Conductive slip ring with backstop function

Abstract

The application relates to a conductive slip ring with a backstop function, which comprises a rotating shaft, a support frame and a brush holder assembly, wherein the rotating shaft is rotatably assembled in the inner ring of the support frame through a support bearing, the brush holder assembly is fixed to the outer ring of the support frame, and a backstop assembly for preventing reverse rotation of the rotating shaft is further arranged between the rotating shaft and the support frame. The conductive slip ring with the backstop function is realized by adding the backstop structure in the conventional structure of the conductive slip ring, and the end cover and the support frame are made into an integrated structure, so that the conductive slip ring with the backstop function can meet the use requirements of special working conditions.

Description

Technical Field

[0001] This invention belongs to the field of conductive slip ring technology, and specifically relates to a conductive slip ring with a backstop function. Background Technology

[0002] Conductive slip rings are electrical connection devices used for power and signal transmission between two relatively rotating mechanisms. They have a wide range of applications, including aviation, aerospace, military, wind energy, and electronic automation, and have a promising market prospect.

[0003] Conventional conductive slip rings allow the rotating shaft to rotate freely in both clockwise and counterclockwise directions, enabling the transmission of current and signals. However, for some special operating conditions, such as unidirectional revolving doors, port lifting machinery, and large fans, the rotating shaft of the conductive slip ring must be able to rotate only in one direction, with reverse rotation preventing it from turning back. Existing conductive slip rings cannot meet these requirements, therefore, in practical applications, it is often necessary to add an independent mechanical structure to work with the conductive slip ring to achieve reverse rotation prevention during use. Summary of the Invention

[0004] To solve the above problems, the present invention provides a conductive slip ring with a backstop function, which enables it to have a built-in backstop function during use without the need for other structures.

[0005] The objective of this invention and the technical problem it solves are achieved by the following technical solution. According to this invention, a conductive slip ring with a backstop function includes a rotating shaft, a support frame, and a brush holder assembly. The rotating shaft is rotatably mounted on the inner ring of the support frame via a support bearing, and the brush holder assembly is fixed on the outer ring of the support frame. A backstop assembly for preventing reverse rotation of the rotating shaft is also provided between the rotating shaft and the support frame.

[0006] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0007] The aforementioned conductive slip ring with a backstop function includes an inner star wheel assembled between the rotating shaft and the inner ring of the support frame, which prevents rotation of the rotating shaft circumferentially. Multiple grooves are formed along the outer circumferential surface of the inner star wheel. A preload spring and a roller are provided in the groove. A space that gradually decreases in a clockwise direction is formed between the groove and the support frame. This space has a large space portion larger than the outer diameter of the roller and a small space portion smaller than the outer diameter of the roller. The preload spring causes the roller to move from the large space portion to the small space portion and press it against the inner ring of the support frame.

[0008] The aforementioned conductive slip ring with backstop function has a flange on the support frame for connecting to the stationary end. When the rotating shaft is in backstop mode, the torque load is transmitted from the support frame to the stationary end through rollers.

[0009] The aforementioned conductive slip ring with the reverse stop function, the groove is open on one side, only including a groove bottom for supporting the roller and a side wall for fixing the pre-tightening spring, and the groove bottom and the side wall are distributed at 90 degrees.

[0010] The aforementioned conductive slip ring with the reverse stop function, the groove has four grooves distributed along the circumference, and the faces of the side walls of the two opposite grooves pass through the center of the rotation shaft.

[0011] The aforementioned conductive slip ring with the reverse stop function, at least on the side close to the static end between the rotation shaft and the support frame, a reverse stop assembly is arranged.

[0012] The aforementioned conductive slip ring with the reverse stop function, the rotation shaft is fixed with a plurality of conductive rings and insulating rings in the axial direction, the brush holder assembly includes a circuit board and a plurality of contact cantilevers fixed on the circuit board for contacting and conducting with the conductive rings, and the brush holder assembly further includes an adjusting device for adjusting the contact pressure between the contact cantilevers and the conductive rings.

[0013] The aforementioned conductive slip ring with the reverse stop function, the adjusting device adjusts the contact pressure by adjusting the distance between the brush holder assembly and the conductive rings or adjusting the opening angle of the contact cantilevers.

[0014] The aforementioned conductive slip ring with the reverse stop function, the rotation shaft is fixed with a plurality of conductive rings and insulating rings in the axial direction, the brush holder assembly includes a circuit board and a plurality of contact cantilevers fixed on the circuit board for contacting and conducting with the conductive rings, and the contact cantilevers are brush bundles, and the opening angles of the brush bundles corresponding to at least two conductive rings are different.

[0015] The aforementioned conductive slip ring with the reverse stop function, the positioning between the brush bundle and the circuit board is realized by a positioning tool, the positioning tool includes a positioning block and a pressing plate, the positioning block has two positioning surfaces arranged oppositely and having the same inclination angle as the brush bundle to be fixed, and the positioning surfaces are provided with inclined grooves for accommodating the brush bundle and preventing the brush bundle from sliding; the pressing plate is sleeved on the outer periphery of the upper end of the positioning block, and the inner side of the pressing plate is provided with a pressing inclined surface matched with the positioning surface to press the brush bundle in the inclined groove; and the upper end of the pressing plate is further formed with a positioning groove for realizing the positioning of the circuit board.

[0016] Compared with the prior art, the present application has obvious advantages and beneficial effects. By the above technical scheme, the present application can achieve considerable technical progress and practicality, and has wide industrial utilization value, and at least has the following advantages:

[0017] The present application increases the star wheel type reverse stop structure in the conventional structure of the conductive slip ring, integrates the end cover and the support frame, and adopts quenched bearing steel material, so as to realize the conductive slip ring with the reverse stop function, and meet the use requirements of special working conditions.

[0018] The anti-reverse component of this invention only requires machining of the inner star wheel and the use of rollers and preload springs to prevent the rotating shaft from reversing. This not only facilitates machining and assembly but also does not affect the structural strength of the rotating shaft and support frame. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the conductive slip ring in Embodiment 1 of the present invention;

[0020] Figure 2 for Figure 1 A sectional view;

[0021] Figure 3 This is a schematic diagram of the conductive slip ring brush pressure adjustment structure of Embodiment 2 of the present invention;

[0022] Figure 4 for Figure 3 Side view;

[0023] Figure 5 for Figure 3 A schematic diagram of a state of increasing pressure;

[0024] Figure 6 This is a schematic diagram of the conductive slip ring brush bundle fixing fixture structure in Embodiment 3 of the present invention;

[0025] Figure 7 This is a schematic diagram of the brush bundle structure in Embodiment 3 of the present invention;

[0026] Figure 8 This is a schematic diagram of the use of the brush bundle fixing fixture in Embodiment 3 of the present invention;

[0027] Figure 9 This is a schematic diagram of the finished brush of Embodiment 3 of the present invention;

[0028] Figure 10 This is a schematic diagram of the brush beam positioning block in Embodiment 3 of the present invention;

[0029] Figure 11 This is a schematic diagram of the brush beam fixing block fixing seat in Embodiment 3 of the present invention;

[0030] Figure 12 This is a schematic diagram of the brush beam pressure plate in Embodiment 3 of the present invention;

[0031] Figure 13 This is a schematic diagram of the conductive slip ring wear life testing device according to Embodiment 4 of the present invention; Figure 14 This is a structural diagram of the brush holder assembly.

[0032] [Explanation of Key Component Symbols]

[0033] 1: Rotation axis

[0034] 2: Support frame

[0035] 3: Brush holder components

[0036] 4: Support bearing

[0037] 5: Insulating ring

[0038] 6: Conductive ring

[0039] 7: Backstop assembly

[0040] 8: Flat key

[0041] 9: Groove

[0042] 10: Roller

[0043] 11: Preload spring

[0044] 12: Inner Star Chakra

[0045] 13: Circuit board

[0046] 14: Contact cantilever

[0047] 15: Adjusting screw

[0048] 16: Horizontal slider

[0049] 17: Guide rail

[0050] 18: Vertical slider

[0051] 19: Clamping elastic element

[0052] 20: Sleeve

[0053] 21: Metal wire

[0054] 22: Positioning Block

[0055] 23: Pressure plate

[0056] 24: Fixture

[0057] 25: Inclined groove

[0058] 26: Servo Motor

[0059] 27: Fixed stand Detailed Implementation

[0060] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation, structure, features and effects of the conductive slip ring proposed according to the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0061] The conductive slip ring is basically composed of a rotating shaft 1, an end cap, a support frame 2, a brush holder assembly 3, a support bearing 4, an insulating ring 5, and a conductive ring 6. The end cap is fixed to the end of the support frame 2 and connected to a fixing part to secure the conductive slip ring. The rotating shaft 1 rotatably passes through the inner ring of the support frame 2 via the support bearing 4 and rotates with the rotating component. The brush holder assembly 3 is fixed to the outer ring of the support frame 4 and slides in contact with the conductive ring 6 on the rotating shaft 1 through its extended contact cantilever 14 (brush filaments or brush bundle), achieving stable current transmission.

[0062] Please see Figure 1 and Figure 2 This is a schematic diagram of the various parts of the conductive slip ring according to Embodiment 1 of the present invention. In this embodiment, the conductive slip ring includes a rotating shaft 1, a support frame 2, a brush holder assembly 3, a support bearing 4, an insulating ring 5, and a conductive ring 6. The two ends of the rotating shaft 1 are rotatably connected to the inner ring of the support frame 2 through the support bearing 4, and the brush holder assembly 3 is fixed on the outer ring of the support frame 2. The conductive ring 6 is fixed to the outer circumference of the rotating shaft 1 through the insulating ring 5, and there are multiple conductive rings 6 and multiple insulating rings 5 ​​distributed along the axial direction of the rotating shaft 1.

[0063] The brush holder assembly 3 includes a circuit board 13 and a plurality of contact cantilever arms 14 fixed on the circuit board 13. The circuit board 13 is fixed on the support frame 2, and the contact cantilever arms 14 slide in contact with the conductive ring 6 to achieve stable current transmission. The contact cantilever arms 14 are brush filaments or brush bundles capable of transmitting current, and the contact between the contact cantilever arms 14 and the conductive ring 6 is an elastic contact.

[0064] In this embodiment, a backstop assembly 7 is provided between the rotating shaft 1 and the support frame 2 to prevent the rotating shaft from rotating in the opposite direction. The backstop assembly 7 allows the rotating shaft 1 to rotate in only one direction and can limit the rotation of the rotating shaft 7 when the rotating shaft 1 rotates in the opposite direction.

[0065] In this embodiment, the anti-reverse assembly 7 includes an inner planetary gear 12 mounted between the rotating shaft 1 and the support frame 2 and rotating synchronously with the rotating shaft 1. Specifically, the planetary gear 12 is located between two concentric rings of the rotating shaft 1 and the support frame 2. Multiple grooves 9 are formed along the circumferential direction of the outer surface of the inner planetary gear 12. These grooves 9 and the support frame 2 form a space with a gradually changing circumferential distance. This space has a large portion larger than the outer diameter of the roller 10 mounted within the groove 9 and a small portion smaller than the outer diameter of the roller 10. A preload spring 11, fixed at one end to the sidewall of the groove 9, provides a force to the roller 10, causing it to move from the large portion to the small portion, and presses the roller 10 against the support frame 2, preventing relative rotation between the support frame 2 and the inner planetary gear.

[0066] In this embodiment, the space between the groove 9 and the support frame 2 gradually decreases in the clockwise direction. This causes the inner star wheel 12 to rotate clockwise when the rotating shaft 1 rotates clockwise. At this time, the roller 10 compresses the preload spring 11 under the action of the support frame 2, moving from the smaller space to the larger space, allowing the inner star wheel 12 to rotate freely relative to the support frame 2. When the rotating shaft 1 drives the inner star wheel 12 to rotate counterclockwise, the roller 10 is pressed against the support frame 2 under the action of the preload spring 11. At this time, the roller 10 has no power to compress the preload spring 11 and move to make way, thus causing the roller 10 to become stuck between the inner star wheel 12 and the support frame 2, locking them together. This prevents the counterclockwise rotation of the rotating shaft 1, achieving a reverse-stopping effect.

[0067] The support frame 2 of this invention is provided with a flange for connecting to the stationary end. When the rotating shaft stops in reverse, the torque load is transmitted from the support frame 2 to the stationary end through rollers. To enhance the strength of the support frame, it is made of hardened bearing steel.

[0068] In this embodiment, one side of the groove 9 is open, comprising only the groove bottom and one side wall. Preferably, the groove bottom and the side wall are distributed at a 90-degree angle, and a vertical plane passing through the center of the rotation axis 1 passes through the side wall. Preferably, there are four grooves 9 evenly distributed along the circumference, and the side walls of two oppositely distributed grooves 9 pass through the center of the rotation axis 1.

[0069] In this embodiment, only one backstop assembly 7 is provided, located on the side of the support frame 2 near the stationary end (the rotating shaft near the power drive end). Preferably, the backstop assembly 7 is located inside the support bearing, that is, the backstop assembly 7 is farther away from the stationary end than the support bearing. However, in other embodiments, more than one backstop assembly 7 may be provided, which may be located at one end of the rotating shaft 1 or distributed at both ends of the rotating shaft.

[0070] In this embodiment, the inner star wheel 12 and the rotating shaft 1 are connected by a flat key 8 to achieve synchronous circumferential rotation.

[0071] In this embodiment, the anti-reverse component only requires machining of the inner star wheel and the use of rollers and preload springs to prevent the rotating shaft from reversing. This not only facilitates machining and assembly but also does not affect the structural strength of the rotating shaft and support frame.

[0072] The backstop component 7 in this embodiment enables the slip ring to achieve unidirectional anti-reverse rotation to meet the usage requirements of special working conditions.

[0073] Please see Figures 3-5This is a schematic diagram of the brush holder assembly 3 of the slip ring in Embodiment 2 of the present invention. In this embodiment, the brush holder assembly 3 can adjust the contact pressure between the contact cantilever 14 and the conductive ring 6 by changing the angle adjustment device of the opening angle of the contact cantilever 14.

[0074] In this embodiment of the invention, there is one angle adjustment device, which can simultaneously adjust the opening angle of all contact cantilevers 14 on the brush holder assembly 3. However, in other embodiments, there are multiple angle adjustment devices, with one angle adjustment device corresponding to each of the two contact cantilevers 14 that contact the same conductive ring 6. This allows for selective adjustment of the opening angle of contact cantilevers 14 corresponding to different conductive rings 6 to meet the contact pressure requirements between different conductive rings and contact cantilevers 14. Furthermore, when some contact cantilevers are worn, targeted adjustments can be made to ensure that the contact force between them and the conductive ring meets the usage requirements, thereby increasing their service life.

[0075] Specifically, in this embodiment, the angle adjustment device includes a guide rail 17, two horizontal sliders 16 slidably disposed on the guide rail 17 and arranged opposite to each other, a vertical slider 18 pressing on the two horizontal sliders 16, an adjusting screw 15 pressing on the vertical slider 18, and a pressing elastic member 19 located between the horizontal sliders 16 and the guide rail 17 and providing an elastic force for relative sliding of the two horizontal sliders 16. The pressing elastic member 19 is a spring made of polyurethane.

[0076] The guide rail 17 is fixed to the bottom of the circuit board 13 and extends radially along the rotation axis 1 (the distribution direction of the two contact cantilever arms that are in contact with the same conductive ring). The vertical slider 18 and the two horizontal sliders 16 are connected by a sloping sliding engagement, thereby converting the vertical movement of the vertical slider 18 into the horizontal movement of the horizontal sliders 16.

[0077] The adjusting screw 15 is tightened onto the circuit board 13 and provides downward force for the vertical slider 18. When the adjusting screw 15 is fixed in a certain position, the vertical slider 18 is pressed against the horizontal slider 16 by the adjusting screw 15. At this time, the horizontal slider 16 is balanced under the action of the vertical slider 18 and the pressing elastic element 19. When it is necessary to increase the opening angle of the contact cantilever 14, the vertical slider 18 is moved downward by adjusting the screw 15. At this time, the two horizontal sliders 16 compress the pressing elastic element 19 and slide to the end of the guide rail 17, so that the end of the two horizontal sliders 16 away from the vertical slider 18 contacts the contact cantilever 14 and pushes the contact cantilever 14 outward to increase its opening angle.

[0078] In this embodiment, the contact cantilever 14 is a brush 141. The circuit board 13 has two rows of brush 141 evenly distributed along the width direction. A pair of brush 141 that are distributed opposite each other along the width direction are in contact with the same conductive ring 6. Each pair of brush 141 is adjusted by the same angle adjustment device to change the contact pressure between the brush 141 and the conductive ring.

[0079] In this embodiment, before adjusting the height of the adjusting screw 15, the elastic element 19 is pressed to press the horizontal slider 16. Through the force between the horizontal slider 16 and the inclined surface of the vertical slider 18, the vertical slider 18 is pushed to the top. At this time, the arc structure on the side of the horizontal slider 16 does not come into contact with the brush bristles.

[0080] During operation, turning the adjusting screw 15 downwards pushes the vertical slider 18 downwards, which in turn pushes the horizontal slider 16 outwards. The horizontal slider 16 moves within the positioning groove of the guide rail, and its side arc surface contacts the brush bristles, pushing the brush bristles to expand outwards. The bristle angle increases from θ to θ1. Since the angle θ determines the contact pressure between the brush bristles 141 and the conductive ring 6, the contact pressure between the brush bristles and the conductive ring is changed, thus achieving dynamic adjustment of the contact force.

[0081] In this embodiment, the horizontal slider 16 is generally L-shaped, and the vertical side of the L-shape has a beveled surface for engaging with the vertical slider 18. The top of the vertical surface is clearance-fitted with the lower end face of the circuit board 13. The beveled surface extends from the top to the bottom of the vertical side to ensure that the vertical slider 18 has a suitable beveled surface for support and limitation throughout the entire sliding process. The clamping elastic member 19 is located between the portion where the guide rail 17 connects to the circuit board 13 and the vertical side of the horizontal slider 16.

[0082] In this embodiment, the surface of the horizontal slider 16 that contacts the brush bristles is an arc surface to prevent damage to the brush bristles when pushing them.

[0083] In other embodiments of the present invention, the contact cantilever 14 is a brush bundle 142. In this case, the horizontal slider 16 is in partial contact with the metal wire 21 of the brush bundle 142, and the part of the horizontal slider 16 in contact with the metal wire 21 is an arc groove that can accommodate all the metal wires 21 in the same brush bundle 142.

[0084] This embodiment adds an angle adjustment device to the brush holder assembly, which enables convenient and quick adjustment of the angle of the brush bristles or brush bundle, thereby adjusting the pressure between the brush bristles or brush bundle and the conductive ring.

[0085] Please see Figures 6-12This is a schematic diagram of the structure of various parts in Embodiment 3 of the present invention. In this embodiment, the contact cantilever 14 is a brush bundle 142, which includes a sleeve 20 and a metal wire 21. The upper end of the metal wire 21 is accommodated in the sleeve 20, and the sleeve 20 is used to fix it to the circuit board 13 for welding. To ensure the positioning accuracy when welding the brush bundle 142 to the circuit board 13, the welding of the brush bundle 142 and the circuit board 13 in this embodiment is achieved by a positioning fixture 100.

[0086] In this embodiment, the positioning fixture 100 includes a positioning block 22, a pressure plate 23, and a fixing base 24. The positioning block 22 has two opposing positioning surfaces 221 for positioning the brush bundle 142. The inclination angle of the two positioning surfaces is consistent with the inclination angle of the brush bundle 142 after welding. Each positioning surface 221 is provided with a slanted groove 25 for accommodating the brush bundle 142. The inclination angle of the slanted groove 25 is consistent with the inclination angle of the positioning surface to ensure the inclination angle of the brush bundle 142. The brush bundle slanted groove 25 is divided along its length into an upper slanted groove 251 for positioning the sleeve 20 and a lower slanted groove 252 for positioning the metal wire 21. The size of the upper slanted groove 251 is larger than that of the lower slanted groove 252, thereby forming a step 253 at the connection between the upper slanted groove 251 and the lower slanted groove 252. The lower end face of the sleeve 20 contacts and limits the step 253, realizing the precise positioning of the sleeve 20 along the slanted groove direction. The pressure plate 23 is a frame structure, which is fitted on the outer periphery of the upper end of the positioning block 22 and has a pressing inclined surface 231 that cooperates with the positioning surface 221 on the positioning block 22 to press the brush bundle 142 into the inclined groove 25.

[0087] The upper end of the pressure plate 23 has a positioning groove 232 for fixing the circuit board 13. At this time, the upper end of the brush bundle 412 is located in the corresponding welding hole on the circuit board 13. The assembly of the brush holder assembly of the present invention can be completed by welding the brush bundle sleeve 20 to the circuit board 13. Preferably, the bottom of the positioning groove 232 is flush with the upper surface of the positioning block 22. In this embodiment, the positioning groove 232 includes at least a set of walls located above the positioning surface of the positioning block. By modifying the walls, the circuit board 13 is positioned along the axial direction of the rotation axis that cooperates with the brush holder assembly.

[0088] In this embodiment, the clamping inclined surface 231 can simultaneously clamp the sleeve 20 and the metal wire 21. Furthermore, the bottom of the positioning block 22, corresponding to the lower end of the lower inclined groove 252, is also provided with a limiting stop 254 for constraining and limiting the tail of the metal wire 21. This limiting stop 254 not only supports and limits the metal wire 21 but also constrains the tail of the metal wire 21, preventing it from bursting off and detaching from the lower inclined groove 251, thus affecting the fit between the pressure plate 23 and the metal wire 21. Preferably, the limiting stop 254 is formed by extending upwards from the edge of the positioning block 22.

[0089] To ensure the positioning accuracy of the brush bundle, the accuracy tolerance of the positioning block 22 of this invention is controlled within 0.02mm.

[0090] Due to the special requirements of the working conditions, there may be situations where brush bundles on the same mounting plate component have different angles. To meet this requirement, the positioning surface 221 is divided into at least two segments along the distribution direction of the inclined grooves 25, and each segment has a different inclination angle. This ensures that the inclined grooves 25 distributed on the positioning surface 221 have at least two different inclination angles, thereby ensuring that the brush bundles positioned by the inclined grooves 25 have at least two different inclination angles. The inclination angles of each part of the pressing inclined surface 231 on the pressure plate 23 correspond to the respective parts of the positioning surface 221, thereby enabling the pressing inclined surface 231 to press the brush bundles with different inclination angles into the corresponding inclined grooves 25, achieving fixed positioning of the brush bundles.

[0091] In one embodiment of the present invention, the positioning block 22 is divided into at least two parts according to the difference in the inclination angle of the positioning surface 221, and the inclination angle of the positioning surface of each part is different. The pressure plate 23 is still an integral structure. To prevent relative displacement between different parts of different positioning blocks 22, the different parts of the positioning block 22 are connected by bolts. Each part is provided with a bolt hole extending along the distribution direction of the inclined groove 25 in the middle. The bolts pass through the bolt holes to connect and fix the parts together.

[0092] In this embodiment, the positioning block 22 is divided into two parts, including a first positioning block 222 and a second positioning block 223 that are connected along the distribution direction of the inclined groove 25 on the same positioning surface. The inclination angles of the two positioning surfaces of the first positioning block 222 are different from those of the two positioning surfaces of the second positioning block 223. This results in the brush bundles positioned by the inclined grooves on the first positioning block 222 and the brush bundles positioned by the inclined grooves on the second positioning block 223 having different inclination angles. This allows the brush holder assembly to have brush bundles with two inclination angles to meet the needs of special working conditions.

[0093] In this embodiment, the pressure plate 23 is also formed by two parts joined together along the distribution direction of the inclined grooves on the same positioning surface, namely the first pressure plate 233 and the second pressure plate 234. Both the first pressure plate 233 and the second pressure plate 234 are U-shaped. The two oppositely distributed pressing inclined surfaces of the first pressure plate 233 have an inclination angle that corresponds to the two positioning surfaces on the first positioning block 222, which is used to press the brush bundle in the inclined groove on the two positioning surfaces of the first positioning block 222. The two oppositely distributed pressing inclined surfaces on the second pressure plate 234 have an angle that is adapted to fit the two positioning surfaces on the second positioning block 223, which is used to press the brush bundle in the inclined groove on the second positioning block 223.

[0094] In this embodiment, a fixing seat 24 is also included for aligning the first positioning block 222 and the second positioning block 223. The fixing seat 24 has a pair of oppositely distributed limiting protrusions 241. The limiting protrusions 221 cooperate with the lower part of the positioning surface of the first limiting block 222 and the second positioning block 223 to achieve the alignment of the first positioning block 222 and the second positioning block 223. The limiting protrusions 241 can also prevent the first positioning block 222 and the second positioning block 223 from moving during the process of bolt connection, so that the bolt holes cannot be aligned.

[0095] In this embodiment, when the positioning fixture 100 is used, the first positioning block 222 and the second positioning block 223 are first installed on the fixed base 24. The inner wall of the limiting protrusion 241 on both sides of the fixed base 24 is fitted with the side wall of the two positioning blocks with a small gap to achieve the alignment of the two positioning blocks. Then, the two positioning blocks are fastened through the bolt hole in the middle to prevent relative movement between them.

[0096] The brush bundle is inserted into the inclined groove on the positioning surface. Then, the first and second pressure plates are pressed against the outer periphery of the upper ends of the first and second positioning blocks, respectively. The two pressing inclined surfaces in the first pressure plate correspond to the inclination angles of the two positioning surfaces on the first positioning block, and the two pressing inclined surfaces in the second pressure plate correspond to the inclination angles of the two positioning surfaces on the second positioning block, thus achieving the clamping of the brush bundle during welding. The limiting protrusions 241 on both sides of the first and second pressure plates form a positioning groove for positioning the circuit board. This positioning groove has a small clearance fit with the circuit board 13 to achieve precise positioning of the circuit board. Finally, the circuit board and the brush bundle are welded together.

[0097] The positioning fixture 100 in this embodiment can not only achieve precise positioning and assembly of brush bundles at the same angle on the same brush holder assembly, but also achieve precise positioning and assembly of brush bundles at different angles on the same brush holder assembly.

[0098] To test the wear life of conductive slip rings, Embodiment 4 of the present invention provides a conductive slip ring wear life testing device, which can perform wear life testing on the aforementioned conductive slip rings. The testing device includes a servo motor 26, a fixed platform 27, and a rotating shaft 1. The rotating shaft 1 is rotatably mounted within the fixed platform 27 via a support bearing 4. The servo motor 26 drives the rotating shaft 1 to rotate. In this embodiment, the servo motor 26 is connected to the rotating shaft flange 101 at the end of the rotating shaft 1 via a servo motor flange 261 at the end of its output shaft. The servo motor flange 261 and the rotating shaft flange 101 are fixed together by a rubber flexible pin 102, functioning as an elastic coupling.

[0099] The rotating shaft flange 101 and the rotating shaft 1 are positioned by a conical surface to ensure their coaxiality. That is, the rotating shaft flange 101 includes a flange connected to the servo motor flange 261 and a conical sleeve adapted to the conical cavity at the end of the rotating shaft 1. The conical sleeve is fastened to the bottom of the conical cavity by bolts.

[0100] After assembly, the conductive ring 6 and the insulating ring 5 form a conductive ring assembly, which is fixed on the outer periphery of the rotating shaft 1. In this embodiment, one end of the conductive ring assembly is axially limited by cooperating with the elastic retaining ring 103 mounted on the rotating shaft 1, and the other end is axially limited by cooperating with the clamping sleeve 105 and the clamping nut 104 fixed on the rotating shaft 1. Specifically, the retaining ring 103 is mounted in the annular groove on the side of the rotating shaft 1 closest to the servo motor 26. The outer periphery of the rotating shaft 1 away from the servo motor 26 is provided with threads for locking with the clamping nut 104. The clamping sleeve 105 is pressed by the clamping nut 104 onto the end face of the conductive ring assembly away from the servo motor 26, thereby achieving axial limitation of the conductive ring assembly.

[0101] The brush holder assembly 3 to be tested is fixed on the upper side of the fixed platform 27, and the brush holder assembly 3 contacts the corresponding conductive ring 3 through the contact cantilever 14 on it, and the contact pressure between at least two conductive rings 3 and the contact cantilever 14 is different.

[0102] In this embodiment, the brush holder assembly 3 is fixed to the fixed frame 27 by a brush holder adjustment device 31, which can adjust the vertical position of the brush holder assembly 3 to change the contact pressure between the contact cantilever 14 and the conductive ring 6. In this embodiment, the brush holder adjustment device 31 includes a brush holder fixing groove 311, an adjusting screw 314, an adjusting nut 312, and a support spring 313. There are two fixing grooves 311, and an adjusting screw 314 is fixed to the bottom of each fixing groove 311. The screw of the adjusting screw 314 extends upward into the fixing groove 311, and the adjusting nut 312 is screwed onto the screw. The circuit board 13 of the brush holder assembly 3 has through holes at both ends that slide with the screw of the adjusting screw 314. The support spring 313 is sleeved on the screw of the adjusting screw 314 and provides upward movement force for the circuit board 13, so that the upper surface of the circuit board 13 is pressed against the adjusting nut 312, thereby achieving vertical positioning of the circuit board 13. When it is necessary to adjust the vertical position of the brush holder assembly 3 (the contact pressure between the contact cantilever 14 and the conductive ring), only the upper adjusting nut 314 needs to be adjusted to move the brush holder assembly 3 vertically, thereby adjusting the contact pressure between the contact cantilever 14 and the conductive ring 6. In this embodiment, there are at least two brush holder assemblies 3, each of which is fixed to the fixed platform 27 by a brush holder adjustment device. Thus, the brush holder assembly 3 on the fixed platform can be adjusted to different heights as needed, thereby enabling contact cantilever wear life tests with different contact pressures to be performed on the same testing machine.

[0103] In another embodiment of the invention, the circuit board 13 of the brush holder assembly 31 is directly fixed to the upper side of the fixed platform, and the brush holder assembly 31 has the angle adjustment device for adjusting the opening angle of the contact cantilever 14 as described in Embodiment 2. This angle adjustment device allows the opening angles of at least two of the contact cantilever 14s in the brush holder assembly 31 that are in contact with the conductive rings to be different. This enables contact cantilever wear life tests with different contact pressures to be performed on the same testing machine.

[0104] In another embodiment of the present invention, the contact cantilever in the same brush holder assembly 31 has at least two different tilt angles (opening angles), and in this embodiment, the contact cantilever is a brush bundle, and the welding and fixing between the brush bundle and the circuit board is achieved by the positioning fixture described in embodiment 3, so as to meet the requirement of achieving contact cantilever wear life test with different contact pressures on the same testing machine.

[0105] This testing device simulates the actual installation and use conditions of conductive slip rings, realizing the testing of wear performance between conductive slip rings and brush filaments / brush bundles. At the same time, the contact pressure between brush filaments / brush bundles and conductive slip rings can be adjusted, and multiple schemes can be compared and tested on a single testing device.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A conductive slip ring with a backstop function, comprising a rotating shaft, a support frame, and a brush holder assembly, wherein the rotating shaft is rotatably mounted on the inner ring of the support frame, and the brush holder assembly is fixed on the outer ring of the support frame, characterized in that: A backstop assembly is provided between the rotating shaft and the support frame to prevent the rotating shaft from rotating in the opposite direction. Several conductive rings and insulating rings are fixed axially on the rotating shaft. The brush holder assembly includes a circuit board and several contact cantilever arms fixed on the circuit board for contacting and communicating with the conductive rings. The brush holder assembly also includes an adjustment device for adjusting the contact pressure between the contact cantilever arms and the conductive rings. The adjustment device adjusts the contact pressure by adjusting the opening angle of the contact cantilever arms. The adjustment device includes a guide rail fixed below the circuit board, on which two horizontal sliders are slidably arranged along its length. A vertical slider pressed against the two horizontal sliders can move upwards when the two horizontal sliders move relative to each other and downwards when the two horizontal sliders move in opposite directions. A clamping elastic element located between the horizontal sliders and the guide rail causes the horizontal sliders to push the vertical sliders upwards. An adjusting screw tightened on the circuit board limits the upward movement of the vertical slider. When the adjusting screw moves downwards, the vertical slider can push the two horizontal sliders to move in opposite directions, allowing the two horizontal sliders to push the contact cantilever arms, increasing their opening angle.

2. The conductive slip ring with backstop function according to claim 1, characterized in that: The backstop assembly includes an inner star wheel mounted between the rotating shaft and the inner ring of the support frame, which prevents rotation of the rotating shaft circumferentially. Multiple grooves are formed along the outer circumferential surface of the inner star wheel. A preload spring and a roller are provided in the groove. A space that gradually decreases in a clockwise direction is formed between the groove and the support frame. This space has a large space portion larger than the outer diameter of the roller and a small space portion smaller than the outer diameter of the roller. The preload spring causes the roller to move from the large space portion to the small space portion and press it against the inner ring of the support frame.

3. The conductive slip ring with backstop function according to claim 2, characterized in that: The support frame is equipped with a flange for connecting to the stationary end. When the rotating shaft stops in reverse, the torque load is transmitted from the support frame to the stationary end through rollers.

4. The conductive slip ring with backstop function according to claim 2, characterized in that: The groove is open on one side and includes only a groove bottom for supporting the roller and a side wall for fixing the preload spring, with the groove bottom and the side wall being distributed at a 90-degree angle.

5. The conductive slip ring with backstop function according to claim 4, characterized in that: The groove has four grooves evenly distributed along the circumference, and the surfaces containing the sidewalls of two oppositely distributed grooves pass through the center of the rotation axis.

6. The conductive slip ring with backstop function according to claim 1, characterized in that: A backstop assembly is provided between the rotating shaft and the support frame, at least on the side closer to the stationary end.

Images