The present invention provides an automatic container landing device based on an expert system and a control method therefor. The device comprises at least four groups of cameras and at least six groups of single-point laser devices, wherein the at least four groups of cameras and four groups of single-point laser devices in the at least six groups of single-point laser devices are arranged at four spreader corners of a spreader fixing support; two groups of single-point laser devices in the at least six groups of single-point laser devices are respectively arranged on the outer sides of two short edges of the spreader fixing support; the front end of the spreader fixing support is lower than the rear end of the spreader fixing support; and the first group of cameras and the second group of cameras in the at least four groups of cameras, as well as the first group of laser devices and the second group of laser devices, and the third group of cameras and the fourth group of cameras, as well as the third group of laser devices and the fourth group of laser devices, are arranged at the front end and the rear end of the spreader fixing support respectively. According to the automatic container landing device based on the expert system, manual container landing experience is integrated into various sensors, a spreader is controlled by means of sensing signals, low-point and high-point container landing of a container is conducted, automatic dynamic container landing of the container is achieved, high-precision measurement is achieved with the cooperation of the cameras and the single-point laser devices, and therefore, the precision and efficiency of the container landing operation are improved.

A tower crane includes a tower on which a rotating portion is pivotally mounted and configurable between a service configuration in which the rotating portion can be rotatably driven by a motorized orientation system, and an out of service configuration in which the rotating portion is rotatably released to be able to be oriented in the direction of the wind. A control/command unit activates a monitoring mode in the out of service configuration to detect, depending on variations in the angle of orientation or the angular speed of the rotating portion, if the rotating portion is in one of the following movement states: an autorotation state corresponding to a rotary movement of the rotating portion in a given direction over at least one complete turn; or an oscillation state corresponding to a back and forth movement of the rotating portion about the orientation axis.

A tower crane includes a tower on which a rotating portion is pivotally mounted and configurable between a service configuration in which the rotating portion can be rotatably driven by a motorized orientation system, and an out of service configuration in which the rotating portion is rotatably released to be able to be oriented in the direction of the wind. A control/command unit activates a monitoring mode in the out of service configuration to detect, depending on variations in the angle of orientation or the angular speed of the rotating portion, if the rotating portion is in one of the following movement states: an autorotation state corresponding to a rotary movement of the rotating portion in a given direction over at least one complete turn; or an oscillation state corresponding to a back and forth movement of the rotating portion about the orientation axis.

One variation for a system for tracking lifting events at a construction site includes: a chassis configured to couple to a crane block of a crane at a construction site. The system further includes a first idler assembly including a first cable idler, a first idler arm, and a first position sensor coupled to the first idler arm. The first idler arm supports the first cable idler on a first side of the chassis and biases the first cable idler inwardly toward a first cable loop coupled to the crane block. Additionally, the system includes a controller configured to, during a lift event: read a first position value from the first position sensor; predict a weight of the load carried by the crane block based on the first position value; and generate a lift event record containing the weight of the load carried by the crane block.

A crane calculates the resonance frequency of the fluctuation of a suspended load determined from the hanging length of a main wire rope or a sub wire rope, generates a control signal for actuators, in accordance with the operation of a turning operation tool, a hoisting operation tool and the like, and generates a filtering control signal for the actuators in which a frequency component in any frequency range has been attenuated from the control signal at any ratio in reference to the resonance frequency. When the actuators are controlled by the operation of the respective operation tool and when the actuators are controlled regardless of the operation of the respective operation tool, the frequency range to be attenuated and the attenuation ratio are switched to different settings.

A crane creates a 3D map on the basis of three-dimensional information acquired by a three-dimensional information obtaining section that is provided on a boom. The three-dimensional information obtaining section: is configured to be capable of accumulating acquired three-dimensional information and to be capable of changing a measurement direction, a measurement range, and a measurement density; and creates the 3D map by superimposing accumulated three-dimensional information. When an operation signal for a swivel operation for a swivel base, a hoisting operation for the boom, or an extension/retraction operation for the boom has been detected, on the basis of the movement direction and movement speed of the boom as calculated from a detected value for the operation signal, the three-dimensional information obtaining section: changes the measurement direction; and narrows the measurement range and increases the measurement density as compared to when the operation signal has not been detected.

In this boom slewing angle detection device, a slewing angle detecting gear is attached to an end of a shaft of a pinion gear that meshes with a ring gear formed on a slewing bearing rotatably supporting a crane boom, and the amount of rotation of the slewing angle detecting gear is detected by a slewing-angle-detecting proximity sensor. The slewing angle detecting gear is not meshed with the ring gear or the pinion gear, which compose a slewing force transmission mechanism; thus, grease, and the like, do not adhere to the slewing angle detecting gear, and external teeth for detection of the slewing angle detecting gear are not subject to wear, so accurate slewing angle detection is possible.

An obstacle detection device detects an obstacle existing in one or more monitoring areas that are set to correspond to a movable part. A state determination unit determines whether a state of the actuator is a standby state or a suspended state under circumstances where the actuator is at a stop. On determination that the state of the actuator is the standby state, a display control unit executes automatic image output that is processing for causing a display device to display a monitoring image corresponding to a monitoring area in which the obstacle is detected out of the one or more monitoring areas. On determination that the state of the actuator is the suspended state, the display control unit stops the execution of the automatic image output.

An obstacle detection device detects an obstacle existing in one or more monitoring areas that are set to correspond to a movable part. A state determination unit determines whether a state of the actuator is a standby state or a suspended state under circumstances where the actuator is at a stop. On determination that the state of the actuator is the standby state, a display control unit executes automatic image output that is processing for causing a display device to display a monitoring image corresponding to a monitoring area in which the obstacle is detected out of the one or more monitoring areas. On determination that the state of the actuator is the suspended state, the display control unit stops the execution of the automatic image output.

A lift machine includes a machine chassis, a boom extending from the machine chassis, and a connector extending from the boom for coupling to a load. The machine further includes a control system that determines a lift capacity of the machine based on a skew of the connector caused by the load.