---
title: "World's Largest Tonnage Range-Extended Rotary Drilling Rig Rolls Off Production Line in Changsha, Hunan"
type: "News"
locale: "zh-HK"
url: "https://longbridge.com/zh-HK/news/281124037.md"
description: "The world's largest tonnage range-extended rotary drilling rig has rolled off the production line in Changsha, Hunan. It has an operating weight of 200 tons, a torque of 620,000 Nm, and a hole diameter of 3,500 mm. The rig has achieved technological breakthroughs in areas such as multi-motor synchronization and transient large load buffering control, securing over ten patents. The drill pipe lifespan has been extended by 20%, impact vibration reduced by 15%, and the energy recovery rate exceeds 70%. Each descent can recover 5 kWh of electricity, resulting in an overall energy saving of 5%-10%"
datetime: "2026-03-31T04:47:00.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/281124037.md)
  - [en](https://longbridge.com/en/news/281124037.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/281124037.md)
---

> 支持的語言: [简体中文](https://longbridge.com/zh-CN/news/281124037.md) | [English](https://longbridge.com/en/news/281124037.md)


# World's Largest Tonnage Range-Extended Rotary Drilling Rig Rolls Off Production Line in Changsha, Hunan

The world's largest tonnage range-extended rotary drilling rig has been launched in Changsha, Hunan. This drilling rig has an operating weight of 200 tons, a torque of 620,000 Newton-meters (Nm), and a hole diameter of 3,500 millimeters. It has achieved key core technology breakthroughs in multi-motor synchronization, transient large load buffering control, and main hoist potential energy recovery, among other areas. The rig has obtained over ten related authorized patents and has achieved high-precision synchronization of multi-motor speed and torque with a dual closed-loop system. The lifespan of the drill pipes and tools has been extended by 20%, impact and vibration have been reduced by 15%, and the energy recovery rate reaches over 70%. Each descent can recover up to 5 kWh of electricity, which is used for cabin heating and auxiliary battery heating in low-temperature environments, leading to an overall energy saving of 5%-10%. (CCTV News)

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