The method of calculating the hydraulic cylinder parameters of a telescopic boom manipulator for the forest industry use

The effective performance of work on shore warehouses and raids for round timber loading and unloading depends on the correct choice of a manipulator. For this type of operation the manipulator must be mobile, reliable in operation and highly-producing. To provide the manipulator with these operational qualities, a hydraulic manipulator boom was developed, the main feature of which is a reduced length in the transport position due to the maximum retraction of the retractable section into the inner cavity of the support section. The boom consists of a support section, a sliding section and a hydraulic cylinder of the drive of the retractable section. One end of the support section has an eye for mounting to the support and rotary device of the base machine, on the section lower face there is an eye for attaching the lifting hydraulic cylinder. The sliding section has an eye for fixing the handle on one end and on its lower face there is an eye for attaching the hydraulic cylinder of the handle drive. The sliding section enters the hole of the support section with the end made in the form of a hole. The hydraulic cylinder of the drive of the sliding section is installed in the inner cavity of the support section. Sliding guides are located between the contacting faces of the support section and the sliding section. The authors describe the method of calculating the parameters of a hydraulic cylinder that performs the function of extending the sliding section from the free cavity of the support section and retracting the sliding section into the free cavity of the support section. They take into account all external and internal resistances that arise during the operation of the hydraulic manipulator boom, depending on its angle of inclination during operations. To justify the parameters of the hydraulic cylinder special attention is paid to calculation of the minimum permissible internal diameter of the cylinder and the minimum permissible diameter of the rod and to their compliance with the requirements. The selection of the hydraulic cylinder according to the presented method will ensure the reliable manipulator performance due to the improved boom design of the hydraulic manipulator.