Double Plus Chain
Designed specifically for automated production lines, the double-speed rollers utilize the differential speed principle of large and small rollers, allowing the tooling plate to travel at speeds far exceeding those of the chain itself, commonly reaching 2x or 3x speed. They enable efficient storage and warehousing, and allow for lazy positioning of workstations, ensuring smooth, low-speed operation and precise positioning. With a simple and easy-to-maintain structure, they are available in various layouts, including circular and high-profile designs, and are widely used in electronics, new energy, and auto parts industries.
Product Overview
Utilizing a differential speed transmission structure with large and small rollers, the tooling pallet's operating speed far exceeds that of the chain, effectively improving the material conveying efficiency of the entire production line and accelerating the production cycle.
Materials at workstations can be paused at any time while the chain continues to operate normally, flexibly adapting to the production cycle.
Smooth and stable overall operation, with minimal deviation or wobbling. High repeatability ensures high precision, fully meeting the high-precision production requirements of precision component assembly and testing.
The main body is made of high-quality alloy material, offering strong load-bearing capacity, wear resistance, and durability. The overall structure is simple and compact, with few malfunctions, making daily maintenance and repair convenient and worry-free.
The chain operates at low speed, with flexible contact transmission from the rollers, resulting in low vibration and noise, creating a clean and quiet workshop production environment.
Application Scenarios
Utilizing differential speed conveying and precise positioning, this line smoothly transports various electronic components and complete products. Workstations can be flexibly paused and buffered, adapting to multi-process, step-by-step operations. It operates smoothly without shaking, meeting the full-process production needs of precision products such as mobile phones, home appliances, and industrial control equipment in assembly, testing, and debugging.
With excellent load-bearing capacity and smooth conveying performance, it can stably transport new energy components such as lithium batteries, motors, and electronic controls. It supports circular loop routing, adapting to processes such as cell assembly, module assembly, and finished product testing, effectively improving the efficiency of large-scale production of new energy products.
With a robust and durable structure, it can bear various light and heavy automotive parts, ensuring smooth and low-vibration transport. It can be equipped with lifting and blocking mechanisms to complete workstation flow and positioning, and is widely used for processing and assembling conveyor operations of interior parts, chassis parts, and engine parts.
High-precision conveyor operation, smooth start-up and stop without jamming, allowing workpieces to be precisely positioned at the inspection station. Meets the requirements of appearance inspection, performance testing, and quality verification, significantly improving product quality inspection efficiency and accuracy.
Can be built with double-layer, circular, and zigzag three-dimensional conveyor lines, making full use of limited workshop space. Enables automatic circulation and return of tooling pallets, eliminating the need for manual transfer. Suitable for integrated automated production scenarios such as multi-station cyclic processing and aging testing.
Full Series Specifications
Common specifications for Double Plus Chain are listed below. Custom sizes and non-standard options are available upon request. Please contact us for more details.
| JB Chain No. | Matech Chain No. | Pitch | Roller dimension | Pin diameter | Pin length | Plate dimension | Weight per meter | ||||||
| P | d1 max | d8 max | b1 min | b8 max | d2 max | L max | Lc max | h2 ma x | T max | t max | q | ||
| mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | mm | kg/m | ||
| BS25-C206B | 19*8*1 | 19.05 | 11.91 | 18.3 | 4.00 | 8.0 | 3.28 | 24.0 | 25.6 | 8.20 | 1.30 | 1.50 | 0.52 |
| BS25-C208A | 25*11*1 | 25.40 | 15.88 | 24.6 | 5.70 | 10.3 | 3.96 | 31.0 | 32.8 | 11.70 | 1.50 | 1.50 | 0.79 |
| BS25-C210A | 31*15*2 | 31.75 | 19.05 | 30.6 | 7.10 | 13.0 | 5.08 | 39.5 | 41.2 | 15.00 | 2.00 | 2.03 | 1.36 |
| BS25-C212A | 38*18*3 | 38.10 | 22.23 | 36.6 | 8.50 | 15.5 | 5.94 | 50.3 | 52.8 | 18.00 | 3.00 | 4.00 | 2.24 |
| BS25-C216A | 50*24*4 | 50.80 | 28.58 | 49.0 | 11.00 | 21.5 | 7.92 | 66.2 | 70.0 | 24.00 | 4.00 | 4.80 | 4.06 |
| BS30-C206B | 19*7*1 | 19.05 | 9.00 | 18.3 | 4.50 | 9.1 | 3.28 | 26.3 | 29.6 | 7.28 | 1.30 | 1.50 | 0.50 |
| BS30-C208A | 25*9*1 | 25.40 | 11.91 | 24.6 | 6.10 | 12.5 | 3.96 | 35.6 | 39.5 | 9.60 | 1.50 | 2.00 | 0.83 |
| BS30-C210A | 31*12*2 | 31.75 | 14.80 | 30.6 | 7.50 | 15.0 | 5.08 | 43.0 | 47.1 | 12.20 | 2.00 | 2.40 | 1.27 |
| BS30-C212A | 38*15*3 | 38.10 | 18.00 | 37.0 | 9.75 | 20.0 | 5.94 | 58.1 | 62.7 | 15.00 | 3.00 | 4.00 | 2.14 |
| BS30-C216A | 50*18*4 | 50.80 | 22.23 | 49.0 | 12.00 | 25.2 | 7.92 | 71.9 | 77.3 | 18.60 | 4.00 | 5.00 | 3.55 |
Customized Services
Need something beyond standard models? We offer complete custom solutions—from bore diameter and materials to attachments and pitch—designed for your application. All dimensions can be customized. Contact us for special requirements.
| Customization Item | Key Options | Professional Description (For Tooling / Assembly Lines) |
| Material | Carbon Steel 40Mn, Stainless Steel 304/316, Engineering Plastic POM, Alloy Steel | 40Mn carbon steel for standard tooling lines; stainless steel for food/wet/corrosive environments; POM for light-load & quiet operation; alloy steel for heavy-load & high wear resistance |
| Surface Treatment | Black oxide + quenching, Zinc plating (electro-galvanized / hot-dip galvanized), Hard chrome plating, Passivation & polishing, Carburizing hardening | Black oxide offers cost-effectiveness with wear & rust resistance; zinc plating suits humid workshop conditions; hard chrome plating improves roller smoothness and prevents scratching; carburizing hardening is recommended for high-temperature conditions |
| Roller Type (Key for Double Plus Chain) | Standard 3× speed roller, Silent rubber-coated roller, Thickened wear-resistant roller, Anti-drop double-pitch roller, Large-diameter reinforced roller | Standard 3× speed rollers for typical production lines; rubber-coated rollers for clean/quiet workshops; thickened or large-diameter reinforced rollers for heavy-duty tooling and pallet conveying to prevent jamming and chain detachment |
| Plate Thickness | Standard (for regular tooling), Thickened 1.2 / 1.5 / 2.0 mm, Heavy-duty extra-thick | Standard thickness for light loads (≤5 kg); thickened plates are mandatory for heavy tooling and full-pallet conveying to prevent plate elongation, deformation, and misalignment |
| Length | Custom by pitch count, Cut by meter, With connecting links, Tension reserve, Closed-loop custom | Precisely matched to conveyor frame wheelbase; tension adjustment reserve is mandatory to accommodate head and tail unit installation and debugging |
| Attachments | K-type / CK-type bent attachments, Side guides / side plates, Side-mounted pushers, Pallet locating pins, Widened ears, Anti-slip pads | Required when fixing pallets, stopping materials, or side-diverting flow; pusher + locating pin combination is commonly used on double speed lines for automated loading/unloading |
| Temperature Resistance | Normal (-15°C to 80°C), Medium temperature (150°C), High temperature (250°C), Low-temperature anti-freeze | High-temperature configuration for drying/baking lines; low-temperature lines (cold storage) require anti-brittle special materials + specialized grease |
| Matching Sprockets | 3× speed dedicated hardened sprockets, Non-standard pitch, Single-row / Double-row, Custom keyway / bore, Wear-resistant tooth hardening | Sprockets must match the pitch of double speed rollers; tooth hardening prevents wear; custom bores and keyways available based on motor shaft and drive shaft specifications |
| Special Features | Anti-static (for electronics workshops), Food-grade lubrication, Acid/alkali corrosion resistance, Dust-proof sealing, Ultra-low noise, Anti-misalignment guiding | Anti-static is mandatory for electronics / chip production lines; acid/alkali resistance for chemical/washdown lines; dust-proof + low-noise configuration for precision assembly lines |
Quality Inspection Equipment
At Matech, we understand the critical role of double plus chains in automated conveying systems. That’s why we have equipped our production base with advanced quality inspection devices specifically for double plus chains, establishing a rigorous quality control system covering the entire manufacturing process.
From precision stamping and specialized heat treatment to automated assembly lines, every step integrates real‑time inspection checkpoints. Our quality inspection equipment includes:
Hardness Testers – ensuring excellent wear resistance of chain plates and pins.
Tensile Testing Machines – verifying tensile strength and reliability under high‑load conditions
Precision Dimension Measuring Devices – guaranteeing consistent pitch and dimensional accuracy for every chain link.
Every double plus chain must pass strict validation by the above equipment before leaving our factory, ensuring stable and smooth conveying performance even in demanding environments with high humidity, high sugar exposure, or heavy loads. The integration of advanced equipment and stringent quality control reflects Matech’s strength as a trusted professional chain manufacturer.
Frequently Asked Questions
1
What is the core difference between double plus chains and ordinary conveyor chains in terms of speed increase principle?
The core of a double plus chain lies in the special speed ratio design between the inner/outer plates and the rollers. While rollers and sprockets move almost synchronously on ordinary chains, double plus chains use large-diameter stepped rollers. When the sprocket drives the chain, the rollers roll relative to the guide rail, enabling the workpiece pallet placed on the chain to move at a speed 2.5 times faster than the chain itself. This design achieves rapid accumulation and high-speed transfer between workstations while reducing wear on the chain itself.
2
How do double plus chains prevent jamming and creeping during accumulation conveying?
Accumulation (workpiece stopped while the chain continues running) is a typical operating condition for double plus chains. Our double plus chains feature precision-matched roller and bushing clearances, along with self-lubricating bushings or pre-filled grease inside the roller bore, ensuring low-friction rolling between the roller and bushing during accumulation to avoid “creeping” caused by unstable friction. In addition, the plate surfaces are smoothly finished to reduce viscous resistance against the pallet bottom, ensuring smooth accumulation and easy restart.
3
How do double plus chains ensure wear resistance under high-speed and frequent start-stop conditions?
Double plus chains are often used in assembly lines and packaging lines with frequent starts and stops. Our double plus chains use precision-stamped alloy steel plates, with pins and bushings treated by carbonitriding heat treatment, achieving a surface hardness of over HV 700 while maintaining core toughness. We also offer carburized rollers and through-hardened pins, extending wear life to more than 1.5 times that of standard double plus chains. For extreme high-frequency applications, oil-immersed chains or forced lubrication systems are also available.
4
Can double plus chains operate in humid, dusty, or corrosive environments?
Yes. We offer multiple solutions based on the application environment:
Humid or washdown environments: 304/316 stainless steel, or nickel-plated/Dacromet-coated carbon steel.
Dusty environments: Sealed roller design to reduce dust ingress into the bushing-pin gap.
Corrosive media: All-stainless steel double plus chains or food-grade solid lubrication options. All corrosion-resistant double plus chains are validated by salt spray tests before shipment, ensuring reliable operation in harsh conditions.
Humid or washdown environments: 304/316 stainless steel, or nickel-plated/Dacromet-coated carbon steel.
Dusty environments: Sealed roller design to reduce dust ingress into the bushing-pin gap.
Corrosive media: All-stainless steel double plus chains or food-grade solid lubrication options. All corrosion-resistant double plus chains are validated by salt spray tests before shipment, ensuring reliable operation in harsh conditions.
5
Can double plus chains directly replace standard double plus chains on existing conveyor lines?
Absolutely. Our double plus chains strictly follow industry standard pitches (e.g., 31.75mm, 50.8mm) as well as key dimensions such as plate height and roller outer diameter, making them fully interchangeable with major brands. We also support custom attachment plates (e.g., adding stops, guides, etc.) for quick replacement without modifying the main conveyor structure. If the original line has special speed ratio requirements, we can fine-tune the roller diameter based on actual operating parameters.
Contact Us
To purchase or customize Double Plus Chains,please fill out the form below. Our team will get back to you within 24 hours.
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