Geological prospecting drilling bit

Abstract

The utility model relates to a geological prospecting drilling bit which comprises a bit main body and a drill rod, the bit main body is connected with the drill rod through a lifting sleeve capable of changing the distance between the bit main body and the drill rod, and the top of the bit main body is further provided with a rock mass cut-off assembly located in the lifting sleeve. A sample storage pipe located in a pipe cavity of the lifting sleeve is further arranged at the axial upper end of the rock mass cutting assembly, and the lifting sleeve can synchronously change the working position of a pressing and cutting piece of the rock mass cutting assembly when pushing the drill bit body to move downwards relatively. Therefore, the plurality of pressing and cutting pieces which are arranged at intervals in the annular direction cut a rock mass in a centripetal clamping and extruding mode. According to the core sample centripetal clamping and shearing device, centripetal clamping, shearing and pressing can be carried out on the core sample, the cut-off position of the core sample is accurately positioned, the flatness of the cut-off position is improved, and therefore the integrity and integrity of the cut core sample are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to geological prospecting drilling equipment technical field especially relates to a geological prospecting drilling drill bit. BACKGROUND

[0002] Geological prospecting refers to using certain drilling mechanical equipment and process to obtain the rock and ore sample below the ground surface, and is an important method to obtain accurate geological data below the ground surface. Drilling construction can drill holes in rock strata through drilling mechanical equipment and take out rock and ore samples, thereby making reliable evaluation of geological and mineral resources parameters, wherein the drill bit is an important tool in the geological prospecting drilling process, which not only needs to be oriented to drill into the underground soil and rock layer according to the demand, but also needs to collect the core sample at a specific underground depth according to the demand to realize the drilling detection of stratum data.

[0003] When collecting the core sample, the existing drilling equipment usually stores the columnar core sample in a lumen structure, thereby taking out the core sample synchronously in the process of lifting the drilling tool. However, the conventional drilling equipment is mainly suitable for pressurizing and retaining the dispersed core sample in the lumen structure, and cannot controllably cut the part of the core sample drilled from a single ore, resulting in that the integral core sample is difficult to be directly taken out. Although some drilling equipment considers cutting the rock mass by twisting and pulling to obtain the core sample, the fracture position of the rock mass cannot be effectively positioned, resulting in that the actual fracture point may appear on the core sample in the lumen structure and cannot guarantee the integrity of the sample. In addition, the above cutting method easily causes poor flatness of the fracture section and increases the sample amount lost in the cutting operation, and easily causes the core sample to be broken and cannot guarantee the accuracy of the stratum information representation. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a geological prospecting drilling drill bit which can centripetally pinch and shear the core sample to accurately position the cutting position of the core sample and improve the flatness of the cutting position, thereby guaranteeing the integrity and completeness of the cut core sample, so as to solve the problems that the existing drilling equipment cannot effectively position the fracture position, easily damages the integrity of the core sample, the cutting position easily appears uneven fracture and increases the sample amount lost in the cutting operation, and the core sample is broken and cannot guarantee the accuracy of the stratum information representation.

[0005] The technical solution adopted by this utility model is as follows: a geological exploration drilling bit, including a drill bit body and a drill rod. The drill bit body is connected to the drill rod through a lifting sleeve that can change the distance between the drill bit body and the drill rod. The top of the drill bit body is also provided with a rock mass cutting component in the lifting sleeve. The upper axial end of the rock mass cutting component is also provided with a sample storage tube in the cavity of the lifting sleeve. The lifting sleeve can simultaneously change the working position of the cutting discs of the rock mass cutting component when pushing the drill bit body to move downward, so that the multiple cutting discs arranged circumferentially at intervals can cut the rock mass in a centripetal clamping manner.

[0006] According to a preferred embodiment, the lifting sleeve includes a lower sleeve, an upper outer sleeve, and hydraulic lifting rods. The lower sleeve is detachably sleeved on the upper outer wall of the drill bit body, and the top end of the lower sleeve is inserted into the upper outer sleeve. A plurality of hydraulic lifting rods are circumferentially spaced on the top annular surface of the lower sleeve. The upper axial end of the upper outer sleeve away from the lower sleeve is movably sleeved on the drill rod. The upper axial end of the hydraulic lifting rod away from the lower sleeve is connected to the bottom surface of the drill rod.

[0007] According to a preferred embodiment, an arc-shaped ring is provided on the inner wall of the lower sleeve, which controlsably drives a plurality of circumferentially spaced pressure plates to perform centripetal squeezing motion.

[0008] According to a preferred embodiment, a silicone filling collar capable of filling the assembly gap is also embedded on the top annular surface of the upper outer sleeve.

[0009] According to a preferred embodiment, the rock mass cutting component includes the cutting plate, an inner connecting pipe, and a connecting ring sleeve, wherein the connecting ring sleeve is sleeved on the inner connecting pipe, and the cutting plate is circumferentially connected to the lower edge of the connecting ring sleeve at intervals.

[0010] According to a preferred embodiment, the pressing piece includes an inclined arc plate that is sleeved with the connecting ring and can fit with the outer wall surface of the inner connecting tube, and an arc-shaped piece that is connected to the lower edge of the inclined arc plate.

[0011] According to a preferred embodiment, the inner connecting tube has circumferentially spaced through openings that allow the arc-shaped segment to pass through, and an edge-sealing rubber sleeve is fitted inside the through openings.

[0012] According to a preferred embodiment, a vertical sliding groove and a lower clamping groove are formed on the outer pipe wall of the inner connecting pipe, the vertical sliding groove is communicated with the lower clamping groove through a side opening groove, a sliding block is slidingly installed in the vertical sliding groove, a resilient support arc piece is detachably installed on the side end face of the sliding block extending to the outside of the vertical sliding groove, and the end of the resilient support arc piece away from the sliding block is clamped in the lower clamping groove.

[0013] According to a preferred embodiment, the inner connecting pipe of the rock mass cutting assembly is connected with the drill bit body through a telescopic inner pipe, wherein the axial lower end of the inner connecting pipe is inserted into the upper pipe joint of the telescopic inner pipe.

[0014] According to a preferred embodiment, the upper pipe joint of the telescopic inner pipe is connected with the lower pipe joint through a stretchable rubber sleeve, and the lower pipe joint is inserted into the inner wall of the upper section of the drill bit body.

[0015] The utility model discloses the beneficial effects are:

[0016] The rock mass cutting assembly provided by the application can cut the rock core sample controllably when the columnar rock core sample completely enters the sample storage pipe and the lower half of the rock core sample is still connected with the rock mass, so that the effective cutting of the rock mass is realized, the rock mass cutting assembly can accurately position the ring cutting position, so that the accuracy of the rock mass fracture position is ensured, abnormal fracture of the rock core sample in the sample storage pipe is avoided, and the integrity of the sample after cutting is ensured. The ring cutting method of the rock mass cutting assembly can improve the flatness of the fracture section, avoid the spread of cracks during the cutting of the rock core sample to affect the integrity of the rock core sample, avoid the fragmentation of the rock core sample to reduce the damage range and the broken loss of the rock mass during the cutting operation, and thus ensure the accuracy of the rock core sample in representing the formation information. In addition, the rock mass cutting assembly can limit the rock core sample after cutting to ensure the storage stability of the rock core sample in the sample storage pipe. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a preferred structure schematic view of the geological prospecting drill bit put forward by the utility model;

[0018] Figure 2 is an enlarged structure schematic view of the A area of the preferred geological prospecting drill bit put forward by the utility model;

[0019] Figure 3 is an axial plane schematic view of the rock mass cutting assembly of the preferred geological prospecting drill bit put forward by the utility model;

[0020] Figure 4 is a structure schematic view of the preferred geological prospecting drill bit in the cutting posture put forward by the utility model.

[0021] List of reference signs

[0022] 1: drill bit body; 2: drill rod; 3: lifting sleeve; 4: rock body intercepting assembly; 5: sample storage tube; 6: telescopic inner tube; 31: lower joint sleeve; 32: upper outer sleeve; 33: hydraulic lifting rod; 311: circular arc ring body; 321: silica gel filling sleeve ring; 41: pressure intercepting piece; 42: inner connecting tube; 43: connecting ring sleeve; 411: inclined arc plate; 412: arc intercepting piece; 421: through hole; 422: edge covered rubber sleeve; 423: vertical sliding groove; 424: lower clamping groove; 425: side opening groove; 426: sliding block; 427: elastic support arc piece; 61: upper tube joint; 62: stretchable rubber sleeve; 63: lower tube joint. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the present application will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] The technical solutions provided by the present application will be described in detail below with reference to the drawings by way of embodiments. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In some examples, since some embodiments belong to prior art or conventional technology, they are not described or not described in detail.

[0025] In addition, the technical features described in this paper, or the steps in all the methods or processes disclosed, can be combined in any suitable way in one or more embodiments, except for mutually exclusive features and / or steps. Those skilled in the art will easily understand that the order of steps or operations of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only used for illustration and does not imply that it is required to follow a certain order, unless it is explicitly stated that it is required to follow a certain order.

[0026] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects and do not have any order or technical meaning. The "connection" and "coupling" in this application include direct and indirect connections (couplings) under reasonable circumstances (without constituting a self-contradictory situation).

[0027] The following will be described in detail in combination with the drawings.

[0028] Embodiment 1

[0029] The application provides a geological prospecting drilling drill bit, which comprises a drill bit body 1, a drill rod 2, a lifting sleeve 3, a rock mass cutting assembly 4, a sample storage pipe 5 and a telescopic inner pipe 6.

[0030] According to Figures 1-4 In a specific embodiment shown, the drill bit body 1 is connected with the drill rod 2 through the lifting sleeve 3 capable of changing the distance between the drill bit body 1 and the drill rod 2. The top of the drill bit body 1 is further provided with the rock mass cutting assembly 4 in the lifting sleeve 3. The axial upper end of the rock mass cutting assembly 4 is further provided with the sample storage pipe 5 in the lumen of the lifting sleeve 3. The lifting sleeve 3 can change the working position posture of the pressure cutting piece 41 of the rock mass cutting assembly 4 synchronously when the drill bit body 1 is pushed to move downward relatively, so that the multiple pressure cutting pieces 41 arranged in a ring are cut off in a centripetal clamping manner. The rock mass cutting assembly 4 provided in the application can cut the core sample controllably when the columnar core sample completely enters the sample storage pipe 5 and the lower half of the core sample is still connected with the rock mass, so as to realize the effective cutting of the rock mass. The rock mass cutting assembly 4 can accurately position the ring cutting position, so as to ensure the accuracy of the rock mass fracture position, avoid the abnormal fracture of the core sample in the sample storage pipe 5, and ensure the integrity of the sample after cutting. The ring cutting method of the rock mass cutting assembly 4 can improve the flatness of the fracture section, avoid the crack propagation during the cutting of the core sample to affect the integrity of the core sample, avoid the fragmentation of the core sample to reduce the damage range and the broken loss amount of the cutting operation of the rock mass, so as to ensure the accuracy of the core sample in representing the stratum information.

[0031] Preferably, an inner ring step and an outer ring step are respectively arranged on the inner side and the outer side of the upper section of the drill bit body 1. Specifically, the vertical ring wall of the inner ring step and the vertical ring wall of the outer ring step are respectively provided with inner threads and outer threads matched with the outer threads of the lower pipe joint 63 and the inner threads of the lower sleeve pipe 31. The drill bit body 1 provided in the application can be connected with the telescopic inner pipe 6 and the lifting sleeve 3 in the inner sleeve connection and outer plug-in connection manner, so as to form a multi-layer cylinder structure, so as to drill according to the demand and realize the effective preservation of the columnar core sample.

[0032] Preferably, the axial upper end of the drill rod 2 is connected with the drilling driving device installed on the ground through the support frame, so that the drill rod 2 can be driven to move controllably for drilling and lifting. The vertical groove is also provided on the side wall of the drill rod 2, so that the inner protrusions circularly and spacedly arranged on the inner wall of the upper outer sleeve 32 of the lifting sleeve 3 can be slidably tracked in the vertical groove, so that when the drill rod 2 rotates for drilling, due to the cooperation between the vertical groove and the inner protrusions, the lifting sleeve 3 is forced to rotate with the drill rod 2, so as to ensure the effectiveness of the transmission. In addition, the lifting sleeve 3 also realizes the transmission of the drilling rotation force through the hydraulic lifting rod 33. Further preferably, the bottom surface of the drill rod 2 can also be provided with a threaded cap, so that the sample storage tube 5 is threadedly connected to the axial lower end surface of the drill rod 2, so that the sample storage tube 5 can also rotate synchronously.

[0033] Preferably, the lifting sleeve 3 includes a lower joint sleeve 31, an upper outer sleeve 32 and a hydraulic lifting rod 33. Preferably, the lower joint sleeve 31 is detachably sleeved on the outer wall of the upper section of the drill bit body 1. Further preferably, the top end of the lower joint sleeve 31 is inserted into the upper outer sleeve 32. Preferably, a plurality of hydraulic lifting rods 33 are also circularly and spacedly arranged on the top ring surface of the lower joint sleeve 31. Preferably, the upper outer sleeve 32 is movably sleeved on the drill rod 2 away from the axial upper end of the lower joint sleeve 31. Preferably, the hydraulic lifting rod 33 is connected to the bottom surface of the drill rod 2 away from the axial upper end of the lower joint sleeve 31, so that the hydraulic lifting rod 33 drives the lower joint sleeve 31 and the upper outer sleeve 32 to move up and down along the axial direction by changing the length of the rod body. Preferably, the hydraulic lifting rod 33 can adopt LZT-560A type high-precision thrust hydraulic push rod. The lower joint sleeve 31 and the upper outer sleeve 32 provided in the present application can cooperatively build a tubular outer sleeve structure capable of accommodating and protecting the rock mass cutting assembly 4, the sample storage tube 5 and the telescopic inner tube 6, and connecting the drill bit body 1 and the drill rod 2, so as to conveniently perform drilling transmission while protecting the sample storage structure. The hydraulic lifting rod 33 provided in the present application can drive the outer protective sleeve structure formed by the lower joint sleeve 31 and the upper outer sleeve 32 and the drill bit body 1 to move downward relatively according to the demand, so as to force the rock mass cutting assembly 4 to change the working posture and complete the positioning and cutting of the columnar core sample, so as to facilitate the acquisition of the complete columnar core sample.

[0034] Preferably, the inner wall of the lower joint sleeve 31 is provided with a circular arc ring body 311 capable of controllably driving the circularly and spacedly arranged plurality of pressure cutting pieces 41 to move centripetally. Specifically, when the lower joint sleeve 31 is driven to move downward by the hydraulic lifting rod 33, the circular arc ring body 311 can extrude and push the outwardly opened pressure cutting pieces 41, so that the pressure cutting pieces 41 gradually insert into the lumen of the inner connecting tube 42, so that the centripetally clamped pressure cutting pieces 41 shear and press the core sample in the lumen of the inner connecting tube 42 to position and cut the columnar core sample.

[0035] Preferably, a silica gel filling ring 321 capable of filling the assembly gap is embedded on the top end annular surface of the upper outer sleeve 32. Preferably, an inner protrusion is arranged on the inner wall of the upper outer sleeve 32, so that when the upper outer sleeve 32 is relatively raised and lowered, the inner protrusion can slide up and down in the vertical groove, and when the drill rod 2 rotates, the inner protrusion is limited by the vertical groove to force the upper outer sleeve 32 to rotate synchronously with the drill rod 2.

[0036] Preferably, the rock body cutting assembly 4 comprises a pressure cutting piece 41, an inner connecting pipe 42, and a connecting ring sleeve 43. Preferably, the connecting ring sleeve 43 is sleeved on the upper part of the inner connecting pipe 42. Further preferably, the lower edge of the connecting ring sleeve 43 is connected with the pressure cutting piece 41 in a ring-shaped manner. The pressure cutting piece 41 provided in the present application can be arranged on the outer side of the inner connecting pipe 42 in a ring-shaped outward expansion manner through the connecting ring sleeve 43, so that the pressure cutting piece 41 can be deflected towards the central axis under the pushing of the circular arc ring body 311, so that the pressure cutting piece 41 can gradually insert into the inner connecting pipe 42 to effectively cut and cut the columnar rock core in the inner connecting pipe 42.

[0037] Preferably, the pressure cutting piece 41 comprises an inclined arc plate 411 connected with the connecting ring sleeve 43 and capable of being fitted with the outer wall surface of the inner connecting pipe 42, and an arc-shaped cutting piece 412 connected with the lower edge of the plate body of the inclined arc plate 411 and capable of inserting into the lumen of the inner connecting pipe 42 to cut the rock body. Specifically, the pressure cutting piece 41 is made of an integral pipe shell material, that is, the pressure cutting piece 41 is constructed by cutting and shaping the lower section of the integral pipe shell material. Preferably, a bending reinforcing rib capable of assisting in defining the corner shape structure of the arc-shaped cutting piece 412 is arranged on the outer side of the inclined arc plate 411. In a specific attitude change, the inclined outwardly inclined arc plate 411 can be deflected to gradually become vertical under the pushing of the circular arc ring body 311, so that the arc-shaped cutting piece 412 connected therewith can gradually insert into the inner connecting pipe 42.

[0038] Preferably, through holes 421 for the arc-shaped section 412 to pass through are arranged on the pipe wall of the inner connecting pipe 42 in circumferential intervals. Further preferably, a covered rubber sleeve 422 is sleeved in the through hole 421. Specifically, the through holes 421 are arranged in circumferential intervals in a one-to-one correspondence with the arc-shaped section 412. Preferably, a vertical sliding slot 423 and a lower clamping slot 424 are arranged on the outer pipe wall of the inner connecting pipe 42. Specifically, the vertical sliding slot 423 is communicated with the lower clamping slot 424 through a side opening slot 425. Preferably, a sliding block 426 is slidingly installed in the vertical sliding slot 423. Preferably, a resilient supporting arc piece 427 is detachably installed on the side end face of the sliding block 426 extending out of the vertical sliding slot 423. Further preferably, one end of the resilient supporting arc piece 427 away from the sliding block 426 is clamped in the lower clamping slot 424. Specifically, in the initial state, the arc-shaped section 412 is partially inserted into the through hole 421, and there is a certain gap between the lower edge of the through hole 421 and the arc-shaped section 412, so as to facilitate the requirement of the movement space of the slight downward movement of the arc-shaped section 412 during the further transverse insertion. The resilient supporting arc piece 427 provided in the application is a rigid metal piece, which can assist in defining the initial shape and inclination of the pressure section 41 by bending support.

[0039] Preferably, the inner connecting pipe 42 of the rock mass cutting assembly 4 is connected with the drill bit main body 1 through the telescopic inner pipe 6. Preferably, the axial lower end of the inner connecting pipe 42 is inserted into the upper pipe joint 61 of the telescopic inner pipe 6. Preferably, the upper pipe joint 61 of the telescopic inner pipe 6 is connected with the lower pipe joint 63 through the stretchable rubber sleeve 62. Further preferably, the lower pipe joint 63 is inserted into the inner wall of the upper section of the drill bit main body 1. The stretchable rubber sleeve 62 provided in the application is a tubular sleeve structure made of elastic high-strength rubber, and a wear-resistant coating is coated on the inner wall surface thereof, so that it can be stretched and deformed as needed and ensure the integral communication of the lumen.

[0040] Preferably, the hydraulic lifting rod 33 and other electrical elements are electrically connected with the controller and the power supply. The control mode of the application is controlled by the controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of the power supply also belongs to the common knowledge in the art, and the mechanical device and the mechanical structure features thereof are only protected by the application. Therefore, the control mode and the circuit connection are not explained in detail.

[0041] The utility model is not limited to the above optional implementation, anyone can draw other various forms of product under the enlightenment of the utility model, but no matter make any change in its shape or structure, all the technical schemes falling into the scope defined by the utility model claims are within the protection scope of the utility model. The utility model specification and its drawings should be understood as illustrative rather than limiting the claims. The protection scope of the utility model is defined by the claims and its equivalents. In the full text, the features guided by "preferably" are only optional ways, and should not be understood as necessarily setting, so the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A geological prospecting drilling drill bit, comprising a drill bit body (1) and a drill rod (2), characterized in that, the drill bit body (1) is connected with the drill rod (2) through a lifting sleeve (3) capable of changing the distance between the drill bit body (1) and the drill rod (2), and the top of the drill bit body (1) is further provided with a rock mass cutting assembly (4) in the lifting sleeve (3), and the axial upper end of the rock mass cutting assembly (4) is further provided with a sample storage tube (5) in the lumen of the lifting sleeve (3), wherein, the lifting sleeve (3) can change the working position of the pressure intercepting piece (41) of the rock mass cutting assembly (4) synchronously when the drill bit body (1) is pushed to move downward relatively, so that the multiple pressure intercepting pieces (41) arranged in a circumferential interval cut off the rock mass in a centripetal clamping manner.

2. The geological exploration drill bit of claim 1, wherein, The lifting sleeve (3) comprises a lower joint sleeve (31), an upper outer sleeve (32) and a hydraulic lifting rod (33), wherein, the lower joint sleeve (31) is detachably sleeved on the outer wall of the upper section of the drill bit body (1), and the top end of the lower joint sleeve (31) is inserted into the upper outer sleeve (32), and multiple hydraulic lifting rods (33) are further arranged on the top circumferential surface of the lower joint sleeve (31) in a circumferential interval; the upper outer sleeve (32) is movably sleeved on the drill rod (2) away from the axial upper end of the lower joint sleeve (31); the hydraulic lifting rod (33) is connected to the bottom surface of the drill rod (2) away from the axial upper end of the lower joint sleeve (31).

3. A geological exploration drill bit as claimed in claim 2, wherein, A circular arc ring body (311) capable of driving the circumferentially spaced pressure intercepting pieces (41) to move in a centripetal clamping manner is arranged on the inner pipe wall of the lower joint sleeve (31).

4. The geological exploration drill bit of claim 3, wherein, A silica gel filling ring (321) capable of filling the assembly gap is further embedded on the top circumferential surface of the pipe body of the upper outer sleeve (32).

5. A geological exploration drill bit as claimed in claim 4, wherein, The rock mass cutting assembly (4) comprises the pressure intercepting piece (41), an inner connecting pipe (42) and a connecting ring sleeve (43), wherein, the connecting ring sleeve (43) is sleeved on the upper end of the inner connecting pipe (42), and the lower edge of the connecting ring sleeve (43) is circumferentially and interval connected with the pressure intercepting piece (41).

6. A geological exploration drill bit as claimed in claim 5 wherein, The pressure intercepting piece (41) comprises an inclined arc plate (411) connected with the connecting ring sleeve (43) and capable of being fitted with the outer wall surface of the inner connecting pipe (42), and an arc-shaped intercepting piece (412) connected with the lower edge of the plate body of the inclined arc plate (411).

7. A geological exploration drill bit as claimed in claim 6 wherein, Through holes (421) capable of allowing the arc-shaped intercepting piece (412) to pass through are circumferentially and interval arranged on the pipe wall of the inner connecting pipe (42), and a rimmed rubber sleeve (422) is sleeved in the through hole (421).

8. A geological exploration drill bit as claimed in claim 7, wherein, A vertical sliding groove (423) and a lower clamping groove (424) are arranged on the outer pipe wall of the inner connecting pipe (42), and the vertical sliding groove (423) communicates with the lower clamping groove (424) through a side opening groove (425), A sliding block (426) is slidingly installed in the vertical sliding slot (423), and an elastic supporting arc piece (427) is detachably installed on the side end face of the sliding block (426) extending to the outside of the vertical sliding slot (423), and the end of the elastic supporting arc piece (427) away from the sliding block (426) is clamped in the lower clamping slot (424).

9. A geological exploration drill bit as claimed in claim 8, wherein, The inner connecting pipe (42) of the rock mass intercepting assembly (4) is connected with the drill bit main body (1) through the telescopic inner pipe (6), wherein the axial lower end of the inner connecting pipe (42) is inserted and assembled in the upper pipe joint (61) of the telescopic inner pipe (6).

10. A geological exploration drill bit as claimed in claim 9, wherein, The upper pipe joint (61) of the telescopic inner pipe (6) is connected with the lower pipe joint (63) through the stretchable rubber sleeve (62), and the lower pipe joint (63) is inserted and assembled on the inner wall of the upper section of the drill bit main body (1).

Images