Operating weight
Operating weight is one of the three important parameters of the excavator (engine power, bucket capacity, operating weight)
The operating weight determines the level of the excavator and determines the upper limit of the excavating force of the excavator.
Digging force ≦ m Ì working weight
m: adhesion coefficient between the ground and the track
If the digging force exceeds this limit, in the case of a backhoe, the excavator will slip and be pulled forward, which is very dangerous. In the case of a shovel, the excavator will slip backwards.
Digging force
For digging forces, the digging force is mainly divided into the arm digging force and the bucket digging force.
The action points of the two digging forces are the root of the bucket (the lip of the bucket), but the power is different, the digging force of the arm comes from the arm cylinder; and the digging force of the bucket comes from the bucket cylinder.
Grounding pressure
The magnitude of the grounding specific pressure determines the ground conditions under which the excavator is suitable for operation.
Grounding pressure refers to the pressure exerted by the weight of the machine on the ground and is expressed by the following formula:
Grounding specific pressure = working weight ÷ all contact area with the ground
Track shoe
• It is important to equip the machine with a suitable track shoe. For crawler excavators, the standard for selecting tracks is to use the narrowest track shoes whenever possible.
·Common track type: tooth track plate,
Walking speed and traction
For crawler excavators, walking time is about one-tenth of the total working time.
In general, the two speeds can meet the walking performance of the excavator.
Traction refers to the force generated when the excavator walks, mainly depending on the travel motor of the excavator.
These two walking performance parameters indicate the maneuverability of the excavator's walking and its walking ability. It can be reflected in the samples of various manufacturers.
Gradeability
Gradeability
Climbing ability refers to the ability to climb, downhill, or stop on a solid, flat slope.
Two representations: angle, percentage
improving capability
Lifting capacity refers to the smaller of rated rated lifting capacity or rated hydraulic lifting capacity.
Rated stable lifting capacity: 75% tipping load
Rated hydraulic lifting capacity: 87% hydraulic lifting capacity
Swing speed
The slewing speed is the average maximum speed that can be achieved by a stable slewing when the excavator is idling.
This means that the defined speed of rotation is neither the start-up nor the speed of rotation during braking; that is, the speed of rotation that is not accelerated or decelerated. For general excavation work, when the excavator is operated in the range of 0° to 180°, the swing motor accelerates or decelerates, and when it is turned into the range of 270° to 360°, the swing speed is stabilized.
Therefore, in actual excavation work, the above defined speed of rotation is impractical. That is, the actual swing performance required is the acceleration/deceleration expressed in terms of the swing torque.
Engine power
Gross horsepower refers to the output power measured on the engine flywheel without the consumption of power accessories such as silencers, fans, alternators and air filters.
Net horsepower 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 is mainly from the engine.
Two types of noise: noise measurement at the operator's ear, noise measurement around the machine.
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