摘要:
A self-erecting crane includes a mast supporting a foldable jib having jib elements articulated together, configurable between a transport configuration and a work configuration. The crane also includes a motor-driven folding/unfolding system for performing configuration change operations implementing kinematics of folding and unfolding the jib, and a control/command system connected to the motor-driven folding/unfolding system to drive it. One or several inclinometer(s) are mounted on one or several jib element(s) to measure actual inclinations of the jib element(s) with respect to a reference axis. The control/command system is configured to drive the motor-driven folding/unfolding system according to the actual inclinations of the jib element(s) during the kinematics of folding and unfolding the jib.
摘要:
An automated collapsible tower crane comprising a mast with telescopic portions, a boom with boom sections articulated with each other by respective rotary joints, a boom folding system to unfold and fold the boom by the rotary joints wherein each proximal and distal rotary joint is associated with at least one hydraulic actuator to unfold and fold boom sections, a mast folding system to fold the mast down, wherein in the transport position the boom sections are folded down one on top of the other and on the mast, and the boom folding and unfolding system acts independently of the folding and telescoping system of the mast, and comprises hydraulic actuators to fold and unfold the boom sections.
摘要:
Provided is a crane assembling method which can easily assemble a crane. In the crane assembling method, a step of connecting an (n+1)th partial jib includes the steps of: placing a distal end of an nth partial jib connected to a boom on a pedestal on the ground; connecting an upper side connector on a proximal end of the (n+1)th partial jib to an upper side connector on the distal end of the nth partial jib in a state where the (n+1)th partial jib is lifted; mounting a wheel on the lower side connector on a distal end of the (n+1)th partial jib; and connecting a lower side connector of the nth partial jib and a lower side connector on a proximal end of the (n+1)th partial jib to each other by lifting the nth partial jib.
摘要:
A lifting unit includes a jib foot forming a proximal part of a jib in a service configuration, a counter jib supporting a balancing ballast, a securing part between the jib foot and the counter jib to secure the lifting unit to a mast, and a cylinder connected to the jib foot such that the jib foot is movable between a lowered position and a lifted position. A second cylinder is connected to the securing part.
摘要:
Disclosed is a technique of executing: a fixing step of coupling a pulling-raising rope 171 to a vicinity of a distal end 73 of a strut 70; a first raising step of pulling the pulling-raising rope 171 rearwardly to cause a swingable portion 78 of the strut 70 to swing upwardly and rearwardly; a second raising step of pulling the pulling-raising rope 171 rearwardly until a strut body portion 76 has a rearwardly inclined posture with respect to a vertical direction; a strut returning step of pulling a pulling-returning rope 23a forwardly to a position where a forward swinging movement of the swingable portion 78 with respect to the strut body portion 76 is restricted; and a coupling step of coupling the swingable portion 78 and the strut body portion 76 to each other in a non-swingable manner.
摘要:
A multi-component lattice mast section comprises a longitudinal axis, a plurality of chord elements extending along the longitudinal axis, a plurality of connection bars interconnecting in each case two adjacent chord elements, a lattice mast cross-sectional surface area with a lattice mast width and a lattice mast height, the lattice mast cross-sectional surface area being oriented perpendicular to the longitudinal axis, and at least two detachably interconnectable lattice mast assemblies, with each of the lattice mast assemblies having a lattice mast assembly width smaller than the lattice mast width and/or a lattice mast assembly height smaller than the lattice mast height, and with the connection bars being firmly connection to a chord element in a working arrangement.
摘要:
A mobile crane is configured so that a boom is raised by a derrick cylinder in response to a raise signal output from a derrick lever and the derrick cylinder is stopped in response to the derrick angle of the boom reaching the maximum angle γ corresponding to the hoisted-down length of a rope.
摘要:
The invention concerns a collapsible boom, such as a crane jib, concrete pump, camera support, searchlight mast and similar narrow far-projecting structures with several elements (10, 20, 30 . . . ), tiltable around parallel axes, which can be tilted around the axis by actuators (15, 13, 25, 23, . . . ) and fixed in at least one position.The invention is characterized by the fact that the individual elements (10, 20, 30 . . . ) of the boom are hinged to each other via intermediate pieces (50, 60, 70) and the actuators (15, 13, 25, 23, . . . ) engage on one end on an intermediate piece and on the other end on its adjacent element.
摘要:
The automatic leveling and synchronization system for raising and lowering a counterweight includes at least a primary and secondary cylinder connected in series hydraulic communication. The primary cylinder includes a first rod connected to a first piston, and the first rod is attached to one end of a counterweight. The secondary cylinder includes a second rod connected to a second piston, and the second rod is attached to another end of the counterweight. A surface area of a bottom of the second piston is set equal to a surface area of a top of the first piston.
摘要:
Two methods of constructing either a metal or wooden framed multi-story building and corresponding apparatus utilized in the construction. Building includes erecting roof frame beams and subsequent floor levels. For a metal framed building, motorized lifting devices are positioned on specific metal bars. Each metal floor frame has corresponding metal lifting bars. Metal post beams are supported by metal assembly brackets of several lengths, including a spacer block during the repositioning of the motorized lifting devices for the next floor level. The metal corner post beams and the motorized lifting device can further be supported during the lifting procedure by a collar and bracket system. The horizontal level of each floor is controlled by a central control system including lasers, laser sensors and a computer. A second embodiment is directed to the building of wood houses to utilize cantilevered metal lifting bar assemblies supported by lifting devices. The lifting bar assemblies have adjustable framing spaces on top for forming one to three joists in a space. The corner and intermediate outside posts can be formed to have a predetermined set of holes for fastening a glass facade for the building. The construction can be aided by the use of a combination building support and work area assembly placed in the ground on the outside of the building.