A tree harvesting head for a tree harvesting machine, wherein the tree harvesting head comprises at least one cutting device, at least two feed wheels and a radar device. The radar device comprises at least one radar transmitter antenna arranged to transmit a signal to a tree trunk to be measured, at least two radar receiver antennas arranged to receive a radar signal reflected in at least a first and a second location in response to the transmitted radar signal, wherein the first and second locations are different locations. The radar device further comprises means for obtaining characteristics related to the tree trunk based on the signal(s) reflected at the first and second locations. The means for obtaining characteristics related to the tree trunk is arranged to determine a tree trunk signature of a tree trunk segment located at the first location, to identify the determined tree trunk signature when the tree trunk segment has travelled to the second location and to determine a length of the tree trunk based thereon.

A tree harvesting head for a tree harvesting machine, wherein the tree harvesting head comprises at least one cutting device, at least two feed wheels and a radar device. The radar device comprises at least one radar transmitter antenna arranged to transmit a signal to a tree trunk to be measured, at least two radar receiver antennas arranged to receive a radar signal reflected in at least a first and a second location in response to the transmitted radar signal, wherein the first and second locations are different locations. The radar device further comprises means for obtaining characteristics related to the tree trunk based on the signal(s) reflected at the first and second locations. The means for obtaining characteristics related to the tree trunk is arranged to determine a tree trunk signature of a tree trunk segment located at the first location, to identify the determined tree trunk signature when the tree trunk segment has travelled to the second location and to determine a length of the tree trunk based thereon.

Sensor systems for communications between heavy equipment machines during tree felling operations. A system includes a first heavy equipment comprising a first winch and a second heavy equipment comprising a second winch. The system includes a first cable attached to the first winch and a fulcrum roller and a second cable attached to the second winch and the fulcrum roller. The system is such that the first heavy equipment communicates with the second heavy equipment by way of long-range radio signals.

Sensor systems for communications between heavy equipment machines during tree felling operations. A system includes a first heavy equipment comprising a first winch and a second heavy equipment comprising a second winch. The system includes a first cable attached to the first winch and a fulcrum roller and a second cable attached to the second winch and the fulcrum roller. The system is such that the first heavy equipment communicates with the second heavy equipment by way of long-range radio signals.

The invention relates to a method and an arrangement for managing and controlling the lifetime of a tree handling system of a forest machine. The tree handling system is activable through the impact of hydraulically powered execution means (7:1-7:n), the method comprises the steps of; obtaining sensor data (13:1-13:n) that represent a current loading (PT) on the tree handling system, determining a current partial damage value (SL, SM, SH), which is deemed to occur on the tree handling system at various loadings (PT) on the tree handling system,

A characteristic of the invention are the steps of; determining a key indicator (Ni:1-Ni:n), which describes a measured value (X) that relates to the operation of the tree handling system (1) and is representative of the risk of partial damage relative to specific reporting about a current running operating state (db:1-db:n) of the tree handling system, comparing at least the current partial damage value (SL, SM, SH) with a normative partial damage value (SLX, SMX, SHX) for a normative operating state (db:1X-db:nX) of the tree handling system corresponding to the key indicator (Ni:1-Ni:n) and determining a change that affects the measured value (X) of the key indicator (Ni:1-Ni:n) in such a manner that the current partial damage value (SL, SM, SH) returns to or approaches a level corresponding to the normative partial damage value (SLX, SMX, SHX) for the key indicator.

The invention relates to a method and an arrangement for managing and controlling the lifetime of a tree handling system of a forest machine. The tree handling system is activable through the impact of hydraulically powered execution means (7:1-7:n), the method comprises the steps of; obtaining sensor data (13:1-13:n) that represent a current loading (PT) on the tree handling system, determining a current partial damage value (SL, SM, SH), which is deemed to occur on the tree handling system at various loadings (PT) on the tree handling system,

A characteristic of the invention are the steps of; determining a key indicator (Ni:1-Ni:n), which describes a measured value (X) that relates to the operation of the tree handling system (1) and is representative of the risk of partial damage relative to specific reporting about a current running operating state (db:1-db:n) of the tree handling system, comparing at least the current partial damage value (SL, SM, SH) with a normative partial damage value (SLX, SMX, SHX) for a normative operating state (db:1X-db:nX) of the tree handling system corresponding to the key indicator (Ni:1-Ni:n) and determining a change that affects the measured value (X) of the key indicator (Ni:1-Ni:n) in such a manner that the current partial damage value (SL, SM, SH) returns to or approaches a level corresponding to the normative partial damage value (SLX, SMX, SHX) for the key indicator.

A multi-process machine suspension device is equipped with two hydraulic cylinders for rotating the machine relative to an arm supporting it. One cylinder is pivoted to another arm and the other cylinder to the machine frame. Both cylinders are pivoted by one end to a freely rotating intermediate arm pivoted to the same frame joint as the arm supporting it.

A multi-process machine suspension device is equipped with two hydraulic cylinders for rotating the machine relative to an arm supporting it. One cylinder is pivoted to another arm and the other cylinder to the machine frame. Both cylinders are pivoted by one end to a freely rotating intermediate arm pivoted to the same frame joint as the arm supporting it.

A device is mounted to the end of a log so that a skid steer may use the log to engage a tree targeted for felling. The device may include any number of implements configured for engaging the target tree to be felled in such a way that the implement will not “slip” up the tree or off the tree, thereby giving the operator of the heavy equipment some level of control over the target tree. In some applications, the operator of the heavy equipment may simply use the device to push the target tree over such that the root ball of the target tree rises up out of the ground as the target tree is felled. In other applications, an operator may make cuts to the target tree before the heavy equipment pushes the tree with the device implement in the desired direction of fell.

A device is mounted to the end of a log so that a skid steer may use the log to engage a tree targeted for felling. The device may include any number of implements configured for engaging the target tree to be felled in such a way that the implement will not “slip” up the tree or off the tree, thereby giving the operator of the heavy equipment some level of control over the target tree. In some applications, the operator of the heavy equipment may simply use the device to push the target tree over such that the root ball of the target tree rises up out of the ground as the target tree is felled. In other applications, an operator may make cuts to the target tree before the heavy equipment pushes the tree with the device implement in the desired direction of fell.