High-speed rotary head with self-lubricating

Abstract

The utility model discloses a take self -lubricating high -speed rotation head of big torque, including support mechanism, its inner chamber is equipped with the reduction mechanism of realizing big torque output, is equipped with the hydraulic motor for realizing power source input on support mechanism, still be equipped with liquid inlet hole A, liquid inlet hole B, liquid inlet hole C and liquid outlet hole on support mechanism. The utility model discloses over liquid inlet hole A, liquid inlet hole B, liquid inlet hole C, liquid outlet hole and external lubrication circulating system cooperation, by lubricating pump even delivery lubricating oil to each gear and bearing position, effectively promote lubrication efficiency, realize circulation lubrication and cooling, input assembly and transmission assembly realize one -stage reduction, transmission assembly and output assembly realize two -stage reduction, adopt two -stage reduction mechanism cooperation double -hydraulic motor drive, realize the collaborative output of big torque high -speed, optimized transmission performance, torque adaptive system can automatically adjust output torque according to rock hardness, effectively prolongs the drill bit life under the hard rock condition such as granite, reduces energy consumption.

Description

Technical Field

[0001] This utility model belongs to the technical field of drilling rig power rotary heads, specifically relating to a high-speed, high-torque rotary head with self-lubrication. Background Technology

[0002] Roller cone drilling rigs are widely used in drilling operations in fields such as mining, petroleum, and geological exploration. Their rotary head, as the core power component, is responsible for driving the drill rod to rotate and transmitting torque.

[0003] The traditional rotary head of a rotary drill currently has the following problems:

[0004] Lubrication failure problem: Traditional greases are prone to carbonization and failure at high speeds, requiring frequent shutdowns for maintenance and resulting in low operating efficiency.

[0005] Torque output limitations: Conventional single-stage gear transmission mechanisms are prone to tooth surface wear when drilling in high-pressure rock formations, making it difficult to balance the demands of high speed and high torque.

[0006] Insufficient heat dissipation: Under high-speed and high-torque conditions, the heat generated by gear meshing and bearing operation accumulates and is difficult to dissipate in time, resulting in high component temperature, accelerated component aging, and short equipment lifespan.

[0007] In existing technologies, some solutions supplement lubrication through external grease pumps, but these solutions suffer from drawbacks such as a narrow transmission ratio adjustment range, low peak output torque, excessively large radial dimensions at large transmission ratios, low transmission efficiency, and short service life. Utility Model Content

[0008] The purpose of this invention is to provide a high-speed, high-torque rotary head with self-lubrication, in order to solve the technical problems of low equipment efficiency and short service life caused by easy lubrication failure, limited torque, and poor heat dissipation performance of existing rotary heads for rotary roller drilling rigs.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A high-speed, high-torque rotary head with self-lubrication includes a support mechanism, the inner cavity of which is equipped with a reduction mechanism to achieve high torque output. The support mechanism is equipped with a hydraulic motor for power source input, and the support mechanism is also equipped with inlet hole A, inlet hole B, inlet hole C and outlet hole.

[0011] The support mechanism includes a housing and a cover. The cover is installed on the top of the housing, and the housing and the cover cooperate to form the mounting cavity for the deceleration mechanism.

[0012] The deceleration mechanism includes two input components located at opposite corners of the mounting cavity, an output component located at the center of the mounting cavity, two hydraulic motors located on the top of the cover, and the hydraulic motors are arranged in a one-to-one correspondence with the input components. A transmission component is provided between the input components and the output components. The input components, output components, and transmission components are all movably connected within the mounting cavity.

[0013] As a further embodiment of this utility model, the input component includes an input shaft coaxially arranged with the hydraulic motor. Deep groove ball bearings A are installed at the top and bottom of the surface of the input shaft. The two ends of the input shaft are rotatably connected to the housing and the cover respectively through the corresponding deep groove ball bearings A. A gear A that is connected to the transmission component is fixedly connected to the surface of the input shaft. The input shaft is connected to the corresponding external spline shaft of the hydraulic motor through an internal spline.

[0014] As a further embodiment of this utility model, the output component includes an output shaft arranged parallel to the input shaft. Tapered roller bearings are installed on the top and bottom of the output shaft surface, and a cylindrical roller bearing is also installed on the bottom of the output shaft surface. The cylindrical roller bearing is located below the tapered roller bearing. The top end of the output shaft is rotatably connected to the housing cover through the tapered roller bearing, and the bottom end of the output shaft is rotatably connected to the housing through the tapered roller bearing and the cylindrical roller bearing. A gear B that is connected to the transmission component is fixedly connected to the surface of the output shaft.

[0015] As a further embodiment of this utility model, the transmission assembly includes a transmission shaft arranged parallel to the output shaft, a deep groove ball bearing B installed on the top of the transmission shaft surface, a self-aligning roller bearing installed on the bottom of the transmission shaft surface, and gears C and D fixedly connected from top to bottom on the transmission shaft surface, with gear C meshing with gear B and gear D meshing with gear A.

[0016] As a further embodiment of this utility model, gear A is located between two deep groove ball bearings A, gear B is located between two tapered roller bearings, and gears C and D are both located between deep groove ball bearing B and self-aligning roller bearings.

[0017] As a further embodiment of this utility model, the outer diameters of gears A, D, C and B increase sequentially, and the two hydraulic motors ensure consistent output speed and torque through a synchronizing valve or a mechanical synchronizing mechanism.

[0018] As a further embodiment of this utility model, inlet holes A, B, and C are respectively opened on the cover, and outlet hole is opened at the bottom of the box. Inlet holes A, B, C and outlet hole are all connected to the mounting cavity. Inlet holes A, B and C are respectively connected to the output end of the lubrication pump in the external lubrication circulation system through conduits. Outlet hole is connected to the input end of the lubrication pump in the external lubrication circulation system through conduits.

[0019] As a further embodiment of this utility model, the liquid inlet hole A is configured in a one-to-one correspondence with the input component, the liquid inlet hole B with the output component, and the liquid inlet hole C with the transmission component. The liquid inlet hole A, the liquid inlet hole B, and the liquid inlet hole C are respectively connected to the bearing seat oil passages of the input component, the output component, and the transmission component through channels. The oil passage outlet is directly opposite the bearing raceway and the gear meshing line. The bottom of the mounting cavity is provided with a drainage channel that communicates with the liquid outlet hole.

[0020] As a further embodiment of this invention, a torque adaptive system is also included. The torque adaptive system includes a controller, a rotary pressure sensor, and an electro-proportional solenoid valve. The rotary pressure sensor is installed in the oil inlet line of the hydraulic motor to collect the hydraulic system pressure in real time. The controller is electrically connected to the rotary pressure sensor and the electro-proportional solenoid valve. The controller has a preset pressure-displacement mapping curve. When the detected pressure exceeds a threshold P, the controller outputs a control signal to reduce the opening of the electro-proportional solenoid valve, thereby reducing the hydraulic motor displacement to increase torque. When the pressure is lower than the threshold P, the displacement is increased to increase the speed, thus achieving adaptive matching of torque and speed.

[0021] Compared with existing technologies, the self-lubricating high-speed, high-torque rotary head of this invention has the following advantages:

[0022] This invention utilizes an external lubrication circulation system in conjunction with inlet holes A, B, and C, and an outlet hole. A lubrication pump evenly delivers lubricating oil to each gear and bearing, effectively improving lubrication efficiency and achieving circulating lubrication and cooling. The input and transmission components achieve a single-stage reduction, while the transmission and output components achieve a two-stage reduction. This two-stage reduction mechanism, coupled with dual hydraulic motors, achieves coordinated output of maximum torque and speed under maximum rotational pressure, optimizing transmission performance. The torque adaptive system automatically adjusts the output torque according to the rock hardness, effectively extending drill bit life in hard rock conditions such as granite, reducing energy consumption, and offering strong adaptability to various working conditions. The output component employs a dual-stage drive shaft design, reducing the radial dimension compared to traditional rotary heads with the same parameters, resulting in a more compact structure suitable for narrow-body drilling rigs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0025] Figure 2This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 3 ;

[0027] Figure 4 This is a partial structural diagram of an embodiment of the present utility model. Figure 1 ;

[0028] Figure 5 This is a partial structural diagram of an embodiment of the present utility model. Figure 2 ;

[0029] Figure 6 This is a schematic diagram of the deceleration mechanism in an embodiment of the present invention. Figure 1 ;

[0030] Figure 7 This is a schematic diagram of the deceleration mechanism in an embodiment of the present invention. Figure 2 .

[0031] Figure label:

[0032] 100. Supporting mechanism; 110. Box body; 120. Box cover;

[0033] 200. Reduction mechanism; 210. Input assembly; 211. Input shaft; 212. Deep groove ball bearing A; 213. Gear A; 220. Output assembly; 221. Output shaft; 222. Tapered roller bearing; 223. Cylindrical roller bearing; 224. Gear B; 230. Transmission assembly; 231. Transmission shaft; 232. Deep groove ball bearing B; 233. Self-aligning roller bearing; 234. Gear C; 235. Gear D;

[0034] 300, Hydraulic motor; 400, Inlet A; 500, Inlet B; 600, Inlet C; 700, Outlet. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0036] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0037] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0038] See appendix Figures 1-7 As shown, the present invention provides a self-lubricating high-speed, high-torque rotary head, including a support mechanism 100, the inner cavity of which is provided with a reduction mechanism 200 to achieve high torque output. The support mechanism 100 is provided with a hydraulic motor 300 for power source input. The support mechanism 100 is also provided with a liquid inlet A400, a liquid inlet B500, a liquid inlet C600 and a liquid outlet 700.

[0039] The support mechanism 100 includes a housing 110 and a cover 120. The cover 120 is installed on the top of the housing 110 by screws. The housing 110 and the cover 120 cooperate to form the mounting cavity of the deceleration mechanism 200. The mating surface of the housing 110 and the cover 120 is provided with an annular sealing groove, and an O-ring is installed in the inner cavity of the annular sealing groove.

[0040] The deceleration mechanism 200 includes two input components 210 located at opposite corners of the mounting cavity, an output component 220 located at the center of the mounting cavity, two hydraulic motors 300 located on the top of the cover 120, and the hydraulic motors 300 and the input components 210 are arranged in a one-to-one correspondence. A transmission component 230 is provided between the input components 210 and the output components 220. The input components 210, the output components 220 and the transmission component 230 are all movably connected to the mounting cavity.

[0041] The two diagonal input components 210 and the central output component 220 are arranged in conjunction with the transmission components to form a two-stage reduction path of hydraulic motor 300-input shaft 211-transmission shaft 231-output shaft 221. Under the maximum rotational pressure, it achieves a synergistic output of a large torque of 11800 N·m and a high speed of 160 r / min, breaking through the torque limitation of traditional single-stage reduction.

[0042] Each inlet and outlet port 700 is configured to provide channels for lubricating oil circulation. In conjunction with an external lubrication circulation system, it solves the problem of traditional grease lubrication failing due to carbonization at high speed and high temperature, enabling continuous operation without stopping for oil replenishment and improving efficiency.

[0043] When the above-mentioned technology is used, a synergistic mechanism of hydraulic power input, two-stage gear reduction, precise lubrication and cooling, and adaptive torque adjustment is employed to achieve a composite output of high speed and high torque. Its core workflow is as follows:

[0044] The hydraulic motor 300 is coaxially connected to the input shaft 211 through the spline interface on the top of the housing 120. Hydraulic oil enters the hydraulic motor 300 through the oil inlet pipe, pushing the plunger assembly to rotate and converting hydraulic energy into mechanical energy.

[0045] Synchronization valves or mechanical synchronization mechanisms (such as gear timing belts) ensure that the output speed difference between the two hydraulic motors 300 is ≤ ±1.5%, avoiding uneven load on the reduction assembly 200 due to asynchronous power.

[0046] First-stage reduction: Input shaft 211 drives gear A213 to rotate, and gear A213 meshes with gear D235 on transmission shaft 231 (outer diameter of gear A213 < outer diameter of gear D235), thus achieving the first reduction.

[0047] Secondary reduction: The transmission shaft 231 meshes with the gear B224 on the output shaft 221 through the gear C234 (the outer diameter of gear C234 is less than the outer diameter of gear B224), thus achieving a second reduction and ultimately amplifying the output shaft torque (e.g., when the input torque is 6900 N·m, the output torque reaches 11800 N·m).

[0048] The deep groove ball bearings A212 at both ends of the input shaft 211 bear only radial loads, ensuring radial stability during high-speed rotation; the tapered roller bearing 222 at the bottom of the output shaft 221 cooperates with the cylindrical roller bearing 223 to bear both radial force (cylindrical roller bearing 223) and axial force (tapered roller bearing 222, from drilling thrust), avoiding shaft deformation.

[0049] The lubrication pump injects lubricating oil through inlet A400 (corresponding to input component 210), inlet B500 (corresponding to output component 220), and inlet C600 (corresponding to transmission component 230). The oil is then directly sprayed through the bearing housing oil passage to friction pairs such as deep groove ball bearing A212 and tapered roller bearing 222, as well as gear meshing lines. The lubricating oil, carrying heat and metal debris, flows along the drainage channel at the bottom of the mounting cavity into outlet 700. After being filtered by the oil filter, it flows back to the lubrication pump, forming a closed-loop circulation.

[0050] In this embodiment of the invention, the input component 210 includes an input shaft 211 coaxially arranged with the hydraulic motor 300. Deep groove ball bearings A212 are mounted on the top and bottom of the input shaft 211. The two ends of the input shaft 211 are rotatably connected to the housing 110 and the cover 120 respectively via corresponding deep groove ball bearings A212. A gear A213, which is connected to the transmission component 230, is fixedly connected to the surface of the input shaft 211. The input shaft 211 is connected to the corresponding external spline shaft of the hydraulic motor 300 via an internal spline. The coaxial arrangement and spline connection ensure that the power of the hydraulic motor 300 is transmitted without eccentricity. The deep groove ball bearings A212 bear radial loads, ensuring radial stability of the input shaft 211 during high-speed rotation and reducing vibration. The gear A213 is located between the two deep groove ball bearings A212, ensuring that the transmission load is evenly distributed on the bearings, avoiding deformation caused by cantilevered force on the shaft end, and extending the bearing life.

[0051] The output assembly 220 includes an output shaft 221 arranged parallel to the input shaft 211. Tapered roller bearings 222 are mounted on the top and bottom surfaces of the output shaft 221, and a cylindrical roller bearing 223 is also mounted on the bottom surface of the output shaft 221, located below the tapered roller bearings 222. The top end of the output shaft 221 is rotatably connected to the housing cover 120 via the tapered roller bearings 222, and the bottom end of the output shaft 221 is rotatably connected to the housing 110 via the tapered roller bearings 222 and the cylindrical roller bearings 223. The output shaft 221 is fixedly connected to a gear B224 that is connected to the transmission assembly 230. The tapered roller bearing 222 bears both radial and axial loads (axial thrust during drilling), and the cylindrical roller bearing 223 enhances radial support. The two work together to enable the output shaft 221 to withstand a torque of 11800 N·m, avoiding fatigue damage of traditional single bearings. The double tapered roller bearing 222 constrains the axial movement of the output shaft 221, ensuring the meshing accuracy of the gear B224 and the transmission assembly 230, and reducing impact noise during high-speed operation.

[0052] The transmission assembly 230 includes a transmission shaft 231 arranged parallel to the output shaft 221. A deep groove ball bearing B232 is installed on the top of the surface of the transmission shaft 231, and a self-aligning roller bearing 233 is installed on the bottom of the surface of the transmission shaft 231. Gears C234 and D235 are fixedly connected from top to bottom on the surface of the transmission shaft 231. Gear C234 meshes with gear B224, and gear D235 meshes with gear A213. The outer diameters of gears D235 and C234 are designed to increase sequentially, forming a reduction chain of input shaft 211-transmission shaft 231-output shaft 221. The transmission ratio is amplified by the difference in gear diameters, and a large torque is finally output. The self-aligning roller bearing 233 at the bottom of the transmission shaft 231 can automatically compensate for shaft deflection or installation errors, adapt to shaft deformation at high speeds (160 r / min), and avoid tooth surface wear caused by gear meshing misalignment.

[0053] Gear A213 is located between two deep groove ball bearings A212, gear B224 is located between two tapered roller bearings 222, and gears C234 and D235 are both located between deep groove ball bearing B232 and self-aligning roller bearing 233. The central mounting of the gears ensures a symmetrical distribution of radial forces on the bearings, preventing overload on one side of the bearing. For example, gear A211, located between two deep groove ball bearings A212, can evenly transfer the transmission load to the two deep groove ball bearings A212 at both ends, extending the bearing life. The gears are located within the bearing support area, reducing the impact of shaft deformation on the meshing line, ensuring stable gear backlash during high-speed operation, and reducing transmission noise.

[0054] The outer diameters of gears A213, D235, C234, and B224 increase sequentially. The two hydraulic motors 300 ensure consistent output speed and torque through a synchronization valve or mechanical synchronization mechanism (such as an electro-hydraulic synchronization valve or a gear synchronization belt). The gear sequence with increasing outer diameters forms a two-stage reduction ratio, which amplifies the output torque to meet the requirements of hard rock drilling. The synchronous control of the two hydraulic motors 300 avoids uneven force on the reduction assembly 200 (overload of input shaft 211) caused by speed difference, thus improving gear life.

[0055] Liquid inlet holes A400, B500, and C600 are respectively opened on the cover 120, and liquid outlet hole 700 is opened at the bottom of the housing 110. Liquid inlet holes A400, B500, C600, and 700 are all connected to the mounting cavity. Liquid inlet holes A400, B500, and C600 are respectively connected to the output end of the lubrication pump in the external lubrication circulation system through conduits. Liquid outlet hole 700 is connected to the input end of the lubrication pump in the external lubrication circulation system through a conduit. The external lubrication circulation system includes an oil filter. The lubrication pump delivers lubricating oil to the mounting cavity through liquid inlet holes A400, B500, and C600 to directly flush the gear meshing surface and bearing raceway, remove operating heat, and reduce the temperature of the components. Liquid outlet hole 700 returns to the input end of the lubrication pump, working with the oil filter to filter metal debris and prevent bearing scratches caused by impurities.

[0056] The inlet port A400 is configured in a one-to-one correspondence with the input component 210, the inlet port B500 with the output component 220, and the inlet port C600 with the transmission component 230. The inlet ports A400, B500, and C600 are respectively connected to the bearing housing oil passages of the input component 210, the output component 220, and the transmission component 230 through channels. The oil passage outlet is directly aligned with the bearing raceway and the gear meshing line. A drainage channel is provided at the bottom of the mounting cavity, which is connected to the outlet port. The oil passage outlet is aligned with the bearing raceway (such as the raceway of the deep groove ball bearing A212) and the gear meshing line, so that the lubricating oil acts directly on the friction pair, improving the lubrication efficiency and avoiding the blind spot of traditional splash lubrication. The drainage channel guides the lubricating oil to flow quickly to the outlet port 700, preventing the seals from aging due to oil accumulation at the bottom of the housing 110, and also preventing oxidation and deterioration caused by oil stagnation.

[0057] This embodiment of the utility model also includes a torque adaptive system for the self-lubricating high-speed, high-torque rotary head. The torque adaptive system includes a controller, a rotary pressure sensor, and an electro-proportional solenoid valve. The rotary pressure sensor is installed in the oil inlet line of the hydraulic motor 300 to collect the hydraulic system pressure in real time. The controller is electrically connected to the rotary pressure sensor and the electro-proportional solenoid valve. The controller has a preset pressure-displacement mapping curve. When the detected pressure exceeds the threshold P1, the controller outputs a control signal to reduce the opening of the electro-proportional solenoid valve, thereby reducing the displacement of the hydraulic motor 300 to increase the torque. When the pressure is lower than the threshold P2, the displacement is increased to increase the speed, thus achieving adaptive matching of torque and speed.

[0058] In summary, this embodiment of the invention, through the cooperation of inlet holes A400, B500, C600, and outlet hole 700 with an external lubrication circulation system, uses a lubrication pump to evenly deliver lubricating oil to each gear and bearing, effectively improving lubrication efficiency and achieving circulating lubrication and cooling. The input component 210 and transmission component 230 achieve a first-stage reduction, while the transmission component 230 and output component 220 achieve a second-stage reduction. This second-stage reduction mechanism, coupled with dual hydraulic motors, achieves a combined output of 11800 N·m of high torque and 160 r / min of high speed under maximum rotational pressure, optimizing transmission performance. The torque adaptive system automatically adjusts the output torque according to the rock hardness, effectively extending drill bit life in hard rock conditions such as granite, reducing energy consumption, and offering strong adaptability to various working conditions. The output component 220 adopts a dual-stage drive shaft design, reducing the radial dimension compared to traditional rotary heads with the same parameters, resulting in a more compact structure suitable for narrow-body drilling rig installation requirements.

[0059] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-speed rotary head with self-lubricating high-torque, comprising a supporting mechanism (100), characterized in that: Its inner cavity is provided with a reduction mechanism (200) to achieve high torque output, and the support mechanism (100) is provided with a hydraulic motor (300) for power source input. The support mechanism (100) is also provided with a liquid inlet A (400), a liquid inlet B (500), a liquid inlet C (600) and a liquid outlet (700). The support mechanism (100) includes a housing (110) and a cover (120). The cover (120) is installed on the top of the housing (110). The housing (110) and the cover (120) cooperate to form the mounting cavity of the deceleration mechanism (200). The deceleration mechanism (200) includes two input components (210) located at opposite corners of the mounting cavity. An output component (220) is located at the center of the mounting cavity. Two hydraulic motors (300) are located on the top of the cover (120), and the hydraulic motors (300) are arranged in a one-to-one correspondence with the input components (210). A transmission component (230) is provided between the input components (210) and the output components (220). The input components (210), the output components (220), and the transmission component (230) are all movably connected within the mounting cavity.

2. The high-rotational-speed high-torque swivelling head with self-lubrication according to claim 1, characterized in that: The input component (210) includes an input shaft (211) coaxially arranged with the hydraulic motor (300). Deep groove ball bearings A (212) are installed on the top and bottom of the surface of the input shaft (211). The two ends of the input shaft (211) are rotatably connected to the housing (110) and the cover (120) respectively through the corresponding deep groove ball bearings A (212). A gear A (213) that is connected to the transmission component (230) is fixedly connected to the surface of the input shaft (211). The input shaft (211) is connected to the external spline shaft of the corresponding hydraulic motor (300) through an internal spline.

3. The self-lubricating high-rotational-speed large-torque swivelling head according to claim 2, characterized in that: The output assembly (220) includes an output shaft (221) arranged parallel to the input shaft (211). Tapered roller bearings (222) are installed on the top and bottom surfaces of the output shaft (221). A cylindrical roller bearing (223) is also installed on the bottom surface of the output shaft (221). The cylindrical roller bearing (223) is located below the tapered roller bearing (222). The top end of the output shaft (221) is rotatably connected to the cover (120) through the tapered roller bearing (222). The bottom end of the output shaft (221) is rotatably connected to the housing (110) through the tapered roller bearing (222) and the cylindrical roller bearing (223). A gear B (224) that is connected to the transmission assembly (230) is fixedly connected to the surface of the output shaft (221).

4. The self-lubricating high-rotational-speed large-torque swivelling head according to claim 3, characterized in that: The transmission assembly (230) includes a transmission shaft (231) arranged parallel to the output shaft (221). A deep groove ball bearing B (232) is installed on the top of the surface of the transmission shaft (231), and a self-aligning roller bearing (233) is installed on the bottom of the surface of the transmission shaft (231). Gear C (234) and gear D (235) are fixedly connected from top to bottom on the surface of the transmission shaft (231). Gear C (234) meshes with gear B (224), and gear D (235) meshes with gear A (213).

5. The self-lubricating high-rotational-speed large-torque swivelling head according to claim 4, characterized in that: Gear A (213) is located between two deep groove ball bearings A (212), gear B (224) is located between two tapered roller bearings (222), and gear C (234) and gear D (235) are both located between deep groove ball bearing B (232) and self-aligning roller bearing (233).

6. The self-lubricating high-rotational-speed large-torque swivelling head according to claim 5, characterized in that: The outer diameters of gears A (213), D (235), C (234) and B (224) increase sequentially, and the two hydraulic motors (300) ensure consistent output speed and torque through a synchronizing valve or a mechanical synchronizing mechanism.

7. The high-rotational-speed high-torque swivelling head with self-lubrication according to claim 6, characterized in that: The inlet holes A (400), B (500), and C (600) are respectively opened on the cover (120), and the outlet hole (700) is opened at the bottom of the box body (110). The inlet holes A (400), B (500), C (600), and 700 are all connected to the mounting cavity. The inlet holes A (400), B (500), and C (600) are respectively connected to the output end of the lubrication pump in the external lubrication circulation system through conduits. The outlet hole (700) is connected to the input end of the lubrication pump in the external lubrication circulation system through a conduit.

8. The high-speed, high-torque rotary head with self-lubrication according to claim 7, characterized in that: The inlet hole A (400) is configured in a one-to-one correspondence with the input component (210), the inlet hole B (500) is configured in a one-to-one correspondence with the output component (220), and the inlet hole C (600) is configured in a one-to-one correspondence with the transmission component (230). The inlet holes A (400), B (500) and C (600) are respectively connected to the bearing seat oil passages of the input component (210), the output component (220) and the transmission component (230) through channels. The outlet of the oil passage is directly opposite the bearing raceway and the gear meshing line. The bottom of the mounting cavity is provided with a drainage channel that communicates with the outlet hole.

9. The high-speed, high-torque rotary head with self-lubrication according to claim 8, characterized in that: It also includes a torque adaptive system, which includes a controller, a rotary pressure sensor, and an electro-proportional solenoid valve. The rotary pressure sensor is installed in the oil inlet line of the hydraulic motor (300) to collect the hydraulic system pressure in real time. The controller is electrically connected to the rotary pressure sensor and the electro-proportional solenoid valve. The controller has a preset pressure-displacement mapping curve. When the pressure exceeds the threshold P1, it outputs a control signal to reduce the opening of the electro-proportional solenoid valve and reduce the displacement of the hydraulic motor (300) to increase the torque. When the pressure is lower than the threshold P2, it increases the displacement to increase the speed, thereby achieving adaptive matching of torque and speed.

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