Abstract: The present invention relates to the providing of a rolling mill that makes it possible to more accurately control the shape of a plate material than has hitherto been possible, and to a rolling method, and is a rolling mill that rolls a plate material using vertical work rolls, and that includes: a coolant jet spray unit that has a plurality of nozzles that are arranged at predetermined intervals in the direction of the rotation axis of the work rolls, and that sprays jets of coolant from the respective nozzles onto the work rolls; a roll temperature estimation unit that estimates a mean temperature of the work rolls; a coolant temperature detection unit that detects a temperature of the coolant; a shape detection unit that detects the shape in the width direction of the rolled plate material; a shape deviation calculation unit that calculates an amount of deviation between a plate material shape detected by the shape detection unit and a target shape; and a shape control unit that controls the shape of the

Abstract: An upper revolving structure (3) includes a revolving frame (5), a floor member (9) which is provided on the revolving frame (5) and a front side of which serves as a footrest section (11) on which an operator rests his or her feet, a cab box (17) which forms an operating room (18) above the floor member (9), and an indoor unit (23) disposed on the floor member (9) to supply sucked air as conditioned air. A lower surface (11B) side of the footrest section (11) of the floor member (9) is formed as a unit mounting surface (12), and, as for the indoor unit (23), a box body (24) is disposed on the lower side of the unit mounting surface (12) and, in this state, the box body (24) is mounted on the unit mounting surface (12) by means of a plurality of bolts (32).

Abstract: When the actuator drive torque of a hydraulic pump is lower than a switching torque ?0, a controller closes a solenoid switching valve and makes a rotary electric machine function as a generator. With the increase in the actuator drive torque, the controller controls a pressure compensated flow control valve so that the flow rate of hydraulic fluid supplied from the hydraulic pump to a rotary hydraulic device decreases. When the actuator drive torque is higher than the switching torque, the controller opens the solenoid switching valve, makes the rotary electric machine function as an electric motor, and controls the pressure compensated flow control valve so that the hydraulic fluid discharged by the hydraulic pump is not supplied to the rotary hydraulic device. Consequently, shocks due to flow rate fluctuation are prevented when operational states of the rotary hydraulic device and the rotary electric machine are switched.

Abstract: A compact excavator includes an operator's cab with a door capable of opening and closing an opening surface forming a boarding port. The door includes one door piece, and has a flexing portion which is closer to a front pillar than the central portion of the door when the door is in a closed state. The flexing portion is shaped to have a first area so formed that when the door is in a closed state, the first area approaches the opening surface as the first area approaches the front pillar, and a second area arranged continuously with the first area and nearer the front pillar than the first area and being formed so that the second area draws away from the opening surface as the second area approaches the front pillar.

Abstract: A conveying device includes a plurality of conveying rollers supported in parallel at predetermined intervals, and conveys a workpiece to a heat-retaining/heating furnace from a rolling mill by the conveying rollers. The conveying device includes an impact prediction data collecting unit and a control unit. The impact prediction data collecting unit acquires data on the upstream of the heat-retaining/heating furnace. The data is used to predict the magnitude of an impact applied to rollers in the furnace, which are positioned in the heat-retaining/heating furnace, of the conveying rollers by the workpiece. The control unit predicts the magnitude of an impact from the data, which is acquired by the impact prediction data collecting unit, and adjusts the conveying speed of the workpiece in the heat-retaining/heating furnace according to the magnitude of the impact.

Abstract: [Problem] To provide a construction machine with a step arranged in an operator's cab, which makes it possible to enlarge the shape or dimensions of the step without increasing a swing radius. [Solution] In a compact excavator provided with a step that facilitates ingress to and egress from the operator's cab (6), the step is provided at a part thereof with an outwardly-extending edge portion (12a) that extends out beyond an opening plane (16) forming an ingress/egress opening (20), and a door (5) is provided at a part thereof with a convex part (5a) that covers the outwardly-extending edge portion (12a) of the step when the door (5) is in a closed position.

Abstract: A suction duct (19) provided in a floor member (9) comprises an internal air duct portion (20) connected to the internal air inlet port (10A3), an external air duct portion (21) connected to an external air inlet port (10E3), and a common duct portion (22) for connecting the internal air duct portion (20) and the external air duct portion (21) to a blower fan 18B suction side of an air conditioner unit (18). The suction duct is constructed to form a hollow column (23) having a hollow closed section structure with the internal air duct portion and the common duct portion formed integrally in the upper and lower directions. Therefore, the hollow column formed of the hollow closed section structure can increase strength of the floor member as a strong column while circulating internal air between the internal air inlet port and the air conditioner unit.

Abstract: An upper revolving structure is provided on a lower traveling structure, and a floor member and a cab box are provided on a revolving frame of the upper revolving structure. A rear side of the floor member serves as an operator's seat mounting section, and a front side thereof serves as a footrest section, a front side thereof being formed as a lever/pedal mounting section. The footrest section is constituted by a flat operator's seat front plate which is provided on a front side of the operator's seat, a downward plate which is set downward from a left side end portion of the operator's seat front plate on a left side of the cab box, and a flat footstep plate which extends toward a door on which the operator puts his or her foot when getting into or out of an operating room.

Abstract: Provided is a hybrid construction machine capable of facilitating the hybridization (conversion, redesigning, etc. into a hybrid construction machine) even for construction machines of the minimal tail swing radius type or the minimal swing radius type. A hybrid mini-shovel of the minimal tail swing radius type comprises an engine, a hydraulic pump whose input shaft is coaxially connected to the output shaft of the engine, a generator/motor whose rotating shaft is connected to the output shaft of the engine and the input shaft of the hydraulic pump via a gear mechanism, and a battery which receives and supplies electric power from/to the generator/motor. The generator/motor is placed at a vertical position where its lower end is situated above the shaft center of the input shaft of the hydraulic pump, and when viewed from above at a horizontal position where it overlaps with the hydraulic pump.

Abstract: A floor member is formed by a seat support platform on a rear side and a footrest area located on a front side of the seat support platform, and a cab box is formed by a front panel, a rear panel, a left front side panel, a left rear side panel, a right side panel, and a top panel. A right reinforcing panel is provided at a right side position of the floor member and rises upwardly of the footrest area. The right side panel of the cab box corresponding to this right reinforcing panel is provided with a notched portion for avoiding interference with the right reinforcing panel. Accordingly, since the strength at the right side position of the floor member can be enhanced by the right reinforcing panel, it is possible to prevent deformation such as torsion and distortion when the floor member is tilted up.

Abstract: An exhaust gas purification device for an internal combustion engine comprises, an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.

Abstract: A seat support platform (17) is provided on a floor panel (13) of a floor member (12) of a cab (11). An air conditioner unit (25) is installed internally of the seat support platform (17). An under floor duct (27) is provided on the lower side surface (13C) of the floor panel (13) to form an external air induction passage (30) to guide external air from outside of the cab (11) toward an external air intake port (25H) of the air conditioner unit (25). Under floor duct (27) can be provided integrally with the floor member (12) without protrusion to the lower side, and the under floor duct (27) can supply cool external air into the cab (11). Even in the case of a small size hydraulic excavator, the under floor duct (27) can be provided integrally on the floor member (12) to secure broader space in the cab (11).

Abstract: The present invention relates to the providing of a rolling mill that makes it possible to more accurately control the shape of a plate material than has hitherto been possible, and to a rolling method, and is a rolling mill that rolls a plate material using vertical work rolls, and that includes: a coolant jet spray unit that has a plurality of nozzles that are arranged at predetermined intervals in the direction of the rotation axis of the work rolls, and that sprays jets of coolant from the respective nozzles onto the work rolls; a roll temperature estimation unit that estimates a mean temperature of the work rolls; a coolant temperature detection unit that detects a temperature of the coolant; a shape detection unit that detects the shape in the width direction of the rolled plate material; a shape deviation calculation unit that calculates an amount of deviation between a plate material shape detected by the shape detection unit and a target shape; and a shape control unit that controls the shape of the

Abstract: A conveying device includes a plurality of conveying rollers supported in parallel at predetermined intervals, and conveys a workpiece to a heat-retaining/heating furnace from a rolling mill by the conveying rollers. The conveying device includes an impact prediction data collecting unit and a control unit. The impact prediction data collecting unit acquires data on the upstream of the heat-retaining/heating furnace. The data is used to predict the magnitude of an impact applied to rollers in the furnace, which are positioned in the heat-retaining/heating furnace, of the conveying rollers by the workpiece. The control unit predicts the magnitude of an impact from the data, which is acquired by the impact prediction data collecting unit, and adjusts the conveying speed of the workpiece in the heat-retaining/heating furnace according to the magnitude of the impact.

Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.

Abstract: A seat support platform (17) is provided on a floor panel (13) of a floor member (12) of a cab (11). An air conditioner unit (25) is installed internally of the seat support platform (17). An under floor duct (27) is provided on the lower side surface (13C) of the floor panel (13) to form an external air induction passage (30) to guide external air from outside of the cab (11) toward an external air intake port (25H) of the air conditioner unit (25). Under floor duct (27) can be provided integrally with the floor member (12) without protrusion to the lower side, and the under floor duct (27) can supply cool external air into the cab (11). Even in the case of a small size hydraulic excavator, the under floor duct (27) can be provided integrally on the floor member (12) to secure broader space in the cab (11).

Abstract: A folding type door is fitted in a cab box. Two door panels and are disposed substantially in the same vertical plane as a left side cover of an upper revolving structure when said door in a closed position. Catches and are provided in a left rear side section of the cab box. Provided on door panels and of the folding type door are strikers and to be attachably or detachably engaged with the catches and separately of each other. When the folding type door is opened, the respective door panels and are each retained in an open door position by engagement of two sets of strikers and catches and which prevents rattling movements of each door panel to retain the folding type door in a stabilized state.

Abstract: A lower floor panel (20) and an upper floor panel (22) which is having a sunken storage portion (20D) is provided in front of a seat supporting base (12) which supports an operator's seat (16) with in a cab (11). A storage space (24) is provided between a sunken storage portion (20D) in the lower floor panel (20) and a flat horizontal surface (22A) of the upper floor panel (22). This storage space (24) can be used for installation of an air-conditioning unit (25). This lo means that the air-conditioning unit (25) can be accommodated in a floor portion in front of the operator's seat (16), permitting to suppress the height of the cab (11) to an appropriate level. In addition, installation of the air-conditioning unit (25) can make assembling and maintenance work far easier.

Abstract: The exhaust gas purification device of an internal combustion engine of the present invention comprises an exhaust passage for guiding an exhaust gas exhausted from an engine to outside, a catalyst provided in the exhaust passage, an injection path connected on an upstream side of the catalyst in the exhaust passage, an additive injection valve installed in the injection path for supplying an additive to the catalyst through the injection path, and an inflow portion provided in a merging portion where the exhaust passage and the injection path merge for having a part of the exhaust gas flowing in the exhaust passage flow into the injection path.

Abstract: The present invention provides an exhaust gas purification device for an internal combustion engine, comprising an exhaust passage including a catalyst for conveying exhaust gas discharged from the engine to the outside, and a bend formed by bending a portion of the exhaust passage directly upstream of the catalyst, the bend causing exhaust gas discharged from the engine to collide against a corner portion between an inlet end face of the catalyst and such portion of a wall of the exhaust passage that follows the outside of the bend, thereby increasing pressure at the corner portion, compared with the other portion of the inlet end face, and an additive injection valve fitted to the outside of the bend of the exhaust passage to inject an additive in such manner that the injected additive passes just above the corner portion and falls on the inlet end face of the catalytic converter.