Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/02—Skids or tracks for heavy objects
  • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
  • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
  • F27B3/24—Cooling arrangements

Definitions

• the invention relates to a water-cooled transport roller for a roller hearth furnace with a cylindrical base body, thermal insulation on the outer circumference of the base body and a guide tube for cooling water arranged centrally in the base body, the cooling water being able to be fed to the guide tube at one end of the rotatably mounted base body, flowing through the guide tube and after a deflection at the outlet end of the guide tube flows back in an annular space between the guide tube and the base body.
• the guide tube is tapered towards the water inlet-soapy end and held in the base body with the interposition of a spacer.
• the water is supplied by means of a water inlet pipe which is pushed into the tapered connection end of the guide pipe.
• the water flowing back flows between webs of the spacer and emerges from an end opening of a connection element inserted into the base body.
• a deflection head with radial bores is connected, which is clamped on a mandrel.
• the water supply especially the water supply, proves to be the weak point of the known transport roller.
• the built in the basic body for water management Guide tube consists of a thin-walled tube of great length, whose exact alignment in the axis of rotation of the base body cannot always be guaranteed.
• the water inlet tube inserted into the guide tube is exposed to considerable shear stress, which leads to damage to the water inlet tube after a short time.
• Even a brief interruption in the water supply or even a malfunction in the water supply immediately results in irreversible damage to the transport roller due to the high furnace temperatures. The described course of damage occurs suddenly and cannot be foreseen during the operation of the transport roller.
• the object of the invention is to further develop a water-cooled transport roller of the structure described at the outset in such a way that a premature defect in the cooling water supply is largely excluded.
• a shaft is fastened to the base body and has a receptacle for the end of the guide tube on the water inlet side, a central bore aligned with the axis of rotation of the base body for supplying cooling water and drainage channels opening into a water collection chamber for a water pressure flow , and that a water distributor is rotatably connected to the shaft, through which the cooling water can be fed into the central bore and the water return flow can be drawn off from the water collection space.
• the teaching according to the invention starts with the previously described damage analysis of the known embodiment.
• the rotary feedthrough required for the water inlet and outlet is moved out of the area of the guide tube into an assembly consisting of a shaft and a water distributor head.
• the elements of this assembly are massive, precisely machined components. It can be ensured that the connecting elements of the components, which are rotatable relative to one another, are aligned exactly while adhering to narrow tolerances.
• the end of the water-bearing guide tube is fitted in the shaft so that it cannot rotate. Any offset to the axis of rotation of the transport roller and / or a curvature of the guide tube is therefore harmless for the function of the arrangement according to the invention.
• the water distributor head has a water supply pipe which is aligned with the axis of rotation and which engages at its end in a rotatable manner in the central bore of the shaft.
• the shaft has a cylindrical pin which is aligned with the central bore and which passes through a shaft feedthrough of the water distributor head and can be connected to a device for the cooling water supply in a rotatable manner.
• the water distribution head expediently has a blind bore in the longitudinal direction for the water pressure flow, the diameter of which is larger than the outside diameter of the water supply pipe or of the cylinder journal.
• the shaft can be screwed onto the end face of the base body.
• it has a flange which can be fastened to the end face of the base body and a connection end which is fitted into the base body and which centers the shaft on the base body.
• the invention teaches that a spacer with radial webs is arranged at the water outlet end of the guide tube and that a hollow shaft is inserted into the base body, which has a receiving space for the spacer.
• the water emerges axially from the guide tube and is deflected in the receiving space into which the spacer is inserted.
• the hollow shaft can have a shaft extension for connecting a drive device.
• the thermal insulation on the outside of the base body consists of a fiber mat made of high-temperature-resistant inorganic fibers, which is clamped under elastic compression between the base body and an outer tube forming the tread.
• the outer tube is fastened in a manner known per se to webs which are welded onto the base body.
• Suitable fibers are, for example, ceramic fibers, glass fibers and Si0 2 fibers.
• FIG. 1 shows the longitudinal section through a water-cooled transport roller designed according to the invention for a roller hearth furnace
• FIG. 2 shows the end of the transport roller on the cooling water inlet side in an enlarged view compared to FIG. 1, likewise in longitudinal section.
• the basic design of the transport roller shown in the figures consists of a cylindrical base body 1, thermal insulation 2 on the outer circumference of the base body 1 and a guide tube 3 for cooling water arranged centrally in the base body 1.
• the cooling water can be fed to the guide tube 3 at one end of the rotatably mounted base body 1, flows through the guide tube 3 and, after a deflection, flows in one at the outlet-side end of the guide tube
• a shaft 5 is fastened to the base body 1, which has a receptacle for the water inlet end 6 of the guide tube, a central bore 7 aligned with the axis of rotation of the base body 1 for the supply of cooling water and drainage channels 9 opening into a water collection space 8 for a water pressure flow ,
• the drainage channels 9 consist of bores which are arranged concentrically around the central bore 7.
• the water collection space 8 consists of a cylindrical space that is covered by a lid 10 is closed.
• a water distributor head 11 is rotatably connected to the shaft 5, through which the cooling water can be fed into the central bore 7 and the water return flow can be drawn off from the water collection space 8.
• the water distributor head 11 has a water supply pipe 12 that is aligned with the axis of rotation and that engages at its end in a rotatable manner in the central bore 7 of the shaft 5.
• a small gap is expediently set up between the shaft end and the central bore 7, so that a wear-free rotary movement of the water supply pipe 12 relative to the shaft 5 is ensured. Leakage and the associated low backmixing between the water inlet and the hot water return can be tolerated without any problems if the water throughput is adequate.
• a sealing arrangement between the water supply pipe 12 and the central bore 7 should not, however, be excluded.
• the water-distributing head 11 is rotatably supported on the cover, which is designed as a bearing cover with correspondingly machined bearing surfaces.
• the shaft 5 has a flange which can be fastened with screws 15 on the end face of the base body 1 and a connection end which is fitted into the base body 1.
• a spacer 16 with radial webs 17 is arranged at the water outlet end of the guide tube 3.
• a hollow shaft 18 is inserted into the base body 1 and has a receiving space 19 for the spacer.
• the guide tube 3 is rotatably and centered by the spacer 16.
• the hollow shaft 18 can be welded to the base body 1 or flanged to the front side of the base body 1 with screws in a manner corresponding to the shaft 5 on the cooling water inlet side.
• the cooling water emerges from the end face of the guide tube 3 and is deflected in the receiving space 19 of the hollow shaft 18.
• the hollow shaft 18 also has a shaft extension for connecting a drive device.
• the thermal insulation 2 consists of a fiber mat made of high temperature-resistant inorganic fibers, for example ceramic fibers or Si0 2 fibers.
• the fiber mat is clamped under elastic compression between the base body 1 and an outer tube 20 which forms the tread and is composed of tube segments.
• the outer tube 20 or the tube segments are fastened to webs 21, which are welded onto the outside of the base body 1.
• the base body 1 is mounted on sections 22 on both sides of the thermal insulation area.

Applications Claiming Priority (3)

Publications (1)

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ID=7642649

Family Applications (1)

Country Status (6)

Families Citing this family (11)

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• 2000
  • 2000-05-18 DE DE10024556A patent/DE10024556C2/de not_active Expired - Fee Related
• 2001
  • 2001-05-15 WO PCT/EP2001/005516 patent/WO2001088452A1/de not_active Application Discontinuation
  • 2001-05-15 CA CA002409024A patent/CA2409024A1/en not_active Abandoned
  • 2001-05-15 EP EP01955281A patent/EP1285209A1/de not_active Withdrawn
  • 2001-05-15 KR KR1020027015415A patent/KR20030028740A/ko not_active Application Discontinuation
  • 2001-05-15 CN CN01809702A patent/CN1429330A/zh active Pending

Non-Patent Citations (1)

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