A shut-off system of the present invention includes a straight pipe made of a polyolefin-based material, and a knife gate, wherein: a semicircular arc-shaped first cutting blade is formed on a distal end side of the knife gate to cut open the straight pipe to form a slit-shaped opening; an arc band-shaped sealing portion is formed on a proximal end side of the knife gate to be in contact with cut surfaces of the straight pipe; the knife gate includes a pair of side edge portions that connect the first cutting blade and the sealing portion; the first cutting blade and the side edge portions bite into an inner circumference surface of the straight pipe along the inner circumference surface; the knife gate is formed in a flat plate shape having a first surface and a second surface, extending from the first cutting blade to the sealing portion and between the pair of side edge portions; the opening extends in a circumferential direction on the straight pipe; and the sealing portion extends from one end of the opening to the other end thereof, and extends from the inner circumference surface to an outermost surface, which is on an outermost side, of the straight pipe.

A fixture includes a pipe having a vertical axis that is coaxial with a center of the pipe, a cutting element having a cutting blade, and a jig assembly coupled to the cutting element and arranged to orient the cutting blade at an angular orientation relative to the vertical axis of the pipe. Related methods and components are also provided.

A pipe machining apparatus includes a frame, a tool carrier rotatably coupled hereto and including first and second couplers at first and second coupling locations, a first machining apparatus including a first tool support and a first tool supported thereby, and a second machining apparatus including a bridge member having first and second support members at ends thereof, and a second tool supported by a second tool support on the bridge member. The first and second tools are configured to perform different machining operations. The first tool support is configured to be couplable to the first coupler when the first machining apparatus is used. The first support member is configured to be interchangeably couplable to the first coupler and the second support member is configured to be couplable to the second coupler when the second machining apparatus is used.

A pipe machining apparatus includes a frame, a tool carrier rotatably coupled hereto and including first and second couplers at first and second coupling locations, a first machining apparatus including a first tool support and a first tool supported thereby, and a second machining apparatus including a bridge member having first and second support members at ends thereof, and a second tool supported by a second tool support on the bridge member. The first and second tools are configured to perform different machining operations. The first tool support is configured to be couplable to the first coupler when the first machining apparatus is used. The first support member is configured to be interchangeably couplable to the first coupler and the second support member is configured to be couplable to the second coupler when the second machining apparatus is used.

A tower segment, a tower, a segmentation method, and a wind turbine. The tower segment includes an annular body having two opposite end faces along the axial direction thereof, the annular body being formed by assembling a plurality of tower pieces; and a connecting member configured for connecting the two adjacent tower pieces, the connecting member including a first connecting piece and a second connecting piece that can be detachably connected to each other, wherein the side of the first connecting piece away from the second connecting piece is fixedly connected to an inner annular surface and an outer annular surface of one of the two adjacent tower pieces, and the side of the second connecting piece away from the first connecting piece is fixedly connected to the inner annular surface and the outer annular surface of the other of the two adjacent tower pieces.

A tower segment, a tower, a segmentation method, and a wind turbine. The tower segment includes an annular body having two opposite end faces along the axial direction thereof, the annular body being formed by assembling a plurality of tower pieces; and a connecting member configured for connecting the two adjacent tower pieces, the connecting member including a first connecting piece and a second connecting piece that can be detachably connected to each other, wherein the side of the first connecting piece away from the second connecting piece is fixedly connected to an inner annular surface and an outer annular surface of one of the two adjacent tower pieces, and the side of the second connecting piece away from the first connecting piece is fixedly connected to the inner annular surface and the outer annular surface of the other of the two adjacent tower pieces.

A system for cutting medical tubing sourced from a spool of tubing uses two actuator groups that each reciprocate along a respective track, which are parallel to each other. Each actuator group has a clamp and a cutting tool which have an operative position along a common axis. The tubing is fed along the common axis to be operated on by the actuator groups. A forward actuator group clamps onto the tubing and is then moved along its track, pulling the tubing. A rearward actuator group then clamps onto the tubing and cuts the tubing. While still clamped onto the tubing, the rearward actuator group is moved forward, pulling more tubing, and the actuator group that was forward is moved to the rearward position and the process is repeated iteratively to produce tubing sections cut to the desired length. The tubing is pressurized and kept under pressure to straighten the tubing.

A system for cutting medical tubing sourced from a spool of tubing uses two actuator groups that each reciprocate along a respective track, which are parallel to each other. Each actuator group has a clamp and a cutting tool which have an operative position along a common axis. The tubing is fed along the common axis to be operated on by the actuator groups. A forward actuator group clamps onto the tubing and is then moved along its track, pulling the tubing. A rearward actuator group then clamps onto the tubing and cuts the tubing. While still clamped onto the tubing, the rearward actuator group is moved forward, pulling more tubing, and the actuator group that was forward is moved to the rearward position and the process is repeated iteratively to produce tubing sections cut to the desired length. The tubing is pressurized and kept under pressure to straighten the tubing.

A blade-replaceable cutting tool includes: a first handheld portion; a second handheld portion rotatably connected to the first handheld portion; a cutting structure rotatably connected to the first handheld portion, the cutting structure including a blade mounting plate rotatably mounted to the first handheld portion and a blade detachably mounted to the blade mounting plate; and a locking mechanism configured to lock the blade on the blade mounting plate when in contact with the blade, and to unlock the blade when separated from the blade, so that the blade can be detached from the blade mounting plate.

A blade-replaceable cutting tool includes: a first handheld portion; a second handheld portion rotatably connected to the first handheld portion; a cutting structure rotatably connected to the first handheld portion, the cutting structure including a blade mounting plate rotatably mounted to the first handheld portion and a blade detachably mounted to the blade mounting plate; and a locking mechanism configured to lock the blade on the blade mounting plate when in contact with the blade, and to unlock the blade when separated from the blade, so that the blade can be detached from the blade mounting plate.