The lining trolley is driven by the driving wheel to wind the crawler and cyclically rotate, and it is a mechanism that supports the body. It is composed of crawler walking device and suspension. The lining trolley walking system often adopts the overall trolley traveling system and the balancing trolley traveling system. The walking device of the lining trolley consists of crawlers, driving wheels, supporting wheels, supporting wheels, tensioning wheels and tensioning buffer devices. The engine transmits the torque to the driving wheels through the transmission system, and drives the crawler belt to move in a circular motion, which becomes an infinitely long moving track carried by itself. There are two types of crawler: metal crawler and metal rubber crawler. The most widely used metal crawlers are combined type and integral type.
It is composed of track, driving wheel, supporting wheel, supporting wheel, tensioning wheel and tensioning buffer device. The engine transmits the torque to the driving wheels through the transmission system, and drives the crawler belt to move in a circular motion, which becomes an infinitely long moving track carried by itself. There are two types of crawler: metal crawler and metal rubber crawler. The most widely used metal crawlers are combined type and integral type. The combined track is composed of track section, track shoe, track pin and pin sleeve. Each track shoe is fixed on the track section with bolts, and each track section is connected to each other by a track pin with a pin sleeve. The track shoe can be made of special-shaped steel such as high-quality carbon steel or alloy structural steel. The combined crawler has high rigidity, good sealing performance and long service life, and different types of crawler shoes can be replaced according to needs.
But it is heavy and inconvenient to disassemble and assemble. The track shoes of the monolithic track are mostly cast from wear-resistant alloy steel, and each track shoe is directly connected to each other with track pins, which has a simple structure, light weight, and convenient disassembly and assembly. However, the gap at the pin hole is large, the sand is easy to enter, and the service life is short. The use of bimetallic track pins with chrome steel surface or track pins with rubber bushings can extend the service life. The metal rubber track uses rubber as a connecting piece, and has two types: block type and whole strip type. Each section of steel spurs is integrated with a rubber block or a whole rubber belt. There is no noise when working, and can alleviate the impact, and has a long service life, but the rubber is easy to age.
The supporting wheel is used to transfer the weight of the lining trolley to the crawler belt and play a supporting role; the tension wheel and the tension buffer device are used to guide the crawler belt to move normally and maintain a certain degree of tightness of the crawler belt. When the tension wheel is impacted, it can slide or swing backwards to alleviate the impact, and adopts screw type or hydraulic type tensioning mechanism. The screw type structure is simple, but the adjustment is laborious; the large and medium-sized lining trolley should adopt a hydraulic tensioning mechanism. The role of the supporting roller is to support the crawler, reduce the amount of sag of the crawler, and prevent the crawler from jumping and lateral slippage. Some supporting rollers use rubber rims to reduce noise and prolong service life.
