A roller conveyor device including a three-line conveyor for conveying objects that form at least three lines extending in a conveying direction. The three-line conveyor includes first conveyor rollers for conveying ones of the objects that form at least one central line of the at least three lines, second conveyor rollers for conveying ones of the objects that form at least one non-central line of the at least three lines, and third conveyor rollers for conveying ones of the objects that form another at least one non-central line of the at least three lines. A rotary shaft of each of the first, second and third conveyor rollers includes a shaft end portion having a projection portion that projects out from a conveying path in a widthwise direction of the conveying path, and the projection portion is to be driven so as to convey the objects in the conveying direction.

A heat treatment system includes heating chambers configured to perform heat treatment on objects to be treated, and a conveyance device configured to load each of the objects to be treated into the heating chambers, unload the object to be treated from the heating chambers, and convey the object to be treated under an oxygen-free atmosphere, wherein the conveyance device includes a cooling device configured to perform cooling treatment on the object to be treated.

An industrial kiln employs a tunnel kiln design. An upper portion of a central high-temperature firing region of a kiln body (1) has an arch structure, and is divided into a rising portion (4), a middle portion (5), and a descending portion (6). The rising portion (4), the middle portion (5), and the descending portion (6) are connected by means of curved surfaces with smooth transitions. A transporting mechanism (2) at a lower portion of the kiln body (1) is parallel to the upper portion. The present invention enables collection of excessive heat in a pre-heating portion and a cooling portion to transfer the same to a high-temperature firing portion, thus reducing a firing time and burning fuels of a high-temperature firing region, lowering a production cost, and protecting the environment by preventing exhaustion of a large amount of hot air.

A method for manufacturing a steel component from a blank is provided. Firstly, a blank is placed in a conveyor system. Then, at least a preselected zone of the blank is preheated while the blank is retained at a predetermined preheating location. Finally, the blank is conveyed through a furnace. A preheating system for heating blanks in a production line is also provided.

A roller conveyor device including a three-line conveyor for conveying objects that form at least three lines extending in a conveying direction. The three-line conveyor includes first conveyor rollers for conveying ones of the objects that form at least one central line of the at least three lines, second conveyor rollers for conveying ones of the objects that form at least one non-central line of the at least three lines, and third conveyor rollers for conveying ones of the objects that form another at least one non-central line of the at least three lines. A rotary shaft of each of the first, second and third conveyor rollers includes a shaft end portion having a projection portion that projects out from a conveying path in a widthwise direction of the conveying path, and the projection portion is to be driven so as to convey the objects in the conveying direction.

A method of adjusting a position of a blank entering a furnace includes measuring a position of a heated blank exiting the furnace, recording one or more offset values from a nominal value of the heated blank exiting the furnace, calculating a revised position of a subsequent blank entering the furnace as a function of the one or more offset values, and adjusting a position of the subsequent blank entering the furnace as a function of the one or more offset values. The position of the heated blank exiting the furnace can be measured with an electronic vision system, a robot can adjust the position of the subsequent blank, and offset value(s) can be an elapsed furnace operation time, a number of heated blanks that have exited the furnace, and a physical dimension between an actual position of the heated blank and the nominal value of the heated blank.

A method of annealing a steel sheet in an annealing furnace, including: supporting and conveying a steel sheet with hearth rolls; and supporting and conveying the steel sheet with a full-ceramic hearth roll as a hearth roll located in an area where a furnace temperature is equal to or higher than 950° C., wherein a main constituent of the full-ceramic hearth roll is silicon nitride with use of an Al—Y-based sintering aid.

A method for manufacturing a steel component from a blank is provided. Firstly, a blank is placed in a conveyor system. Then, at least a preselected zone of the blank is preheated while the blank is retained at a predetermined preheating location. Finally, the blank is conveyed through a furnace. A preheating system for heating blanks in a production line is also provided.

A firing furnace includes a firing furnace main body having an internal passage from an inlet to an outlet, a first heating portion disposed in an upper portion of the internal passage, a second heating portion disposed in a central portion of the internal passage, a third heating portion disposed in a lower portion of the internal passage, a first transporting roller disposed between the first heating portion and the second heating portion, and a second transporting roller disposed between the second heating portion and the third heating portion. A distance between the first heating portion and the second heating portion is greater than a distance between the second heating portion and the third heating portion.

A glass heating furnace is illustrated. Rollers of the glass heating furnace are pivotally connected to a movable frame, and a roller driver of the glass heating furnace controls the rollers to rotate to a direction of an X axis, and a movable frame driver controls the movable frame to displace reciprocatively along a Y axis, such that the rollers displace along the Y axis at the same time. The glass displaces reciprocatively in multiple directions to be heated up more uniformly, which effectively reduces formation of the thermal stress marks on the glass. Since the rollers displace along the Y axis at the same time, the glass on the rollers does not have the displacement of the Y axis in respect to the rollers, such that friction of the displacement of the glass is reduced, which more effectively reduces formation of the thermal stress marks on the glass.