A quick dismounting type fast shaft pinion gear mounting device for a drilling rig rotary table
By employing a keyless tapered structure and hydrostatic disassembly technology, the problems of stress concentration, disassembly difficulty, and positioning accuracy in the pinion connection of the rotary table's fast shaft were solved, achieving high-strength, precise connection and safe, rapid disassembly, thus improving the safety and efficiency of oil drilling operations.
Patent Information
- Application Number
- CN202522843312.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-12-31
AI Technical Summary
In the existing technology, the connection between the turntable's rapid shaft and the pinion has problems such as stress concentration, difficulty in disassembly, and limited positioning accuracy, which poses safety hazards, especially in the field.
The fast shaft pinion mounting device, which uses a keyless tapered structure, is fixedly connected through a heat fitting process and achieves non-destructive disassembly by using the static pressure generated by the screwing in of the bolts and the extrusion medium, thus eliminating the need for the traditional keyway structure.
It improves the fatigue strength and torque transmission stability of the quick-release shaft head, ensures accurate positioning, and enables rapid and safe disassembly at the well site without the need for high-pressure oil pumps or open flame heating, thereby improving maintenance efficiency and safety.
Smart Images
Figure CN224944235U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil drilling and production machinery and equipment technology, specifically to an easy-to-disassemble quick-release shaft pinion mounting device for a drilling rig rotary table. Background Technology
[0002] In oil drilling operations, the rotary table is one of the core power equipment. The rotary table's rapid shaft transmits torque through the meshing of a pinion and a large gear ring; the reliability of this connection directly affects the safety and efficiency of drilling operations. Currently, the connection between the rotary table's rapid shaft and the pinion generally uses a straight-shaft key connection or a conventional straight-shaft interference fit. In practical applications, the following technical defects mainly exist: 1) Stress concentration and shaft head fatigue: As the rotary table often faces high-frequency vibration and frequent forward and reverse switching during drilling, the traditional keyway structure is prone to stress concentration. After long-term operation, fatigue cracks or even fracture accidents often occur at the shaft head.
[0003] 2) Disassembly is extremely difficult: To ensure high torque transmission, the quick-release shaft and pinion typically have a large interference fit. In the field environment of a well site, if the pinion needs to be replaced, due to the lack of large hydraulic pullers or dedicated high-pressure oil pumps, workers are often forced to use open flames to heat it. This not only easily damages the material properties and dimensional accuracy of the journal and gear, but also poses a significant safety hazard in drilling sites containing oil and gas risks.
[0004] 3) Limited positioning accuracy: In the traditional structure with shoulder positioning, if there is slight uneven heating during the heat fitting process, it will often lead to poor contact of the conical surface or uneven axial force, thus affecting the meshing accuracy and service life of the gear. Utility Model Content
[0005] The purpose of this utility model is to provide an easy-to-disassemble quick-release pinion mounting device for drilling rig turntables, so as to solve one or more problems mentioned in the background art.
[0006] To achieve the above objectives, a detachable quick shaft pinion mounting device for a drilling rig rotary table includes a quick shaft and a pinion mounted on its shaft head. The pinion is sleeved on the outer circumferential surface of the quick shaft head, and the two are fixedly connected by a keyless tapered structure.
[0007] This utility model has a simple structure and is easy to operate. The quick shaft head and the pinion are keyless tapered and fixed by heat fitting process. This structure is easy to operate, accurate in positioning and reasonable in force distribution.
[0008] As a preferred and feasible method, the shaft head of the rapid shaft is provided with an axial threaded hole A at its center, a radial oil passage B is provided inside the shaft head of the rapid shaft, and an annular oil distribution groove C is provided on the outer circumferential surface of the shaft head of the rapid shaft. One end of the radial oil passage B communicates with the radial threaded hole A, and the other end extends to the outer circumferential surface of the shaft head as an oil passage outlet and communicates with the annular oil distribution groove C on the outer circumferential surface of the shaft head of the rapid shaft.
[0009] As a preferred and feasible approach, the annular oil distribution groove C is located at the middle of the outer conical surface of the fast shaft head in the axial direction.
[0010] As a preferred and feasible approach, the quick-release shaft and the pinion are connected by an interference fit.
[0011] As a feasible preferred method, the conical mating sections on both sides of the annular oil distribution groove C form a self-sealing structure for the pressure transmission medium under the interference fit between the fast shaft and the pinion.
[0012] As a preferred and feasible approach, the axial threaded hole A is filled with an incompressible pressure-conducting medium.
[0013] As a preferred and feasible approach, the pressure transmission medium includes soap or high-viscosity grease.
[0014] As a preferred feasible method, the axial threaded hole A is used to screw a bolt of the same size into the hole, and the bolt is used to press the extruded medium. The medium is then extruded into the annular oil channel C through the radial oil channel B. Under the continuous screwing action of the bolt, the medium generates static pressure that can cause the fast shaft tapered surface to expand.
[0015] Compared with the prior art, the beneficial effects of this utility model are: 1) High structural strength: The keyless tapered connection is used to replace the keyway in the traditional structure, which causes stress concentration, significantly improving the fatigue strength and torque transmission stability of the fast shaft head; 2) Precise positioning: The shoulder setting in the traditional structure is eliminated. The axial position is determined by measuring the installation depth or the relative position of the end face, which ensures that the pinion and the shaft head are in close contact across the entire surface. 3) Non-destructive disassembly in the field: By utilizing the principle of generating static pressure by screwing in the bolts and compressing the medium, it is possible to complete rapid and non-destructive disassembly on the well site using only manual tools without the need for high-pressure oil pumps or open flame heating, which greatly improves maintenance efficiency and operational safety. Attached Figure Description
[0016] Figure 1 This utility model provides a structural schematic diagram of an easily detachable quick-release shaft pinion mounting device for a drilling rig rotary table. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] It should be noted that all uses of "first", "second", "third" and "fourth" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first", "second", "third" and "fourth" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.
[0019] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 limiting the scope of protection of this utility model.
[0020] like Figure 1 As shown, a detachable quick shaft pinion mounting device for a drilling rig rotary table includes a quick shaft 2 and a pinion 1 mounted on its shaft head. The outer circumferential surface of the shaft head of the quick shaft 2 and the inner bore surface of the pinion 1 are keyless tapered fit and fixedly connected by an interference fit.
[0021] like Figure 1 As shown, the quick-release shaft 2 has an axial threaded hole A at its center and a radial oil passage B inside. An annular oil distribution groove C is located on the outer circumference of the shaft head, corresponding to the outlet of the radial oil passage B. The annular oil distribution groove C is located at the center of the outer conical surface of the shaft head in the axial direction, and the conical mating sections on both sides of the annular oil distribution groove C form a self-sealing structure for the pressure transmission medium. One end of the radial oil passage B communicates with the radial threaded hole A, and the other end extends to the outer circumference of the shaft head, communicating with the annular oil distribution groove C on the outer circumference of the shaft head.
[0022] Installation and Usage Instructions: When it is necessary to assemble the pinion onto the head of the rapid shaft, heat the pinion 1 to the predetermined temperature using induction heating or oil heating, causing the inner hole of the pinion 1 to expand due to heat. Quickly fit the heated pinion onto the head of the rapid shaft 2. Determine the axial position by measuring the installation depth or the relative position of the end faces. After the pinion 1 cools down naturally, the inner hole shrinks, forming a strong interference fit with the rapid shaft 2, and the assembly is complete. When disassembling pinion 1, the following "self-pressurizing" disassembly steps are adopted: Clean the axial threaded hole A of the quick-release shaft 2, fill the threaded hole A with an incompressible pressure-conducting medium, preferably soap or high-viscosity grease, and screw in a standard bolt that matches the size of the axial threaded hole A. As the bolt is continuously screwed in, its end acts like a piston, squeezing the medium inside the hole. The squeezed medium enters the annular oil distribution groove C through the radial oil passage B. Because the annular oil distribution groove C has long tapered mating sections on both sides, a self-sealing structure is formed under the squeezing action of the interference fit, preventing the medium from leaking out rapidly. Continue to rotate the bolt to increase the pressure. When the radial static pressure generated by the medium between the tapered surfaces is sufficient to expand the interference fit and generate sufficient axial unloading force, pinion 1 will instantly and undamagedly disengage from the quick-release shaft 2.
[0023] This invention enables non-destructive and rapid disassembly at the drilling site without the need for an external high-pressure power source. It features a simple structure, reliable installation, convenient maintenance, and high safety. This invention eliminates the traditional keyway through a tapered fit, reducing stress concentration and improving the shaft's fatigue strength. During disassembly, an incompressible medium is filled into the axial threaded hole A on the shaft shaft, and a bolt is screwed into the threaded hole A on the shaft head. This pressurizes the incompressible medium, causing it to enter the conical surface between the pinion and the shaft head through the radial oil passage B and the annular oil distribution groove C. The static pressure then causes the conical surface to expand.
[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A detachable, quick-release pinion mounting device for a drilling rig rotary table, characterized in that, It includes a fast shaft (2) and a pinion (1) mounted on its shaft head. The pinion (1) is sleeved on the outer circumferential surface of the shaft head of the fast shaft (2). The two are fixedly connected by a keyless tapered structure.
2. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 1, characterized in that, The high-speed shaft (2) has an axial threaded hole A at the center of its shaft head. The high-speed shaft (2) has a radial oil passage B inside its shaft head. One end of the radial oil passage B is connected to the axial threaded hole A, and the other end is provided with an annular oil distribution groove C at the oil passage outlet. The annular oil distribution groove C is located on the outer circumferential surface of the high-speed shaft (2).
3. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 2, characterized in that, The annular oil distribution groove C is located at the middle of the outer conical surface of the fast shaft head in the axial direction.
4. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 1, characterized in that, The fast shaft (2) and the pinion (1) are connected by an interference fit.
5. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 3, characterized in that, The conical mating sections on both sides of the annular oil distribution groove C form a self-sealing structure for the pressure transmission medium under the interference fit between the fast shaft (2) and the pinion (1).
6. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 5, characterized in that, The axial threaded hole A is filled with an incompressible pressure transmission medium.
7. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 6, characterized in that, The pressure transmission medium includes soap or high-viscosity grease.
8. The easily detachable quick-release pinion mounting device for a drilling rig rotary table according to claim 7, characterized in that, The axial threaded hole A is used to screw a bolt of the same size into the hole, and the bolt is used to press the extruded medium. The medium is then extruded into the annular oil channel C through the radial oil channel B. Under the continuous screwing action of the bolt, the medium generates static pressure that can cause the fast shaft tapered surface to expand.