is arranged in the drill bit body, and the reaming assembly is installed on the drill bit body.

Description

Technical Field

[0001] The utility model relates to the field of hard rock pile foundation drilling, in particular to a novel conical drill bit of a rotary drilling rig. Background Art

[0002] Pile foundations are required when constructing super-large bridges. For example, the Huoxianggou super-large bridge in the Qingyang transit section of G244 line has a mudstone layer 30m deep under the pile body of the No. 16 main pier. Its maximum natural uniaxial compressive strength can reach 61.3Mpa, and its maximum saturated uniaxial compressive strength can reach 51.5Mpa.

[0003] The mudstone layer at the bottom of the pile body is very strong. Conventional rotary drill bits are prone to slipping when encountering water, which makes drilling in the mudstone layer difficult and results in extremely low efficiency. The drilling time for a single pile exceeds 15 days. The required hole expansion size varies for different projects. Existing rotary drill bits require manual addition of expansion parts to perform the expansion operation and place the casing. In order to accommodate the expansion requirements of different needs, expansion parts of various sizes must be prepared, which is cumbersome, complicated, and costly. Most existing rotary drill bits use a shaking method to clean the drill cuttings inside. If the drill cuttings have a high viscosity when exposed to water, it is difficult to shake them clean thoroughly, affecting the subsequent drilling efficiency and the efficiency of the slag removal.

[0004] Therefore, a novel tapered drill bit of a rotary drilling rig is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a novel conical drill bit for a rotary drilling rig, comprising: a vehicle body, a mast, a drill rod, a pressure device, a mounting cavity, a drill bit assembly, and a hoisting device, wherein the mast is mounted on the vehicle body, the drill rod is connected to the mast, one end of the drill rod is connected to the pressure device, and the other end is connected to the hoisting device, the end of the pressure device away from the drill rod is connected to the mounting cavity, and the end of the mounting cavity away from the pressure device is connected to the drill bit assembly;

[0006] The drill bit assembly includes: a drill bit body, a tapered end, a drill tip, a cleaning assembly and a reaming assembly, wherein the drill bit body is connected to the end of the mounting cavity away from the pressurizing device, the tapered end is provided at the end of the drill bit body, and multiple groups of drill tips are installed on the tapered end. A cleaning assembly is provided inside the drill bit body, and the reaming assembly is installed on the drill bit body.

[0007] Further, as a preference, the cleaning assembly includes: a support disk, a driving member 1, a rotary shaft and a cleaning rod group, the support disk is fixedly connected to the mounting cavity, the driving member 1 is provided on the support disk, the output end of the driving member 1 is connected to the rotary shaft, the rotary shaft can rotatably pass through the support disk and the mounting cavity and extend to the inside of the drill bit body, and the end of the rotary shaft is connected to the cleaning rod group.

[0008] Further, as a preference, the cleaning rod group includes: a cleaning horizontal rod, a cleaning vertical rod and a cleaning oblique rod, wherein the cleaning horizontal rod is configured into two groups, the two groups of cleaning horizontal rods are cross-shaped and detachably connected to the end of the rotating shaft, the two ends of the two groups of cleaning horizontal rods are detachably connected to the cleaning vertical rods, and the four groups of cleaning vertical rods are fixedly connected to the cleaning oblique rods at one end away from the cleaning horizontal rod.

[0009] Furthermore, as a preference, the top of the cleaning cross bar can slide against the top of the inner part of the drill body, and one side of the four groups of cleaning vertical rods can be detachably connected with an arc scraper, and the side of the arc scraper away from the cleaning vertical rod can slide against the inner wall of the drill body, and the four groups of cleaning inclined rods are respectively and evenly distributed with cleaning blocks, and the end of the cleaning block away from the cleaning inclined rod can slide against the inner wall of the tapered end, and the conical structure formed by the four groups of cleaning inclined rods cooperates with the inner wall of the tapered end.

[0010] Further, as a preference, the reaming assembly includes: a base plate, a second driving member, a main gear, a sub-gear and a rotating shaft, wherein the base plate is fixedly connected to the side of the support plate close to the pressure device in the installation cavity, the second driving member is provided at the center of the base plate, the output end of the second driving member is connected to the main gear, five groups of the sub-gears are circumferentially arranged on the base plate, the five groups of the sub-gears are semi-circular teeth, the five groups of the sub-gears are respectively meshed with the main gear, the output ends of the five groups of the sub-gears are respectively fixedly connected to the rotating shaft, the rotating shaft can rotatably pass through the base plate, the support plate and the installation cavity and extend to the peripheral wall of the drill body.

[0011] Further, as a preference, five groups of accommodating openings are opened on the circumference of the drill body, the five groups of accommodating openings respectively correspond to the five groups of rotating shaft positions, and the five groups of rotating shafts are respectively fixedly sleeved with expansion pieces at the positions of the accommodating openings.

[0012] Further, preferably, a reaming portion is provided on one end of the reaming member away from the main gear.

[0013] Furthermore, preferably, the reaming portion is provided with an arc surface and cooperates with the circumferential wall of the drill body.

[0014] Compared with the prior art, the present invention provides a new tapered drill bit for rotary drilling rigs, which has the following beneficial effects:

[0015] Advantage 1: The present invention changes the conventional drill bit into a conical drill bit. The tip of the conical end will drill into the mudstone layer in advance and form an air-facing surface. The bottom of the pile foundation hole is converted from a plane to a parabolic shape. Therefore, compared with the conventional drill bit, the contact area between the drill bit and the rock mass during the drilling process of the present invention is reduced, and the cross-sectional area of ​​the rock mass is also reduced accordingly. This overcomes the difficulties of conventional drill bits that are prone to slipping when encountering water in mudstone layers and have slow drilling speeds, improves construction efficiency, speeds up drilling speeds, reduces construction costs, and shortens the single pile drilling time from more than 15 days to less than 7 days.

[0016] Advantage 2: The present invention incorporates a cleaning assembly that performs three separate cleaning operations within the drill body. The combined cleaning effects of these three components completely clean the entire drill body, preventing drill cuttings from adhering to the inner wall of the drill body and being unable to be shaken off. This improves cleaning effectiveness without affecting subsequent drilling and removal efficiency.

[0017] Advantage 3: The present invention is equipped with a reaming assembly to achieve reaming operations of different sizes. The casing can be placed conveniently and quickly without manually adding reaming parts, and there is no need to prepare reaming parts of various sizes, which reduces operation costs, reduces operation processes, and improves operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a conical drill bit of a new rotary drilling rig;

[0019] Figure 2 This is a schematic diagram of the structure of a tapered drill bit assembly for a new rotary drilling rig;

[0020] Figure 3 This is a schematic diagram of the structure of a conical drill bit cleaning component of a new rotary drilling rig;

[0021] Figure 4 A new type of rotary drilling rig with a conical drill bit reaming assembly Figure 1 ;

[0022] Figure 5 A new type of rotary drilling rig with a conical drill bit reaming assembly Figure 2 ;

[0023] Figure 6 This is a schematic diagram of the rock cross section when the drill bit of a conventional rotary drilling rig is drilling;

[0024] Figure 7 This is a schematic diagram of the rock cross section when a new type of rotary drilling rig's conical drill bit is drilling;

[0025] In the figure: 1. Vehicle body; 2. Mast; 3. Drill rod; 4. Pressurizing device; 5. Mounting cavity; 6. Drill bit assembly; 611. Receiving port; 641. Support plate; 642. Driving member 1; 643. Rotating shaft; 644. Cleaning horizontal bar; 645. Cleaning vertical bar; 646. Cleaning oblique bar; 647. Arc scraper; 648. Cleaning block; 61. Drill bit body; 62. Conical end; 63. Drill tip; 64. Cleaning assembly; 65. Reaming assembly; 651. Base plate; 652. Driving member 2; 653. Main gear; 654. Sub gear; 655. Rotating shaft; 656. Reaming member; 6561. Reaming part; 7. Winch. DETAILED DESCRIPTION

[0026] See also Figure 1-Figure 7 The utility model provides a new type of conical drill bit for a rotary drilling rig, comprising: a vehicle body 1, a mast 2, a drill rod 3, a pressure device 4, a mounting cavity 5, a drill bit assembly 6, and a hoisting device 7, wherein the mast 2 is mounted on the vehicle body 1, the drill rod 3 is connected to the mast 2, one end of the drill rod 3 is connected to the pressure device 4, and the other end is connected to the hoisting device 7, the end of the pressure device 4 away from the drill rod 3 is connected to the mounting cavity 5, and the end of the mounting cavity 5 away from the pressure device 4 is connected to the drill bit assembly 6;

[0027] In this embodiment, the vehicle body 1 is first positioned and moved to the working area, and then the vehicle body 1 controls the mast 2 to swing and place the drill rod 3 in a vertical position to wait for the work to proceed. Then, the winch device 7 drives the drill rod 3, the pressurizing device 4, the installation cavity 5 and the drill bit assembly 6 in a vertical downward direction to start the drilling operation. After the drilling operation is completed, the various components return to their initial state, and the vehicle body 1 leaves the working area.

[0028] The drill bit assembly 6 includes: a drill bit body 61, a tapered end 62, a drill tip 63, a cleaning assembly 64 and a reaming assembly 65, wherein the drill bit body 61 is connected to the end of the mounting cavity 5 away from the pressurizing device 4, the drill bit body 61 is provided with the tapered end 62 at the end, and multiple groups of the drill tips 63 are installed on the tapered end 62, the cleaning assembly 64 is provided inside the drill bit body 61, and the reaming assembly 65 is installed on the drill bit body 61.

[0029] As a preferred embodiment, please refer to Figure 6 、 Figure 7 As shown, the cross-sectional area of ​​the rock mass when drilling with a conventional drill bit is as follows: Figure 6 As shown in the S1 area, the cross-sectional area of ​​the rock mass when the conical drill bit of the present invention is drilled is as follows: Figure 7As shown in the middle S2 area, the present invention provides a tapered end 62 on the drill bit body 61, so that the drill bit assembly 6 becomes a tapered drill bit. Due to the special shape of the tapered end 62, the tip of the tapered end 62 will drill into the mudstone layer in advance and form an air-facing surface, and the bottom of the pile foundation hole is converted from a plane to a parabolic shape. Therefore, compared with conventional drill bits, the contact area between the drill bit and the rock mass is reduced during the drilling process of the present invention, and the cross-sectional area of ​​the rock mass is also reduced accordingly. That is to say, S2 is less than S1, which overcomes the difficulties of conventional drill bits that are prone to slipping when encountering water in mudstone layers and have slow drilling speeds, improves construction efficiency, speeds up drilling speeds, reduces construction costs, and also shortens the single pile drilling time from more than 15 days to less than 7 days.

[0030] Furthermore, the cleaning assembly 64 includes: a support plate 641, a driving member 642, a rotary shaft 643 and a cleaning rod group. The support plate 641 is fixedly connected to the installation cavity 5. The driving member 642 is provided on the support plate 641. The output end of the driving member 642 is connected to the rotary shaft 643. The rotary shaft 643 can rotatably pass through the support plate 641 and the installation cavity 5 and extend to the inside of the drill bit body 61. The end of the rotary shaft 643 is connected to the cleaning rod group.

[0031] Furthermore, the cleaning rod group includes: a cleaning horizontal rod 644, a cleaning vertical rod 645 and a cleaning diagonal rod 646, wherein the cleaning horizontal rod 644 is configured into two groups, the two groups of cleaning horizontal rods 644 are cross-shaped and detachably connected to the end of the rotating shaft 643, the two ends of the two groups of cleaning horizontal rods 644 are detachably connected to the cleaning vertical rod 645, and the four groups of cleaning vertical rods 645 are fixedly connected to the cleaning diagonal rod 646 at one end away from the cleaning horizontal rod 644.

[0032] Furthermore, the top of the cleaning horizontal rod 644 can be slidably pressed against the top inner side of the drill body 61, and the four groups of cleaning vertical rods 645 are detachably connected to one side of an arc scraper 647, and the arc scraper 647 can be slidably pressed against the inner wall of the drill body 61 away from the side of the cleaning vertical rod 645. Cleaning blocks 648 are evenly distributed on the four groups of cleaning inclined rods 646, and the cleaning blocks 648 can be slidably pressed against the inner wall of the tapered end 62 at one end away from the cleaning inclined rod 646. The conical structure formed by the four groups of cleaning inclined rods 646 cooperates with the inner wall of the tapered end 62.

[0033] During the drilling operation, the rotary drilling rig needs to repeatedly remove the drill bit to perform the slag removal operation. Specifically, the slag removal operation is to rotate the drill bit back and forth slightly. However, during the drilling process, the viscosity of the mudstone layer increases when it comes into contact with water. Therefore, the above slag removal operation cannot completely remove the drilling debris inside the drill bit. The present invention provides a cleaning component 64 to assist in the slag removal operation. For details, please refer to Figure 3 As shown:

[0034] As a preferred embodiment, the driving member 642 is turned on, and the driving member 642 drives the rotating shaft 643 to rotate a full circle, and then the two groups of cleaning horizontal rods 644, the four groups of cleaning vertical rods 645 and the four groups of cleaning oblique rods 646 rotate a full circle synchronously.

[0035] During the rotation of the cleaning rod assembly, the two sets of cleaning horizontal rods 644 are arranged in a cross shape, thereby completely and comprehensively cleaning the drill cuttings in the top area of ​​the drill bit body 61. The arc scrapers 647 on the four sets of cleaning vertical rods 645 can scrape the drill cuttings from the inner circumferential wall of the drill bit body 61, and the cleaning blocks 648 on the four sets of cleaning angle rods 646 can clean the drill cuttings from the inner conical wall of the tapered end 62. The present invention can perform the above three independent cleaning operations on the interior of the drill bit body 61. The combined cleaning effects of these three components can completely clean the entire interior of the drill bit body 61, preventing drill cuttings from adhering to the inner wall of the drill bit body 61 and being unable to be shaken off. This improves the cleaning effect without affecting the subsequent drilling efficiency and slag removal efficiency.

[0036] It should be noted that the conical structure formed by the four sets of cleaning rods 646 can perfectly match the inner conical wall of the tapered end 62, so there will be no interference when cleaning the inner conical wall. After completing the drilling operation, the cleaning rod set of the present invention can be disassembled for cleaning and reinstalled for continued use.

[0037] Furthermore, the reaming assembly 65 includes: a base plate 651, a second driving member 652, a main gear 653, a sub-gear 654 and a rotating shaft 655, wherein the base plate 651 is fixedly connected to the side of the support plate 641 close to the pressure device 4 in the installation cavity 5, the second driving member 652 is provided at the center of the base plate 651, the output end of the second driving member 652 is connected to the main gear 653, five groups of sub-gears 654 are arranged on the circumference of the base plate 651, the five groups of sub-gears 654 are semi-circular teeth, the five groups of sub-gears 654 are respectively meshed with the main gear 653, and the output ends of the five groups of sub-gears 654 are respectively fixedly connected to the rotating shaft 655, and the rotating shaft 655 can rotatably pass through the base plate 651, the support plate 641 and the installation cavity 5 and extend to the peripheral wall of the drill body 61.

[0038] Furthermore, five groups of accommodating openings 611 are opened on the circumference of the drill body 61, and the five groups of accommodating openings 611 correspond to the positions of the five groups of rotating shafts 655 respectively. The five groups of rotating shafts 655 are respectively fixedly sleeved with expansion pieces 656 at the positions of the accommodating openings 611.

[0039] During the operation of the rotary drilling rig, it is necessary to perform hole enlarging operation to place the casing. The present invention provides a hole enlarging assembly 65 to achieve the hole enlarging operation of different sizes. The casing can be placed conveniently and quickly without manually adding the hole enlarging piece, and there is no need to prepare hole enlarging pieces of various sizes, which reduces the operation cost, reduces the operation process, and improves the operation efficiency. For details, please refer to Figure 4 、 Figure 5 As shown:

[0040] As a preferred embodiment, when the reaming operation is required, the second driving member 652 is started, and the second driving member 652 will drive the main gear 653 to rotate, and the five sets of sub-gears 654 are driven to rotate synchronously by means of the meshing relationship. The five sets of sub-gears 654 respectively drive the rotating shafts 655 and the reaming members 656 thereon to rotate, and the five sets of reaming members 656 will respectively rotate out of the receiving openings 611 where they are located, and the reaming assembly 65 enters the reaming state (as shown in FIG. Figure 5 The hole enlarging operation is completed.

[0041] It should be noted that the degree to which the reaming member 656 rotates out of the accommodating opening 611 can be controlled to meet the needs of reaming holes of different sizes. That is to say, for example, when the reaming member 656 is slightly rotated out of the accommodating opening 611, the need for reaming holes of smaller sizes can be met. When the reaming member 656 is completely rotated out of the accommodating opening 611, the need for reaming holes of larger sizes can be met. However, there is an upper limit to the degree to which the reaming member 656 can be rotated out, and this upper limit is determined by the tooth on the outermost side of the sub-gear 654 (hereinafter referred to as the upper limit tooth). That is to say, the maximum extent to which the sub-gear 654 can rotate is the extent to which the upper limit tooth thereon is close to the inner wall of the mounting cavity 5 (such as Figure 5 As shown at point P in the middle, the expansion member 656 is now completely rotated out of the accommodating opening 611).

[0042] Furthermore, a reaming portion 6561 is provided at one end of the reaming member 656 away from the main gear 653 .

[0043] Furthermore, the reaming portion 6561 is configured as an arc surface and matches the circumferential wall of the drill body 61 .

[0044] In this embodiment, the reaming portion 6561 is provided with an arc surface, that is, when the reaming assembly 65 is in a non-reaming state (such as Figure 4 As shown), the five sets of reaming members 656 will be completely rotated into the corresponding accommodating openings 611, and form a smooth and complete circumferential wall with the outer wall of the drill body 61, which will not affect the drilling operation in the non-reaming stage.

[0045] During specific implementation, the vehicle body 1 is first positioned and moved to the working area. Then, the vehicle body 1 controls the mast 2 to be raised and lowered to place the drill rod 3 in a vertical position to wait for the work to proceed. Then, the winch device 7 drives the drill rod 3, the pressurizing device 4, the installation cavity 5 and the drill bit assembly 6 downward in the vertical direction to start the drilling operation. After the drilling operation is completed, the various components return to their initial state and the vehicle body 1 leaves the working area.

[0046] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of conical drill bit for rotary drilling rig, characterized by: include: A vehicle body (1), a mast (2), a drill rod (3), a pressurizing device (4), a mounting cavity (5), a drill bit assembly (6), and a hoisting device (7), wherein the vehicle body (1) is mounted with the mast (2), the drill rod (3) is connected to the mast (2), one end of the drill rod (3) is connected to the pressurizing device (4), and the other end is connected to the hoisting device (7), the end of the pressurizing device (4) away from the drill rod (3) is connected to the mounting cavity (5), and the end of the mounting cavity (5) away from the pressurizing device (4) is connected to the drill bit assembly (6); The drill bit assembly (6) comprises: a drill bit body (61), a tapered end (62), a drill tip (63), a cleaning assembly (64) and a reaming assembly (65), wherein the drill bit body (61) is connected to an end of the mounting cavity (5) away from the pressurizing device (4), the tapered end (62) is provided at the end of the drill bit body (61), a plurality of groups of the drill tips (63) are installed on the tapered end (62), a cleaning assembly (64) is provided inside the drill bit body (61), and the reaming assembly (65) is installed on the drill bit body (61).

2. The tapered drill bit of the new rotary drilling rig according to claim 1 is characterized in that: The cleaning assembly (64) comprises: a support disc (641), a driving member (642), a rotary shaft (643) and a cleaning rod group. The support disc (641) is fixedly connected to the installation cavity (5). The driving member (642) is provided on the support disc (641). The output end of the driving member (642) is connected to the rotary shaft (643). The rotary shaft (643) can rotatably pass through the support disc (641) and the installation cavity (5) and extend to the interior of the drill bit body (61). The end of the rotary shaft (643) is connected to the cleaning rod group.

3. The tapered drill bit of the new rotary drilling rig according to claim 2 is characterized in that: The cleaning rod group comprises: a cleaning horizontal rod (644), a cleaning vertical rod (645) and a cleaning oblique rod (646), wherein the cleaning horizontal rod (644) is configured into two groups, the two groups of cleaning horizontal rods (644) are cross-shaped and detachably connected to the end of the rotating shaft (643), the two ends of the two groups of cleaning horizontal rods (644) are detachably connected to the cleaning vertical rod (645), and the ends of the four groups of cleaning vertical rods (645) away from the cleaning horizontal rod (644) are fixedly connected to the cleaning oblique rod (646).

4. The tapered drill bit of the new rotary drilling rig according to claim 3 is characterized in that: The top of the cleaning horizontal rod (644) can slide against the top of the inner part of the drill body (61); one side of the four groups of cleaning vertical rods (645) can be detachably connected with an arc scraper (647); the side of the arc scraper (647) away from the cleaning vertical rod (645) can slide against the inner wall of the drill body (61); cleaning blocks (648) are evenly distributed on the four groups of cleaning inclined rods (646); the end of the cleaning block (648) away from the cleaning inclined rod (646) can slide against the inner wall of the tapered end (62); the tapered structure formed by the four groups of cleaning inclined rods (646) cooperates with the inner wall of the tapered end (62).

5. The tapered drill bit of the new rotary drilling rig according to claim 2 is characterized in that: The reaming assembly (65) includes: a base plate (651), a second driving member (652), a main gear (653), a secondary gear (654) and a rotating shaft (655), wherein the base plate (651) is fixedly connected to the side of the support plate (641) close to the pressurizing device (4) in the installation cavity (5), the second driving member (652) is provided at the center of the base plate (651), the output end of the second driving member (652) is connected to the main gear (653), and the Five groups of auxiliary gears (654) are arranged on the circumference of the base plate (651). The five groups of auxiliary gears (654) are semicircular gear arrangements. The five groups of auxiliary gears (654) are respectively engaged with the main gear (653). The output ends of the five groups of auxiliary gears (654) are respectively fixedly connected to the rotating shaft (655). The rotating shaft (655) can rotatably pass through the base plate (651), the support plate (641) and the mounting cavity (5) and extend into the peripheral wall of the drill bit body (61).

6. The tapered drill bit of the new rotary drilling rig according to claim 5, characterized in that: Five groups of accommodating openings (611) are provided on the circumference of the drill bit body (61), and the five groups of accommodating openings (611) correspond to the positions of the five groups of rotating shafts (655). Hole-expanding pieces (656) are fixedly sleeved at the positions of the accommodating openings (611) on the five groups of rotating shafts (655).

7. The tapered drill bit of the new rotary drilling rig according to claim 6, characterized in that: An expansion portion (6561) is provided at one end of the expansion member (656) away from the main gear (653).

8. The tapered drill bit of the new rotary drilling rig according to claim 7, characterized in that: The reaming portion (6561) is provided with an arc surface and matches the circumferential wall of the drill bit body (61).

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