Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
  • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
  • B01J8/0025—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor by an ascending fluid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
  • B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
  • B65G53/34—Details
  • B65G53/40—Feeding or discharging devices
  • B65G53/46—Gates or sluices, e.g. rotary wheels
  • B65G53/4608—Turnable elements, e.g. rotary wheels with pockets or passages for material
  • B65G53/4625—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow
  • B65G53/4633—Turnable elements, e.g. rotary wheels with pockets or passages for material with axis of turning perpendicular to flow the element having pockets, rotated from charging position to discharging position, i.e. discrete flow
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
  • Y10T29/49982—Coating
  • Y10T29/49984—Coating and casting
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
  • Y10T29/49993—Filling of opening

Definitions

• the invention relates to a wear-resistant coating arrangement in a rotating gate feeder for the feeding of substantially particulate material.
• the gate feeder comprises a housing and a rotor and also an end cap at each end of the housing.
• Detachable liners of this kind are known from GB Patent No. 1 182 992 and GB Patent No. 1 161 204. These detachable wear- resistant linings have the advantage that they can easily be replaced when they are worn out, but they have the disadvantage of having to be manufactured with great precision so as to fit inside the housing. They must therefore be manufactured in steel or another material which can readily be processed, and which thus does not have the same high degree of wear resistance. The requirement of precision means that these linings will also be expensive to manufacture. Moreover, the linings must be attached and locked into place with great care.
• the lining may move relative to the housing whilst the feeder is in operation, thereby increasing the wear rate considerably and the lining may break and cause damage to both the rotor and the housing.
• a wear- resistant coating is provided which is cast directly on to the inner wall of the housing which faces towards the rotor, the housing inner wall functioning as an outer mould and with a purpose-adapted core as the inner mould.
• the wear-resistant coating consists of a large proportion of granular and extremely hard particles which are held together by a castable binder. In this way, a highly wear-resistant surface is obtained which at the same time is rough and provides great through-flow resistance to air containing abrasive particles. In addition to great wear resistance, this solution therefore also provides reduced air leakage through the gap between the surface and the wings of the rotor. This results in reduced wear on the rotor wings.
• the wear-resistant coating By producing the wear-resistant coating in this way, a wear- resistant coating is obtained that is adapted with precision to the interior wall of the housing whilst the wear-resistant surface is adapted to the diameter of the rotor.
• the wear- resistant coating adheres with great strength to the interior wall of the housing and will not be able to fall out even when subjected to great mechanical stress.
• a release coating may be applied at certain points on the interior wall of the housing, prior to the wear-resistant coating being cast in place.
• the release coating weakens the adhesion to the interior wall of the housing. This means that when tools are used, such as a hammer and chisel or similar, the wear-resistant coating will become loosened in certain zones and be released on being broken into pieces .
• the invention also relates to a method for providing a wear- resistant coating of this kind in that the wear-resistant coating is cast directly on to the interior wall of the housing which faces towards the rotor, with the housing functioning as an outer mould and with a purpose-adapted core functioning as an inner mould.
• Figure 1 illustrates the housing with a wear-resistant coating cast in place and the rotor mounted in place.
• Figure 2 is a lateral view of the gate feeder and with wear-resistant coating applied to the end caps.
• FIG 3 illustrates the same as Figure 1, but in this case wear members are embedded in the wear-resistant coating.
• Figure 4 is a lateral view of the gate feeder illustrated in Figure 3, where embedded wear members are also found on the end caps.
• FIG. 5 shows the housing whilst the wear-resistant coating is being cast with the core in place.
• Figure 1 illustrates a gate feeder 1 comprising a housing 2 and a rotor 3. Particulate material is fed in through an inlet opening 4 and fed out with the aid of the rotor 3 through outlet opening 5.
• a wear-resistant coating 6 is disposed on the internal wall 14 of the housing which faces the rotor 3.
• the housing is equipped with a hole 7 through which the moulding compound which forms the wear-resistant coating is poured.
• Figure 2 illustrates end caps 8 which have a wear-resistant coating 9 cast on to the internal surface thereof .
• bearings 10 on which the rotor is mounted and seals 11 which seal against the housing 2.
• wear members 12 are embedded in the moulding compound. These may be in a homogenous (compact) version of the granular material in the moulding compound or other materials of great wear resistance.
• the end caps 8 may similarly be equipped with such wear members 13.
• the interior wall 14 of the housing which faces towards the rotor 3 forms the outer mould for casting the wear-resistant coating 6.
• an especially purpose-adapted core 15 is used as an inner mould. This has the same diameter as the largest diameter of the rotor.
• the surface 19 is very smooth so that the surface 18 of the wear-resistant coating will be a even as possible.
• the core 15 may be in one piece, or may consist of two portions 15a and 15b as shown in Figure 5. This makes the insertion and withdrawal of the core after moulding easier.
• the core portions are held in place in that non- illustrated press means are disposed between the core portions and press these apart from one another against the contact surfaces 16 and 17 on either side of the housing.
• a release coating Prior to casting the coating, a release coating may be applied to certain zones of the inner wall 14 of the housing 2.
• the proportion of such release coating in relation to the part of the inner wall of the housing to which no release coating is applied, may be varied according to how well one would like the wear- resistant coating to adhere to the inner wall of the housing.
• Different types of release coating may also be selected with regard to the adhesive properties thereof.
• wear members 12 In order to embed wear members 12 in the surface of the moulding compound which faces the rotor, wear members may be glued or attached in some other way on to the core prior to the insertion of the core into the housing. During the casting of the wear-resistant surface these will adhere to the moulding compound.
• This adhesion will be greater in strength than the adhesion to the core, such that when the core is withdrawn the wear members will remain in the cast wear- resistant coating.
• the adhesive between the wear members and the core may be of such a nature that the adhesion between the core and the wear members ceases or is reduced when the adhesive is heated or exposed to certain chemicals.
• a wear-resistant coating and wear members may in a similar way be cast on to the end caps, but the process in this case will be far simpler than for the housing as a counter-mould may be used that is completely flat.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Glanulating (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Soil Working Implements (AREA)
• Electroplating Methods And Accessories (AREA)
• Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
• Inorganic Insulating Materials (AREA)
• Manufacture Of Iron (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Air Transport Of Granular Materials (AREA)
• Coating Apparatus (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19896660

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Citations (4)

Family Cites Families (2)

• 1993
  • 1993-12-07 NO NO934452A patent/NO180115C/no not_active IP Right Cessation
• 1994
  • 1994-12-06 US US08/652,497 patent/US5780166A/en not_active Expired - Lifetime
  • 1994-12-06 DE DE69420583T patent/DE69420583T2/de not_active Expired - Lifetime
  • 1994-12-06 DK DK95903464T patent/DK0732970T3/da active
  • 1994-12-06 AT AT95903464T patent/ATE184212T1/de not_active IP Right Cessation
  • 1994-12-06 EP EP95903464A patent/EP0732970B1/en not_active Expired - Lifetime
  • 1994-12-06 WO PCT/NO1994/000195 patent/WO1995015813A1/en active IP Right Grant
  • 1994-12-06 CA CA002177956A patent/CA2177956A1/en not_active Abandoned
  • 1994-12-06 AU AU12507/95A patent/AU1250795A/en not_active Abandoned

Patent Citations (4)

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