A roller cone drill bit for geological exploration

Abstract

This application relates to the field of drilling tools and discloses a roller cone drill bit for geological exploration. In order to solve the problem of lubricating oil leakage due to wear of the seal when it rubs against the shaft for a long time, a cylindrical sealing sleeve is provided. The sealing sleeve is pressed against the outside of the mounting shaft by the sealing pressure ring, thereby forming a seal between the drill bit and the mounting shaft. When the pressing part of the sealing pressure ring wears after long-term operation, the total amount of lubricating oil inside the drill bit will decrease. Under the elastic push of the pressure ring top spring, the position of the sealing pressure ring on the sealing sleeve is switched. In this way, the sealing part of the sealing sleeve is changed to ensure the seal between the mounting shaft and the drill bit, thus achieving the effect of self-adjusting seal after the seal wears.

Description

Technical Field

[0001] This application relates to the field of drilling tools, and in particular to a roller cone drill bit for geological exploration. Background Technology

[0002] Roller cone drill bits used in geological exploration are the most widely used type of drill bit in drilling history. Their working principle primarily utilizes the rotation of the cones and the impact of the cutting edges to break rocks and achieve the drilling objective. Roller cone drill bits can be classified in several ways: according to the cutting material, they can be divided into steel-tooth (milled-tooth) and insert-tooth roller cone drill bits; according to the number of cones, they can be divided into single-cone, three-cone, and multi-cone drill bits.

[0003] Under the influence of rotation and drilling pressure, the teeth of a roller cone drill bit crush and penetrate the rock, while simultaneously sliding and shearing it, thus fracturing the rock. As the roller cone rolls at the bottom of the well, the teeth on it impact and press into the formation in sequence. This action crushes a portion of the rock at the bottom of the well, while the shearing action caused by the sliding of the roller cone removes the remaining rock between the teeth, thus breaking up the rock at the bottom of the well and extending the wellbore. Therefore, roller cone drill bits can adapt to various formations, from soft to hard.

[0004] However, in the use of roller cone drill bits, the limited space in the downhole drive structure restricts lubricant supply. Operating in a high-pressure, high-speed environment, the seals face strong abrasion and large sealing pressure differentials, leading to poor lubrication conditions. Dry friction between the shaft and the sealing surface accelerates seal wear, thus affecting the service life of the working tool. Summary of the Invention

[0005] This application proposes a roller cone drill bit for geological exploration, which has the advantage of self-adjusting sealing after the seal wears, in order to solve the problem of lubricating oil leakage caused by the wear of the seal when it rubs against the shaft for a long time, as mentioned in the background art.

[0006] To achieve the above objectives, this application adopts the following technical solution: a rotary drill bit for geological exploration, comprising: a support frame with an installation shaft mounted at its end, the end of the installation shaft being connected to the drill bit via a bearing; a sealing sleeve, installed on the inner side of the drill bit and coaxial with the installation shaft, the inner cavity of the drill bit and the space outside the sealing sleeve communicating with the bearing portion between the installation shaft and the drill bit; a sealing pressure ring, fitted on the outer side of the sealing sleeve, the outer side fitting with the inner side of the drill bit, the inner side having an arc-shaped protrusion, the arc-shaped protrusion of the sealing pressure ring pressing the sealing sleeve, the pressed portion of the sealing sleeve adhering to the outer side of the installation shaft to form a seal; a pressure ring top spring, movably installed at one end of the sealing pressure ring, the other end being movably installed on the inner side of the drill bit; and lubricating oil being placed in the inner cavity of the drill bit.

[0007] Furthermore, the sealing sleeve is a rubber cylinder with a through-hole in the middle.

[0008] Furthermore, a lubrication branch is provided on the inner side of the drill bit, and an oil replenishment seat is fixedly connected to the tail end of the drill bit. The oil replenishment seat and the lubrication branch are connected through the oil replenishment branch.

[0009] Furthermore, the drill bit has a threaded connection at the tail end with a mounting bolt, and the sealing ring has a corresponding threaded hole.

[0010] Furthermore, an oil storage chamber is provided on the inner side of the drill bit, and the oil storage chamber is connected to the lubrication branch. An anti-backflow valve is provided at the connection between the lubrication branch and the oil storage chamber. An oil pusher plate is movably installed in the oil storage chamber. An oil pusher spring is connected between the end of the oil pusher plate and the inner side of the drill bit. An oil chamber branch is provided in the drill bit for communicating with the oil storage chamber and the oil replenishment seat.

[0011] Furthermore, it also includes: an oil sealing branch, which is installed in the drill bit, with its top communicating with the oil storage chamber and its bottom communicating with the inner cavity of the drill bit, where a pressure ring top spring is located; and another anti-backflow valve is installed between the oil sealing branch and the oil storage chamber.

[0012] Furthermore, a locking protrusion is provided on the outer side of the sealing sleeve, and a locking groove that mates with the locking protrusion is opened at the end of the sealing ring. A secondary pressure magnetic block is fixedly connected to the end of the sealing ring, and a magnetic blocking seat that blocks the secondary pressure magnetic block is movably installed at the end of the sealing ring. The end of the magnetic blocking seat extends into the locking groove. A magnetic seat spring is connected between the magnetic blocking seat and the inner side of the end of the sealing ring. A meshing magnetic ring that repels the magnetic properties of the secondary pressure magnetic block is provided in the inner cavity of the drill bit.

[0013] Furthermore, an auxiliary push collar is fitted inside the drill bit between the sealing sleeve and the mounting shaft, and a collar spring is connected between the auxiliary push collar and the mounting shaft. A main push collar, coaxial with the auxiliary push collar, is fitted inside the drill bit. A reciprocating screw is movably mounted at the end of the main push collar, and a screw top spring is connected between the reciprocating screw and the side of the mounting shaft.

[0014] Furthermore, a reciprocating groove is provided on the outer side of the reciprocating screw, a driven gear is sleeved on the outer side of the reciprocating screw, a protrusion provided on the inner side of the driven gear is placed in the reciprocating groove of the reciprocating screw, a meshing magnetic ring is fixedly connected to the end of the driven gear, a gear top spring is connected between the driven gear and the inner side of the drill bit, and a driving gear located in the inner cavity of the drill bit is fixedly connected to the end of the mounting shaft.

[0015] Furthermore, a pair of mutually repelling spaced magnets are provided at the ends of the auxiliary push ring and the main push ring.

[0016] The present invention has the following beneficial effects:

[0017] This application provides a rotary drill bit for geological exploration. Through a cylindrical sealing sleeve design, the sealing sleeve, under the pressure of a sealing ring, can be fitted tightly against the outside of the mounting shaft, thereby establishing a stable sealed connection between the drill bit and the mounting shaft. This design ensures that the internal structure of the drill bit is effectively isolated from the external environment during operation, preventing leakage of critical substances such as lubricating oil.

[0018] However, prolonged operation inevitably leads to wear on the sealing sleeve at the pressure point of the sealing ring. Once wear occurs, the total amount of lubricating oil inside the drill bit will gradually decrease. When the lubricating oil pressure drops, the elastic force of the pressure ring top spring will immediately take effect, pushing the sealing ring to switch positions on the sealing sleeve. This automatic switching process not only changes the sealing position of the sealing sleeve but also ensures that a good sealing condition is always maintained between the mounting shaft and the drill bit, thereby achieving a self-adjusting sealing effect after the seal wears. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0020] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure.

[0022] Figure 2 This is a schematic diagram of the overall internal three-dimensional structure;

[0023] Figure 3 This is a schematic diagram of the internal planar cross-sectional structure of the drill bit;

[0024] Figure 4 for Figure 3 Enlarged structural diagram at point E;

[0025] Figure 5 for Figure 3 Enlarged structural diagram at point F;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the sealing ring;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the sealing sleeve;

[0028] Figure 8 A schematic diagram of the three-dimensional structure of the main push ring;

[0029] Figure 9 This is a plan view of the side of the reciprocating lead screw.

[0030] In the diagram: 1. Mounting shaft; 100. Support frame; 2. Drill bit; 200. Oil storage chamber; 201. Oil sealing branch; 202. Lubrication branch; 3. Mounting bolt; 4. Anti-backflow valve; 5. Oil pusher plate; 500. Oil pusher spring; 6. Oil replenishment seat; 600. Oil chamber branch; 601. Oil replenishment branch; 7. Meshing magnetic ring; 8. Driven gear; 800. Gear top spring; 9. Reciprocating lead screw; 900. Lead screw top spring; 10. Driving gear; 11. Main push collar; 12. Sealing sleeve; 120. Locking protrusion; 13. Sealing pressure ring; 130. Locking groove; 14. Pressure ring top spring; 15. Auxiliary push collar; 150. Collar spring; 16. Spacing magnet; 17. Re-pressure magnetic block; 18. Magnetic stop seat; 180. Magnetic seat spring. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] Example 1

[0033] Please see Figure 1 and Figure 2 As can be seen, the improved drill bit 2 in this application has the same shape as the currently used roller cone drill bit. It is mainly equipped with a mounting shaft 1 at the end of the support frame 100. The end of the mounting shaft 1 and the drill bit 2 are fixed together by bearings. So when the support frame 100 is fixed to the drill bit drive body, generally, there are three drill bits 2 distributed on one drill bit drive body. So when the drill bit drive body rotates, the three drill bits 2 are used to break the ground to achieve the purpose of drilling.

[0034] Due to lubrication requirements, currently, a sealing ring is mainly used between the outer side of the mounting shaft 1 and the inner side of the drill bit 2. When lubricating oil is filled into the drill bit 2, it lubricates the bearings, thereby reducing the frictional resistance between the mounting shaft 1 and the drill bit 2. However, in actual application, due to the continuous rotation between the mounting shaft 1 and the drill bit 2, the rubber sealing ring is prone to wear. This allows impurities such as mud from the external environment to enter between the mounting shaft 1 and the drill bit 2, affecting their rotation and potentially causing jamming between the drill bit 2 and the mounting shaft 1. This embodiment aims to ensure a constant seal between the mounting shaft 1 and the drill bit 2, and to ensure that the seal automatically compensates for wear, thus preventing leakage. (Reference) Figure 3 , Figure 4 and Figure 6It can be clearly seen that a sealing sleeve 12 is installed on the inner side of the drill bit 2, located on the outer side of the mounting shaft 1, and the sealing sleeve 12 and the mounting shaft 1 are coaxial. The sealing sleeve 12 is a rubber cylindrical tube with a through-center. Figure 3 and Figure 5 It can be seen that one end of the sealing sleeve 12 is movably fitted inside the drill bit 2, and the other end is fixed on the drill bit 2. The inner cavity of the drill bit 2 is located outside the space of the sealing sleeve 12 and communicates with the bearing part between the mounting shaft 1 and the drill bit 2. Furthermore, a sealing pressure ring 13 is fitted on the outer side of the sealing sleeve 12. The outer side of the sealing pressure ring 13 is fitted inside the drill bit 2. An arc-shaped protrusion is provided on the inner side of the sealing pressure ring 13. When the arc-shaped protrusion of the sealing pressure ring 13 presses the sealing sleeve 12, the sealed part of the sealing sleeve 12 will stick to the outer side of the mounting shaft 1, thereby forming a seal between the mounting shaft 1 and the drill bit 2. It can be seen that when the sealing pressure ring 13 reciprocates in the axial direction of the sealing sleeve 12, it can change the sealing part of the sealing sleeve 12.

[0035] To facilitate the free movement of the sealing ring 13, a ring spring 14 is movably mounted on the end of the sealing ring 13. One end of the ring spring 14 is movably mounted on the inner side of the drill bit 2, and the end of the ring spring 14 that is relatively far from the mounting shaft 1 is engaged with... Figure 3 It can be seen that the sealing pressure ring 13 is forced to move to the right by the elastic force of the pressure ring top spring 14.

[0036] Because the interior of drill bit 2 requires the addition of an oily substance for bearing lubrication, combined with Figure 2 and Figure 3 It can be seen that a lubrication branch 202 communicating with the inner cavity of the drill bit 2 is provided on the inner side of the drill bit 2, and an oil replenishment seat 6 is fixedly connected to the tail end of the drill bit 2. The oil replenishment branch 601 connecting the oil replenishment seat 6 and the lubrication branch 202 realizes that when external lubricating oil is added through the oil replenishment seat 6, the lubricating oil flows into the inner cavity of the drill bit 2 after passing through the oil replenishment branch 601 and the lubrication branch 202. The lubricating oil is placed near the bearing, thereby reducing the frictional resistance between the mounting shaft 1 and the drill bit 2.

[0037] In the specific implementation process, combined with Figure 3 and Figure 6As can be seen, the tail end of drill bit 2 is threaded with a mounting bolt 3. The mounting bolt 3 is screwed into the threaded hole on the sealing ring 13. Based on the tension of the mounting bolt 3, the sealing ring 13 is brought close to the tail end of drill bit 2 and presses against the ring top spring 14. Then, lubricating oil is added to the oil supply seat 6. The lubricating oil is delivered to the inner cavity of drill bit 2 through the oil supply branch 601 and the lubrication branch 202 until the right side of the sealing ring 13 and the outer area of ​​the sealing sleeve 12 are filled with lubricating oil. Simultaneously, due to the gap between the mounting shaft 1 and drill bit 2 and the bearing, the lubricating oil remains on the outer side of the mounting shaft 1 and the inner side of the sealing sleeve 12 after passing through the bearing. As mentioned above, because the sealing sleeve 12 is pressed by the sealing ring 13, its pressed part adheres to the outer side of the mounting shaft 1, thus preventing the lubricating oil in the inner cavity of drill bit 2 from being output outwards. After the lubrication is completed, the restriction on the sealing ring 13 is released by tightening the mounting bolt 3.

[0038] During the operation of drill bit 2, drill bit 2 rotates around the central axis of mounting shaft 1, thereby causing sealing sleeve 12 to rotate synchronously on the outside of mounting shaft 1 and perform sealing. With prolonged rotation, leakage will occur at the wear part of sealing sleeve 12, which will lead to a decrease in the lubricating oil pressure in the inner cavity of drill bit 2. Under the elastic force of pressure ring top spring 14, it will push sealing pressure ring 13 to the right. On the one hand, the lubricating oil on the right side of sealing pressure ring 13 will be pushed into the vicinity of the bearing for replenishment. On the other hand, after sealing pressure ring 13 moves to the right, the position of sealing sleeve 12 pressed on the outside of mounting shaft 1 will change, thereby changing the sealing position.

[0039] As the mounting shaft 1 and drill bit 2 are resealed, the pressure of the lubricating oil in the inner cavity of drill bit 2 will increase again due to the push of the pressure ring top spring 14, until the sealing pressure ring 13 can no longer move to the right. At the same time, the mounting shaft 1 and drill bit 2 are resealed through the sealing sleeve 12. This cycle is repeated to ensure that the mounting shaft 1 and drill bit 2 can be automatically repaired after the seal wears down.

[0040] Example 2

[0041] Based on Embodiment 1, further improvements are made. Since the length of the sealing sleeve 12 is limited, its sealing time is also limited. This Embodiment 2 aims to extend the sealing time of the sealing sleeve 12. (See [link to previous document]). Figure 2 and Figure 3It can be seen that an oil storage chamber 200 is provided on the inner side of the drill bit 2, and the oil storage chamber 200 is connected to the lubrication branch 202. An anti-backflow valve 4 is provided at the connection between the lubrication branch 202 and the oil storage chamber 200, thereby ensuring that the medium in the oil storage chamber 200 can flow unidirectionally to the lubrication branch 202. An oil pusher plate 5 is movably installed in the oil storage chamber 200, and an oil pusher spring 500 is connected between the end of the oil pusher plate 5 and the inner side of the drill bit 2. The elastic force of the oil pusher spring 500 keeps the medium in the oil storage chamber 200 from flowing into the lubrication branch 202. The material always tends to be squeezed into the lubrication branch 202. It should be noted that the elastic force of the push spring 500 is less than that of the pressure ring top spring 14, so as to avoid the phenomenon that the sealing pressure ring 13 is not easy to move due to excessive input pressure in the oil storage chamber 200. For the replenishment of lubricating oil in the oil storage chamber 200, an oil chamber branch 600 is provided in the drill bit 2 for communicating with the oil storage chamber 200 and the oil replenishment seat 6. Thus, the lubricating oil added by the oil replenishment seat 6 can be input into the oil storage chamber 200 after being transported through the oil chamber branch 600.

[0042] Combination Figure 3 It is evident that the oil storage chamber 200 and the inner cavity of the drill bit 2 containing the pressure ring top spring 14 are connected via the oil sealing branch 201. Furthermore, the connection between the oil sealing branch 201 and the oil storage chamber 200 is equipped with a one-way anti-reverse valve 4 that allows the oil storage chamber 200 to flow into the oil sealing branch 201. This ensures that when the sealing pressure ring 13 is pushed to the right, the space inside the drill bit 2 on the left side of the sealing pressure ring 13 can be replenished with lubricating oil via the oil sealing branch 201, facilitating the subsequent resealing of the sealing sleeve 12.

[0043] A locking protrusion 120 is provided on the outer side of the sealing sleeve 12, relatively away from the pressure ring top spring 14. As can be seen from the engaging magnetic ring 7 in the figure, the cross-sectional shape of the locking protrusion 120 is a right-angled triangle. Figure 4 and Figure 6 As can be seen, the end of the sealing ring 13 is provided with a locking groove 130 that cooperates with the locking protrusion 120. Since the opening at the end of the sealing ring 13 is smaller than the extension length of the locking protrusion 120, the locking protrusion 120 will be pre-pressed by the end of the sealing ring 13 when the locking groove 130 passes over the locking protrusion 120. Since the locking protrusion 120 is made of rubber, it has a certain elasticity and can be easily squeezed. After the end of the sealing ring 13 completely squeezes and passes over the locking protrusion 120, it will be stretched open in the locking groove 130 by the elastic force of the locking protrusion 120 itself, thereby ensuring that the locking protrusion 120 is completely stuck in the locking groove 130.

[0044] A secondary pressure magnetic block 17 located outside the locking groove 130 is fixedly connected to the end of the sealing ring 13. A magnetic blocking seat 18 is movably installed at the end of the sealing ring 13 to block the secondary pressure magnetic block 17, and the end of the magnetic blocking seat 18 extends into the locking groove 130. When the locking protrusion 120 is fully inserted into the locking groove 130, it will push the magnetic blocking seat 18 through the locking protrusion 120, thereby exposing the secondary pressure magnetic block 17 installed at the end of the sealing ring 13. A magnetic seat spring 180 is connected between the magnetic blocking seat 18 and the inner side of the end of the sealing ring 13, so that the spring force of the magnetic seat spring 180 can be used to... The end of the magnetic stop 18 always tends to extend out of the locking groove 130, which ensures that the magnetic stop 18 always blocks the pressure block 17 under normal conditions. The specific reason is that the inner cavity of the drill bit 2 is provided with a meshing magnetic ring 7 that is magnetically repulsive to the pressure block 17. Therefore, during the blocking process of the magnetic stop 18, no magnetic repulsion will occur between the pressure block 17 and the meshing magnetic ring 7. When the locking protrusion 120 enters the locking groove 130 and pushes the magnetic stop 18, the magnetic surfaces of the pressure block 17 and the meshing magnetic ring 7 will face each other. In this way, the magnetic repulsion will cause the sealing ring 13 to tend to move towards the ring top spring 14.

[0045] In specific implementation, the method of filling the inner cavity of drill bit 2 with lubricating oil is the same as described above. As the sealing sleeve 12 wears, the sealing pressure ring 13 will be pushed to the right by the elastic force of the pressure ring top spring 14, which will cause the sealing pressure ring 13 to gradually move closer to the locking protrusion 120. During this process, since the sealing pressure ring 13 moves from the left end to the right end of the sealing sleeve 12, it means that the sealing sleeve 12 is pushed outward by the sealing pressure ring 13, and the inner side of the sealing sleeve 12 has completed a sealing process.

[0046] When the sealing ring 13 moves to the right under the force of the ring top spring 14, the lubricating oil in the oil storage chamber 200 enters the drill bit 2 cavity on the left side of the sealing ring 13. As the sealing ring 13 continues to move to the right, the lubricating oil in the oil storage chamber 200 is continuously supplied to it. Finally, when the sealing ring 13 approaches and passes the locking protrusion 120, the locking protrusion 120 will be engaged in the locking groove 130, and the pushing of the locking protrusion 120 will cause the magnetic stop seat 18 to compress the magnetic seat spring 180. The magnetic surfaces of the compound magnetic block 17 and the meshing magnetic ring 7 generate a repulsive magnetic force. Under the action of magnetic repulsion, the sealing ring 13 tends to move towards the ring top spring 14. Since there is sufficient lubricating oil in the inner cavity of the drill bit 2 on the left side of the sealing ring 13, when the sealing ring 13 is pushed to the left, due to the incompressible nature of the lubricating oil, the hydraulic oil will push the sealing sleeve 12 to expand inward. In this way, the inner side of the sealing sleeve 12 will be attached to the outer side of the mounting shaft 1 again, forming a secondary sealing process.

[0047] Because the locking protrusion 120 is engaged in the locking groove 130, it further prevents the left and right end chambers of the sealing ring 13 from communicating. Simultaneously, combined with... Figure 3 and Figure 7 It can be seen that the end of the sealing sleeve 12 located on the locking protrusion 120 has a relatively small thickness. This thinner end is fitted onto the drill bit 2. When the sealing ring 13 passes over the locking protrusion 120, the arc-shaped protrusion of the sealing ring 13 also presses the sealing sleeve 12 against the inside of the drill bit 2. Since the end of the sealing sleeve 12 of the locking protrusion 120 is fitted onto the drill bit 2, when the sealing ring 13 pushes the sealing sleeve 12 to the left through the locking protrusion 120, the sealing sleeve 12 is squeezed by the drill bit 2 and the arc-shaped protrusion, further ensuring that the chambers at the left and right ends of the sealing ring 13 do not communicate with each other.

[0048] Example 3

[0049] A further improvement based on Embodiment 2: When the sealing sleeve 12 expands inward, it will completely adhere to the mounting shaft 1. While this ensures a seal, excessive contact increases friction between the two and leads to increased unused sealing, resulting in unnecessary wear of the sealing sleeve 12. To address this issue, please refer to... Figure 3 It can be seen that an auxiliary push ring 15 is fitted inside the drill bit 2, located between the sealing sleeve 12 and the mounting shaft 1. A collar spring 150 connects the auxiliary push ring 15 and the inner end of the mounting shaft 1. The collar spring 150 pushes the auxiliary push ring 15 towards the tip of the drill bit 2. In practical application, as the sealing ring 13 moves to the right, the auxiliary push ring 15, pushed by the collar spring 150, moves towards the sealing ring 13. However, the auxiliary push ring 15 will not pass over the sealing ring 13 because the sealing sleeve 12 is pressed against the outer side of the mounting shaft 1 by the sealing ring 13, thus blocking the movement of the auxiliary push ring 15. When the sealing ring 13 moves to the right, lubricating oil fills the inner cavity of the drill bit 2 on the left side of the sealing ring 13. The auxiliary push ring 15 prevents the lubricating oil from entering the inner side of the sealing ring 13, thus avoiding the flow of lubricating oil. The sealing sleeve 12 is in direct contact with the mounting shaft 1, reducing wear on the sealing sleeve 12. On the other hand, the extension length of the auxiliary push ring 15 is fixed. When the sealing pressure ring 13 reaches the locking protrusion 120, the auxiliary push ring 15 is fully extended. However, at this time, the extension length of the auxiliary push ring 15 cannot completely cover the inner side of the sealing sleeve 12. When the sealing sleeve 12 is squeezed inward by the lubricating oil, the inner part of the sealing sleeve 12 is covered by the auxiliary push ring 15, and the sealing sleeve 12 at the end of the auxiliary push ring 15 will expand outward and press against the mounting shaft 1, thereby achieving a re-sealing between the mounting shaft 1 and the drill bit 2.

[0050] Based on this, a main thrust collar 11, coaxial with the auxiliary thrust collar 15, is fitted inside the drill bit 2, combined with... Figure 3 , Figure 5 and Figure 8 It can be seen that a reciprocating screw 9 is movably mounted at the end of the main push collar 11, and one end of the reciprocating screw 9 is movably mounted inside the head end of the drill bit 2. A screw top spring 900 is connected between the reciprocating screw 9 and the head end of the mounting shaft 1. Thus, the elastic force of the screw top spring 900 makes the main push collar 11 always tend to push towards the auxiliary push collar 15. This ensures that during application, the auxiliary push collar 15 blocks the sealing sleeve 12 on the left side of the sealing pressure ring 13, and the main push collar 11 blocks the sealing sleeve 12 on the right side of the sealing pressure ring 13. This ensures that when the sealing pressure ring 13 squeezes the sealing sleeve 12 to seal, the sealing sleeves 12 in other parts will not come into contact with the mounting shaft 1, thereby avoiding unnecessary wear.

[0051] from Figure 3 and Figure 9 It can be seen that a reciprocating groove is provided on the outer side of the reciprocating screw 9, and a driven gear 8 is provided on the outer side of the reciprocating screw 9. The protrusion provided on the inner side of the driven gear 8 is placed in the reciprocating groove of the reciprocating screw 9. Thus, when the driven gear 8 moves, the reciprocating screw 9 moves back and forth by the movement of the protrusion on the driven gear 8 in the reciprocating groove. The meshing magnetic ring 7 is fixedly connected to the end of the driven gear 8, and a gear top spring 800 is connected between the driven gear 8 and the inner side of the first end of the drill bit 2. The end of the mounting shaft 1 is fixedly connected to the driving gear 10 located in the inner cavity of the drill bit 2. Under normal conditions, the driven gear 8 and the driving gear 10 are disengaged by the elastic force of the gear top spring 800.

[0052] Combination Figure 4 It can be seen that the auxiliary push ring 15 and the main push ring 11 are provided with a pair of mutually repulsive gap magnets 16 at their ends. The magnetic repulsion of the gap magnets 16 ensures that there is always a certain gap between the auxiliary push ring 15 and the main push ring 11, so as to avoid the end of the auxiliary push ring 15 and the main push ring 11 from sticking together, which would prevent the sealing sleeve 12 from expanding outward normally.

[0053] In practical applications, when the sealing ring 13 is located to the left of the sealing sleeve 12, the auxiliary push ring 15 is also located to the left of the sealing sleeve 12, while the main push ring 11 is pushed to the right of the sealing ring 13 by the screw spring 900. The sealing sleeve 12 pressed by the sealing ring 13 is pushed against the outside of the mounting shaft 1 to achieve sealing. As the sealing ring 13 moves to the right, the main push ring 11 is forced to push to the right and compress the screw spring 900. The presence of the gear spring 800 causes the driven gear 8 to not mesh with the driving gear 10 when the reciprocating screw 9 moves to the right. As the sealing ring 13 continues to move to the right, it continues until the sealing ring 13 passes the locking protrusion 120. At this time, the auxiliary push ring 15 is restricted from extending and will not completely cover the sealing sleeve 12. Combined with the pair of magnetically repulsive spacers 16 provided between the auxiliary push ring 15 and the main push ring 11, the auxiliary push ring 15 and the main push ring 11 will not be closed by elastic force, and a certain length is reserved for the sealing sleeve 12 to expand outward.

[0054] When the sealing sleeve 12 is completely worn by the pushing of the sealing pressure ring 13, the sealing pressure ring 13 passes over the locking protrusion 120, causing the repressing magnetic block 17 and the meshing magnetic ring 7 to repel each other magnetically. At this time, under the action of magnetic repulsion, the sealing pressure ring 13 tends to move towards the pressure ring top spring 14. At the same time, the driven gear 8 meshes with the driving gear 10 due to magnetic repulsion. As the drill bit 2 moves, the driven gear 8 will also rotate synchronously due to meshing with the driving gear 10. During the rotation, the reciprocating screw 9 will move back and forth.

[0055] Specifically, when the reciprocating screw 9 moves to the left, it pushes the main push ring 11 to the left. Since the extended portion of the sealing sleeve 12 is located between the auxiliary push ring 15 and the main push ring 11, when the main push ring 11 compresses the extended portion, due to the incompressible nature of the lubricating oil, the sealing sleeve 12 near the end of the auxiliary push ring 15 will expand outwards, simultaneously pushing the auxiliary push ring 15 to compress the ring spring 150, until the reciprocating screw 9 extends to its left limit; as the driven gear 8... As the screw rotates continuously, it pulls the reciprocating screw 9 to the right. Similarly, when the reciprocating screw 9 pulls the main push ring 11 to the right, the distance between the auxiliary push ring 15 and the main push ring 11 increases as the main push ring 11 moves further away. The auxiliary push ring 15, under the elastic force of the ring spring 150, tends to move towards the main push ring 11. This keeps the distance between the auxiliary push ring 15 and the main push ring 11 constant, ensuring that the sealing sleeve 12 always expands outward for sealing.

[0056] In summary, by reciprocating left and right at a fixed interval between the auxiliary push ring 15 and the main push ring 11, the outwardly expanding sealing sleeve 12 is partially sealed, which reduces the friction of the seal and extends the service life of the sealing sleeve 12 after it expands.

Claims

1. A roller cone drill bit for geological exploration, characterized in that, include: The support frame (100) has a mounting shaft (1) installed at its end, and the end of the mounting shaft (1) is connected to the drill bit (2) by a bearing; A sealing sleeve (12) is installed on the inner side of the drill bit (2) and coaxial with the mounting shaft (1). The inner cavity of the drill bit (2) and the space outside the sealing sleeve (12) are connected to the bearing part between the mounting shaft (1) and the drill bit (2). The sealing ring (13) is fitted on the outside of the sealing sleeve (12), and the outside is fitted with the inside of the drill bit (2). The inside is provided with an arc-shaped protrusion. The arc-shaped protrusion of the sealing ring (13) presses the sealing sleeve (12), and the sealed sleeve (12) of the pressed part will stick to the outside of the mounting shaft (1) to form a seal. The pressure ring top spring (14) is movably installed at one end of the sealing pressure ring (13), and the other end is movably installed on the inside of the drill bit (2); The inner cavity of the drill bit (2) is filled with lubricating oil.

2. The rotary drill bit for geological exploration according to claim 1, characterized in that, The sealing sleeve (12) is a rubber cylindrical tube with a through-hole in the middle.

3. The rotary drill bit for geological exploration according to claim 1, characterized in that, The drill bit (2) has a lubrication branch (202) on its inner side, and the tail end of the drill bit (2) is fixedly connected to an oil replenishment seat (6). The oil replenishment seat (6) and the lubrication branch (202) are connected through the oil replenishment branch (601).

4. The rotary drill bit for geological exploration according to claim 1, characterized in that, The tail end of the drill bit (2) is threaded with a mounting bolt (3), and the sealing ring (13) has a corresponding threaded hole.

5. The rotary drill bit for geological exploration according to claim 3, characterized in that, The drill bit (2) has an oil storage chamber (200) on its inner side, and the oil storage chamber (200) is connected to the lubrication branch (202). An anti-backflow valve (4) is provided at the connection between the lubrication branch (202) and the oil storage chamber (200). An oil pusher plate (5) is movably installed in the oil storage chamber (200). An oil pusher spring (500) is connected between the end of the oil pusher plate (5) and the inner side of the drill bit (2). The drill bit (2) has an oil chamber branch (600) for communicating with the oil storage chamber (200) and the oil replenishment seat (6).

6. The rotary drill bit for geological exploration according to claim 5, characterized in that, It also includes: The sealing branch (201) is set in the drill bit (2), with its top communicating with the oil storage chamber (200) and its bottom communicating with the inner cavity of the drill bit (2), in which a pressure ring top spring (14) is present; Another anti-backflow valve (4) is installed between the oil sealing branch (201) and the oil storage chamber (200).

7. The rotary drill bit for geological exploration according to claim 6, characterized in that, A locking protrusion (120) is provided on the outer side of the sealing sleeve (12), and a locking groove (130) that cooperates with the locking protrusion (120) is provided at the end of the sealing ring (13). A repressing magnetic block (17) is fixedly connected to the end of the sealing ring (13), and a magnetic blocking seat (18) that blocks the repressing magnetic block (17) is movably installed at the end of the sealing ring (13). The end of the magnetic blocking seat (18) extends into the locking groove (130), and a magnetic seat spring (180) is connected between the magnetic blocking seat (18) and the inner side of the end of the sealing ring (13). A meshing magnetic ring (7) that is magnetically repulsive to the repressing magnetic block (17) is provided in the inner cavity of the drill bit (2).

8. The rotary drill bit for geological exploration according to claim 7, characterized in that, The inner side of the drill bit (2) is fitted with an auxiliary push collar (15) located between the sealing sleeve (12) and the mounting shaft (1), and a collar spring (150) is connected between the auxiliary push collar (15) and the mounting shaft (1). The inner side of the drill bit (2) is fitted with a main push collar (11) coaxial with the auxiliary push collar (15). A reciprocating screw (9) is movably mounted at the end of the main push collar (11), and a screw top spring (900) is connected between the reciprocating screw (9) and the side of the mounting shaft (1).

9. The rotary drill bit for geological exploration according to claim 8, characterized in that, A reciprocating groove is provided on the outer side of the reciprocating screw (9), and a driven gear (8) is sleeved on the outer side of the reciprocating screw (9). A protrusion provided on the inner side of the driven gear (8) is placed in the reciprocating groove of the reciprocating screw (9). A meshing magnetic ring (7) is fixedly connected to the end of the driven gear (8). A gear top spring (800) is connected between the driven gear (8) and the inner side of the drill bit (2). The end of the mounting shaft (1) is fixedly connected to the driving gear (10) located in the inner cavity of the drill bit (2).

10. The rotary drill bit for geological exploration according to claim 9, characterized in that, The auxiliary push ring (15) and the main push ring (11) are provided with a pair of mutually repelling spaced magnets (16) at their ends.

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