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
  • F27D5/00—Supports, screens, or the like for the charge within the furnace
• • 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
  • F27D3/0021—Charging; Discharging; Manipulation of charge of ceramic ware
• • 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
  • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
  • F27D2003/0075—Charging or discharging vertically, e.g. through a bottom opening

Definitions

• the present invention relates to a thermal treatment installation comprising an oven, at least one treatment tank and means for transferring loads between said oven and said tank.
• Patent EP 0533615 describes an installation of this type, which comprises an oven with a vertical arrangement open downward and situated in an upper position, a tank provided with an elevator and placed in a lower position, and a horizontal access path , installed at the height of the base of the tank, provided with loading means and a charging elevator placed next to the tank so as to raise a load placed by the loading means on the elevator to introduce it into the oven.
• This is movable horizontally between a position located above the charging elevator and a position located above the tray.
• a sliding plane is arranged so that the horizontal movement of the oven causes the load supported by the elevator on the sliding plane.
• the above installation uses known solutions to place the load on an elevator before introducing it into a heating enclosure comprising a gas-tight bell which protects the components of the load against oxidation, l 'elevator then bringing the load in a starting position after heat treatment.
• the load is transferred by sliding on a sliding plane.
• Shifting is, in fact, carried out by the oven itself which pushes the load from one position to another, this displacement necessitating a refocusing with respect to the coordinates of the new enclosure into which the load is to be introduced.
• the dimensions of the load support must therefore allow sufficient positioning clearance inside the furnace heating bell. After the thrust by shifting on the sliding plane, this play is caught up initially and requires that the oven goes back to center the load on the new enclosure.
• the sliding plane is a cold zone on which the load is shifted.
• any variation in temperature is detrimental to the good quality of the treatment which follows the rise in temperature to a determined degree.
• the variable temperature change of the load on the sliding plane itself of variable temperature is therefore detrimental to the quality of the desired treatment.
• the components to be heat treated must be placed on the load support without their respective position being changed during the transfer after desired heating.
• the fact of using a sliding solution on a sliding plane by means of the oven itself causes vibrations detrimentally modifying the position of the components on the load support.
• the displacement by shifting of the load is provided to route it in front of several tanks arranged linearly or rotatably.
• the load must be able to be introduced into any bin according to an established program, the passage by sliding of the load over the bins not provided for in the program requires each time that the opening of the unplanned bin is obstructed by the introduction of a "plug", this both on the outward journey and on the return, so that the load does not fall into the first open bin but into the programmed one.
• the present invention aims to provide a support and load transfer device eliminating the drawbacks mentioned while retaining known principles for loading, transfer and evacuation of the load.
• the invention relates to a thermal treatment installation characterized in that it comprises:
• - loading / unloading means for introducing into the oven - or extracting from it -, through said opening, a support plate intended to receive components to be treated;
• a frame of variable shape associated with the bottom of the oven, capable of taking a first configuration, called open, in which it delimits, opposite said opening, a window allowing the free passage of the support plate and a second configuration, called closed, for which said window is partially closed so as to allow only the passage of the loading / unloading means, the frame then offering support zones on which the support plate comes to rest when said means are removed from the oven.
• the support plate is circular and is extended, downwards, by a tubular sleeve, the height of which is chosen according to the level which the support plate must occupy inside the oven.
• the frame is preferably placed under the bottom of the oven. It is formed by four identical arms articulated to each other, forming a square in the open configuration and a diamond in the closed configuration. In this case, two of the arms opposite one another are pivotally mounted in their center on studs integral with the bottom of the furnace. Furthermore, each arm is provided with a circular central cutout open towards the inside of the frame, the four cutouts delimiting a circle whose diameter is slightly greater than the outside diameter of the support plate.
• the frame is advantageously associated with a control lever secured to one of its arms.
• the installation comprises at least one treatment tank inside which are mounted loading / unloading means and on which the oven rests.
• the installation comprises several juxtaposed treatment tanks inside each of which are mounted loading / unloading means and above which the oven can be moved.
• - fig. 1 is a bottom view of the oven and its frame with variable shape in the open configuration
• - fig. 2 is a bottom view of the oven and its frame with variable shape in the closed configuration
• - fig. 3 is a front view in section of the oven and its contents when the frame is in the open configuration, the support plate being carried by the loading / unloading means;
• - fig. 4 is a front view in section of the oven and its contents when the frame is in the closed configuration, the support plate being carried by the loading / unloading means;
• - fig. 5 is a front view in section of the oven and its contents when the frame is in the closed configuration and the loading / unloading means have been removed;
• fig. 9 very schematically shows an installation according to the invention in which several ovens are associated with a set of juxtaposed treatment tanks.
• FIG. 1 shows a mobile oven 1, the bottom of which is pierced with a circular opening 3 and which can be moved, by means known to those skilled in the art. loom, above a series of juxtaposed bins 4a-bcdef (fig. 9) each equipped with a loading / unloading or lifting system 5 allowing to introduce into or out of the oven, through opening 3, a support plate 6 on which components to be treated are deposited 7.
• the opening 3 has a diameter slightly greater than that of the support plate 6 in order to allow its free passage.
• the furnace 1 is of the type known under the name of bell furnace. It has four side walls 8. Heating bodies 9 are arranged on its walls and are covered with a jacket 10. A turbine, not shown, ensures the uniformity of the speeds of the treatment gases in the enclosure.
• the support plate 6 is circular and extends downwards by a tubular sleeve 11.
• the tank 4a can be used to arrange the components 7 on the support plate, the tanks 4b-cd are tanks proper heat treatment and the 4th tank is used to unload the components.
• the furnace 1 has, under its bottom 2, a frame with variable geometry 12 capable of taking a first configuration, called open (fig. 1), in which it delimits, opposite the opening 3, a window in the shape of a square allowing the free passage of the circular support plate 6 and a second configuration, called closed (fig. 2), for which the window is partially closed in the shape of a diamond so as to allow only the passage of the elevator 5 , the frame 12 then serving as a base for the sleeve 11 when said elevator is removed from the oven.
• the frame 12 is formed by four identical arms 13 abcd connected to each other by four articulations 14. The arms 13a and 13 c, which face each other, pivot in their center on tenons 15 secured to the bottom 2 of the oven.
• Each of the arms 13 is provided with a circular central cutout 16 open towards the inside of the frame, these four cutouts delimiting a circle whose diameter is very slightly greater than the outside diameter of the support plate 6 which can thus freely cross the frame 12 when it is in open configuration.
• a control lever 17 is mounted articulated on the arm 13c by means of a lug 18.
• the frame When it occupies position O, the frame is in the open configuration (fig. 1) and delimits a window in the shape of a square.
• the frame When it occupies position F, the frame is in the closed configuration (fig. 2) and delimits a diamond-shaped window.
• the installation according to the invention operates in the following manner.
• the oven is, for example, positioned above the first tank 4a.
• the lever 17 occupying the position O for which the frame 12 has a square shape (FIG. 1), a support plate 6 carrying components 7 is, as shown in FIG. 3, introduced into the oven 1 by the elevator 5 of the tray 4a through the circular opening 3 of its bottom after having passed through the window of the frame 12 to which the four cutouts 16 of its arms 13 give a generally circular periphery corresponding to that of the support plate.
• the lower end of the sleeve 11 is then above the level of the frame 12.
• the control lever 17 is then moved manually to its position F, which causes the frame 12 to pivot on the two studs 15 and, at the same time, its deformation, thanks to the articulations 14, until it takes its diamond-shaped configuration ( Fig. 2), as shown in Figure 4. It is then observed that the arms 13 offer four support zones 20, highlighted in Figure 2, which are located exactly under the sleeve 11 of the support plate.
• the components to be treated 7 arranged on the support plate 6 can then be heated by the oven 1 to the desired temperature, after which the assembly is transferred horizontally, as it is, over one of the other tanks 4.
• the elevator 5 of the tank concerned raises the support plate 6 so as to bring it above the level of the frame 12.
• the lever 17 is then placed in position O to open the frame in its square position, which makes it possible to lower the elevator 5 and the support plate 6 into the tray for new processing operations.
• the installation according to the invention can comprise several ovens 1 making it possible to heat several loads of components to be treated at the same time 7.
• Figures 6, 7 and 8 correspond respectively to Figures 3, 4 and 5.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Tunnel Furnaces (AREA)
• Furnace Charging Or Discharging (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9526984

Family Applications (1)

Country Status (6)

Cited By (1)

Citations (7)

• 1998
  • 1998-06-02 FR FR9806980A patent/FR2779217B1/fr not_active Expired - Fee Related
• 1999
  • 1999-05-31 AU AU38086/99A patent/AU3808699A/en not_active Abandoned
  • 1999-05-31 WO PCT/CH1999/000235 patent/WO1999063289A1/fr active IP Right Grant
  • 1999-05-31 EP EP99920530A patent/EP1092121B1/de not_active Expired - Lifetime
  • 1999-05-31 DE DE69901446T patent/DE69901446T2/de not_active Expired - Fee Related
  • 1999-05-31 ES ES99920530T patent/ES2178433T3/es not_active Expired - Lifetime

Patent Citations (7)

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