Multi-ring-number miniature long-life inertial platform slip ring conductive device

Abstract

The invention discloses a multi-ring-number miniature long-life inertial platform slip ring conductive device, which comprises a conductive rod assembly, two groups of brush carrier assemblies, a bracket, a first bearing, a second bearing and an outer cover, the two ends of the conducting rod assembly are installed in the support through the first bearing and the second bearing respectively. The two groups of brush carrier assemblies are symmetrically mounted on the outer side of the bracket; the outer cover is installed on the outer side of the brush holder assembly and used for protecting the internal structure. The multi-ring-number miniature long-service-life slip ring conductive device for the inertial platform can meet the requirements of multiple paths, small size, long-term reliable work under severe environment conditions and the like at the same time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of inertial platform design, and particularly relates to a multi-ring micro long-life inertial platform slip ring conductive device. BACKGROUND

[0002] The inertial platform is usually compact in structure and small in internal space. During work, continuous relative rotation is required between frames, and multiple independent electrical signals are transmitted without interruption during rotation. Moreover, the working environment is relatively harsh. The slip ring conductive device is installed at the shaft end of the inertial platform, and the wires connected to the rotating part are divided into two sections with a following rotation function in the middle to solve the wire twisting problem. The slip ring conductive device bears the transmission of all electrical signals of the relative rotating part. Once a failure occurs, the inertial platform will not work normally. Therefore, the requirements for the slip ring conductive device are as follows: about 30 channels, small size, reliable power transmission, capable of bearing more than 20g overload, more than 1000g impact, and vibration of more than rms 6g; under the conditions of vibration, impact, overload, and rotation, the resistance change of each independent channel is not more than 0.04Ω; the maximum current that can pass through each ring is not less than 2.8A; the insulation resistance between each independent channel is not less than 250MΩ under the condition of 250V; it can work normally in the temperature range of-10℃ to 65℃; it works in air medium; the service life is more than 15 years; and the rotation life is more than 100 million times. The existing products cannot simultaneously meet the comprehensive conditions of channel number, size, resistance to harsh environment, and long service life. SUMMARY

[0003] The technical problem of the present application is to overcome the shortcomings of the prior art and provide a multi-ring micro long-life inertial platform slip ring conductive device that can simultaneously meet the requirements of multiple channels, small size, and long-term reliable work in harsh environmental conditions.

[0004] To solve the above technical problems, the present application discloses a multi-ring micro long-life inertial platform slip ring conductive device, which comprises a conductive rod assembly, two sets of brush holder assemblies, a support, a first bearing, a second bearing, and an outer cover. The two ends of the conductive rod assembly are respectively installed in the support through the first bearing and the second bearing. The two sets of brush holder assemblies are symmetrically installed on the outer side of the support. The outer cover is installed on the outer side of the brush holder assembly to protect the internal structure.

[0005] In the above multi-ring micro long-life inertial platform slip ring conductive device, the conductive rod assembly comprises a support frame and 2N slip rings. The 2N slip rings are arranged at intervals and installed on the support frame. The pouring sealant is poured between the adjacent two slip rings. 10≤N≤15.

[0006] In the above-mentioned multi-ring micro long-life inertial platform slip ring conductive device, each brush holder assembly includes: N brushes and brush holder; wherein, one end of each brush is fixed on the brush holder, and the other end is attached to the corresponding slip ring.

[0007] In the aforementioned multi-ring micro long-life inertial platform slip ring conductive device, the distance between two adjacent brushes in each brush holder assembly is twice the distance between two adjacent slip rings.

[0008] In the aforementioned multi-ring micro long-life inertial platform slip ring conductive device, the spacing between two adjacent slip rings is 0.75 mm.

[0009] In the aforementioned multi-ring micro long-life inertial platform slip ring conductive device, each slip ring is welded with a lead wire.

[0010] In the aforementioned multi-ring micro long-life inertial platform slip ring conductive device, the slip ring surface is electroplated with a hard gold plating layer, and the rotational life is greater than 1 million revolutions.

[0011] In the aforementioned multi-ring micro long-life inertial platform slip ring conductive device, each brush is welded with a lead wire.

[0012] The present invention has the following advantages: This invention discloses a multi-ring micro long-life inertial platform slip ring conductive device, which can provide 20 to 30 relatively independent channels, meeting the requirements of inertial platforms for the number of conductive channels. Furthermore, through the structural design of the support, brush holder, slip ring, and brush, the overall structure is precise and compact, with a length of 27 to 34.5 mm and a diameter of 18 mm, which can meet the space-constrained requirements of inertial platforms. Furthermore, it can ensure reliable contact between the brush and the slip ring under harsh environmental conditions, as well as reliable insulation between each independent channel, exhibiting strong environmental adaptability and meeting the requirements of reliable operation of inertial platforms under harsh environmental conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a multi-ring micro long-life inertial platform slip ring conductive device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a conductive rod assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a brush holder assembly in an embodiment of the present invention. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0015] The core design concept of this invention is as follows: 1) To arrange a sufficient number of slip rings and insulating layers within a limited space, precise structural design calculations are required for the conductive rod assembly, and corresponding closed-loop dimension chain calculations are performed in conjunction with the brush arrangement: Considering the structural space, the thickness of the slip rings should be minimized while ensuring sufficient energizing capacity and structural strength, and the thickness of the insulating layer should be minimized while ensuring sufficient insulation strength and structural connection strength. 2) To arrange a sufficient number of brushes and insulating layers within a limited space, precise structural design calculations are required for the brush holder assembly, and corresponding closed-loop dimension chain calculations are performed in conjunction with the slip ring arrangement: Considering the structural space, the diameter of the brushes should be minimized while ensuring sufficient energizing capacity and structural strength, and the thickness of the insulating layer should be minimized while ensuring sufficient insulation strength and structural connection strength. 3) To ensure functionality and accuracy, comprehensive dimension chain calculations are required for the conductive rod assembly, brush holder assembly, and support: The conductive rod assembly and brush holder assembly are installed on the support. To ensure reliable installation and proper contact between the slip rings and the corresponding brushes, comprehensive design is required. 4) To ensure sufficient strength and rigidity of the support structure, appropriate materials must be selected: the support structure should be made of high-strength alloy materials to guarantee sufficient support and connection strength and rigidity. 5) To ensure the device can operate normally in harsh environments, attention should be paid to the selection of the large and small bearings at both ends: the bearings at both ends play a crucial role in ensuring smooth rotation of the device under harsh environmental conditions, preventing misalignment and separation of the brushes and slip rings. When selecting bearings, it is important to ensure that the large and small bearings at both ends have a certain rotational accuracy, sufficient radial and axial load-bearing capacity, and, while meeting the above conditions, have the smallest possible size. 6) The slip ring is one of the core components of the device, serving to transmit electrical signals. Its conductivity and structural dimensions need to be designed and calculated, and material selection should be carefully considered: based on the required power transmission capacity and the conductivity of the selected material, the structural dimensions of the slip ring should be calculated to determine the minimum structural dimensions that meet the requirements; for material selection, metal materials with high conductivity, good processing performance, and suitability for electroplating with precious metals should be chosen; for the surface electroplating layer, metal materials with good corrosion resistance and high hardness should be selected, with composite hard gold plating being preferred. 7) The brush is one of the core components of the device, serving to transmit electrical signals. Its conductivity and structural dimensions need to be designed and calculated, and attention should be paid to material selection: Based on the required power transmission capacity and the conductivity of the selected material, the structural dimensions of the brush should be calculated to determine the minimum structural dimensions that meet the requirements; in terms of material selection, metal materials with high conductivity, corrosion resistance, good hardness, and elasticity should be chosen, with precious metal alloys being preferred.

[0016] Reference Figure 1In this embodiment, the multi-ring micro long-life inertial platform slip ring conductive device includes: a conductive rod assembly 1, two sets of brush holder assemblies 2, a bracket 3, a first bearing 4, a second bearing 5, and an outer cover 13. The conductive rod assembly 1 is mounted inside the bracket 3 at both ends via the first bearing 4 and the second bearing 5, respectively; the two sets of brush holder assemblies 2 are symmetrically mounted on the outside of the bracket 3; and the outer cover 13 is mounted on the outside of the brush holder assemblies 2 to protect the internal structure.

[0017] In this embodiment, as Figure 2 As shown, the conductive rod assembly 1 mainly includes: a support frame 12 and 2N slip rings 6. The 2N slip rings 6 are arranged at intervals and installed on the support frame 12; potting compound 7 is poured between adjacent slip rings 6; a lead wire 10 is welded to each slip ring 6; the distance between adjacent slip rings 6 is 0.75mm; the surface of the slip rings 6 is electroplated with a hard gold plating layer, and the rotational life is greater than 1 million revolutions; 10≤N≤15.

[0018] In this embodiment, as Figure 3 As shown, each brush holder assembly 2 mainly includes: N brushes 8 and a brush holder 9. One end of each brush 8 is fixed to the brush holder 9, and the other end is attached to the corresponding slip ring 6; each brush 8 has a lead wire 11 welded to it. The distance between two adjacent brushes 8 in each brush holder assembly 2 is twice the distance between two adjacent slip rings 6.

[0019] In this embodiment, the manufacturing process of the conductive rod assembly is as follows: 20-30 slip rings 6 with soldered lead wires are neatly fixed on the toothed support frame 12. The lead wires pass through the slip ring holes, and all the lead wires of the slip rings pass through the opening in the large journal of the support frame 12. The above components are placed into a sealed polytetrafluoroethylene (PTFE) potting cartridge (this material has few bonding electrons on its surface, poor adhesion to adhesive, and is easy to remove after the adhesive has cured). A gap of about 5mm is left between the support frame 12 and the inner wall of the potting cartridge to facilitate the flow of adhesive. The prepared adhesive solution is poured into a dispensing tube and placed in a vacuum chamber to remove air bubbles. Then, it is placed in a high-temperature chamber and kept at the specified temperature for the specified time to allow the adhesive to fully cure. After cooling, the dispensing tube is removed, and excess adhesive and the toothed tube are removed using precision machining equipment, leaving the adhesive layer between the slip rings. The dimensions and geometric tolerances are then machined to meet the requirements of the drawings. After precision machining, a hard gold plating layer is electroplated onto the surface of the slip ring V-groove. Protective adhesive is applied to non-gold-plated areas to prevent corrosion from the gold plating solution. The potting adhesive serves to bond 20-30 slip rings and the large and small journals at both ends into a single unit, forming an insulating layer between the slip rings, allowing each slip ring to independently transmit different electrical signals. It is necessary to select an adhesive with good flowability before curing (such as multi-component epoxy resin), and the adhesive must have sufficient adhesion strength to the metal material, sufficient self-strength, and sufficient insulation strength after curing. In terms of process, it is important to ensure that all components of the adhesive are mixed evenly, and air bubbles should be removed after pouring into the mold.

[0020] In this embodiment, the manufacturing process of the brush holder assembly is as follows: 20-30 brushes with soldered lead wires are respectively installed on two precision-machined brush holders. Each brush holder holds 10-15 brushes, with the brush positions corresponding to the slip ring positions in the conductive rod assembly, ensuring sufficient insulation strength between the brushes. The brushes are installed in the grooves of the brush holders and fixed with epoxy resin. The lead wires are then neatly bundled in two groups. The brush holder itself must have sufficient structural strength and rigidity, and ensure insulation between the brushes installed on it; therefore, high-strength non-metallic materials are typically selected. To ensure alignment between the brushes and slip rings during assembly, the positions of the brushes on the brush holders can be calculated based on the slip ring positions in the conductive rod assembly.

[0021] In this embodiment, the lead wires are mainly used to transmit electrical signals from one end of the rotating part to the slip ring and brush, and then output them to the other end of the rotating part. High conductivity, small diameter, and flexible wires can be selected. Specifically, the slip ring lead wire can pass through the large journal at one end of the conductive rod assembly; the brush lead wires can be divided into four groups and pass through four small holes on the bracket.

[0022] In this embodiment, the assembly process of the multi-ring micro long-life inertial platform slip ring conductive device is as follows: A first bearing is installed at the large journal end of the conductive rod assembly, and a second bearing is installed at the small journal end; the first bearing is fixed by a boss on the large journal, and the second bearing is fixed by a special screw screwed into the small journal; at this time, the conductive rod assembly can rotate smoothly in the bracket. Further, the two sets of brush holder assemblies are respectively fixed on the two crossbeams of the bracket, so that the brush arms rest on the corresponding slip rings. By adjusting the position of the brush holder assemblies on the crossbeams, the brushes and slip rings are aligned. Further, the four sets of brush lead wires are passed through the four holes at the end of the bracket and covered with an outer cover. Thus, the assembly of the multi-ring micro long-life inertial platform slip ring conductive device is completed.

[0023] In this embodiment, the performance of the above-mentioned multi-ring micro long-life inertial platform slip ring conductive device was experimentally verified, and the experimental verification results are as follows: Contact performance: When the product is working, the slip ring and brush make good contact without any disconnection, misalignment or other poor contact phenomena.

[0024] Contact resistance: a) Static contact resistance value: The resistance value of each brush ring is consistent; the resistance fluctuation value of a single ring is not greater than 0.04Ω; b) Dynamic (when rotating or vibrating) contact resistance fluctuation value: The resistance fluctuation value of each brush ring is not greater than 0.04Ω.

[0025] Permissible current for each circuit: When the operating temperature is 55℃±2℃, the maximum current for short-term (within 20 minutes) operation is no more than 2.8A, and the long-term operating current is approximately 0.8A.

[0026] Insulation resistance: The insulation resistance between adjacent brush rings and between each brush ring and the housing is greater than 250MΩ at 250V.

[0027] Dielectric strength: Between adjacent brush rings: The dielectric strength between brush rings is tested at 250V for 1 minute, with no breakdown, sparking or corona discharge. Between brush rings and housing: The dielectric strength between brush rings and housing is tested at 560V for 1 minute, with no breakdown, sparking or corona discharge.

[0028] Working life: cumulative working life greater than 6000h, single power-on working time ≥730h, rotational life greater than 1 million revolutions.

[0029] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present 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 content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0030] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A multi-ring number micro long-life inertial platform slip ring electric conduction device, characterized in that, The utility model relates to a brush holder assembly for electric locomotive, including: Conductive pole assembly (1), two groups of brush holder assembly (2), support (3), first bearing (4), second bearing (5) and cover (13), wherein, the both ends of conductive pole assembly (1) are installed in support (3) through first bearing (4) and second bearing (5) respectively, two groups of brush holder assembly (2) are installed to the outside of support (3) symmetrically, cover (13) is installed to the outside of brush holder assembly (2), is used for protecting internal structure.

2. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 1, characterized in that, Conductive pole assembly (1) includes: support frame (12) and 2N slip rings (6), wherein, 2N slip rings (6) are arranged at intervals and are installed on support frame (12), pouring sealant (7) is poured between adjacent two slip rings (6), 10<=N<=15.

3. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 2, characterized in that, Each group of brush holder assembly (2) includes: N electric brush (8) and brush holder (9), wherein, one end of each electric brush (8) is fixed on brush holder (9), and the other end is lapped on the corresponding slip ring (6).

4. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 3, characterized in that, The distance between adjacent two electric brushes (8) in each group of brush holder assembly (2) is twice the distance between adjacent two slip rings (6).

5. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 2, characterized in that, The distance between adjacent two slip rings (6) is 0.75mm.

6. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 2, characterized in that, Each slip ring (6) is welded with a lead wire (10).

7. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 2, characterized in that, The surface of slip ring (6) is plated with hard gold plating layer, and the rotating life is greater than 1 million revolutions.

8. The multi-ring number micro long-life inertial platform slip ring electric conduction device according to claim 3, characterized in that, Each electric brush (8) is welded with a lead wire (11).

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