Hanzhong Ring Speed Doubling Chain: A Smart Engine for Closed Loop Speed Increase

​​​I. Core technology: the physical code of differential motion​​​

of a circular multiplier chainClosed-loop uninterrupted conveyingIt is the core of its difference from the traditional assembly line. The essence of its speed increase stems from the diameter ratio of the roller (D) to the roller (d), following the physical formula:

​Material velocity V = (1 + D/d) × chain speed v₀​
When using a triple speed chain (D/d=3), the actual speed of the work plate can be up to 4 times the speed of the chain.

However, the practice of Hanzhong enterprises shows that.Theoretical growth rates need to be compromised for engineering effectiveness. Example:

• ​Compromise of reloading scenarios: The automotive parts production line needs to reduce the speed increase ratio (D/d ≤ 2) and use steel reinforced rollers (single point load 3.92kN), sacrificing speed for structural strength;
• ​Correction for hot and humid environments: Hanzhong summer humidity of 75%, roller and guide rail friction coefficient increases, the actual growth rate is only 82%~85% of the theoretical value.

​​​II. Hanzhong programme: four major breakthroughs in localised innovation​​​

​1. Modular aluminium guide rails: flexible retrofitting of old plants​

Aiming at the pain points of old factory buildings in Hanzhong with insufficient floor heights and uneven floors:

• ​Bolt-on guide (118 x 100mm): U-wire reorganisation completed in 72 hours, reducing 85% from conventional welding time;
• ​±30mm adjustable foot cup: Compensates for ground settlement errors and improves installation tolerance by a factor of 3;
• ​three-dimensional stratified reflux: A sensor factory adopts underground return passage + vertical lift, and the space utilisation rate is increased by 60%.

​2. Hybrid gas-electric stop systems: a new paradigm for human-machine collaboration​

plaintextmake a copy of
Pneumatic mode Electric mode
┌───────────────────┬───────────────────┐
│ Worker stepping on pneumatic valve control │ PLC programming control │
│ Response time 0.3s │ Positioning accuracy ±0.15mm │
│ Adaptable to temporary insertion order │ Beat synchronisation error <3s │
└───────────────────┴───────────────────┘
After the application of a machine tool factory in Hanzhong, the mixed-line production changeover time was shortened by 40%, and the order response speed was improved by 60%.
​3. Moisture-resistant composite chain: cracking the high humidity dilemma in southern Shaanxi Province​
For an average annual 75% humidity environment:

​POM Engineering Plastic Roller: The surface is coated with PTFE and the coefficient of friction is reduced to 0.04;
​Stainless steel sleeve + silicone filling: Blocking water vapour penetration and extending the life span from 8 months to 2 years;

A PCB company has a failure interval from 500 hours → 1500 hours.

​4. Thermal expansion millimetre gaming​
30 metres of steel chain elongation in summer when the workshop temperature reaches 40°C:


​ΔL=30000mm×11×10-⁶×22≈7.26mm​

Local Response Programme:



​Expansion joint pre-compensation: Leave a gap of 0.15mm/m at the joints of the guide rails;
​Temperature control inverter system: Automatic speed reduction of 3% for every 5°C rise in temperature to counteract sudden changes in tension.


​​​III. Industry on the ground: the leap from electronics assembly to heavy manufacturing​​​
​1. Electronics manufacturing: static electricity and microdust attack and defence​

​Copper wire brushes for electrostatic conductivity: The guide is embedded with a copper wire of resistance <10Ω to export the friction charge of the workpiece;
​Self-cleaning rollers with spiral grooves: 0.2mm spiral chute centrifugal dumping of tin slag dust;

The scrap rate of a chip placement line was reduced from 1.2% to 0.05%.

​2. Equipment Manufacturing: Mixed Light and Heavy Duty Lines Breakthroughs​
​Segmented bearer programme::

Heavy duty section: 38.1mm pitch steel chain (3.92kN load)
Precision segment: 19.05mm engineering plastic chain (anti-electrolyte corrosion)

​Transition zone for variable pitch sprockets: Stress concentration factor from 4.8 to 1.2

A transformer plant in Hanzhong realised the production of 150kg shells and 5kg coils on a common line.


​​​IV. Intelligent Evolution: From Mechanical Drive to Data Nerve​​​
Leading Hanzhong companies are upgrading their multiplier chains toProduction line decision centre::

​RFID Dynamic Beats: Workpiece board chip records process elapsed time, AI dynamically adjusts the next cycle dwell time;
​Predictive maintenance network: The drive sprocket is fitted with a vibration sensor, and the false alarm rate for faults is <9%;
​Energy consumption optimisation algorithms: Variable frequency control start/stop curve with a combined energy consumption reduction of 351 TP3T.


​​​Ask Yourself: Three Key Questions for Business Decision Making​​​

​Q1: Why is the Ring Doubling Chain suitable for SMEs in Hanzhong?​

​Double advantage of space and flexibilityClosed-loop design eliminates 30% unloaded stroke and increases output value per unit area by 50%; the gas-electric hybrid stop system supports small batch order insertion, which is suitable for Hanzhong's industrial ecology of multi-species and fast turnover.


​Q2: How do corrosion prevention solutions balance cost and longevity?​

​gradient material strategy::

Light load area: POM engineering plastic chain (cost factor 1.8X, life time 2 years +)
Heavy-duty area: Carburised steel chain + ceramic plating (cost 1.0X, life 8 months)

A valve factory in Hanzhong adopted a graded solution and reduced its full chain life cycle cost by 37%.



​Q3: What are the main time-consuming aspects of the 45-day customisation cycle?​

​Dynamic simulation accounts for 60% time: Needs to be validated in a digital twin:

Thermal expansion stress distribution (temperature difference ≥25°C scenario)
Mixed load resonance frequency point
Transition zone chain fatigue life



While the circular doubling chain of an aerospace component factory in Hanzhong is conveying precision parts at a flow rate of 2.8 metres per second, the empty tooling boards in its underground return corridor are completing the spatial cycle in a silent gesture - which reveals a new industrial logic.The real manufacturing revolution is not in the speed peak of a single piece of equipment, but in the precision synergy of the system cycleThe future competitiveness of Hanzhong's smart manufacturing may lie in the constant beat of this ring. The future of Hanzhong's intellectual competitiveness may be hidden in this interlocking constant beat.