Hitachi Construction Machinery Co., Ltd.

Hiroshi Tsukui

Kazuhiro Ichimura

Yukihiro Tatsuno

Makoto Oota

Yuuichi Todokoro

Hidetoshi Satake

Yoichi Iihoshi

Kenji Mizutani

Hiroshi Onoue

Hiroshi Kumagai

Tomonori Mamada

Tomokatsu Tomiyama

Yasuhiro Kurumisawa

Kouichirou Ejiri

Akira Nakata

Kouji Otani

The invention of the present application has an object of providing a mine management system capable of separately sensing an abnormality of a powertrain system and a load amount sensor of a mine dump truck. For this purpose, a mine management system for managing mine dump trucks operating in a mine includes a processing device that calculates and totalizes a productivity index of the mine dump trucks, in which the processing device: calculates consumed energy of the mine dump truck on the basis of at least a vehicle velocity of the mine dump truck, a road surface gradient, and a load amount; calculates input energy of the mine dump truck on the basis of at least one of a fuel injection amount, trolley electric power, and battery electric power of the mine dump truck; and determines presence or absence of an abnormality of a load amount sensor or a powertrain system of the mine dump truck on the basis of the consumed energy and the input energy.

Mine management system

A lower traveling structure () having front wheels () and rear wheels () provided on a chassis () extending in a front and rear direction, an upper revolving structure () rotatably mounted on the chassis (), and a working mechanism () provided on a front side of the upper revolving structure () and at an intermediate position in a left and right direction are provided. On the other hand, a towing through hole (J,K) bored through an upper side position on both left and right sides and in a front and rear direction and used for mounting a cable in towing is provided on a front attachment mounting plate () provided on a front side position of the chassis () constituting the upper revolving structure (). Moreover, a reflecting member () located inside in the left and right direction of the lower traveling structure () from the position of the towing through hole (J,K) and in the vicinity of the towing through hole (J,K) and reflecting ambient light is provided on a rear surface (B) of the attachment mounting plate ().

Wheel type working vehicle

An earthmoving apparatus includes an earthmoving blade () extending in the width direction of an undercarriage, a lifting unit () configured to move the earthmoving blade () up and down, and a cover unit () covering the lifting unit (), wherein the earthmoving blade () can be moved by the lifting unit between a grounded position in which the earthmoving blade is in contact with the ground surface and a retracted position in which the earthmoving blade is held highest off the ground surface, while keeping a nearly vertical orientation with respect to the ground surface, the cover unit () includes a sub cover () extending from a location above the lifting unit () toward the earthmoving blade () and a main cover () slidable on the upper surface of the sub cover (), the main cover () is pivotally attached to the earthmoving blade () in such a manner that one end portion of the main cover is nearly in contact with the top surface of the earthmoving blade, and when the earthmoving blade () is in the grounded position, the other end portion of the main cover overlaps with the sub cover ().

Earthmoving apparatus for construction machine

Mounted on a revolving frame are onboard equipments including engine and heat exchanger. These onboard equipments are accommodated in a housing cover consisted by including a front partition panel. The front partition panel is fixed to a seat screw member which is provided on the revolving frame. At this time, lower end portion of the front partition panel is hung in a floated state above the revolving frame by a stopper which is adapted rest on an upper end portion of the seat screw member. Therefore, lower end portion of the front partition panel is hung in a floated state above a upper surface of a left side frame, facilitating to align a bolt through hole in the front partition panel with a nut of the seat screw member at the time of threading and tightening a bolt into the nut.

Construction machine

A hydraulic circuit includes a control valve that controls flow of pressure oil from a hydraulic source to work hydraulic cylinders, an operating device that issues a command for drive of the control valve, valve devices each comprising a check valve, each provided in correspondence to one of the plurality of work hydraulic cylinders to allow and prohibit outflow of pressure oil from a work hydraulic cylinder, a commanding device that outputs a command allowing or a command prohibiting extension/contraction for each of the work hydraulic cylinders and a control device that controls each of the valve devices to allow outflow of pressure oil from the work hydraulic cylinder by invalidating a check valve function in response to the command for allowing extension/contraction and to prohibit outflow of pressure oil from the work hydraulic cylinder with the check valve in response to the command for prohibiting extension/contraction.

Hydraulic circuit in work vehicle

The wheeled work vehicle according to the present invention has a link that links at least either one of the axles and provided at the front and the rear of the vehicle to a body, suspension hydraulic cylinders provided at the left side and the right side of the chassis to link the axle to the body in conjunction with the link and an accumulator that is made to communicate with oil chambers and of the hydraulic cylinders via restrictors.

Wheeled type working vehicle

The wheeled work vehicle according to the present invention comprises a link that links at least either one of axles and &prime; provided at the front and the rear of the vehicle to a body , suspension hydraulic cylinders provided at the left side and the right side of the chassis to link the axle to the body in conjunction with the link and an accumulator that is made to communicate with oil chambers and of the hydraulic cylinders via restrictors and

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Abiko, Japan

Hiroshi Tsukui