An adjustable modular grate cooler for lithium ore smelting plants

Abstract

The invention discloses an adjustable modular grate cooler for lithium ore smelting plant, belonging to the technical field of grate coolers. An adjustable modular grate cooler for lithium ore smelting plant comprises an adjustable grate bed, a support frame and a modular frame, a lifting hydraulic cylinder A is fixedly connected to the left side of the top of the support frame, a support seat is fixedly connected to the right side of the top of the support frame, the top of the lifting hydraulic cylinder A and the top of the support seat are connected to the bottom of the adjustable grate bed, a discharge assembly is movably connected to the top of the adjustable grate bed, the A module frame is fixedly connected to the B module frame and the C module frame in sequence, an adjusting hydraulic rod is connected to the bottom of the three module frames, and a tugboat assembly is fixedly connected inside them, a road beam assembly is respectively arranged on the top of the tugboat assembly, and the bottom of the right side of the adjustable grate bed is overlapped with the road beam assembly on the A module frame; the device can be used in lithium ore smelting plants, the modular design facilitates equipment installation, and the equipment can effectively push away clinker and timely clean up snowmen accumulated on the adjustable grate bed.

Description

Technical Field

[0001] The invention relates to the field of grate coolers, and more specifically to an adjustable modular grate cooler for a lithium ore smelting plant. Background Art

[0002] Grate cooler is an important main equipment in the clinker burning system of cement plant. Its main function is to cool and transport cement clinker. At the same time, it provides hot air for rotary kiln and decomposition furnace, and is the main equipment for heat recovery in the burning system.

[0003] At present, lithium ore smelters do not have dedicated grate cooling equipment. Most of the grate coolers used by lithium ore smelters on the market are directly modified from the grate coolers in the cement production industry. These devices are difficult to meet the transportation and cooling needs of lithium ore clinker. In addition, the existing equipment has many parts and components, which makes the equipment installation cycle long; during the use of the equipment, the clinker at the front end of the grate cooler is easy to sinter to form a snowman. In order to solve this problem, the existing design often solves this problem by adding a "snowman pushing" device, which increases the cost of factory construction; in order to solve the above problems, the present invention proposes an adjustable modular grate cooler for lithium ore smelters. Summary of the invention

[0004] 1. Technical problems to be solved

[0005] In view of the above problems existing in the prior art, the problems are as follows:

[0006] (1) Currently, lithium ore smelters do not have dedicated grate cooling equipment, and the grate coolers adapted from the cement production industry are difficult to meet the transportation and cooling requirements of lithium ore clinker;

[0007] (2) The existing equipment has many parts and components, which makes the equipment installation cycle longer;

[0008] (3) Clinker is easy to sinter and form a snowman at the front end of the grate cooler, and the existing snowman-pushing device increases the construction cost of the factory.

[0009] 2. Technical solution

[0010] To solve the above problems, the present invention adopts the following technical solutions.

[0011] An adjustable modular grate cooler for lithium ore smelting plant, comprising an adjustable grate bed, a support frame and a modular frame, wherein a lifting hydraulic cylinder A is fixedly installed at an edge of one side of the top of the support frame, a support seat is fixedly connected to the top of the support frame relative to the side of the lifting hydraulic cylinder A, the top of the lifting hydraulic cylinder A is fixedly connected to the left side of the bottom of the adjustable grate bed, and the top of the support seat is rotatably connected to the side wall of the adjustable grate bed; a discharge assembly is connected to the middle position of the top of the adjustable grate bed; the modular frame comprises an A module frame, a B module frame and a C module frame, the A module frame, the B module frame and the C module frame are fixedly connected to one side of the support frame in sequence, the height of the modular frame is lower than the adjustable grate bed, and the bottoms of the A module frame, the B module frame and the C module frame are all provided with adjustable A hydraulic rod, the top of the telescopic rod of the adjustable hydraulic rod is movably connected to the frame of the A module frame, the B module frame and the C module frame; the adjacent connecting side walls of the A module frame, the B module frame and the C module frame are fixedly connected with wind chamber partition walls, the A module frame, the B module frame and the C module frame are all fixedly connected with tugboat assemblies, the tops of the tugboat assemblies are respectively connected with beam assemblies, and the adjacent beam assemblies are fixedly connected; a transmission device is installed in the middle position of the B module frame, the C module frame is connected with a guide wheel assembly, the guide wheel assembly is rollingly connected to the bottom of the beam assembly, and the transmission device is fixedly connected to the bottom of the beam assembly of the B module frame; the right bottom of the adjustable grate bed overlaps the left top of the beam assembly on the A module frame.

[0012] Preferably, the road beam assembly includes a push plate, a sunken labyrinth grate plate, an H-shaped sealing cover, an L-shaped seal and an H-shaped steel. The sunken labyrinth grate plate is arranged above the H-shaped steel and is arranged longitudinally. The L-shaped seal and the H-shaped sealing cover are respectively arranged on both sides above the sunken labyrinth grate plate. The push plate is arranged above the middle position between two adjacent sunken labyrinth grate plates. The push plate, the sunken labyrinth grate plate, the H-shaped sealing cover, the L-shaped seal and the H-shaped steel are fixedly connected by a bolt assembly.

[0013] Preferably, the unloading assembly includes a unloading frame, a movable shaft, a connecting rod and a lifting hydraulic cylinder B. The movable shaft is fixedly connected to the unloading frame, and the unloading frame is movably connected to the adjustable grate bed through the movable shaft. The top end of the connecting rod is rotatably connected to the side of the bottom of the unloading frame away from the movable shaft. The end of the connecting rod away from the unloading frame is rotatably connected to the top of the lifting hydraulic cylinder B, and the bottom of the lifting hydraulic cylinder B is fixedly connected to the middle position of the top of the support frame.

[0014] Preferably, a sealing asbestos board and a heat-resistant sealing board are fixedly connected to the bottom of the adjustable grate bed, and the sealing asbestos board is arranged on one side of the modular frame.

[0015] Preferably, the sunken maze-type grate plate includes a positioning plate and a ventilation plate assembly, the positioning plates are distributed on both sides of the ventilation plate assembly, both ends of the positioning plate and the ventilation plate assembly are respectively connected with a fixing plate, the top of the fixing plate is fixedly connected with a side baffle, and the positioning plate is provided with a mounting hole near the outer edge side.

[0016] Preferably, the ventilation plate assembly includes an upper ventilation plate, a lower ventilation plate and an air inlet, the upper ventilation plate and the lower ventilation plate are both made of equilateral angle steel, the upper ventilation plate and the lower ventilation plate are arranged in a positive and negative direction and are welded and fixed to the inner wall of the fixed plate; the air inlet is connected to both sides with an air outlet channel, and the air outlet channel is connected to the air outlet at one end away from the air inlet.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The present invention is provided with an adjustable grate bed, a lifting hydraulic cylinder A, a modular frame and an adjustable hydraulic rod structure. The lifting hydraulic cylinder A is connected to the adjustable grate bed, and each modular frame is connected to the adjustable hydraulic rod, so that the angle of the adjustable grate bed and the ditch beam assembly can be adjusted, and the fluidity of the clinker is used to solve the problem of poor lithium ore clinker conveying capacity;

[0020] (2) The present invention is provided with an adjustable grate bed, a support frame, an A module frame, a B module frame, a C module frame and a beam assembly structure. When the equipment is installed on site, the various components can be positioned and assembled with each other, thereby solving the problem that the existing equipment has many parts and components and a long equipment installation period;

[0021] (3) The present invention is provided with a discharge assembly structure, which is movably connected to the adjustable grate bed. When the clinker on the adjustable grate bed is sintered and piled up into a snowman, the discharge assembly can be used to clean up the snowman in time, thereby solving the problem of increasing the factory construction cost due to the addition of a snowman pushing device;

[0022] (4) The present invention is provided with a guide wheel assembly structure, and the guide wheel assembly is roll-connected to the bottom of the track beam assembly to prevent the track beam assembly from deflecting;

[0023] (5) The main body of the beam assembly of the present invention is made of H-shaped steel, which greatly reduces the welding workload of the beam and can shorten the production cycle of the equipment;

[0024] (6) The track beam assembly of the present invention is provided with an H-shaped sealing cover, an L-shaped sealing member, a push plate and a sinking labyrinth grate plate structure. The H-shaped sealing covers and L-shaped sealing members of adjacent track beam assemblies are nested with each other, and the sinking labyrinth grate plate and the push plate form a box space, which can store part of the clinker without moving, thereby solving the leakage of fine powder in the clinker;

[0025] (7) The present invention is provided with a sealing asbestos board and a heat-resistant sealing board structure, so as to achieve the purpose of sealing between the adjustable grate bed and the duct beam assembly and prevent clinker leakage;

[0026] (8) The present invention proposes an innovative ventilation plate assembly, wherein the ventilation plate is arranged in a "V" shape, and can be directly welded and stacked using steel angle steels without the need for bending the steel plates, thereby optimizing the processing technology, reducing the processing cycle and thus reducing the production cost; currently, the existing ventilation plates on the market mostly adopt a "U"-shaped design. In comparison, the "V"-shaped design of the present invention does not need to be limited by the minimum bending angle of the steel plate, and can arrange as many angle steels as possible, thereby increasing the number of grate seams to increase the ventilation area;

[0027] (9) The present invention can appropriately increase or decrease the number of modules according to the actual output demand and on-site space size of the lithium ore smelter, and has strong adaptability to different usage environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 is a cross-sectional view of the present invention;

[0030] Figure 3 It is a structural diagram of the unloading assembly of the present invention;

[0031] Figure 4 It is a schematic diagram of the road beam assembly of the present invention;

[0032] Figure 5 It is a partial schematic diagram of the adjustable grate bed of the present invention;

[0033] Figure 6 This is a structural diagram of the sinking labyrinth grate plate of the present invention;

[0034] Figure 7 It is a cross-sectional view of the sinking labyrinth grate plate of the present invention.

[0035] Description of the numbers in the figure:

[0036] 1. Adjustable grate bed; 2. Support seat; 3. Lifting hydraulic cylinder A; 4. Support frame; 5. Adjusting hydraulic rod; 6. A module frame; 7. B module frame; 8. C module frame; 9. Unloading assembly; 10. Beam assembly; 11. Tug assembly; 12. Transmission device; 13. Air chamber partition wall; 14. Guide wheel assembly; 15. Unloading rack; 16. Movable shaft; 17. Connecting rod; 18. Lifting hydraulic cylinder B; 19 , sealing asbestos board; 20, heat-resistant sealing plate; 21, pushing plate; 22, sinking labyrinth grate plate; 23, H-type sealing cover; 24, L-type sealing; 25, bolt assembly; 26, H-shaped steel; 27, positioning plate; 28, side baffle; 29, ventilation plate assembly; 30, fixing plate; 31, mounting hole; 32, upper ventilation plate; 33, lower ventilation plate; 34, air inlet; 35, air outlet channel; 36, air outlet. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] See also Figure 1-7, an adjustable modular grate cooler for lithium ore smelting plant, comprising an adjustable grate bed 1, a support frame 4 and a modular frame, a lifting hydraulic cylinder A3 is fixedly installed at the edge of one side of the top of the support frame 4, a support seat 2 is fixedly connected to the top of the support frame 4 relative to the side of the lifting hydraulic cylinder A3, the top of the lifting hydraulic cylinder A3 is fixedly connected to the left side of the bottom of the adjustable grate bed 1, and the top of the support seat 2 is rotatably connected to the side wall of the adjustable grate bed 1; a discharge assembly 9 is connected to the middle position of the top of the adjustable grate bed 1; the modular frame comprises an A module frame 6, a B module frame 7 and a C module frame 8, the A module frame 6, the B module frame 7 and the C module frame 8 are fixedly connected to one side of the support frame 4 in sequence, the height of the modular frame is lower than the adjustable grate bed 1, and the bottom ends of the A module frame 6, the B module frame 7 and the C module frame 8 are all provided with an adjusting hydraulic rod 5, and the adjusting The top of the telescopic rod of the hydraulic rod 5 is movably connected to the frame of the A module frame 6, the B module frame 7 and the C module frame 8; the wind chamber partition wall 13 is fixedly connected to the adjacent connecting side walls of the A module frame 6, the B module frame 7 and the C module frame 8, and the tugboat assembly 11 is fixedly connected inside the A module frame 6, the B module frame 7 and the C module frame 8, and the top of the tugboat assembly 11 is respectively connected to the beam assembly 10, and the adjacent beam assemblies 10 are fixedly connected; a transmission device 12 is installed in the middle position inside the B module frame 7, and a guide wheel assembly 14 is connected inside the C module frame 8, and the guide wheel assembly 14 is rollingly connected to the bottom of the beam assembly 10, and the transmission device 12 is fixedly connected to the bottom of the beam assembly 10 of the B module frame 7; the right bottom of the adjustable grate bed 1 is overlapped with the left top of the beam assembly 10 on the A module frame 6.

[0040] The road beam assembly 10 includes a push plate 21, a sunken labyrinth grate plate 22, an H-shaped sealing cover 23, an L-shaped seal 24 and an H-shaped steel 26. The sunken labyrinth grate plate 22 is arranged above the H-shaped steel 26 and is arranged longitudinally. The L-shaped seal 24 and the H-shaped sealing cover 23 are respectively arranged on both sides above the sunken labyrinth grate plate 22. The push plate 21 is arranged above the middle position between two adjacent sunken labyrinth grate plates 22. The push plate 21, the sunken labyrinth grate plate 22, the H-shaped sealing cover 23, the L-shaped seal 24 and the H-shaped steel 26 are fixedly connected by a bolt assembly 25.

[0041] The unloading assembly 9 includes a unloading frame 15, a movable shaft 16, a connecting rod 17 and a lifting hydraulic cylinder B18. The movable shaft 16 is fixedly connected to the unloading frame 15. The unloading frame 15 is movably connected to the adjustable grate bed 1 through the movable shaft 16. The top end of the connecting rod 17 is rotatably connected to the side of the bottom of the unloading frame 15 away from the movable shaft 16. The end of the connecting rod 17 away from the unloading frame 15 is rotatably connected to the top of the lifting hydraulic cylinder B18. The bottom of the lifting hydraulic cylinder B18 is fixedly connected to the middle position of the top of the support frame 4.

[0042] A sealing asbestos board 19 and a heat-resistant sealing board 20 are fixedly connected to the bottom of the adjustable grate bed 1, and the sealing asbestos board 19 is arranged on one side of the modular frame.

[0043] The sunken labyrinth grate plate 22 includes a positioning plate 27 and a ventilation plate assembly 29. The positioning plates 27 are distributed on both sides of the ventilation plate assembly 29. Both ends of the positioning plate 27 and the ventilation plate assembly 29 are respectively connected with a fixing plate 30. The top of the fixing plate 30 is fixedly connected with a side baffle 28. The positioning plate 27 is provided with a mounting hole 31 near the outer edge.

[0044] The ventilation plate assembly 29 includes an upper ventilation plate 32, a lower ventilation plate 33 and an air inlet 34. The upper ventilation plate 32 and the lower ventilation plate 33 are both made of equilateral angle steel. The upper ventilation plate 32 and the lower ventilation plate 33 are arranged in a positive and negative manner and are welded and fixed to the inner wall of the fixed plate 30; the air inlet 34 is connected to the air outlet channel 35 on both sides, and the air outlet channel 35 is connected to the air outlet 36 at one end away from the air inlet 34.

[0045] Working principle:

[0046] When using the invention, the equipment needs to be installed first. The supporting frame 4 and the adjustable grate bed 1 and other components can be installed first, and then the A module frame 6, the B module frame 7 and the C module frame 8 and the beam assembly 10 on them can be installed step by step. Such modular installation can effectively improve the equipment installation efficiency. The beam assembly 10 needs to be arranged in a horizontal distribution when installed, so that the H-shaped sealing cover 23 on one beam assembly 10 is nested on the L-shaped sealing member 24 of the adjacent beam assembly 10, thereby effectively avoiding the occurrence of leakage in the beam gap.

[0047] After the equipment is installed, according to the characteristics of lithium clinker, the lifting hydraulic cylinder A3 and the telescopic length of the hydraulic rod 5 are adjusted in advance to make the equipment have a certain inclination, so that the lithium clinker can be efficiently transported in the grate cooler. When the lithium clinker with smaller particle size flows out of the kiln, it will fall on the adjustable grate bed 1, and then the clinker will flow to the beam assembly 10 of the A module frame 6 by utilizing the fluidity of the clinker and the cooling wind in the equipment. At this time, the transmission device 12 will drive the beam assembly 10 on each module to reciprocate together on the tugboat assembly 11, and the guide wheel assembly 14 at the bottom of the beam assembly 10 can prevent the beam assembly 10 from deflecting, so as to gradually transport the clinker on the beam assembly 10 of the A module frame 6 through the beam assembly 10 on the B module frame 7 and the C module frame 8 to the tail of the equipment. During the transportation process, because the grate plate is a sinking labyrinth grate plate 22, the cooling air will flow out from the air outlet 36 through the air inlet 34 through the air outlet channel 35 to cool the clinker on the beam assembly 10. There are side baffles 28 on both sides of the grate plate, which can effectively prevent fine powder from leaking from both sides of the grate plate, and the sinking structure of the grate plate makes the contact surface between the grate plate and the clinker small, which can reduce the wear of the grate plate. The push plate 21 on the beam assembly 10 can be used to push the movement of the clinker on the beam, and on the other hand, a box space will be formed between the two adjacent push plates 21 and the H-shaped sealing cover 23 and L-shaped sealing member 24 on both sides of the beam. A part of the clinker can be stored in this space without moving, which can effectively protect the sinking labyrinth grate plate 22 from being burned by the high-temperature clinker.

[0048] When a snowman is formed on the adjustable grate bed 1, the lifting hydraulic cylinder B18 can be used to drive the connecting rod 17 to flip the unloading rack 15 upward, thereby increasing the inclination angle of the unloading rack 15, so that large pieces of sintered clinker are crushed or ejected from the bottom and flow downward along the adjustable grate bed 1, thereby achieving the purpose of removing the snowman. Compared with the existing lithium ore smelting plant using snowman-pushing equipment to remove snowman accumulation, this method reduces the cost of factory construction. A heat-resistant sealing plate 20 is set at the bottom of the right side of the adjustable grate bed 1, which can play a certain sealing role when the road beam assembly 10 and the adjustable grate bed 1 move relative to each other, and its high temperature resistance will not be affected by the high temperature clinker, and the sealing asbestos plate 19 can be pressed against the road beam assembly 10, which can more effectively prevent fine powder from leaking from the end of the road beam assembly 10.

[0049] In addition, when the raw material properties of a lithium ore smelter change significantly over a long period of time, resulting in changes in the clinker particle size and affecting the fluidity of the clinker and the conveying performance of the grate cooler, the overall inclination of the grate cooler can be changed by adjusting the lifting hydraulic cylinder A3 and the telescopic length of the adjusting hydraulic rod 5 to adapt to the changes in the clinker fluidity caused by the raw material changes.

[0050] The above description is only a preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. An adjustable modular grate cooler for a lithium ore smelter, comprising an adjustable grate bed (1), a support frame (4) and a modular frame, characterized in that: A lifting hydraulic cylinder A (3) is fixedly installed at the edge of one side of the top of the support frame (4); a support seat (2) is fixedly connected to the top of the support frame (4) relative to the side of the lifting hydraulic cylinder A (3); the top of the lifting hydraulic cylinder A (3) is fixedly connected to the left side of the bottom of the adjustable grate bed (1); the top of the support seat (2) is rotatably connected to the side wall of the adjustable grate bed (1); a discharge assembly (9) is connected to the middle position of the top of the adjustable grate bed (1); the modular frame comprises an A module frame (6), a B module frame (7) and a C module frame (8); the A module frame (6), the B module frame (7) and the C module frame (8) are fixedly connected to one side of the support frame (4) in sequence; the height of the modular frame is lower than the adjustable grate bed (1); the bottom ends of the A module frame (6), the B module frame (7) and the C module frame (8) are all provided with an adjusting hydraulic rod (5); the top end of the telescopic rod of the adjusting hydraulic rod (5) is connected to the A module frame (6), The frame bodies of the B module frame (7) and the C module frame (8) are movably connected; the adjacent connecting side walls of the A module frame (6), the B module frame (7) and the C module frame (8) are fixedly connected with a wind chamber partition wall (13); the A module frame (6), the B module frame (7) and the C module frame (8) are all fixedly connected with a tugboat assembly (11) inside; the tops of the tugboat assemblies (11) are respectively connected with a track beam assembly (10); and the adjacent track beam assemblies (10) are fixedly connected; a transmission device (12) is installed at a middle position inside the B module frame (7); the C module frame (8) is connected with a guide wheel assembly (14) inside; the guide wheel assembly (14) is rollingly connected to the bottom of the track beam assembly (10); and the transmission device (12) is fixedly connected to the bottom of the track beam assembly (10) of the B module frame (7); the right bottom of the adjustable grate bed (1) overlaps the left top of the track beam assembly (10) on the A module frame (6); The road beam assembly (10) comprises a push plate (21), a sunken labyrinth grate plate (22), an H-shaped sealing cover (23), an L-shaped sealing member (24) and an H-shaped steel (26); the sunken labyrinth grate plate (22) is arranged above the H-shaped steel (26) and is arranged longitudinally; the L-shaped sealing member (24) and the H-shaped sealing cover (23) are respectively arranged on both sides above the sunken labyrinth grate plate (22); the push plate (21) is arranged above the middle position of two adjacent sunken labyrinth grate plates (22); and the push plate (21), the sunken labyrinth grate plate (22), the H-shaped sealing cover (23), the L-shaped sealing member (24) and the H-shaped steel (26) are fixedly connected by a bolt assembly (25).

2. The adjustable modular grate cooler for lithium ore smelting plant according to claim 1, characterized in that: The unloading assembly (9) comprises a unloading frame (15), a movable shaft (16), a connecting rod (17) and a lifting hydraulic cylinder B (18), wherein the movable shaft (16) is fixedly connected to the unloading frame (15), the unloading frame (15) is movably connected to the adjustable grate bed (1) via the movable shaft (16), the top end of the connecting rod (17) is rotatably connected to the side of the bottom of the unloading frame (15) away from the movable shaft (16), the end of the connecting rod (17) away from the unloading frame (15) is rotatably connected to the top of the lifting hydraulic cylinder B (18), and the bottom of the lifting hydraulic cylinder B (18) is fixedly connected to the middle position of the top of the support frame (4).

3. The adjustable modular grate cooler for lithium ore smelting plant according to claim 1, characterized in that: A sealing asbestos board (19) and a heat-resistant sealing board (20) are fixedly connected to the bottom of the adjustable grate bed (1); the heat-resistant sealing board (20) is arranged on a side close to the modular frame, and the sealing asbestos board (19) is arranged on a side of the heat-resistant sealing board (20) away from the modular frame.

4. The adjustable modular grate cooler for lithium ore smelting plant according to claim 1, characterized in that: The sunken labyrinth grate plate (22) comprises a positioning plate (27) and a ventilation plate assembly (29), wherein the positioning plates (27) are distributed on both sides of the ventilation plate assembly (29), and both ends of the positioning plate (27) and the ventilation plate assembly (29) are respectively connected to a fixing plate (30), and the top end of the fixing plate (30) is fixedly connected to a side baffle (28), and the positioning plate (27) is provided with a mounting hole (31) near the outer edge side.

5. The adjustable modular grate cooler for lithium ore smelting plant according to claim 4, characterized in that: The ventilation plate assembly (29) comprises an upper ventilation plate (32), a lower ventilation plate (33) and an air inlet (34); the upper ventilation plate (32) and the lower ventilation plate (33) are both made of equilateral angle steel; the upper ventilation plate (32) and the lower ventilation plate (33) are arranged in a positive and negative interlocking manner and are welded and fixed to the inner side wall of the fixed plate (30); the air inlet (34) is connected to an air outlet channel (35) on both sides; the air outlet channel (35) is connected to the air outlet (36) at one end away from the air inlet (34).

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