Characteristics of tunnel lining trolley walking system
The tunnel lining trolley walking system, also known as the walking device, refers to the general name of the mechanisms and parts that ensure driving, support the car body, and reduce the bumping and vibration of the lining trolley on various ground driving. It consists of two parts: track propulsion device and suspension device. Its weight accounts for 16% to 27% of the total weight of the vehicle.
The lining trolley crawler propulsion device is in contact with the ground to convert the force output by the transmission device into the traction force that drives the vehicle, and the suspension device can reduce the impact and vibration generated during the driving process and transmitted to the vehicle body.
There are two types of walking systems: wheeled and crawler. The driving wheels of the wheeled driving device interact with the ground to produce traction to drive the vehicle. Wheeled lining trolleys usually use all-wheel drive. Non-all-wheel drive vehicles also have driven wheels that support the weight of the vehicle. The tracked propulsion device generally includes a driving wheel, a track, a load wheel, an induction wheel with a tensioning device, and a carrier wheel.
The driving wheel wraps the crawler to make it act on the ground to produce traction, and the load-bearing wheel supports the weight of the vehicle and presses the crawler firmly on the ground, so that the crawler and the ground have a larger contact area to produce greater adhesion, and at the same time The movement of the track becomes rolling of the road wheel, which improves the driving efficiency.
The suspension device is installed between the car body and the ground-contacting wheels, and includes elastic elements, damping elements and related control and connection parts. Wheeled linings are now mostly used for independent suspensions where cylindrical coil springs and cylindrical hydraulic shock absorbers are juxtaposed. Torsion bar springs, or swing cylinder type oil-gas springs are also used as elastic elements. Balanced or independent suspensions equipped with vane springs, scroll springs, and cylindrical coil springs have been used in tracked lining trolleys, all of which have been eliminated due to large space occupation, heavy weight, poor buffering capacity, and poor reliability.
Modern tunnel lining trolleys are mostly used for independent suspensions with high-strength torsion bar springs and shock absorbers in parallel, and those with adjustable oil-air suspensions or hybrid suspensions have greatly improved suspension performance and reliability.