AS ISO 7451:2021 – Earth-moving machinery -Volumetric ratings for hoe-type and grab-type buckets of hydraulic excavators and backhoe loaders
AS ISO 7451:2021 – Earth-moving machinery -Volumetric ratings for hoe-type and grab-type buckets of hydraulic excavators and backhoe loaders.
AS ISO 7451 specifies a method for estimating the volume of materials which a hoe- type or grab-type bucket of a hydraulic excavator or backhoe loader can normally contain. The volume assessments are based on the internal dimensions of the bucket and on the representative volumes at the top of the bucket.
The method employs the technique of dividing the complex shape of the material in the bucket into simple geometric shapes.
This method of assessment is intended to provide a conventional means of comparing bucket capacities. It is not intended to be used to define true capacities.
This International Standard is not applicable to buckets of cable excavators.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
sell-propelled machine on crawlers, wheels or legs, having an upper structure capable of a 3600 swing with mounted equipment and which is primarily designed for excavating with a bucket, without movement of the undercarriage during the work cycle
Note ito entry: An excavator work cycle normally comprises excavating, elevating, swinging and discharging of material.
Note 2 to entry: An excavator can also be used for object or material handling/transportation.
Note 3 to entry: For hoe-type bucket components (see Eigitre_2).
Note 4 to entry: Adapted from ISO 6165: 2006.
self-propelled crawler or wheeled machine having a main frame designed to carry both front-mounted equipment and rear-mounted backhoe equipment (normally with outriggers or stabilizers)
Note Ito entry: When used in the backhoe ritode, the machine Is stationary and normally digs below ground level. Note 2 to entry: When used In the loader mode (bucket use), the machine loads through forward motion. Note 3 to entry: A backhoe work cycle normally comprises excavating, elevating, swinging and discharging of material. A loader work cycle normally comprises Filling, elevating, transporting and discharging of material. ISOURCE: ISO 6165:2006, definition 4.3]
distance between the cutting edge (or face) of the leading edge and the contact edge of the strike plane
on the backsheet of a hoe-type bucket (see Figtue3)
maximum depth of the indentation, perpendicular to the strike plane, on a hoe-type bucket (see Figure 4)
(hoe-type bucket) horizontal plane extending over the width of the bucket from the cutting edge or face of the leading edge to the contact edge between the horizontal plane and the backsheet (see Figure 3)
(grab-type bucket) horizontal plane extending over the width of the bucket and passing through the top edges of the backbands (see Figure 12)
cylindrical surface of radius R on the hoe-type bucket, which traverses the edges of the strike plane (face ol the leading edge and contact edge of the backsheet) and which is tangential to a plane parallel to the strike plane and at a distance V (see Figure 4)
area of a hoe-type bucket’s side internal surface bordered by the strike plane (see Figure H)
area ola hoe-type bucket’s side Internal surface bordered by the strike surface (see Figure 9)
area ola grab-type bucket’s side internal surface bordered by the strike plane (see Figure 12)
area of a grab-type bucket’s side internal surface used for calculating top volume (see Figure 13)
volume lying beneath the strike plane or the strike surface
volume of material situated above the strike plane
volume of material inside the grab-type bucket displaced by the operating mechanism or structure
volume determined by the method detailed in this International Standard, providing a means of comparing the capacities of buckets.