Conductive slip ring wear life detection device

Abstract

The present invention relates to a conductive slip ring wear life detection device, which includes a servo motor, a fixed stand, and a rotating shaft. The rotating shaft is rotatably assembled in the fixed stand via a support bearing, and the servo motor is used to drive the rotating shaft. A conductive ring assembly to be tested is fixed to the rotating shaft, and the conductive ring assembly includes a conductive ring and an insulating ring. A brush holder assembly to be tested is also fixed on the upper side of the fixed stand. The brush holder assembly is in contact with the conductive ring through a contact cantilever below its circuit board, and the contact pressure between at least two conductive rings and the contact cantilever is different. Through an innovative structural design, the present invention simulates the actual installation and use conditions of the conductive slip ring, and realizes the test of the wear performance between the conductive ring and the contact cantilever. At the same time, due to the different contact pressures between the contact cantilever and the conductive ring, a comparative test of contact pressure schemes can be realized on a single test device.

Description

Technical Field

[0001] The invention belongs to the technical field of conductive slip rings, and in particular relates to a conductive slip ring wear life detection device. Background Art

[0002] Conductive slip rings are electrical connectors used to transmit power and signals between two relatively rotating mechanisms. They have a wide range of applications, including aviation, aerospace, military, wind energy, and electronic automation, and hold promising market prospects. Conductive slip ring wear testing equipment is used to measure the wear life of conductive rings and brushes, providing practical insights into the testing and evaluation of slip ring life. Currently, there are relatively few conductive slip ring life testing devices on the market, and they are unable to compare wear life under different pressures. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a conductive slip ring wear life detection device, which can realize simultaneous detection and comparison of wear life under different contact pressures.

[0004] The objectives of the present invention and the technical problems solved are achieved by adopting the following technical solutions. According to the present invention, a conductive slip ring wear life detection device comprises a servo motor, a fixed platform, and a rotating shaft. The rotating shaft is rotatably assembled in the fixed platform via a support bearing, and the servo motor is used to drive the rotating shaft. A conductive ring assembly to be detected is fixed on the rotating shaft, and the conductive ring assembly includes a conductive ring and an insulating ring. A brush holder assembly to be detected is also fixed on the upper side of the fixed platform. The brush holder assembly is in contact with the conductive ring through a contact cantilever below its circuit board, and the contact pressure between at least two conductive rings and the contact cantilever is different.

[0005] The purpose of the present invention and the solution of its technical problems can be further achieved by adopting the following technical measures

[0006] In the aforementioned conductive slip ring wear life detection device, the contact cantilever corresponding to the conductive ring has at least two opening angles.

[0007] The aforementioned conductive slip ring wear life detection device, the contact cantilever is a brush bundle, and the brush holder assembly is formed by welding the brush bundle and the circuit board through a fixing tool, and the fixing tool includes a positioning block and a pressure plate, wherein the positioning block has two positioning surfaces arranged opposite to each other, and the positioning surface is provided with an inclined groove for accommodating the brush bundle, and the positioning surface is divided into at least two sections along the distribution direction of the inclined groove according to the different inclination angles; the pressure plate is sleeved on the outer periphery of the upper end of the positioning block and has a pressing inclined surface for pressing the brush bundle in the inclined groove, and a positioning groove for realizing the positioning of the circuit board is also formed on the upper end of the pressure plate.

[0008] In the aforementioned conductive slip ring wear life detection device, the brush holder assembly adjusts the opening angle of part of the contact cantilever through the angle adjustment device, so that the contact cantilever of the brush holder assembly has at least two opening angles.

[0009] The aforementioned conductive slip ring wear life detection device, wherein the angle adjustment device includes a guide rail fixed under the circuit, and two horizontal sliders are slidingly provided on the guide rail along its length direction; the vertical slider pressed on the two horizontal sliders can move upward when the two horizontal sliders move relative to each other, and move downward when the two horizontal sliders move away from each other; the compression elastic member located between the horizontal slider and the guide rail enables the horizontal slider to push the vertical slider upward, and the adjustment screw tightened on the circuit board limits the upward movement of the vertical slider, and when the adjustment screw moves downward, the vertical slider can push the two horizontal sliders to move away from each other, so that the two horizontal sliders can push the contact cantilever to increase its opening angle.

[0010] In the above-mentioned conductive slip ring wear life detection device, there are at least two brush holder assemblies, and the distances between at least two brush holder assemblies and the conductive ring are different, so that the contact pressures between the two brush holder assemblies and the conductive ring are different.

[0011] In the aforementioned conductive slip ring wear life detection device, the brush holder assembly is fixed to the fixed platform through a brush holder adjustment device, and the brush holder adjustment device can adjust the position of the brush holder assembly in the vertical direction.

[0012] The aforementioned conductive slip ring wear life detection device, wherein the brush holder adjustment device includes two fixed grooves, the screw of the adjusting screw passes through the bottom of the fixed groove from bottom to top, and the two ends of the circuit board slide with the screw of the adjusting screw; the support spring pressed on the bottom of the fixed groove provides the power for the circuit board to move upward; the adjusting nut selected on the adjusting screw is used to press the circuit board and can provide the power for the circuit board to move downward.

[0013] In the aforementioned conductive slip ring wear life detection device, the servo motor is connected to the rotating shaft flange at the end of the rotating shaft through the servo motor flange at the end of its output shaft; the servo motor flange and the rotating shaft flange are fixed by rubber flexible pins.

[0014] The aforementioned conductive slip ring wear life detection device, the rotating shaft flange includes a flange for connecting to the servo motor flange and a tapered sleeve for adapting to the tapered cavity at the end of the rotating shaft, and the tapered sleeve is fastened to the bottom of the tapered cavity by bolts.

[0015] Compared with the prior art, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the present invention can achieve considerable technological advancement and practicality, and has wide industrial application value. It has at least the following advantages:

[0016] The present invention simulates the actual installation and use conditions of the conductive slip ring through innovative structural design, realizes the test of the wear performance between the conductive ring and the brush wire, and can adjust the contact pressure between the brush wire and the conductive ring at the same time, so that comparative tests of multiple contact pressures can be realized on one test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a conductive slip ring according to embodiment 1 of the present invention;

[0018] Figure 2 for Figure 1 sectional view of

[0019] Figure 3 This is a schematic diagram of the conductive slip ring brush pressure adjustment structure of embodiment 2 of the present invention;

[0020] Figure 4 for Figure 3 Side view of

[0021] Figure 5 for Figure 3 Schematic diagram of the pressure increase state;

[0022] Figure 6 This is a schematic diagram of the structure of the fixing fixture for the brush bundle of the conductive slip ring according to embodiment 3 of the present invention;

[0023] Figure 7 This is a schematic diagram of the brush bundle structure of Example 3 of the present invention;

[0024] Figure 8 This is a schematic diagram of the brush bundle fixing tooling used in Example 3 of the present invention;

[0025] Figure 9 This is a schematic diagram of a finished brush according to embodiment 3 of the present invention;

[0026] Figure 10 This is a schematic diagram of a brush bundle positioning block according to embodiment 3 of the present invention;

[0027] Figure 11 This is a schematic diagram of a brush bundle fixing block fixing seat according to embodiment 3 of the present invention;

[0028] Figure 12 This is a schematic diagram of a brush bundle pressure plate according to embodiment 3 of the present invention;

[0029] Figure 13 This is a schematic structural diagram of a conductive slip ring wear life testing device according to embodiment 4 of the present invention;

[0030] Figure 14 It is a structural schematic diagram of the brush holder assembly.

[0031]

Main component symbol description

[0032] 1: Rotation axis

[0033] 2: Support frame

[0034] 3: Brush holder assembly

[0035] 4: Support bearing

[0036] 5: Insulation ring

[0037] 6: Conductive ring

[0038] 7: Backstop assembly

[0039] 8: Flat key

[0040] 9: Groove

[0041] 10: Roller

[0042] 11: Preload spring

[0043] 12: Inner Star Wheel

[0044] 13: Circuit board

[0045] 14: Contact cantilever

[0046] 15: Adjusting screw

[0047] 16: Horizontal Slider

[0048] 17: Guide rail

[0049] 18: Vertical slider

[0050] 19: Press the elastic part

[0051] 20: Casing

[0052] 21: Metal Wire

[0053] 22: Positioning block

[0054] 23: Pressure plate

[0055] 24: Fixed seat

[0056] 25: Chute

[0057] 26: Servo motor

[0058] 27: Fixed stand DETAILED DESCRIPTION

[0059] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of the specific implementation, structure, characteristics and effects of the conductive slip ring proposed in accordance with the present invention in conjunction with the accompanying drawings and preferred embodiments.

[0060] 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 the fixed part to fix the conductive slip ring. The rotating shaft 1 rotates through the support bearing 4 and is installed in the inner ring of the support frame 2 and rotates with the rotating parts. The brush holder assembly 3 is fixed to the outer ring of the support frame 4. The contact cantilever 14 (brush filaments or brush bundles) extending from it slides in contact with the conductive ring 6 on the rotating shaft 1, achieving stable current transmission.

[0061] See also Figure 1 and Figure 2 , which is a schematic diagram of the various components of a conductive slip ring according to Example 1 of the present invention. In this embodiment, the conductive slip ring comprises 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 via the support bearing 4, and the brush holder assembly 3 is fixed to the outer ring of the support frame 2. Furthermore, the conductive ring 6 is fixed to the outer circumference of the rotating shaft 1 via the insulating ring 5, and both the conductive ring 6 and the insulating ring 5 are provided in multiple numbers distributed along the axial direction of the rotating shaft 1.

[0062] The brush holder assembly 3 includes a circuit board 13 and a plurality of contact cantilevers 14 fixed to the circuit board 13. The circuit board 13 is fixed to the support frame 2. The contact cantilevers 14 slide in contact with the conductive ring 6 to achieve stable current transmission. The contact cantilevers 14 are brush filaments or brush bundles capable of transmitting current. The contact between the contact cantilevers 14 and the conductive ring 6 is elastic.

[0063] In this embodiment, a check assembly 7 is provided between the rotating shaft 1 and the support frame 2 for preventing the rotating shaft from rotating in the reverse direction. The check 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 reverse direction.

[0064] In this embodiment, the check assembly 7 includes an inner planetary gear 12 that is assembled between the rotating shaft 1 and the support frame 2 and rotates synchronously with the rotating shaft 1, that is, the planetary gear 12 is located between the two concentric rings of the rotating shaft 1 and the support frame 2. A plurality of grooves 9 are formed along the circumferential direction of the outer peripheral surface of the inner planetary gear 12. A space with a gradually changing spacing along the circumferential direction is formed between the grooves 9 and the support frame 2, and the space has a large space portion that is larger than the outer diameter of the roller 10 assembled in the grooves 9 and a small space portion that is smaller than the outer diameter of the roller 10. A preload spring 11, one end of which is fixed to the side wall of the groove 9, provides the roller 10 with a force to move it from the large space portion to the small space portion, and presses the roller 10 against the support frame 2 to prevent relative rotation between the support frame 2 and the inner planetary gear.

[0065] In this embodiment, the space between the groove 9 and the support frame 2 gradually becomes smaller in the clockwise direction, so that when the rotating shaft 1 rotates clockwise, the inner star wheel 12 also rotates clockwise under the drive of the rotating shaft 1. At this time, the roller 10 compresses the preload spring 11 under the action of the support frame 2, and moves from the small space to the large space, so that the inner star wheel 12 can 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 out of the way. As a result, the roller 10 is stuck between the inner star wheel 12 and the support frame 2, and the two are locked, thereby preventing the counterclockwise rotation of the rotating shaft 1, playing a backstop role.

[0066] The support frame 2 of the present invention is provided with a flange for connecting to the stationary end. When the rotating shaft is in reverse rotation, the torque load is transferred from the support frame 2 to the stationary end through the roller. To enhance the strength of the support frame, the support frame is made of quenched bearing steel.

[0067] In this embodiment, the groove 9 is open on one side and includes only a groove bottom and a side wall. Preferably, the groove bottom and the side wall are arranged 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 planes on the side walls of two oppositely distributed grooves 9 pass through the center of the rotation axis 1.

[0068] In this embodiment, only one check assembly 7 is provided, located on the side of the support frame 2 closest to the stationary end (the side of the rotating shaft closest to the power drive end). Preferably, the check assembly 7 is located inside the support bearing, i.e., further away from the stationary end than the support bearing. However, in other embodiments, more than one check assembly 7 may be provided, located at either end of the rotating shaft 1 or distributed at both ends.

[0069] In this embodiment, the inner star wheel 12 and the rotating shaft 1 are connected via a flat key 8 to achieve synchronous circumferential rotation.

[0070] The anti-reverse assembly of this embodiment only requires processing the inner star wheel and cooperating with rollers and preload springs to prevent the rotating shaft from reversing, which is not only convenient for processing and assembly, but also does not affect the structural strength of the rotating shaft and the support frame.

[0071] The provision of the non-return assembly 7 in this embodiment enables the electric slip ring to achieve one-way non-return rotation to meet the use requirements of special working conditions.

[0072] See also Figure 3-5, which is a structural schematic diagram of the brush holder assembly 3 of the electric 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 of the opening of the contact cantilever 14 (that is, the angle between the two contact cantilever arms in contact with the same conductive ring 6) through an angle adjustment device.

[0073] In the embodiment of the present invention, there is one angle adjustment device, which can simultaneously adjust the opening angles of all contact cantilevers 14 on the brush holder assembly 3. However, in other embodiments, there are multiple angle adjustment devices, and one angle adjustment device is provided for each of the two contact cantilevers 14 in contact with the same conductive ring 6. The angles of the contact cantilevers 14 corresponding to different conductive rings 6 can be selectively adjusted to meet the contact pressure requirements between different conductive rings and the contact cantilevers 14. In addition, when some contact cantilevers are worn, they can be adjusted specifically to ensure that their contact force with the conductive rings meets the usage requirements, thereby increasing their service life.

[0074] 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 pressed against the two horizontal sliders 16, an adjustment screw 15 pressed against the vertical slider 18, and a compression elastic member 19 located between the horizontal sliders 16 and the guide rail 17 and providing elastic force for the two horizontal sliders 16 to slide relative to each other. The compression elastic member 19 is a spring made of polyurethane.

[0075] 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 cantilevers that contact the same conductive ring). The vertical slider 18 and the two horizontal sliders 16 slide together via an inclined surface, thereby converting the vertical movement of the vertical slider 18 into the horizontal movement of the horizontal sliders 16.

[0076] The adjustment screw 15 is tightened on the circuit board 13 and provides downward movement power for the vertical slider 18. When the adjustment screw 15 is fixed in a certain position, the vertical slider 18 is pressed against the horizontal slider 16 by the adjustment screw 15. At this time, the horizontal slider 16 maintains balance under the action of the vertical slider 18 and the compression elastic member 19. When the opening angle of the contact cantilever 14 needs to be increased, the vertical slider 18 is moved downward by the adjustment screw 15. At this time, the two horizontal sliders 16 compress the compression elastic member 19 and slide toward the end of the guide rail 17, so that the ends of the two horizontal sliders 16 away from the vertical slider 18 contact the contact cantilever 14 and push the contact cantilever 14 outward, increasing its opening angle.

[0077] In this embodiment, the contact cantilever 14 is a brush 141, and the circuit board 13 is evenly distributed with two rows of brushes 141 along the width direction, and a pair of brushes relatively distributed along the width direction are in contact with the same conductive ring 6, and each pair of brushes is adjusted by the same angle adjustment device to adjust the angle, thereby changing the contact pressure between the brush and the conductive ring.

[0078] In this embodiment, before adjusting the height of the adjustment screw 15, the elastic member 19 is compressed to compress the horizontal slider 16. The vertical slider 18 is pushed to the uppermost part through the force acting on the inclined surfaces of the horizontal slider 16 and the vertical slider 18. At this time, the arc structure on the side of the horizontal slider 16 does not contact the brush filaments.

[0079] During operation, the adjusting screw 15 is turned downward, and the adjusting screw 15 pushes the vertical slider 18 to move downward, and the vertical slider 18 pushes the horizontal slider 16 to move horizontally outward. The horizontal slider 16 moves in the positioning groove of the guide rail, and the arc surface of its side contacts the brush wire, pushing the brush wire to expand outward, and the brush wire opening angle increases from θ to θ1. Since the opening angle θ determines the contact pressure between the brush wire 141 and the conductive ring 6, the contact pressure between the brush wire and the conductive ring is changed, thereby realizing dynamic adjustment of the contact force.

[0080] In this embodiment, the horizontal slider 16 is generally L-shaped, with the vertical edge of the L-shaped structure forming an inclined surface for mating with the vertical slider 18. The top of the vertical surface is in a clearance fit with the lower end surface of the circuit board 13. The inclined surface extends from the top to the bottom of the vertical edge, ensuring that the vertical slider 18 has the matching inclined surface to provide support and position restraint throughout its entire sliding range. The compression spring 19 is located between the portion where the guide rail 17 connects to the circuit board 13 and the vertical edge of the horizontal slider 16.

[0081] In this embodiment, the surface of the horizontal slider 16 that contacts the brush filaments is an arc surface to prevent the brush filaments from being damaged when the brush filaments are pushed.

[0082] In other embodiments of the present invention, the contact cantilever 14 is a brush bundle 142. At this time, the horizontal slider 16 partially contacts the metal wire 21 of the brush bundle 142, and the part of the horizontal slider 16 that contacts the metal wire 21 is an arc groove that can accommodate all the metal wires 21 in the same brush bundle 142.

[0083] This embodiment adds an angle adjustment device to the brush holder assembly, which can realize convenient and quick adjustment of the angle of the brush filaments or brush bundle, thereby realizing adjustment of the pressure between the brush filaments or brush bundle and the conductive ring.

[0084] See also Figure 6-12, which is a schematic diagram of the various components of Example 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 is welded and fixed to the circuit board 13 through the sleeve 20. To ensure the positioning accuracy during welding between the brush bundle 142 and the circuit board 13, the welding of the brush bundle 142 and the circuit board 13 in this embodiment is achieved using a positioning tool 100.

[0085] In this embodiment, the positioning fixture 100 includes a positioning block 22, a pressure plate 23, and a fixing seat 24. The positioning block 22 has two opposing positioning surfaces 221 for cooperating with the brush bundle 142 for positioning. 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 an inclined groove 25 for accommodating the brush bundle 142. The inclination angle of the inclined groove 25 is consistent with the inclination angle of the positioning surface to ensure the inclination angle of the brush bundle 142. The inclined groove 25 is divided into an upper inclined groove 251 for positioning the sleeve 20 and a lower inclined groove 252 for positioning the wire 21 along its length. The upper inclined groove 251 is larger than the lower inclined groove 252, thereby forming a step 253 at the junction of the upper inclined groove 251 and the lower inclined groove 252. The lower end surface of the sleeve 20 contacts the step 253 to limit the position, achieving precise positioning of the sleeve 20 along the inclined groove direction. The pressing plate 23 is a frame-type structure, which is sleeved 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.

[0086] The upper end of the pressure plate 23 is formed with a positioning groove 232 for securing the circuit board 13. The upper end of the brush bundle 412 is positioned within a corresponding welding hole on the circuit board 13. The brush bundle sleeve 20 is welded to the circuit board 13 to complete the assembly of the brush holder assembly of the present invention. 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 comprises at least a set of walls positioned above the positioning surface of the positioning block. This arrangement of walls at least allows for axial positioning of the circuit board 13 along the rotational axis of the brush holder assembly.

[0087] In this embodiment, the pressing bevel 231 can simultaneously compress the sleeve 20 and the wire 21. Furthermore, a retaining rib 254 is provided at the bottom of the positioning block 22, corresponding to the lower end of the lower chute 252, to constrain the tail of the wire 21. This retaining rib 254 not only supports and limits the wire 21 but also constrains the tail of the wire 21, preventing it from breaking free from the lower chute 251 and affecting the fit between the pressing plate 23 and the wire 21. Preferably, the retaining rib 254 is formed by extending upward from the edge of the positioning block 22.

[0088] In order to ensure the positioning accuracy of the brush bundle, the accuracy tolerance of the positioning block 22 of the present invention is controlled within 0.02 mm.

[0089] Due to special working conditions, there may be working conditions where the brush bundles have different angles on the same mounting plate. To meet this requirement, the positioning surface 221 is divided into at least two sections along the distribution direction of the chute 25, and the inclination angle of each section is different, so that the chute 25 distributed on the positioning surface 221 has at least two different inclination angles, and thus the brush bundles positioned by the chute 25 have at least two different inclination angles. The inclination angles of each part of the pressing slope 231 on the pressing plate 23 correspond to those of each part of the positioning surface 221, so that the pressing slope 231 can press the brush bundles with different inclination angles into the corresponding chute 25, thereby achieving fixed positioning of the brush bundles.

[0090] In one embodiment of the present invention, the positioning block 22 is divided into at least two sections based on the inclination angle of the positioning surface 221. Each section has a different inclination angle, while the pressure plate 23 remains a one-piece structure. To prevent relative displacement between the different sections of the positioning block 22, the different sections are connected by bolts. Each section has a bolt hole extending along the distribution direction of the inclined slot 25 in the middle. Bolts pass through these bolt holes to secure the sections together.

[0091] In this embodiment, the positioning block 22 is divided into two parts, including a first positioning block 222 and a second positioning block 223 which are connected to each other along the distribution direction of the inclined groove 25 on the same positioning surface, wherein the inclination angles of the two positioning surfaces of the first positioning block 222 are different from the inclination angles of the two positioning surfaces of the second positioning block 223, thereby making the brush bundle positioned by the inclined groove on the first positioning block 222 and the brush bundle positioned by the inclined groove on the second positioning block 223 have different inclination angles, thereby making the brush holder assembly have brush bundles with two inclination angles to meet the needs of special working conditions.

[0092] In this embodiment, the pressure plate 23 is also formed by docking two parts along the distribution direction of the inclined groove on the same positioning surface, namely the first pressure plate 233 and the second pressure plate 234. The first pressure plate 233 and the second pressure plate 234 are both U-shaped, wherein the two relatively distributed clamping inclined surfaces of the first pressure plate 233 have an inclination angle corresponding to the two positioning surfaces on the first positioning block 222, and are used to clamp the brush bundle in the inclined groove on the two positioning surfaces of the first positioning block 222; the two relatively distributed clamping 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, and are used to clamp the brush bundle in the inclined groove on the second positioning block 223.

[0093] In this embodiment, a fixing seat 24 is further included for achieving alignment of the first positioning block 222 and the second positioning block 223. The fixing seat 24 has a pair of relatively distributed limiting protrusions 241. The limiting protrusions 221 cooperate with the partial gap below the positioning surfaces of the first limiting block 222 and the second limiting block 223 to achieve 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 being connected by bolts, so that the bolt holes cannot be aligned.

[0094] When the positioning tool 100 of this embodiment is in use, the first positioning block 222 and the second positioning block 223 are first installed on the fixed seat 24, and the inner walls of the limiting protrusions 241 on both sides of the fixed seat 24 are matched with the small gap between the side walls on the sides where the positioning surfaces of the two positioning blocks are located to achieve the alignment of the two positioning blocks, and then the two positioning blocks are fastened through the bolt holes in the middle to prevent relative movement between the two.

[0095] The brush bundle is installed into the inclined groove on the positioning surface. The first and second pressure plates are then pressed against the outer peripheries of the first and second positioning blocks, respectively. The two pressing bevels in the first pressure plate correspond to the angles of the two positioning surfaces on the first positioning block, and the two pressing bevels in the second pressure plate correspond to the angles of the two positioning surfaces on the second positioning block, thereby clamping 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. These positioning grooves cooperate with the circuit board 13 with a small clearance to achieve precise positioning of the circuit board. Finally, the circuit board and brush bundle are welded.

[0096] The positioning tool 100 of this embodiment can not only realize the precise positioning and assembly of brush bundles with the same angle on the same brush holder assembly, but also realize the precise positioning and assembly of brush bundles with different angles on the same brush holder assembly.

[0097] In order to detect the wear life of a conductive slip ring, embodiment 4 of the present invention provides a conductive slip ring wear life testing device, which can perform a wear life test on the above-mentioned conductive slip ring. The testing device includes a servo motor 26, a fixed stand 27, and a rotating shaft 1, wherein the rotating shaft 1 is rotatably assembled in the fixed stand 27 through a support bearing 4, and the servo motor 26 is used to drive 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 through the servo motor flange 261 at the end of its output shaft, wherein the servo motor flange 261 and the rotating shaft flange 101 are fixed by a rubber flexible pin 102, which acts as an elastic coupling.

[0098] The rotating shaft flange 101 and the rotating shaft 1 are positioned with 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, and the conical sleeve is fastened to the bottom of the conical cavity by bolts.

[0099] The conductive ring 6 to be tested and the insulating ring 5 are assembled to form a conductive ring assembly, which is fixed to the outer periphery of the rotating shaft 1. In this embodiment, one end of the conductive ring assembly is axially limited by cooperating with an elastic retaining spring 103 mounted on the rotating shaft 1, and the other end is axially limited by cooperating with a compression sleeve 105 and a compression nut 104 fixed to the rotating shaft 1. Specifically, the retaining spring 103 is mounted in an annular groove on the side of the rotating shaft 1 close to the servo motor 26. The outer periphery of the end of the rotating shaft 1 away from the servo motor 26 is provided with a thread for cooperating and locking with the compression nut 104. The compression sleeve 105 is compressed by the compression nut 104 against the end face of the conductive ring assembly away from the servo motor 26, thereby limiting the axial position of the conductive ring assembly.

[0100] The brush holder assembly 3 to be inspected is fixed on the upper side of the fixed stand 27 , and the brush holder assembly 3 contacts the corresponding conductive ring 3 through the contact cantilever 14 thereon, and the contact pressure between at least two conductive rings 3 and the contact cantilever 14 is different.

[0101] In this embodiment, the brush holder assembly 3 is fixed to the fixed platform 27 via a brush holder adjustment device 31. The brush holder adjustment device 31 is capable of adjusting 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 slot 311, an adjustment screw 314, an adjustment nut 312, and a support spring 313. There are two fixing slots 311, each of which has an adjustment screw 314 fixed at its bottom. The screw rod of the adjustment screw 314 extends upward into the fixing slot 311, and the adjustment nut 312 is tightened onto the screw rod. The circuit board 13 of the brush holder assembly 3 has through holes at both ends that slidably engage with the screw rod of the adjustment screw 314. The support spring 313 is sleeved on the screw rod of the adjustment screw 314 and provides power for the circuit board 13 to move upward, so that the upper end surface of the circuit board 13 is pressed against the adjustment nut 312, thereby achieving vertical positioning of the circuit board 13. When the vertical position of the brush holder assembly 3 (the contact pressure between the contact cantilever 14 and the conductive ring) needs to be adjusted, the brush holder assembly 3 can be moved vertically by adjusting the upper adjustment nut 314, 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 via a brush holder adjustment device. Therefore, the brush holder assembly 3 on the fixed platform can be adjusted to different heights as needed, so that contact cantilever wear life tests with different contact pressures can be performed on the same testing machine.

[0102] In other embodiments of the present invention, the fixed stand 27 is fixed with multiple brush holder assemblies 3 with the same cantilever opening angle, and at least two brush holder assemblies 3 are fixed at different heights on the fixed stand 27, thereby making the contact pressure between at least two brush holder assemblies 3 and the conductive slip ring different.

[0103] In another embodiment of the present 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 includes the angle adjustment device for adjusting the opening angle of the contact cantilever 14 described in Example 2. This angle adjustment device enables the contact cantilever 14 in contact with at least two of the conductive rings in the brush holder assembly 31 to have different opening angles, thereby enabling contact cantilever wear life tests with different contact pressures 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 inclination angles (opening angles), and in this embodiment, the contact cantilever is a brush bundle, and the welding fixation between the brush bundle and the circuit board is achieved by the positioning tool described in Example 3, meeting the requirements of contact cantilever wear life tests with different contact pressures on the same testing machine.

[0105] This test device simulates the actual installation and use conditions of the conductive slip ring, realizes the test of the wear performance between the conductive ring and the brush wire / brush bundle, and can adjust the contact pressure between the brush wire / brush bundle and the conductive ring. It can realize comparative testing of multiple schemes on one test device.

[0106] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A conductive slip ring wear life detection device, comprising a servo motor, a fixed stand, and a rotating shaft, characterized in that: The rotating shaft is rotatably assembled in the fixed platform through a support bearing, and the servo motor is used to drive the rotating shaft; a conductive ring assembly to be tested is fixed on the rotating shaft, and the conductive ring assembly includes a conductive ring and an insulating ring; a brush holder assembly to be tested is also fixed on the upper side of the fixed platform, and the brush holder assembly is in contact with the conductive ring through a contact cantilever under its circuit board, and the contact pressure between at least two conductive rings and the contact cantilever is different; The contact cantilever corresponding to the conductive ring has at least two opening angles, so that the detection device can simultaneously perform a synchronous comparative test on the wear between the conductive ring and the contact cantilever under different contact pressures.

2. The conductive slip ring wear life detection device according to claim 1, characterized in that: The contact cantilever is a brush bundle, and the brush holder assembly is formed by welding the brush bundle and the circuit board together through a fixing tool. The fixing tool includes a positioning block and a pressure plate, wherein the positioning block has two positioning surfaces arranged opposite to each other, and an inclined groove for accommodating the brush bundle is provided on the positioning surface. The positioning surface is divided into at least two sections along the distribution direction of the inclined groove according to different inclination angles; the pressure plate is sleeved on the outer periphery of the upper end of the positioning block and has a pressing inclined surface for pressing the brush bundle in the inclined groove. A positioning groove for realizing the positioning of the circuit board is also formed on the upper end of the pressure plate.

3. The conductive slip ring wear life detection device according to claim 1, characterized in that: The brush holder assembly adjusts the opening angles of some contact cantilevers through an angle adjustment device, so that the contact cantilevers of the brush holder assembly have at least two opening angles.

4. The conductive slip ring wear life detection device according to claim 3, characterized in that: The angle adjustment device includes a guide rail fixed under the circuit board, and two horizontal sliders are slidingly provided on the guide rail along its length direction; the vertical slider pressed on the two horizontal sliders can move upward when the two horizontal sliders move relative to each other, and move downward when the two horizontal sliders move away from each other; the compression elastic member located between the horizontal slider and the guide rail enables the horizontal slider to push the vertical slider to move upward, and the adjustment screw tightened on the circuit board limits the upward movement of the vertical slider, and when the adjustment screw moves downward, the vertical slider can push the two horizontal sliders to move away from each other, so that the two horizontal sliders can push the contact cantilever to increase its opening angle.

5. The conductive slip ring wear life detection device according to claim 1, characterized in that: There are at least two brush holder assemblies, and the distances between the at least two brush holder assemblies and the conductive ring are different, so that the contact pressures between the two brush holder assemblies and the conductive ring are different.

6. The conductive slip ring wear life detection device according to claim 5, characterized in that: The brush frame assembly is fixed to the fixed platform via a brush frame adjusting device, and the brush frame adjusting device can adjust the position of the brush frame assembly in the vertical direction.

7. The conductive slip ring wear life detection device according to claim 6, characterized in that: The brush holder adjustment device includes two fixed slots, the screw of the adjusting screw passes through the bottom of the fixed slot from bottom to top, and the two ends of the circuit board slide with the screw of the adjusting screw; the support spring pressed on the bottom of the fixed slot provides power for the circuit board to move upward; the adjusting nut screwed on the adjusting screw is used to press the circuit board and can provide power for the circuit board to move downward.

8. The conductive slip ring wear life detection device according to claim 1, characterized in that: The servo motor is connected to the rotating shaft flange at the end of the rotating shaft through the servo motor flange at the end of the output shaft; the servo motor flange and the rotating shaft flange are fixed by rubber flexible pins.

9. The conductive slip ring wear life detection device according to claim 8, characterized in that: The rotating shaft flange includes a flange for connecting with the servo motor flange and a tapered sleeve for matching with the tapered cavity at the end of the rotating shaft. The tapered sleeve is fastened to the bottom of the tapered cavity by bolts.

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