Abstract: A pipe cutting machine comprises: rotary blades in a pair, with a plane at a right angle to a center line of a pipe, the rotary blades being arranged to face each other on both sides of a y axis in such a manner that blade edges of the rotary blades overlap each other in an x-axis direction; a straightforward driving mechanism that drives the rotary blades straightforward in opposite directions of a y-axis direction so as to make the rotary blades pass each other on the x axis and in the vicinity of the x axis; and power direction conversion mechanisms that move the rotary blades outwardly to get farther from the y axis for avoiding interference between the blade edges when the rotary blades pass each other on the x axis and in the vicinity of the x axis.

Abstract: To provide a pipe cutting machine capable of cutting a pipe even of a large diameter efficiently in a short period of time, and achieving excellent economical efficiency and excellent durability with a simple, compact, and light-weight configuration. A pipe cutting machine cuts a pipe 10 at a right angle to the center line of the pipe 10.

Abstract: In a forming apparatus, inner frames are arranged in a forming roll stand so as to move up and down. Mechanical structures of convexo-concave engagement are provided on opposed faces between respective roll chocks and yokes and the inner frames. After connection with a pressing device is released, the roll chocks and yokes are guided utilizing the moving-downward motion of the inner frames, and a stack body is formed in series so as to be withdrawn from the roll stand. The stack body is disassembled utilizing the moving-upward motion of the inner frames, and the roll chocks and yokes can be guided to the desired positions inside the stand and locked.

Abstract: A squeeze roll stand includes a combination of a fixed portion installed at a joint position of an electric resistance welded pipe manufacturing line, in which squeeze rolls excluding left and right upper rolls are detachably assembled, and a movable portion overlying the fixed portion, inside which left and right upper rolls are detachably assembled, the movable portion being inclined, taking a back surface downstream side as a fulcrum point, toward a same side from an assembling position on the fixed portion to a retreat position to open an upper part of the fixed portion. The movable portion is driven and reciprocated between the assembling position and the retreat position with cylinder type actuators as a drive mechanism. At the retreat position, the movable portion overlies a bead grinding device arranged on the back surface downstream side of the fixed portion with a front surface facing upward.

Abstract: In a Turk's head stand, double inner frames are disposed inside an outer frame. A first inner frame is disposed so as to be adjusted in the vertical direction, and a second inner frame is disposed so as to be adjusted in the horizontal direction. Four-way straightening rolls and position adjusting devices are incorporated inside the second inner frame. Mechanical structures for convexo-concave engagement are disposed on faces of the respective roll chocks and yokes and the inner frames opposed to each other, thereby to guide the respective roll chocks and yokes, by utilizing descending motions of the inner frames, after connection with a pressing device has been released, to form the stack body in series, and to enable the stack body to be withdrawn from the roll stand.

Abstract: A compact tube clamping device for inspecting an electric resistance welded tube quality. A lifting/lowering base including a tube support body is provided onto a fixed base. Clamp claws sandwich the tube support body. A claw drive body lifting/lowering independently of the lifting/lowering base is provided in the lifting/lowering base. Opposite side portions of the claw drive body are connected to opposite clamp claws by links to turn the opposite clamp claws in closing directions by lowering with respect to the lifting/lowering base. A first drive mechanism for the lifting/lowering base and a second drive body for lifting/lowering the claw drive body are provided to the fixed base. A lowering stroke of the claw drive body necessary for closing operations of the clamp claws is partially born by lifting of the lifting/lowering base in transferring the tube, thereby suppressing the lowering stroke of the claw drive body.

Abstract: The present invention provides a compact tube clamping device 50 with a simple structure and used suitably for a hydraulic pressure tester for inspecting quality of an electric resistance welded tube. To achieve this object, a lifting/lowering base 52 including a tube support body 55 on itself is provided onto a fixed base 51 to be able to lift and lower. Clamp claws 56 are mounted in positions, between which the tube support body 55 of the lifting/lowering base 52 is sandwiched, to be able to turn. A claw drive body 58 for lifting and lowering independently of the lifting/lowering base 52 is provided in the lifting/lowering base 52. Opposite side portions of the claw drive body 58 are connected to the opposite clamp claws 56 by links 59 so as to turn the opposite clamp claws 56 in closing directions by lowering with respect to the lifting/lowering base 52.

Abstract: A squeeze roll stand includes a combination of a fixed portion installed at a joint position of an electric resistance welded pipe manufacturing line, in which squeeze rolls excluding left and right upper rolls are detachably assembled, and a movable portion overlying the fixed portion, inside which left and right upper rolls are detachably assembled, the movable portion being inclined, taking a back surface downstream side as a fulcrum point, toward a same side from an assembling position on the fixed portion to a retreat position to open an upper part of the fixed portion. The movable portion is driven and reciprocated between the assembling position and the retreat position with cylinder type actuators as a drive mechanism. At the retreat position, the movable portion overlies a bead grinding device arranged on the back surface downstream side of the fixed portion with a front surface facing upward.

Abstract: In a forming apparatus, inner frames are arranged in a forming roll stand so as to move up and down. Mechanical structures of convexo-concave engagement are provided on opposed faces between respective roll chocks and yokes and the inner frames. After connection with a pressing device is released, the roll chocks and yokes are guided utilizing the moving-downward motion of the inner frames, and a stack body is formed in series so as to be withdrawn from the roll stand. The stack body is disassembled utilizing the moving-upward motion of the inner frames, and the roll chocks and yokes can be guided to the desired positions inside the stand and locked.

Abstract: In a Turk's head stand, double inner frames are disposed inside an outer frame. A first inner frame is disposed so as to be adjusted in the vertical direction, and a second inner frame is disposed so as to be adjusted in the horizontal direction. Four-way straightening rolls and position adjusting devices are incorporated inside the second inner frame. Mechanical structures for convexo-concave engagement are disposed on faces of the respective roll chocks and yokes and the inner frames opposed to each other, thereby to guide the respective roll chocks and yokes, by utilizing descending motions of the inner frames, after connection with a pressing device has been released, to form the stack body in series, and to enable the stack body to be withdrawn from the roll stand.

Abstract: An electrostatic particle precipitator for removing dust particles from a flue gas. The precipitator includes a plurality of collecting electrodes in the shape of plates mounted on endless chains and moving between a first region through which flue gas to be treated flows and a second region where the flow of gas is extremely scarce. A dust removal mechanism is positioned in the second region to remove dust which accumulates on the electrode plates. The moving speed of the collecting electrodes is controlled within a certain range to maintain a prescribed thickness of dust on the electrodes whereby the ocurrence of reverse ionization phenomenon is prevented.