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A- SEATBELT | B- CRANE | C- WHEELBASE | D- EVALUATION | E- SEAT BASE | F- CONVEYING | G- PROCESS | H- TESTING | |||||
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Knuckle boom cranes vary greatly in lifting capacity and require a vehicle with a suitable chassis in order to supply sufficient longitudinal bending and lateral torsional rigidity to support the crane in all its operating conditions. Note that all cranes and equipment must be operated within the manufacturer’s limits and capacities.
This particular crane is “rear mounted” and
other configurations may be required such as behind the cab, termed
“forward-mounted”.
In addition to crane manufacturer’s fitting
guide-lines and requirements, many vehicle manufacturers have
specific considerations in terms of allowable stresses that are
imposed on the chassis frame. All these details are taken into
consideration in the design of the vehicle sub-frame which transmits
all imposed loadings and provides the required torsional and general
bending stiffness required.
In general the cranes themselves have built-in hydraulic support arms which extend laterally to the required distance to support local tendency of the truck to tip. In conjunction with a suitably designed sub-frame, additional stabiliser arms may be required at the opposite end of the vehicle to assist in providing torsional stiffness and prevent the vehicle from tipping over. Therefore initial design is critical to avoid the awkward situation of having to “re-work the truck” later.
Other factors which provide a challenge for material selection include the finished vehicle deck height. Many customers have strict height requirements which often necessitate special configurations with medium or high performance material grades.
This crane installation required two sets of certification. The first was vehicle certification : “Heavy Vehicle Specialist Certification” (done by a Heavy Vehicle Certifier) for the mounting of the crane to the vehicle with the associated sub-frame. This takes the form of the issue of an LT400 certificate.
The second was certification of the vehicle stability for Occupational Health and Saftey (O.S.H.) purposes. (Generally performed by a Chartered Professional Engineer or similarly recognised individual). This involves a physical test of the completed installation where the crane is loaded to its rated capacity and then taken through its rated working volume.
The picture shows a medium-to-heavy capacity knuckle boom crane fitted to an 8X4 truck.
Contact Thomas Egineers Ltd if you have any general or special design and certification requirements for knuckle boom crane mounting. Proficient and skilful design ability as well as experience enables us to address your requirements entirely.
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