EP0522521A1 - Dispositif pour le chargement d'un four de traitement thermique de petits articles métalliques - Google Patents

Dispositif pour le chargement d'un four de traitement thermique de petits articles métalliques Download PDF

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Publication number
EP0522521A1
EP0522521A1 EP92111560A EP92111560A EP0522521A1 EP 0522521 A1 EP0522521 A1 EP 0522521A1 EP 92111560 A EP92111560 A EP 92111560A EP 92111560 A EP92111560 A EP 92111560A EP 0522521 A1 EP0522521 A1 EP 0522521A1
Authority
EP
European Patent Office
Prior art keywords
lock
shield
feeding device
furnace
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92111560A
Other languages
German (de)
English (en)
Other versions
EP0522521B1 (fr
Inventor
Werner Schulte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wolfgang Kohnle Warmebehandlungsanlagen GmbH
Original Assignee
Wolfgang Kohnle Warmebehandlungsanlagen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wolfgang Kohnle Warmebehandlungsanlagen GmbH filed Critical Wolfgang Kohnle Warmebehandlungsanlagen GmbH
Publication of EP0522521A1 publication Critical patent/EP0522521A1/fr
Application granted granted Critical
Publication of EP0522521B1 publication Critical patent/EP0522521B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material

Definitions

  • the invention is based on a loading device with the features specified in the preamble of claim 1.
  • the disadvantage here is that the loading device has a large overall height and that the various falling processes can lead to damage or deformation of the metal parts, especially since the metal parts have not yet hardened. Damage or deformation cannot be accepted, especially with metal parts that are intended for later automatic assembly.
  • the present invention has for its object to provide a loading device of the type mentioned, which has a lower height and are less likely to damage or deformation due to a fall of the metal parts.
  • the new charging device is characterized by the fact that the lock, the scale and the shield, transfer area for the metal parts from the lock to the area surrounding the entrance to the gas-tight shielded flow chamber, are integrated into a compact unit.
  • the scale is no longer a device separate from the lock and located in front of the lock; rather, the lock itself is mounted on a force measuring device, preferably on an arrangement of at least two load cells, and has thereby become part of the weighing device. This completely eliminates the need for a falling process compared to the prior art: metal parts which in the prior art fell from the bunker or from some kind of loading device into the weighing container and after the weighing process fell into the lock now only fall into the lock, since this is also the weighing container.
  • the lock can yield to the weight of the metal parts and act on the force measuring device, it is inserted into the shielding by means of a flexible membrane, which surrounds the transfer area from the lock to the entrance to the furnace.
  • the best way to run in this shield is a vibrating trough, which picks up the metal parts coming out of the lock and transports them directly into the furnace on the conveyor belt there, which passes through the pass-through chamber.
  • the flexible membrane between the shield and the lock ensures that the vibrations of the vibration channel are essentially not transmitted to the lock and thus to the force measuring device and the weighing result distort.
  • the lower end of the lock should be as low as possible above the bottom of the shield.
  • the lock is therefore preferably immersed in the shield and has an inclined bottom, the deepest point of which lies close to the bottom of the shield or close to the bottom of the vibrating trough;
  • a flap is expediently provided, which pivots upwards from the deepest point of the floor, so that the metal parts can slide off over the sloping floor of the lock.
  • Another possibility is to design the sloping bottom of the lock itself as a flap and to articulate the flap so that when the lock is opened the angle of inclination of the flap is increased with respect to the horizontal. In this case, the metal parts can slide over the opened flap. In both cases, the parts are protected by sliding over an inclined surface.
  • the membrane fulfills a multiple function: it uncouples the weight of the metal parts lying on the vibrating trough from the force measuring device, it dampens the transmission of vibrations from the vibrating trough to the force measuring device and it ensures a gas-tight connection between the lock and the shield.
  • the membrane In order to be able to fulfill this task, the membrane must be flexible, gas-tight and heat-resistant according to the temperatures that occur be. Membranes made of thin spring sheet are suitable, especially those which are corrugated. Another possibility is the use of a gas-tight, flexible, heat-resistant cloth, which is expediently coated with polytetrafluoroethylene. Because the membrane is continuously exposed to vibrations, it is a wearing part. It is therefore preferably screwed gas-tight with the help of circumferential flanges on the one hand to the lock and on the other hand to the shielding and can therefore be replaced if necessary after loosening the flange screw connections.
  • the loading device shown in Figures 1 and 2 contains a conveyor trough 1, which comes from a storage bunker for small parts to be treated made of metal.
  • Conveyor trough 1 can be a vibrating trough.
  • an oblique slide could also be provided, which can be temporarily closed by a flap.
  • the conveyor trough 1 opens above a lock 3, which can be closed at the top by an inlet flap 2.
  • the lock is welded with its peripheral wall 10 into a cover 11 of a shield 12, which is supported by two load cells 7 on a support device 8 fixed to the frame.
  • the lid 11 closes the lower part 13 of the shield, which is designed as a vibration channel.
  • the rear part of the vibrating trough 13 shown on the left is mounted on a supporting device 14 with a rubber buffer 14a so that it can vibrate, whereas the front part of the vibrating trough, which is completely closed, leads directly into the gas-tight flow chamber of a heat treatment furnace and in front of it - if it is a longer vibrating trough - additionally supported on steel springs.
  • the cover 11 is not flanged directly to the vibrating trough 13, but via a flexible, gas-tight membrane 5, which has a flange 15 of the cover on the one hand and a flange 16 of the vibration trough on the other hand screwed gas-tight.
  • the sluice 3 has a sloping flap 4 as the bottom, which opens downwards by increasing its angle of inclination relative to the horizontal until it strikes the bottom 6 of the vibrating trough 13 in an inclined position.
  • the charging device conveys a predetermined amount of small metal parts per unit of time, characterized by their target weight, via the vibrating trough 13 into the heat treatment furnace, the flow chamber of which is shielded on the input side by the shield 12, so that protective or reaction gas contained in the flow chamber is not to the outside and air does not penetrate the flow chamber. If the lock is empty, after closing the outlet flap 4, the inlet flap 2 is opened and the conveyor trough 1 is put into operation, which now conveys metal parts that fall into the lock 3. In the meantime, the weight of the lock and its contents are continuously measured by means of the load cells 7.
  • the load cells are connected to an evaluation circuit (weighing circuit), to which the target weight to be achieved can be specified.
  • the conveyor trough 1 is put out of operation and the inlet flap 2 is closed.
  • the lock is then rinsed.
  • the combustible protective or reaction gas of the furnace with the penetrated atmospheric oxygen can burn out in the lock.
  • the outlet flap 4 of the lock is opened so that the metal parts can slide over this flap 4 onto the bottom 6 of the vibrating trough 13, specifically in the conveying direction 9.
  • the outlet flap 4 can be closed again and a new weighing process can be started.
  • the second exemplary embodiment differs from the first exemplary embodiment in that the lock 3 plunges into the vibrating channel 13 almost to the bottom thereof. Therefore, the metal parts can no longer be released from the lock 3 by opening the bottom 4 into the vibration channel. Instead, an outlet flap 17 is now provided on the peripheral wall 10 of the lock pointing in the direction of conveyance, which opens upwards. With this arrangement of the lock 3, a particularly gentle release of the weighed metal parts into the vibration channel 13 is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Jigging Conveyors (AREA)
  • Tunnel Furnaces (AREA)
EP92111560A 1991-07-11 1992-07-08 Dispositif pour le chargement d'un four de traitement thermique de petits articles métalliques Expired - Lifetime EP0522521B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9108520U 1991-07-11
DE9108520U DE9108520U1 (de) 1991-07-11 1991-07-11 Beschickungsvorrichtung eines Ofens für das Wärmebehandeln von Kleinteilen aus Metall

Publications (2)

Publication Number Publication Date
EP0522521A1 true EP0522521A1 (fr) 1993-01-13
EP0522521B1 EP0522521B1 (fr) 1995-03-08

Family

ID=6869161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111560A Expired - Lifetime EP0522521B1 (fr) 1991-07-11 1992-07-08 Dispositif pour le chargement d'un four de traitement thermique de petits articles métalliques

Country Status (2)

Country Link
EP (1) EP0522521B1 (fr)
DE (2) DE9108520U1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638125A (en) * 1948-03-20 1950-05-31 Stead & Company Ltd J Improvements in or relating to feed mechanism for tunnel furnaces
FR1486248A (fr) * 1966-07-08 1967-06-23 Illinois Nat Bank & Trust Co Perfectionnements aux dispositifs de chargement pour fours de traitement thermique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638125A (en) * 1948-03-20 1950-05-31 Stead & Company Ltd J Improvements in or relating to feed mechanism for tunnel furnaces
FR1486248A (fr) * 1966-07-08 1967-06-23 Illinois Nat Bank & Trust Co Perfectionnements aux dispositifs de chargement pour fours de traitement thermique

Also Published As

Publication number Publication date
DE9108520U1 (de) 1991-09-05
EP0522521B1 (fr) 1995-03-08
DE59201583D1 (de) 1995-04-13

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