Electrical Testing & Sorting

Switch Testing & Marking Systems

Automated rotary testing station for refrigerator door switches and contact blocks – electrical continuity testing, automatic ink marking, and sorting in a 4-sec cycle.

Project Overview

High-Volume Switch Continuity & Verification

The Switch Testing & Marking System is an ultra-fast automated inspection SPM engineered by Tri-Dot Solution for household appliance manufacturers. It conducts rigorous electrical continuity, contact resistance, and actuation travel testing on refrigerator door switches and contact blocks.

The machine features a high-precision rotary Indexer Table with multi-cavity fixtures, a micro-ohm Continuity Checking Unit, a pneumatic Ink Marking System, and an automated Ejection & Sorting Mechanism.

Operating with an impressive cycle time of just 4 seconds per component, the machine physically marks approved switches and segregates defective contact blocks into a locked reject bin, guaranteeing 100% outgoing quality.

Switch Testing & Marking Systems
Engineering Elements

Station Architecture & Subsystems

Rotary Indexer Mechanism

High-speed cam indexing table with synchronized dial plate moves switches through loading, testing, marking, and ejection.

  • Precise station-to-station indexing
  • Low inertia, smooth stopping
  • Heavy-duty bearing assembly

Electrical Continuity Tester

Precision probe head checks NO/NC contact state, contact bounce, and milliohm electrical resistance across switch poles.

  • NO/NC actuation verification
  • Contact resistance evaluation
  • High-durability spring probes

Automated Ink Marking System

Pneumatic fast-acting ink stamp or inkjet head applies a clear, indelible OK mark on switches passing all electrical checks.

  • Fast-drying industrial ink
  • Adjustable marking force
  • Visual identification badge

Interchangeable Multi-Fixtures

Modular nest inserts enable testing a wide variety of door switch models, toggle switches, and modular contact blocks.

  • Quick tool-less changeover
  • Built-in part seating sensors
  • Anti-wear composite tooling

Ejection & Sorting Mechanism

Separate positive pneumatic chutes segregate OK components into packaging bins and NOK components into locked rejection bins.

  • Positive air-assisted discharge
  • Rejection bin monitoring
  • Counter verification sensor

Digital Counter & PLC Panel

Integrated HMI touchscreen displays total production count, OK/NOK totals, rejection percentage, and contact diagnostics.

  • Shift production auditing
  • Failure mode categorization
  • Operator alert beacon tower
Performance Metrics

Technical Specifications

4s
Cycle Time: 4 Sec

Indexes, tests electrical continuity, marks OK, and ejects into sorted bins every 4 seconds (900 switches/hour).

100%
Electrical Continuity

Verifies both open (NO) and closed (NC) circuit states and detects high-resistance faulty contacts.

Ink
Physical OK Marking

Positive physical mark prevents any uninspected switch from being mixed with validated components.

Key Benefits

Why Automate Switch Inspection

Eliminates Faulty Appliance Switches – 100% circuit verification.
High Production Throughput – 4-second cycle handles massive appliance volumes.
Foolproof Segregation – Physically separates good and bad switches.
Permanent Identification – Crisp automated ink stamp on OK items.
Flexible Tooling – Fast adjustment for multiple switch variations.
Project Summary

Machine Specifications

  • Application: Refrigerator Door Switch Testing & Marking
  • Component: Variety of Door Switches & Contact Blocks
  • Cycle Time: 4 Seconds / Component
  • Test Type: Electrical Continuity & Contact Resistance
  • Marking & Sort: Pneumatic Ink Marking + Sorting Unit

Engineered by Tri-Dot Solution

Engineered in Pune for leading electrical switchgear and consumer durable OEMs requiring high-speed zero-defect automation.

Need an Electrical Switch Testing SPM?

Let us engineer custom high-speed testing, marking, and sorting automation for your switch assemblies.

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