Kobelco Cranes Co., Ltd.

Kobe Steel, Ltd.

Kobelco Construction Machinery Co., Ltd.

Kabushiki Kaisha Kobe Seiko Sho (kobe Steel, Ltd.)

Kabushiki Kaisha Kobe Seiko Sho

Koichi Shimomura

Hiroaki Kawai

Shintaro Sasai

Takashi Hiekata

Toshiro Yamashita

Naoto Hori

Akira Tsutsui

Keisuke Fukumoto

Osamu Toudou

Koji Inoue

Tetsuya Ogawa

Takahiro Kobayashi

Takahiro Hanamoto

Hitoshi Sakurai

Hideaki Ishihara

Toshiki Tsurumi

Masaaki Ehara

Jumpei Yamada

An electric winch device includes a required braking force estimation section which estimates a required braking force required to stop a free-falling object at a position at an allowable stopping height; a braking force determination section which determines, out of an operational braking force, each of a first braking force to be borne by a braking device and a second braking force to be borne by a braking force which is generated in an electric motor due to consumption of regenerative power; and a control section which causes the braking device to apply the first braking force to a winch drum. The braking force determination section determines the first braking force to be a braking force equal to or greater than the required braking force when, at a time of stopping of the free-falling object, the operational braking force is equal to or greater than the required braking force.

Electric winch device

Provided is an electric winch device including: an electric motor; a winch drum; a brake; an operation lever; and a controller. The controller includes: a first torque derivation unit which derives a value of a first torque applied to the winch drum due to a load of an object; a second torque derivation unit which derives a value of a second torque generated in the winch drum by a drive torque of the electric motor; and a brake control unit which determines a timing for releasing a braking action on the winch drum after the operation lever has been operated, on the basis of a differential between the second torque value and the first torque value, and which causes the brake to release the braking action on the winch drum by transmitting, to the brake, a control signal instructing release of the braking action on the winch drum at the determined timing.

An electric winch device including an electric motor that rotates a winch drum in a hoisting direction, and generates regenerative electric power when a rotation of the winch drum in a lowering direction is transmitted to the electric motor, a transmission device that transmits the rotation between the electric motor and the winch drum, a power calculating section that calculates power of the target object by freefall, and a control section that controls an operation of the transmission device. When the power calculated by the power calculating section exceeds reference electric power, the control section causes the transmission device to change the transmission rate of the rotation to a transmission rate at which the regenerative electric power generated by the electric motor is equal to or smaller than the reference electric power.

A crane includes an overload safety device and a identifying unit. The overload safety device includes a maximum-load calculating unit configured to calculate a maximum load that a winch drum is capable of winding up with driving torques output from the remaining electric motors other than a failed electric motor identified by the identifying unit, an updating unit configured to update a set hoisting ability value stored in a storing unit to a value equal to the maximum load, and a control unit configured to cause the remaining electric motors to operate when a value of a load derived by a load deriving unit is equal to or smaller than a latest set hoisting ability value stored in the storing unit and stop the operation of the plurality of electric motors when the value of the load derived by the load deriving unit exceeds the latest set hoisting ability value.

Crane

An exhaust gas purification control device includes an engine, an actuator using the engine as a driving source, an operation unit used by an operator to operate the actuator or the engine, an operation detector detecting whether or not the operation unit is being operated, a purification device for capturing soot in exhaust gas of the engine, an accumulation amount detector detecting an accumulation amount of the soot captured by the purification device, a regeneration unit for performing an regenerating operation of regenerating the purification device by burning the soot captured by the purification device, and a controller controlling the regenerating operation. The controller switches a control from a control of prioritizing an operation by the operation unit to a control of prioritizing the regenerating operation in a stepwise manner as the accumulation amount of the soot detected by the accumulation amount detector increases.

Exhaust gas purification control device for construction machine

An operating machine includes: a charging time estimation unit that estimates a first estimated charging time required to restore a capacity of a first battery from a first estimated residual capacity to a target capacity value of the first battery and a second estimated charging time required to restore a capacity of a second battery from a second estimated residual capacity to a target capacity value of the second battery; a capacity management implementation unit that implements capacity management on the first battery and the second battery such that the first battery is charged for the first estimated charging time and the second battery is charged for the second estimated charging time; and a discharge amount limitation unit for limiting a discharge amount of the second battery during an idling stop so that a residual capacity of the second battery after discharge is maintained at or above a set value.

Operating machine

A slewing stop control apparatus and method, capable of executing, while performing the control of determining the target slewing velocity based on a remaining slewing angle from the actual slewing motion position up to the slewing stop angular position, an automatic control of re-slewing the slewing structure having been stopped before the slewing stop angular position. The apparatus executes slewing angular velocity control for deciding the slewing braking start timing to stop the stewing structure at a slewing stop angular position in accordance with a predetermined slewing deceleration and the subsequent target slewing angular velocity, based on the remaining slewing angle of the slewing structure. When the slewing structure stops before the slewing stop angular position due to disturbance despite the foregoing control, the target slewing angular velocity is corrected to be increased for generating slewing torque to restart the slewing.

Slewing stop control apparatus and method for slewing type working machine

Provided is a braking control apparatus for a slewing type working machine capable of giving a braking operation easily intuitively grasped. This apparatus includes: a flow control valve actuator increasing an opening of a flow control valve between a slewing hydraulic motor and a hydraulic pump according to an operation amount of a slewing operation member; pressure control valves limiting respective maximums of an inlet and outlet pressures of the hydraulic motor to a set value corresponding to a pressure command signal to be input; a motor-side pressure controller which retains a set pressure of the motor inlet sided pressure control valve to a pressure for motor driving and lets a set pressure of the motor outlet side pressure control valve be a set pressure for a braking torque corresponding to an operation amount of a braking operation member other than the slewing operation member; and a valve opening limiter reducing the opening of the flow control valve in correspondence with the operation of the braking operation member.

Braking control apparatus for slewing type working machine

A traveling crane according to the present invention includes a hook hoisting guide sheave for guiding a hook hoisting rope from the top of a boom toward the end of a jib, and the hook hoisting guide sheave is arranged on the top of the boom in a state that the guide sheave can guide the hook hoisting rope along the upper surface of the boom by folding the rope toward an upper spreader placed at a position adjacent to a boom anchor during assembling/disassembling of the crane. Thereby, the upper spreader can be moved between the boom anchor and a far end of the boom without providing a guide sheave dedicated for moving the upper spreader. Pairs of support legs are downward provided on both sides and in front and in rear of the upper spreader and a roller is provided for each support leg, so that interference between the upper spreader during movement and obstacles on the boom upper surface can be prevented even in a horizontal movement system excellent in operating efficiency.

Traveling crane and assembling/disassembling method thereof

A weight detecting apparatus for a crane includes a base machine comprising a lower traveling body and an upper rotating body; weights mounted on this base machine; ID (identification) tags which are installed on the respective weights and in which ID information on weight mounting conditions has been written; and an ID reader for reading the ID information. In this weight detecting apparatus weight detecting apparatus, the mounting conditions of the weights are detected by wireless communications between the ID reader and the ID tags.

Weight detecting apparatus for crane and crane having the same

According to a control device for a hydraulic winch, a regulator controls a motor capacity of a hydraulic motor having variable capacity functioning as a driving source of the hydraulic winch in response to a load pressure, a negative brake stops and retains the hydraulic motor at an automatic shutoff for prevention of overloading, and a controller sends signals to the regulator via a regulator-controlling valve at the automatic shutoff to set the motor capacity at a large value. Thus, the delay to recover the motor capacity at the time of returning from the automatic shutoff that is activated during winding-up of a load does not occur, and a control response is increased.

Growing community of inventors

Akashi, Japan

Koichi Shimomura