A drill bit for reverse circulation drilling of bored piles

Abstract

This utility model discloses a drill bit for reverse circulation drilling of bored piles, relating to the field of drill bit technology. The utility model includes a delivery pipe with a circular ring fitted around its exterior. Three evenly distributed connecting rods are fixedly installed on the outer wall of the delivery pipe. The end of each connecting rod furthest from the delivery pipe is fixedly connected to the inner wall of the circular ring, and a diagonal rod is fixedly installed at the bottom of each connecting rod. This utility model uses the delivery pipe to draw in mud and drill cuttings from inside the hole, allowing the mud and cuttings inside the hole to be discharged. To prevent the delivery pipe from being clogged by excessively large drill cuttings, the position of each strip frame can be adjusted left or right as needed, and the position of each crossbar can be adjusted forward or backward as needed. The crossbars and strip frames together form a filter screen, filtering out excessively large drill cuttings and preventing them from entering the delivery pipe, ensuring the normal discharge of the remaining mud and drilling cuttings from the hole.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, specifically to a drill bit for drilling holes in a reverse circulation drilling rig for bored piles. Background Technology

[0002] The drill bits used in reverse circulation drilling rigs for bored piles come in various types depending on their design and the applicable geological formations. In reverse circulation drilling rigs, the main function of the drill bit is to cut or break up the formation material and then use the reverse circulation system to bring the cuttings or debris from the bottom of the hole to the surface. Common reverse circulation drilling rig drill bits include, but are not limited to, auger bits, roller cone bits, scraper bits, combination bits, and specialized drill bits.

[0003] However, the drill bits used in existing reverse circulation drilling rigs cannot filter out large-volume stones in time when transporting the bottom stones to the surface. This can easily cause large-volume stones to clog the reverse circulation transmission pipes, thus affecting the smooth circulation of the flushing fluid, reducing the crushing efficiency of the drill bit, and consequently reducing the overall drilling speed. Therefore, a new drill bit for drilling and grouting pile reverse circulation drilling rigs is proposed. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that the drill bit used in the existing reverse circulation drilling machine cannot filter out the large-volume gravel in time when transporting the gravel from the bottom of the hole to the surface. This utility model provides a drill bit for drilling holes in a reverse circulation drilling machine for bored piles.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A drill bit for reverse circulation drilling of bored piles includes a delivery pipe with a circular ring fitted around its outer surface. Three evenly distributed connecting rods are fixedly installed on the outer wall of the delivery pipe. The end of each connecting rod away from the delivery pipe is fixedly connected to the inner wall of the circular ring. A diagonal rod is fixedly installed at the bottom of each connecting rod, and the end of each diagonal rod away from the connecting rod is fixedly connected to the outer wall of the delivery pipe. Several equally spaced drill teeth are fixedly installed on the side of each diagonal rod away from the delivery pipe. Two symmetrically distributed mounting plates are fixedly installed on the outer wall of the delivery pipe. A U-shaped frame is fixedly connected to the two mounting plates at the lower end of the delivery pipe. Several evenly distributed drill teeth are fixedly installed on the outer wall of the U-shaped frame. A detachable rectangular frame is set inside the U-shaped frame. Several horizontally movable strip frames are set inside the rectangular frame. Several horizontally placed crossbars are set inside the rectangular frame, and each crossbar passes through the interior of all the strip frames.

[0007] Furthermore, each of the front and rear walls of the rectangular frame has a strip-shaped hole, and each end of each strip-shaped frame has a block fixedly installed. Each block is movably installed inside the adjacent strip-shaped hole. Each strip-shaped hole has an elongated hole at its bottom, and each block has a threaded rod that passes through the adjacent elongated hole fixedly installed at its bottom. Each threaded rod is threaded with a nut.

[0008] Furthermore, the left and right walls of the rectangular frame are provided with strip-shaped holes II, and each end of each crossbar is fixedly installed with a block II. Each block II is movably installed inside the adjacent strip-shaped holes II. Each strip-shaped hole II is provided with an elongated hole II at its bottom. Each block II is fixedly installed with a threaded rod II that passes through the adjacent elongated hole II at its bottom. Each threaded rod II is threaded with a nut II.

[0009] Furthermore, the two symmetrical side walls inside the U-shaped frame are respectively provided with mounting grooves, and the left and right outer walls of the rectangular frame are respectively fixedly installed with mounting blocks. The two mounting blocks are respectively movably installed inside the two mounting grooves. The top of each mounting block is provided with a threaded groove, and the inside of each mounting plate is threaded with bolts. The tail ends of the two bolts are respectively threaded into the inside of the two threaded grooves.

[0010] Furthermore, a limiting groove is provided on the side of each of the two mounting grooves that are far apart from each other, and a limiting block is fixedly installed on the side of each of the two mounting blocks that are far apart from each other. The two limiting blocks are movably installed inside the two limiting grooves respectively.

[0011] Furthermore, the inner bottom surface of the strip frame is arranged in an inverted V shape, and the inner bottom surface of the strip frame is arranged with a high center and low sides.

[0012] The beneficial effects of this utility model are as follows:

[0013] This utility model of reverse circulation drilling rig uses a drive device to rotate the drill bit to drill a hole in the ground. At the same time, mud is injected into the hole, and the mud and drill cuttings inside the hole are sucked in through the delivery pipe, allowing the mud and drill cuttings inside the hole to be discharged. To prevent the delivery pipe from being blocked by excessively large drill cuttings, the position of each strip frame can be adjusted to the left or right as needed, and the position of each crossbar can be adjusted forward or backward as needed. The crossbars and strip frames together form a filter screen, thereby filtering out excessively large drill cuttings and preventing them from entering the delivery pipe, ensuring that the remaining mud and drill cuttings in the hole are discharged normally. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is an exploded view of the internal structure of the rectangular frame of this utility model;

[0016] Figure 3 This is a detailed schematic diagram of the internal structure of the U-shaped frame of this utility model;

[0017] Reference numerals: 1. Conveying pipe; 2. Ring; 3. Connecting rod; 4. Diagonal rod; 5. Drill tooth one; 6. Mounting plate; 7. U-shaped frame; 8. Drill tooth two; 9. Rectangular frame; 10. Strip frame; 11. Crossbar; 12. Strip hole one; 13. Block one; 14. Long strip hole one; 15. Lead screw one; 16. Nut one; 17. Strip hole two; 18. Block two; 19. Long strip hole two; 20. Lead screw two; 21. Nut two; 22. Mounting groove; 23. Mounting block; 24. Threaded groove; 25. Bolt; 26. Limiting groove; 27. Limiting block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1 to 3As shown, a drill bit for reverse circulation drilling of bored piles includes a delivery pipe 1, with a circular ring 2 sleeved on the outside of the delivery pipe 1. Three evenly distributed connecting rods 3 are fixedly installed on the outer wall of the delivery pipe 1. The end of each connecting rod 3 away from the delivery pipe 1 is fixedly connected to the inner wall of the circular ring 2. An inclined rod 4 is fixedly installed at the bottom of each connecting rod 3. The end of each inclined rod 4 away from the connecting rod 3 is fixedly connected to the outer wall of the delivery pipe 1. Several equally spaced drill teeth 5 are fixedly installed on the side of each inclined rod 4 away from the delivery pipe 1. Two symmetrically distributed mounting plates 6 are fixedly installed on the outer wall of the delivery pipe 1. A U-shaped frame 7 is provided at the lower end of the delivery pipe 1 and fixedly connected to the two mounting plates 6. Several evenly distributed drill teeth 8 are fixedly installed on the outer wall of the U-shaped frame 7. A detachable rectangular frame 9 is provided inside the U-shaped frame 7. The system comprises several movable strip frames 10, and rectangular frames 9 containing several horizontally placed crossbars 11. Each crossbar 11 extends through the interior of all the strip frames 10. It should be noted that the reverse circulation drilling rig uses a drive unit to rotate the drill bit and drill a hole in the ground. Simultaneously, mud is injected into the hole, and the mud and drill cuttings are drawn in through the delivery pipe 1, allowing the mud and drill cuttings to be discharged. To prevent excessively large drill cuttings from being drawn into the delivery pipe 1 and causing blockage, the position of each strip frame 10 can be adjusted to the left or right as needed, and the position of each crossbar 11 can be adjusted forward or backward as needed. The crossbars 11 and strip frames 10 together form a filter screen, filtering out excessively large drill cuttings and preventing them from entering the delivery pipe 1, ensuring the normal discharge of the remaining mud and drill cuttings from the hole.

[0023] like Figure 1 , Figure 2 As shown, the front and rear walls of the rectangular frame 9 are provided with strip-shaped holes 12. Each strip frame 10 has a block 13 fixedly installed at both ends. Each block 13 is movably installed inside the adjacent strip-shaped hole 12. Each strip-shaped hole 12 has an elongated hole 14 at its bottom. Each block 13 has a threaded rod 15 that passes through the adjacent elongated hole 14. Each threaded rod 15 is threaded with a nut 16. It should be noted that moving each strip frame 10 to the left or right will cause the two blocks 13 connected to it to slide inside the corresponding strip-shaped hole 12. The movement of each block 13 will also cause the threaded rod 15 connected to it to move synchronously. When the strip frame 10 moves to the correct position, the corresponding nut 16 can be rotated to complete the fixation. The operator can adjust the distance between each pair of adjacent strip frames 10 as needed to adapt to filtering drill cuttings of different sizes.

[0024] like Figure 1 , Figure 2As shown, the left and right walls of the rectangular frame 9 are provided with strip-shaped holes 17. Each horizontal bar 11 has a block 18 fixedly installed at both ends. Each block 18 is movably installed inside the adjacent strip-shaped hole 17. Each strip-shaped hole 17 has a long hole 19 at its bottom. Each block 18 has a threaded rod 20 that passes through the adjacent long hole 19. Each threaded rod 20 is threaded with a nut 21. It should be noted that moving each horizontal bar 11 forward or backward will cause the two blocks 18 connected to it to slide inside the corresponding strip-shaped hole 17. The movement of each block 18 will cause the threaded rod 20 connected to it to move synchronously. When the horizontal bar 11 moves to the correct position, the corresponding nut 21 can be rotated to complete the fixation. The operator can adjust the distance between each pair of adjacent horizontal bars 11 as needed to adapt to filtering drill cuttings of different sizes.

[0025] like Figures 1 to 3 As shown, the two symmetrical side walls inside the U-shaped frame 7 are provided with mounting grooves 22. Mounting blocks 23 are fixedly installed on the left and right outer walls of the rectangular frame 9. The two mounting blocks 23 are movably installed inside the two mounting grooves 22. Each mounting block 23 has a threaded groove 24 on its top. Each mounting plate 6 has a bolt 25 threaded inside. The tail ends of the two bolts 25 are threaded into the two threaded grooves 24. It should be noted that by rotating the two bolts 25, the tail ends of the two bolts 25 can be rotated out from the corresponding threaded grooves 24, and the two mounting blocks 23 can be removed from the corresponding mounting grooves 22, thus completing the disassembly of the rectangular frame 9. Reinstallation can be selected as needed.

[0026] like Figures 1 to 3 As shown, limit grooves 26 are respectively opened on the side of the two mounting slots 22 that are far apart from each other, and limit blocks 27 are fixedly installed on the side of the two mounting blocks 23 that are far apart from each other. The two limit blocks 27 are respectively movably installed inside the two limit grooves 26. It should be noted that when the two mounting blocks 23 are respectively movably installed inside the two mounting slots 22, each bolt 25 is movably installed inside the corresponding limit groove 26, the purpose of which is to effectively position and install the rectangular frame 9.

[0027] like Figure 2 As shown, the inner bottom surface of the strip frame 10 is set in an inverted V shape, and the inner bottom surface of the strip frame 10 is set with a high center and low sides. It should be noted that the inner bottom surface of the strip frame 10 is set in an inverted V shape, which can prevent drill cuttings from accumulating on the inner bottom surface of the strip frame 10.

[0028] In summary:

[0029] The reverse circulation drilling rig drives the drill bit of this technical solution to rotate and drill a hole in the ground. At the same time, it injects mud into the hole and sucks in the mud and drill cuttings inside the hole through the delivery pipe 1, so that the mud and drill cuttings inside the hole can be discharged. In order to avoid the blockage caused by the intake of excessively large drill cuttings into the delivery pipe 1, the position of each strip frame 10 can be adjusted to the left or right as needed, and the position of each crossbar 11 can be adjusted forward or backward as needed. The crossbar 11 and the strip frame 10 together form a filter screen, thereby filtering out the excessively large drill cuttings and preventing them from entering the interior of the delivery pipe 1, so as to ensure that the remaining mud and drill cuttings in the hole can be discharged normally.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drill bit for reverse circulation drilling of bored piles, characterized in that, The system includes a conveying pipe (1), with a ring (2) fitted around its exterior. Three evenly distributed connecting rods (3) are fixedly installed on the outer wall of the conveying pipe (1). The end of each connecting rod (3) furthest from the conveying pipe (1) is fixedly connected to the inner wall of the ring (2). A diagonal rod (4) is fixedly installed at the bottom of each connecting rod (3). The end of each diagonal rod (4) furthest from the connecting rod (3) is fixedly connected to the outer wall of the conveying pipe (1). Several equally spaced drill teeth (5) are fixedly installed on the side of each diagonal rod (4) facing away from the conveying pipe (1). (1) Two symmetrically distributed mounting plates (6) are fixedly installed on the outer wall. The lower end of the conveying pipe (1) is provided with a U-shaped frame (7) fixedly connected to the two mounting plates (6). Several evenly distributed drill teeth (8) are fixedly installed on the outer wall of the U-shaped frame (7). A detachable rectangular frame (9) is provided inside the U-shaped frame (7). Several horizontally movable strip frames (10) are provided inside the rectangular frame (9). Several horizontally placed crossbars (11) are provided inside the rectangular frame (9). Each crossbar (11) passes through the interior of all the strip frames (10).

2. The drill bit for reverse circulation drilling of bored piles according to claim 1, characterized in that, The rectangular frame (9) has a strip hole (12) on both the front and back walls. A block (13) is fixedly installed at both ends of each strip frame (10). Each block (13) is movably installed inside the adjacent strip hole (12). A long strip hole (14) is opened at the bottom of each strip hole (12). A threaded rod (15) that passes through the adjacent long strip hole (14) is fixedly installed at the bottom of each block (13). A nut (16) is threaded onto each threaded rod (15).

3. The drill bit for reverse circulation drilling of bored piles according to claim 1, characterized in that, The rectangular frame (9) has two strip holes (17) on its left and right walls. Two blocks (18) are fixedly installed at both ends of each crossbar (11). Each block (18) is movably installed inside the adjacent strip hole (17). Each strip hole (17) has a long strip hole (19) at its bottom. Each block (18) has a threaded rod (20) that passes through the adjacent long strip hole (19) at its bottom. Each threaded rod (20) is threaded with a nut (21).

4. The drill bit for reverse circulation drilling of bored piles according to claim 1, characterized in that, The U-shaped frame (7) has mounting grooves (22) on its two symmetrical inner walls. The rectangular frame (9) has mounting blocks (23) fixedly installed on its left and right outer walls. The two mounting blocks (23) are movably installed inside the two mounting grooves (22). Each mounting block (23) has a threaded groove (24) on its top. Each mounting plate (6) has a bolt (25) threaded inside. The tail ends of the two bolts (25) are threaded into the two threaded grooves (24).

5. The drill bit for reverse circulation drilling of bored piles according to claim 4, characterized in that, Limiting grooves (26) are respectively opened on the side of the two mounting grooves (22) that are far apart from each other, and limiting blocks (27) are fixedly installed on the side of the two mounting blocks (23) that are far apart from each other. The two limiting blocks (27) are respectively movably installed inside the two limiting grooves (26).

6. The drill bit for reverse circulation drilling of bored piles according to claim 1, characterized in that, The inner bottom surface of the strip frame (10) is set in an inverted V shape, and the inner bottom surface of the strip frame (10) is set with the middle being high and the two sides being low.

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