MXPA99009678A - Cooler for particulate material - Google Patents

Abstract

Un enfriador (1) para enfriar material particulado el cual ha sido sometido a un tratamientode calor en un horno industrial (3), como es un horno giratorio para 5 fabricar cemento hidráulico, cuyo enfriador (1) comprende una entrada (4), una salida (5), paredes de extremo (6, 7), paredes laterales (8), un fondo (9) y un techo (10), por lo menos una superficie de soporte estacionaria (11) para recibir y soportar el material para ser enfriado, medios (lla, 12) para inyectar gas enfriador dentro del material, al igual que un sistema de raspadores oscilantes, el cual comprende un número de filas de elementos rascadores (14), arreglado transversalmente a través de la dirección del movimiento del material, los elementos raspadores se mueven a manera de vaivén en la dirección del movimiento del material para transportar el material hacia adelante a través de la superficie de soporte (11). El enfriador es peculiar porque cada fila de elementos raspadores transversos (14) estáfirmemente fija a por lo menos una placa de activación (16) orientada en la dirección del movimiento del material, la placa se extiende por lo menos a través de toda la longitud de la superficie de soporte (11), y se dirige ya sea a través de la superficie de soporte (11) del enfriador, su techo (10), una de sus paredes laterales (8) y/o por lo menos una de sus paredes de extremo (6, 7), donde la placa de activación (16) estáconectada al arreglo de activación para realizar un movimiento a manera de vaivén.

Description

PARTICULAR ATERIA COOLER DESCRIPTION OF THE INVENTION The present invention relates to a cooler for cooling particulate material which has been subjected to a heat treatment in an industrial furnace, such as a rotary kiln for manufacturing hydraulic cement, the cooler comprises a entrance, a -out, end walls, side wall, a bottom and a roof, at least one stationary support surface to receive and support the material to be cooled, means to inject the cooling gas into the material, just like an oscillating scraper system which comprises a number of stacks of scraper elements which extend transversely through the direction of movement of the material, the elements move back and forth in the direction of the movement of the material to be able to transport the materialX forward to the support surface. In EP 0718578 a cooler of the aforementioned type is described. In this known cooler, the scraper elements are made of crossbars with a profile in triangular cross-section, the bars are mutually connected by means of chains and move back and forth on the support surface by means of chain wheels adjusted to the ends of the support surface. This known cooler has several disadvantages. Due to the high temperatures which may occur in the cooler, and particularly at the inlet end of the cooler, as well as the substantial forces which are required to transport the material to. Through the cooler, the chains must be designed with relatively large dimensions. As a result, the chains will form the so-called shadow areas of equivalent size, ie, areas in which the chains obstruct the upward flow of the cooling gas in such a way that the superimposed material does not cool as intended. Also, the cross bars in the known cooler are not firmly fixed to restrict their movement, nor are they perpendicularly in the direction of the material of the movement nor in the terms of the rotation about their own longitudinal axis. In cases where a larger body of material is to be transported through the cooler, one or more cross bars can thus be forced vertically upwards, which can be transported in the body. This can reduce the transportation of the material through the cooler. In cases where a crossbar rises on one side only, the crossbar can also move to one side of the cooler, which will be operational disorders. The rotation of one or more of the crossbars can have an adverse effect on the efficiency of transportation. In addition, the known cooler is vulnerable to operational disorders, for example, in the case of the breaking of a single chain link, there is a need to turn off the cooler in order to perform the necessary repair work. Another disadvantage of the known cooler is that the drive system in the chain form consists of a wear part which must be replaced at regular intervals. The purpose of the present invention is to provide a cooler by means of which the aforementioned disadvantages are eliminated. _ This is achieved by means of a cooler of the type mentioned in the introduction, and which is characterized - because each row of transverse scraper elements is firmly fixed to at least one activation plate --- oriented in the direction of movement in material , and because the activation plate extends at least across the entire length of the support surface, and because the activation plate is directed either through the support surface, the ceiling, one of the walls lateral and / or at least one of the end walls of the cooler, where the activation plate is connected to an activation arrangement for reciprocating movement. Here you get a better and more uniform cooling of the material in the cooler, a better and safer transportation of the material through the cooler, a higher degree of operational reliability and a reduction of wear to which the activation elements are exposed.The cooling of the material is improved due to the fact that the Activation system can be designed with smaller dimensions, which reduces the shadow area, among other things, this is attributable to the fact that the activation plate extends across the entire length of the support area It will always be moving along with its own lane, which means that it will never push the material deposited in front of it. Also ^ "As is the case with the known chain option, a chain force will not have accumulated. through the cooler. The transportation of the material through the cooler is improved because the scraper elements are firmly fixed to the activation plate. As a result, scraper elements will never be able to move perpendicularly with respect to the direction of the material of the movement, nor can they rotate around their own center axis. The cooler obtains a higher degree of operational reliability. because, essentially, the right scraper elements - are exposed to wear. In the event that a single scraper element is broken, the operation of the cooler "may continue without any noticeable problem until the next interruption for maintenance is carried out." The activation plate is only subjected to minimal wear due to the fact that As mentioned above, it moves back and forth along its own lane. --- As mentioned above, the activation plate can be directed through the surface-, support of the cooler, its roof , one of its side walls-, and / or at least one of its end walls.In the cases - where the activation plate is directed through the support surface, it is preferred that the activation plate --- is- substantially vertical, and is always above a part of its length, equivalent to the length of the support surface, which extends at least downwards into a groove, which is provided -a through the length of the support surface, and moreover, that in addition at least parts of its length, extends downwards through the slot to an overlapping chamber in which the activation plate is connected to an array of -Activation for its movement as a swing. ^ __ To protect the activation plate and protect the support surface against falling material, the cooler can also be designed in such a way that on both sides of the activation plate understand a wall element which is fixed to the surface of. support, with the wall elements extending over the entire length of the support surface-and slightly coming out slightly less inside the cooler than the activation plate, so that on the upper side of the activation plate and over its entire length, a plate element is fitted, which is designed to extend above and beyond the upper side edge of the wall elements. Therefore, the activation plate and the groove in which the latter is guided is protected - effectively against the material in the cooler, thereby minimizing wear on the activation plate and effectively retains the material to gain access - to the groove in the support surface. In the mode, only the plate element fits on the activation plate which moves back and forth in the material, and does so along its own rail, in such a way that the wear on the plate is negligible . To minimize the torsional forces, which the activation plates must be capable of absorbing, and in this way reduce the necessary dimensions of the activation plate, it is preferred that each row of transverse scraper element - be fixed to at least two activation plates - substantially parallel. The activation arrangement, which supports and activates the activation plate and plates in the compartment below the support surface, may comprise an activation structure which is preferably made of two longitudinal beams and at least two transverse beams. The transverse beams can be designed as reinforcement clamps to improve the stiffness of the activator structure. In the preferred embodiment where each row of transverse scraper element is fixed to two activation plates, the activation plates are fixed to the longitudinal beams. Each of the longitudinal beams of the activator structure can be movably supported in at least two places by fixed rails to the underside of the longitudinal beams, the rails are slid on balines, preferably linear roller bearings or bearings, which are fixed to the structure of the machine at an appropriate distance. It is preferred that the structure of the activator be supported by two balines for each longitudinal beam. In principle, the structure of the activator can be activated in a reciprocating manner using any means appropriate for the purpose, but it is preferred that the structure of the activator be activated by one or several hydraulic cylinders which are connected to the cross beams of the structure of the activator. In cases where the cooler comprises two or more rows of scraper elements transversely across the cooler, it is preferred that each row is separately activated in this way, the speed as well as the length of movement by which the single rows are move "as a back and forth can be varied independently for each row so that the desired movement pattern of the material through the cooler can be obtained.The scraper elements can be firmly fixed to the plate and activation plates in any suitable manner, but for reasons of maintenance it is preferred that this fixing be done by mechanical means.The fastening means can be configured in a variety of ways, and can in what is probably the simplest configuration consist of screws which through bored holes in the scraper elements are screwed up to the activation plate.In a similar simple configuration, the means fasteners may consist of an angle iron fixed by means of screws to the activation plate as well as to the scraper element. Because the technical load and wear exposure of the fastener means can be substantial, it would be advantageous if the fastener means were configured with due attention given to these factors. Therefore, it is preferred that each scraper element be fixed to the upper side of each activation plate-by means of a substantially box-shaped element which, on its side facing towards the activation plate, comprises a section cut which can be complementary to the profile in cross section of the element. scraper. On each side of the cutout section of the box element are configured with at least one cavity that terminates downwardly to accommodate the shape of lugs projecting upwardly from the activation plate which are provided with a hole which during the assembly of the box element is placed in accordance with a corresponding hole and provided in the box element. Together with the assembly of the element, a wedge is struck through the holes in both sides of the scraper element, whereby the box element and thus the scraper element is retained against the activation layer. Subsequently, each wedge can be locked by means of a locking pin which is struck into a hole subsequently drilled through at least the relevant and wedge ear. The scraper element can also be restricted from axial movement by means of a pin or a ratchet, which is inserted into a hole in scraper element and extends upwards through a hole in side facing upwards of scraper element. To allow for axial movement - less of scraper element, for example in case of dimensional-mal changes, size of hole on side facing upwards of box element may slightly exceed size of pin or ratchet. This will allow scraper element to move freely in its longitudinal direction. In cases where scraper element is mounted on two or more activation plates, it is preferred that a pin or ratchet be fitted on one of activation plates so that scraper element is freely held to allow axial dimensional changes of o or o fixing points. - ~~ ~~ In order to be able to satisfy the requirement of each activation plate at any time through the entire length of the support surface that extends downwards within its respective slot, the activation plate must be configured with a length corresponding to at least one length of the supporting surface plus the selected movement length of the activation plate. In some cases where the support surface at the inlet end of the cooler is located close against the end wall of the cooler, it will therefore be necessary to direct the activation plate through an opening provided in the end wall of the cooler. cooler. The opening may preferably be configured in such a way that it corresponds exactly to the cross-sectional profile of the activation plate and the element of the plate resting on it. To capture the dust that accompanies the activation plate through the opening, a pressurized box can be adjusted to the outside of the cooler, with the depth of the box ~ corresponding to at least a selected length of plate movement of activation. In an alternative embodiment, the activation plate can be guided through the side wall of the cooler. In this case it is preferred that the activation plate be substantially horizontal, and that it always extend over a part of its length, equivalent to the length of the support surface, and at least within a slot provided in one of the side walls of the cooler, whose groove has a length which corresponds to at least the length of the support surface, and, in addition, that over at least part of its length extends a little further outwards to through - the groove of the surrounding environment where the activation plate is connected to an activation arrangement to produce a reciprocating movement. It is preferred that the cooler in this mode be provided with an activation plate on both sides. To absorb the potential thermal expansion, the activation plates may be provided with slits provided at appropriate intervals. The scraper elements may consist of bars having a substantially cross-sectional profile. triangular, preferably a right triangular profile, the "forward pushing surface which is more angled than its sliding surface which is facing backwards, and its surface which is facing downwards being substantially horizontal. The surface facing forward is typically configured in such a way that it extends at an angle oi of between 60 and 90 ° relative to the horizontal, while the surface facing backwards is typically configured in such a way which extends to an angle ß between 20 and 40 ° with respect to the horizontal.The lower part of the sliding surface that is facing backwards can be configured more angled than the rest of the sliding surface to be able to reduce the sharpness of the lateral ridge that is facing backwards, with this the wear characteristics of resistance are improved. the movable scraper elements, the chiller can also comprise stationary scraper elements which are preferably fixed to the longitudinal beams fitted on the sides of the support sides. In a particular embodiment of the cooler according to the invention, each second scraper element is stationary. The stationary and movable scraper elements may be differently configured with one view to obtain a desirable pattern of transport of L-material within the cooler.

Due to operational reasons, which specifically relate to the efficiency of the cooler, it may be advantageous to minimize the movement of the material in the longitudinal direction of the cooler at the inlet end of the cooler. The so-called stationary input canFor example, it can be obtained by configuring the cooler without the scraper elements at the "inlet end." In case it is desired to agitate the material at the inlet end, the cooler may be configured with, for example, scraper elements. which point in the opposite direction to the inlet end, with scraper elements with equal sides with the inlet end or with alternative geometries that provide a desirable pattern of transportation Each of the stationary support surfaces may in a preferred embodiment consist of a grate which is made of a grid plate number, each of which is provided with slits or holes for injecting the cooling gas through the material from the superimposed compartment The arrangement is described in WO 94/08191 and WO 94/08192, which are incorporated herein by reference, The stationary support surface in the alternative embodiment can They consist of a number of trays which are designed- as rectangular boxes with bottom, side walls and end walls, and which contain, during the operation, a quantity of particulate material which is to be cooled, and which incorporates in the bottom of each tray a number of gas supply means for injecting the cooling gas into the material. The arrangement is described in WO 94/15161, which is incorporated herein by reference. In cases where the support surface consists of a grate or tray, it is preferred that the gas supply to each grate plate or tray by means of flow regulators adjusted in the gas supply pipe of each plate or Grill plate or tray is supplied continuously and automatically in direct response to the condition of the gas flow in and above the relevant grill plate or tray. The arrangement is described in WO 97/07881, which is incorporated herein by reference. BRIEF DESCRIPTION OF THE INVENTION The invention will now be described in detail with reference to the drawings, being diagrammatic, and in which: Figure 1 shows a longitudinal section of a first embodiment of the cooler according to the invention; Figure 2 shows a cross section taken along line 2-2 of Figure 1; Figures 3 shows a top view as seen from line 3-3 in Figure 1 with parts partially cut; Figure 4 shows a first sectional detail of a sealing arrangement; Figures 5a to 5e show details of the scraper assembly; Figure 6-shows in plan a second mode of the cooler; and Figure 7 shows a sectional detail of another - modality. In Figures 1, 2 and 3 the cooler 1-l- is seen, which is placed in a direct extension of a rotary kiln 3 to manufacture hydraulic cement. The chiller comprises an inlet 4, an outlet 5, and end stops 6, 7, side walls 8, a bottom 9, and a roof 10. The chiller shown also comprises a stationary grill bottom 11 which is made of a number of grills plates to support the hydraulic cement, a fan 12 for injecting the cooling gas upwards through the hydraulic cement via a compartment 13- and the grill bottom 11, as well as a row of scraper elements _ 141 which can be moved back and forth in the longitudinal direction of the cooler by means of activation means 15, so that the hydraulic cement is transported from the inlet end of the cooler to its outlet end. The chiller may be configured with several rows placed in parallel of the scraper elements 14. If so, it is preferred that each row be activated by separate activation means. The cooler shown further comprises continuous and automatic operation flow regulators 11b which are adjusted in the gas supply duct 11c of each grill plate to regulate the flow of cooling gas up through the grill plate. in question . In the embodiment shown, the scraper elements are mounted on two activation plates vertically placed. 16 which extend downwardly through the slot 24 provided in the bottom of the grill 11, and which are supported by a structure which is made of two longitudinal beams 17 and a number of crossed beams 18. The structure is movably supported by means of rails 19 that are fixed to the underside of the longitudinal beams -17 and linear bearings 20 which are fixed to the structure of the machine. It is preferred that the structure be supported by exactly two pellets for each longitudinal beam because the system does not become statically indeterminate thereby. This will avoid the accumulation-of internal stress that results, for example, from deformations which could subject the pellets to an unusually stressful load. The activation plates 16 are configured with a length which corresponds to the length of the grill bottom 11 itself the length of movement of the activation plates. In Figures 1 and 3, the activation plates are shown in their fully retracted position where each of the plates exits through an opening 21 provided in the inlet end wall 6 of the cooler. The opening is designed to correspond exactly to the profile of the cross section of the activation plate and the plate element placed on it. In order to capture the powder that is conducted through the openings 21, a pressurized box 22 through which the collected dust is returned to the cooler is adjusted to the outside of the cooler. The box 22 is pressurized by air coming from the compartment 13 or from an external air supply source, such as a fan or a compressor. The openings-21 can be individually sealed "by means of a sliding seal which is configured as a complement to the plate element placed on the activation plate, and transported thereon.In connection with the maintenance work, the plates activation can be pulled through the end wall 6 or pulled vertically up through the bottom of the grid, as illustrated in Figure 1, the activation plates are formed with slits 23 to absorb a potential thermal expansion in the uppermost part - of the activation plate to prevent the bowing of the activation plate. In Figure 4, there is shown an example of how the grate surface 11 can be advantageously protected against material fall while, at the same time, the activation plate 16 is protected against exposure to wear of the material in the cooler. In the example shown, the sealing arrangement comprises two angular wall elements 25 which are fixed on each side of the activation plate to the bottom of the grill 11 and to the plate element 26-which is configured as an inverted U and which is mounted on the upper side of the activation plate where it is retained for example by means of the scraper elements 14. In the longitudinal direction of the cooler, the wall elements 25 have the same length as the scraper surface 11, while that the plate member 26 has the same length as the activation plate. As shown-by the dotted lines in Figure 4, the sealing arrangement can further comprise two wear caps 27 which are inserted on top of separate wall elements 25.

The position of the grill plates in relation to the sealing arrangement is also shown by the dotted lines. Figures 5a, 5b and 5c show an example of how the scraper elements 14 can be firmly fixed on an activation plate 16. In the example shown, the fixing is done by means of a block 30 as shown in Figure 5a which is formed with a depressed section 31 for accommodating the scraper element, and with two holes 32. As shown in Figure 5b, the activation plate 16 is formed with lugs 34 which protrude through the sections cut into the plate element 26, "each being formed with a hole -35. The position of the scraper element 14 is shown by the dotted lines 36. In the assembly step, the scraper element 14 is assembled as shown in Figure 5c on the plate member 26 between the two lugs 34, and thereafter the block is positioned at the top so that the lugs 34, as indicated on the left side of the block, come up through the cavities 36 provided in the block, the scraper element extends through the cut-31 section, and the holes 32 in the block are aligned by the holes 35 in the lugs 34. A wedge 37 is then struck through the holes 32, 35 on both sides of the scraper element 14. The wedges 37 are blocked by means of block pins 38, each of which extends through the ear 34 and inside wedge 37. The scraper element 14 is retained by means of a ratchet 39 which is mounted on the scraper element 14, and which extends upwards through an orifice 40 provided in the block 30. As can be seen in Figures 5b and 5c, the scraper elements are made of bars with an angled triangular profile right in section, the forward facing thrust surface 36a which is "more angled than its sliding surface that is facing back 36b, and the surface that is being viewed has down, which is substantially substantially horizontal. The surface facing forward extends at an angle a. within 60 and 90 ° in relation to the horizontal, while the backward facing surface extends to an angle β of between 20 and 40 ° relative to the horizontal. The upper part of the sliding surface facing backwards can be configured in such a way that it is more angled than the rest of the sliding surface in order to reduce the sharpness of the lateral edge that is facing backwards, thereby improve wear-resistance characteristics. Alternatively, at least some of the scraper elements may have their more angled face facing back, as shown in Figure 5d; or have the shape of an isosceles triangle in section, as shown in Figure 5e. In Figure 6 a cooler can be seen which, in addition to the movable scraper elements 14, also contain stationary scraper elements 14a which are fixed to the longitudinal beams 42 fitted on the sides on the support surface 11. In the embodiment shown , every second scraper element is stationary. Some of the scraper elements can be omitted at the end-e "input as shown in the diagram with dotted lines of elements 14 and 14a in Figures 3 -and 6. In Figure 7, you can see an example of how an activation plate 16 can, instead, be directed through a slot 44 provided in the side wall 8 of the cooler In the embodiment shown, the scraper element 14 is mounted to the activation plate 16 via a spacer 45 which provides the necessary space for mounting the sealing means 46. Also sealed on the activation plate 16 are sealing means 47 to minimize the leakage of powder and cooling gas from the cooler.

Claims (21)

1. CLAIMS 1. A cooler for cooling particulate material which has been subjected to heat treatment in a fresh industrial furnace such as a rotary kiln for manufacturing hydraulic cement, whose cooler comprises an inlet, an outlet, end walls, side walls, a bottom and a roof, at least one stationary support surface for receiving and supporting the material to be cooled, means for injecting coolant gas into the material, as well as a system of oscillating scrapers which comprises a number of rows of scraper elements. , which extend transversely through the moving direction of the material, the elements move back and forth in the direction of movement of the material to be able to transport the material forward on the support surface, characterized in that each row of transverse scraper elements are firmly fixed to at least one activation plate oriented in the direction of the movement of the material, and because that plate extends at least across the entire length of the support surface, and because the activation plate is directed either through the support surface, the ceiling, one of the side walls and / or at least one of the end walls of the cleaner, where the activation plate is connected to an activation arrangement to perform a, reciprocating movement. The chiller according to claim 1, characterized in that the activation plate is substantially vertical, and in that at all times over a part of its length, corresponding to the length of the support surface, extends at least "downwardly into a slot, which is provided across the length of the support surface, and because furthermore at least part of its length extends down through the slot to a camera superimposed on the - the activation plate is connected to an activation arrangement to perform a reciprocating movement 3. The cooler in accordance with claim 2, characterized in that on both sides of the activation plate comprises an element of wall which is fixed to the support surface, and because extending -about the entire length of the support surface comes out slightly less inside the cooler than the active plate. and, because "on the upper side" of the activation plate and above all its length is adjusted to a de-plate element with the element being designed to extend above and beyond the upper lateral flange of the wall elements . 4. The cooler according to claim 2, characterized in that each row of transverse scraper elements is fixed to at least two substantially parallel activation plates. "" 5. The cooler according to claim 4, characterized in that the activation arrangement comprises an activation structure which is made of two longitudinal beams and at least two transverse beams and because the activation plates are fixed to the longitudinal beams 6. The cooler according to claim 5, characterized in that each of the longitudinal beams of the activation structure are movably supported in at least two places by means of fixed rails on the underside of the longitudinal beams, and because the rails slide on balines, such as linear roller bearings or bearings, which are fixed to the structure of the machine at an appropriate distance 7. The cooler according to claim 6, characterized in that it comprises minus a hydraulic cylinder to move the activation structure in a back and forth manner, the hydraulic cylinder is connected to one of the beam s transverse of the activation structure. The cooler according to claim 7, characterized in that it comprises at least one hydraulic cylinder per scraper element row., and because the hydraulic cylinders can be operated separately. The cooler according to claim 2 or 4, characterized in that each scraper element is fixed to the upper side of each activation plate, by means of a box-like element, which on its side facing towards the activation plate comprising a section cut to accommodate the scraper element, and in that each side of the cut section is formed with at least one cavity terminating downward to accommodate the shape of the top side of the lugs protruding from the activation plate, which are provided with a hole which during the assembly of the box element is placed in line with a corresponding hole provided in the box element, and a wedge is adjusted in such a way that it extends through the holes in the box. both sides of the scraper element, and because each wedge is blocked by means of a locking pin which extends at least through the ear relieves and the wedge, and the scraper element is furthermore retained in an axial direction by means of a ratchet which is inserted inside the scraper element which extends upwards through a hole in the side facing upwards of the scraper element. box. 10. The cooler according to any of the previous claims, characterized in that each activation plate has a length which corresponds to at least the length of the support surface, plus the selected movement length of the activation plate. . The cooler according to claim 10, characterized in that each activation plate is directed through an opening provided in the end wall of the cooler, whose opening is configured in such a way that it corresponds exactly to the cross-sectional profile of the cooler. activation plate and the plate element that is disposed thereon, and because a pressurized box is fitted on the outer side of the cooler, with the depth of the box corresponding at least to the selected movement length of the plate activation. 12. The cooler according to claim 1, characterized in that the activation plate is substantially norizontal, and because always above a part of its length corresponding to the length of the support surface, the plate extends at least within of a slot provided in one of the side walls of the cooler, whose slot has a length which corresponds to at least the length of the support surface, and which above at least part of its length extends beyond through the slot where it connects to an activation arrangement to perform a swinging motion. 13. The cooler according to claim 12, characterized in that it comprises an activation plate on each side. The cooler according to claim 1, characterized in that each activation plate is provided with slits provided at appropriate intervals for the absorption of the potential thermal expansion. 15. The cooler according to claim 1, characterized in that the scraper elements are formed with a triangular profile in cross section, where the surface facing forward extends at an angle of between 60 and 90 ° with respect to the horizontally, and because the rearwardly facing surface extends substantially at an angle β of between 20 and 40 ° relative to the horizontal, where the surface facing downwards is substantially horizontal. 16. The cooler according to claim 1, characterized in that it also comprises stationary scraper elements. 17. The cooler according to claims 1 to 15, characterized in that it is formed without scraper elements at the inlet end (figures 5d and 5e). 18. A cooler according to claim 1 or 15, characterized in that it comprises scraper elements of equal size or inverted at the inlet end. The chiller according to claim 1, characterized in that each of the stationary support surfaces comprises a grid which is made of a number of grid plates, each of which is provided with slits or holes for injecting gas cooler through the material from the superimposed chamber. The chiller according to claim 1, characterized in that each of the stationary support surfaces comprises a tray number which are formed as a rectangular box with bottom, side walls and end walls, the box contains during the operation a quantity of particulate material which is to be cooled, and because at the bottom of each tray there are incorporated air supply means for injecting cooling gas into the material. 21. The chiller according to claim 19 or 20, characterized in that it comprises flow regulators of continuous and automatic operation, which are adjusted in the gas supply duct of each grille plate or tray to regulate the flow of gas. Gas "cooler up through the grill plate or tray in question. SUMMARY A cooler (1) for cooling particulate material which has been subjected to a heat treatment in an industrial furnace (3), such as a rotary kiln for manufacturing hydraulic cement, whose cooler (1) comprises an inlet (4), an outlet (5), end walls (6, 7), side walls (8), a bottom (9) and a roof (10), at least one stationary support surface (11) for receiving and supporting the material to be cooled, means (lia, 12) for injecting coolant gas into the material, as well as a system of oscillating scrapers, which comprises a number of rows of scraper elements (14), arranged transversely through the direction of movement of the material, the scraper elements move back and forth in the direction of movement of the material to transport the material forward through the support surface (11). The cooler is peculiar because each row of transverse scraper elements (14) is firmly fixed to at least one activation plate (16) oriented in the direction of movement of the material, the plate extends at least through all the length of the support surface (11), and is directed either through the support surface (11) of the cooler, its roof (10), one of its side walls (8) and / or at least one of its end walls (6, 7), where the activation plate (16) is connected to the activation arrangement to perform a movement to way of swinging.