Mill Liner Handler

Product Introduction

The Mill Liner Handler, also known as a relining crane, is specialized maintenance equipment developed by Chunhua Group for liner replacement in large ball mills and semi-autogenous (SAG) mills. Drawing on years of experience serving the mining industry, Chunhua developed the JXS series to support mill relining operations in demanding industrial environments.

The JXS Mill Liner Handler integrates a travelling system, a main beam travelling mechanism, a hydraulic working arm, a crane system, a lining trolley, and an electrical control system. Its compact configuration enables the working equipment to extend into the mill through the feed opening, supporting liner removal, transportation, and installation, as well as impact-assisted removal of seized liner bolts when equipped with the appropriate tooling.

The JXS series evolved from Type I to Type V through approximately five years of development and application experience, with design improvements intended to better meet practical maintenance requirements. The equipment is designed to improve relining efficiency, facilitate maintenance, and reduce personnel exposure to hazardous manual operations.

Key Features

• Designed for Ball Mills and SAG Mills: Developed specifically for mill liner replacement and maintenance applications. The documented JXS series is suitable for mills with feed openings larger than 1.1 m, subject to confirmation of the complete equipment configuration and access requirements.
• Rail-Mounted or Rail-Less Travel: The standard travelling arrangement uses rails customized to the site track gauge. A rail-less option is also available, using steel wheels with high-strength polyurethane coverings and hydraulic motor drive.
• Multi-Directional Mobility Option: The documented rail-less configuration uses four hydraulically driven wheels and supports in-place turning and movement in different directions on suitable paved surfaces.
• Main Beam Travelling Mechanism: An independently travelling main beam helps the working equipment reach into confined mill interiors during relining operations.
• Low-Profile Lining Trolley: The lining trolley features a low overall height and a high-load-capacity design to support liner transportation along the main beam.
• Hydraulic Working Arm: Hydraulic functions support boom slewing, lifting and luffing, telescoping, and load handling, according to the installed configuration.
• Maintainable Hydraulic and Mechanical Systems: Standardized hydraulic components and an externally arranged hydraulic telescopic element are intended to facilitate inspection and maintenance.
• Established Component Suppliers: The product documentation identifies Siemens and Schneider for electrical control components and SEW for specified drive and traction reducers.

Technical Specifications

Parameter	Specification
Product Type	Mill Liner Handler / Relining Crane
Product Series	JXS
Available Design Evolution	Type I to Type V
Primary Applications	Ball Mill and SAG Mill Liner Replacement
Documented Feed Opening Requirement	Larger than 1.1 m; confirm for the selected configuration
Travelling Options	Rail-Mounted or Rail-Less
Rail-Mounted Configuration	Customized according to site track gauge
Rail-Less Travelling System	Steel wheels with high-strength polyurethane coverings and hydraulic motor drive
Main Beam	Travelling Mechanism
Liner Transportation	Dedicated Lining Trolley
Working Mechanism	Hydraulic Boom and Crane System
Electrical Control Components	Siemens and Schneider, as specified in the product documentation
Drive Components	SEW reducers for specified mechanisms

Note: The feed-opening requirement and component details are based on the available product documentation. The lining trolley section also refers to an opening diameter of at least 1.2 m; the applicable minimum opening should therefore be confirmed for the selected configuration. Rated handling capacity, working reach, mill compatibility, hydraulic pressure, impact force, and other model-specific values require confirmation from the approved technical specifications.

Working Principle

The Mill Liner Handler uses its travelling system, main beam travelling mechanism, hydraulic working arm, and lining trolley to support liner replacement operations inside large grinding mills.

The main travelling system positions the equipment at the designated maintenance location. In the standard configuration, the machine travels on rails laid according to the site track gauge. Where specified, a rail-less system uses hydraulically driven wheels to move across suitable paved surfaces.

The main beam travelling mechanism then advances the working equipment into the mill’s confined interior. The hydraulic working arm provides the required slewing, lifting, luffing, and telescoping movements to reach the designated working position. Depending on the installed attachments, the crane system can handle liners, while the lining trolley supports their transportation along the main beam.

For seized liner bolts, a compatible impact tool can be used to assist with removal. The hydraulic system supplies power to the relevant mechanisms and controls their movements through hydraulic valves.

The precise operating sequence depends on the mill layout, liner arrangement, equipment configuration, and site maintenance procedures.

Applications

The Mill Liner Handler is designed for industrial facilities that operate large grinding mills and require periodic liner replacement and maintenance.

• Mining Operations: Supporting liner replacement in grinding mills used in ore processing.
• Mineral Processing Plants: Assisting with maintenance of ball mills and SAG mills.
• Metallurgical Facilities: Handling mill liners during scheduled equipment maintenance.
• Building Materials Industry: Supporting relining operations in compatible large grinding mills.
• Confined Mill Maintenance Areas: Using the main beam travelling mechanism and hydraulic working arm to access designated positions within the mill.
• Seized Liner Bolt Removal: Assisting with difficult bolt removal when the machine is fitted with compatible impact tooling.

OEM & Customization

Chunhua develops Mill Liner Handler configurations according to the dimensions of the grinding mill, maintenance access conditions, liner handling requirements, and site layout.

Available design considerations include rail-mounted or rail-less travelling, site-specific rail gauge, main beam travelling arrangements, lining trolley configuration, hydraulic working arm movements, lifting attachments, and electrical control components.

To evaluate a suitable configuration, customers should provide the mill type, feed-opening dimensions, internal mill dimensions, liner weight and dimensions, required working reach, site access conditions, and preferred travelling arrangement.

The final equipment configuration and handling capacity should be confirmed through project-specific technical review to ensure compatibility with the mill and the intended relining procedure.

FAQ

1. What types of mills can the JXS Mill Liner Handler service?

The JXS series is designed for liner replacement in ball mills and semi-autogenous mills. Compatibility depends on the mill dimensions, feed opening, liner arrangement, and selected equipment configuration.

2. What feed-opening size is required?

The product documentation states that the equipment is suitable for mills with feed openings larger than 1.1 m. It also specifies that the lining trolley can pass through openings with a diameter of at least 1.2 m. The actual minimum opening should be confirmed for the selected model and configuration.

3. Can the Mill Liner Handler operate without rails?

Yes. The documented design offers a rail-less option using steel wheels with high-strength polyurethane coverings and hydraulic motor drive. The travelling surface must be suitable for the equipment, and the required manoeuvring space should be assessed before installation.

4. Can the equipment assist with removing seized liner bolts?

Yes, when equipped with a compatible hydraulic impact mechanism or bolt-removal tooling. The appropriate tool must be selected according to the bolt specifications and the mill maintenance requirements.

5. Can the Mill Liner Handler be customized for a specific mill?

Yes. The equipment is designed according to the mill’s dimensions and site conditions. Customization considerations include travelling arrangement, rail gauge, main beam configuration, working reach, lining trolley, and hydraulic working mechanisms.

Inquiry CTA

Looking for a Mill Liner Handler for Your Ball Mill or SAG Mill?

Contact Chunhua to discuss your mill dimensions, liner replacement requirements, feed-opening size, and maintenance conditions. Our team can help evaluate a suitable JXS Mill Liner Handler configuration for your application.

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