Adjustable rotary excavating drill bit

Abstract

The adjustable rotary excavating drill bit comprises a drill bit body, movable frames and a rotary disc, the bottom of the drill bit body is open, a movable door is arranged at the bottom of the drill bit body in a hinged mode, a plurality of drill teeth are arranged at the bottom of the movable door at intervals, and the movable frames are arranged outside the drill bit body in the circumferential direction of the drill bit body at intervals. One end of each movable frame is rotationally connected with the drill bit body, the top of the other end of each movable frame is rotationally connected with a connecting rod, a plurality of drill teeth are fixedly arranged at the bottom of each movable frame at intervals, the rotary disc is rotationally arranged at the top of the drill bit body in the axial direction of the drill bit body, and the end of each connecting rod is eccentrically and rotationally connected with the rotary disc. And the turntable is connected with the drill bit body through a locking mechanism. Through the arrangement, the device can excavate pile holes with various diameters, the operation steps are simplified, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of construction engineering equipment technology, specifically relating to an adjustable rotary drilling bit. Background Technology

[0002] A rotary drilling bit is a component on a rotary drilling rig used for drilling operations. Rotary drilling bits are typically barrel-shaped with an openable / closable door at the bottom. While breaking up rock and soil, the rotary drilling bit loads the broken rock and soil into itself. After loading, the bit is lifted out by the drilling rig's hoisting device for unloading. Construction projects commonly require excavating pile holes of various diameters. Current technologies generally require preparing drill bits of various diameters, resulting in higher construction costs.

[0003] Chinese patent CN210509056U discloses an adjustable diameter rotary drilling rig drill bit. This design includes a rotating rod, with a connecting plate fixedly connected to its lower end. A drill bit is fixedly mounted on the lower end of the connecting plate, and a connecting column is fixedly connected to its lower end. Hydraulic cylinders are fixedly connected to the four side walls of a connecting block at the lower end of the connecting column. One end of each hydraulic cylinder passes through the side wall of the drill bit. A first expansion plate is fixedly mounted on one end of each hydraulic cylinder, and a second expansion plate is positioned between two adjacent first expansion plates. This design achieves the purpose of changing the drill bit diameter by placing multiple second expansion plates between two adjacent first expansion plates.

[0004] When using the above solution, in order to adjust the drill bit to multiple different diameters, it is necessary to prepare first and second expansion plates with various curvatures, which results in high cost. Furthermore, when adjusting the drill bit diameter, the first and second expansion plates need to be replaced, resulting in low work efficiency when adjusting the drill bit diameter. Utility Model Content

[0005] The present invention aims to provide an adjustable rotary drilling bit to solve the problems of high cost and low work efficiency of the above-mentioned solutions.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An adjustable rotary drilling bit includes a drill bit body, a movable frame, and a rotary table. The bottom of the drill bit body is open, and a movable door is hinged to the bottom of the drill bit body. Multiple drill teeth are spaced apart at the bottom of the movable door. Multiple sets of movable frames are spaced apart outside the drill bit body along the circumference of the drill bit body. One end of each movable frame is rotatably connected to the drill bit body, and a connecting rod is rotatably connected to the top of the other end of the movable frame. Multiple drill teeth are fixedly spaced at the bottom of the movable frame. The rotary table is rotatably mounted on the top of the drill bit body along the axial direction of the drill bit body. The ends of each connecting rod are eccentrically rotatably connected to the rotary table. The rotary table and the drill bit body are connected by a locking mechanism.

[0008] The principle and effects of this technical solution:

[0009] In the initial state, the other end of each movable frame is close to the drill bit body. When it is necessary to adjust the excavation diameter of the drill bit, the locking mechanism is released and the turntable is rotated. During the rotation of the turntable, each movable frame will be pushed to rotate through the connecting rod. After each movable frame is rotated to the appropriate position, the locking mechanism is closed to prevent the turntable from continuing to rotate relative to the drill bit body. During the rotation of the movable frame with the drill bit body, the drill teeth at the bottom of the movable frame excavate the soil base outside the drill bit body.

[0010] With the above setup, the movable frame can be rotated by rotating the turntable, which can adjust the distance between the other end of the movable frame and the axis of the drill bit body. The turntable is then locked by a locking mechanism to prevent the movable frame from continuing to rotate during the excavation process. This allows the device to excavate pile holes of various diameters, simplifies the operation steps, improves work efficiency, and eliminates the need for additional replacement parts of other sizes, thus reducing production costs.

[0011] In this utility model, the top of the turntable is provided with a through hole, and the top of the drill bit body is provided with a plurality of first insertion holes that can be aligned with the through hole at intervals along the circumference. The locking mechanism includes a pin, which can slide through the through hole and the corresponding first insertion hole.

[0012] The principle and effects of this technical solution:

[0013] Rotate the turntable according to the size of the pile hole to be excavated, so that the through hole on the turntable is aligned with the corresponding first insertion hole, and then pass the pin through the through hole and the first insertion hole aligned with the through hole from above the turntable.

[0014] With the above settings, the turntable can be prevented from continuing to rotate after it has been rotated to the appropriate position, thereby preventing the movable frame from rotating during the excavation process and ensuring the hole-forming quality of this device.

[0015] In this utility model, the two ends of the movable frame each have a vertically arranged round rod. The side wall of the drill bit body is provided with multiple through mounting grooves spaced apart circumferentially. A sleeve is rotatably installed in each mounting groove. A through screw hole is provided on the side wall of the sleeve. A limiting rod is rotatably fitted on the bottom of the round rod at the other end of the movable frame. The limiting rod slides through the sleeve. Multiple second insertion holes that can be aligned with the screw holes are spaced apart on the side wall of the limiting rod. A threaded rod is threaded through each screw hole.

[0016] The principle and effects of this technical solution:

[0017] In the initial state, each of the limiting rods is slidably inserted into the corresponding sleeve. When the through hole is aligned with one of the first insertion holes on the top of the drill bit body, the screw hole on each sleeve is aligned with one of the second insertion holes on the corresponding limiting rod. The threaded rod is threaded into the screw hole, and the end of the threaded rod is slidably inserted into the second through hole aligned with the screw hole.

[0018] The above-mentioned settings increase the constraint on the bottom of the movable frame, preventing it from twisting and deforming during excavation, thus improving the stability of the device during excavation and extending its service life.

[0019] In this invention, the sidewall of the drill bit body is provided with multiple through slots spaced apart circumferentially.

[0020] In this utility model, a baffle is fitted around the two round rods of each of the movable frames.

[0021] The principle and effects of this technical solution:

[0022] After the rock and soil on the outside of the drill bit body are broken by the drill teeth at the bottom of the movable frame, they move towards the through slot relative to the drill bit body. The baffle collects the broken rock and soil and pushes it into the drill bit body through the through slot.

[0023] The above-mentioned setup enables the device to collect fractured rock and soil on the outside of the drill bit body, thereby improving the cleaning efficiency of waste soil inside the pile hole.

[0024] In this invention, the cross-section of the baffle is arc-shaped. This design prevents the other end of the movable frame from being unable to get close to the drill bit body due to the baffle abutting against the outer wall of the drill bit body.

[0025] In this invention, a limiting block is fixedly provided at the top of the pin. This design prevents the pin from sliding downwards, improving the stability of the device during operation. Attached Figure Description

[0026] Figure 1 This is an isometric view of the overall structure of this utility model;

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 Disassembly of the components of this utility model Figure 1 ;

[0029] Figure 4 Disassembly of the components of this utility model Figure 2 . Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0031] The reference numerals in the accompanying drawings include: 10, drill bit body; 11, movable door; 12, first insertion hole; 13, mounting groove; 14, through groove; 20, drill teeth; 30, movable frame; 31, round rod; 32, baffle; 40, connecting rod; 50, turntable; 51, through hole; 60, pin; 61, limit block; 70, sleeve; 71, screw hole; 72, threaded rod; 80, limit rod; 81, second insertion hole.

[0032] Example:

[0033] As attached Figure 1-4 As shown, this utility model discloses an adjustable rotary drilling bit, including a drill bit body 10, a movable frame 30, and a turntable 50. The bottom of the drill bit body 10 is open, and a movable door 11 is hinged to the bottom of the drill bit body 10. Multiple drill teeth 20 are spaced apart at the bottom of the movable door 11. Multiple sets of movable frames 30 are spaced apart around the drill bit body 10. One end of each movable frame 30 is rotatably connected to the drill bit body 10, and the top of the other end of each movable frame 30 is rotatably connected to a connecting rod 40. Multiple drill teeth 20 are fixedly spaced apart at the bottom of the movable frame 30. The turntable 50 is rotatably mounted on the top of the drill bit body 10 along the axial direction of the drill bit body 10. The ends of each connecting rod 40 are eccentrically rotatably connected to the turntable 50. The turntable 50 is connected to the drill bit body 10 through a locking mechanism. The rotatable connection points of each connecting rod 40 and the turntable 50 are spaced apart from the axis of the turntable 50.

[0034] In this embodiment, the top of the turntable 50 is provided with a through hole 51, and the top of the drill bit body 10 is provided with a plurality of first insertion holes 12 that can be aligned with the through hole 51 at intervals along the circumference. The locking mechanism includes a pin 60, which can slide through the through hole 51 and the corresponding first insertion hole 12.

[0035] In this embodiment, the movable frame 30 has vertically arranged round rods 31 at both ends. The side wall of the drill bit body 10 is provided with a plurality of through mounting grooves 13 spaced apart circumferentially. Each mounting groove 13 is rotatably provided with a sleeve 70. The side wall of the sleeve 70 is provided with a through screw hole 71. The bottom of the round rod 31 at the other end of the movable frame 30 is rotatably fitted with a limiting rod 80. The limiting rod 80 slides through the sleeve 70. The side wall of the limiting rod 80 is provided with a plurality of second insertion holes 81 that can be aligned with the screw holes 71. Each screw hole 71 is threaded with a threaded rod 72. The upper and lower ends of the round rod 31 are located on the upper and lower sides of the drill bit body 10, respectively.

[0036] In this embodiment, the sidewall of the drill bit body 10 is provided with a plurality of through slots 14 spaced apart along the circumference.

[0037] In this embodiment, a baffle 32 is fitted around the two round rods 31 of each of the movable frames 30.

[0038] In this embodiment, the cross-section of the baffle 32 is arc-shaped.

[0039] In this embodiment, a limiting block 61 is fixedly provided on the top of the pin 60, and the bottom of the limiting block 61 can abut against the top of the turntable 50.

[0040] The specific implementation process is as follows:

[0041] In the initial state, the other end of each movable frame 30 is close to the drill bit body 10. When it is necessary to adjust the excavation diameter of the drill bit, the locking mechanism is released and the turntable 50 is rotated. During the rotation of the turntable 50, the movable frames 30 will be pushed to rotate through the connecting rod 40. After the movable frames 30 are rotated to the appropriate position, the locking mechanism is closed to prevent the turntable 50 from continuing to rotate relative to the drill bit body 10. During the rotation of the movable frame 30 with the drill bit body 10, the drill teeth 20 at the bottom of the movable frame 30 excavate the soil base outside the drill bit body 10.

[0042] Rotate the turntable 50 according to the size of the pile hole to be excavated, so that the through hole 51 on the turntable 50 is aligned with the corresponding first insertion hole 12, and then pass the pin 60 through the through hole 51 and the first insertion hole 12 aligned with the through hole 51 from above the turntable 50.

[0043] In the initial state, each of the limiting rods 80 is slidably inserted into the corresponding sleeve 70. When the through hole 51 is aligned with one of the first insertion holes 12 on the top of the drill bit body 10, the screw holes 71 on each sleeve 70 are aligned with one of the second insertion holes 81 on the corresponding limiting rod 80. The threaded rod 72 is threaded into the screw hole 71, and the end of the threaded rod 72 is slidably inserted into the second through hole 51 aligned with the screw hole 71.

[0044] After the rock and soil outside the drill bit body 10 are broken by the drill teeth 20 at the bottom of the movable frame 30, they move towards the through slot 14 relative to the drill bit body 10. The baffle 32 collects the broken rock and soil and pushes it into the drill bit body 10 through the through slot 14.

[0045] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An adjustable rotary drilling bit, characterized in that, include: The drill bit body has an open bottom and a hinged door at the bottom, with multiple drill teeth spaced apart at the bottom of the door. The movable frame is provided in multiple sets at intervals along the circumference of the drill bit body. One end of each movable frame is rotatably connected to the drill bit body, and the top of the other end of the movable frame is rotatably connected to a connecting rod. Multiple drill teeth are fixedly provided at intervals at the bottom of the movable frame. A rotary table is rotatably mounted on top of the drill bit body along the axial direction of the drill bit body. The ends of each connecting rod are eccentrically rotatably connected to the rotary table. The rotary table and the drill bit body are connected by a locking mechanism.

2. The adjustable rotary drilling bit as described in claim 1, characterized in that: The top of the turntable has a through hole, and the top of the drill bit body has a plurality of first insertion holes that can be aligned with the through hole at intervals along the circumference. The locking mechanism includes a pin that can slide through the through hole and the corresponding first insertion hole.

3. The adjustable rotary drilling bit as described in claim 2, characterized in that: The movable frame has vertically arranged round rods at both ends. The side wall of the drill bit body is provided with multiple through mounting slots spaced apart circumferentially. A sleeve is rotatably installed in each mounting slot. A through screw hole is provided on the side wall of the sleeve. A limiting rod is rotatably fitted on the bottom of the round rod at the other end of the movable frame. The limiting rod slides through the sleeve. Multiple second insertion holes that can be aligned with the screw holes are spaced apart on the side wall of the limiting rod. A threaded rod is threaded through each screw hole.

4. The adjustable rotary drilling bit as described in claim 3, characterized in that: The sidewall of the drill bit body is provided with multiple through slots spaced apart circumferentially.

5. The adjustable rotary drilling bit as described in claim 4, characterized in that: Each of the two round rods of the movable frame is fitted with a baffle.

6. The adjustable rotary drilling bit as described in claim 5, characterized in that: The cross-section of the baffle is arc-shaped.

7. The adjustable rotary drilling bit as described in any one of claims 2-6, characterized in that: A limit block is fixedly installed at the top of the pin.

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