Drilling bit for prospecting

Abstract

The utility model discloses a drilling bit for prospecting in the field of geological prospecting, which comprises a bit and a drill rod, and the bit and the drill rod are detachably connected through the matching of a first connecting piece and a second connecting piece. The first connecting piece and the second connecting piece are arranged on the drill bit and the drill rod respectively. Wherein the first connecting piece comprises a plurality of first spiral limiting blocks, and the second connecting piece is provided with second spiral limiting blocks which are in clearance fit with the first spiral limiting blocks. The axial pressure bearing capacity and the circumferential torque resisting capacity of the joint of the drill bit and the drill rod are enhanced through mutual cooperation of the second spiral limiting block and the first spiral limiting block. Through cooperation of the first connecting piece and the second connecting piece, the drill bit and the drill rod can be rapidly assembled and disassembled through the anti-rotation cover which is arranged on the second connecting piece and enables the drill bit and the drill rod to be relatively fixed in the circumferential direction. The anti-rotation cover isolates the second connecting piece and the first connecting piece from the outside, and external impurities are prevented from affecting the combination of the first connecting piece and the second connecting piece.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration, specifically to a drilling bit for mineral exploration. Background Technology

[0002] Mineral exploration, or prospecting for short, is the systematic evaluation of potential mineral resources through geological surveys, drilling, and other technical means. Prospecting requires the use of drill bits to break rocks and obtain rock cores or cuttings. During the drilling process, the drill string needs to continuously provide axial pressure and circumferential torque to ensure that the drill bit can continue to drill below the rock strata.

[0003] Conventional drill bits are fixed to the drill rod via a threaded connection. However, the axial compressive strength and circumferential torque resistance of these threads are weak. With increased use, the threads are prone to deformation and even cracking, causing the drill bit to loosen relative to the drill rod and ultimately preventing normal exploration work. Furthermore, the drill bit and drill rod are difficult to disassemble, hindering equipment maintenance and upkeep. The operating environment of drill bits often contains hard impurities such as gravel, which can easily fall into the threads, further exacerbating thread damage. The existing threaded connection method between drill bits and drill rods limits their normal service life. Utility Model Content

[0004] The purpose of this utility model is to disclose a drilling bit for mineral exploration that maintains a stable connection between the drill bit and the drill rod, enhances the axial bearing capacity and torque resistance at the connection between the drill bit and the drill rod, and extends the service life of the drill bit and the drill rod.

[0005] To achieve the above objectives, this utility model discloses a drilling bit for mineral exploration, comprising a drill bit and a drill rod, wherein the drill bit and the drill rod are detachably connected by a connecting assembly, the connecting assembly comprising:

[0006] The first connector includes a base and a plurality of first spiral limiting blocks, which are evenly distributed around the center of one end face of the base; the other end face of the base is fixedly connected to the drill rod.

[0007] The second connector includes a base plate and a plurality of second spiral limiting blocks that are clearance-fitted with the first spiral limiting block; the plurality of second spiral limiting blocks are evenly distributed around the center of one end face of the base plate; the other end face of the base plate is fixedly connected to the drill bit;

[0008] An anti-rotation cover is used to fix the circumferential position of the first connector relative to the second connector; the anti-rotation cover covers the outside of the fixedly connected first connector and second connector to isolate the first connector and the second connector from the outside world;

[0009] The anti-spinning cover is detachably fixed to the base or to the bottom plate.

[0010] As an optional implementation, a positioning post is provided around the center of a plurality of first spiral limiting blocks on the base, and a positioning hole is provided around the center of a plurality of second spiral limiting blocks on the base plate to cooperate with the positioning post. A first guide chamfer is provided on the inner side of the second spiral limiting block near the positioning hole. The height of the positioning post is higher than the height of the first spiral limiting block.

[0011] Alternatively, a positioning post may be provided around the center of multiple second spiral limiting blocks on the base plate, and a positioning hole may be provided around the center of multiple first spiral limiting blocks on the base to cooperate with the positioning post. A first guide chamfer may be provided on the inner side of the first spiral limiting block near the positioning hole. The height of the positioning post is higher than the height of the second spiral limiting block.

[0012] As an optional implementation, the anti-spin cover includes an anti-spin ring and a cover shell; the anti-spin ring is fixedly connected to the base plate, one end face of the cover shell is fixedly connected to the anti-spin ring, and the other end face is attached to the base; or the anti-spin ring is fixedly connected to the base, one end face of the cover shell is fixedly connected to the anti-spin ring, and the other end face is attached to the base plate.

[0013] As an optional implementation, the cover is cylindrical, and the end face of the cover away from the anti-rotation ring is provided with a slope. The base or the bottom plate is provided with a chamfer that matches the slope, and a sealing ring that fits on the chamfer is provided.

[0014] As an optional implementation, the anti-spin ring has a plurality of strong magnetic protrusions on its inner top wall near the base or the bottom plate, and the plurality of strong magnetic protrusions are evenly distributed around the center of the anti-spin ring at an annular interval; the base or the bottom plate has fixing holes that cooperate with the strong magnetic protrusions.

[0015] As an optional implementation, the edge of the anti-spin ring has an outward protrusion corresponding to the circumferential position of the strong magnetic protrusion; the end face of the anti-spin ring has a boss corresponding to the position of the strong magnetic protrusion.

[0016] As an optional implementation, when the anti-spin ring is fixedly connected to the base, a plurality of reinforcing ribs are provided circumferentially at the connection between the drill rod and the base, and the plurality of reinforcing ribs are spaced at the same interval; the anti-spin ring is provided with an opening for the reinforcing ribs to pass through.

[0017] As an optional implementation, when the anti-spin ring is fixedly connected to the base, the first spiral limiting block has an inner hole; or when the anti-spin ring is fixedly connected to the base plate, the second spiral limiting block has the inner hole.

[0018] The anti-spin ring is provided with a pin at the position corresponding to the inner hole. One end of the pin passes through the anti-spin ring and a part of the pin enters the inner hole. The end face of the pin that does not enter the inner hole is in contact with the inner top wall of the anti-spin ring.

[0019] As an optional implementation, a spring is provided at the bottom of the inner hole, one end of the spring is in contact with the bottom wall of the inner hole, and the other end is in contact with the end of the pin that enters the inner hole.

[0020] As an optional implementation, the pin includes a pin post and a head, the pin post passing through the anti-rotation ring and the inner hole, and the head being integrated with the end of the pin post that does not enter the inner hole; the head is polygonal, and the anti-rotation ring is provided with a polygonal countersunk hole that matches the head.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] (1) By cooperating with the first spiral limiting block, the axial position of the drill bit relative to the drill rod is quickly fixed, and the anti-rotation cover determines the circumferential position of the drill bit relative to the drill rod, thereby improving the efficiency of assembling or disassembling the drill bit and the drill rod.

[0023] (2) The anti-rotation cover isolates the first and second connecting parts from the outside world, which can prevent hard impurities from falling into the space between the first and second connecting parts, so as to ensure the stability and durability of the assembly of the first and second connecting parts.

[0024] (3) The curved surface of the second spiral limiting block fits into the curved surface of the first spiral limiting block, thereby increasing the axial force-bearing area of ​​the drill bit and drill rod and the area of ​​circumferential torque bearing, thus improving the axial pressure bearing capacity and circumferential torque resistance of the drill bit and drill rod. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is an exploded view of the present invention;

[0028] Figure 3This is a schematic diagram of the assembly of the drill bit and drill rod disclosed in an embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the drill bit structure disclosed in an embodiment of this utility model;

[0030] Figure 5 This is a partial cross-sectional schematic diagram of the first connector disclosed in an embodiment of this utility model;

[0031] Figure 6 This is a first-view exploded view of the drill pipe disclosed in this embodiment of the utility model;

[0032] Figure 7 This is a cross-sectional schematic diagram of the anti-spinning shield disclosed in an embodiment of this utility model;

[0033] Figure 8 This is a second-view exploded view of the drill pipe disclosed in this embodiment of the utility model;

[0034] Figure 9 yes Figure 8 Enlarged view of point A in the middle.

[0035] Explanation of key figure labels:

[0036] 1. Drill bit; 11. Convex ring;

[0037] 2. Drill pipe; 21. Reinforcing ribs;

[0038] 3. First connecting piece; 31. First spiral limiting block; 311. Inner hole; 312. Spring; 313. Second guide chamfer; 32. Positioning hole; 321. First guide chamfer; 322. First bottom chamfer; 33. Base;

[0039] 4. Second connector; 41. Base plate; 411. Fixing hole; 412. Through hole; 413. Polygonal countersunk hole; 42. Second spiral limiting block; 421. Third guide chamfer; 422. Second bottom chamfer; 43. Positioning post; 431. Third bottom chamfer;

[0040] 5. Anti-rotation cover; 51. Pin; 511. Head; 512. Pin post; 52. Cover; 521. Slope; 53. Anti-rotation ring; 531. Outer protrusion; 532. Opening; 533. Boss; 54. Strong magnetic protrusion. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0046] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0047] Please see Figures 1 to 3This application provides a prospecting drill bit 1, including a drill bit 1 and a drill rod 2, which are detachably connected via a connecting assembly. The drill rod 2 continuously applies axial pressure and circumferential torque to the drill bit 1, enabling the drill bit 1 to continuously perform prospecting work. The connecting assembly includes a first connecting member 3, a second connecting member 4, and an anti-rotation shield 5. The first connecting member 3 and the second connecting member 4 are respectively disposed on the drill bit 1 and the drill rod 2.

[0048] The first connecting member 3 includes a base 33 and a first spiral limiting block 31. The base 33 is disc-shaped, and multiple first spiral limiting blocks 31 are evenly distributed around the center of one end face of the base 33. The other end face of the base 33 is fixedly connected to the drill rod 2. The second connecting member 4 includes a base plate 41 and multiple second spiral limiting blocks 42 that are clearance-fitted with the first spiral limiting blocks 31. The multiple second spiral limiting blocks 42 are evenly distributed around the center of one end face of the base plate 41, and the other end face of the base plate 41 is fixedly connected to the drill bit 1.

[0049] The anti-rotation cover 5 is used to fix the circumferential position of the first connecting member 3 relative to the second connecting member 4, preventing the first connecting member 3 and the second connecting member 4 from rotating relative to each other. The anti-rotation cover 5 covers the outside of the fixedly connected first connecting member 3 and the second connecting member 4 to isolate the first connecting member 3 and the second connecting member 4 from the outside. When one side of the anti-rotation cover 5 is detachably fixed to the base 33, the other side extends towards the drill bit 1 and isolates the already screwed-on first connecting member 3 and the second connecting member 4 from the outside; when one side of the anti-rotation cover 5 is detachably fixed to the base plate 41, the other side extends towards the drill rod 2 and isolates the already screwed-on first connecting member 3 and the second connecting member 4 from the outside.

[0050] The axial fixing effect of the second spiral limiting block 42 and the first spiral limiting block 31, and the circumferential fixing effect of the anti-spin cover 5, allow the drill bit 1 to be quickly assembled onto or disassembled from the drill rod 2, thereby improving the efficiency of assembling or disassembling the drill bit 1 and the drill rod 2.

[0051] The curved surface of the second spiral limiting block 42 fits into the curved surface of the first spiral limiting block 31, increasing the axial force-bearing area and the circumferential torque-bearing area of ​​the drill bit 1 and the drill rod 2. This improves the axial pressure-bearing capacity and circumferential torque resistance of the drill bit 1 and the drill rod 2, and enhances the axial and circumferential deformation resistance at the connection between the drill bit 1 and the drill rod 2. This is beneficial to improving the service life of the drill bit 1 and the drill rod 2, and facilitates increasing the continuous working time of the drill bit 1 and the drill rod 2.

[0052] The working environment of drill bit 1 generally contains a lot of impurities such as gravel and sand. When these hard particles enter the connection between drill bit 1 and drill rod 2, they may cause the connection between drill bit 1 and drill rod 2 to be loose, which is detrimental to the service life of drill bit 1. After drill bit 1 and drill rod 2 are connected by the cooperation of first connecting member 3 and second connecting member 4, anti-rotation cover 5 isolates second connecting member 4 and first connecting member 3 from the outside environment. This prevents hard impurities from falling into the assembly gap between first connecting member 3 and second connecting member 4, so as to ensure the tightness and stability of the assembly of drill bit 1 and drill rod 2.

[0053] Please see Figure 4 The drill bit 1 has multiple symmetrically distributed protruding rings 11. The user can use external tools such as crowbars or levers to apply external force to the protruding rings 11, thereby rotating the drill bit 1 relative to the drill rod 2, so that the second helical limiting block 42 and the first helical limiting block 31 engage with each other. Through the mutual engagement of the second helical limiting block 42 and the first helical limiting block 31, the axial position of the drill bit 1 relative to the drill rod 2 is initially determined.

[0054] See Figures 5 to 6 In some embodiments, a positioning post 43 is provided around the center of a plurality of second spiral limiting blocks 42 on the base plate 41. The height of the positioning post 43 is higher than the height of the second spiral limiting blocks 42. A positioning hole 32 is provided around the center of a plurality of first spiral limiting blocks 31 on the base 33 for the positioning post 43 to pass through. During the process of the second spiral limiting blocks 42 and the first spiral limiting blocks 31 approaching each other, the positioning post 43 contacts the first spiral limiting block 31 first, so that the first connecting member 3 and the second connecting member 4 can quickly maintain coaxiality, laying the groundwork for subsequent cooperation. A first guide chamfer 321 is provided on the side of the first spiral limiting block 31 near the positioning hole 32. The first guide chamfer 321 can guide the positioning post 43 to embed into the positioning hole 32, speeding up the efficiency of aligning the positioning post 43 with the positioning hole 32.

[0055] In some embodiments, a positioning post 43 may be provided around the center of a plurality of first spiral limiting blocks 31 on the base 33, and a positioning hole 32 that mates with the positioning post 43 may be provided around the center of a plurality of second spiral limiting blocks 42 on the base plate 41. A first guide chamfer 321 may be provided on the inner side of the second spiral limiting block 42 near the positioning hole 32. The height of the positioning post 43 is higher than the height of the first spiral limiting block 31.

[0056] See Figure 2 and Figure 7In some embodiments, the anti-spin cover 5 includes an anti-spin ring 53 and a housing 52. The housing 52 is cylindrical, and one end of the housing 52 is integrated with the anti-spin ring 53. When the anti-spin cover 5 is fixedly connected to the base plate 41, the end face of the housing 52 away from the anti-spin ring 53 is in contact with the base 33; when the anti-spin cover 5 is fixedly connected to the base 33, the end face of the housing 52 away from the anti-spin ring 53 is in contact with the base plate 41. The end face of the housing 52 away from the anti-spin ring 53 is provided with a slope 521, which is distributed in a ring on the inner wall of the housing 52. The base 33 or the base plate 41 is provided with a chamfer that matches the slope 521, and a sealing ring that fits the slope 521 is provided on the chamfer. During the assembly of the anti-spin cover 5, the slope 521 on the cover 52 gradually approaches the chamfer on the base 33 or the bottom plate 41. The cooperation between the slope 521 and the chamfer increases the sealing area between the anti-spin cover 5 and the first connecting member 3. The two sides of the sealing ring are respectively attached to the slope 521 and the chamfer, which helps to improve the sealing between the cover 52 and the first connecting member 3 and improve the protection effect of the anti-spin cover 5 on the first connecting member 3 and the second connecting member 4.

[0057] See Figures 7 to 9 In some embodiments, the anti-spin ring 53 has multiple strong magnetic protrusions 54 arranged circumferentially, with equal spacing between them. When the anti-spin ring is fixedly connected to the base, a fixing hole is provided on the base corresponding to the position of the strong magnetic protrusion; when the anti-spin ring is fixedly connected to the base plate, a fixing hole is provided on the base plate corresponding to the position of the strong magnetic protrusion. The strong magnetic protrusions 54 are generally made of strong magnetic materials such as neodymium iron boron. After the strong magnetic protrusions 54 are embedded in the fixing holes 411, the anti-spin cover 5 is fixedly connected to the base 33 or the base plate 41 under the action of magnetic force. The outer peripheral wall of the anti-spin cover 5 has an outward protrusion 531 corresponding to the circumferential position of the strong magnetic protrusion, and the outer end face of the anti-spin ring 53 has a boss 533 corresponding to the position of the strong magnetic protrusion 54. When assembling the anti-rotation cover 5, the user can determine the circumferential position of the strong magnetic protrusion 54 relative to the fixing hole 411 by the indication of the outer protrusion 531 and the boss 533, which makes it easy for the user to quickly align the strong magnetic protrusion 54 with the fixing hole 411 and improve the assembly efficiency of the anti-rotation cover 5. When it is necessary to remove the anti-rotation cover 5, the outer protrusion 531 can provide a point of force, which makes it easy for the user to manually or with the help of tools apply force along the length of the drill rod 2 to the anti-rotation cover 5, so that the anti-rotation cover 5 is separated from the base 33 or the base plate 41.

[0058] In some embodiments, when the anti-spin ring 53 is fixedly connected to the base 33, a plurality of reinforcing ribs 21 are provided circumferentially at the connection between the drill rod 2 and the base plate 41. The plurality of reinforcing ribs 21 are spaced at equal intervals, and the anti-spin ring 53 is provided with an opening 532 for the reinforcing ribs 21 to pass through. On the one hand, the reinforcing ribs 21 can prevent deformation at the connection between the drill rod 2 and the base plate 41 due to stress concentration, ensuring the stability of the connection between the base plate 41 and the drill rod 2; on the other hand, after the reinforcing ribs 21 pass through the opening 532, they can provide circumferential support to the anti-spin cover 5, preventing the anti-spin cover 5 from becoming circumferentially loose under excessive external force.

[0059] See Figures 4 to 6 In some embodiments, when the anti-spin ring 53 is fixedly connected to the base 33, the first spiral limiting block 31 has an inner hole 311; or when the anti-spin ring 53 is fixedly connected to the base plate 41, the second spiral limiting block 42 has an inner hole 311. The anti-spin cover 5 has a pin 51 corresponding to the position of the inner hole 311. One end of the pin 51 passes through the anti-spin ring and enters the inner hole 311, while the other end is in contact with the inner top wall of the anti-spin cover 5. Under the action of the pin 51, the second spiral limiting block 42 and the first spiral limiting block 31 remain relatively fixed in the circumferential direction. The anti-spin cover 5 applies external force to the end of the pin 51 away from the inner hole 311 to prevent the pin 51 from disengaging from the inner hole 311.

[0060] In some embodiments, the actual machining length of each pin 512 may differ. As the usage time increases, the length of pins 512 at different positions may change asynchronously due to differences in friction conditions. Under the influence of these factors, the anti-rotation ring 53 may not be able to fully fit with all pins 512, resulting in some pins 51 becoming axially loose. This can easily lead to uneven force distribution between components and cause problems with loose equipment assembly.

[0061] A spring 312 is provided at the bottom of the inner hole 311. One end of the spring 312 contacts the bottom surface of the inner hole 311, and the other end is compressed by the pin 512. Under the action of the spring 312, when there are differences in the length of each pin 512, under the restoring force of the spring 312, each pin 512 can be in contact with the inner top wall of the anti-rotation ring 53, preventing uneven force between different components. When disassembling the drill bit 1 and the drill rod 2, after the anti-rotation cover 5 is removed from the first connecting piece 3, the pin 51 will automatically extend out of the inner hole 311 under the action of the spring 312, which reduces the time for the user to remove the pin 51 and improves the efficiency of disassembling the drill bit 1 and the drill rod 2.

[0062] See Figures 8 to 9In some embodiments, the pin 51 includes a pin post 512 and a head 511. A portion of the pin post 512 enters the inner hole 311, and the other end is integrated with the head 511. The inner bottom surface of the anti-rotation ring 53 is in contact with the head 511. The head 511 of the pin 51 is polygonal, and the base plate 41 is provided with a polygonal countersunk hole 413 that mates with the polygonal head 511. When the head 511 of the pin 51 is inserted into the polygonal countersunk hole 413, the circumferential direction of the pin 51 remains fixed, which can prevent unnecessary wear caused by the rotation of the pin 51. When the head of the pin 51 is inserted into the countersunk hole, the anti-rotation ring 53 can not only press the pin 51 tightly, but also fit against the base plate 41, increasing the force-bearing area of ​​the anti-rotation ring 53 and preventing the anti-rotation ring 53 from deforming due to excessive local pressure.

[0063] See Figures 4 to 6 In some embodiments, the first spiral limiting block 31 of the first connector 3 has a second guide chamfer 313 on its end face near the second connector 4, and the second spiral limiting block 42 has a third guide chamfer 421. When the positioning post 43 engages with the positioning hole 32, the first connector 3 and the second connector 4 need to be deflected relative to each other. Under the guidance of the second guide chamfer 313 and the third guide chamfer 421, it is easy for each second spiral limiting block 42 to screw into the gap between each first spiral limiting block 31, so that multiple first spiral limiting blocks 31 and multiple second spiral limiting blocks 42 can be quickly screwed together, achieving the effect of quick connection between the first connector 3 and the second connector 4.

[0064] In some embodiments, a first bottom chamfer 322 is provided at the connection between the first spiral limiting block 31 and the base 33, a second bottom chamfer 422 is provided at the connection between the base plate 41 and the second spiral limiting block 42, and a third bottom chamfer 431 is provided at the bottom of the positioning post 43 to cooperate with the first guide chamfer 321. After multiple first spiral limiting blocks 31 and multiple second spiral limiting blocks 42 are screwed together, the first bottom chamfer 322 and the second bottom chamfer 422 cooperate to reduce the gap between the assembled first spiral limiting blocks 31 and second spiral limiting blocks 42. This ensures the tightness of the screwing of the second spiral limiting block 42 and the lower spiral limiting block, prevents the existence of internal gaps from causing local deformation between components due to uneven force, and improves the axial bearing capacity and circumferential torque resistance of the first connecting member 3 and the second connecting member 4.

[0065] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A drilling bit for mineral exploration, comprising a drill bit and a drill rod, wherein the drill bit and the drill rod are detachably connected via a connecting assembly, characterized in that, The connection component includes: The first connector includes a base and a plurality of first spiral limiting blocks, which are evenly distributed around the center of one end face of the base; the other end face of the base is fixedly connected to the drill rod. The second connector includes a base plate and a plurality of second spiral limiting blocks that are clearance-fitted with the first spiral limiting block; the plurality of second spiral limiting blocks are evenly distributed around the center of one end face of the base plate; the other end face of the base plate is fixedly connected to the drill bit; An anti-rotation cover is used to fix the circumferential position of the first connector relative to the second connector; the anti-rotation cover covers the outside of the fixedly connected first connector and second connector to isolate the first connector and the second connector from the outside world; The anti-spinning cover is detachably fixed to the base or to the bottom plate.

2. The prospecting drill bit according to claim 1, characterized in that, The base has a positioning post at the center of the plurality of first spiral limiting blocks, and the base plate has a positioning hole at the center of the plurality of second spiral limiting blocks that mate with the positioning post; the inner side of the second spiral limiting block near the positioning hole has a first guide chamfer, and the height of the positioning post is higher than the height of the first spiral limiting block. Alternatively, a positioning post may be provided around the center of a plurality of second spiral limiting blocks on the base plate, and a positioning hole may be provided around the center of a plurality of first spiral limiting blocks on the base to cooperate with the positioning post; a first guide chamfer may be provided on the inner side of the first spiral limiting block near the positioning hole, and the height of the positioning post may be higher than the height of the second spiral limiting block.

3. The prospecting drill bit according to claim 1, characterized in that, The anti-spin cover includes an anti-spin ring and a cover shell; the anti-spin ring is fixedly connected to the base plate, one end face of the cover shell is fixedly connected to the anti-spin ring, and the other end face is attached to the base; Alternatively, the anti-spin ring may be fixedly connected to the base, one end face of the cover may be fixedly connected to the anti-spin ring, and the other end face may be attached to the base plate.

4. The prospecting drill bit according to claim 3, characterized in that, The cover is cylindrical, and the end face of the cover away from the anti-rotation ring is provided with a slope. The base or the bottom plate is provided with a chamfer that matches the slope, and a sealing ring that fits the slope is provided on the chamfer.

5. The prospecting drill bit according to claim 3 or 4, characterized in that, The anti-spin ring has multiple strong magnetic protrusions on its inner top wall near the base or the bottom plate. The multiple strong magnetic protrusions are evenly distributed in a ring around the center of the anti-spin ring. The base or the bottom plate has fixing holes that cooperate with the strong magnetic protrusions.

6. The prospecting drill bit according to claim 5, characterized in that, The edge of the anti-rotation ring has an outward protrusion corresponding to the circumferential position of the strong magnetic protrusion; the end face of the anti-rotation ring has a protrusion corresponding to the position of the strong magnetic protrusion.

7. The prospecting drill bit according to claim 3, characterized in that, When the anti-spin ring is fixedly connected to the base, multiple reinforcing ribs are provided circumferentially at the connection between the drill rod and the base, and the multiple reinforcing ribs are spaced at the same interval; the anti-spin ring is provided with an opening for the reinforcing ribs to pass through.

8. The prospecting drill bit according to claim 3, characterized in that, When the anti-spin ring is fixedly connected to the base, the first spiral limiting block has an inner hole; or when the anti-spin ring is fixedly connected to the base plate, the second spiral limiting block has the inner hole. The anti-spin ring is provided with a pin at the position corresponding to the inner hole. One end of the pin passes through the anti-spin ring and a part of the pin enters the inner hole. The end face of the pin that does not enter the inner hole is in contact with the inner top wall of the anti-spin ring.

9. The prospecting drill bit according to claim 8, characterized in that, A spring is provided at the bottom of the inner hole. One end of the spring contacts the bottom wall of the inner hole, and the other end is contacted by the end of the pin that enters the inner hole.

10. The prospecting drill bit according to claim 8 or 9, characterized in that, The pin includes a pin post and a head. The pin post passes through the anti-rotation ring and the inner hole. The head post is integrated with the end of the pin post that does not enter the inner hole. The head post is polygonal, and the anti-rotation ring is provided with a polygonal countersunk hole that matches the head post.

Images