A stepped drill bit and deep hole positioning assembly thereof

Abstract

The present invention discloses a stepped drill bit and a deep hole positioning assembly thereof, comprising a drill bit, an upper end surface of the drill bit being rotatably connected to a drill rod, a self-driving mechanism being provided on the drill bit, a sampling assembly being provided inside the drill bit, protective assemblies being provided on both sides of the sampling assembly, and a cleaning assembly being provided on the protective assembly. When the driving rod moves downward, the drill bit at the driving hole where the spiral groove is located rotates, but the drill rod does not rotate, that is, the extrusion rod to which the drill rod is fixedly connected via a fixed axis does not rotate. When the drill bit rotates, the elastic block in the sampling groove on the drill bit rotates, and the elastic block is squeezed by the extrusion rod when passing through one end of the extrusion rod. The elastic block is squeezed and expanded, and the filter holes in the corresponding elastic block are thereby expanded, thereby facilitating better entry of groundwater into the storage cavity inside the drill bit through the filter holes. The filter holes are continuously squeezed, expanded, and contracted, which can also prevent the filter holes from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of drill bits, in particular to a stepped drill bit and a deep hole positioning component thereof. Background Art

[0002] A drill bit is a tool used to create through holes or blind holes in solid materials, as well as to expand existing holes. Common drill bits include twist drills, spade drills, center drills, deep-hole drills, and trepanning drills. Although reamer drills and countersinks cannot drill solid materials, they are traditionally classified as drill bits.

[0003] In existing technologies, particularly in the field of groundwater surveying, when surveying the location of groundwater, a surveying device is used to drill a hole underground. A sensor assembly is mounted on the drill bit required for drilling. The drill bit moves underground. When it reaches a groundwater area, the sensing portion of the sensor assembly on the drill bit contacts the water, thereby receiving a signal and transmitting the groundwater location information to a terminal on the ground. The drill bit is then removed from the ground using the surveying device, and a specialized sampling device is used to advance along the original borehole to collect samples. This process has at least the following problems: 1. The groundwater location is first detected using the drill bit, and then the specialized sampling device is used to collect samples. This operation is time-consuming and requires additional instruments for sampling, resulting in low economic efficiency. 2. The sensing portion of the sensor assembly on the drill bit is generally located on the outer surface of the drill bit, thereby facilitating more accurate contact with water. However, the sensing portion of the sensor assembly is easily damaged by the impact of the underground soil as the drill bit moves underground. 3. During sampling, part of the soil layer is easily brought into the sampling container, thereby affecting the sampling quality.

[0004] To this end, a stepped drill bit and a deep hole positioning assembly thereof are proposed. Summary of the Invention

[0005] The object of the present invention is to provide a stepped drill bit and a deep hole positioning assembly thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a stepped drill bit, comprising a drill bit, the upper end face of the drill bit being rotatably connected to a drill rod, the drill bit being provided with a self-driving mechanism, a sampling assembly being provided inside the drill bit, protective assemblies being provided on both sides of the sampling assembly, and a cleaning assembly being provided on the protective assembly.

[0007] Preferably, the self-driving mechanism includes a driving hole, which is provided at the bottom of the inner surface of the drill bit, and a spiral groove is provided on the inner wall of the driving hole, a group of transmission rods are inserted into the spiral groove and are transmission-connected, the transmission rod is fixedly connected to the driving rod, the lower end of the driving rod extends out of the driving hole and does not contact, a driving cavity is provided in the drill bit, the driving rod extends through the driving cavity and is movably connected, the part of the driving rod extending into the driving cavity is inserted through and rotatably connected with a cross plate, the cross plate is slidably connected in the driving cavity, and a driving spring is fixedly connected to the cross plate, and the driving spring is located in the driving cavity and is sleeved on the driving rod.

[0008] Preferably, the sampling assembly includes a control chamber, which is elliptical and is opened in the upper part of the drill bit. A fixed shaft is fixedly connected to the bottom of the drill rod, and the fixed shaft extends into the control chamber and is rotatably connected. An extrusion rod is fixedly connected to the lower end of the fixed shaft. A sampling groove is opened in the control chamber, and an elastic block is fixedly connected to the inner wall of the sampling groove. Filter holes are densely opened in the elastic block, and a storage chamber is opened at the bottom of the control chamber.

[0009] Preferably, the filter hole is configured as a fine hole at one end facing the outside of the drill bit, and the filter hole is configured as a tapered hole with its pore diameter expanded outwardly at one end facing the inside of the drill bit.

[0010] Preferably, the protective assembly includes a protective cavity, which is opened at the bottom of the inner surface of the control cavity, and washing cavities are opened on both sides of the protective cavity. A cross bar is slidably connected in the protective cavity, and the cross bar is rotatably connected to the upper end of the driving rod. Protective plates are fixedly connected on both sides of the cross bar, and the protective plates are slidably connected in the washing cavity.

[0011] Preferably, the cleaning component includes a cleaning tank, which is opened on the side wall of the washing chamber. A rotating shaft is fixedly connected in the cleaning tank, and a sponge ring is rotatably connected to the outer side of the rotating shaft. The sponge ring is tightly contacted with the protective plate.

[0012] Preferably, an outlet is provided at the bottom of the cleaning tank, the bottom of the cleaning tank is inclined outward, a connecting roller is fixedly connected to the inclined surface of the bottom of the cleaning tank, and an extrusion cylinder is rotatably connected to the connecting roller.

[0013] Preferably, the extrusion cylinder partially extends into the sponge ring and is movably connected, the outlet is hinged with a hinged piece, and the hinged piece is provided with a torsion spring at the outlet hinge.

[0014] Preferably, a drill tip is fixedly connected to the bottom of the driving rod, and the drill tip corresponds to the bottom of the drill bit.

[0015] Preferably, a deep hole positioning assembly of a stepped drill bit includes a sensor assembly, wherein the sensor assembly is arranged in the drill bit, a switch is embedded and fixedly connected to the bottom of the drill bit, a wire is electrically connected between the switch and the sensor assembly, and the switch is located above the drill tip.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention moves the drill rod downward when detecting groundwater, and the drill bit connected to the lower end of the drill rod rotates and moves downward, and the driving rod and the drill tip at the bottom of the drill bit move downward. When it contacts the ground, due to the obstruction of the ground, the drill tip drives the driving rod to move toward the drill bit, and the drill tip finally fits the bottom of the drill bit. During this process, the driving spring on the driving rod is continuously compressed, thereby storing energy for subsequent sampling operations after the groundwater is detected. Since the transmission rod fixedly connected to the drill bit limits the spiral groove in the driving hole, when the driving rod moves, the transmission rod fixedly connected to the driving rod moves in the spiral groove. Due to the vertical spiral characteristics of the spiral groove, when the driving rod moves downward, the driving spring is pressed against the driving rod. When moving, the drill bit where the driving hole where the spiral groove is located rotates, and the drill rod does not rotate, that is, the extrusion rod fixedly connected to the drill rod by the fixed axis does not rotate. The drill bit rotates, that is, the elastic block in the sampling groove on the drill bit rotates. The elastic block is squeezed by the extrusion rod when passing through one end of the extrusion rod. The elastic block is squeezed and expanded, and the filter holes in the corresponding elastic block are thereby expanded, so that groundwater can better pass through the filter holes into the storage cavity inside the drill bit. The filter holes are constantly squeezed, expanded and contracted, which can also prevent the filter holes from being blocked. In this way, after detecting groundwater, samples can be automatically taken back to the ground, so that no additional equipment is required for re-sampling. It is convenient and cost-effective.

[0018] 2. The present invention is designed with a sampling trough for groundwater to flow into the storage cavity of the drill bit. The filter holes on the elastic block in the sampling trough are used to filter larger solid impurities in the groundwater. When the driving rod moves upward, the cross bar connected to the driving rod rotates and moves upward. The protective plate fixed to the cross bar moves upward to cover the sampling trough, thereby preventing the soil from impacting the elastic block and entering the storage cavity when the drill bit moves underground.

[0019] 3. In the present invention, after the drill tip and the bottom surface of the drill bit are fitted together, the drill bit continues to move downward under the action of the downward push of the drill rod, that is, it moves underground. When the drill bit moves to the groundwater area, the driving rod and the drill tip at the bottom of the drill bit first lose the limit of the underground soil layer and move in the direction away from the drill bit due to the force of the driving spring. At this time, the switch loses the limit of the drill tip and turns on the sensor assembly through the wire, so that the groundwater can be automatically detected and information such as the groundwater position can be transmitted to the ground control terminal. The sensor assembly is arranged inside the drill bit, so as to better protect the sensor assembly to prevent the sensor assembly on the drill bit from being damaged by the impact of the soil layer when the drill bit moves underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall structural view of the present invention;

[0021] Figure 2 It is an overall cross-sectional view of the present invention;

[0022] Figure 3 A cross-sectional view of the present invention as a whole;

[0023] Figure 4 It is the overall internal structure diagram of the present invention;

[0024] Figure 5 A combined view of the driving rod and the spiral groove of the present invention;

[0025] Figure 6 A top view of the present invention;

[0026] Figure 7 is a cross-sectional view of the elastic block of the present invention;

[0027] Figure 8 It is a partial cross-sectional view of the present invention;

[0028] Figure 9 For the present invention Figure 8 Magnified view of A.

[0029] In the picture:

[0030] 1. Drill bit; 11. Drill rod; 2. Self-driving mechanism; 21. Drive hole; 22. Drive rod; 23. Spiral groove; 24. Transmission rod; 25. Drive chamber; 26. Cross plate; 27. Drive spring; 3. Sampling assembly; 31. Control chamber; 32. Fixed axis; 33. Extrusion rod; 34. Sampling slot; 35. Elastic block; 36. Filter hole; 37. Storage chamber; 361. Fine pore; 362. Conical hole; 4. Protective assembly; 41. Protective chamber; 42. Cross bar; 43. Protective plate; 44. Washing chamber; 5. Cleaning assembly; 51. Cleaning slot; 52. Rotating shaft; 53. Sponge ring; 6. Connecting roller; 61. Extrusion cylinder; 62. Outlet; 7. Hinge piece; 9. Drill tip; 100. Sensor assembly; 101. Wire; 102. Switch. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1 to 9 , the present invention provides a technical solution:

[0033] A stepped drill bit and its deep hole positioning assembly include a drill bit 1, the upper end face of the drill bit 1 is rotatably connected to a drill rod 11, the drill bit 1 is provided with a self-driving mechanism 2, a sampling assembly 3 is provided inside the drill bit 1, protective assemblies 4 are provided on both sides of the sampling assembly 3, and a cleaning assembly 5 is provided on the protective assembly 4.

[0034] As an embodiment of the present invention, Figure 2 and Figure 5 As shown, the self-driving mechanism 2 includes a driving hole 21, which is provided at the bottom of the inner surface of the drill bit 1. A spiral groove 23 is provided on the inner wall of the driving hole 21. A group of transmission rods 24 are inserted into and transmission-connected to the spiral groove 23. The transmission rod 24 is fixedly connected to the driving rod 22. The lower end of the driving rod 22 extends out of the driving hole 21 and does not contact it. A driving cavity 25 is provided in the drill bit 1. The driving rod 22 extends through the driving cavity 25 and is movably connected. The part of the driving rod 22 extending into the driving cavity 25 is penetrated and rotationally connected with a cross plate 26. The cross plate 26 is slidably connected in the driving cavity 25, and a driving spring 27 is fixedly connected to the cross plate 26. The driving spring 27 is located in the driving cavity 25 and is sleeved on the driving rod 22.

[0035] During operation, when detecting groundwater, the drill rod 11 is moved downward, and the drill bit 1 connected to the lower end of the drill rod 11 is rotated and moved downward, and the driving rod 22 and the drill tip 9 at the bottom of the drill bit 1 move downward. When contacting the ground, due to the obstruction of the ground, the drill tip 9 drives the driving rod 22 to move in the direction of the drill bit 1, and the drill tip 9 finally fits with the bottom of the drill bit 1. During this process, the driving spring 27 on the driving rod 22 is continuously compressed, thereby storing energy for subsequent sampling operations after groundwater is detected;

[0036] Since the transmission rod 24 fixedly connected to the drill bit 1 limits the spiral groove 23 in the drive hole 21, when the drive rod 22 moves, the transmission rod 24 fixedly connected to the drive rod 22 moves in the spiral groove 23. Due to the vertical spiral characteristics of the spiral groove 23, when the drive rod 22 moves downward, the drill bit 1 where the drive hole 21 where the spiral groove 23 is located rotates, thereby releasing energy.

[0037] As an embodiment of the present invention, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 and Figure 7As shown, the sampling assembly 3 includes a control chamber 31, which is elliptical and is opened in the upper part of the drill bit 1. The bottom of the drill rod 11 is fixedly connected to a fixed shaft 32, which extends into the control chamber 31 and is rotatably connected. The lower end of the fixed shaft 32 is fixedly connected to an extrusion rod 33. A sampling groove 34 is opened in the control chamber 31, and an elastic block 35 is fixedly connected to the inner wall of the sampling groove 34. Filter holes 36 are densely opened in the elastic block 35. A storage chamber 37 is opened at the bottom of the control chamber 31. The end of the filter hole 36 facing the outside of the drill bit 1 is set as a fine hole 361, and the end of the filter hole 36 facing the inside of the drill bit 1 is set as a tapered hole 362 with an outward expansion of the aperture diameter.

[0038] During operation, the sampling groove 34 is used to allow groundwater to flow into the storage chamber 37 of the drill bit 1. The filter holes 36 on the elastic block 35 in the sampling groove 34 are used to filter larger solid impurities in the groundwater. The drill rod 11 does not rotate, and the extrusion rod 33 fixedly connected to the drill rod 11 by the fixed shaft 32 does not rotate. The drill bit 1 rotates, that is, the elastic block 35 in the sampling groove 34 on the drill bit 1 rotates. When the elastic block 35 rotates and passes through one end of the extrusion rod 33, it is squeezed and expanded by the extrusion rod 33. The elastic block 35 is squeezed and expanded, and the filter holes 36 in the corresponding elastic block 35 are thereby expanded, so that the groundwater can better pass through the filter holes 36 into the storage chamber 37 inside the drill bit 1. The filter holes 36 are constantly squeezed, expanded and contracted, which can also prevent the filter holes 36 from being blocked.

[0039] As an embodiment of the present invention, Figure 2 、 Figure 4 、 Figure 6 and Figure 8 As shown, the protection component 4 includes a protection cavity 41, which is opened at the bottom of the inner surface of the control cavity 31. Washing cavities 44 are opened on both sides of the protection cavity 41. A cross bar 42 is slidably connected in the protection cavity 41. The cross bar 42 is rotatably connected to the upper end of the driving rod 22. Protection plates 43 are fixedly connected on both sides of the cross bar 42, and the protection plates 43 are slidably connected in the washing cavity 44.

[0040] During operation, when the driving rod 22 moves upward, the cross bar 42 connected to the driving rod 22 rotates and moves upward, and the protective plate 43 fixedly connected to the cross bar 42 moves upward to cover the sampling groove 34, preventing the soil layer from impacting the elastic block 35 and entering the storage chamber 37 when the drill bit 1 moves underground.

[0041] As an embodiment of the present invention, Figure 9As shown, the cleaning component 5 includes a cleaning tank 51, which is opened on the side wall of the washing chamber 44, and a rotating shaft 52 is fixedly connected in the cleaning tank 51. A sponge ring 53 is rotatably connected to the outside of the rotating shaft 52. The sponge ring 53 and the protective plate 43 are in close contact and connection. An outlet 62 is opened at the bottom of the cleaning tank 51, and the bottom of the cleaning tank 51 is inclined outward. A connecting roller 6 is fixedly connected to the inclined surface of the bottom of the cleaning tank 51, and an extrusion cylinder 61 is rotatably connected to the connecting roller 6. The extrusion cylinder 61 partially extends into the sponge ring 53 and is movably connected. A hinged piece 7 is hinged at the outlet 62, and a torsion spring is provided at the hinged part of the hinged piece 7 at the outlet 62.

[0042] During operation, when the driving rod 22 moves in the direction away from the drill bit 1, the cross bar 42 moves downward, and the protective plate 43 fixedly connected to the cross bar 42 moves downward. The sponge ring 53 on the outside of the protective plate 43 rotates due to the movement of the protective plate 43, and the soil layer and groundwater adhered to the protective plate 43 are wiped by the rotating sponge ring 53, thereby cleaning the protective plate 43. The sponge ring 53 is squeezed by the extrusion cylinder 61 to precipitate the soil layer and groundwater and leave the drill bit 1 along the outlet 62, thereby preventing the protective plate 43 from bringing in too much soil when extending into the washing cavity 44 and remaining in the washing cavity 44.

[0043] As an embodiment of the present invention, Figure 1 、 Figure 2 and Figure 3 As shown, a drill tip 9 is fixedly connected to the bottom of the driving rod 22 , and the drill tip 9 corresponds to the bottom of the drill bit 1 .

[0044] During operation, the design of the drill tip 9 enables it to serve as a pressure-bearing part of the drive rod 22 when it is obstructed and squeezed by the ground, thereby increasing the working area of the pressure-bearing surface, thereby better enabling the drive rod 22 to move toward the drill bit 1, and when the drill tip 9 and the bottom surface of the drill bit 1 are in contact, it can prevent foreign matter from entering the drive hole 21 when the drill bit 1 moves underground.

[0045] According to the above-mentioned deep hole positioning component of a stepped drill bit, it includes a sensor component 100, which is arranged in the drill bit 1. A switch 102 is embedded and fixedly connected to the bottom of the drill bit 1. A wire 101 is electrically connected between the switch 102 and the sensor component 100, and the switch 102 is located above the drill tip 9.

[0046] During operation, after the drill tip 9 and the bottom surface of the drill bit 1 are fitted together, the drill bit 1 continues to move downward under the action of the downward push of the drill rod 11, that is, it moves underground. When the drill bit 1 moves to the groundwater area, the driving rod 22 and the drill tip 9 at the bottom of the drill bit 1 first lose the limit of the underground soil layer and move in the direction away from the drill bit 1 due to the force of the driving spring 27. At this time, the switch 102 loses the limit of the drill tip 9 and turns on the sensor assembly 100 through the wire 101, so that the groundwater can be automatically detected and information such as the groundwater position can be transmitted to the ground control terminal. The sensor assembly 100 is arranged inside the drill bit 1 so as to better protect the sensor assembly 100 to prevent the sensor assembly 100 on the drill bit 1 from being damaged by the impact of the soil layer when the drill bit 1 moves underground.

[0047] Working principle: When detecting groundwater, the drill rod 11 is moved downward, and the drill bit 1 connected to the lower end of the drill rod 11 is rotated and moved downward. The driving rod 22 and the drill tip 9 at the bottom of the drill bit 1 move downward. When contacting the ground, due to the obstruction of the ground, the drill tip 9 drives the driving rod 22 to move toward the drill bit 1. The drill tip 9 eventually fits into the bottom of the drill bit 1. During this process, the driving spring 27 on the driving rod 22 is continuously compressed, thereby storing energy for subsequent sampling operations after groundwater is detected.

[0048] The sampling slot 34 is used for groundwater to flow into the storage chamber 37 of the drill bit 1. The filter holes 36 on the elastic block 35 in the sampling slot 34 are used to filter larger solid impurities in the groundwater. When the driving rod 22 moves upward, the cross bar 42 connected to the driving rod 22 moves upward, and the protective plate 43 fixedly connected to the cross bar 42 moves upward to cover the sampling slot 34, thereby preventing the soil from impacting the elastic block 35 and entering the storage chamber 37 when the drill bit 1 moves underground.

[0049] The design of the drill tip 9 allows it to act as a pressure-bearing member for the drive rod 22 when it is obstructed and squeezed by the ground, thereby increasing the working area of the pressure-bearing surface, thereby better enabling the drive rod 22 to move toward the drill bit 1. Moreover, when the drill tip 9 and the bottom surface of the drill bit 1 are in contact, foreign matter can be prevented from entering the drive hole 21 when the drill bit 1 moves underground.

[0050] After the drill tip 9 and the bottom surface of the drill bit 1 are in contact, the switch 102 is squeezed by the drill tip 9. The switch 102 is compressed and controls the sensor assembly 100 to be closed and inactive through the wire 101. The sensor assembly 100 is provided with a battery, which supplies power to the sensor assembly 100.

[0051] After the drill tip 9 and the bottom surface of the drill bit 1 are in contact, the drill bit 1 continues to move downward under the action of the downward push of the drill rod 11, that is, it moves underground. When the drill bit 1 moves to the groundwater area, due to the soft geology of the soil layer around the groundwater, the drive rod 22 and the drill tip 9 at the bottom of the drill bit 1 first lose the limit of the underground soil layer and move in the direction away from the drill bit 1 due to the force of the drive spring 27. At this time, the switch 102 loses the limit of the drill tip 9 and turns on the sensor assembly 100 through the wire 101 (the circuit components of the sensor assembly 100 and the switch 102 are waterproofed), so that the groundwater can be automatically detected and information such as the groundwater location can be transmitted to the ground control terminal (the sensor assembly 100 is connected to a wireless transmitter, and the collected information is uploaded to the surface receiving terminal through the wireless transmitter. The sensor head is located at the switch 102 (not shown in the figure)). The sensor assembly 100 is arranged inside the drill bit 1, so as to better protect the sensor assembly 100 to prevent the sensor assembly 100 on the drill bit 1 from being damaged by the impact of the soil layer when the drill bit 1 moves underground;

[0052] When the driving rod 22 moves in the direction away from the drill bit 1, the cross bar 42 moves downward, and the protective plate 43 fixedly connected to the cross bar 42 moves downward. The sponge ring 53 on the outside of the protective plate 43 rotates due to the friction generated by the movement of the protective plate 43. The soil layer and groundwater adhered to the protective plate 43 are wiped by the rotating sponge ring 53, thereby cleaning the protective plate 43. The sponge ring 53 is squeezed by the squeezing cylinder 61 to separate out the soil layer and groundwater and leave the drill bit 1 through the outlet 62, thereby preventing the protective plate 43 from bringing in too much soil when extending into the washing cavity 44 and retaining it in the washing cavity 44;

[0053] When the drill bit 1 is in the groundwater area, groundwater passes through the wash chamber 44 and flows out through the opening at the bottom of the wash chamber 44, thereby further removing the dirt in the wash chamber 44;

[0054] Since the transmission rod 24 fixedly connected to the drill bit 1 limits the spiral groove 23 in the drive hole 21, when the drive rod 22 moves, the transmission rod 24 fixedly connected to the drive rod 22 moves in the spiral groove 23. Due to the vertical spiral characteristics of the spiral groove 23, when the drive rod 22 moves downward, the drill bit 1 where the drive hole 21 where the spiral groove 23 is located rotates, and the drill rod 11 does not rotate, that is, the extrusion rod 33 fixedly connected to the drill rod 11 through the fixed shaft 32 does not rotate. When the drill bit 1 rotates, the elastic block 35 in the sampling groove 34 on the drill bit 1 rotates. The elastic block 35 rotates and is squeezed by the squeezing rod 33 when passing one end of the squeezing rod 33. The elastic block 35 is squeezed and expanded, and the filter hole 36 in the corresponding elastic block 35 is thereby expanded, so that groundwater can better pass through the filter hole 36 into the storage chamber 37 inside the drill bit 1. The filter hole 36 is continuously squeezed, expanded and contracted, which can also prevent the filter hole 36 from being blocked. In this way, after detecting groundwater, samples can be automatically taken back to the ground, so that no additional equipment is required for re-sampling, which is convenient and economical.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A stepped drill bit, comprising a drill bit (1), characterized in that: The upper end surface of the drill bit (1) is rotatably connected to a drill rod (11), the drill bit (1) is provided with a self-driving mechanism (2), a sampling assembly (3) is provided inside the drill bit (1), protective assemblies (4) are provided on both sides of the sampling assembly (3), and a cleaning assembly (5) is provided on the protective assembly (4); The self-driving mechanism (2) includes a driving hole (21), the driving hole (21) is provided at the bottom of the inner surface of the drill bit (1), the inner wall of the driving hole (21) is provided with a spiral groove (23), a group of transmission rods (24) are inserted into the spiral groove (23) and are transmission-connected, the transmission rods (24) are fixedly connected to the driving rods (22), the lower ends of the driving rods (22) extend out of the driving hole (21) and do not contact the driving hole (21), a driving cavity (25) is provided in the drill bit (1), the driving rods (22) extend through the driving cavity (25) and are movably connected, the part of the driving rods (22) extending into the driving cavity (25) is inserted through and rotationally connected to a transverse plate (26), the transverse plate (26) is slidably connected in the driving cavity (25), and a driving spring (27) is fixedly connected to the transverse plate (26), and the driving spring (27) is located in the driving cavity (25) and sleeved on the driving rod (22).

2. A stepped drill bit according to claim 1, characterized in that: The sampling assembly (3) comprises a control chamber (31), the control chamber (31) being elliptical and being opened in the upper part of the drill bit (1). The bottom of the drill rod (11) is fixedly connected to a fixed shaft (32), the fixed shaft (32) extends through the control chamber (31) and is rotatably connected thereto, the lower end of the fixed shaft (32) is fixedly connected to an extrusion rod (33), a sampling groove (34) is opened in the control chamber (31), an elastic block (35) is fixedly connected to the inner wall of the sampling groove (34), and filter holes (36) are densely opened in the elastic block (35), and a storage chamber (37) is opened at the bottom of the control chamber (31).

3. A stepped drill bit according to claim 2, characterized in that: One end of the filter hole (36) facing the outside of the drill bit (1) is configured as a fine hole (361), and one end of the filter hole (36) facing the inside of the drill bit (1) is configured as a tapered hole (362) with an outwardly enlarged hole diameter.

4. The stepped drill bit according to claim 2, characterized in that: The protection assembly (4) comprises a protection cavity (41), the protection cavity (41) being opened at the bottom of the inner surface of the control cavity (31), and wash cavities (44) being opened on both sides of the protection cavity (41), a cross bar (42) being slidably connected in the protection cavity (41), the cross bar (42) being rotatably connected to the upper end of the driving rod (22), and protection plates (43) being fixedly connected on both sides of the cross bar (42), and the protection plates (43) being slidably connected in the wash cavities (44).

5. The stepped drill bit according to claim 4, characterized in that: The cleaning assembly (5) comprises a cleaning groove (51), the cleaning groove (51) being provided on the side wall of the washing chamber (44), a rotating shaft (52) being fixedly connected in the cleaning groove (51), a sponge ring (53) being rotatably connected to the outer side of the rotating shaft (52), and the sponge ring (53) and the protective plate (43) being in close contact and connection.

6. The stepped drill bit according to claim 5, characterized in that: An outlet (62) is provided at the bottom of the cleaning tank (51). The bottom of the cleaning tank (51) is inclined outward. A connecting roller (6) is fixedly connected to the inclined surface of the bottom of the cleaning tank (51). An extrusion cylinder (61) is rotatably connected to the connecting roller (6).

7. The stepped drill bit according to claim 6, characterized in that: The extrusion cylinder (61) partially extends into the sponge ring (53) and is movably connected. A hinged piece (7) is hinged at the outlet (62). A torsion spring is provided at the hinged portion of the hinged piece (7) at the outlet (62).

8. The stepped drill bit according to claim 1, characterized in that: The bottom of the driving rod (22) is fixedly connected to a drill tip (9), and the drill tip (9) corresponds to the bottom of the drill bit (1).

9. A deep hole positioning assembly for a stepped drill bit, applied to a stepped drill bit according to any one of claims 1 to 8, comprising a sensor assembly (100), characterized in that: The sensor assembly (100) is arranged in the drill bit (1), a switch (102) is embedded and fixedly connected to the bottom of the drill bit (1), a wire (101) is electrically connected between the switch (102) and the sensor assembly (100), and the switch (102) is located above the drill tip (9).

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