Tadano Ltd.

Kazuma Mizuki

Shinsuke Kanda

Tomokazu Goto

Tatsuya Yanagisawa

Hiroyuki Hayashi

Yoshimasa Minami

Hiroshi Yamauchi

Shoji Nishimoto

Shohei Nakaoka

Soichiro Fukamachi

Provided is a crane including: an operable function part; an actuator; a generation part; a filter part filtering a first control signal and generating a second control signal; a control part controlling the actuator based on the second control signal; and a computation part computing information relating to a flow quantity estimated as the operable function part moving, if a stop signal has been inputted into the actuator at the present position of the operable function part, from when the stop signal has been inputted into the actuator to when the operation of the operable function part stops. The control part outputs the stop signal to the actuator if information relating to the present position of the operable function part, information relating to a target stop position whereat the operable function part is to be stopped, and the information relating to the flow quantity satisfy prescribed conditions.

Crane and crane control method

A crane includes a boom and a hook suspended from the boom by a wire rope and transports a load in a state in which the load W is suspended from the hook, and further includes a sensor that detects the position of an obstacle, and a control device that generates a transport path CR by arranging a plurality of node points in an area containing a lifting-up point and a lifting-down point of the load and connecting the node points. The control device generates a new transport path after increasing a number of node points arranged around the obstacle when the sensor detects movement of the obstacle.

Crane and path generation system

This crane is provided with: a operable functional part that is supported on a pair of lower bases; a driving device; a detection unit that detects information about the attitude of the operable functional part; a target signal generation unit that generates a target signal regarding the moving direction and the moving speed of a suspended load on the basis of information about an operation input for instructing the moving direction and the moving speed of the suspended load; a filter unit that generates a filtering target signal by filtering the target signal; a control signal generation unit that generates a speed control signal for controlling the operation speed of the driving device on the basis of the information about the attitude and the filtering target signal; and a control unit that controls the driving device on the basis of the speed control signal.

Crane

This crane is provided with: a operable functional unit; an actuator; a generation unit that generates a first control signal including a first deceleration signal section composed of a control signal for decelerating a speed of the operable functional unit from a first speed to a second speed and a first constant-speed signal section composed of a control signal for maintaining the speed of the operable functional unit at the second speed; a filter unit for filtering the first control signal to generate a second control signal; and a control unit that controls the actuator so as to decelerate the operable functional unit based on the second control signal, then controls the actuator so as to maintain the speed at the second speed, and controls the actuator so as to zero the speed when a load has been moved to a location satisfying a prescribed condition.

This crane is provided with: a operable function unit; an operation unit; an actuator; a generation unit which generates a first control signal for the actuator on the basis of an operation input; a plurality of wire ropes; a plurality of hooks suspended from a leading end section of a boom by the plurality of wire ropes, respectively; a hook detection unit which detects, from among the plurality of hooks, an unused hook suspending no load; a calculation unit which calculates a resonance frequency for a wire rope, among the plurality of wire ropes, that suspends the detected unused hook; a filter unit which generates a filter on the basis of the resonance frequency and generates a second control signal by filtering the first control signal using the filter; and a control unit which controls the actuator on the basis of the second control signal.

There is provided a method for controlling a crane, with which the position of a hook is automatically adjusted before lift-off, where a freely-derricking telescopic boom is provided to a swivel base, a main hook is suspended with a main wire rope from a distal end section of the telescopic boom, and a suspended load is suspended on a main hook with slinging wire ropes, wherein post-slinging lift-off is preceded by a hook position adjustment control involving repeating: a first process where the control device controls so as to reel in the main wire rope to a position where the main wire rope is tensed; and a second process where the control device controls so as to move the distal end section of the telescopic boom in the same direction of a horizontal direction component of the movement of the main hook in the first process.

Method for controlling crane, and crane

The resonant frequency &#x3c9;x(n) of horizontal shaking of a suspended load W suspended from the distal end of a telescopic boom 9 via wire ropesis calculated on the basis of the suspension length Lm(n)&#xb7;Ls(n) of the wire ropes; the characteristic frequency &#x3c9;y(n) in the raising and lowering direction of the telescopic boomis calculated; and, in accordance with an operation for raising and lowering the telescopic boomthe filtering control signal Cd(n) of an actuator is generated in which a frequency component in a discretionary frequency range is attenuated at a discretionary ratio with reference to the resonant frequency &#x3c9;x(n) of the suspended load W, and in which a frequency component in a discretionary frequency range is attenuated at a discretionary ratio with reference to the characteristic frequency &#x3c9;y(n) in the raising and lowering direction of the telescopic boom

This crane is provided with: a boom; a wire rope suspended down from a leading end section of the boom; a suspender that is fixed to a lower end of the wire rope and is for suspending a slinging tool for hanging a load; a calculation unit that calculates a first load, which is the weight of a member that is suspended down from the suspender; a slinging tool database unit that stores information pertaining to the slinging tool corresponding to the first load; a determination unit that determines whether a load is being suspended from the suspender; and a control unit that acquires the information pertaining to the slinging tool corresponding to the first load from the slinging tool database unit if the load is being suspended, and sets the vertical length of the slinging tool on the basis of the acquired information pertaining to the slinging tool.

Crane and method for acquiring length of slinging tool

Provided is a crane that is capable of effectively suppressing oscillation related to the pendulum resonance frequency generated in a suspended load on the basis of the suspended length of a wire rope. The cranecalculates a suspended load oscillation resonance frequency &#x3c9;x(n) determined on the basis of the suspended length L(n) of a wire rope (), and generates a control signal C(n) for an actuator according to an arbitrarily defined operation signal, and, on the basis of the resonance frequency &#x3c9;x(n), generates from the control signal C(n) a filtering control signal Cd(n) for the actuator in which a frequency component in an arbitrarily defined frequency range is attenuated by an arbitrarily defined percentage. The frequency range of the attenuated frequency component and/or the percentage of attenuation is altered on the basis of the suspended length L(n) of the wire rope ().

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.

This crane is provided with: a operable functional unit; an operation unit for receiving an operation input for operating the operable functional unit; an actuator that drives the operable functional unit; a first generation unit that generates a first control signal for the actuator on the basis of the operation input; a switch unit that can be switched between a first state and a second state; a first filter unit that filters the first control signal to generate a second control signal when the switch unit is in the second state; and a control unit that controls the actuator on the basis of the first control signal when the switch unit is in the first state, and controls the actuator on the basis of the second control signal when the switch unit is in the second state.

The present invention addresses the problem of providing a crane that can ascertain the state of an area surrounding a hook or a cargo suspended on the hook and that can simultaneously ascertain a braking distance during stopping operations. The invention comprises: drive devices-that move a boom; a control apparatusthat controls the operation state of the drive devices-; a camerathat photographs, from the distal end portion of the boom, an area below said portion; and image display devicesandthat display the image photographed by the camera. For the purpose of stopping the movement of the boom, the control apparatusfilters basic control signals S for the drive devices-to create filtered control signals Sf, controls the drive devices-on the basis of the filtered control signals Sf, estimates the braking distance for the boom, and displays the same on the image display devicesand

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Kagawa, Japan

Kazuma Mizuki