Split centering anti-falling repairable universal shaft

Abstract

The application relates to a split centering anti-falling repairable universal shaft and belongs to the technical field of universal shafts. The split centering anti-falling repairable universal shaft comprises an intermediate shaft, two split universal joints connected to two ends of the intermediate shaft, and the split universal joints comprise a first U-shaped universal body and a second U-shaped universal body which are mutually engaged. The first U-shaped universal body and the second U-shaped universal body are connected through a centering anti-falling shaft, one end of the centering anti-falling shaft is provided with a ball head body matched with an inner spherical surface of the first U-shaped universal body, the ball head body is relatively swing-connected with the spherical surface, the other end of the centering anti-falling shaft is coaxially fixed with the second U-shaped universal body, therefore, the increase of the gap between the first U-shaped universal body and the second U-shaped universal body after abrasion will not affect the engagement, and the first U-shaped universal body and the second U-shaped universal body will not be separated from each other, the centering and righting functions are ensured, and the overall anti-falling performance of the universal shaft is improved.

Description

Technical Field

[0001] This application relates to the field of universal joint technology, and in particular to a split-type, centering, anti-detachment, and repairable universal joint. Background Technology

[0002] Universal joints are commonly used in various industrial products and equipment. In the oil and gas drilling field, especially in screw drills, universal joints need to withstand extremely high torque loads and require safe, reliable, and stable operation over long periods. Traditional universal joints include open-type and sealed-type universal joints.

[0003] In related technologies, a common open-type universal joint is a petal-shaped universal joint disclosed in patent number CN200943650Y, which includes an intermediate body. Each end of the intermediate body is connected to a petal-shaped universal joint. Each universal joint includes a first petal body and a second petal body that mesh with each other. A universal torque transmission device is installed within the inner cavity of the first and second petal bodies. The universal torque transmission device includes a flexure, and several hinge devices are respectively provided between the first end of the flexure and the first petal body, and between the second end of the flexure and the second petal body.

[0004] A common type of sealed universal joint is a ball-sealed universal joint for screw drills disclosed in patent number CN205154060U. It includes two augers connected to the drill bit and the motor drive shaft, respectively, and a connecting rod connecting the two augers. A ball seat is installed in the inner hole where the augers and the connecting rod meet. The connecting rod corresponds to the ball seats at both ends and forms a ball socket. A hinge ball is installed in each of the two ball sockets. Multiple transmission balls are respectively set in the groove between the connecting rod and the two augers, so that the connecting rod swings around the hinge ball as the axis and transmits speed and torque. The two augers are locked to the connecting rod by a locking sleeve. A retaining ring, a sealing ring, a half ring, and a hole clamp are installed in sequence in the gap between the connecting rod and the locking sleeve to completely seal the augers, the locking sleeve and the connecting rod.

[0005] However, commonly used open universal joints often have a one-piece structure for the connector and petal teeth, which is complex to process and can only be treated by integral carburizing or nitriding. When subjected to alternating loads and large axial forces, the wear of the universal joint is easily aggravated. The fit between the universal joint and the universal joint after wear is poor, and the universal joint cannot play a role in centering and straightening. Moreover, the anti-drop performance is insufficient. At the same time, commonly used sealed universal joints are also prone to insufficient load-bearing capacity and anti-drop capability due to the space occupied by the seal. This results in short service life and insufficient safety of the screw drill using the universal joint. Summary of the Invention

[0006] This application provides a split-type centering and anti-detachment repairable universal joint to solve the problems in related technologies where the universal joint lacks centering and straightening functions and has insufficient anti-detachment performance, resulting in short service life and insufficient safety of screw drills.

[0007] This application provides a split-type, centering, anti-detachment, repairable universal joint, including:

[0008] intermediate shaft;

[0009] The split universal joint has two parts, which are respectively connected to the two ends of the intermediate shaft. The split universal joint includes a first U-shaped universal joint and a second U-shaped universal joint that mesh with each other. The intermediate shaft and one end of the first U-shaped universal joint are coaxially fixed.

[0010] The centering and anti-detachment shaft has a ball head at one end. The first U-shaped universal joint has an installation hole inside. The inner wall of the installation hole has a spherical surface that matches the ball head. The outer circular surface of the ball head and the spherical surface are connected to each other in a swinging manner. The other end of the centering and anti-detachment shaft is coaxially fixed with the second U-shaped universal joint.

[0011] In some embodiments, the end of the centering anti-detachment shaft away from the ball head is cylindrical, and the second U-shaped universal joint is provided with fasteners that coaxially fix the cylinder to the second U-shaped universal joint.

[0012] In some embodiments, the mounting hole is threaded to the intermediate shaft, and the diameter of the mounting hole at the end near the second U-shaped universal joint is larger than the diameter of the cylinder.

[0013] In some embodiments, a ball seat is provided in the mounting hole, and the intermediate shaft uses the ball seat to axially position the ball head body in the mounting hole.

[0014] In some embodiments, the first U-shaped universal joint has an oil injection hole for injecting grease into the surface of the ball head.

[0015] In some embodiments, the first U-shaped universal joint is provided with a sealing ring that is located away from the ball seat and is sealed to the ball head.

[0016] In some embodiments, one end of the first U-shaped universal joint has two mutually symmetrical first teeth, and one end of the second U-shaped universal joint has a second tooth that meshes with the two first teeth.

[0017] In some embodiments, both the first and second lobes surround the periphery of the cylinder.

[0018] In some embodiments, a groove is provided on an adjacent side of the first and second lobe teeth, and a wear-resistant alloy block protruding from the groove is provided in the groove.

[0019] In some embodiments, the wear-resistant alloy block has a flat side within the groove, and the opposite sides of adjacent wear-resistant alloy blocks form paired conjugate surfaces.

[0020] The beneficial effects of the technical solution provided in this application include:

[0021] This application provides a split-type centering and anti-detachment repairable universal joint. Since the first U-shaped universal joint and the second U-shaped universal joint are connected by a centering and anti-detachment shaft, one end of the centering and anti-detachment shaft is provided with a ball head that matches the inner spherical surface of the first U-shaped universal joint. The outer circular surface of the ball head and the spherical surface are connected to swing relative to each other. At the same time, the other end of the centering and anti-detachment shaft is coaxially fixed with the second U-shaped universal joint. Therefore, the increase in the gap between the first U-shaped universal joint and the second U-shaped universal joint after wear will not affect their meshing. At the same time, the first U-shaped universal joint and the second U-shaped universal joint will not detach from each other, which not only ensures the centering and straightening function, but also improves the overall anti-detachment performance of the universal joint. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0024] Figure 2 for Figure 2 A cross-sectional view along the AA direction;

[0025] Figure 3 for Figure 2 A cross-sectional view along the BB direction;

[0026] Figure 4 This is a schematic diagram of the structure of the wear-resistant alloy block according to an embodiment of this application;

[0027] Figure 5 This is a cross-sectional view of the wear-resistant alloy block according to an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of the first U-shaped universal joint according to an embodiment of this application.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Intermediate shaft; 2. Split universal joint; 21. First U-shaped universal joint; 211. First tooth; 22. Second U-shaped universal joint; 221. Second tooth; 3. Centering and anti-detachment shaft; 4. Mounting hole; 5. Ball seat; 6. Sealing ring; 7. Groove; 8. Wear-resistant alloy block; 9. Fastener. Detailed Implementation

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

[0032] This application provides a split-type centering and anti-detachment repairable universal joint, which can solve the problems in related technologies where the universal joint lacks centering and straightening function and has insufficient anti-detachment performance after the universal joint is worn, resulting in short service life and insufficient safety of screw drills.

[0033] See Figures 1 to 3 As shown, this application embodiment provides a split-type, centering, anti-detachment, repairable universal joint, including:

[0034] Intermediate shaft 1;

[0035] The split universal joint 2 consists of two parts, which are respectively connected to the two ends of the intermediate shaft 1. The split universal joint 2 includes a first U-shaped universal joint 21 and a second U-shaped universal joint 22 that mesh with each other. The intermediate shaft 1 and one end of the first U-shaped universal joint 21 are coaxially fixed.

[0036] The centering and anti-detachment shaft 3 has a ball head at one end. The first U-shaped universal joint 21 has a mounting hole 4 inside. The inner wall of the mounting hole 4 has a spherical surface that matches the ball head. The outer circular surface of the ball head and the spherical surface swing relative to each other. The other end of the centering and anti-detachment shaft 3 is coaxially fixed with the second U-shaped universal joint 22.

[0037] In this embodiment of the application, the two ends of the intermediate shaft 1 of the split centering anti-detachment repairable universal shaft are coaxially welded with a first U-shaped universal body 21. The first U-shaped universal body 21 and the second U-shaped universal body 22 mesh with each other and are coaxially connected through the centering anti-detachment shaft 3. The first U-shaped universal body 21 is provided with a mounting hole 4 inside. The inner wall of the mounting hole 4 is provided with a spherical surface adapted to the ball head. One end of the centering anti-detachment shaft 3 is a ball head adapted to the spherical surface. The outer circular surface of the ball head and the spherical surface are connected to swing relative to each other. The other end of the centering anti-detachment shaft 3 is coaxially fixed with the second U-shaped universal body 22.

[0038] In practical use, the end of the second U-shaped universal joint 22 furthest from the first U-shaped universal joint 21 is connected to the transmission rod inside the screw drill. The first U-shaped universal joint 21 and the second U-shaped universal joint 22 transmit torque through mutual meshing. Simultaneously, there is a meshing gap between the meshing surfaces. This gap can be eliminated by the relative swinging of the outer cylindrical surface of the ball head and the spherical surface, ensuring that the first U-shaped universal joint 21 and the second U-shaped universal joint 22 are not on the same axis. At the same time, the outer cylindrical surface of the ball head and the spherical surface cooperate. The other end of the centering and anti-disengagement shaft 3 is coaxially fixed to the second U-shaped universal joint 22. When the meshing surface between the first U-shaped universal joint 21 and the second U-shaped universal joint 22 wears, the first U-shaped universal joint and the second U-shaped universal joint 22... The increased gap between the two U-shaped universal joints will not affect their meshing. Due to the centering and anti-disengagement shaft 3, the first U-shaped universal joint 21 and the second U-shaped universal joint 22 will not be radially misaligned. The first U-shaped universal joint 21 and the second U-shaped universal joint 22 can still swing back to the same axis and can still squeeze and transmit torque, thus ensuring the overall centering and straightening function. At the same time, the outer surface of the ball head will not detach from the ball surface, and the other end of the centering and anti-disengagement shaft 3 will not detach from the second U-shaped universal joint 22, making it difficult for the first U-shaped universal joint 21 and the second U-shaped universal joint 22 to detach. Meanwhile, the intermediate shaft 1 is welded to the first U-shaped universal joint 21 and is not easy to detach, thus ensuring the overall anti-disengagement performance of the universal joint.

[0039] In some alternative embodiments: see Figures 1 to 2 As shown, this application embodiment provides a split-type centering anti-detachment repairable universal joint. The centering anti-detachment shaft 3 of the split-type centering anti-detachment repairable universal joint is cylindrical at the end away from the ball head. The second U-shaped universal joint 22 is provided with a fastener 9 that coaxially fixes the cylinder on the second U-shaped universal joint 22.

[0040] Mounting hole 4 is threaded to intermediate shaft 1. The diameter of the end of mounting hole 4 near the second U-shaped universal joint 22 is larger than the diameter of the cylinder.

[0041] In this embodiment of the application, the centering and anti-detachment repairable universal joint 3 has a cylindrical end away from the ball head. The second U-shaped universal joint 22 has a cylindrical groove for mounting the cylinder. The fastener 9 is a set screw. The second U-shaped universal joint 22 also has a threaded hole that is perpendicular to the cylindrical groove and is used to mount the set screw. The cylinder also has a slot that matches the set screw. The mounting hole 4 is threadedly connected to the intermediate shaft 1, which facilitates welding after the intermediate shaft 1 is installed. The diameter of the mounting hole 4 at the end near the second U-shaped universal joint 22 is larger than the diameter of the cylinder, so that the centering and anti-detachment shaft 3 has a degree of freedom of swing. In practical use, while the second U-shaped universal joint 22 engages with the first U-shaped universal joint 21, the cylindrical part of the centering anti-detachment shaft 3 is inserted into the cylindrical groove on the second U-shaped universal joint 22. Then, the set screw is installed into the threaded hole, and the end of the set screw abuts in the slot on the cylinder, thereby fixing the second U-shaped universal joint 22 and the centering anti-detachment shaft 3 together, ensuring that the centering anti-detachment shaft 3 and the second U-shaped universal joint 22 will not detach after installation. At the same time, when disassembly is required, the centering anti-detachment shaft 3 and the second U-shaped universal joint 22 can be disassembled.

[0042] In some alternative embodiments: see Figure 1 As shown in the figure, this application embodiment provides a split-type centering anti-detachment repairable universal joint. The mounting hole 4 of the split-type centering anti-detachment repairable universal joint is provided with a ball seat 5, and the intermediate shaft 1 is axially positioned in the mounting hole 4 by the ball seat 5.

[0043] In this embodiment of the application, a ball seat 5 is provided in the mounting hole 4 of the split-type centering anti-detachment repairable universal joint. The intermediate shaft 1 is axially positioned in the mounting hole 4 by the ball seat 5. The mounting hole 4 has a thread that matches the intermediate shaft 1. In specific use, the centering anti-detachment shaft 3 is inserted into the mounting hole 4 on the first U-shaped universal joint 21. The ball head on the centering anti-detachment shaft 3 abuts against the spherical surface provided on the mounting hole 4. Then, the ball seat 5 is placed in the mounting hole 4. One side of the ball seat 5 is a spherical surface and the other side is a flat surface. The intermediate shaft 1 is screwed into the mounting hole 4. The end face of the intermediate shaft 1 presses against the flat surface on the ball seat 5, so that the spherical surface on the ball seat 5 abuts against the ball head on the centering anti-detachment shaft 3, thereby positioning the ball head on the centering anti-detachment shaft 3. Then, the joint between the first U-shaped universal joint 21 and the intermediate shaft 1 is welded, thereby facilitating the positioning and installation of the centering anti-detachment shaft 3 and the welding of the joint between the intermediate shaft 1 and the first U-shaped universal joint 21.

[0044] In some alternative embodiments: see Figure 1 As shown, this application embodiment provides a split-type centering anti-detachment repairable universal joint, wherein the first U-shaped universal joint 21 of the split-type centering anti-detachment repairable universal joint is provided with an oil injection hole for injecting grease into the surface of the ball head;

[0045] The first U-shaped universal joint 21 is provided with a sealing ring 6 that is far away from the ball seat 5 and is sealed to the ball head.

[0046] In this embodiment of the application, the first U-shaped universal joint 21 of the split-type centering and anti-detachment repairable universal joint has an oil injection hole for injecting grease into the surface of the ball head. The first U-shaped universal joint 21 is provided with a sealing ring 6 that is located away from the ball seat 5 and is sealed to the ball head. An annular groove is provided in the mounting hole 4, and the sealing ring 6 is embedded in the annular groove. In actual use, grease is injected into the surface of the ball head through the oil injection hole. The grease penetrates between the surface of the ball head and the spherical surface of the mounting hole 4, providing lubrication. The sealing ring 6 and the ball seat 5 cooperate to prevent grease leakage. Simultaneously, the sealing ring 6 prevents mud from entering the mounting hole 4, ensuring smooth operation of the centering and anti-detachment shaft 3 within the first U-shaped universal joint 21. This reduces universal joint wear, extends the universal joint's service life, and prevents the screw drill from jamming. It should be noted that the oil injection hole is not shown in the diagram. Grease can also be pre-applied to the surface of the ball head or injected into the spherical position within the mounting hole 4 before assembly.

[0047] In some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a split-type centering anti-detachment repairable universal shaft. One end of the first U-shaped universal body 21 of the split-type centering anti-detachment repairable universal shaft has two mutually symmetrical first petal teeth 211, and one end of the second U-shaped universal body 22 has a second petal tooth 221 that meshes with the two first petal teeth 211.

[0048] The first tooth 211 and the second tooth 221 both surround the circumference of the cylinder.

[0049] In this embodiment of the split-type centering anti-detachment repairable universal joint, one end of the first U-shaped universal joint 21 protrudes to form two mutually symmetrical first tooth 211, and one end of the second U-shaped universal joint 22 protrudes to form a second tooth 221 that meshes with the two first tooth 211. Both the first tooth 211 and the second tooth 221 surround the circumference of the cylinder. In actual use, the first tooth 211 and the second tooth 221 mesh with each other and transmit torque through mutual compression. It should be noted that the split design differs from the inherent one-piece structure, which facilitates better reinforcement of the meshing surface. For the first U-shaped universal joint 21 and the second U-shaped universal joint 22, the number of teeth can be further optimized according to the actual situation, and flexible and diverse surface strengthening treatment technologies can also be adopted according to actual needs.

[0050] In some alternative embodiments: see Figures 1 to 6 As shown, this application embodiment provides a split-type centering anti-detachment repairable universal shaft. The first lobe tooth 211 and the second lobe tooth 221 of the split-type centering anti-detachment repairable universal shaft are provided with grooves 7 on adjacent sides, and wear-resistant alloy blocks 8 protruding from the grooves 7 are provided in the grooves 7.

[0051] The wear-resistant alloy block 8 has a flat side within the groove 7, and the opposite sides of adjacent wear-resistant alloy blocks 8 form paired conjugate surfaces.

[0052] In this embodiment of the split-centering anti-detachment repairable universal joint, grooves 7 are provided on adjacent sides of the first tooth 211 and the second tooth 221. Wear-resistant alloy blocks 8 protruding from the grooves 7 are welded inside the grooves 7. The side of the wear-resistant alloy block 8 located in the groove 7 is a plane, and the opposite sides of adjacent wear-resistant alloy blocks 8 form paired conjugate curved surfaces. In actual use, the wear-resistant alloy blocks 8 are located on the friction surface where the first tooth 211 and the second tooth 221 press against each other to transmit torque. The mutual friction between adjacent wear-resistant alloy blocks 8 replaces the mutual contact friction between the first tooth 211 and the second tooth 221, ensuring the wear resistance of the universal joint. After the wear-resistant alloy blocks 8 wear down, the first U-shaped universal joint 21 and the second U-shaped universal joint 22 can be disassembled, and the wear-resistant alloy blocks 8 on the first tooth 211 and the second tooth 221 can be disassembled and replaced. This allows the universal joint to be repeatedly repaired and reused, extending the service life of the universal joint.

[0053] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0054] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A split-type, centering, anti-detachment, repairable universal joint, characterized in that, include: Intermediate shaft (1); Two split universal joints (2) are connected to the two ends of the intermediate shaft (1) respectively. The split universal joint (2) includes a first U-shaped universal joint (21) and a second U-shaped universal joint (22) that mesh with each other. One end of the intermediate shaft (1) and the first U-shaped universal joint (21) are coaxially fixed. A centering and anti-detachment shaft (3) is provided with a ball head at one end. The first U-shaped universal joint (21) is provided with an installation hole (4). The inner wall of the installation hole (4) is provided with a spherical surface that is adapted to the ball head. The outer circular surface of the ball head and the spherical surface are connected to each other in a swinging manner. The other end of the centering and anti-detachment shaft (3) is coaxially fixed with the second U-shaped universal joint (22). The centering anti-detachment shaft (3) has a cylindrical end away from the ball head, and the second U-shaped universal joint (22) is provided with fasteners (9) that coaxially fix the cylinder to the second U-shaped universal joint (22). The mounting hole (4) is threaded to the intermediate shaft (1), and the diameter of the end of the mounting hole (4) near the second U-shaped universal joint (22) is larger than the diameter of the cylinder; A ball seat (5) is provided in the mounting hole (4), and the intermediate shaft (1) axially positions the ball head body in the mounting hole (4) through the ball seat (5); One side of the ball seat (5) is a spherical surface and the other side is a flat surface. The intermediate shaft (1) is connected to the mounting hole (4). The end face of the intermediate shaft (1) presses against the flat surface of the ball seat (5), so that the spherical surface of the ball seat (5) abuts against the ball head of the centering and anti-detachment shaft (3). One end of the first U-shaped universal joint (21) is formed with two mutually symmetrical first teeth (211), and one end of the second U-shaped universal joint (22) is formed with a second tooth (221) that meshes with the two first teeth (211). The first tooth (211) and the second tooth (221) are provided with grooves (7) on adjacent sides, and wear-resistant alloy blocks (8) protruding from the grooves (7) are provided in the grooves (7). The wear-resistant alloy block (8) is flat on one side within the groove (7), and the opposite sides of the adjacent wear-resistant alloy blocks (8) form paired conjugate surfaces.

2. The split-type centering anti-detachment repairable universal joint as described in claim 1, characterized in that: The first U-shaped universal joint (21) has an oil injection hole for injecting grease into the surface of the ball head.

3. A split-type, centering, anti-detachment, repairable universal joint as described in claim 1, characterized in that: The first tooth (211) and the second tooth (221) are both surrounding the circumference of the cylinder.

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