Relevant parameters of excavators
Operating Weight
Operating weight is one of the three important parameters of excavator (engine power, bucket capacity, operating weight)[4]
Operating weight determines the level of excavator and the upper limit of excavating force.
Excavation force < m; working weight
M: Adhesion coefficient between ground and crawler
If the excavation force exceeds this limit, in the case of backhoe, the excavator will slip and be pulled forward, which is very dangerous. In the case of a forward shovel, the excavator will slip backwards.
Excavation force
For excavation force, excavation force is mainly divided into arm excavation force and bucket excavation force.
The action points of the two excavation forces are the tooth root of the bucket (the lip of the bucket), but the power is different. The excavation force of the arm comes from the arm cylinder, while the excavation force of the bucket comes from the bucket cylinder.
Excavation force of bucket (2 pieces)
Grounding specific voltage
The grounding specific pressure determines the suitable working ground conditions of excavators. Grounding pressure refers to the pressure produced by the weight of the machine on the ground. It is expressed by the following formula:
Grounding specific pressure = working weight_total contact area with the ground
Trackpad ·
It is important to fit the machine with proper trackpad. For crawler excavators, the criterion for choosing crawler is to use the narrowest crawler board whenever possible. ·
Common caterpillar types: teeth caterpillar board,
Flat track board
Walking speed
For crawler excavators, walking time accounts for about one-tenth of the total working time.
Generally speaking, two-speed excavator can meet the walking performance.
Traction force
Traction force refers to the force produced by the excavator while walking, which mainly depends on the walking motor of the excavator.
These two walking performance parameters show the dynamic flexibility and walking ability of the excavator. It can be reflected in the samples of each manufacturer.
Climbing ability
Climbing ability refers to the ability to climb, descend, or stop on a solid, flat slope.
Two representations: angle, percentage
Enhancing Ability
Lifting capacity refers to the smaller one of rated stable lifting capacity or rated hydraulic lifting capacity.
Rated stable lifting capacity: 75% overturning load
Rated hydraulic lifting capacity: 87% hydraulic lifting capacity
Rotary speed
Rotary speed refers to the average maximum speed that a excavator can achieve when it is idle.
This means that the rotational speed defined is neither the rotational speed at start nor the rotational speed at brake; that is to say, it is not the rotational speed at acceleration or deceleration. For general excavation work, the rotary motor accelerates or decelerates when the excavator works in the range of 0 to 180 and when it moves to the range of 270 to 360 the rotary speed reaches stability.
Therefore, in the actual excavation work, the rotation speed defined above is unrealistic. That is to say, the actual rotation performance required is the acceleration/deceleration expressed by the rotary torque. Engine power
Gross horsepower refers to the output power measured on the engine flywheel without consuming power accessories such as silencers, fans, alternators and air filters.
Effective power refers to the output power measured on the engine flywheel with all power consuming accessories, such as silencers, fans, alternators and air filters.
Noise measurement
Excavator noise mainly comes from the engine.
Two kinds of noise: the noise measurement near the operator's ear and the noise measurement around the machine
