Power head structure of large-aperture casing drilling machine

Abstract

The invention discloses a power head structure of a large-aperture casing drilling machine. The power head structure comprises a box body, and an input gear shaft, a middle idle gear and a connecting cylinder are arranged in the box body; one end of the input gear shaft is connected with the planetary reducer, and the input gear shaft is meshed with the middle idle gear to transmit power; the connecting cylinder is connected with the box body through a first tapered roller bearing, a thrust ball bearing and a deep groove ball bearing, and an output gear meshed with the middle idle gear is arranged on the outer side of the connecting cylinder; the top of the connecting cylinder is provided with an upper transparent cover connected through a labyrinth seal, and the bottom of the connecting cylinder is provided with a hydraulic clamping device. The high-speed-ratio power transmission device is simple in structure, stable, reliable and convenient to maintain, power transmission with the high speed ratio of 130 or above can be achieved, and high-torque output is conducted; casing running operation can be synchronously completed in the drilling process, and the jamming risk is greatly reduced; repeated links of pulling out of a hole and running a casing pipe are omitted, the construction period is shortened by 40%-60%, and the working efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of geological drilling equipment technology, and in particular to a power head structure for a large-diameter casing drilling rig. Background Technology

[0002] In fields such as basic engineering, resource exploration, and disaster prevention, large-diameter deep-hole drilling technology is increasingly widely used. Traditional large-diameter casing construction typically employs a step-by-step process of "drilling first, then running the casing." This process has the following significant drawbacks: 1) A pilot hole smaller than the casing diameter must be drilled first, and then the large-diameter casing is run in separately, which can easily lead to casing jamming, deviation, or deformation; 2) The process is complex, requiring multiple steps such as "drilling, tripping, running the casing, cementing, and then running the drill again," resulting in low construction efficiency and a long cycle. Therefore, casing drilling rig technology has emerged, enabling simultaneous drilling and casing running, effectively avoiding casing jamming and significantly improving construction efficiency. However, while current large-diameter casing drilling rigs on the market can achieve simultaneous operation, they still have significant shortcomings in practical applications: First, their torque transmission capacity is limited, making it difficult to meet the high torque requirements of large-diameter casing drilling; second, their complex structure makes maintenance inconvenient, and their overall stability and service life need improvement. The aforementioned technical bottlenecks have hindered the further promotion and application of large-diameter casing drilling rigs in high-efficiency, high-torque operation scenarios. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a power head structure for a large-diameter casing drilling rig, specifically employing the following technical solution: The power head structure of the large-diameter casing drilling rig of the present invention includes a housing, in which an input gear shaft, an intermediate idler gear, and a connecting cylinder are disposed; one end of the input gear shaft is connected to a planetary reducer, and the input gear shaft meshes with the intermediate idler gear to transmit power; the connecting cylinder is connected to the housing through a first tapered roller bearing, a thrust ball bearing, and a deep groove ball bearing, and an output gear meshing with the intermediate idler gear is disposed on the outer side of the connecting cylinder; the top of the connecting cylinder is provided with an upper transparent cover connected by a labyrinth seal, and the bottom of the connecting cylinder is provided with a hydraulic clamping device.

[0004] This invention employs a planetary reducer for power input. The planetary reducer synchronously drives the input gear shaft via a spline connection to transmit power. The input gear then transmits power to the output gear through an intermediate idler gear. The output gear is bolted to the connecting cylinder to output power. Its structure is simple and easy to maintain, enabling high speed ratios of over 130 for power transmission and high torque output.

[0005] Preferably, the connecting cylinder is located at the center of the housing, and two input gear shafts are symmetrically arranged on the front side of the connecting cylinder. An intermediate idler gear is provided between the connecting cylinder and each input gear shaft. This invention, by providing multiple input shafts, avoids single-point overload and improves the overall load-bearing capacity of the mechanism.

[0006] Preferably, the top and bottom of both the input gear shaft and the intermediate idler gear are connected to the housing via second tapered roller bearings. This structure effectively suppresses shaft bending deformation and vibration, ensures precise meshing of the gear transmission components, and extends the lifespan of the mechanism.

[0007] Preferably, the outer side of the connecting cylinder is provided with a first tapered roller bearing, a thrust ball bearing, and a deep groove ball bearing. The first tapered roller bearing is fixed to the upper end of the connecting cylinder by an upper cover. The thrust ball bearing is disposed on the bottom plate inside the housing. The deep groove ball bearing is fixed to the lower part of the connecting cylinder by a lower connecting end cover. The output gear is disposed between the first tapered roller bearing and the thrust ball bearing. The thrust ball bearing and the first tapered roller bearing are used to withstand the axial force generated during drilling, while the deep groove ball bearing is used for centering. The three bearings work together to improve the load-bearing capacity and stability of the overall structure.

[0008] Preferably, a gear oil pump is installed on the top of the housing, and the output end of the gear oil pump is provided with multiple lubricating oil delivery pipes. This invention ensures the lubrication of gear transmission components and improves their service life through forced lubrication by the gear oil pump.

[0009] The power head structure of the large-diameter casing drilling rig provided by this invention is simple, stable, reliable, and easy to maintain. It can transmit power at a high speed ratio of over 130 and output high torque. During the drilling process, the casing can be lowered simultaneously, greatly reducing the risk of jamming. It eliminates the repetitive steps of starting the drill and lowering the casing, shortening the construction period by 40%-60% and greatly improving work efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention.

[0011] Figure 2 yes Figure 1 Top view.

[0012] Figure 3 yes Figure 2 A sectional view along the AA direction. Detailed Implementation

[0013] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific working processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0014] like Figure 1-3 As shown, the power head structure of the large-diameter casing drilling rig of the present invention includes a housing 1, within which an input gear shaft 2, an intermediate idler gear 3, and a connecting cylinder 4 are disposed. In this embodiment, the connecting cylinder 4 is located at the center of the housing 1, and two input gear shafts 2 are symmetrically arranged on the front side of the connecting cylinder 4. An intermediate idler gear 3 is disposed between the connecting cylinder 4 and each input gear shaft 2. The top and bottom of the input gear shaft 2 and the intermediate idler gear 3 are connected to the housing 1 by a second tapered roller bearing 5. Through the above structure, the bending deformation and vibration of the shaft can be effectively suppressed, ensuring the precise meshing of the gear transmission components and extending the service life of the mechanism. A planetary reducer 6 is disposed at the bottom of each input gear shaft 2, and the planetary reducer 6 rotates synchronously with the input gear shaft 2 via a spline connection. The input gear in the middle of each input gear shaft 2 meshes with the corresponding intermediate idler gear 3, and the intermediate idler gear 3 meshes with the output gear 7 on the outer side of the connecting cylinder 4. Through the power input of the planetary reducer 6, the input gear shaft 2 transmits power to the output gear 7 through the intermediate idler gear 3. The output gear 7 is connected to the connecting cylinder 4 by bolts to output power, thereby achieving a high speed ratio of over 130 to transmit power and output high torque.

[0015] The aforementioned connecting cylinder 4 is connected to the housing 1 via a first tapered roller bearing 41, a thrust ball bearing 42, and a deep groove ball bearing 43. The first tapered roller bearing 41 is fixed to the upper end of the connecting cylinder 4 via an upper cover. The thrust ball bearing 42 is mounted on the inner bottom plate of the housing 1. The deep groove ball bearing 43 is fixed to the lower part of the connecting cylinder 4 via a lower connecting end cover. The output gear 7 is located between the first tapered roller bearing 41 and the thrust ball bearing 42. The first tapered roller bearing 41 and the thrust ball bearing 42 are used to withstand the axial force generated during drilling, while the deep groove ball bearing 43 provides centering. The combined effect of these three components improves the overall load-bearing capacity and stability of the structure.

[0016] A gear oil pump 9 is installed at the top of the connecting cylinder 4. The output end of the gear oil pump 9 is equipped with multiple lubricating oil delivery pipes 10, which are used to deliver lubricating oil to each bearing to ensure the lubrication of the gear transmission components and improve their service life. The upper cover of the connecting cylinder 4 is equipped with a labyrinth seal 11, and the bottom of the connecting cylinder 4 is equipped with a hydraulic clamping device.

[0017] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 this invention.

Claims

1. A power head structure for a large-diameter casing drilling rig, characterized in that: The device includes a housing, inside which are an input gear shaft, an intermediate idler gear, and a connecting cylinder. One end of the input gear shaft is connected to a planetary reducer, and the input gear shaft meshes with the intermediate idler gear to transmit power. The connecting cylinder is connected to the housing via a first tapered roller bearing, a thrust ball bearing, and a deep groove ball bearing. An output gear that meshes with the intermediate idler gear is located on the outer side of the connecting cylinder. The top of the connecting cylinder is provided with an upper transparent cover connected by a labyrinth seal, and the bottom of the connecting cylinder is provided with a hydraulic clamping device.

2. The power head structure of the large-diameter casing drilling rig according to claim 1, characterized in that: The connecting cylinder is located at the center of the housing, and two input gear shafts are symmetrically arranged on the front side of the connecting cylinder. An intermediate idler gear is provided between the connecting cylinder and each input gear shaft.

3. The power head structure of the large-diameter casing drilling rig according to claim 1, characterized in that: The top and bottom of the input gear shaft and the intermediate idler gear are both connected to the housing via second tapered roller bearings.

4. The power head structure of the large-diameter casing drilling rig according to claim 1, characterized in that: The outer side of the connecting cylinder is provided with a first tapered roller bearing, a thrust ball bearing, and a deep groove ball bearing. The first tapered roller bearing is fixed to the upper end of the connecting cylinder through an upper cover. The thrust ball bearing is set on the bottom plate inside the housing. The deep groove ball bearing is fixed to the lower part of the connecting cylinder through a lower connecting end cover. The output gear is set between the first tapered roller bearing and the thrust ball bearing.

5. The power head structure of the large-diameter casing drilling rig according to claim 1, characterized in that: A gear oil pump is installed on the top of the housing, and multiple lubricating oil delivery pipes are installed at the output end of the gear oil pump.

Images