Information monitor (TFT Compartment Monitor 18.5")
The product was designed to be an info point that can be used indoors or outdoors in stand-alone mode or embedded in the outer walls of carriages on transport vehicles, trams/trains or at railway stations.
Product requirements
The starting requirements for product development were as follows:
- Achieve IP 65 sealing rating
- Ensure modularity of the structure for different uses (from 15″ to 29″)
- Resistance to specific vibration levels typical of rail vehicles
- Dissipation of the heat generated by the control boards and the fanless power supply
- Grounding of the mechanical case to protect the electronics against static electricity
- Minimal design with a clean impact
- Monitor thickness less than 32 mm
- Weight within xxx to ensure lightness of on-board train equipment
Protection against external agents and compact design
The application required an IP65 sealing rating and protection against the ingress of dust and liquids.
- No visible mechanical fixing point on the front; therefore, a clean monitor with only a glass surface visible. A solution that also served to satisfy the requirement of maintaining a clean and minimal design.
- In order to keep the dimensions of the structure within the maximum allowed thickness, the electronics part that deals with power supply and control of the display was remotely located in a dedicated casing on the back of the structure.
Modularity
- The infrastructure part of the frame was made with 2 extrusion dies for the side and corner parts. The mechanical coupling between the corner and side parts with variable lengths made it possible to make the case modular according to the size of the display in different contexts of use.
- The back cover was the only part made of steel to ensure structural rigidity as it also incorporated the attachment points of the entire display to the wall or installation bracket.
- The attachment points on the cover were made using bushings manufactured ad-hoc with CNC lathes and laser-welded around the entire perimeter to ensure a tight seal.
- The mechanical coupling of the rear casing with the extruded profile structure was achieved with specific NYSEAL screws equipped with an under-head seal; a simple and versatile solution that simplifies assembly operations and guarantees repeatability of the seal.
- The front glass was made of rounded extra-clear borosilicate glass with a tempering treatment to meet the IK 20 impact resistance requirement.
- The perimeter was screen-printed in black to highlight only the active part of the display and allow for proper integration of the display.
Resistance to vibrations
The installation of these monitors in the walls of carriages requires the device to withstand defined vibration levels. To achieve a good test seal
The glass was only fixed to the structure with silicone adhesives specially designed for railway applications. The absence of direct contact between structural mechanical parts and the glass ensures better performance at the required vibration levels.
Heat dissipation
The heat dissipation had to be totally passive, without fans.
To ensure the correct functioning of the control and power supply electronics, the housing containing them was made of aluminium from a CNC machined solid body with an externally finned profile. The specific points requiring dissipation were brought into contact with the structure by directly machined thermal bridges.
Materials and technologies used
This system is made up of various materials (aluminium, steel, polyurethane foam seals, PVC, NYSEAL stainless steel screws, toughened glass, silicone adhesives).
The result was achieved using 17 different technologies (extrusion, profile cutting, milling, laser cutting, bending, satin finishing, turning, laser welding, gasket deposition, glass bonding, protection, masking, assembly, anodising treatments, galvanising treatments, painting, screen printing) 9 of which were obtained via our trusted network (extrusion, turning, screen printing, laser welding, anodising and galvanising treatments, painting, gasket deposition and glass bonding)
7 Materials
17 Tecnologies
9 Core processing
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