Gimbal assembly and screw-in drill string

Abstract

The application provides a universal shaft assembly and a screw drill. The universal shaft assembly comprises: a first end of a universal shaft having a first channel, a second end of the universal shaft having a second channel; a transmission shaft joint having a first oil outlet channel, a part of the transmission shaft joint being connected with a transmission shaft assembly, another part of the transmission shaft joint being sleeved on the first end of the universal shaft, and a first accommodating cavity being formed between the transmission shaft joint and the universal shaft, the first channel, the first oil outlet channel and the first accommodating cavity being communicated to enable lubricating oil to circulate in the first channel, the first oil outlet channel and the first accommodating cavity; a part of a rotor joint being connected with a motor assembly, another part of the rotor joint being sleeved on the second end of the universal shaft, a second accommodating cavity being formed between the rotor joint and the universal shaft, and ports of the second channel being communicated with the second accommodating cavity to enable lubricating oil to circulate in the second channel and the second accommodating cavity. The application solves the problem of insufficient lubrication in the universal shaft assembly of the screw drill in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling equipment, in particular to a universal shaft assembly and a screw drill. BACKGROUND

[0002] In the prior art, the lubrication mechanism of the universal shaft of the screw drill has significant limitations, which greatly shortens the service life of the screw drill under long-time and high-intensity working conditions. As the core transmission component of the screw drill, the lubrication of the universal shaft is directly related to the efficiency and reliability of the entire drill. However, the traditional universal shaft structure often lacks sufficient lubrication design. The lubricating materials, such as lubricating oil or grease, inside the traditional universal shaft often cannot be effectively circulated during use. This means that the lubricating materials may accumulate in certain areas, while other key contact surfaces lack the necessary lubrication, leading to increased wear and tear, and thus insufficient lubrication.

[0003] That is, the universal shaft assembly in the screw drill in the prior art has the problem of insufficient lubrication. SUMMARY

[0004] The main purpose of the present application is to provide a universal shaft assembly and a screw drill to solve the problem of insufficient lubrication of the universal shaft assembly in the screw drill in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a universal shaft assembly is provided, which comprises: a universal shaft housing having a containing space; a universal shaft located in the containing space, the first end of the universal shaft having a first channel, and the second end of the universal shaft having a second channel; a transmission shaft joint having a first oil outlet channel, a part of the transmission shaft joint being connected with a transmission shaft assembly, and another part of the transmission shaft joint being sleeved on the first end of the universal shaft, and a first containing cavity being formed between the transmission shaft joint and the universal shaft, the first channel, the first oil outlet channel and the first containing cavity being in communication, so that the lubricating oil circulates in the first channel, the first oil outlet channel and the first containing cavity; a rotor joint, a part of the rotor joint being connected with a motor assembly, and another part of the rotor joint being sleeved on the second end of the universal shaft, a second containing cavity being formed between the rotor joint and the universal shaft, and the ports of the second channel being in communication with the second containing cavity, so that the lubricating oil circulates in the second channel and the second containing cavity.

[0006] Further, the universal shaft further comprises: a third channel, both ends of the third channel being in communication with the first containing cavity and the second containing cavity respectively; and a fourth channel, both ends of the fourth channel being in communication with the first channel and the second channel respectively.

[0007] Further, the transmission shaft joint comprises a transmission shaft joint seat sleeved on the first end of the universal shaft, the transmission shaft joint seat has a first oil outlet channel, the first oil outlet channel is communicated with the first containing cavity, and the first oil outlet channel is communicated with the first channel; at least one first one-way valve is arranged at the connection between the first oil outlet channel and the first containing cavity; at least one second one-way valve is arranged in the first oil outlet channel and is arranged at intervals from the first one-way valve, and the first oil outlet channel between the first one-way valve and the second one-way valve serves as a first regulation space; and at least one first pressure regulating piece is movably arranged on the transmission shaft joint seat, and one part of the first pressure regulating piece is located outside the transmission shaft joint seat, and the other part of the first pressure regulating piece is located in the first regulation space.

[0008] Further, the inner wall surface of the universal shaft shell has a plurality of grooves and a plurality of boss structures, the plurality of grooves and the plurality of boss structures are arranged at intervals along the circumference of the universal shaft shell, and there is one boss structure between any two adjacent grooves, the first pressure regulating piece abuts against the inner wall surface of the universal shaft shell, and when the first pressure regulating piece rotates relative to the universal shaft shell, the first pressure regulating piece alternately abuts against the grooves and the boss structures to change the pressure in the first regulation space, thereby realizing oil suction and oil outlet.

[0009] Further, the rotor joint has a second oil outlet channel, the second oil outlet channel is communicated with the second channel and the second containing cavity.

[0010] Further, the rotor joint comprises a rotor joint seat sleeved on the second end of the universal shaft, the rotor joint seat has a second oil outlet channel, the second oil outlet channel is communicated with the second containing cavity, and the second oil outlet channel is communicated with the second channel; at least one rotor joint ball drum is movably arranged between the universal shaft and the rotor joint seat; at least one third one-way valve is arranged at the connection between the second oil outlet channel and the second containing cavity; at least one fourth one-way valve is arranged in the second oil outlet channel and is arranged at intervals from the third one-way valve, and the second oil outlet channel between the third one-way valve and the fourth one-way valve serves as a second regulation space; and at least one second pressure regulating piece is movably arranged on the rotor joint seat, and one part of the second pressure regulating piece is located in the second regulation space, and the second pressure regulating piece is used to change the pressure in the second regulation space, thereby realizing oil suction and oil outlet.

[0011] Further, the second pressure regulating piece comprises a first piston movably arranged in the second regulation space; and a connecting rod, a first end of the connecting rod is movably connected with the first piston, and a second end of the connecting rod is movably connected with the rotor joint ball drum, so that the first piston is driven to move to change the pressure in the second regulation space when the rotor joint ball drum moves.

[0012] Further, the rotor joint seat further comprises an auxiliary channel communicated with the motor assembly, and the second pressure regulating member comprises: a first piston movably arranged in the second regulating space; a driving member arranged in the auxiliary channel, and a part of the first piston is located in the auxiliary channel, and the mud in the motor assembly drives the driving member to rotate, thereby driving the first piston to move to change the pressure in the second regulating space.

[0013] Further, the driving member comprises: an impeller; a bearing, a central shaft of the impeller is connected with the bearing; a cam structure, the cam structure is connected with the central shaft of the impeller, and the cam structure rotates with the impeller, and the cam structure is in contact with an end of the first piston located in the auxiliary channel, so that the first piston is extended and retracted in the second regulating space.

[0014] According to another aspect of the present application, a screw drill is provided, comprising a drop prevention assembly, a motor assembly, a universal shaft assembly and a transmission shaft assembly connected in sequence, and the universal shaft assembly is the universal shaft assembly mentioned above.

[0015] By using the technical scheme of the present application, the universal shaft assembly comprises a universal shaft shell, a universal shaft, a transmission shaft joint and a rotor joint, the universal shaft shell has an accommodating space; the universal shaft is located in the accommodating space, a first end of the universal shaft has a first channel, and a second end of the universal shaft has a second channel; the transmission shaft joint has a first oil outlet channel, a part of the transmission shaft joint is connected with the transmission shaft assembly, another part of the transmission shaft joint is sleeved on the first end of the universal shaft, and a first accommodating cavity is formed between the transmission shaft joint and the universal shaft, the first channel, the first oil outlet channel and the first accommodating cavity are communicated, so that the lubricating oil circulates in the first channel, the first oil outlet channel and the first accommodating cavity; a part of the rotor joint is connected with the motor assembly, another part of the rotor joint is sleeved on the second end of the universal shaft, a second accommodating cavity is formed between the rotor joint and the universal shaft, and the ports of the second channel are all communicated with the second accommodating cavity, so that the lubricating oil circulates in the second channel and the second accommodating cavity.

[0016] The first oil outlet channel is arranged on the transmission shaft joint, the first channel is arranged on the universal shaft, the first circulating channel is formed among the first oil outlet channel, the first channel and the first containing cavity, the lubricating oil can flow in the first circulating channel, so as to lubricate the contact position of the universal shaft and the transmission shaft joint. Meanwhile, the second channel is arranged on the universal shaft, the lubricating oil can lubricate the contact position of the universal shaft and the rotor joint, which is beneficial to improve the sufficiency of lubrication of the internal structure of the universal shaft assembly, and effectively reduces the wear. The first channel and the second channel are arranged on the first end and the second end of the universal shaft respectively, and are communicated with the first containing cavity and the second containing cavity, so that the lubricating oil can be accurately and continuously supplied to the friction parts of the universal shaft assembly, such as the ball drum and the circular surface of the universal shaft. The circulating lubrication mechanism can effectively reduce the wear and prolong the service life of the parts. The lubricating oil path is integrated in the universal shaft shell and the universal shaft inside, and the connection between the transmission shaft joint and the rotor joint and the universal shaft, which reduces the demand for external lubricating oil path, makes the overall structure more compact, reduces the volume and weight of the screw drill, and improves the operation flexibility and efficiency of the screw drill in narrow space or high load conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein for explanation by referring to the exemplary embodiments thereof and together with the general description of the application given above, and wherein:

[0018] Figure 1 Part of the structure schematic diagram of the screw drill of one optional embodiment of the application is shown;

[0019] Figure 2 Part of the structure schematic diagram of the universal shaft assembly of another optional embodiment of the application is shown; Figure 1 Enlarged view of P in FIG. 4 is shown;

[0020] Figure 3 Enlarged view of Q in FIG. 5 is shown; Figure 2

[0021] Enlarged view of T in FIG. 6 is shown; Figure 4 Figure 3 Enlarged view of N in FIG. 7 is shown;

[0022] Figure 5 Enlarged view of S in FIG. 8 is shown;

[0023] Figure 6 Figure 5 Enlarged view of S in FIG. 8 is shown;

[0024] Figure 7 Enlarged view of S in FIG. 8 is shown; Figure 6

[0025] Figure 8 ​​​Fig. 2 shows a partial structural schematic diagram of a screw drill showing another alternative embodiment of the present application;

[0026] Figure 9 Fig. 3 shows a partial structural schematic diagram of a screw drill showing another alternative embodiment of the present application; Figure 8 Fig. 4 shows an enlarged view of the portion M in Fig. 3;

[0027] Figure 10 Fig. 5 shows an enlarged view of the portion W in Fig. 3; Figure 9 Fig. 6 shows an enlarged view of the portion W in Fig. 4;

[0028] Figure 11 Fig. 7 shows a structural schematic diagram of a cam structure; Figure 9 Fig. 8 shows a structural schematic diagram of a cam structure;

[0029] Figure 12 Fig. 9 shows a schematic diagram of a cooperation relationship between a universal shaft housing and a first pressure regulating member of an alternative embodiment of the present application;

[0030] Figure 13 Fig. 10 shows a schematic diagram of another cooperation relationship between a universal shaft housing and a first pressure regulating member of an alternative embodiment of the present application;

[0031] Figure 14 Fig. 11 shows a schematic diagram of a cooperation relationship between a universal shaft housing and a first pressure regulating member of another alternative embodiment of the present application.

[0032] In the above figures, the following reference signs are used:

[0033] 10, universal shaft housing; 11, accommodating space; 12, groove; 13, boss structure; 20, universal shaft; 21, first passage; 211, first sub-passage; 212, second sub-passage; 22, second passage; 221, third sub-passage; 222, fourth sub-passage; 23, third passage; 24, fourth passage; 30, transmission shaft joint; 31, first oil outlet passage; 311, first return sub-passage; 32, transmission shaft joint seat; 33, first one-way valve; 34, second one-way valve; 35, first pressure regulating member; 40, first accommodating cavity; 50, rotor joint; 51, second oil outlet passage; 52, rotor joint seat; 53, rotor joint ball drum; 54, third one-way valve; 55, fourth one-way valve; 56, second pressure regulating member; 561, first piston; 562, connecting rod; 563, driving member; 564, impeller; 565, bearing; 566, cam structure; 60, second accommodating cavity; 70, first regulating space; 80, second regulating space; 90, auxiliary passage; 100, anti-drop assembly; 101, anti-drop nut; 102, anti-drop rod; 200, motor assembly; 300, universal shaft assembly; 400, transmission shaft assembly. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0036] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0037] In order to solve the problem of insufficient lubrication of the universal shaft assembly in the screw drill in the prior art, the present application provides a universal shaft assembly and a screw drill.

[0038] As shown in Figures 1 to 14 The universal shaft assembly 300 includes a universal shaft housing 10, a universal shaft 20, a transmission shaft joint 30 and a rotor joint 50, the universal shaft housing 10 has a containing space 11; the universal shaft 20 is located in the containing space 11, the first end of the universal shaft 20 has a first channel 21, and the second end of the universal shaft 20 has a second channel 22; the transmission shaft joint 30 has a first oil outlet channel 31, a part of the transmission shaft joint 30 is connected with the transmission shaft assembly 400, another part of the transmission shaft joint 30 is sleeved on the first end of the universal shaft 20, and a first containing cavity 40 is formed between the transmission shaft joint 30 and the universal shaft 20, the first channel 21, the first oil outlet channel 31 and the first containing cavity 40 are communicated, so that the lubricating oil circulates in the first channel 21, the first oil outlet channel 31 and the first containing cavity 40; a part of the rotor joint 50 is connected with the motor assembly 200, another part of the rotor joint 50 is sleeved on the second end of the universal shaft 20, a second containing cavity 60 is formed between the rotor joint 50 and the universal shaft 20, and the ports of the second channel 22 are all communicated with the second containing cavity 60, so that the lubricating oil circulates in the second channel 22 and the second containing cavity 60.

[0039] By setting the first oil outlet channel 31 on the transmission shaft joint 30 and the first channel 21 on the universal shaft 20, a first circulation channel is formed between the first oil outlet channel 31, the first channel 21 and the first containing cavity 40, so that the lubricating oil can flow in the first circulation channel to lubricate the contact position of the universal shaft 20 and the transmission shaft joint 30. At the same time, by setting the second channel 22 on the universal shaft 20, the lubricating oil can lubricate the contact position of the universal shaft 20 and the rotor joint 50, which helps to improve the sufficiency of the internal structure lubrication of the universal shaft assembly and effectively reduces the wear. By setting the first channel 21 and the second channel 22 on the first end and the second end of the universal shaft 20 respectively, and connecting with the first containing cavity 40 and the second containing cavity 60, it ensures that the lubricating oil can be accurately and continuously supplied to the friction parts of the universal shaft assembly, such as the ball drum and the circular arc surface of the universal shaft 20. This circulating lubrication mechanism can effectively reduce wear and improve the service life of the components. Integrating the lubricating oil circuit inside the universal shaft housing 10 and the universal shaft 20, as well as the connection between the transmission shaft joint 30 and the rotor joint 50 and the universal shaft 20, reduces the need for external lubricating oil circuit, making the overall structure more compact, reducing the volume and weight of the screw drill, and improving its operation flexibility and efficiency in narrow space or high load conditions.

[0040] In addition, the built-in lubrication system reduces the dependence on external lubrication points, reduces the frequency and complexity of regular lubrication maintenance, and also reduces the opportunity for external contaminants to enter the internal lubrication system, improving the reliability of the screw drill and reducing maintenance costs. The efficient lubrication of the universal shaft assembly not only reduces the wear between components, but also reduces the temperature during operation, reduces thermal stress, protects materials from thermal damage, and further enhances the performance and working life of the screw drill.

[0041] In some optional embodiments, please refer to Figures 1 to 3The third passage 23 and the fourth passage 24 are configured to circulate the lubricating oil between the transmission shaft joint 30 and the rotor joint 50. The third passage 23 is in communication with the first receiving cavity 40 and the second receiving cavity 60, which allows the lubricating oil to flow between the first receiving cavity 40 and the second receiving cavity 60 at both ends of the universal shaft, ensuring uniform and sufficient lubrication throughout the universal shaft area. This all-around lubrication coverage can reduce the wear difference between different parts and prolong the overall service life of the universal shaft assembly. The fourth passage 24 is in communication with the first passage 21 and the second passage 22, which enhances the circulation path of the lubricating oil inside the universal shaft 20 and improves the lubrication efficiency. Even at high-speed rotation or under complex working conditions, the continuous and effective redistribution of the lubricating oil can be ensured to prevent local dryness.

[0042] In addition, through the circulation of the third passage 23 and the fourth passage 24, the lubricating oil not only has a lubricating effect but also effectively carries away the heat generated at each part, achieving balanced distribution of heat throughout the universal shaft assembly. This helps to maintain the universal shaft 20 and the surrounding components to work in a relatively stable thermal environment, avoiding damage caused by overheating. The integration of additional oil paths reduces the dependence on external lubrication systems and simplifies the overall design. This means that the screw drill can work in more severe environments without the need for frequent external maintenance or complex lubrication management, improving the adaptability and reliability of the equipment.

[0043] In some optional embodiments, please refer to Figure 3 and Figure 4The transmission shaft joint 30 comprises a transmission shaft joint seat 32, at least one first one-way valve 33, at least one second one-way valve 34, and at least one first pressure regulating piece 35. The transmission shaft joint seat 32 is sleeved on the first end of the universal shaft 20. The transmission shaft joint seat 32 has a first oil outlet channel 31. The first oil outlet channel 31 is in communication with the first containing cavity 40 and the first channel 21. The first one-way valve 33 is arranged at the connection between the first oil outlet channel 31 and the first containing cavity 40. The second one-way valve 34 is arranged in the first oil outlet channel 31 and is arranged separately from the first one-way valve 33. The first oil outlet channel 31 between the first one-way valve 33 and the second one-way valve 34 serves as a first regulating space 70. The first pressure regulating piece 35 is movably arranged on the transmission shaft joint seat 32. A part of the first pressure regulating piece 35 is located outside the transmission shaft joint seat 32, and the other part of the first pressure regulating piece 35 is located in the first regulating space 70. The cooperation of the first one-way valve 33 and the second one-way valve 34 can accurately control the flow direction of the lubricating oil in the first circulating channel formed by the first oil outlet channel 31, the first channel 21, and the first containing cavity 40, prevent the lubricating oil from flowing in reverse, and enable the first regulating space 70 to realize oil absorption and oil outlet, so as to form the circulation of the lubricating oil in the first circulating channel. This design optimizes the layout of the oil circuit and the lubrication process, reduces the invalid residence time of the lubricating oil in the flow channel, improves the circulation rate of the lubricating oil, and ensures the lubrication efficiency of the key parts of the universal shaft. In particular, under the communication of the first channel 21 and the first oil outlet channel 31, the flowability of the lubricating oil is greatly enhanced, and the lubrication effect is more outstanding.

[0044] Due to the design of the transmission shaft joint 30, the oil pressure and oil flow can be accurately and stably controlled, mechanical impact caused by unstable oil pressure or wear caused by poor lubrication can be effectively avoided, the service life of the transmission shaft joint and related components is significantly prolonged, and the durability of the entire screw drill system is indirectly improved.

[0045] In some optional embodiments, please refer to Figures 12 to 14The inner wall surface of the universal shaft housing 10 has a plurality of grooves 12 and a plurality of boss structures 13, which are arranged along the circumference of the universal shaft housing 10 and have one boss structure 13 between any two adjacent grooves 12. The first pressure regulating component 35 abuts against the inner wall surface of the universal shaft housing 10. When the first pressure regulating component 35 rotates relative to the universal shaft housing 10, it alternately abuts against the grooves 12 and the boss structures 13 to change the pressure in the first regulating space 70, thereby achieving oil absorption and oil discharge. When the first pressure regulating component 35 rotates relative to the universal shaft housing 10, it alternately abuts against the grooves 12 and the boss structures 13. This dynamic contact changes the volume of the first regulating space 70, thereby dynamically adjusting the oil pressure in the first regulating space 70. For example, when the first pressure regulating component 35 abuts against the boss structures 13, the volume of the first regulating space 70 decreases, thereby increasing the oil pressure and facilitating oil discharge; when the first pressure regulating component 35 abuts against the grooves 12, the volume of the space increases, thereby reducing the oil pressure and facilitating oil absorption. This automatic adjustment mechanism ensures the continuous circulation of lubricating oil and maintains the lubrication balance of the system.

[0046] By the alternating contact of the grooves 12 and the boss structures 13, the pressure in the first regulating space 70 is adjusted, which can effectively control the flow rate and direction of lubricating oil, avoid the stagnation and waste of excessive lubricating oil, and improve the overall efficiency of the lubrication system. Compared with the traditional method of adjusting oil pressure, the use of the grooves 12 and the boss structures 13 on the universal shaft housing 10 and the rotational movement of the first pressure regulating component 35 to automatically adjust the oil pressure simplifies the mechanical structure, reduces additional adjustment components, and reduces the complexity and cost of the equipment. In addition, dynamic oil pressure adjustment ensures effective lubrication inside the universal shaft assembly under any working condition, reducing friction and wear. This not only improves the reliability of the universal shaft assembly, but also significantly prolongs its service life.

[0047] In some optional embodiments, the grooves 12 are arc-shaped grooves, and the boss structures 13 are arc-shaped protrusions, please refer to Figure 12 and Figure 13 .

[0048] In other optional embodiments, the grooves 12 are V-shaped grooves, and the boss structures 13 are planar structures that protrude relative to the grooves 12, please refer to Figure 14 .

[0049] In some optional embodiments, please refer to Figure 3 and Figure 4The first passage 21 has at least one first sub-passage 211 and at least one second sub-passage 212, the first sub-passage 211 extends along the radial direction of the universal shaft 20, two ends of the first sub-passage 211 are communicated with the outer circumferential surface of the universal shaft 20 and the first accommodating cavity 40 respectively, one end of the second sub-passage 212 is communicated with the middle part of the first sub-passage 211, and the other end of the second sub-passage 212 is communicated with the middle part of the first oil outlet passage 31.

[0050] In some optional embodiments, referring to Figures 12 to 14 The first oil outlet passage 31 includes at least one first return sub-passage 311, each first return sub-passage 311 extends along the radial direction of the transmission shaft joint seat 32, and two ends of each first return sub-passage 311 are communicated with the outer wall surface of the transmission shaft joint seat 32, each first return sub-passage 311 is provided with a first pressure regulating piece 35 at each port, and two second one-way valves 34 are arranged in each first return sub-passage 311, the two second one-way valves 34 are arranged one by one corresponding to the two first pressure regulating pieces 35, and the second one-way valve 34 is close to the middle part of the transmission shaft joint seat 32 relative to the first pressure regulating piece 35. The passage in the first oil outlet passage 31 between the second one-way valve 34 and the first pressure regulating piece 35 is communicated with the first accommodating cavity 40, and serves as the first regulation space 70.

[0051] Optionally, when the first pressure regulating piece 35 abuts against the boss structure 13, the first pressure regulating piece 35 moves along the first return sub-passage 311 to the center of the transmission shaft joint seat 32, increases the pressure in the first regulation space 70, and then makes the second one-way valve 34 open under the action of high pressure, so that the lubricating oil flows into the middle part of the first return sub-passage 311 and then flows into the first accommodating cavity 40 through the first passage 21 to lubricate the connection position of the transmission shaft joint 30 and the universal shaft 20. When the first pressure regulating piece 35 abuts against the groove 12, the first pressure regulating piece 35 moves along the first return sub-passage 311 to the outside of the transmission shaft joint seat 32, reduces the pressure in the first regulation space 70, and then makes the first one-way valve 33 open when the first regulation space 70 is low pressure, so that the lubricating oil flows into the first regulation space 70.

[0052] In Figures 12 to 14 the specific embodiments shown, the first oil outlet passage 31 has a plurality of first return sub-passages 311, and the centers of the plurality of first return sub-passages 311 intersect at one point.

[0053] Optionally, the number of the first pressure regulating pieces 35, the boss structures 13 and the grooves 12 is the same.

[0054] In some optional embodiments, the lubricating oil circulation at the rotor joint 50 is independent of the lubricating oil circulation at the transmission shaft joint 30.

[0055] In some optional embodiments, referring toFigure 6 、 Figure 7 、 Figure 9 and Figure 10 The rotor joint 50 has a second oil outlet channel 51, which is in communication with the second channel 22 and the second accommodating cavity 60. The addition of the second oil outlet channel 51 forms another complete lubrication circulation system with the second channel 22 and the second accommodating cavity 60, so that the lubricating oil circulation at the two ends of the universal shaft 20 is independent of each other and does not interfere with each other. Even if the lubricating oil circulation at one end of the universal shaft 20 has a problem, it will not affect the lubricating oil circulation at the other end.

[0056] In some optional embodiments, please refer to Figure 6 、 Figure 7 、 Figure 9 and Figure 10 The second channel 22 has at least one third sub-channel 221 and at least one fourth sub-channel 222. The third sub-channel 221 extends along the radial direction of the universal shaft 20, and the two ends of the third sub-channel 221 are respectively in communication with the outer circumferential surface of the universal shaft 20 and the second accommodating cavity 60. One end of the fourth sub-channel 222 is in communication with the middle part of the third sub-channel 221, and the other end of the fourth sub-channel 222 is in communication with the middle part of the second oil outlet channel 51.

[0057] In some optional embodiments, please refer to Figure 6 、 Figure 7 、 Figure 9 and Figure 10The rotor joint 50 includes a rotor joint seat 52, at least one rotor joint ball drum 53, at least one third one-way valve 54, and at least one fourth one-way valve 55. The rotor joint seat 52 is sleeved on the second end of the universal shaft 20. The rotor joint seat 52 has a second oil outlet channel 51 that communicates with the second containing cavity 60 and the second channel 22. The rotor joint ball drum 53 is movably arranged between the universal shaft 20 and the rotor joint seat 52. The third one-way valve 54 is arranged at the connection between the second oil outlet channel 51 and the second containing cavity 60. The fourth one-way valve 55 is arranged in the second oil outlet channel 51 and is spaced apart from the third one-way valve 54. The second oil outlet channel 51 between the third one-way valve 54 and the fourth one-way valve 55 serves as a second regulation space 80. A second pressure regulating member 56 is movably arranged on the rotor joint seat 52, and a portion of the second pressure regulating member 56 is located in the second regulation space 80. The second pressure regulating member 56 is used to change the pressure in the second regulation space 80 to achieve oil suction and oil outlet. The establishment of the second oil outlet channel 51 connects the second containing cavity 60 and the second channel 22, forming a closed-loop lubrication system. This allows the lubricating oil to circulate between the universal shaft 20 and the rotor joint 50, ensuring that all frictional parts can be uniformly and continuously lubricated, thereby improving the operating efficiency and durability of the drilling tool. The spaced arrangement of the third one-way valve 54 and the fourth one-way valve 55, as well as the second regulation space 80 between them, allows the flow direction and pressure of the lubricating oil to be precisely controlled. The use of the third one-way valve 54 and the fourth one-way valve 55 in combination can effectively control the circulation rate and pressure of the lubricating oil in the second oil outlet channel 51, the second containing cavity 60, and the second channel 22, ensuring the stability and efficiency of the lubrication system. The second pressure regulating member 56 is designed to be movably arranged and can change its position in the second regulation space 80. When the screw drill is working, the second pressure regulating member 56 automatically adjusts its position in the second regulation space 80 according to the movement state of the universal shaft 20 and the rotor joint ball drum 53, thereby changing the oil pressure in the second regulation space 80 to achieve automatic oil suction and oil outlet of the lubricating oil without external intervention.

[0058] In some alternative embodiments, referring to Figure 6The second pressure regulating component 56 includes a first piston 561 movably arranged in the second regulating space 80 and a connecting rod 562. The first end of the connecting rod 562 is movably connected to the first piston 561, and the second end of the connecting rod 562 is movably connected to the rotor joint ball drum 53, so as to drive the first piston 561 to move and change the pressure in the second regulating space 80 when the rotor joint ball drum 53 moves. The first piston 561 is movably connected to the first end of the connecting rod 562, and the second end of the connecting rod 562 is connected to the rotor joint ball drum 53. When the rotor joint ball drum 53 moves due to changes in external working conditions, it drives the first piston 561 to move in the second regulating space 80 through the connecting rod 562, thereby changing the oil pressure in the second regulating space 80 and realizing oil absorption and oil discharge. This linkage mechanism enables the movement of the first piston 561 to automatically adjust the oil pressure in the second regulating space 80 without the need for external control or manual intervention.

[0059] In addition, the movement of the first piston 561 changes the volume of the second regulating space 80, thereby affecting the oil pressure in the space. When the first piston 561 gradually exits the second regulating space 80, the volume of the second regulating space 80 increases, and the oil pressure decreases, which is conducive to the entry of lubricating oil into the second regulating space 80. When the first piston 561 gradually enters the second regulating space 80, the volume of the second regulating space 80 decreases, and the oil pressure increases, which is conducive to the flow of lubricating oil from the second regulating space 80 to the second accommodating cavity 60. Automatic oil pressure adjustment avoids mechanical impact and excessive wear caused by abnormal oil pressure, ensures that the rotor joint ball drum 53, the universal shaft 20 and their connecting components are properly lubricated under various working conditions, prolongs the service life of the equipment, and improves the reliability and durability of the drilling tool.

[0060] Compared with the traditional oil pressure regulating method, the design of the first piston 561 and the connecting rod 562 simplifies the regulating components, reduces the complexity of the equipment, and reduces the difficulty and cost of maintenance. At the same time, this design is more compact in space, which helps to reduce the overall volume of the screw drill and improve portability and operational flexibility.

[0061] In other optional embodiments, please refer to Figure 9The rotor joint seat 52 further comprises an auxiliary channel 90 in communication with the motor assembly 200, and the second pressure regulating member 56 comprises a first piston 561 movably arranged in the second regulating space 80 and a driving member 563 arranged in the auxiliary channel 90, with a portion of the first piston 561 located in the auxiliary channel 90. A portion of the mud flows through the anti-drop cap 101, the anti-drop rod 102, and the channel in the motor assembly 200 to the driving member 563, driving the driving member 563 to rotate and in turn drive the first piston 561 to move and change the pressure in the second regulating space 80. The establishment of the auxiliary channel 90 enables the mud in the motor assembly 200 to enter and affect the driving member 563, which converts the energy of mud flow into power to drive the first piston 561. When the mud flows through the auxiliary channel 90, the driving member 563 (which can be an impeller or turbine) rotates, in turn driving the first piston 561 connected thereto to move in the second regulating space 80. This design ingeniously utilizes the mud flow during the operation of the drilling tool, without the need for an additional power source, achieving automatic adjustment of the oil pressure of the lubricating oil. The movement of the first piston 561 directly changes the volume of the second regulating space 80, thereby adjusting the oil pressure in the space. Through this precise oil pressure control, it can be ensured that the universal shaft 20 is fully lubricated under high load or complex working conditions, avoiding wear or performance degradation caused by unstable oil pressure.

[0062] Since the movement of the first piston 561 is directly driven by the flow rate and direction of the mud, the system can quickly respond to changes in the working state of the drilling tool and adjust the oil pressure in time, improving the response speed and flexibility of the lubrication system. This is particularly important for sudden changes in geological conditions or rapid adjustments in drilling tool operation, helping to maintain stable operation of the equipment.

[0063] In some optional embodiments, please refer to Figure 9 and Figure 10The driving member 563 includes an impeller 564, a bearing 565, and a cam structure 566. The central shaft of the impeller 564 is connected with the bearing 565. The cam structure 566 is connected with the central shaft of the impeller 564 and rotates with the impeller 564. The cam structure 566 contacts with the end of the first piston 561 located in the auxiliary channel 90 to make the first piston 561 extend and retract in the second regulating space 80. The impeller 564 is arranged in the auxiliary channel 90. When the fluid (such as mud) passes through the auxiliary channel 90, the impeller 564 can capture the kinetic energy of the fluid and convert it into rotational motion. This design ingeniously utilizes the energy of fluid flow during the operation of the drilling tool, without the need for additional power input, achieving self-sufficiency of oil pressure regulation of lubricating oil. The central shaft of the impeller 564 is connected with the bearing 565. The use of the bearing 565 ensures the stability and low friction of the rotation of the impeller 564. Even in the case of high flow rate or fluid condition changes, the impeller 564 can maintain stable rotation, ensuring the reliability and stability of the driving member. The cam structure 566 is connected with the central shaft of the impeller 564 and rotates with the impeller 564. The profile design of the cam structure 566 enables it to contact with the end of the first piston 561 and push the first piston 561 to extend and retract in the second regulating space 80 when it rotates. This design precisely controls the displacement of the first piston 561 through the rotational motion of the cam structure 566, thereby precisely regulating the volume and oil pressure of the second regulating space 80, achieving precise control of the lubricating system.

[0064] In some optional embodiments, the screw drill includes a drop-proof assembly 100, a motor assembly 200, a universal shaft assembly 300, and a transmission shaft assembly 400 connected in sequence, and the universal shaft assembly 300 is the universal shaft assembly described above. As a key component of the screw drill, the unique lubrication structure design of the universal shaft assembly 300 ensures efficient lubrication during drilling, thereby improving the reliability and service life of the entire drilling tool. By sequentially connecting each assembly, a highly coordinated and tightly integrated system is formed. The drop-proof assembly 100 ensures the safe connection of the drilling tool and the drill pipe, the motor assembly 200 provides power, the universal shaft assembly 300 achieves flexible steering and torque transmission, and the transmission shaft assembly 400 is responsible for the final transmission of power. This design ensures effective connection and cooperative work of each part of the system, improving overall efficiency. In particular, the lubrication optimization of the universal shaft assembly 300 adopts innovative designs such as internal flow channels, pistons, connecting rods, one-way valves, and pressure regulating components, achieving automatic oil pressure regulation and efficient lubrication circulation, greatly extending the service life of the universal shaft, reducing maintenance requirements, and improving the reliability and economy of the drilling tool.

[0065] During operation, as the universal shaft 20 rotates, the first pressure regulating component 35 reciprocates under the action of the boss structure 13 and the groove 12, driving the lubricating oil to circulate inside and outside the universal shaft 20, effectively lubricating the connection parts of the universal shaft 20.

[0066] Optionally, the first pressure regulating member 35 and the first piston 561 both have a reset member, such as a spring.

[0067] Optionally, the screw drill can be a large-torque screw drill, and the universal shaft assembly 300 can be applied to the large-torque screw drill.

[0068] Obviously, the above-described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should belong to the protection scope of the present application.

[0069] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0070] It should be noted that the terms "first", "second", and the like used in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0071] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cardan shaft assembly, characterized by, The universal shaft assembly (300) comprises: a universal shaft housing (10) having a receiving space (11); a universal shaft (20) located in the receiving space (11), the first end of the universal shaft (20) having a first passage (21), and the second end of the universal shaft (20) having a second passage (22); a transmission shaft joint (30) having a first oil outlet passage (31), a part of the transmission shaft joint (30) being connected with a transmission shaft assembly (400), and another part of the transmission shaft joint (30) being sleeved on the first end of the universal shaft (20), and a first receiving cavity (40) being formed between the transmission shaft joint (30) and the universal shaft (20), the first passage (21), the first oil outlet passage (31) and the first receiving cavity (40) being in communication, so that the lubricating oil circulates in the first passage (21), the first oil outlet passage (31) and the first receiving cavity (40); a rotor joint (50), a part of the rotor joint (50) being connected with a motor assembly (200), and another part of the rotor joint (50) being sleeved on the second end of the universal shaft (20), a second receiving cavity (60) being formed between the rotor joint (50) and the universal shaft (20), and the ports of the second passage (22) being in communication with the second receiving cavity (60), so that the lubricating oil circulates in the second passage (22) and the second receiving cavity (60); the transmission shaft joint (30) comprises: a transmission shaft joint seat (32) sleeved on the first end of the universal shaft (20), the transmission shaft joint seat (32) having the first oil outlet passage (31), the first oil outlet passage (31) being in communication with the first receiving cavity (40), and the first oil outlet passage (31) being in communication with the first passage (21); at least one first check valve (33) arranged at the connection between the first oil outlet passage (31) and the first receiving cavity (40); at least one second check valve (34) arranged in the first oil outlet passage (31) and spaced apart from the first check valve (33), the first oil outlet passage (31) between the first check valve (33) and the second check valve (34) serving as a first regulating space (70); at least one first pressure regulating member (35) movably arranged on the transmission shaft joint seat (32), a part of the first pressure regulating member (35) being located outside the transmission shaft joint seat (32), and another part of the first pressure regulating member (35) being located in the first regulating space (70).

2. The universal shaft assembly of claim 1, wherein, the universal shaft (20) further comprises: a third passage (23) having two ends in communication with the first receiving cavity (40) and the second receiving cavity (60), respectively; A fourth channel (24) is in communication with the first channel (21) and the second channel (22) at two ends thereof.

3. The universal shaft assembly of claim 1, wherein, The inner wall surface of the universal shaft shell (10) has a plurality of grooves (12) and a plurality of boss structures (13), the plurality of grooves (12) and the plurality of boss structures (13) are arranged at intervals along the circumference of the universal shaft shell (10), and there is one boss structure (13) between any two adjacent grooves (12), the first pressure regulating member (35) abuts against the inner wall surface of the universal shaft shell (10), and when the first pressure regulating member (35) rotates relative to the universal shaft shell (10), the first pressure regulating member (35) alternately abuts against the grooves (12) and the boss structures (13) to change the pressure in the first regulating space (70), thereby realizing oil suction and oil discharge.

4. The universal shaft assembly of claim 1, wherein, The rotor joint (50) has a second oil discharge channel (51) in communication with the second channel (22) and the second accommodating cavity (60).

5. The universal shaft assembly of claim 4, wherein, The rotor joint (50) comprises: A rotor joint seat (52) is sleeved on the second end of the universal shaft (20), the rotor joint seat (52) has the second oil discharge channel (51) in communication with the second accommodating cavity (60), and the second oil discharge channel (51) is in communication with the second channel (22); At least one rotor joint ball drum (53) is movably arranged between the universal shaft (20) and the rotor joint seat (52); At least one third one-way valve (54) is arranged at the connection between the second oil discharge channel (51) and the second accommodating cavity (60); At least one fourth one-way valve (55) is arranged in the second oil discharge channel (51) and spaced apart from the third one-way valve (54), and the second oil discharge channel (51) between the third one-way valve (54) and the fourth one-way valve (55) serves as a second regulating space (80); At least one second pressure regulating member (56) is movably arranged on the rotor joint seat (52), and a part of the second pressure regulating member (56) is located in the second regulating space (80), the second pressure regulating member (56) is used to change the pressure in the second regulating space (80) to realize oil suction and oil discharge.

6. The universal shaft assembly of claim 5, wherein, The second pressure regulating member (56) comprises: A first piston (561) is movably arranged in the second regulating space (80); A connecting rod (562) has a first end movably connected with the first piston (561) and a second end movably connected with the rotor joint ball drum (53) to drive the first piston (561) to move and change the pressure in the second regulating space (80) when the rotor joint ball drum (53) moves.

7. The universal shaft assembly of claim 5, wherein, The rotor joint seat (52) further comprises an auxiliary channel (90) in communication with the motor assembly (200), the second pressure regulating member (56) comprises: a first piston (561) movably arranged in the second regulating space (80); a driving member (563) arranged in the auxiliary channel (90), a part of the first piston (561) is located in the auxiliary channel (90), the mud in the motor assembly (200) drives the driving member (563) to rotate, and in turn drives the first piston (561) to move to change the pressure in the second regulating space (80).

8. The universal shaft assembly of claim 7, wherein, The driving member (563) comprises: an impeller (564); a bearing (565), the central shaft of the impeller (564) is connected with the bearing (565); a cam structure (566), the cam structure (566) is connected with the central shaft of the impeller (564), and the cam structure (566) rotates with the impeller (564), the cam structure (566) is in contact with the end of the first piston (561) located in the auxiliary channel (90), so that the first piston (561) is telescopic in the second regulating space (80).

9. A screw drill, characterized by The mud pump comprises a drop prevention assembly (100), a motor assembly (200), a universal shaft assembly (300) and a transmission shaft assembly (400) connected in sequence, and the universal shaft assembly (300) is the universal shaft assembly according to any one of claims 1 to 8.

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