Friction torque testing device of conductive slip ring

Abstract

The invention discloses a friction torque testing device for a conductive slip ring, and solves the problem that the conventional conductive slip ring rotation friction torque measuring method is easy to generate additional radial force and additional torque due to axis deviation, so that a large error of a measuring result is caused. The device specifically comprises a test support, a rotation driving mechanism and a moving mechanism which are arranged on the test support, a butt joint tool arranged on the action end of the rotation driving mechanism, a force measuring mechanism and a distance measuring mechanism which are arranged on the action end of the moving mechanism, and a rotation stopping tool arranged on the action end of the force measuring mechanism. The butt joint tool comprises a rotor tool and a stator tool; the rotor tool is fixed at the acting end of the rotation driving mechanism and is used for being connected with a rotor of the conductive slip ring to be tested; the stator tool is used for being connected with a stator of the conductive slip ring to be tested and is in matched connection with the rotation stopping tool; the rotation driving mechanism is used for driving the rotor tool to rotate; the force measuring mechanism is used for measuring the rotating friction force of the to-be-measured conductive slip ring; the distance measuring mechanism is used for measuring arm of force of rotating friction.

Description

Technical Field

[0001] This invention relates to torque testing devices, and more specifically to a friction torque testing device for a conductive slip ring. Background Technology

[0002] In high-end fields such as aerospace, precision instruments, and industrial automation, conductive slip rings serve as crucial electrical connectors for continuous power and signal transmission between rotating equipment and stationary structures. Their performance stability directly determines the operational reliability of the entire equipment system. This component mainly consists of a stator end (fixed end) and a rotor end (rotating end). During long-term operation of the equipment, the rotational friction torque between the stator end and the rotor end directly affects the service life, rotational accuracy, and energy consumption level of the conductive slip ring. Therefore, it has become one of the core indicators in the factory testing and R&D verification stages of conductive slip rings.

[0003] Currently, the industry primarily relies on general-purpose torque testers to test the rotational friction torque of conductive slip rings. The testing principle involves connecting a motor, torque tester, and conductive slip ring sequentially. The motor drives the rotor end of the conductive slip ring to rotate, and the torque tester reads the friction torque data. However, this traditional testing method has significant technical drawbacks: because the coaxiality of the motor output shaft, the torque tester's detection shaft, and the conductive slip ring's mounting shaft is difficult to control precisely, additional radial force and torque can easily be generated due to axial deviation during actual testing, leading to significant errors in the measurement results.

[0004] This measurement error not only fails to accurately reflect the true performance of the conductive slip ring, but in fields with stringent precision requirements such as aerospace, it can lead to substandard products entering the market and causing equipment malfunctions. It also hinders performance optimization during the research and development phase of the conductive slip ring, making it difficult to accurately determine the impact of structural improvements on frictional torque. Therefore, developing a dedicated testing device that can effectively eliminate triaxial coaxiality errors and ensure the accuracy of test results has become a pressing technical problem in the industry. Summary of the Invention

[0005] To address the technical problem in existing methods for measuring the rotational friction torque of conductive slip rings, where the coaxiality of the motor output shaft, the torque tester's detection shaft, and the conductive slip ring's mounting shaft is difficult to control precisely, leading to additional radial force and torque due to axial deviation during actual testing and resulting in significant errors in the measurement results, this invention provides a device for testing the friction torque of conductive slip rings.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A friction torque testing device for a conductive slip ring is characterized by comprising a test bracket, a rotary drive mechanism and a moving mechanism mounted on the test bracket, a docking fixture mounted on the working end of the rotary drive mechanism, a force measuring mechanism and a distance measuring mechanism mounted on the working end of the moving mechanism, and an anti-rotation fixture mounted on the working end of the force measuring mechanism. The docking fixture includes a rotor fixture and a stator fixture; the rotor fixture is fixed to the working end of the rotary drive mechanism and is used to connect with the rotor of the conductive slip ring to be tested; the stator fixture is used to connect with the stator of the conductive slip ring to be tested and is connected in conjunction with the anti-rotation fixture. The rotary drive mechanism is used to drive the rotor tooling to rotate. The force measuring mechanism is used to measure the rotational friction force of the conductive slip ring under test; The ranging mechanism is used to measure the lever arm of the rotational friction force.

[0007] Furthermore, the stator tooling includes a retaining ring and a connector rod; The retaining ring is used to fit and snap onto the stator of the conductive slip ring to be tested; One end of the plug rod is connected to the outer wall of the retaining ring, and the other end is connected to the anti-rotation fixture. The plug rod has a shoulder facing the anti-rotation fixture near the other end for limiting the movement in conjunction with the anti-rotation fixture.

[0008] Furthermore, the anti-rotation fixture includes a U-shaped base and two locking pins; The U-shaped bottom of the U-shaped base is connected to the working end of the force measuring mechanism; The two locking posts are arranged in parallel between the two parallel arms of the U-shaped base, with a gap between them for inserting the plug rod, so that the shoulder of the shaft contacts the two locking posts respectively to achieve limiting.

[0009] Furthermore, the force measuring mechanism is a push-pull force gauge; The anti-rotation fixture is installed on the lead-out rod of the push-pull force gauge.

[0010] Furthermore, the moving mechanism is a horizontal sliding table; The push-pull force gauge is mounted on the slider of the horizontal slide table, and the sliding square of the slider is perpendicular to the axis of the lead-out rod.

[0011] Furthermore, the ranging mechanism is a magnetic grating ruler; The magnetic strip of the magnetic grating ruler is fixedly connected to the horizontal base of the horizontal slide table, and its magnetic head is connected to the slider of the horizontal slide table. The zero position of the magnetic grating ruler corresponds to the reference surface; the reference surface is the surface formed by the axis of the lead-out rod of the push-pull force gauge and the axis of the rotor tooling.

[0012] Furthermore, the rotor tooling includes a docking plate and a sleeve disposed below the docking plate; The docking plate is connected to the working end of the rotary drive mechanism; The sleeve is used to fit around the rotor of the conductive slip ring to be tested.

[0013] Furthermore, the rotary drive mechanism includes a drive motor and a hollow turntable mounted on the rotation shaft of the drive motor; The drive motor is mounted on the test bracket; The rotor fixture is installed on the rotating end of the hollow turntable.

[0014] Furthermore, the docking fixture also includes a cable management tube, an adapter plate, and a fixing plate; The cable management tube is located in the cavity in the middle of the hollow turntable and is connected above the adapter plate; The adapter plate is connected to the rotating end of the hollow turntable; The fixed plate is located at the bottom of the adapter plate; The rotor tooling is detachably connected to the bottom of the fixed disk.

[0015] Furthermore, the detachable connection between the rotor tooling and the fixed disk is a screw-on connection.

[0016] The beneficial effects of this invention are: 1. The friction torque testing device for conductive slip rings provided by the present invention decomposes the measurement of friction torque of conductive slip rings into tension measurement and lever arm measurement by setting a rotation drive mechanism, a moving mechanism, a force measuring mechanism and a distance measuring mechanism. The friction torque of conductive slip rings can be accurately calculated based on the measured tension and lever arm. This method is simple and reliable, requires no shaft operation, and greatly improves the measurement accuracy.

[0017] 2. This invention provides a rotor fixture connecting the rotor of the conductive slip ring to be tested and a stator fixture connecting the stator of the conductive slip ring to be tested. An anti-rotation fixture that interlocks with the stator fixture is provided on the force measuring mechanism. When the rotation drive mechanism drives the rotor fixture to rotate, the anti-rotation fixture's obstruction of the stator fixture enables the force measuring mechanism to measure the corresponding frictional force. This structure is ingeniously designed and simple to implement, and can accurately measure the corresponding frictional force, thereby improving the accuracy of torque measurement.

[0018] 3. The present invention sets the force measuring mechanism on a horizontal slide table, and combined with a magnetic scale, it can accurately measure the corresponding lever arm, thereby improving the measurement accuracy of torque. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the friction torque testing device for a conductive slip ring according to the present invention; Figure 2This is a schematic diagram of the docking fixture in an embodiment of the present invention; Figure 3 This is a schematic diagram of the stator tooling in an embodiment of the present invention; Figure 4 This is a schematic diagram of the anti-rotation tooling in an embodiment of the present invention; Figure 5 This is a schematic diagram of the moving mechanism and the force measuring mechanism in an embodiment of the present invention; Figure 6 This is a schematic diagram of the rotor tooling in an embodiment of the present invention; Figure 7 This is an exploded structural diagram of the rotary drive mechanism in an embodiment of the present invention; Figure 8 This is a schematic diagram of the connection structure between the rotary drive mechanism and the test bracket in an embodiment of the present invention.

[0020] The attached figures are labeled as follows: 1. Test bracket; 2. Rotary drive mechanism; 21. Drive motor; 22. Hollow turntable; 3. Moving mechanism; 31. Slider; 32. Horizontal base; 4. Docking fixture; 41. Rotor fixture; 411. Docking plate; 412. Sleeve; 42. Stator fixture; 421. Snap ring; 422. Insert rod; 423. Shoulder; 43. Cable management tube; 44. Transfer plate; 45. Fixed plate; 5. Force measuring mechanism; 51. Lead-out rod; 6. Distance measuring mechanism; 61. Magnetic strip; 62. Magnetic head; 7. Anti-rotation fixture; 71. U-shaped base; 72. Snap pin; 8. Conductive slip ring to be tested. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a device for testing the frictional torque of a conductive slip ring, such as... Figure 1 As shown, the testing device includes a test bracket 1, a rotary drive mechanism 2 and a moving mechanism 3 mounted on the test bracket 1, a docking fixture 4 mounted on the working end of the rotary drive mechanism 2, a force measuring mechanism 5 and a distance measuring mechanism 6 mounted on the working end of the moving mechanism 3, and an anti-rotation fixture 7 mounted on the working end of the force measuring mechanism 5.

[0023] Test bracket 1 is mainly used for the main support structure and is usually made of rigid materials (aluminum alloy profiles) to ensure stability. It has two handles on top for moving the test device, and four feet at the bottom to prevent the test device from scraping against the platform.

[0024] The rotary drive mechanism 2 is used to drive the rotor tooling 41 to rotate; specifically, such as Figure 7 and Figure 8 As shown, the rotary drive mechanism 2 includes a drive motor 21 and a hollow turntable 22 disposed on the rotation shaft of the drive motor 21; the drive motor 21 is mounted on the test bracket 1; and the rotor tooling 41 is mounted on the rotating end of the hollow turntable 22.

[0025] The moving mechanism 3 is a horizontal slide table, which includes a horizontal base 32 and a slider 31 mounted on the horizontal base 32 in the form of a lead screw and nut.

[0026] like Figure 2 As shown, the docking fixture 4 includes a rotor fixture 41, a stator fixture 42, a cable management tube 43, a transfer plate 44, and a fixing plate 45. The cable management tube 43 is disposed in the cavity in the middle of the hollow turntable 22 and connected above the transfer plate 44, which can prevent the rotor end wires from being pulled during rotation. The transfer plate 44 is connected to the rotating end of the hollow turntable 22. The fixing plate 45 is disposed at the bottom of the transfer plate 44. Figure 6 As shown, the rotor fixture 41 includes a mating plate 411 and a sleeve 412 disposed below the mating plate 411. The mating plate 411 is connected to the bottom of the fixed plate 45 by a screw-on connection, eliminating the need for screw fixation and facilitating replacement. The sleeve 412 is used to fit over the rotor of the conductive slip ring 8 to be tested. The sleeve 412 has threaded holes on its sidewall for mounting screws to fix the sleeve 412 to the rotor of the conductive slip ring 8 to be tested. Figure 3 As shown, the stator fixture 42 includes a retaining ring 421 and a plug rod 422. The retaining ring 421 is used to fit and snap onto the outside of the stator of the conductive slip ring 8 to be tested, and is also connected to the stator by a set screw. One end of the plug rod 422 is connected to the outer wall of the retaining ring 421, and the other end is connected to the anti-rotation fixture 7. The plug rod 422 has a shoulder 423 facing the anti-rotation fixture 7 near the other end, which is used to cooperate with the anti-rotation fixture 7 for limiting the movement.

[0027] The force measuring mechanism 5 is used to measure the rotational friction force of the conductive slip ring 8 under test. In this embodiment, the force measuring mechanism 5 is a push-pull force gauge, which is set on the slider 31 of the horizontal slide table. The sliding direction of the slider 31 is perpendicular to the axial direction of the lead-out rod 51 of the push-pull force gauge.

[0028] The anti-rotation fixture 7 is installed on the lead-out rod 51 of the push-pull force gauge. For example... Figure 4As shown, the anti-rotation fixture 7 includes a U-shaped base 71 and two locking pins 72. The U-shaped bottom of the U-shaped base 71 is connected to the lead-out rod 51 of the push-pull force gauge. The two locking pins 72 are arranged parallel to each other between the two parallel arms of the U-shaped base 71, with a gap between them for inserting the connector rod 422. The shoulders 423 on the connector rod 422 contact the side walls of the two locking pins 72 respectively, thus achieving a limiting effect. The two locking pins 72 are used to prevent the stator fixture 42 from rotating.

[0029] The distance measuring mechanism 6 is used to measure the lever arm of rotational friction. In this embodiment, the distance measuring mechanism 6 is a magnetic scale; such as... Figure 5 As shown, the magnetic strip 61 of the magnetic scale is fixedly connected to the horizontal base 32 of the horizontal slide table, and its magnetic head 62 is connected to the slider 31 of the horizontal slide table; the zero position of the magnetic scale corresponds to the reference surface; the reference surface is the surface formed by the axis of the lead-out rod 51 of the push-pull force gauge and the axis of the rotor tooling 41.

[0030] In use, the rotor of the conductive slip ring 8 to be tested is inserted into the sleeve 412 of the rotor fixture 41 and fixed with set screws; the mating plate 411 is screwed onto the bottom of the fixing plate 45; then the retaining ring 421 of the stator fixture 42 is fitted onto the stator of the conductive slip ring 8 to be tested and fixed with set screws, while the insertion rod 422 is aligned with the gap between the two retaining posts 72 on the anti-rotation fixture 7; the horizontal slide is driven, and the horizontal slide moves the push-pull force gauge and the anti-rotation fixture 7 closer to the conductive slip ring 8 to be tested, and the insertion rod 422 is inserted into the gap between the two retaining posts 72 on the anti-rotation fixture 7. The gap between the two is closed until the shoulder 423 on the plug rod 422 contacts the sidewalls of the two locking posts 72. At this point, the value measured by the magnetic scale is the lever arm L. The drive motor 21 is started, which drives the hollow turntable 22 to rotate, thereby driving the rotor of the docking fixture 4 and the conductive slip ring 8 to be tested to rotate. The anti-rotation fixture 7 then prevents the plug rod 422 from rotating through the two locking posts 72, and thus prevents the stator fixture from rotating. At this point, the rotational friction of the conductive slip ring 8 to be tested is finally transmitted to the push-pull force gauge through the anti-rotation fixture, becoming a recordable specific value F. The value of the torque M is calculated according to the torque calculation formula M=F×L.

[0031] Taking a torque range of 100 mN·m to 1 N·m as a reference, the initial design uses a lever arm L = 100 mm, a magnetic scale error ΔL = 0.1 mm, a push-pull force measurement range of 10 N, and a pulling force error of 0.5% × FS. Therefore, the absolute pulling force error ΔF = 10 N × 0.5% = 50 mN. According to the error propagation formula, the absolute torque error ΔM is: △M= (1) When F=1N and L=100mm, the torque M=F×L=1N×100mm=100mN·m, and the absolute error is: △M = = ≈5mN·m (2) When F=5N and L=100mm, the torque M=F×L=5N×100mm=500mN·m, and the absolute error is: △M = = ≈5mN·m (3) When F=10N and L=100mm, the torque M=F×L=10N×100mm=1N·m, and the absolute error is: △M = = ≈5.01mN·m Therefore, within the torque range of 100mN·m to 1N·m, the absolute error is 5mN·m to 5.01mN·m, which can be written as ±1%×FS.

[0032] The friction torque testing device for conductive slip rings decomposes the friction torque of the slip ring under test into two parameters: torque and friction force, which are measured separately. Unlike traditional methods that directly measure torque using torque sensors, torque sensors require extremely high coaxiality; insufficient coaxiality accuracy will significantly affect the final test results. Furthermore, the conductive slip ring itself may have coaxiality deviations. Therefore, when using a torque sensor, it is impossible to determine whether the influence on the friction torque result comes from the coaxiality of the conductive slip ring itself or the coaxiality of the testing equipment.

[0033] When installing the friction torque testing device for conductive slip rings, only the flatness of the hollow turntable needs to be ensured.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for testing the frictional torque of a conductive slip ring, characterized in that: It includes a test bracket (1), a rotary drive mechanism (2) and a moving mechanism (3) set on the test bracket (1), a docking fixture (4) set on the working end of the rotary drive mechanism (2), a force measuring mechanism (5) and a distance measuring mechanism (6) set on the working end of the moving mechanism (3), and an anti-rotation fixture (7) set on the working end of the force measuring mechanism (5). The docking fixture (4) includes a rotor fixture (41) and a stator fixture (42); the rotor fixture (41) is fixed to the working end of the rotary drive mechanism (2) and is used to connect with the rotor of the conductive slip ring (8) to be tested; the stator fixture (42) is used to connect with the stator of the conductive slip ring (8) to be tested and is connected with the anti-rotation fixture (7). The rotary drive mechanism (2) is used to drive the rotor tooling (41) to rotate; The force measuring mechanism (5) is used to measure the rotational friction force of the conductive slip ring (8) under test; The distance measuring mechanism (6) is used as the lever arm for measuring the rotational friction force.

2. The friction torque testing device for a conductive slip ring according to claim 1, characterized in that: The stator fixture (42) includes a retaining ring (421) and a connector rod (422). The retaining ring (421) is used to fit and snap onto the stator of the conductive slip ring (8) to be tested; One end of the plug rod (422) is connected to the outer wall of the retaining ring (421), and the other end is connected to the anti-rotation fixture (7). The plug rod (422) has a shoulder (423) facing the anti-rotation fixture (7) near the other end for limiting the movement in conjunction with the anti-rotation fixture (7).

3. The friction torque testing device for a conductive slip ring according to claim 2, characterized in that: The anti-rotation fixture (7) includes a U-shaped base (71) and two locking pins (72). The U-shaped bottom of the U-shaped base (71) is connected to the working end of the force measuring mechanism (5); The two locking pins (72) are arranged in parallel between the two parallel arms of the U-shaped base (71), with a gap between them, for inserting the plug rod (422) and making the shoulder (423) contact the two locking pins (72) respectively to achieve limiting.

4. The friction torque testing device for a conductive slip ring according to claim 2 or 3, characterized in that: The force measuring mechanism (5) is a push-pull force gauge; The anti-rotation fixture (7) is installed on the lead-out rod (51) of the push-pull force gauge.

5. The friction torque testing device for a conductive slip ring according to claim 4, characterized in that: The moving mechanism (3) is a horizontal sliding table; The push-pull force gauge is installed on the slider (31) of the horizontal slide table, and the sliding square of the slider (31) is perpendicular to the axis of the lead-out rod (51).

6. The friction torque testing device for a conductive slip ring according to claim 5, characterized in that: The ranging mechanism (6) is a magnetic grating ruler; The magnetic strip (61) of the magnetic grating ruler is fixedly connected to the horizontal base (32) of the horizontal slide table, and its magnetic head (62) is connected to the slider (31) of the horizontal slide table. The zero position of the magnetic grating ruler corresponds to the reference surface; the reference surface is the surface formed by the axis of the lead-out rod (51) of the push-pull force gauge and the axis of the rotor tool (41).

7. The friction torque testing device for a conductive slip ring according to claim 6, characterized in that: The rotor tooling (41) includes a docking plate (411) and a sleeve (412) disposed below the docking plate (411). The docking plate (411) is connected to the working end of the rotary drive mechanism (2); The sleeve (412) is used to fit around the rotor of the conductive slip ring (8) to be tested.

8. The friction torque testing device for a conductive slip ring according to claim 7, characterized in that: The rotary drive mechanism (2) includes a drive motor (21) and a hollow turntable (22) mounted on the rotation shaft of the drive motor (21). The drive motor (21) is mounted on the test bracket (1); The rotor tooling (41) is installed on the rotating end of the hollow turntable (22).

9. The friction torque testing device for a conductive slip ring according to claim 8, characterized in that: The docking fixture (4) also includes a cable management tube (43), an adapter plate (44), and a fixing plate (45). The cable management tube (43) is located in the cavity in the middle of the hollow turntable (22) and is connected above the adapter plate (44); The adapter plate (44) is connected to the rotating end of the hollow turntable (22); The fixed plate (45) is located at the bottom of the adapter plate (44); The rotor tooling (41) is detachably connected to the bottom of the fixed disk (45).

10. The friction torque testing device for a conductive slip ring according to claim 7, characterized in that: The detachable connection between the rotor tooling (41) and the fixed plate (45) is a snap-lock connection.

Images