Fire grate module, fire grate assembly and incinerator

Abstract

The invention discloses a fire grate module, a fire grate assembly and an incinerator. The fire grate module comprises a fire grate module body, and positioning supporting legs are arranged on the fire grate module body; the fire grate module comprises a fire grate module body, a plurality of fire grate supporting devices which are supported at different positions of the fire grate module body, sliding expansion seats are arranged on the fire grate supporting devices, and the positioning supporting legs are arranged on the sliding expansion seats in a sliding fit mode. And at least one sliding expansion seat is provided with a limiting guide rail for limiting the positioning supporting leg to slide in the direction perpendicular to the garbage conveying direction. The positioning supporting legs are in sliding fit with the sliding expansion seats, that is, the positioning supporting legs are not fixed to the sliding expansion seats but are arranged on the sliding expansion seats in a floating mode, so that when the fire grate module body is heated and expands in volume, the positioning supporting legs can slide along the sliding expansion seats, and the situation that the fire grate module body and the sliding expansion seats are different in expansion volume due to different temperatures is prevented; and the connecting part is broken.

Description

Technical Field

[0001] The present application relates to the technical field of incinerators, and more specifically, to a grate module, a grate assembly and an incinerator. Background Art

[0002] With the continuous increase of domestic waste, mechanical grate incinerators have gradually occupied a dominant position in domestic waste incineration due to their strong adaptability to waste and reliable operation.

[0003] Mechanical grate incinerators primarily consist of a drying section, a combustion section, and a burnout section along the waste conveying path. As waste composition becomes increasingly complex and higher calorific value waste is processed, incineration conditions become more complex. Complex waste and high calorific value waste require higher combustion temperatures, and during operation, the incinerator can experience thermal expansion due to high temperatures, potentially breaking the incinerator's support points.

[0004] Therefore, how to avoid support point breakage and improve installation reliability is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the object of this application is to provide a grate module to avoid support point breakage and improve installation reliability;

[0006] Another object of the present application is to provide a grate assembly and an incinerator having the above-mentioned grate module.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] In a first aspect, the present application provides a grate module, comprising:

[0009] A grate module body, wherein the grate module body is provided with positioning legs;

[0010] The grate support device includes a plurality of grate support devices supported at different positions of the grate module body, a sliding expansion seat is provided on the grate support device, the positioning legs are slidably fitted on the sliding expansion seat, and at least one of the sliding expansion seats is provided with a limiting guide rail for limiting the sliding of the positioning legs in a direction perpendicular to the garbage conveying direction.

[0011] In a possible implementation, the sliding expansion seat includes an expansion seat base, an expansion seat connector and an expansion seat slide, wherein the expansion seat connector is connected between the expansion seat base and the expansion seat slide;

[0012] The expansion seat base is fixed on the grate support device, and the positioning legs are slidably fitted on the expansion seat slide;

[0013] In the case where the limiting guide rail is provided on the sliding expansion seat, the limiting guide rail is provided on the expansion seat slide plate, and the limiting guide rail and the expansion seat slide plate form a guide groove for the sliding of the positioning leg.

[0014] In a possible implementation, along the first direction, both ends of the grate module body are supported by the grate supporting device;

[0015] Along the second direction, both ends of the grate supporting device are provided with the sliding expansion seats, the first direction is perpendicular to the second direction, and the first direction is the garbage conveying direction.

[0016] In a possible implementation, the grate module body includes a grate frame, the grate frame includes an upper frame and a frame lower box located below the upper frame, the upper frame supports a fixed grate beam, and the fixed grate beam is provided with a grate block;

[0017] From top to bottom, the cross-sectional area of the lower box of the frame gradually decreases.

[0018] In a possible implementation, the plane where the axes of the fixed grate beams are located is a reference plane, and the angle between the side wall of the lower box of the frame and the reference plane is θ, and the angle θ is 40°-70°.

[0019] In a possible implementation, the grate frame is provided with frame reinforcement ribs;

[0020] and / or;

[0021] The fixed grate beam is provided with fixed grate reinforcement ribs.

[0022] In a possible implementation, the frame reinforcement ribs include first frame reinforcement ribs arranged on the outer side wall of the grate frame and second frame reinforcement ribs arranged on the inner side wall of the grate frame.

[0023] In a possible implementation, the first frame reinforcement ribs are located on the lower frame box, the second frame reinforcement ribs are located on the upper frame, and the fixed grate reinforcement ribs are connected to the second frame reinforcement ribs.

[0024] In a possible implementation, the fixed grate reinforcement ribs include:

[0025] Transverse plate reinforcement ribs parallel to the fixed grate beam and arranged at intervals;

[0026] connecting the horizontal plate reinforcement ribs and the vertical plate reinforcement ribs of the fixed grate beam;

[0027] The vertical beam reinforcement ribs connect the horizontal plate reinforcement ribs, the fixed grate beams and the vertical plate reinforcement ribs, and the vertical beam reinforcement ribs are multiple and spaced apart along the extending direction of the fixed grate beams.

[0028] In a possible implementation, the grate module body includes a movable grate assembly, and the driving source of the movable grate assembly is a driving cylinder;

[0029] A mounting base is fixed on the outer side of the grate frame, the drive cylinder is hinged on the mounting base, and the mounting base is located on the lower side of the lower box of the frame, so that the drive cylinder is located in the narrowed area on the lower side of the lower box of the frame.

[0030] In a possible implementation, when a plurality of the grate modules are arranged in a direction perpendicular to the conveying direction of the garbage, at most one driving cylinder is arranged between any two adjacent grate modules;

[0031] and / or,

[0032] A diagonal brace is provided between the mounting base and the grate frame.

[0033] In a possible implementation, there is one driving cylinder, which drives the movable grate block assembly of the movable grate assembly through a synchronization mechanism. The movable grate block assembly includes two grate driving beams that are slidably fitted in the grate frame, and a movable grate beam supported on the two grate driving beams, and a grate block is provided on the movable grate beam.

[0034] The driving cylinder drives the two grate driving beams to move synchronously through the synchronization mechanism.

[0035] In a possible implementation, the synchronization mechanism includes:

[0036] a synchronization shaft rotatably supported on the grate frame;

[0037] A cylinder crank is fixed on the synchronization shaft, one end of the driving cylinder is hinged to the mounting base, and the other end is hinged to the cylinder crank;

[0038] There are two crank-connecting rod mechanisms corresponding one to one to the two grate driving beams, and the push rod crank of the crank-connecting rod mechanism is fixed on the synchronization shaft, and the push rod body of the crank-connecting rod mechanism is hinged to the grate driving beam.

[0039] In a possible implementation, a fixed support is provided in the grate frame, a guide wheel device is provided on the fixed support, a first slide is provided on the grate drive beam, and the guide wheel device and the first slide are in rolling engagement;

[0040] and / or,

[0041] A limiter is provided in the grate frame, and a second slide plate arranged opposite to the limiter is provided on the grate driving beam. The plate surface of the limiter is parallel to the plate surface of the second slide plate and is spaced apart by a preset distance.

[0042] In one possible implementation, a limiting groove is provided on the wheel surface of the guide wheel of the guide wheel device, and the first slide includes a slide seat and a slide body provided on the slide seat and cooperating with the limiting groove of the guide wheel, and the slide seat is fixed on the grate drive beam.

[0043] In a possible implementation, both ends of the synchronization shaft are rotatably supported on the grate frame through bearing seats, and a sealing device is provided at the junction of the grate frame and the synchronization shaft.

[0044] In one possible implementation, the sealing device includes:

[0045] A sealing gasket, comprising a first flange portion, a sleeve portion, and a blocking portion, wherein the first flange portion is fixed to the grate frame, the sleeve portion and the blocking portion are sleeved on the synchronous shaft, and a sealed space is formed between the sleeve portion and the synchronous shaft;

[0046] a packing disposed in the sealed space, with a first end thereof being limited by the blocking portion;

[0047] The gland includes a second flange portion and a limiting portion, the second flange portion is fixed on the first flange portion, the limiting portion is inserted into the sealed space, and the second end of the packing is limited by the limiting portion.

[0048] In a possible implementation, the grate module body includes a movable grate block assembly, and the movable grate block assembly includes a grate driving beam slidingly fitted in the grate frame, and a movable grate beam supported on the grate driving beam;

[0049] An anti-deviation roller device is provided in the grate frame, and the anti-deviation wheel of the anti-deviation roller device abuts against the grate driving beam.

[0050] In a possible implementation, the movable grate beam includes:

[0051] The movable grate beam body is used to support the grate blocks;

[0052] An assembly connected to the movable grate beam body, the assembly being used to connect to the grate drive beam;

[0053] The movable grate reinforcement rib is arranged on the movable grate beam body and connected to the assembly body.

[0054] The grate module provided in the present application is provided with a plurality of positioning legs on the grate module body, and a sliding expansion seat is provided on the grate support device, and the positioning legs are slidably matched on the sliding expansion seat. That is, the positioning legs are not fixed to the sliding expansion seat, but are floatingly provided on the sliding expansion seat, so that when the volume of the grate module body is heated and expanded, the positioning legs can slide along the sliding expansion seat, thereby preventing the risk of fracture at the connection due to different temperatures and different expansion volumes. A limiting guide rail is provided on the sliding expansion seat, which can limit the positioning legs from sliding in a direction perpendicular to the garbage conveying direction, thereby preventing the positioning legs from detaching from the sliding expansion seat in the above direction. In the garbage conveying direction, since the two ends of the grate assembly usually need to be fixed, there is no need to provide a limiting device on the sliding expansion seat.

[0055] A second aspect of the present application provides a grate assembly comprising at least one grate module column, each of the grate module columns comprising a plurality of grate modules arranged along a garbage conveying direction, the grate modules being the grate modules as described in any one of the above items.

[0056] In a possible implementation, the grate modules are arranged in multiple rows, and each row of the grate modules is arranged perpendicular to the garbage conveying direction.

[0057] The grate assembly provided in this application has all the technical effects of the above-mentioned grate module because it has the above-mentioned grate module, and will not be described in detail herein.

[0058] A third aspect of the present application provides an incinerator comprising the grate assembly as described above.

[0059] The incinerator provided in this application has all the technical effects of the above-mentioned grate assembly because it has the above-mentioned grate assembly, and will not be described in detail in this article. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0061] Figure 1 This is a front view of the grate assembly disclosed in an embodiment of the present application;

[0062] Figure 2 A side view of a grate assembly disclosed in an embodiment of the present application;

[0063] Figure 3This is a schematic diagram of the internal structure of the grate module disclosed in the embodiment of the present application;

[0064] Figure 4 A side view of a grate module disclosed in an embodiment of the present application;

[0065] Figure 5 A front view of a sliding expansion seat with a limiting guide rail disclosed in an embodiment of the present application;

[0066] Figure 6 A side view of a sliding expansion seat with a limiting guide rail disclosed in an embodiment of the present application;

[0067] Figure 7 A front view of a sliding expansion seat without a limiting guide rail disclosed in an embodiment of the present application;

[0068] Figure 8 A side view of a sliding expansion seat without a limiting guide rail disclosed in an embodiment of the present application;

[0069] Figure 9 A side view of the internal structure of the grate module disclosed in an embodiment of the present application;

[0070] Figure 10 A partial enlarged view of the limiter disclosed in the embodiment of the present application;

[0071] Figure 11 A side view of the grate frame disclosed in an embodiment of the present application at the mounting base;

[0072] Figure 12 This is a schematic structural diagram of the lower box of the frame disclosed in an embodiment of the present application at a certain angle;

[0073] Figure 13 This is a schematic structural diagram of the lower box of the frame disclosed in an embodiment of the present application at another angle;

[0074] Figure 14 This is a schematic structural diagram of the mounting base disclosed in an embodiment of the present application at one angle;

[0075] Figure 15 This is a schematic structural diagram of the mounting base disclosed in an embodiment of the present application at another angle;

[0076] Figure 16 A cross-sectional view of a sealing device disclosed in an embodiment of the present application;

[0077] Figure 17 This is a schematic structural diagram of the guide wheel device disclosed in an embodiment of the present application at one angle;

[0078] Figure 18 This is a schematic structural diagram of the guide wheel device disclosed in an embodiment of the present application at another angle;

[0079] Figure 19 This is a schematic structural diagram of the first slide plate disclosed in an embodiment of the present application;

[0080] Figure 20 This is a structural schematic diagram of the grate frame disclosed in an embodiment of the present application at one angle;

[0081] Figure 21 This is a structural schematic diagram of the grate frame disclosed in an embodiment of the present application from another angle;

[0082] Figure 22 A cross-sectional view of a grate module disclosed in an embodiment of the present application;

[0083] Figure 23 A schematic structural diagram of an anti-deflection roller device disclosed in an embodiment of the present application;

[0084] Figure 24 This is a schematic structural diagram of the movable grate beam disclosed in an embodiment of the present application.

[0085] The meanings of the reference numerals in the figures are as follows:

[0086] 101 - grate module body; 1011 - positioning legs; 102 - sliding expansion seat; 1021 - expansion seat base; 1022 - expansion seat connector; 1023 - expansion seat slide; 103 - grate support device; 1031 - support legs; 1032 - support beam; 104 - limiting guide rail;

[0087] 201-driving cylinder; 202-synchronizing shaft; 203-bearing seat; 204-bearing seat; 205-fixed support; 206-guide wheel device; 2061-guide wheel; 2062-guide wheel shaft; 2063-bearing; 207-movable grate beam; 2071-movable grate beam body; 2072-assembly; 2073-movable grate reinforcement; 208-sealing device; 2081-sealing gasket; 2082-pressure cover; 20 83-packing; 2084-third flange; 209-grate drive beam; 210-first slide; 2101-slide seat; 2102-slide body; 211-push rod crank; 212-push rod body; 213-stopper; 214-grate block; 215-cylinder crank; 216-cylinder push head; 217-second slide; 218-anti-deflection roller device; 2181-mounting bracket; 2182-support seat; 2183-anti-deflection wheel;

[0088] 301-upper frame; 302-mounting base; 303-frame lower box; 304-slanted member; 305-fixed grate beam; 3051-transverse plate reinforcement; 3052-vertical beam reinforcement; 3053-vertical plate reinforcement; 306-first frame reinforcement; 307-second frame reinforcement. DETAILED DESCRIPTION

[0089] The embodiment of the present application discloses a grate module to avoid support point breakage and improve installation reliability;

[0090] The embodiments of the present application also disclose a grate assembly and an incinerator having the above-mentioned grate module.

[0091] The following describes the embodiments with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the content of the application described in the claims. Furthermore, the entire contents of the configurations represented by the following embodiments are not limited to those necessary for the solution of the application described in the claims. It should be noted that, for ease of description, only the portions related to the relevant application are shown in the accompanying drawings. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict.

[0092] like Figure 1 、 Figure 2 and Figure 4 As shown, the grate module disclosed in the embodiment of the present application includes a grate module body 101 and a grate support device 103. The grate module body 101 is provided with positioning legs 1011, which serve as support points for the grate module body 101. Multiple positioning legs 1011 can be arranged around the center of gravity of the grate module body 101. For example, in this embodiment, four positioning legs 1011 are provided, i.e., two rows of positioning legs 1011 are arranged front and back along the direction of garbage conveying, with two positioning legs in each row. It should be noted that the actual number of positioning legs 1011 can be arranged by those skilled in the art as needed and is not limited to four.

[0093] There are multiple grate support devices 103, and they are supported at different positions of the grate module body 101. The grate support device 103 is provided with a sliding expansion seat 102, and the positioning legs 1011 are slidably fitted on the sliding expansion seat 102. The sliding expansion seat 102 and the positioning legs 1011 are arranged in a one-to-one correspondence, that is, each positioning leg 1011 needs to have a corresponding sliding expansion seat 102 arranged at the corresponding position. The positioning legs 1011 are supported on the sliding expansion seat 102, and at least in the garbage conveying direction, the sliding expansion seat 102 does not constrain the positioning legs 1011, so that after the grate module body 101 is heated and expanded, it can expand and deform along the garbage conveying direction. At this time, the positioning legs 1011 slide along the sliding expansion seat 102 to prevent the connection point from breaking due to the fixed connection between the positioning legs 1011 and the sliding expansion seat 102.

[0094] like Figure 5 and Figure 6 As shown, at least one sliding expansion seat 102 is provided with a limiting guide rail 104 that limits the sliding of the positioning legs 1011 in a direction perpendicular to the waste conveying direction. The limiting guide rail 104 can limit the sliding of the positioning legs 1011 in a direction perpendicular to the waste conveying direction, so that the expansion deformation of the grate module body 101 is completely offset in a direction parallel to the waste conveying direction, preventing the positioning legs 1011 from falling off the sliding expansion seat 102 due to excessive deformation in the direction perpendicular to the waste conveying direction.

[0095] It will be understood by those skilled in the art that the grate module bodies 101 are fixed in sequence, and both ends of the grate assembly composed of the grate module bodies 101 usually need to be fixed. Therefore, there is no need to set a limiting guide rail to limit the sliding of the positioning legs 1011 in a direction parallel to the garbage conveying direction, and the grate module body 101 will not be separated from the sliding expansion seat 102.

[0096] Since the grate module bodies 101 are connected in sequence, it is sufficient to provide the limiting guide rail 104 on only one of the sliding expansion seats 102 to constrain all the grate module bodies 101. Of course, the limiting guide rail 104 may also be provided on multiple sliding expansion seats 102, or even on all the sliding expansion seats 102.

[0097] The grate module disclosed in the embodiment of the present application is provided with a plurality of positioning legs 1011 on the grate module body 101, and a sliding expansion seat 102 is provided on the grate support device 103, and the positioning legs 1011 are slidably matched with the sliding expansion seat 102. That is, the positioning legs 1011 are not fixed to the sliding expansion seat 102, but are floatingly provided on the sliding expansion seat 102, so that when the grate module body 101 is heated and the volume expands, the positioning legs 1011 can slide along the sliding expansion seat 102, thereby preventing the risk of fracture at the connection due to different temperatures and expansion volumes. A limiting guide rail 104 is provided on the sliding expansion seat 102, which can limit the positioning legs 1011 from sliding in a direction perpendicular to the garbage conveying direction, thereby preventing the positioning legs 1011 from separating from the sliding expansion seat 102 in the above direction. In the garbage conveying direction, since the two ends of the grate assembly usually need to be fixed, there is no need to provide a limiting device on the sliding expansion seat 102.

[0098] like Figure 5-Figure 8 As shown, in a specific embodiment of the present application, the sliding expansion seat 102 includes an expansion seat base 1021, an expansion seat connector 1022 and an expansion seat slide 1023. The expansion seat connector 1022 is connected between the expansion seat base 1021 and the expansion seat slide 1023. The expansion seat connector 1022 can be a plate-shaped structure, connected between the expansion seat base 1021 and the expansion seat slide 1023 to support the expansion seat slide 1023. The shape of the expansion seat connector 1022 can be used to set the expansion seat slide 1023 at a certain angle, which is adapted to the inclination angle of the grate, so that the garbage can be moved downstream by gravity. One or more expansion seat connectors 1022 supported between the expansion seat base 1021 and the expansion seat slide 1023 can be set according to strength requirements.

[0099] The expansion seat base 1021 is fixed on the grate support device 103, and the positioning legs are slidably matched on the expansion seat slide 1023. The expansion seat base 1021 can be fixed on the grate support device 103 by fasteners. Figure 2 As shown, the grate support device 103 may include support legs 1031 and support beams 1032. The support beams 1032 are supported by a plurality of support legs 1031 ( Figure 2 In the illustrated embodiment, the support beam 1032 is supported by two support legs 1031 . The upper surface of the support beam 1032 is flat, and the expansion seat base 1021 is fixed to the upper surface of the support beam 1032 .

[0100] When the limiting guide rail 104 is provided on the sliding expansion seat 102, the limiting guide rail 104 is provided on the expansion seat slide 1023. The limiting guide rail 104 and the expansion seat slide 1023 form a guide slot for the positioning leg to slide. For example, two limiting guide rails 104 arranged in parallel can be provided on the expansion seat slide 1023, and a guide slot is formed between the two limiting guide rails 104. The positioning leg 1011 is disposed in the guide slot.

[0101] For ease of understanding, the garbage conveying direction is defined as the first direction, and the direction perpendicular to the garbage conveying direction is defined as the second direction. Along the first direction, both ends of the grate module body 101 support grate support devices 103. Along the second direction, both ends of the grate support device 103 are provided with sliding expansion seats 102, that is, each grate module body 101 is provided with four sliding expansion seats 102.

[0102] like Figure 2 and Figure 11-13 As shown, the grate module body 101 includes a grate frame, which includes an upper frame 301 and a frame lower box 303 located below the upper frame 301. It should be noted that the upper frame 301 and the frame lower box 303 do not refer to different components, but refer to parts at different positions of the grate module body 101.

[0103] The upper frame 301 supports a fixed grate beam 305, on which grate blocks 214 are mounted. Because the fixed grate beam 305 is mounted on the upper frame 301, it cannot move. Therefore, the grate blocks 214 on the fixed grate beam 305 are static grate blocks. The fixed grate beam 305 not only mounts the grate blocks 214 but also strengthens the structural strength of the grate frame.

[0104] From top to bottom, the cross-sectional area of the frame lower box 303 gradually decreases. That is, the frame lower box 303 disclosed in this embodiment is in the form of a structure with a narrowed lower portion. By narrowing the lower space of the frame lower box 303, a larger space can be formed in the narrowed area of the frame lower box 303 between two adjacent grate module bodies 101. This space can provide convenience for inspecting and repairing the drive cylinder 201, the bearing seat, etc. The frame lower box 303 is designed to have a structure that gradually narrows from top to bottom, which can meet the combination requirements of multiple grate module bodies 101, so that sufficient inspection space is formed in the aisle between two adjacent grate module bodies 101, which is convenient for the inspection and repair of the equipment. In addition, the reserved inspection space can also form a heat dissipation channel to avoid high temperature and overheating between the grate module bodies 101.

[0105] For ease of understanding, the plane containing the axes of the fixed grate beams 305 is defined as a reference plane. The angle θ between the sidewalls of the frame lower box 303 and the reference plane is 40°-70° (inclusive). The narrowing portion of the frame lower box 303 can be a truncated pyramid structure, having four opposing inclined surfaces. Each inclined surface has an angle θ with the reference plane. This means that the angle between each inclined surface and the reference plane can be selected from 40°-70°, for example, 40°, 45°, 50°, 55°, 60°, 65°, 70°, and so on. The angles between each inclined surface and the reference plane can be equal or different depending on the needs. This embodiment does not limit the specific angles between each inclined surface and the reference plane.

[0106] like Figure 20 and Figure 21 As shown, the grate frame is provided with frame reinforcement ribs, and the fixed grate beam 305 is provided with fixed grate reinforcement ribs. The garbage load is transmitted through the fixed grate beam 305 and the movable grate beam 207. The load on the fixed grate beam 305 is transmitted to the positioning legs 1011 through the frame sidewalls and frame reinforcement ribs on the grate frame, and ultimately transmitted from the positioning legs 1011 to the sliding expansion seat 102. This embodiment adds frame reinforcement ribs and fixed grate reinforcement ribs to the force transmission path of the fixed grate beam 305 to improve its strength, prevent deformation of the corresponding stress-bearing parts, and extend the service life of the grate module body 101.

[0107] Furthermore, the frame reinforcement ribs may include first frame reinforcement ribs 306 arranged on the outer wall of the grate frame and second frame reinforcement ribs 307 arranged on the inner wall of the grate frame. That is, in this embodiment, frame reinforcement ribs are provided on both the inner and outer walls of the grate frame to facilitate force transmission. For example, the first frame reinforcement ribs 306 may be located on the lower frame box 303, but this does not preclude the provision of the first frame reinforcement ribs 306 on the upper frame 301. Accordingly, the second frame reinforcement ribs 307 are located on the upper frame 301, but this does not preclude the provision of the second frame reinforcement ribs 307 on the lower frame box 303.

[0108] In this embodiment, the second frame reinforcement rib 307 is provided on the inner wall of the upper frame 301, and the upper frame 301 is the area supporting the fixed grate beam 305. Therefore, the second frame reinforcement rib 307 is provided on the upper frame 301, so that the fixed grate reinforcement rib can be directly connected to the second frame reinforcement rib 307 to improve the strength of the connection between the fixed grate beam 305 and the grate frame and prevent deformation of the connection.

[0109] The garbage load acts on the fixed grate beam 305 through the grate block 214. The force of the fixed grate beam 305 acts on the upper frame 301 and the second frame reinforcement 307 of the upper frame 301 through itself and the fixed grate reinforcement, and continues to be transmitted downward to the frame lower box 303 and the first frame reinforcement 306 on the frame lower box 303, and is finally transmitted to the sliding expansion seat 102 by the positioning leg 1011.

[0110] The fixed grate reinforcement ribs may include horizontal plate reinforcement ribs 3051, vertical plate reinforcement ribs 3053, and vertical beam reinforcement ribs 3052. The horizontal plate reinforcement ribs 3051 are parallel to the fixed grate beam 305 and spaced apart. The vertical plate reinforcement ribs 3053 are connected to the horizontal plate reinforcement ribs 3051 and the fixed grate beam 305. The horizontal plate reinforcement ribs 3051 and the vertical plate reinforcement ribs 3053 may be arranged perpendicular to each other.

[0111] The vertical beam reinforcement ribs 3052 connect the horizontal plate reinforcement ribs 3051 , the fixed grate beam 305 and the vertical plate reinforcement ribs 3053 . There are a plurality of vertical beam reinforcement ribs 3052 arranged at intervals along the extending direction of the fixed grate beam 305 .

[0112] It should be noted that the specific solution for fixing the grate reinforcement ribs disclosed in the above embodiment is only an example, and those skilled in the art can design a specific structure for fixing the grate reinforcement ribs according to needs.

[0113] like Figure 3 As shown, in a specific embodiment of the present application, the grate module body 101 includes a movable grate assembly, and the driving source of the movable grate assembly is a driving cylinder 201. The driving cylinder 201 can be a hydraulic cylinder or other driving device as long as it can drive the movable grate assembly to move.

[0114] like Figure 11 、 Figure 14 and Figure 15 As shown, a mounting base 302 is fixed to the outside of the grate frame. The drive cylinder 201 is hingedly connected to the mounting base 302. The mounting base 302 is located on the underside of the frame's lower housing 303, so that the drive cylinder 201 is located in the narrowed area below the frame's lower housing 303. The narrowed area below the frame's lower housing 303 provides ample space for the drive cylinder 201. The area where the drive cylinder 201 is located is located on the underside of the frame's lower housing 303, away from the combustion surface of the grate above, preventing excessively high ambient temperatures that could affect the lifespan of the drive cylinder 201.

[0115] like Figure 2 As shown, when multiple grate modules are arranged perpendicular to the conveying direction of the garbage, Figure 2In the illustrated solution, four rows of grate modules are arranged along a direction perpendicular to the garbage conveying direction, and at most one driving cylinder 201 is arranged between any two adjacent grate modules (that is, between any two adjacent grate modules along a direction perpendicular to the garbage conveying direction).

[0116] by Figure 2 For example, the drive cylinders 201 of the two grate modules on the left are both located on the left side of the grate module, while the drive cylinders 201 of the two grate modules on the right are both located on the right side of the grate module. This arrangement ensures that there is at most one drive cylinder 201 between any two adjacent grate modules, and there is no drive cylinder 201 between the two grate modules in the middle. Those skilled in the art can arrange the positions of the drive cylinders 201 on the grate modules as needed, as long as there is no more than one drive cylinder 201 between two grate modules.

[0117] When at most one driving cylinder 201 is set between two grate modules, it can be ensured that there is enough space between the two grate modules in the area of the lower box 303 of the frame. Even if setting one driving cylinder 201 will take up some space, the remaining space can still meet maintenance and heat dissipation requirements.

[0118] like Figure 15 As shown, a diagonal brace 304 can be provided between the mounting base 302 and the grate frame. The diagonal brace 304 can increase the supporting strength of the mounting base 302, ensuring that when the driving cylinder 201 on the mounting base 302 outputs the driving force, the mounting base 302 can provide sufficient support for the driving cylinder 201, thereby preventing the mounting base 302 from being deformed or broken, and improving the reliability of the movable grate assembly during operation.

[0119] In a specific embodiment of the present application, each grate module is provided with only one driving cylinder 201, and the movable grate block assembly of the movable grate assembly is driven to move by a synchronization mechanism to ensure synchronization of the movement of the movable grate block assembly.

[0120] like Figure 3 As shown, the movable grate block assembly includes two grate driving beams 209 that are slidably fitted in the grate frame, and a movable grate beam 207 supported on the two grate driving beams 209. Grate blocks 214 are provided on the movable grate beam 207. The grate blocks 214 provided on the movable grate beam 207 are movable grate blocks, and the movable grate blocks and the static grate blocks are arranged alternately.

[0121] The movable grate beam 207 is supported at both ends by two parallel grate drive beams 209. The drive cylinder 201 drives the two grate drive beams 209 to move synchronously via a synchronization mechanism. The drive cylinder 201 activates the synchronization mechanism, which in turn drives the two movable grate beams 207 to move synchronously, thereby driving the movable grate beams 207 and the movable grate blocks on the two movable grate beams 207 to move.

[0122] Compared with the prior art, each grate drive beam 209 is driven by a drive cylinder 201, and then the hydraulic control system is used to make the output actions of the two drive cylinders 201 consistent, so that the two grate drive beams 209 are synchronized, but the actual synchronization is affected by the hydraulic system and the synchronization is poor.

[0123] The embodiment of the present application only provides one driving cylinder 201, which is arranged on a single side of the grate module body 101. Then, through a synchronization mechanism, the power output by the driving cylinder 201 is synchronously transmitted to the two grate driving beams 209, so as to avoid inconsistent movement of the two ends of the moving grate block, offset during movement, and deformation of the grate frame.

[0124] like Figure 3 As shown, in a specific embodiment of the present application, the synchronization mechanism may include a synchronization shaft 202, a cylinder crank 215, and a crank-connecting rod mechanism. The synchronization shaft 202 is rotatably supported on the grate frame, the cylinder crank 215 is fixed to the synchronization shaft 202, and one end of the drive cylinder 201 is hinged to the mounting base 302, while the other end is hinged to the cylinder crank 215 via a cylinder pusher 216. When the piston rod of the drive cylinder 201 is extended, it can drive the cylinder crank 215 to rotate the synchronization shaft 202 in a first rotational direction. When the piston rod of the drive cylinder 201 is retracted, it can drive the cylinder crank 215 to rotate the synchronization shaft 202 in a second rotational direction.

[0125] There are two crank-connecting rod mechanisms, one corresponding to each of the two grate drive beams 209. The two crank-connecting rod mechanisms share identical structures. They include a push rod crank 211 and a push rod body 212. The push rod crank 211 is fixed to the synchronizing shaft 202. The push rod body 212 is hinged to the push rod crank 211 at one end and to the grate drive beam 209 at the other.

[0126] When the piston rod of the drive cylinder 201 extends, it drives the cylinder crank 215 to rotate the synchronous shaft 202 in a first rotational direction. The synchronous shaft 202 drives the push rod crank 211 to rotate in the first rotational direction. The push rod crank 211 pushes the push rod body 212 to swing, and simultaneously drives the grate drive beam 209 to move to the right (i.e., drives the grate drive beam 209 to move in the forward direction of the garbage conveying direction). When the piston rod of the drive cylinder 201 retracts, it drives the cylinder crank 215 to rotate the synchronous shaft 202 in a second rotational direction. The synchronous shaft 202 drives the push rod crank 211 to rotate in the second rotational direction. The push rod crank 211 pushes the push rod body 212 to swing, and simultaneously drives the grate drive beam 209 to move to the left (i.e., drives the grate drive beam 209 to move in the backward direction of the garbage conveying direction).

[0127] like Figure 2 、 Figure 10 、 Figure 17-Figure 19 As shown, in a specific embodiment of the present application, a fixed support 205 is provided in the grate frame, a guide wheel device 206 is provided on the fixed support 205, a first slide 210 is provided on the grate driving beam 209, and the guide wheel device 206 and the first slide 210 are in rolling cooperation.

[0128] Two sets of guide wheel assemblies 206, supported by fixed supports 205, are positioned along the grate drive beam 209's direction of motion, i.e., at the front and rear ends of the grate frame. The grate drive beam 209, connected to the movable grate beam 207, rests on the guide wheel assemblies 206. As the grate drive beam 209 moves, a first slide 210 fixed to the grate drive beam 209 moves along the guide wheel assemblies 206. The guide wheel assemblies 206 rotate with the movement of the first slide 210, reducing friction and guiding the movement of the grate drive beam 209.

[0129] like Figure 3 and Figure 10 As shown, a limiter 213 is installed within the grate frame, and a second slide 217 is installed on the grate drive beam 209, opposite the limiter 213. The surface of the limiter 213 and the surface of the second slide 217 are parallel and separated by a predetermined distance. The limiter 213 is located at the rear end of the grate frame (i.e., upstream in the direction of waste conveying) to prevent the grate drive beam 209 from tilting and colliding during its backward movement (i.e., moving upstream in the direction of waste conveying).

[0130] like Figure 17-Figure 19As shown, the guide wheel device 206 includes a guide wheel shaft 2062 supported on the fixed support 205 and a guide wheel 2061 rotatably sleeved on the guide wheel shaft 2062. In order to improve the smoothness of the rotation of the guide wheel 2061, a bearing 2063 is provided between the guide wheel shaft 2062 and the guide wheel 2061, and the bearing 2063 can be a self-lubricating bearing.

[0131] A limiting groove is provided on the wheel surface of the guide wheel 2061, that is, a limiting groove is provided on the outer peripheral surface of the guide wheel 2061, and the two side walls of the limiting groove can limit the first slide 210 to limit the axial position of the first slide 210 on the guide wheel device 206.

[0132] The first slide 210 includes a slide base 2101 and a slide body 2102 mounted on the slide base 2101 and engaging with the retaining groove of the guide wheel 2061. The slide base 2101 is fixed to the grate drive beam 209. The slide body 2102 extends into the retaining groove. The side walls of the retaining groove restrict the slide body 2102's axial position with respect to the guide wheel 2061, thus limiting the grate drive beam 209 to move in a specific direction.

[0133] like Figure 9 As shown, both ends of the synchronization shaft 202 are rotatably supported on the grate frame through bearing seats. The synchronization shaft 202 crosses both sides of the grate frame, and a bearing seat 203 with a fixed end (i.e., the end with the drive cylinder 201) is provided on one side, and a bearing seat 204 with a free end (i.e., the end without the drive cylinder 201) is provided on the other side.

[0134] A sealing device 208 is provided at the junction of the grate frame and the synchronous shaft 202 to provide a sealing protection. Figure 16 As shown, the sealing device 208 may include a sealing gasket 2081, a packing 2083, and a gland 2082. The sealing gasket 2081 is sleeved on the synchronous shaft 202 and includes a first flange portion, a sleeve portion, and a sealing portion. The first flange portion is fixed to the grate frame, for example, to the frame lower housing 303. The sleeve portion and the sealing portion are sleeved on the synchronous shaft 202, and a sealed space is formed between the sleeve portion and the synchronous shaft 202.

[0135] Packing 2083 is positioned within the sealed space, with its first end restrained by a sealing portion. Gland 2082 includes a second flange and a restraining portion. The second flange is secured to the first flange, which is inserted into the sealed space. The second end of packing 2083 is restrained by the restraining portion. The second flange can be secured to the first flange via fasteners. To facilitate connection between the first flange and the grate frame, a third flange 2084 is provided on the grate frame. The first flange and third flange 2084 can be connected via fasteners.

[0136] like Figure 22 and Figure 23 As shown, in a specific embodiment of the present application, the grate module body 101 includes a movable grate block assembly, which includes a grate drive beam 209 that slides into the grate frame, and movable grate beams 207 supported on the grate drive beam 209. The movable grate beams 207 are used to support grate blocks 214. The grate drive beam 209 drives each movable grate beam 207 to move, thereby realizing the movement of the grate blocks 214 on the movable grate beams 207.

[0137] An anti-deflection roller device 218 is installed within the grate frame, and the anti-deflection wheel 2183 of the anti-deflection roller device 218 abuts the grate drive beam 209. The anti-deflection roller device 218 is arranged on one side of the grate drive beam 209, so that the grate drive beam 209 always sticks to the anti-deflection wheel 2183 during reciprocating movement, preventing the grate drive beam 209 from deviating from its movement path and improving user safety.

[0138] The anti-deflection roller device 218 is installed at a different location from the guide wheel device 206. The guide wheel device 206 is installed on the lower side of the grate drive beam 209 to support the grate drive beam 209. The anti-deflection roller device 218 is installed on the outer side wall of the grate drive beam 209. The weight of the grate drive beam 209 does not act on the anti-deflection roller device 218. Only when the grate drive beam 209 deflects in a direction perpendicular to the direction of movement will it be affected by the anti-deflection roller device 218 to prevent the grate drive beam 209 from deviating from the established movement path.

[0139] The anti-skew roller device 218 has a similar structure to the guide wheel device 206 and includes a mounting bracket 2181, a support base 2182, and an anti-skew roller 2183. The support base 2182 is fixed to the mounting bracket 2181, and the anti-skew roller 2183 is rotatably supported on the support base 2182 via the anti-skew roller axle. To improve the smoothness of the rotation of the anti-skew roller 2183, a bearing is provided between the anti-skew roller axle and the anti-skew roller 2183. This bearing can be a self-lubricating bearing. The mounting bracket 2181 is used to fix to the grate frame. To improve the reliability of the fixation, the mounting bracket 2181 can be provided with reinforcing ribs.

[0140] like Figure 24As shown, the movable grate beam 207 may include a movable grate beam body 2071, an assembly 2072, and movable grate reinforcement ribs 2073. The movable grate beam body 2071 is used to support the grate blocks 214, and the assembly 2072 is connected to the movable grate beam body 2071. The assembly 2072 may be welded to the movable grate beam body 2071 or may be designed as an integral structure with the movable grate beam body 2071. The assembly 2072 is used to connect to the grate drive beam 209. Specifically, the assembly 2072 may be connected to the grate drive beam 209 via fasteners, but it may also be connected to the grate drive beam 209 via other means.

[0141] Active grate reinforcement ribs 2073 are installed on active grate beam body 2071 and connected to assembly 2072. The garbage load acts on active grate beam 207 through grate block 214. These reinforcement ribs 2073 increase the strength of active grate beam 207, enabling it to withstand greater loads and preventing disturbances.

[0142] The force of the movable grate beam 207 acts on the guide wheel assembly 206 through the grate drive beam 209, and then acts on the lower frame box 303 and the first frame reinforcement rib 306 on the lower frame box 303 through the guide wheel assembly 206, and is ultimately transmitted to the sliding expansion seat 102 through the positioning legs 1011. The grate module disclosed in this embodiment, whether it is the fixed grate beam 305 or the movable grate beam 207, has a relatively reasonable force transmission path, and the force-bearing parts have been correspondingly strengthened, thereby extending the service life of the equipment.

[0143] The present application also discloses a grate assembly comprising at least one grate module row, each grate module row comprising multiple grate modules arranged along the direction of waste conveyance. The grate modules are the grate modules disclosed in the above embodiments. If there are multiple grate module rows, each grate module row is arranged perpendicular to the direction of waste conveyance. The grate assembly disclosed in the present application, because it includes the above-described grate modules, combines all the technical advantages of the above-described grate modules and will not be further described herein.

[0144] The embodiment of the present application discloses an incinerator, which includes the grate assembly disclosed in the above embodiment. The incinerator disclosed in the embodiment of the present application has all the technical effects of the above grate assembly due to the grate assembly, which will not be described in detail here.

[0145] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0146] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0147] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0148] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A grate module, characterized in that: include: A grate module body (101), wherein the grate module body (101) is provided with positioning legs (1011); A grate support device (103), wherein the grate support devices (103) are multiple and supported at different positions on the grate module body (101), a sliding expansion seat (102) is provided on the grate support device (103), the positioning legs (1011) are slidably engaged with the sliding expansion seat (102), and at least one of the sliding expansion seats (102) is provided with a limiting guide rail (104) for limiting the sliding of the positioning legs (1011) in a direction perpendicular to the garbage conveying direction.

2. The grate module according to claim 1, characterized in that The sliding expansion seat (102) comprises an expansion seat base (1021), an expansion seat connector (1022) and an expansion seat slide plate (1023), wherein the expansion seat connector (1022) is connected between the expansion seat base (1021) and the expansion seat slide plate (1023); The expansion seat base (1021) is fixed on the grate support device (103), and the positioning legs (1011) are slidably fitted on the expansion seat slide (1023); When the limiting guide rail (104) is provided on the sliding expansion seat (102), the limiting guide rail (104) is provided on the expansion seat slide plate (1023), and the limiting guide rail (104) and the expansion seat slide plate (1023) form a guide groove for the positioning leg (1011) to slide.

3. The grate module according to claim 1, wherein: Along the first direction, both ends of the grate module body (101) are supported by the grate supporting devices (103); Along the second direction, both ends of the grate support device (103) are provided with the sliding expansion seats (102), the first direction is perpendicular to the second direction, and the first direction is the garbage conveying direction.

4. The grate module according to any one of claims 1 to 3, characterized in that: The grate module body (101) comprises a grate frame, the grate frame comprising an upper frame (301) and a frame lower box (303) located below the upper frame (301), a fixed grate beam (305) supported on the upper frame (301), and a grate block (214) provided on the fixed grate beam (305); From top to bottom, the cross-sectional area of the frame lower box (303) gradually decreases.

5. The grate module according to claim 4, characterized in that: The plane where the axis of each fixed grate beam (305) is located is a reference plane, and the angle between the side wall of the frame lower box (303) and the reference plane is θ, and the angle θ is 40°-70°.

6. The grate module according to claim 4, characterized in that: The grate frame is provided with frame reinforcement ribs; and / or; The fixed grate beam (305) is provided with fixed grate reinforcement ribs.

7. The grate module according to claim 6, characterized in that: The frame reinforcement ribs include first frame reinforcement ribs (306) arranged on the outer side wall of the grate frame and second frame reinforcement ribs (307) arranged on the inner side wall of the grate frame.

8. The grate module according to claim 7, characterized in that: The first frame reinforcement rib (306) is located on the frame lower box (303), the second frame reinforcement rib (307) is located on the upper frame (301), and the fixed grate reinforcement rib is connected to the second frame reinforcement rib (307).

9. The grate module according to claim 6, characterized in that: The fixed grate reinforcement ribs include: Transverse plate reinforcement ribs (3051) parallel to the fixed grate beam (305) and arranged at intervals; connecting the horizontal plate reinforcement ribs (3051) and the vertical plate reinforcement ribs (3053) of the fixed grate beam (305); A vertical beam reinforcement rib (3052) connecting the horizontal plate reinforcement rib (3051), the fixed grate beam (305) and the vertical plate reinforcement rib (3053) is provided. The vertical beam reinforcement rib (3052) is a plurality of ribs arranged at intervals along the extension direction of the fixed grate beam (305).

10. The grate module according to claim 4, characterized in that: The grate module body (101) comprises a movable grate assembly, and the driving source of the movable grate assembly is a driving cylinder (201); A mounting base (302) is fixed on the outer side of the grate frame, the driving cylinder (201) is hinged on the mounting base (302), and the mounting base (302) is located on the lower side of the frame lower box (303), so that the driving cylinder (201) is located in the narrowed area on the lower side of the frame lower box (303).

11. The grate module according to claim 10, wherein: In the case where a plurality of the grate modules are arranged perpendicular to the conveying direction of the garbage, at most one driving cylinder (201) is arranged between any two adjacent grate modules; and / or, A diagonal bracing member (304) is provided between the mounting base (302) and the grate frame.

12. The grate module according to claim 10, wherein: There is one driving cylinder (201), which drives the movable grate block assembly of the movable grate assembly to move through a synchronization mechanism. The movable grate block assembly includes two grate driving beams (209) that are slidably fitted in the grate frame, and a movable grate beam (207) supported on the two grate driving beams (209). The movable grate beam (207) is provided with a grate block (214). The driving cylinder (201) drives the two grate driving beams (209) to move synchronously via the synchronization mechanism.

13. The grate module according to claim 12, wherein: The synchronization mechanism includes: A synchronization shaft (202) rotatably supported on the grate frame; A cylinder crank (215) is fixed on the synchronization shaft (202); one end of the driving cylinder (201) is hinged to the mounting base (302), and the other end is hinged to the cylinder crank (215); The crank-connecting rod mechanism is a pair of crank-connecting rod mechanisms corresponding to the two grate drive beams (209) on a one-to-one basis, and the push rod crank (211) of the crank-connecting rod mechanism is fixed on the synchronization shaft (202), and the push rod body (212) of the crank-connecting rod mechanism is hinged to the grate drive beam (209).

14. The grate module according to claim 12, wherein: A fixed support (205) is provided in the grate frame, a guide wheel device (206) is provided on the fixed support (205), a first slide plate (210) is provided on the grate drive beam (209), and the guide wheel device (206) and the first slide plate (210) are in rolling cooperation; and / or, A limiter (213) is provided in the grate frame, and a second slide plate (217) arranged opposite to the limiter (213) is provided on the grate driving beam (209). The plate surface of the limiter (213) is parallel to the plate surface of the second slide plate (217), and the plates are separated by a preset distance.

15. The grate module according to claim 14, wherein: A limiting groove is provided on the wheel surface of the guide wheel (2061) of the guide wheel device (206); the first slide plate (210) comprises a slide plate seat (2101) and a slide plate body (2102) provided on the slide plate seat (2101) and cooperating with the limiting groove of the guide wheel (2061); the slide plate seat (2101) is fixed on the grate driving beam (209).

16. The grate module according to claim 13, wherein: Both ends of the synchronization shaft (202) are rotatably supported on the grate frame via bearing seats, and a sealing device (208) is provided at the junction of the grate frame and the synchronization shaft (202).

17. The grate module according to claim 16, wherein: The sealing device (208) comprises: a sealing gasket (2081), the sealing gasket (2081) comprising a first flange portion, a sleeve portion, and a sealing portion, the first flange portion being fixed to the grate frame, the sleeve portion and the sealing portion being sleeved on the synchronous shaft (202), and forming a sealed space between the sleeve portion and the synchronous shaft (202); A packing (2083) is arranged in the sealed space, and a first end thereof is limited by the blocking portion; The pressure cover (2082) includes a second flange portion and a limiting portion, the second flange portion is fixed on the first flange portion, the limiting portion is inserted into the sealed space, and the second end of the packing (2083) is limited by the limiting portion.

18. The grate module according to claim 4, wherein: The grate module body (101) comprises a movable grate block assembly, wherein the movable grate block assembly comprises a grate driving beam (209) slidingly fitted in the grate frame, and a movable grate beam (207) supported on the grate driving beam (209); An anti-deflection roller device (218) is provided in the grate frame, and an anti-deflection wheel (2183) of the anti-deflection roller device (218) abuts against the grate drive beam (209).

19. The grate module according to claim 18, wherein: The movable grate beam (207) comprises: A movable grate beam body (2071) for supporting the grate block (214); an assembly (2072) connected to the movable grate beam body (2071), the assembly (2072) being used to connect to the grate drive beam (209); The movable grate reinforcement rib (2073) is arranged on the movable grate beam body (2071) and connected to the assembly body (2072).

20. A grate assembly, characterized in that: It comprises at least one column of grate modules, each column of the grate modules comprises a plurality of grate modules arranged along the garbage conveying direction, and the grate modules are the grate modules according to any one of claims 1-19.

21. The grate assembly of claim 20, wherein: The grate modules are arranged in multiple rows, and each row of the grate modules is arranged perpendicular to the garbage conveying direction.

22. An incinerator, characterized in that: Comprising a grate assembly as claimed in claim 20 or 21.

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