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US 3,941,087 AGranted
Resin coated steel pipe and the process and equipment for its production
OwnerYoshimi Yazakiinventor
Life of this patent
Estimating the term…
Abstract
A resin coated steel pipe is produced by forming the pipe from a band using forming rollers, welding the seam, inserting a paint sprayer which coats an anti-corrosive coating on the inside wall of the pipe, applying an adhesive on the outer surface of the pipe, and applying a layer of the synthetic resin over the adhesive layer. The paint sprayer includes a gun-pipe which protrudes through a stack of ferromagnetic cores, which cores are water-cooled and are used for welding the seam.
Claims8
A device for coating the inner surface of a welded seamed steel pipe during its manufacture, comprising
- a gun-pipe (9) having an elongated pipe portion, a nozzle portion (11) at one end of said pipe portion and a tube at the opposite end of said pipe portion, said tube being adapted to be connected to a source of paint (12);
- an elongated ferromagnetic member having a hollow bore (101), said hollow bore surrounding a portion of said pipe portion with an inner space therebetween to permit the flow of cooling fluid between said pipe portion and said ferromagnetic member;
- a pipe holder (104) having an inflow port and an outflow port, an inlet pipe (21) connected to said inflow port to supply cooling fluid and connected to a source of cooling fluid, an outlet pipe (22) connected to said outflow port to remove the heated cooling fluid;
- a ported pipe (103,1031) having a port (1031), a slide sleeve (106) connected to said ported pipe, said slide sleeve (106) being slidably movable on said gun-pipe pipe portion which protrudes therethrough, a cap member (10), an enclosing electrically insulative casing pipe (105) closed by said cap member (10) at one end and closed by said pipe holder (104) at the opposite end, said casing pipe (105) surrounding said ferromagnetic member (101) with an outer space therebetween for the flow of cooling fluid, and a spring (108) positioned between said cap member and said slide sleeve to exert pressure on said slide sleeve (106) and through said ported pipe on said ferromagnetic member,
- a high frequency induction coil (8) for welding said seamed steel pipe, said coil being connected to a source of high frequency alternating current and positioned outside of and proximate to said electrically insulative casing pipe (105),
- wherein said inflow port is in fluid communication with the outer space between said casing pipe and said pipe portion and said outflow port is in fluid communication with the inner space between said ferromagnetic member and said gun-pipe pipe portion and wherein the gun-pipe protrudes through said cap so that its nozzle portion is within that portion of said steel pipe which has been seamed.
3 more elements
A device for welding and coating the inner surface of a welded seamed steel pipe during its manufacture, comprising
- a casing pipe (105) which is electrically insulative;
- a gun-pipe (9) having an elongated pipe portion, a nozzle portion (11) at one end of said pipe portion and a tube at the opposite end of said pipe portion, said tube being adapted to be connected to a source of paint (12);
- an elongated ferromagnetic member having a hollow bore (101), said hollow bore surrounding a portion of said pipe portion with an inner space therebetween to permit the flow of cooling fluid between said pipe portion and said ferromagnetic member, said casing pipe (105) surrounding said ferromagnetic member (101) with an outer space therebetween for the flow of cooling fluid;
- a high frequency induction coil (8) connected to a source of high frequency alternating current and positioned outside and proximate to said casing pipe;
- a pipe holder (104) having an inflow port and an outflow port, an inlet pipe (21) connected to said inflow port to supply cooling fluid and connected to a source of cooling fluid, an outlet pipe (22) connected to said outflow port to remove the heated cooling fluid and leading to a cooling fluid egress;
- wherein said inflow port is in fluid communication with the outer space between said casing pipe and said pipe portion, said induction coil is proximate the seaming location of said pipe and said nozzle portion is within the seamed pipe.
3 more elements
Dependencies are inferred from the claim text.