Qingdao Hengxin Transmission Co., Ltd. is a manufacturer and supplier specializing in transmission chain processing, anti-rust treatment, and chain sales. The company has established a complete workflow covering raw material inspection, chain plate blanking, machining, heat treatment, assembly, preloading, surface protection, and final inspection. Its products are used in agricultural machinery, logistics conveying, food packaging, mining equipment, woodworking machinery, and automated production lines.

Chain Processing and Production

The company produces single-strand, double-strand, and multi-strand roller chains, stainless steel conveyor chains, high-temperature chains, hoist chains, scraper chains, and matching connecting links. Key production steps include:

• Chain plate punching and deburring to improve dimensional accuracy and reduce stress concentration.
• Heat treatment for pins, bushings, rollers, and chain plates to achieve required hardness and toughness.
• Precision grinding of pins and bushings to ensure stable fit clearance.
• Assembly with preloading to reduce initial elongation during operation.
• Final inspection of pitch accuracy, breaking strength, surface hardness, chain length, and appearance quality.

Anti-Rust Treatment

Anti-rust protection is a core part of the company’s chain production process. Different methods are selected according to application environment and customer requirements:

• Degreasing and rust removal before surface treatment to ensure coating adhesion.
• Phosphating treatment to provide a stable base layer and improve corrosion resistance.
• Blackening treatment for general indoor use and low-corrosion environments.
• Zinc plating or nickel plating for better corrosion protection in humid or mildly corrosive conditions.
• Anti-rust oil coating for chains that require temporary protection during storage and transportation.
• Stainless steel chain options for food-grade, washdown, and highly corrosive environments.

The company controls bath temperature, treatment time, coating thickness, and drying conditions to achieve uniform protection. After anti-rust treatment, chains are inspected for surface appearance, coating adhesion, and corrosion resistance before packaging.

Sales and Customization

Qingdao Hengxin Transmission Co., Ltd. supplies standard chains from stock and manufactures custom chains according to customer drawings or operating parameters. Customers can provide pitch, number of strands, breaking load, working temperature, speed, lubrication conditions, and installation space. The company then recommends chain type, sprocket size, tensioning method, and related accessories such as sprockets, tensioners, guide rails, and connecting links.

Common applications include:

• Agricultural harvesting and seeding equipment.
• Food packaging and conveying lines.
• Logistics sorting and distribution systems.
• Woodworking machinery and panel handling equipment.
• Mining hoists and scraper conveyors.
• Environmental equipment and automotive assembly lines.

The company supports sample trial, small-batch verification, and batch delivery. After sales, it provides guidance on chain running-in, tension adjustment, lubrication intervals, and wear evaluation. For customers with batch or non-standard requirements, technical staff can help with selection, drawing confirmation, and testing support.

When selecting a chain, the company recommends confirming the following points:

• Pitch and strand count, which affect sprocket size and power transmission.
• Breaking load and safety factor based on peak load.
• Working environment and temperature, to choose stainless steel or surface-treated chains.
• Speed and lubrication conditions, to determine maintenance intervals and sealing requirements.
• Installation space and tensioning method, to decide chain length and guide layout.

Through continuous improvement of processing accuracy, anti-rust treatment, and sales service, Qingdao Hengxin Transmission Co., Ltd. aims to provide reliable chain products with stable delivery and technical support for various transmission and conveying applications.