Tunnelling and construction sector equipment are exposed to extreme environmental conditions. In this context, the seals of components such as slewing rings and large bearings are essential to ensure their performance and durability.



For more than 30 years now, PXL SEALS has been outfitting suppliers of equipment for these applications and has developed a specific seal, the PXL Jumbo seal, to meet these challenges.

1.The constraints of seals for TBM and construction

These applications involve stringent demands on sealing systems because the slewing rings and large bearings present in equipment such as TBM (Tunnel Boring Machines), cranes and turrets undergo:

• Continuous vibrations which can affect the alignment of the parts,


• Substantial temperature and humidity variations,


• Abrasive environments such as dust and mineral residues,


• Substantial eccentricity which results from oscillating movements or slow rotation.

These conditions require seals that can maintain lubrication while preventing the infiltration of foreign bodies.

Moreover, the durability of the materials is crucial in order to minimize the maintenance work at sites that are often difficult to access.

2. The PXL Jumbo seal, a rapidly available, customized solution

The PEROBAT Jumbo seal was developed for applications that require low pressure seals combined with slow rotating movements, constraints which are specific to large bearings.

Its characteristics make it an ideal solution for the demanding environments of tunnelling, the mining industry and public works:

• Adapted to slow or oscillating rotating movements, the Jumbo seal can be adapted to variations of section and the eccentricity of parts, without compromising on the sealing,


• Designed with high-performance materials selected for specific conditions (temperature, contact with fluids, low pressure),


• Exceptional durability: entirely molded seals with narrow tolerances compared with other means of processing to ensure maximum compatibility.

Seals available within very short time frames

The systems available in our production facilities allow us to handle a wide range of requests and to make entirely molded parts, with diameters of up to several meters. Our manufacturing times range from several weeks for standard orders to very short deadlines of 1 to 3 weeks.

Here are some examples of standard sections:

* Diameters in mm

More info about large bearing seals

Download the JUMBO seal technical information sheet

Other dimensions are available, please contact us for further information.

3. Use of the Jumbo seal: different type of assemblies/configurations

The PXL Jumbo seal can be used in different assemblies as a function of the exterior environment and the level of safety required.

Here are some examples of assemblies of Jumbo profiles. The PXL SEALS team is at your service for advice and technical studies for your equipment.

• Mounting of a single seal

• Mounting of two seals in tandem

• Sealing in two opposing directions

 

Design, on-site services and work

Beyond the manufacturing of Jumbo seals, PXL SEALS accompanies its clients each step of the way in order to ensure optimal sealing:

• Technical on site expertise: our teams can come to you to evaluate the specific constraints and to offer adapted solutions. 


• Design and technical studies: with its 30 years of experience and its design department, PXL SEALS can also design customized sealing solutions. 


• Installation and maintenance: the seals can be molded or replaced directly on site, throughout the world, thanks to our on-site molding and bonding techniques.

PXL SEALS offers an innovative technique, the MD Way method, which involves molding seals directly on-site without needing to dismantle the equipment. This approach reduces downtime and optimizes costs.

Jumbo seals are a good example of PXL SEALS’s expertise and know-how in addressing the specific constraints of large bearings.

Their performance, combined with the customized services which we offer, make them the obvious choice to ensure the reliability and durability of equipment for the tunnelling and construction industry.

Contact us for further information.

Tags : tunnelling, TBM, sealing for construction, sealing systems, seals