You are here: Riveting Process and Equipment Choice for Charging Piles, Distribution Cabinets and PV-Inverter Housings - CHANRUI
Power-electronics equipment such as charging piles, distribution cabinets, PV inverters and energy-storage converters mostly use sheet-metal housings and are deployed outdoors or semi-outdoors, so their demands for corrosion protection, sealing and joining reliability go beyond those of ordinary indoor cabinets. Riveting (blind rivets + rivet nuts) is one of the main mechanical joining methods for such products, and process details directly affect the protection rating and long-term reliability.
I. Joining requirements of outdoor power equipment
Firstly, corrosion protection: outdoor temperature swings, rain and salt spray call for fastener-to-sheet material matching, commonly stainless rivets/nuts or Dacromet/zinc plating; secondly, sealing and protection: doors and covers must satisfy the IP protection rating, and threaded holes needing sealing should prefer blind (closed-end) rivet nuts; thirdly, reliable electrical bonding: grounding parts, busbar brackets and device-mounting beams carry device weight and vibration and must not loosen; fourthly, post-coating assembly: cabinets are riveted after powder coating, and the coating layer must not be damaged.
II. Typical areas and fastener selection
| Area | Joining point | Recommended fastener |
|---|---|---|
| Door/hinge/lock rod | Frequent opening/closing, anti-vibration | Stainless blind rivets, structural type at load-bearing points |
| Device mounting plate/beam | Mounting breakers, modules, terminal blocks | Hexagonal or knurled rivet nuts, anti-rotation, torsion-resistant |
| Waterproof cover/base | Requires sealing against liquid ingress | Blind closed-end rivet nuts + sealing washers |
| Grounding parts | Grounding continuity, locking against loosening | Anti-loosening rivets/nuts that keep mating faces conductive |
| Heat sink/outer cover | Thin-wall, appearance face | Countersunk rivets/nuts kept flush with surface |
III. Key process points
Firstly, choose through-hole vs blind hole by area: ordinary internal threads can use the through-hole type, whereas waterproof areas must use the blind closed-end type; for the operating difference seeOperating Points for Through-Hole and Blind-Hole Rivet Nuts; secondly, strictly follow the spec table for pre-holes, matching hexagonal nuts with hexagonal holes - over-tolerance hole diameter is the main cause of nut spinning and water seepage; thirdly, when riveting after powder coating, strip the coating at grounding areas or use grounding pierce washers to ensure grounding continuity; fourthly, run waterproof verification on the first article at sealing areas; fifthly, stainless fasteners harden markedly during processing, so equipment pulling force and lead screws must be configured by spec. For the fastener-type comparison seeCylindrical, Hexagonal, Through-Hole and Blind-Hole Type Comparison。
IV. Advice on equipment selection
Power cabinets are large, heavy and difficult to flip, so lines are built aroundhandheld auto-feed equipment: automatic riveting machines handle frame and door rivets while automatic rivet nut tools handle mounting-plate threaded holes; operators work around the cabinet, with nails/nuts auto-fed through the tube to the gun head. Fixed special machines fit batch processing of regular flat parts such as doors and mounting plates; robotic cells fit very high-volume standard cabinets. Charging-pile and distribution-cabinet companies nationwide can book the manufacturer to bring machines on-site and sample on real cabinets.
FAQ on Power-Equipment Riveting
FAQ on the Power Industry
As a rule choose stainless rivets or Dacromet-treated rivets; coastal or high-humidity environments prefer stainless, minding electrochemical compatibility with aluminum panels.
Use blind closed-end rivet nuts with sealing washers for waterproof threaded holes, run water-spray/air-tightness verification on the first article, and sample at intervals within batches.
Powder-coated faces must conduct at grounding points - use pierce washers or reserve conductive areas before riveting, and carry out grounding-resistance tests per electrical norms.
Switch specs by changing lead screws, riveting heads and channels; label clearly and confirm the first article, and multi-spec stations are advised to manage spec-divided material boxes.
Yes; select the spec by plate thickness, use small-spec nuts on thin sheets with controlled pulling force, and send sample sheets for trial riveting first.
Riveting Process Assessment for Charging Piles / Distribution Cabinets
Solutions are offered according to cabinet material, protection rating and fastener spec, with nationwide on-site trials; consultation hotline +86 13268883882.
V. Rollout advice for power-equipment companies
We suggest a three-step rollout: step one, pilot on one main outdoor cabinet model and work out the fastener solutions for the three area types (doors, mounting plates, waterproof covers) at once, mapping which points use stainless rivets, hexagonal rivet nuts and blind nuts, to form a process standard; step two, finish three verifications at the first-article stage - thread go/no-go and pull-out tests, water-spray verification of waterproof areas, and grounding-continuity tests - and record the results in work instructions; step three, configure equipment and spares, using handheld auto-feed riveting machines and rivet nut tools for cabinet final assembly, evaluating fixed solutions for regular parts such as doors, and stocking common lead screws, riveting heads and seal rings by spec. Because outdoor-cabinet batches are relatively stable, equipment utilization and payback are easy to estimate; for maintenance support seeAutomatic Riveting Machine Maintenance and Parts Supply Guide。
Recommended reading:Rivet Nut Gun Common Faults and Installation Troubleshooting · Why Server-Cabinet & Data-Center Industries Use Automatic Riveting Machines · Automatic Rivet Nut Tool
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