Closed-Circuit Circulation System with Electroplating Oxidation Production Line

Product Specification

Equipment Description:

I. Process flow

1. Pretreatment: degreasing → pickling → water washing (removing surface oil and oxides).
2. Loading into the drum: small parts are loaded into the drum and sealed, and enter the electroplating tank through the conveying system.
3. Roll galvanizing: the drum rotates continuously to make the parts roll, and the zinc layer is deposited by current in the galvanizing tank, and the plating solution is circulated and renewed through the small holes.
4. Post-treatment: passivation → water washing → centrifugal drying → drying (enhancing corrosion resistance and completing surface treatment).

II. Technical features

High efficiency: fully automated conveying and drum coordination, the daily processing capacity of a single line can reach several tons, suitable for batch production.
Uniformity: The drum rolls to make the surface of the parts without dead corners, and the coating thickness error is ≤±3μm.
Flexibility: supports customized processes (such as roll zinc/nickel/copper), suitable for small hardware such as screws, springs, and connectors. ‌Environmental protection‌: The closed-circuit circulation system reduces wastewater discharge, and the utilization rate of the plating solution reaches more than 95%.

‌III. Application areas‌ ‌

Fasteners‌: screws, nuts, gaskets, etc. ‌Auto parts‌: bearings, springs, pinions. ‌

Electronic hardware‌: connectors, terminals, precision stamping parts.

Main structures and components:

Core equipment composition ‌
‌1. Roller device ‌
‌Drum body ‌: It adopts a hexagonal prism or horizontal cylinder structure, and the wall plate has dense small holes (aperture 1-3mm) to ensure the circulation of plating solution and gas discharge. The drum material is mostly PP or PVC, which has strong corrosion resistance. ‌Drive system ‌: It is equipped with a reduction motor to drive the drum to rotate continuously (speed 3-12r/min), and the parts are evenly contacted with the cathode conductive device through rolling. ‌Conductive design ‌: The inner wall of the drum is embedded with copper bars or graphite cathode conductive contacts, and the parts contact the cathode through gravity to form a conductive circuit. ‌

2. Plating tank system ‌
‌Galvanizing main tank ‌: It contains zinc plating solution (usually cyanide or chloride system), the tank body is made of PVC or rubber-lined steel tank, equipped with heating pipes and circulation pumps. ‌Auxiliary tank group ‌: It includes degreasing tank (alkaline solution), pickling tank (hydrochloric acid or sulfuric acid), water washing tank and passivation tank to realize pre-treatment and post-treatment functions. ‌

‌3. Conveying equipment‌
‌Gantry robot arm/track trolley‌: Automatically grab the roller and transfer it to each process slot to support continuous production rhythm.
‌4. Power supply and control system‌
‌DC rectifier‌: Output 0-12V adjustable voltage, maximum current can reach 5000A, adapted to the total surface area requirements of the parts in the roller.
‌PLC control module‌: Real-time monitoring of current density, plating solution temperature (20-40℃) and pH value (4.5-5.5), automatic adjustment of process parameters.
‌5. Post-processing equipment‌
‌Centrifugal dryer‌: Remove residual plating solution on the surface of parts through high-speed rotation (800-1200r/min).
‌Drying box‌: Hot air circulation system (temperature 60-80℃) quickly dries parts to prevent oxidation.

‌II. Auxiliary and environmental protection components‌
‌Waste gas treatment system‌: Install a gas collection hood above the pickling and electroplating tanks to neutralize acidic gases (such as HCl, HCN) through an alkali spray tower.
‌Wastewater recovery device‌: Use ion exchange resin or membrane separation technology to recover metal ions in the plating solution and reduce wastewater discharge.
‌Hanging tools and hanging baskets‌: Used for loading and unloading parts, made of titanium or stainless steel, corrosion-resistant and stable conductivity.

‌III. Technical parameter examples‌
‌Drum capacity‌: Single drum load 50-200kg (depending on the model, such as TW-E02 model is 80kg).
‌Coating thickness‌: 5-25μm (adjustable), uniformity error ≤±3μm.
‌Capacity‌: Single line daily processing capacity 2-8 tons (depending on part size and plating speed).

Features:

1.High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
2.The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
3. It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.