Coating method of grease for spatial hundred million conversion slip ring
By soaking the insulating layer in base oil and controlling the amount of grease using a micro-injector, combined with post-coating running-in testing, the wear and electrical contact performance issues of the space slip ring were resolved. This achieved uniform grease distribution and stable electrical contact performance, thus improving the slip ring's lifespan to the hundreds of millions of revolutions.
Patent Information
- Application Number
- CN202511194198.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2025-11-11
AI Technical Summary
In existing technologies, space slip rings suffer severe wear and produce a lot of debris in a vacuum environment, resulting in poor power supply and distribution safety. Furthermore, uneven grease coating and difficulty in controlling electrical contact performance make it difficult to meet the requirements of long life and high reliability at the level of hundreds of millions of revolutions.
The insulation layer is immersed in base oil at room temperature and pressure. The amount of grease is controlled by a micro-syringe. After coating, a running-in test is performed to ensure the uniformity of the grease. This includes pre-coating inspection, resistance measurement before, during and after running-in, and removal of excess grease to ensure uniform grease distribution and stable electrical contact performance.
It achieves uniform distribution of grease in the space slip ring, reduces wear of the friction pair, improves the stability of electrical contact performance and the long service life of the slip ring at hundreds of millions of revolutions, and is applicable to other similar space slip ring products.
Smart Images
Figure HDA0005564619060000011
Abstract
Description
Technical Field
[0001] This invention belongs to the field of space electrical transmission technology, specifically relating to a method for coating grease for space-grade high-speed slip rings. Background Technology
[0002] In harsh environments such as vacuum, conventional slip ring technology suffers from severe wear and excessive debris, affecting power supply and distribution safety and failing to meet the requirements of long lifespan and high reliability with stable performance after hundreds of revolutions. Reducing wear of the friction pair through lubrication is one way to achieve the required lifespan of slip rings after hundreds of revolutions. Appropriate conductive grease and coating testing methods can reduce the coefficient of friction and contact resistance, and improve current carrying stability. However, existing technologies suffer from uneven grease coating and difficulty in controlling electrical contact performance.
[0003] To address the problems of existing technologies and the application requirements of conductive greases, there is an urgent need to propose a grease coating method for space slip rings with a lifespan of hundreds of millions of revolutions. This method should clearly define the grease coating process, quantitative control requirements, and running-in testing, thereby reducing wear and debris on the friction pair, achieving a long lifespan function with a lifespan of hundreds of millions of revolutions, and be applicable to other similar space slip ring products. Summary of the Invention
[0004] In view of the shortcomings and deficiencies of the existing technology, and in order to solve the problems of uneven grease coating and difficulty in controlling electrical contact performance, the purpose of this invention is to provide a grease coating method for space-grade slip rings with hundreds of millions of revolutions per minute.
[0005] The specific technical solution of the present invention is as follows:
[0006] A method for applying grease to a space-grade slip ring capable of handling hundreds of millions of revolutions includes the following steps:
[0007] S1. Insulation layer oiling: The surface roughness of the insulation layer is controlled by immersing the insulation layer in base oil.
[0008] S2, Grease loading;
[0009] S3. Oil coating during sample introduction: Volumetric quantification is used to control the amount of oil on the surface.
[0010] S4. Inspect after coating;
[0011] S5. Post-coating run-in: Multiple run-ins are performed to ensure that the injected grease evenly covers the slip ring track;
[0012] S6. Remove excess grease from the sample;
[0013] S7. Remove excess sample grease and reposition the sample before inspection.
[0014] Furthermore, the base oil impregnation of the insulation layer described in step S1 is carried out at normal temperature and pressure to achieve the oil storage function on the surface of the insulation layer, avoid subsequent grease creep loss, affect lubrication characteristics, and shorten product service life.
[0015] Furthermore, the specific operation method for loading the grease in step S2 is as follows: after stirring the grease until it is uniform, without sedimentation or layering, it forms the injection grease, and the injection grease is transferred to the micro-injector.
[0016] Furthermore, the volume quantification control mentioned in step S3 is to use a micro-syringe to control the amount of the injected grease, and to uniformly coat the grease onto the surface of the slip ring channel ring ring ring by ring ring to form an oiled slip ring.
[0017] Furthermore, the specific operation method for the post-coating inspection in step S4 is as follows: use magnified observation to check whether the grease coating of the oil-coated slip ring is uniform; and measure the static contact resistance of each ring of the oil-coated slip ring and the dynamic contact resistance of the two rings connected in series to determine the uniformity of the grease coating.
[0018] Furthermore, the specific operation method of the multiple running-in in step S5 is as follows: run the oiled slip ring at room temperature and pressure at the rated speed for more than 1 hour, test the static contact resistance of each ring of the oiled slip ring during the running-in process and after the running-in, and the dynamic contact resistance of the two rings connected in series to determine the uniformity of the injected oil.
[0019] Furthermore, the specific operation method for removing excess injection grease in step S6 is as follows: remove excess injection grease generated in step S5 in a timely manner to avoid secondary contamination of the run-in track.
[0020] Furthermore, the specific operation method for the post-reset inspection in step S7 is as follows: after resetting the run-in oiled slip ring, use magnified observation to check whether the grease coating of the slip ring channel is uniform; and measure the static contact resistance of each ring of the run-in oiled slip ring and the dynamic contact resistance of the two rings connected in series to determine the uniformity of the grease coating.
[0021] Furthermore, the criteria for judging the uniformity of the oil coating must simultaneously meet two conditions: First, 8 points are uniformly selected from each of the oil-coated slip rings, and the static contact resistance of the 8 points is measured and recorded as the uniform 8-point static contact resistance. The fluctuation value of the uniform 8-point static contact resistance is less than or equal to 5mΩ; Second, the fluctuation value of the dynamic contact resistance of the two rings connected in series is less than or equal to 5mΩ.
[0022] Furthermore, the grease is a P201 series vacuum conductive grease.
[0023] Compared with the prior art, the beneficial effects achieved by this invention are as follows:
[0024] 1. This invention uses a method of soaking the insulating layer in base oil at room temperature and pressure to achieve the oil storage function on the surface of the insulating layer, thereby avoiding the loss of grease creep on the working surface of the friction pair in the later stage, which would affect the long-life lubrication characteristics of the product.
[0025] 2. The grease coating step adopted in this invention achieves uniform grease distribution, solves the problem of uneven vacuum grease coating in space slip rings, and realizes the engineering application of vacuum conductive grease in conductive slip rings.
[0026] 3. The present invention adopts a running-in step after coating, and tests the performance before, during and after running-in after the grease is applied, which solves the problem of difficult control of electrical contact performance. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a method for coating a grease for a space-grade slip ring with a rotation speed of hundreds of millions of revolutions, provided by the present invention.
[0029] Specific implementation methods
[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention.
[0031] The flowchart of the grease coating implementation of the present invention is as follows: Figure 1 As shown.
[0032] This invention proposes a method for applying grease to space-grade slip rings capable of hundreds of millions of revolutions, comprising the following steps:
[0033] S1. Insulation layer oiling: The surface roughness of the insulation layer is controlled by immersing the insulation layer in base oil.
[0034] S2. Vacuum conductive grease is loaded;
[0035] S3. Vacuum conductive grease coating: Volumetric quantification is used to control the surface amount of vacuum conductive grease.
[0036] S4. Inspect after coating;
[0037] S5. Post-coating run-in: Multiple run-ins are performed to ensure that the vacuum conductive grease for sample injection is evenly covered in the slip ring track.
[0038] S6. Remove excess conductive grease from the vacuum sample injection system;
[0039] S7. Remove excess vacuum conductive grease from the sample injection system and check after resetting.
[0040] In step S1, the base oil immersion of the insulation layer is carried out at normal temperature and pressure to achieve the oil storage function on the surface of the insulation layer, avoid subsequent grease creep loss, affect lubrication characteristics, and shorten product service life.
[0041] In step S2, the specific operation method for loading the oil is as follows: after stirring the oil until it is uniform, without sedimentation or layering, it forms the injection oil, and the injection oil is transferred to the micro-injector.
[0042] In step S3, the volume quantification control is achieved by using a micro-injector to control the amount of injected grease, uniformly coating the grease ring by ring onto the surface of the slip ring channel to form an oiled slip ring.
[0043] In step S4, the specific operation method for the post-coating inspection is as follows: the uniformity of the sample grease coating in the oil-coated slip ring channel is checked by magnified observation; and the static contact resistance of each ring of the oil-coated slip ring and the dynamic contact resistance of the two rings connected in series are measured to determine the uniformity of the sample grease coating.
[0044] In step S5, the specific operation method of the multiple running-in is as follows: the oiled slip ring is run-in at room temperature and pressure at the rated speed for more than 1 hour, and the static contact resistance of each ring of the oiled slip ring and the dynamic contact resistance of the two rings in series are tested during and after the running-in process to determine the uniformity of the injected oil.
[0045] In step S6, the specific operation method for removing excess injection grease is as follows: remove the excess injection grease generated in step S5 in a timely manner to avoid secondary contamination of the run-in track.
[0046] In step S7, the specific operation method of the post-reset inspection is as follows: after resetting the run-in oiled slip ring, use magnified observation to check whether the grease coating of the slip ring channel is uniform; and measure the static contact resistance of each ring of the run-in oiled slip ring and the dynamic contact resistance of the two rings in series to determine the uniformity of the grease coating.
[0047] Furthermore, the criteria for judging the uniformity of the vacuum conductive grease coating must simultaneously meet two conditions: First, 8 points are uniformly selected from each of the grease-coated slip rings, and the static contact resistance of the 8 points is measured and recorded as the uniform 8-point static contact resistance. The fluctuation value of the uniform 8-point static contact resistance is less than or equal to 5mΩ; Second, the fluctuation value of the dynamic contact resistance of the two rings connected in series is less than or equal to 5mΩ.
[0048] The vacuum conductive grease is preferably a P201 series vacuum conductive grease.
[0049] The following are the specific steps of a grease coating method for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions provided in this embodiment:
[0050] S1. Weigh a single insulation layer and immerse it in base oil for at least 5 minutes. Remove the oil-immersed insulation layer with tweezers. Hang it vertically on a clean rod and let it stand for at least 4 hours. Wipe off the excess base oil with lint-free oil-absorbing paper. Measure and record the weight after oil absorption. Finally, store the insulation layer in a clean environment for later use.
[0051] S2. Stir the vacuum conductive grease with a stirring rod for 1-3 minutes until it is uniform. Visually inspect the vacuum conductive grease for any sedimentation or stratification, and form the injection grease. Use a disposable syringe to draw in an appropriate amount of empty conductive grease and transfer the empty conductive grease to a mL-marked microsyringe. During the process, internal gas or air bubbles need to be expelled.
[0052] S3. Align the plastic needle of the microsyringe with the ring channel and bring it close to the channel; rotate the product at a constant speed of less than 3 rpm, and slowly operate the push handle of the microsyringe during rotation to distribute the vacuum conductive grease more evenly on the surface of the copper ring. After each ring is coated, record the scale of the microsyringe to ensure that the amount of vacuum conductive grease injected into each ring meets the requirements.
[0053] S4. Use a magnifying glass to check whether the vacuum conductive grease coating of the ring is uniform; measure the static contact resistance at 8 points on each ring, and the static contact resistance fluctuation value must be less than or equal to 5mΩ; the dynamic contact resistance fluctuation value of the two rings connected in series must be less than or equal to 5mΩ.
[0054] S5. The space slip ring is run at rated speed for more than 1 hour under normal temperature and pressure, and the static contact resistance and dynamic contact resistance are tested before, during and after the run-in.
[0055] S6. Disassemble the brush holder from the product and fix it to the brush holder fixture. Use a toothpick to remove excess sample vacuum conductive grease from the outside of the brush bristles, and gently wipe the excess sample vacuum conductive grease from the outside of the brush bristles with lint-free blotting paper to ensure that there is no clump of excess sample vacuum conductive grease at the brush bristle bundle. Reinstall the brush holder onto the main body. When the brush bristles are close to the rotor spacer ring, there is still a distance between the brush holder and the actual installation position. Use the viewing window of this distance to check whether the brush bristles are inserted into the corresponding ring position. After the brush bristles are in the correct position, install the entire brush holder down to the preset assembly position.
[0056] S7. Use a magnifying glass to check whether the grease coating of the ring injection channel is uniform; measure the static contact resistance at 8 points on each ring, and the static contact resistance fluctuation value must be less than or equal to 5mΩ; the dynamic contact resistance fluctuation value of the two rings connected in series must be less than or equal to 5mΩ.
[0057] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, 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 invention, are all within the protection scope of the present invention. Content not described in detail in this specification is common knowledge to those skilled in the art.
Claims
1. A method for coating a grease for a space-grade slip ring capable of hundreds of millions of revolutions, characterized in that, Includes the following steps: S1. Insulation layer oiling: The surface roughness of the insulation layer is controlled by immersing the insulation layer in base oil. S2, Grease loading; S3. Oil coating during sample introduction: Volumetric quantification is used to control the amount of oil on the surface. S4. Inspect after coating; S5. Post-coating run-in: Multiple run-ins are performed to ensure that the injected grease evenly covers the slip ring track; S6. Remove excess grease from the sample; S7. Remove excess sample grease and reposition the sample before inspection.
2. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: In step S1, the base oil impregnation of the insulating layer is carried out at normal temperature and pressure to achieve the oil storage function on the surface of the insulating layer.
3. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: The specific operation method for loading the oil in step S2 is as follows: after stirring the oil until it is uniform, without sedimentation or layering, it forms the injection oil, and the injection oil is transferred to the micro-injector.
4. The method for coating a grease for a space-grade, high-revolution slip ring according to claim 1, characterized in that: The volume quantification control mentioned in step S3 is to use a micro-syringe to control the amount of the injected grease, and to uniformly coat the grease onto the surface of the slip ring channel ring ring by ring to form an oiled slip ring.
5. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: The specific operation method for the post-coating inspection in step S4 is as follows: use magnified observation to check whether the grease coating of the oil-coated slip ring is uniform; and measure the static contact resistance of each ring of the oil-coated slip ring and the dynamic contact resistance of the two rings connected in series to determine the uniformity of the grease coating.
6. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: The specific operation method of the multiple running-in in step S5 is as follows: run the oiled slip ring at room temperature and pressure at the rated speed for more than 1 hour, test the static contact resistance of each ring of the oiled slip ring during the running-in process and after the running-in process, and the dynamic contact resistance of the two rings connected in series to determine the uniformity of the injected oil.
7. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: In step S6, the specific operation method for removing excess injection grease is as follows: remove the excess injection grease generated in step S5 in a timely manner to avoid secondary contamination of the run-in track.
8. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: The specific operation method for the post-reset inspection in step S7 is as follows: after resetting the run-in oiled slip ring, use magnified observation to check whether the grease coating of the slip ring channel is uniform; and measure the static contact resistance of each ring of the run-in oiled slip ring and the dynamic contact resistance of the two rings in series to determine the uniformity of the grease coating.
9. A method for coating a grease for a space-grade, multi-million-revolution slip ring according to claim 5 or 8, characterized in that: The criteria for judging the uniformity of the injected grease coating must simultaneously meet two conditions: First, 8 points are uniformly taken from each of the grease-coated slip rings, and the static contact resistance of the 8 points is measured and recorded as the uniform 8-point static contact resistance. The fluctuation value of the uniform 8-point static contact resistance is less than or equal to 5mΩ. Second, the fluctuation value of the dynamic contact resistance of the two-ring series connection is less than or equal to 5mΩ.
10. The method for coating a grease for a space-grade slip ring with a rotational speed of hundreds of millions of revolutions according to claim 1, characterized in that: The grease is a P201 series vacuum conductive grease.