Air-Blowing Equipment | Train Underbody Air-Blowing Robot System | Air-Blowing Robot-DITT (Hangzhou) Technology Co., Ltd.

Train Underbody Air-Blowing Robot System

Precise positioning, on-demand air blowing and closed-loop dust collection.

This fully automated under-vehicle cleaning system integrates a six-axis robotic arm, a linear sliding table, a profile scanning module, an intelligent navigation system, and an efficient dust removal device. It enables end-to-end automated operations—including precise positioning, on-demand cleaning, and closed-loop dust removal—for various components of rail transit vehicles, such as traction boxes, traction motors, air compressors, and auxiliary power boxes. By replacing traditional manual cleaning operations, this system significantly enhances operational efficiency and standardizes cleaning procedures, and has already been widely deployed in the depots of multiple urban rail transit lines.

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Solution

For under-carriage cleaning and dust removal applications in rail transit depot environments, we provide a comprehensive automated under-carriage cleaning robot solution. This solution integrates a cleaning robot unit, a dust removal unit, an intelligent navigation and contour scanning unit, and an operational control system, replacing traditional manual handheld cleaning operations. It enables precise coverage of all critical under-carriage components—including traction boxes, traction motors, air compressors, and auxiliary power boxes—while allowing customization of cleaning strategies and intensity levels based on vehicle model and specific component requirements. The system is further equipped with a negative-pressure dust collection system to achieve closed-loop dust collection and treatment. The solution can seamlessly integrate with existing depot operational workflows, support dual-site remote management (on-site and DCC), and help customers achieve automation, standardization, and environmental compliance upgrades for under-carriage cleaning operations. It is well-suited to meet daily operational and maintenance needs across various rail transit depot types, including metro and suburban rapid transit systems.

Overall Technical Parameters

Technical Specifications	Specific parameter items	parameter values
system composition	Purging Robot	1 set
	dust separation plant	2 set
	Contour Scanning Module	1 set
	Control terminal	1 set
Motion Platform	overall dimensions	1300×800×900mm
	weight of equipment	≤650kg
	translation distance	255mm
	Lifting distance	500mm
Six-axis robotic arm	model	JAKA Zu5
	working radius	954mm
	Repositioning Accuracy	±0.02mm
navigation and location	Overall navigation and positioning accuracy	±10mm
	Magnetic navigation detection accuracy	1mm
	Magnetic navigation response time	5ms
	3D depth resolution	1280×720
	3D depth accuracy	5mm
Purge system	gas displacement	250L/min
	Purge pressure	0.4-0.7MPa
	Adjust gear	High / Medium / Low three‑level settings
dust-removal system	Maximum negative pressure	1000Pa
	air flow rate	5000L/min
	Filtering precision	10-15μm
	filter efficiency	99.5%
	filter area	72㎡

Working Principle

(1) Introduction Based on magnetic‑strip navigation and RFID positioning, the system realizes preliminary identification of vehicle body position. The 3D profile scanning module collects three‑dimensional information of under‑vehicle components for secondary position correction. The control system plans the optimal blowing path and drives the six‑axis robotic arm to move the blowing nozzle along the preset trajectory, delivering high‑pressure clean airflow to remove floating dust and debris on the surfaces of under‑vehicle components. Meanwhile, the dust‑removal system is activated to create an enclosed negative‑pressure space in the blowing area via dust shields and air curtains. Dust‑laden gas is collected by double‑sided air suction ports and filtered through high‑precision membrane‑coated filter elements before clean air is discharged. Supported by intelligent algorithms and multiple types of sensors, the system implements safety protection and operation management, with the whole process requiring no manual intervention. (2) Process Flow Chart Vehicle positioning → Profile scanning and identification → Navigation and positioning correction → Path planning → Robotic‑arm blowing operation → Synchronous dust removal and filtration → Operation effect verification → Equipment reset

Why Choose Us

Multi-point precise purging

Integrating multi-modal correction technologies—including magnetic stripe navigation, RFID positioning, and 3D scanning—along with a six-axis robotic arm featuring repeat positioning accuracy of ±0.02 mm, this system ensures precisely controllable cleaning positioning, providing comprehensive coverage of all under-vehicle components.

The purge parameters are flexibly adjustable

The purge pressure ranges from 0.4–0.7 MPa, with three adjustable settings: high, medium, and low. The exhaust flow rate reaches 250 L/min, and the number of purge cycles can be configured based on the degree of contamination of the components, making it suitable for diverse cleaning requirements.

Closed-loop dust removal: green and environmentally friendly

The dust shield and air curtain together create a sealed negative-pressure zone, while dual-sided suction enhances dust collection efficiency; when paired with a high-precision laminated filter element, it achieves a filtration efficiency of 99.5%, supports automatic pulse reverse-blowing for dust cleaning, and prevents secondary dust generation.

Intelligent control ensures safety and reliability.

Equipped with an operational management system, it supports customizable purge tasks and remote control across multiple endpoints; it also features multiple safety protection mechanisms—including lidar, ultrasonic radar, and physical collision avoidance—enabling safe, unmanned operations.

About Us

Founded in 2018, DITT applies AI visual intelligence to rail transit. Built on our own visual perception algorithms, intelligent hardware and O&M systems, we deliver a full inspection portfolio spanning onboard and wayside applications, now serving 20+ rail transit systems across China.

Together with our subsidiaries — Zhonggang Maintenance, Zhongshu Laser and Yunshang Urban Rail — we are moving rail transit O&M toward predictive maintenance and full-lifecycle management.

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Company Establishment

Invention Patents

Metro Clients Served

0%+

R&D Proportion of Revenue

Latest News

DITT Makes a Striking Appearance at MetroTrans 2025 China International Urban Rail Transit Exhibition and CAMET Forum

On September 18, the three-day "2025 China International Urban Rail Transit Exhibition" (MetroTrans 2025) officially opened at the CRCC Qingdao World Expo City.

1970-01-01 View Details

The EMU Intelligent Inspection System Application Project Jointly Developed by DITT and Changzhou Metro Passes Expert Review

On August 30, 2025, Changzhou Metro Group held the "Changzhou Metro Line 1 EMU Intelligent Inspection System Expert Review Meeting" at the Baizhang Depot.

1970-01-01 View Details

Frequently Asked Questions

Can this equipment be adapted for under-vehicle cleaning of different vehicle models?

Yes. The system supports the addition of new vehicle models and component information, is compatible with a variety of urban rail vehicles, and allows for the customization of corresponding purge schemes based on the undercarriage component layout of different vehicle models.

Can the purge pressure and the number of purge cycles be adjusted?

Yes. The equipment's purge pressure is adjustable within the range of 0.4–0.7 MPa, with three preset levels: high, medium, and low; additionally, the number of purge cycles can be configured based on the degree of contamination of the components, allowing flexible adaptation to diverse cleaning requirements.

How does the equipment ensure the accuracy of the purge positioning?

The equipment employs a multi-stage positioning correction mechanism: initial positioning is achieved via magnetic stripe navigation and RFID positioning, followed by secondary correction using a 3D scanning module and the end effector of the robotic arm; the overall navigation and positioning accuracy is ±10 mm, while the robotic arm's repeatability accuracy is ±0.02 mm, ensuring precise purge positioning.

Can the dust generated during purging cause secondary pollution?

No. The equipment is equipped with a dust removal system that utilizes a dust shield and a air curtain to create a sealed negative-pressure zone, with dust collected via dual-sided suction. The dust-laden gas is then filtered through a high-precision filter element (10–15 μm), achieving a filtration efficiency of 99.5%. The system also supports automatic pulse reverse-blowing for dust cleaning, ensuring no secondary dust generation.

Does the device support remote management?

Support: The system is equipped with an operational management system that enables dual-terminal remote management—via both on-site control terminals and the DCC—thereby facilitating managers in assigning tasks and monitoring equipment operating status.

What safety protection measures are implemented for the equipment?

The equipment features four layers of safety protection: first, an algorithmic simulation of motion trajectories to prevent collisions with components; second, dual-sided coverage by a 270° LiDAR sensor, providing three-level warning alerts based on the distance to obstacles; third, supplementary detection via ultrasonic radar; and fourth, hardware safeguards—including physical anti-collision strips and emergency stop buttons—ensuring comprehensive operational safety.

What are some real-world application cases for this equipment?

The equipment has been successfully deployed in multiple rail transit projects, including Line 15 of Hangzhou, Line 18 of Hangzhou, the Xiejia Village Depot of Line 17 of Beijing, and the Wuyang Depot of the Hangzhou–Deqing Metropolitan Railway.