Performance of crawler excavator walking system

Performance of crawler excavator walking system

The following principles should be followed when designing the walking system of a hydraulic excavator:

(1) Satisfy the use performance, the economy is better, and the requirements for overload protection are also required. The machine has good process performance, compact structure and durable. Parts have good practicability and strong wear resistance;

(2) Ensure that there is a certain distance between the bottom end of the walking system and the ground, and there must be certain requirements for off-road performance. The excavator can walk smoothly on any bad road conditions, increasing the practicability of the machine;

(3) The reliability is better, the grounding specific pressure of the excavator should be smaller, the damage to the ground should be reduced, and the traction generated by the crawler belt should be large, so that the excavator can run smoothly. When the excavator is climbing, it is necessary to ensure the stability;

(4) The structure is compact and the anti-seismic performance is good. On the premise of meeting the technological requirements, the appearance of the excavator is neat and beautiful; combined with the requirements of this design, the total weight of the fuselage and the reference model, select the H-shaped, combined walking frame.

The crawler excavator walking system is mainly the chassis and excavator chassis components, such as: track rollers, carrier rollers, tracks Chain, idlers, loose rings,sprockets, Tracks Chains, track Links, track shoes, rollers, other components

After standardization, the excavator walking system has completed the mass production of products. Therefore, the selection of models in the design should refer to the national construction machinery industry standards. The coordination and cooperation of the “four wheels and one belt” must be selected according to the specified standards to ensure normal operation. and collocation. This is the focus of this structure.

As a basic part, the walking system is not only the load-bearing part of the overall construction machinery, but also the core of walking and rotation, so it is particularly important to grasp the performance, strength and practicality of the whole machine. Among them, the fatigue strength and carrying capacity of the frame, the wear resistance of the track, the meshing between the track and the driving wheel, and the carrying capacity of the rollers will all be the difficulties of this design. Preliminary model selection, design verification, error discovery, and correction, the whole process will be the only way to design, and it is also the focus and difficulty.

The speed of the crawler excavator traveling device is often not high during operation and driving, almost below 5km/h. Its support performance requirements and the satisfaction of walking performance must be studied in depth. The specific steps are:

(1) First select the relevant parameters of the “four wheels and one belt” and its accessories, and arrange the structure of the hydraulic excavator walking system;

(2) Calculate driving resistance, ground pressure, traction, and other parameters;

(3) Design the transmission scheme of the walking drive device, determine the power parameters such as the transmission ratio, and determine the main parameters of the walking hydraulic motor, including power and torque. Verify, check the design parameters, and finalize the design.