Anti-collapse exploration drill bit for drilling
By designing an external support assembly to support the drill bit, and using connecting rods and lead screw assemblies to expand the support plate to support the borehole wall, the problem of borehole wall collapse during drilling was solved, achieving rapid emergency support and improving drilling efficiency.
Patent Information
- Application Number
- CN202520246443.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing drilling methods are prone to borehole wall collapse when encountering soft soil layers or water-bearing layers, and the operation of lowering the casing takes a long time, making it impossible to deal with the collapse problem of soft geological layers in a timely manner.
A drilling anti-collapse exploration drill bit was designed, comprising an outer cylinder, a drill bit, an outer support assembly, and a drive shaft. The support plate of the outer support assembly expands through connecting rods and lead screw assemblies to support the borehole wall and prevent the collapse of soft geological layers. The drive shaft is driven by a high-power motor, which responds quickly and supports the borehole wall.
It enables rapid support of the borehole wall, prevents collapse of soft geological layers, provides emergency support, reduces the time required for casing installation, and improves the safety and efficiency of drilling.
Smart Images
Figure CN223707546U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of drilling technology, in particular to a kind of anti-collapse exploration drill bit for drilling. BACKGROUND
[0002] The most widely used exploration method in geological survey is drilling, which can obtain deep geological data and is a tool for drilling underground to obtain geological information such as underground rock, ore and groundwater. In coal mining, exploration drill bits are used for drilling exploration to obtain coal seam and underground rock structure information; in groundwater exploration, exploration drill bits are used for stratum geological exploration to obtain underground water level, water quality and water layer structure information; in geothermal energy development and utilization, exploration drill bits are used for underground thermal water salinity, temperature and thermal water layer structure geological exploration. Drilling into soft soil layer, aquifer and adverse geological structure (such as fold, fault, geological fracture zone) may have adverse effects on the drilling process. Soft soil layer is prone to collapse due to its low stability coefficient and external force; aquifer is prone to collapse due to the pressure of underground water on the hole wall, making the soil loose and weak. The existing drilling method is to lower a protective tube to support the hole wall, but it takes time to operate and cannot respond to emergencies, so other treatment options are needed to respond to soft hole wall collapse. SUMMARY
[0003] Therefore, it is necessary to provide an anti-collapse exploration drill bit for drilling to solve the above problems.
[0004] An anti-collapse exploration drill bit for drilling includes an outer cylinder, a drill bit, an outer support assembly and a transmission shaft. The transmission shaft is movably sleeved in the outer cylinder, and the lower end of the transmission shaft penetrates the outer support assembly and is detachably connected with the drill bit. The outer support assembly includes a lower cylinder, a connecting rod, a support plate and a screw rod assembly. The upper end of the lower cylinder is detachably connected with the lower end of the outer cylinder. The circumferential surface of the lower cylinder is provided with a plurality of slots in the axial direction. The inner side of the lower cylinder is provided with a mounting groove, and the screw rod assembly is arranged in the mounting groove. The lower end of the connecting rod is movably connected with the lower end of the screw rod assembly, the upper end of the connecting rod is movably connected with the movable end of the screw rod assembly, and the middle part of the connecting rod extends from the slot to the outside of the lower cylinder and is movably connected with the support plate.
[0005] Preferably, the inner side of the support plate is provided with a clamping groove, and the middle part of the connecting rod is movably clamped in the clamping groove.
[0006] Preferably, the middle part of the connecting rod is provided with a latch, and the latch is movably clamped in the clamping groove.
[0007] Preferably, the upper end and the lower end of the support plate are connected with the outer circumferential surface of the lower cylinder through spring columns.
[0008] Preferably, the outer side of the transmission shaft is provided with a helical fin.
[0009] The utility model discloses the advantage lies in: with the support of the movable support assembly of outer support assembly, prevent the collapse of soft geological layer, and support mode is extremely flexible, and response speed is fast, and convenient emergency. BRIEF DESCRIPTION OF DRAWINGS
[0010] Fig. 1 It is a kind of drilling anti-collapse exploration drill bit three-dimensional schematic view for one embodiment;
[0011] Fig. 2 It is a kind of drilling anti-collapse exploration drill bit sectional view schematic diagram. DETAILED DESCRIPTION
[0012] To make the above-mentioned purposes, features and advantages of the utility model more apparent, easy to understand, the specific embodiments of the utility model are explained in detail below with the drawings. In the following description, a lot of specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.
[0013] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.
[0014] 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 utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0015] As Figs. 1-2As shown in the figure, a kind of anti-caving exploration drill bit for drilling includes outer cylinder 1, drill bit 2, outer support assembly 3 and transmission shaft 4, the transmission shaft 4 is movably sleeved in outer cylinder 1, the lower end of the transmission shaft 4 penetrates the outer support assembly 3, and is detachably connected with drill bit 2, the outer support assembly 3 includes lower cylinder 31, connecting rod 32, support plate 33 and screw rod assembly 34, the upper end of the lower cylinder 31 is detachably connected with the lower end of outer cylinder 1, the peripheral surface of the lower cylinder 31 is provided with a plurality of grooves 311 along the axial direction thereof, the inner side of the lower cylinder 31 is provided with mounting groove 312, the screw rod assembly 34 is arranged in mounting groove 312, the lower end of connecting rod 32 is movably connected with the lower end of screw rod assembly 34, the upper end of connecting rod 32 is movably connected with the movable end of screw rod assembly 34, and the middle part of connecting rod 32 extends from groove 311 to the outside of lower cylinder 31 and is movably connected with support plate 33. Specifically, in the embodiment, specifically, in the embodiment, the transmission shaft 4 is driven by a high-power motor, the drill bit 2 is rotated by the transmission shaft 4, and drilling is completed. It can be understood that there is a gap between the transmission shaft 4 and the inner wall of the outer cylinder 1, the outer support assembly 3 is connected to the lower end of the outer cylinder 1, the outer support assembly 3 can be single-section or multi-section in series, and the embodiment is single-section. The outer support assembly 3 includes lower cylinder 31, connecting rod 32, support plate 33 and screw rod assembly 34, when drill bit 2 drills to soft geological soil layer, screw rod assembly 34 drives connecting rod 32 to bend from vertical state, so that the middle part of connecting rod 32 protrudes from groove 311 of lower cylinder 31, abuts against support plate 33 and provides an outward supporting force for support plate 33, so that support plate 33 expands outward, when support plate 33 continuously expands outward, it can abut against the hole wall, and then support the hole wall to prevent the hole wall from collapsing, to gain time for subsequent downhole casing.
[0016] As Fig. 2 shown, the inner side of the support plate 33 is provided with a clamping groove 331, and the middle part of the connecting rod 32 is movably clamped in the clamping groove 331. Specifically, the clamping groove 331 limits the middle part of the connecting rod 32, so that the connecting rod 32 protrudes outward under the drive of the screw rod assembly 34 and drives the support plate 33 to expand, and the clamping groove 331 limits the middle part of the connecting rod 32 to avoid deviation.
[0017] As Fig. 2 shown, the middle part of the connecting rod 32 is provided with a latch 321, and the latch 321 is movably clamped in the clamping groove 331. Specifically, in the embodiment, the latch 321 is transversely clamped in the clamping groove 331, and the latch 321 specifically penetrates the middle part of the connecting rod 32 through a bearing, so that the latch 321 rolls and rubs in the clamping groove 331 when sliding in the clamping groove 331, to reduce the friction resistance.
[0018] As Fig. 2As shown, the upper and lower ends of the support plate 33 are connected to the outer circumferential surface of the lower cylinder 31 via spring columns. Specifically, when the support plate 33 is not needed to support the hole wall, it retracts and adheres to the outer circumferential surface of the lower cylinder 31 under the elastic force of the spring columns. When the support plate 33 needs to support the hole wall, it expands outward under the action of the connecting rod 32. At this time, the spring columns can play a limiting role, so that the support plate 33 can only expand outward in the radial direction of the lower cylinder 31, applying a vertical force to the hole wall, supporting the hole wall, and preventing collapse.
[0019] like Figs. 1-2 As shown, a spiral blade 41 is provided on the outer side of the drive shaft 4. The mud and other materials drilled by the drill bit 2 can be lifted and output through the rotating spiral blade 41, reducing drilling resistance.
[0020] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A drilling bit for preventing collapse during drilling, characterized in that: The device includes an outer cylinder, a drill bit, an outer support assembly, and a drive shaft. The drive shaft is movably fitted inside the outer cylinder. The lower end of the drive shaft passes through the outer support assembly and is detachably connected to the drill bit. The outer support assembly includes a lower cylinder, a connecting rod, a support plate, and a lead screw assembly. The upper end of the lower cylinder is detachably connected to the lower end of the outer cylinder. The lower cylinder has several slots along its axial direction on its circumferential surface. The inner side of the lower cylinder has an installation groove. The lead screw assembly is installed in the installation groove. The lower end of the connecting rod is movably connected to the lower end of the lead screw assembly, and the upper end of the connecting rod is connected to the movable end of the lead screw assembly. The middle part of the connecting rod extends from the slot to the outside of the lower cylinder and is movably connected to the support plate.
2. The anti-collapse exploration drill bit for drilling as described in claim 1, characterized in that: The inner side of the support plate is provided with a slot, and the middle part of the connecting rod is movably engaged in the slot.
3. The anti-collapse exploration drill bit for drilling as described in claim 2, characterized in that: A pin is provided in the middle of the connecting rod, and the pin is movably engaged in the slot.
4. The anti-collapse exploration drill bit for drilling as described in claim 1, characterized in that: The upper and lower ends of the support plate are connected to the outer circumferential surface of the lower cylinder via spring columns.
5. The anti-collapse exploration drill bit for drilling as described in claim 1, characterized in that: The outer side of the drive shaft is provided with spiral blades.