FR2715085A1 - Self-cleaning stretcher with belts. - Google Patents

Abstract

The invention relates to self-cleaning screens of the type comprising essentially a filtering means (generally with fixed longitudinal bars), a waste drive means (generally with mobile rakes) and a means for cleaning the bars (the rakes themselves) . The screen, according to the invention, is characterized in that: a) the filtering means is made from trapezoidal belts (1), in motion, forming the grid, stretched between two end pulleys (2) and (3) ; b) the waste drive means is made from cleats (4) fixed to the belts (1); c) the means of cleaning the grid is made from scraping blades (5), fixed, placed between the belts.

Description

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  AUTONETTOYANT DEGRILLEUR WITH BELTS

  The invention relates to self-cleaning screens of the type

essentially bearing:

  a) filtering means, generally of the type with longitudinal bars

  fixed (fixed), able to pass the effluent and to retain the waste to be extracted; b) a means for driving said waste, generally of the transverse rake type in translation movement relative to said bars, suitable

  to entrain the said waste towards the upper part of the washing screen.

  to recover them by gravity in a receiving hopper; c) cleaning means, generally consisting of the rakes themselves

  passing between the bars, able to clean the bars and to

  the corresponding waste to the previous receiving hopper; d) a drive mechanism generally consisting of a driving pulley, coupled to a geared motor, and a deflection pulley which drive the moving parts; e) a frame generally consisting of two lateral flanges connected by

  spacers and supporting the drive and return pulleys.

  The screens of the type in question (bars and rakes) have various drawbacks and in particular those related to: - the high cost of producing such equipment due to the design of the bars and rakes; - fouling (especially grease) of the static bars where the effluent always acts in the same direction, this despite the displacement

rakes.

  The screen, according to the invention, considerably reduces said inconveniences

  vantages. It is essentially characterized in that: a) the filtering means is made from trapezoidal belts,

  forming a grid with longitudinal, parallel or substantially parallel elements

  lleles, stretched between the drive pulley and the idler pulley, in motion

  longitudinal axis between the two axes of said two pulleys and in motion

  circular circle beyond; b) the means for driving the waste is made from cleats fixed on the different belts, transversely and longitudinally, at regular intervals; C) the cleaning means is made from scraping blades, fixed,

  placed between the belts, in the descending part thereof.

  The features and advantages of the invention will appear

  more clearly on reading the following detailed description of a

  preferred embodiment of the invention given by way of non-limiting example

  and shown in the accompanying drawings.

  In these drawings: - Figure 1 is a longitudinal sectional view of the screen and its hopper; - Figure 2 is a partial top view of the belts in position on the end pulleys;

  FIG. 3 is a partial view in section CC of the belts and piles.

  buckets. The screen shown in the figures comprises: - a filtering means made from trapezoidal belts (1), forming a grid with longitudinal elements, parallel or substantially parallel, stretched between a driving pulley (2) and a return pulley (3) in linear longitudinal motion between the two axes (Ai) and (A2) of the two pulleys and in circular motion beyond, driven by the driving pulley; - A waste driving means made from cleats (4) fixed on the different belts, transversely and longitudinally, at regular intervals; - A cleaning means made by blades (5), fixed, placed between the belts, in the descending part thereof; - A waste receiving hopper (6) provided in its bottom with a sleeve (7) containing an endless screw (8) of waste extraction; - a hopper (9), in its lower part, surrounding the pulley (3) outside the cleats (4), provided in its bottom, a sleeve (10) containing a worm (11) of upwelling of the effluent and comprising

  a low input (F6) and a high output (F7).

  The worm (8) and (11) can be in the extension one of

  the other and made from the same screw.

  The scraping blades (5) can be fixed on the same axis (12), pivoting,

  able to free them completely from the belts by simple rotation (demon-

maintenance).

  The belts (1) can be made from a single belt 3-

continues without end.

  The pulleys (2) and (3) can be grooved to receive the trapezoidal profile.

  zoidal belts and serve at the same time as a guide.

  The scraping blades (5) can also serve as a guide for the belts.

  Of course, the invention is not limited to the embodiments described and shown for which other variants may be provided in: - the shape (section) and the number of belts; - the type of pulley (drum or other); - the shape and number of hoppers; - the type of cleat (wood, rubber ...), its fastening means on the belt (glue, screw ...) and their arrangement on the belts;

  without going beyond the scope of the invention.

  The arrow (F1) indicates the direction of rotation of the belts.

  The arrow (F2) indicates the direction of arrival of the effluent on the immersed part.

from the screen.

  The arrow (F3) indicates the fall of the waste brought up by the cleats (4).

  The arrow (F4) indicates the drop of waste scraped by the blades (5).

  The arrow (F6) indicates the entry of the effluent into the corresponding opening.

from the sheath (10).

  The arrow (F7) indicates the outlet of the effluent through the corresponding opening.

from the sheath (10).

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Claims (5)

  A self-cleaning debricator of the kind essentially comprising:   a) filtering means, generally of the type with longitudinal bars   fixed (fixed), able to pass the effluent and to retain the waste to be extracted; b) a means for driving said waste, generally of the transverse rake type in translation movement relative to said bars, suitable   to entrain the said waste towards the upper part of the washing screen.   to recover them by gravity in a receiving hopper; c) cleaning means, generally consisting of the rakes themselves   passing through the bars, able to clean the bars and to   the corresponding waste to the previous receiving hopper; d) a drive mechanism generally consisting of a driving pulley, coupled to a gearmotor, and a return pulley which drive the moving parts; e) a frame generally consisting of two lateral flanges connected by spacers and supporting the drive pulleys and return; characterized in that: a) the filtering means is formed from trapezoidal belts (1), forming a grid with longitudinal elements, parallel or substantially parallel, stretched between the driving pulley (2) and the return pulley (3) in linear longitudinal motion between the two axes (A1) and (A2) of the two pulleys and in circular motion beyond, driven by the driving pulley; b) the means for driving the waste is made from cleats (4) fixed on the different belts, transversely and longitudinally, at regular intervals; c) the cleaning means is produced by scraper blades (5), fixed,   placed between the belts, in the descending part thereof.   2- Degreaser according to claim 1, characterized in that the hopper (6) for receiving waste comprises, in its bottom, a sheath   (7) containing an endless screw (8) for extracting waste.   3. Debarrier according to claim 1, characterized in that it comprises   door, in its lower part, a hopper (9) surrounding the pulley (3), outside the cleats (4), and provided in its bottom, a sheath   (10) containing a worm (11) for raising the effluent. --5--   4. The screener according to claim 3, characterized in that the oven   water (10) has a low input (F6) and a high output (F7).   - Degreaser according to claims 2, 3 and 4, characterized in that   that the worm (8) and (11) are in the extension of one another and made from the same screw. 6. Drier, according to claim 1, characterized in that the scraping blades (5) are fixed on the same axis (12), pivoting, suitable for them.   completely release belts by simply rotating.   7-debricator, according to any one of the preceding claims,   characterized in that the belts (1) are made from a continuous single continuous belt.