Liquid conductive slip ring with positioning function

Abstract

The utility model provides a kind of liquid conductive slip ring with positioning function, belong to conductive slip ring technical field, including shell, stator main shaft and rotor main shaft, the one end of stator main shaft projects shell and coaxially is provided with connecting shaft part, connecting shaft part is used to and corresponding mounting seat screw connection, coaxially be provided with positioning shaft part on the stator main shaft between connecting shaft part and shell, positioning shaft part is used to cooperate the radial deviation of stator main shaft with the thread fixing structure of mounting seat jointly limit, to ensure the coaxiality of liquid conductive slip ring and mounting seat;The utility model passes through the synergistic effect of positioning shaft part and thread fixing structure, effectively limit the radial deviation of stator main shaft, accurately guarantee the coaxiality of liquid conductive slip ring and mounting seat, reduce the circumferential runout in the process of slip ring rotation, reduce the damage of centrifugal force to component, to significantly improve the service life of liquid conductive slip ring.

Description

Technical Field

[0001] This utility model relates to the field of conductive slip ring technology, and in particular to a liquid conductive slip ring with positioning function. Background Technology

[0002] Liquid conductive slip rings are key components for achieving stable electrical connections between two relatively rotating mechanisms, and are widely used in automated production lines, rotary tables, precision testing instruments, wind power equipment, robot joints, and other applications. Their core working process involves establishing a conductive path between the rotating rotor shaft and the stationary stator shaft using a liquid conductive medium within a sealed cavity. This ensures continuous transmission of power or signals without entanglement, making them crucial for the efficient and continuous operation of rotating equipment.

[0003] The applicant's earlier patent, CN220138907U, discloses a corrosion-resistant liquid slip ring, which is fixed to its corresponding mounting base solely by threads. This single fixing method cannot guarantee the coaxiality of the liquid conductive slip ring and the mounting base, resulting in significant circumferential runout during slip ring rotation, and making coaxiality adjustment difficult. Under long-term operation, the slip ring is constantly subjected to additional centrifugal force, exacerbating damage to components such as bearings and seals, significantly shortening the service life of the liquid conductive slip ring, and failing to meet the long-term use requirements of high-precision equipment. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a liquid conductive slip ring with positioning function.

[0005] The technical solution adopted by this utility model is as follows: This application provides a liquid conductive slip ring with positioning function, including a housing, a stator spindle, and a rotor spindle. The rotor spindle is rotatably connected to one end of the housing through a bearing. The stator spindle is coaxially fixed to the other end of the housing. A sealing cavity is provided inside the housing. The ends of the rotor spindle and the stator spindle extend into the sealing cavity and are electrically connected through the liquid conductive medium in the sealing cavity. One end of the stator spindle extends out of the housing and is coaxially provided with a connecting shaft. The connecting shaft is used to be threadedly connected to a corresponding mounting seat. A positioning shaft is coaxially provided on the stator spindle between the connecting shaft and the housing. The positioning shaft is used to cooperate with the threaded fixing structure of the stator spindle and the mounting seat to restrict the radial displacement of the stator spindle, so as to ensure the coaxiality of the liquid conductive slip ring and the mounting seat.

[0006] In some embodiments, the positioning shaft is a cylindrical shaft with an outer diameter larger than that of the connecting shaft.

[0007] In some embodiments, a positioning disc is provided at one end of the positioning shaft facing the housing, and the positioning disc abuts against the end of the housing.

[0008] In some embodiments, the positioning disk portion is a regular polygon.

[0009] In some embodiments, the diameter of the inscribed circle of the positioning disk portion is greater than the outer diameter of the positioning shaft portion.

[0010] In some embodiments, the stator spindle further includes a fixed shaft portion, and a fixing hole is provided on the housing corresponding to the fixed shaft portion. The stator spindle is fixed to the housing by interference fit between the fixed shaft portion and the fixing hole.

[0011] In some embodiments, the connecting shaft portion, positioning shaft portion, positioning disk portion, and fixed shaft portion are all integrally formed on the stator spindle, or the connecting shaft portion, positioning shaft portion, and fixed shaft portion are all integrally formed on the stator spindle, and the positioning disk portion is threadedly connected to the stator spindle.

[0012] In some embodiments, the stator spindle further includes a transition shaft located between the connecting shaft portion and the positioning shaft portion, wherein the outer diameter of the transition shaft portion is smaller than the outer diameter of the connecting shaft portion.

[0013] In some embodiments, one end of the rotor spindle extends into the housing and is provided with a rotor insulating sleeve and a rotor shaft sleeve. One end of the stator spindle extends into the housing and is provided with a stator insulating sleeve. The rotor insulating sleeve has an inner groove and an outer groove at the end facing the stator insulating sleeve. An elastic cotton and a sealing gasket are sequentially provided in the outer groove along the direction from the bottom of the groove to the opening of the groove. The sealing cavity is formed by the stator insulating sleeve extending into the outer groove and abutting against the sealing gasket. The rotor shaft sleeve is embedded in the inner groove and fixes the rotor insulating sleeve to the rotor spindle.

[0014] In some embodiments, the end of the rotor spindle away from the sealing cavity extends outside the housing, and a dust cover is fitted around the outer periphery of this end. The end of the dust cover near the housing covers the outer side of the end of the housing and is provided with a dust cover pressure plate. A sealing groove for accommodating a sealing sheet is formed between the dust cover and the dust cover pressure plate, and the inner sidewall of the sealing sheet abuts against the outer peripheral wall of the housing.

[0015] The beneficial effects of this utility model are as follows: By setting a positioning shaft between the connecting shaft of the stator spindle and the outer shell, the positioning shaft works in conjunction with the threaded fixing structure to effectively limit the radial offset of the stator spindle, accurately ensure the coaxiality of the liquid conductive slip ring and the mounting base, reduce the circumferential runout during the rotation of the slip ring, reduce the damage of centrifugal force to the components, and thus significantly improve the service life of the liquid conductive slip ring. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a cross-sectional view of the overall structure of a liquid conductive slip ring with positioning function according to this utility model; Figure 2 This is a partial schematic diagram of a liquid conductive slip ring with positioning function according to this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the stator spindle in this utility model; Figure 4 This is a partial schematic diagram of a liquid conductive slip ring with positioning function according to this utility model. Figure 2 . Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of this application.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] The applicant's prior patent, CN220138907U, discloses a corrosion-resistant liquid slip ring. However, this liquid conductive slip ring lacks an effective positioning structure when connected to its corresponding mounting base. Relying solely on threaded fixing makes it difficult to ensure coaxiality, and it is prone to significant circumferential runout during rotation. The additional centrifugal force accelerates component damage and shortens its service life. Based on these problems, this utility model proposes a liquid conductive slip ring with a positioning function, such as... Figures 1-4 As shown: The core supporting component of the slip ring is the outer shell 1. One end of the outer shell 1 is rotatably connected to the rotor spindle 3 via a bearing 4. The bearing 4 provides stable support for the rotation of the rotor spindle 3 and reduces frictional loss during rotation. The other end of the outer shell 1 is fixedly installed with a stator spindle 2. The stator spindle 2 and the rotor spindle 3 are coaxially arranged to ensure the electrical contact accuracy between them.

[0026] The stator spindle 2 has a stepped shaft structure, with one end extending out of the outer shell 1 and coaxially provided with a connecting shaft portion 21. The outer peripheral wall of the connecting shaft portion 21 is provided with external threads for threaded connection with the corresponding mounting seat.

[0027] Importantly, a positioning shaft 22 is coaxially provided on the stator spindle 2 between the connecting shaft 21 and the housing 1. The positioning shaft 22 is a cylindrical shaft. The cylindrical shaft does not affect the threaded connection between the connecting shaft 21 and the corresponding mounting base. It is only necessary to provide a positioning hole in the mounting base that is compatible with the positioning shaft 22. The outer diameter of the positioning shaft 22 is larger than the outer diameter of the connecting shaft 21. This size design allows the positioning shaft 22 to form a stable fit with the corresponding positioning surface of the mounting base. Together with the threaded fixing structure of the connecting shaft 21, it restricts the radial offset of the stator spindle 2, fundamentally ensuring the coaxiality of the liquid conductive slip ring and the mounting base assembly, reducing the circumferential runout when the slip ring rotates, reducing the impact of centrifugal force on the components, and extending the service life of the slip ring.

[0028] Furthermore, the stator spindle 2 also includes a transition shaft portion 25 located between the connecting shaft portion 21 and the positioning shaft portion 22. The outer diameter of the transition shaft portion 25 is smaller than the outer diameter of the connecting shaft portion 21. The provision of the transition shaft portion 25 facilitates the machining and forming of the connecting shaft portion 21 and the positioning shaft portion 22.

[0029] In some embodiments, a positioning disk 23 is provided at one end of the positioning shaft portion 22 facing the housing 1. The positioning disk 23 abuts against the end of the housing 1, further enhancing the connection stability between the stator spindle 2 and the housing 1, and providing a reference for the axial positioning of the stator spindle 2.

[0030] Preferably, the positioning disk portion 23 is a regular polygon with an inscribed circle diameter larger than the outer diameter of the positioning shaft portion 22. The regular polygon structure facilitates positioning by clamping with tools during assembly, preventing the stator spindle 2 from rotating during assembly and improving assembly efficiency. The larger inscribed circle diameter ensures the contact area between the positioning disk portion 23 and the end of the outer shell 1, improving positioning reliability.

[0031] The stator spindle 2 also includes a fixed shaft part 24. The housing 1 is provided with a fixing hole 11 corresponding to the fixed shaft part 24. The stator spindle 2 is firmly fixed to the housing 1 through the interference fit between the fixed shaft part 24 and the fixing hole 11, ensuring that the stator spindle 2 does not move during the operation of the slip ring.

[0032] In some embodiments, the connecting shaft portion 21, the positioning shaft portion 22, the positioning disk portion 23, and the fixed shaft portion 24 are all integrally formed on the stator spindle 2. The integrally formed structure not only ensures the overall structural strength and dimensional accuracy of the stator spindle 2, but also reduces assembly processes, reduces assembly errors, and further improves the overall performance stability of the slip ring.

[0033] In some embodiments, the connecting shaft 21, the positioning shaft 22, and the fixing shaft 24 are all integrally formed on the stator spindle 2, and the positioning disk 23 is fixed to the stator spindle 2 by a threaded connection. In this way, the positioning disk 23 can further improve the firmness of the connection between the stator spindle 2 and the housing 1.

[0034] In some embodiments, a sealing cavity 5 is provided inside the housing 1, and the ends of the rotor main shaft 3 and the stator main shaft 2 both extend into the sealing cavity 5. The sealing cavity 5 is filled with a liquid conductive medium 6, which simultaneously contacts the ends of the rotor main shaft 3 and the stator main shaft 2 to form a stable conductive path, realize the electrical connection between the two, and ensure the continuous transmission of power or signal in the rotating state.

[0035] The rotor main shaft 3 is provided with a rotor insulating sleeve 7 and a rotor shaft sleeve 8 at one end extending into the outer casing 1, and a stator insulating sleeve 9 is provided at one end extending into the outer casing 1. The rotor insulating sleeve 7 has an inner groove 71 and an outer groove 72 at the end facing the stator insulating sleeve 9. An elastic cotton 73 and a sealing gasket 74 are arranged sequentially in the outer groove 72 from the bottom to the opening. One end of the stator insulating sleeve 9 extends into the outer groove 72 and abuts against the sealing gasket 74, thereby forming a sealing cavity 5. After the elastic cotton 73 is compressed, it applies a continuous axial preload to the sealing gasket 74, enhancing the fit and sealing of the sealing gasket 74 and the stator insulating sleeve 9, and effectively preventing the leakage of the liquid conductive medium 6 in the sealing cavity 5.

[0036] The rotor bushing 8 is embedded in the inner groove 71, which firmly fixes the rotor insulating sleeve 7 to the rotor main shaft 3, preventing the rotor insulating sleeve 7 from shifting or falling off during the rotation of the rotor main shaft 3, and ensuring the structural stability of the sealing cavity 5.

[0037] The rotor shaft 3 extends out of the outer casing 1 at one end away from the sealing cavity 5. A dust cover 10 is fitted around the outer periphery of this end. The end of the dust cover 10 closest to the outer casing 1 covers the outer side of the end of the outer casing 1, preventing external dust and impurities from entering the interior of the outer casing 1, thus avoiding contamination of the bearing 4 and the sealing cavity 5 and ensuring the normal operation of the internal components of the slip ring. A dust cover pressure plate 12 is provided on the outer side of the dust cover 10. A sealing groove for accommodating the sealing sheet 13 is formed between the dust cover 10 and the dust cover pressure plate 12. The inner sidewall of the sealing sheet 13 abuts against the outer peripheral wall of the outer casing 1, further enhancing the sealing effect between the dust cover 10 and the outer casing 1 and improving the overall dustproof and contamination-proof capability of the slip ring.

[0038] During operation, the rotor spindle 3 rotates relative to the housing 1 and the stator spindle 2 through the bearing 4 under the action of external driving force. The liquid conductive medium 6 in the sealing cavity 5 always maintains contact with the ends of the rotor spindle 3 and the stator spindle 2 to achieve stable electrical transmission. The synergistic effect of the positioning shaft part 22 and the threaded fixing structure ensures the coaxiality of the stator spindle 2 and the mounting base, greatly reducing circumferential runout and reducing the damage of centrifugal force to components such as the bearing 4 and the sealing gasket 74. The one-piece molded stator spindle 2 structure and the multi-seal design further improve the structural stability and sealing reliability of the slip ring and significantly extend the service life of the slip ring.

[0039] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0040] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0041] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A liquid conductive slip ring with positioning function, characterized in that, The device includes a housing, a stator spindle, and a rotor spindle. The rotor spindle is rotatably connected to one end of the housing via bearings. The stator spindle is coaxially fixed to the other end of the housing. A sealed cavity is provided inside the housing. The ends of both the rotor spindle and the stator spindle extend into the sealed cavity and are electrically connected through a liquid conductive medium within the sealed cavity. One end of the stator spindle extends out of the housing and is coaxially provided with a connecting shaft portion. The connecting shaft portion is used for threaded connection with a corresponding mounting seat. A positioning shaft portion is coaxially provided on the stator spindle between the connecting shaft portion and the housing. The positioning shaft portion is used to cooperate with the threaded fixing structure of the stator spindle and the mounting seat to limit the radial displacement of the stator spindle, so as to ensure the coaxiality of the liquid conductive slip ring and the mounting seat.

2. The liquid conductive slip ring with positioning function according to claim 1, characterized in that, The positioning shaft is a cylindrical shaft, and its outer diameter is larger than that of the connecting shaft.

3. A liquid conductive slip ring with positioning function according to claim 1, characterized in that, A positioning disc is provided at one end of the positioning shaft facing the outer casing, and the positioning disc abuts against the end of the outer casing.

4. A liquid conductive slip ring with positioning function according to claim 3, characterized in that, The positioning disc is a regular polygon.

5. A liquid conductive slip ring with positioning function according to claim 3, characterized in that, The diameter of the inscribed circle of the positioning disc is greater than the outer diameter of the positioning shaft.

6. A liquid conductive slip ring with positioning function according to claim 3, characterized in that, The stator spindle also includes a fixed shaft portion, and a fixing hole is provided on the housing corresponding to the fixed shaft portion. The stator spindle is fixed to the housing by interference fit between the fixed shaft portion and the fixing hole.

7. A liquid conductive slip ring with positioning function according to claim 6, characterized in that, The connecting shaft, positioning shaft, positioning disk, and fixed shaft are all integrally formed on the stator spindle, or the connecting shaft, positioning shaft, and fixed shaft are all integrally formed on the stator spindle, and the positioning disk is threadedly connected to the stator spindle.

8. A liquid conductive slip ring with positioning function according to claim 2, characterized in that, The stator spindle also includes a transition shaft located between the connecting shaft and the positioning shaft, wherein the outer diameter of the transition shaft is smaller than the outer diameter of the connecting shaft.

9. A liquid conductive slip ring with positioning function according to claim 1, characterized in that, One end of the rotor main shaft extends into the housing and is provided with a rotor insulating sleeve and a rotor shaft sleeve. One end of the stator main shaft extends into the housing and is provided with a stator insulating sleeve. The rotor insulating sleeve has an inner groove and an outer groove at the end facing the stator insulating sleeve. Elastic cotton and a sealing gasket are arranged sequentially along the direction from the bottom of the groove to the opening of the groove in the outer groove. The sealing cavity is formed by the stator insulating sleeve extending into the outer groove and abutting against the sealing gasket. The rotor shaft sleeve is embedded in the inner groove and fixes the rotor insulating sleeve to the rotor main shaft.

10. A liquid conductive slip ring with positioning function according to claim 9, characterized in that, The rotor spindle extends out of the outer casing at one end away from the sealing cavity. A dust cover is fitted around the outer periphery of this end. The end of the dust cover near the outer casing covers the outer side of the end of the outer casing and is provided with a dust cover pressure plate. A sealing groove for accommodating a sealing sheet is formed between the dust cover and the dust cover pressure plate. The inner sidewall of the sealing sheet abuts against the outer peripheral wall of the outer casing.

Images