An autonomous orientation device

Abstract

The present invention relates to the field of drilling deflection correction and deflection creation, and discloses an autonomous orientation device, comprising: a wedge; a counterweight structure arranged on the wedge; a rotating shaft body, the first end of which extends into the interior of the wedge and is threadedly connected to the inner wall of the wedge; a connecting sleeve body, the wedge body, the connecting sleeve body, and the rotating shaft body being coaxially arranged, the second end of the rotating shaft body extending into the interior of the connecting sleeve body; an intermediate sleeve arranged inside the connecting sleeve body and rotating synchronously with the connecting sleeve body, which is rotatably sleeved on the rotating shaft body; a limiting structure for limiting the rotating shaft body from being dislodged from the intermediate sleeve; one of the connecting sleeve body and the rotating shaft body being provided with a transmission key, and the other being provided with a keyway matching the transmission key, and when in a first position, the transmission key and the keyway are separated from each other, and when in a second position, the transmission key is arranged in the keyway. The autonomous orientation device can autonomously orient, has low production investment, and is simple to operate.

Description

Technical Field

[0001] The invention relates to the field of drilling deflection correction and deflection creation, and in particular to an autonomous orientation device. Background Art

[0002] Eccentric wedges are mainly used for directional drilling in various drilling projects such as solid mineral exploration. They can be widely used in directional drilling and directional obstacle avoidance construction in solid mineral exploration, hydrogeological surveys, water well geothermal well construction, oil and gas resource exploration and development, as well as coal, metallurgy, nuclear industry and other fields.

[0003] The existing eccentric wedges mainly have the following defects:

[0004] 1. Unable to orient itself, and requires the help of special orientation equipment;

[0005] 2. As attached Figure 8 As shown, a sleeve is provided at the upper end of the existing eccentric wedge. During directional drilling, the sleeve is connected to the drill rod, and the directional drill rod and drill bit pass through the original drill rod and sleeve to perform directional work. After the directional drilling is completed, the eccentric wedge is taken out, and the original drill bit and drill rod are replaced to expand the hole first and then resume normal drilling. Using the existing eccentric wedge for directional drilling requires preparing two levels of drill bits and drill rods, which leads to large production investment. In addition, after the directional drilling is completed, the hole needs to be expanded before drilling, and the operation is complicated.

[0006] Therefore, how to overcome the above-mentioned defects has become a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides an autonomous orientation device which can autonomously orient, requires little production investment, and is easy to operate.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides an autonomous orientation device, comprising: a wedge; a counterweight structure, wherein the counterweight structure is arranged on the wedge; a rotating shaft body, wherein the rotating shaft body is coaxially arranged with the wedge, the first end of the rotating shaft body extends into the interior of the wedge and is threadedly connected to the inner wall of the wedge; a connecting sleeve body, wherein the connecting sleeve body is coaxially arranged with the rotating shaft body, the first end of the connecting sleeve body is used to connect with the drill rod, and the second end of the rotating shaft body extends from the second end of the connecting sleeve body into the interior of the connecting sleeve body; an intermediate sleeve, wherein the intermediate sleeve is arranged inside the connecting sleeve body, and the intermediate sleeve The sleeve rotates synchronously with the connecting sleeve body, and the intermediate sleeve is rotatably sleeved on the rotating shaft body; a limiting structure, the limiting structure is arranged at the second end of the rotating shaft body, and the limiting structure is used to limit the intermediate sleeve from being separated from the rotating shaft body from the second end of the rotating shaft body; one of the connecting sleeve body and the rotating shaft body is provided with a transmission key, and the other is provided with a keyway matching the transmission key, and when the transmission key is in the first position, the transmission key and the keyway are separated from each other, and when the transmission key is in the second position, the transmission key is arranged in the keyway.

[0010] Preferably, the autonomous orientation device also includes two bearings, the connecting sleeve body includes a connecting joint and a bearing sleeve, the first end of the connecting joint is used to connect to the drill rod, and the second end of the connecting joint is connected to the bearing sleeve, the two bearings are respectively arranged at the two ends of the intermediate sleeve, each of the bearings is sleeved on the rotating shaft body, the bearing sleeve is coaxially arranged with the rotating shaft body, and the bearing sleeve is nested outside the intermediate sleeve so that the bearing sleeve and the intermediate sleeve can rotate synchronously.

[0011] Preferably, the autonomous orienting device also includes an elastic member, and the first end of the bearing close to the limiting structure is abutted against the first end of the bearing sleeve. When the transmission key is in the first position, the second end of the bearing close to the limiting structure is abutted against the limiting structure. When the transmission key is in the second position, the second end of the bearing close to the limiting structure is separated from the limiting structure. A first step surface is provided inside the bearing sleeve, and a second step surface is provided on the rotating shaft body. The first end of the bearing away from the limiting structure is abutted against the first step surface, and the second end is abutted against the first end of the elastic member, and the second end of the elastic member is abutted against the second step surface.

[0012] Preferably, the autonomous orienting device also includes an oil cup for lubricating the two bearings. The oil cup is arranged inside the connecting sleeve, and the axis of the oil cup coincides with the axis of the connecting sleeve. A plurality of oil grooves are evenly arranged around the circumference of the rotating shaft body. Each of the oil grooves is arranged along the axial direction of the rotating shaft body, and the first end of each of the oil grooves is flush with the second end of the rotating shaft body. The second end of each of the oil grooves extends at least to the bearing away from the limiting structure, and each of the oil grooves is connected to the oil cup.

[0013] Preferably, the autonomous orienting device also includes a mounting structure, which divides the interior of the connecting joint into a first cavity and a second cavity that are independent of each other, the second end of the rotating shaft body extends into the second cavity, and the connecting sleeve body is circumferentially provided with a plurality of openings, each of which is connected to the first cavity, the oil cup is arranged on the mounting structure, and the oil inlet end and the oil outlet end of the oil cup are respectively arranged in the first cavity and the second cavity.

[0014] Preferably, the rotating shaft body includes a connecting shaft and a connecting cylinder, the first end of the connecting cylinder is threadedly connected to the first end of the connecting shaft, the second end of the connecting shaft is provided with the limiting structure, the second end of the connecting cylinder is threadedly connected to the inner wall of the wedge, and the threads at both ends of the connecting cylinder have opposite rotation directions.

[0015] Preferably, a plurality of claws are circumferentially provided on one end of the wedge away from the rotating shaft.

[0016] Preferably, a plurality of guide grooves are provided inside the wedge body, and each of the guide grooves is provided along the axial direction of the wedge body. A guide block is provided on the counterweight structure, and the guide block is slidably connected to each of the guide grooves.

[0017] Preferably, the elastic member is a spring.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The autonomous orientation device provided by the present invention comprises: a wedge; a counterweight structure, which is arranged on the wedge; a rotating shaft body, which is coaxially arranged with the wedge, and the first end of the rotating shaft body extends into the interior of the wedge and is threadedly connected to the inner wall of the wedge; a connecting sleeve body, which is coaxially arranged with the rotating shaft body, the first end of the connecting sleeve body is used to connect with the drill pipe, and the second end of the rotating shaft body extends from the second end of the connecting sleeve body into the interior of the connecting sleeve body; an intermediate sleeve, which is arranged inside the connecting sleeve body and rotates synchronously with the connecting sleeve body, and the intermediate sleeve is rotatably sleeved on the connecting sleeve body. On the rotating shaft body; a limiting structure, the limiting structure is arranged at the second end of the rotating shaft body, and the limiting structure is used to limit the rotating shaft body from escaping from the intermediate sleeve; an elastic member, the first end and the second end of the elastic member are respectively connected to the rotating shaft body and the connecting sleeve body, one of the connecting sleeve body and the rotating shaft body is provided with a transmission key, and the other is provided with a key slot matching the transmission key, and when the transmission key is in the first position, the transmission key and the key slot are separated from each other, when the transmission key is in the second position, the transmission key is arranged in the key slot, and the elastic member is used to drive the transmission key to move from the second position to the first position.

[0020] During the lowering process of this autonomous directional drilling device, the wedge does not rotate with the drill pipe; it rotates freely. After reaching the hole bottom under the action of the counterweight structure, the wedge's guiding bevel maintains the preset azimuth angle, thereby achieving autonomous directional drilling. After lowering to the hole bottom, drilling pressure is applied through the drill pipe, causing the wedge to sink into the hole bottom. Simultaneously, a drive key is set in the keyway. At this point, the drill rig is activated on the surface to rotate the drill pipe, disengaging the threads between the first end of the rotating shaft and the inner wall of the wedge. The wedge separates from the rotating shaft, and the drill pipe is lifted, leaving the wedge at the hole bottom. Directional drilling is then performed using its guiding bevel. Furthermore, since a sleeve is not required and the directional drill pipe is lifted before directional drilling, there is no need to replace a smaller drill pipe and drill bit during directional drilling. The drill bit can be directly installed on the directional drill pipe, allowing directional drilling to be performed using the existing drill pipe and drill bit. This eliminates the need for preparing both large and small drill pipes and drill bits, effectively reducing production costs. Furthermore, the autonomous directional drilling device eliminates the need for reaming and allows for direct drilling, resulting in simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of an autonomous orientation device provided in an embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of the autonomous orientation device provided in an embodiment of the present invention in a lowered state;

[0024] Figure 3 A cross-sectional view of the autonomous orientation device provided in an embodiment of the present invention when lowered to the bottom of a hole;

[0025] Figure 4 A cross-sectional view of a bearing sleeve of an autonomous orientation device provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the connecting shaft of the autonomous orientation device provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic structural diagram of a wedge of an autonomous orientation device provided in an embodiment of the present invention;

[0028] Figure 7 A schematic structural diagram of a guide block of an autonomous orientation device provided in an embodiment of the present invention;

[0029] Figure 1-Figure 7 Explanation of the accompanying drawings: 100, autonomous orienting device; 1, wedge; 101, upper structure; 1011, guide slope; 102, lower structure; 1021, guide groove; 2, counterweight structure; 201, guide block; 3, rotating shaft body; 301, connecting shaft; 3011, keyway; 3012, second step surface; 3013, oil groove; 302, connecting cylinder; 4, connecting sleeve body; 401, connecting joint; 4011, opening; 402, bearing sleeve; 4021, transmission key; 4022, first step surface; 5, intermediate sleeve; 6, limiting structure; 7, elastic member; 8, bearing; 9, oil cup; 10, mounting structure; 11, claw; 12, washer; 13, drill pipe.

[0030] Figure 8 Schematic diagram of the structure of the existing wedge.

[0031] Figure 8 Description of the accompanying drawings: 30, wedge; 31, sleeve. DETAILED DESCRIPTION

[0032] 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.

[0033] The purpose of the present invention is to provide an autonomous orientation device which can orient itself, has low production investment and is easy to operate.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] refer to Figure 1-Figure 7 As shown, the autonomous orientation device 100 provided in this embodiment includes: a wedge 1; a counterweight structure 2, the counterweight structure 2 is arranged on the wedge 1; a rotating shaft body 3, the rotating shaft body 3 is coaxially arranged with the wedge 1, the first end of the rotating shaft body 3 extends into the interior of the wedge 1 and is threadedly connected to the inner wall of the wedge 1; a connecting sleeve 4, the connecting sleeve 4 is coaxially arranged with the rotating shaft body 3, the first end of the connecting sleeve 4 is used to connect with the drill pipe 13, and the second end of the rotating shaft body 3 extends from the second end of the connecting sleeve 4 into the interior of the connecting sleeve 4; an intermediate sleeve 5, the intermediate sleeve 5 is arranged inside the connecting sleeve 4, and the intermediate sleeve 5 is connected to the connecting sleeve 4. The connecting sleeve body 4 rotates synchronously, and the intermediate sleeve 5 is rotatably mounted on the rotating shaft body 3. A limiting structure 6 is provided at the second end of the rotating shaft body 3 and is used to prevent the rotating shaft body from being dislodged from the intermediate sleeve. One of the connecting sleeve body 4 and the rotating shaft body 3 is provided with a transmission key 4021, and the other is provided with a key slot 3011 that cooperates with the transmission key 4021. When the transmission key 4021 is in a first position, the transmission key 4021 and the key slot 3011 are separated from each other. When the transmission key 4021 is in a second position, the transmission key 4021 is disposed in the key slot 3011. This autonomous orientation device 100 not only enables autonomous orientation, but also has the characteristics of low production investment and simple operation.

[0036] In this embodiment, in order to reduce friction, Figure 2-Figure 3 As shown, the autonomous orientation device 100 also includes two bearings 8. The connecting sleeve 4 includes a connecting joint 401 and a bearing sleeve 402. The first end of the connecting joint 401 is used to connect to the drill pipe 13, and the second end of the connecting joint 401 is connected to the bearing sleeve 402. The two bearings 8 are respectively disposed at both ends of the intermediate sleeve 5. Each bearing 8 is sleeved on the rotating shaft body 3. The bearing sleeve 402 is coaxially arranged with the rotating shaft body 3 and nested outside the intermediate sleeve 5 to enable the bearing sleeve 402 and the intermediate sleeve 5 to rotate synchronously. Specifically, in this embodiment, the bearing sleeve 402 and the intermediate sleeve 5 have an interference fit.

[0037] In this embodiment, if Figure 2-Figure 3As shown, the autonomous orienting device also includes an elastic member 7. The first end of the bearing 8 close to the limiting structure 6 is abutted against the first end of the bearing sleeve 402. When the transmission key 4021 is in the first position, the second end of the bearing 8 close to the limiting structure 6 is abutted against the limiting structure 6. When the transmission key 4021 is in the second position, the second end of the bearing 8 close to the limiting structure 6 is separated from the limiting structure 6. A first step surface 4022 is provided inside the bearing sleeve 402, and a second step surface 3012 is provided on the rotating shaft body 3. The first end of the bearing 8 away from the limiting structure 6 is abutted against the first step surface 4022 and the second end is abutted against the first end of the elastic member 7. The second end of the elastic member 7 is abutted against the second step surface 3012.

[0038] In this embodiment, if Figure 2-Figure 3 As shown, the autonomous orientation device 100 also includes an oil cup 9 for lubricating the two bearings 8. The oil cup 9 is disposed within the connecting sleeve 4, with the axis of the oil cup 9 coinciding with the axis of the connecting sleeve 4. Multiple oil grooves 3013 are evenly distributed around the circumference of the rotating shaft 3. Each oil groove 3013 is arranged along the axis of the rotating shaft 3, and the first end of each oil groove 3013 is flush with the second end of the rotating shaft 3. The second end of each oil groove 3013 extends at least to the bearing 8 away from the retaining structure 6 to ensure lubrication of both bearings 89. Each oil groove 3013 is connected to the oil cup 9. The specific structure of the oil cup 9 is prior art and will not be further described here. In this embodiment, specifically, the second end of each oil groove 3013 extends to the second step surface 3012. During use, lubricant enters the oil groove 3013 through the oil cup 9 and flows along the oil groove 3013, completing lubrication of the two bearings 8 as it flows through the two bearings 8.

[0039] In this embodiment, if Figure 2-Figure 3 As shown, the autonomous orientation device 100 also includes a mounting structure 10, which divides the interior of the connecting joint 401 into a first cavity and a second cavity, each of which is independent of the other. The second end of the rotating shaft 3 extends into the second cavity. The connecting sleeve 4 is provided with multiple openings 4011 circumferentially, each of which communicates with the first cavity. The oil cup 9 is mounted on the mounting structure 10, with the oil inlet and outlet ends of the oil cup 9 respectively disposed in the first cavity and the second cavity. During use, the openings 4011 communicate with the external annular drilling fluid, achieving pressure balance between the interior and exterior of the drill pipe 13 during drilling. Furthermore, the mounting structure 10 is specifically a mounting plate.

[0040] In this embodiment, if Figure 2-Figure 3 As shown, the limiting structure 6 is two nuts, each of which is threadedly connected to the rotating shaft body 3.

[0041] Further, if Figure 2-Figure 3 As shown, a washer 12 is provided between the two nuts and the bearings 89 adjacent to the two nuts.

[0042] In this embodiment, if Figure 2-Figure 3 As shown, the rotating shaft body 3 includes a connecting shaft 301 and a connecting cylinder 302. The first end of the connecting cylinder 302 is threadedly connected to the first end of the connecting shaft 301, and the second end of the connecting shaft 301 is provided with a limiting structure 6. The second end of the connecting cylinder 302 is threadedly connected to the inner wall of the wedge 1, and the threads at both ends of the connecting cylinder 302 are in opposite directions. If the connecting shaft 301 is directly connected to the wedge 1, the connecting shaft 301 is a solid structure and is heavy. By using a hollow connecting cylinder 302 to connect to the wedge 1, the weight of the autonomous orientation device 100 is effectively reduced. Furthermore, the first end of the connecting cylinder is provided with a right-handed thread, and the second end of the connecting cylinder 302 is provided with a left-handed thread. During specific use, the connecting cylinder 302 can be disengaged from the wedge 1 by rotating it in the forward direction, that is, by rotating the drill rod 13 in the right direction.

[0043] Specifically, in this embodiment, the first end of the connecting joint 401 is threadedly connected to the drill rod 13, and the second end of the connecting joint is threadedly connected to the bearing sleeve 402. The thread rotation direction at the connection point between the connecting joint 401 and the drill rod 13 and the thread rotation direction at the connection point between the connecting joint 401 and the bearing sleeve 402 are both the same as the thread rotation direction of the first end of the connecting tube 302. Furthermore, the thread rotation direction at the connection point between the connecting joint 401 and the drill rod 13 and the thread rotation direction at the connection point between the connecting joint 401 and the bearing sleeve 402 are both right-hand.

[0044] In this embodiment, the structure of the wedge 1 is substantially the same as that of the conventional wedge 1, except that Figure 6 As shown, the wedge body 1 provided by the present invention does not include a sleeve. To facilitate threading on the inner wall of the wedge body 1, the wedge body 1 provided by the present invention is divided into two parts at the connection point between the connecting tube 302 and the wedge body 1, forming an upper structure 101 and a lower structure 102. Furthermore, the upper structure 101 and the lower structure 102 are connected by threads, and the thread rotation direction is the same as the thread rotation direction of the first end of the connecting tube 302. A guide slope 1011 is provided on the upper structure 101. Furthermore, the thread rotation direction at the connection point between the upper structure 101 and the lower structure 102 is right-hand.

[0045] In this embodiment, if Figure 1-Figure 3 As shown, a plurality of claws 11 are provided circumferentially on one end of the wedge 1 away from the rotating shaft 3. By providing the claws 11, the wedge 1 can be easily and quickly engaged with the bottom of the hole. Furthermore, the claws 11 are provided on the end of the lower structure 102 away from the upper structure 101.

[0046] In this embodiment, if Figure 6As shown, the wedge body 1 is provided with a plurality of guide grooves 1021, each of which is arranged along the axis of the wedge body 1. The counterweight structure 2 is provided with a guide block 201, which is slidably connected to each guide groove 1021. During actual use, the number of counterweight structures 2 is determined according to actual needs, and the counterweight structures 2 are installed in the same or different guide grooves 1021 as needed.

[0047] Further, if Figure 6 As shown, a guide groove 1021 is provided inside the lower structure 102 .

[0048] In this embodiment, if Figure 6-Figure 7 As shown, the counterweight structure 2 is specifically a counterweight block, the guide groove 1021 is specifically a dovetail groove, and the guide block 201 is specifically a dovetail block.

[0049] In this embodiment, the elastic member 7 is a spring.

[0050] like Figure 2-Figure 3 As shown, during the lowering process, the connection joint 401, intermediate sleeve 5, and bearing sleeve 402 remain aligned with the drill pipe 13. The connecting shaft 301, connecting tube 302, and wedge 1 are freely rotatable and, under the action of gravity, do not rotate with the rotation of the drill pipe 13. After reaching the bottom of the hole, the guide bevel 1011 of the wedge 1 maintains the preset azimuth, thereby achieving self-directional drilling. After lowering to the bottom of the hole, weight on bit is applied via the drill pipe 13, causing the wedge 1 to engage the bottom of the hole. Simultaneously, the drive key 4021 is set in the keyway 3011. At this point, the drill rig is activated on the surface to rotate the drill pipe 13. The threads between the first end of the connecting tube 302 and the inner wall of the wedge 1 are disengaged, separating the wedge 1 from the connecting tube 302. The drill pipe 13 is lifted, and the remaining components, excluding the wedge 1, move upward with the drill pipe 13. The wedge 1 remains at the bottom of the hole, allowing directional drilling to be performed using its guide bevel 1011. Since no sleeve is provided and the directional drill rod 13 is lifted up before directional drilling, there is no need to replace the smaller drill rod 13 and drill bit during directional drilling. The drill bit can be directly installed on the directional drill rod 13, and directional drilling can be achieved using the original drill rod 13 and drill bit. In this way, the autonomous directional device 100 does not need to prepare two levels of drill rods 13 and drill bits, which effectively reduces production investment. There is no need to expand the hole, and drilling can be done directly, which is simple to operate.

[0051] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An autonomous orientation device, characterized in that: include: wedge; a counterweight structure, the counterweight structure being disposed on the wedge; a rotating shaft body, the rotating shaft body being coaxially arranged with the wedge body, the first end of the rotating shaft body extending into the interior of the wedge body and being threadedly connected to the inner wall of the wedge body; a connecting sleeve, the connecting sleeve being coaxially arranged with the rotating shaft, the first end of the connecting sleeve being used to connect to the drill rod, and the second end of the rotating shaft extending from the second end of the connecting sleeve into the interior of the connecting sleeve; An intermediate sleeve, which is arranged inside the connecting sleeve body and rotates synchronously with the connecting sleeve body, and is rotatably sleeved on the rotating shaft body; a limiting structure, the limiting structure being provided at the second end of the rotating shaft body and being used for limiting the rotating shaft body from coming out of the intermediate sleeve; One of the connecting sleeve and the rotating shaft body is provided with a transmission key, and the other is provided with a key slot that cooperates with the transmission key. When the transmission key is in a first position, the transmission key and the key slot are separated from each other. When the transmission key is in a second position, the transmission key is arranged in the key slot.

2. The autonomous orientation device according to claim 1, characterized in that: It also includes two bearings. The connecting sleeve body includes a connecting joint and a bearing sleeve. The first end of the connecting joint is used to connect to the drill pipe, and the second end of the connecting joint is connected to the bearing sleeve. The two bearings are respectively arranged at both ends of the intermediate sleeve. Each of the bearings is sleeved on the rotating shaft body. The bearing sleeve is coaxially arranged with the rotating shaft body, and the bearing sleeve is nested outside the intermediate sleeve so that the bearing sleeve and the intermediate sleeve can rotate synchronously.

3. The autonomous orientation device according to claim 2, characterized in that: It also includes an elastic member, the first end of the bearing close to the limiting structure is abutted against the first end of the bearing sleeve, when the transmission key is in the first position, the second end of the bearing close to the limiting structure is abutted against the limiting structure, when the transmission key is in the second position, the second end of the bearing close to the limiting structure is separated from the limiting structure, a first step surface is provided inside the bearing sleeve, and a second step surface is provided on the rotating shaft body, the first end of the bearing away from the limiting structure is abutted against the first step surface, the second end is abutted against the first end of the elastic member, and the second end of the elastic member is abutted against the second step surface.

4. The autonomous orientation device according to claim 2, characterized in that: It also includes an oil cup for lubricating the two bearings, the oil cup is arranged inside the connecting sleeve, and the axis of the oil cup coincides with the axis of the connecting sleeve, and a plurality of oil grooves are evenly arranged on the circumference of the rotating shaft body, each of the oil grooves is arranged along the axial direction of the rotating shaft body, and the first end of each oil groove is flush with the second end of the rotating shaft body, and the second end of each oil groove extends at least to the bearing away from the limiting structure, and each oil groove is connected to the oil cup.

5. The autonomous orientation device according to claim 4, characterized in that: It also includes a mounting structure, which divides the interior of the connecting joint into a first cavity and a second cavity that are independent of each other. The second end of the rotating shaft body extends into the second cavity. The connecting sleeve body is circumferentially provided with multiple openings, each of which is connected to the first cavity. The oil cup is arranged on the mounting structure, and the oil inlet end and the oil outlet end of the oil cup are respectively arranged in the first cavity and the second cavity.

6. The autonomous orientation device according to claim 1, characterized in that: The rotating shaft body includes a connecting shaft and a connecting cylinder, the first end of the connecting cylinder is threadedly connected to the first end of the connecting shaft, the second end of the connecting shaft is provided with the limiting structure, the second end of the connecting cylinder is threadedly connected to the inner wall of the wedge, and the threads at both ends of the connecting cylinder have opposite rotation directions.

7. The autonomous orientation device according to claim 1, characterized in that: A plurality of claws are circumferentially arranged on one end of the wedge away from the rotating shaft.

8. The autonomous orientation device according to claim 1, characterized in that: A plurality of guide grooves are provided inside the wedge body, and each of the guide grooves is provided along the axial direction of the wedge body. A guide block is provided on the counterweight structure, and the guide block is slidably connected to each of the guide grooves.

9. The autonomous orientation device according to claim 3, characterized in that: The elastic member is a spring.

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