Feed processing equipment

Abstract

The utility model relates to feed processing equipment which comprises a mounting frame, a drying box is mounted at the upper end of the mounting frame through bolts, an air outlet pipe is arranged at the upper end of the drying box, a hot air blowing structure is mounted on the front side of the mounting frame, a preheating feeding structure is mounted on the front side of the drying box, and the preheating feeding structure extends to the middle in the drying box. A second feeding hopper is installed on the inner wall of the drying box, driving structures are installed on the left side and the right side of the drying box and extend into the drying box, the two driving structures are opposite in rotating direction and do not interfere with each other, a rolling structure is installed on the driving structure located on the right side of the drying box, and an overturning structure is installed on the driving structure located on the left side of the drying box. The overturning structure is connected to the driving structure on the right side and comprises a second supporting rod installed on the driving structure on the right side of the drying box, and an installation circular ring is installed at the outer end of the second supporting rod. The feed drying device solves the problem that an existing feed drying processing device is low in drying efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of feed processing, in particular to feed processing equipment. Background Art

[0002] During feed processing, the feed often contains more water during the initial processing. If no intervention is made during the later processing, a large amount of feed agglomeration will occur, which is not conducive to the subsequent feed processing and pellet forming. At this time, processing equipment for drying the feed is needed. Generally, the processing equipment for drying the feed is composed of a fan, a heater, and a stirrer. However, the existing drying processing equipment has low drying efficiency and is unable to break up the agglomerated feed.

[0003] In order to address such problems, Chinese patent CN220472022U, a feed processing air-drying device points out that an exhaust pipe is arranged on one side of the drying cylinder, and a collection box is fixed at one end of the exhaust pipe. A filter plate is arranged inside the collection box. The filter plate can filter and collect the feed residue discharged from the exhaust pipe when the drying cylinder is drying the feed. While protecting the use environment around the device, it also reduces the feed loss caused by air drying, which is of great help in environmental protection and resource conservation. The turning rod has multiple stirring blades fixed on its outside, so that the feed can be fully stirred in the drying cylinder, greatly improving the drying efficiency of the feed.

[0004] Although the above document can, to a certain extent, stir the feed and air-dry it simultaneously by stir-frying, and although it can improve the drying (air-drying) efficiency to a certain extent, there are still certain problems. First, the stir-frying chamber in the document is too closed and cannot effectively evaporate the moisture in the feed. Moreover, the feed in the chamber can only roll in the direction of rotation of the turning rod, and cannot roll synchronously clockwise and counterclockwise, resulting in low drying efficiency.

[0005] Therefore, in order to increase the drying efficiency of feed, a feed processing equipment is proposed. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a feed processing device, which solves the problem of low drying efficiency of the prior feed drying processing equipment.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a feed processing equipment, including a mounting frame, a drying box is installed on the upper end of the mounting frame by bolts, an air outlet pipe is provided on the upper end of the drying box, a hot blowing structure is installed on the front side of the mounting frame, a preheating feeding structure is installed on the front side of the drying box, the preheating feeding structure extends to the middle of the drying box, a second feeding funnel is installed on the inner wall of the drying box, driving structures are installed on the left and right sides of the drying box, and the driving structures extend into the drying box, the two sets of driving structures turn in opposite directions and do not interfere with each other, a tumbling structure is installed on the driving structure on the right side of the drying box, and a flipping structure is installed on the driving structure on the left side of the drying box, and the flipping structure is connected to the driving structure on the right side. Structurally, its flipping structure includes a second support rod installed on the driving structure on the right side of the drying box, and a mounting ring is installed on the outer end of the second support rod. A grid cylinder is installed on the inner wall of the mounting ring, and an annular mounting frame is installed on the surface of the grid cylinder, and openings are provided on the surface of the grid cylinder and the surface of the annular mounting frame. Its tumbling structure includes a sleeve installed on the driving structure on the left side of the drying box, and its driving structure located on the right side of the drying box includes a ball bearing, one end of the sleeve is connected to the outer ring of the ball bearing, and a connecting rod is symmetrically installed on the surface of the sleeve, and a flap is connected to the outer end of the connecting rod, and its hot blowing structure extends into the drying box toward the surface of the grid cylinder, and its second feed funnel discharge port extends downward and tilts into the grid cylinder.

[0008] Through the above technical solution, further, openings are equidistantly provided on the surface of the flap.

[0009] As a preferred technical solution, a fixed plate is installed on the inner wall of the drying box, a movable wheel is installed on the upper end of the fixed plate, and the movable wheel is in contact with the surface of the annular mounting frame.

[0010] Furthermore, the flap is arranged in an arc shape, and the end of the flap is in contact with the inner surface of the grid cylinder.

[0011] As a preferred technical solution, the driving structure located on the right side of the drying box includes a second mounting plate installed on the right side of the drying box, a second servo motor is installed on the right end face of the second mounting plate, the output end of the second servo motor is connected to a coupling, one end of the coupling is connected to a second rotating shaft, the second rotating shaft extends into the drying box, and a ball bearing is installed on the surface of the second rotating shaft located in the drying box, a second bearing seat is installed on the inner wall of the right side of the drying box, and the second rotating shaft is connected to the inner ring of the second bearing seat.

[0012] Furthermore, the driving structure located on the left side of the drying box includes a second mounting plate installed on the left side of the drying box, a second servo motor is installed on the left end face of the second mounting plate, the output end of the second servo motor is connected to a coupling, one end of the coupling is connected to a third rotating shaft, and the third rotating shaft extends into the drying box, a shaft sleeve is installed on the surface of the third rotating shaft located in the drying box, a third bearing seat is installed on the left inner wall of the drying box, and the third rotating shaft is connected to the inner ring of the third bearing seat.

[0013] As a preferred technical solution, the preheating feeding structure includes a feeding barrel, wherein a first bracket and a second bracket are respectively installed on the left side of the feeding barrel, a first servo motor is installed on the upper end face of the first bracket, a first bearing seat is installed on the upper end face of the second bracket, a first rotating shaft is provided on the inner ring of the first bearing seat and extends into the feeding barrel, a second pulley is installed on the surface of the first rotating shaft, a first pulley is installed on the output end of the first servo motor, a transmission belt is sleeved on the surface of the second pulley and the first pulley, a spiral feed plate is installed on the surface of the first rotating shaft located in the feeding barrel, and the outer surface of the feeding barrel is wrapped with an outer sleeve, a first support rod is installed on both the left and right sides of the first bracket, the lower end of the first support rod is connected to the upper end face of the mounting frame, a feeding opening is provided on the upper surface of the feeding barrel, and a first feeding funnel is connected at the opening.

[0014] Furthermore, the hot air blowing structure includes a first mounting plate installed on the front side of the mounting frame, a centrifugal fan is installed on the front end surface of the first mounting plate, the air outlet end of the centrifugal fan is connected to a first connecting pipe, the upper end of the first connecting pipe is connected to an air heater, and the upper end of the air heater is connected to a pipe connection structure.

[0015] As a preferred technical solution, the pipe connection structure includes a second connecting pipe with double openings installed at the upper end of the air heater. The second connecting pipe is connected to the outer sleeve through a third connecting pipe. Another through hole is connected to a connecting pipe. The surface of the connecting pipe is connected to two groups of fourth connecting pipes and extends into the drying box. An air outlet pipe is provided on the surface of the fourth connecting pipe, and the air outlet pipe faces the surface of the grid cylinder.

[0016] Compared with the prior art, the present invention provides a feed processing equipment with the following beneficial effects:

[0017] 1. This equipment preliminarily heats the feed through the preheating feeding structure to evaporate its moisture, and then the feed enters the mesh cylinder to tumble, and reversely tumbles through the flap to stir the feed to the greatest extent, and uses the hot blowing structure to blow hot air on the surface of the mesh cylinder. The hot air passes through the mesh and enters the mesh cylinder. Due to the action of the flap, the feed is splashed in the mesh cylinder, making the feed fluffy, further increasing the contact area between the hot air and the feed, further drying the feed, and effectively evaporating the moisture of the feed, thereby solving the problem of low drying efficiency of existing feed drying processing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a feed processing equipment of the utility model;

[0019] Figure 2 This is a schematic diagram of the extension position of the preheating feeding structure of a feed processing equipment in the drying box structure of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the second support rod of a feed processing equipment according to the present utility model;

[0021] Figure 4 This is a schematic diagram of a flap structure of feed processing equipment according to the present utility model;

[0022] Figure 5 This is a schematic diagram of the driving structure of a feed processing equipment of the utility model;

[0023] Figure 6 This is a structural schematic diagram of the second mounting plate of a feed processing equipment according to the present utility model;

[0024] Figure 7 This is a schematic diagram of the preheating feeding structure of a feed processing equipment of the utility model;

[0025] Figure 8 This is a left-side schematic diagram of a preheating feeding structure of a feed processing equipment according to the present invention;

[0026] Figure 9 This utility model is a feed processing equipment Figure 8 AA cross-sectional view of ;

[0027] Figure 10 This is a schematic diagram of the structure of a movable wheel of feed processing equipment of the present utility model.

[0028] In the figure: 1. Mounting frame; 2. Drying box; 3. Exhaust pipe; 4. First mounting plate; 5. Centrifugal fan; 6. First connecting pipe; 7. Air heater; 8. Second connecting pipe; 9. Third connecting pipe; 10. First support rod; 11. Preheating feeding structure; 12. First feeding funnel; 13. First bracket; 14. Second bracket; 15. First servo motor; 16. First pulley; 17. First bearing seat; 18. First rotating shaft; 19. Second pulley; 20. Screw feed plate; 21. External Sleeve; 22. Second mounting plate; 23. Second servo motor; 24. Coupling; 25. Second bearing seat; 26. Second rotating shaft; 27. Ball bearing; 28. Third bearing seat; 29. Third rotating shaft; 30. Connecting pipe; 31. Fourth connecting pipe; 32. Bushing; 33. Connecting rod; 34. Flap; 35. Second feed hopper; 36. Second support rod; 37. Mounting ring; 38. Annular mounting frame; 39. Grid cylinder; 40. Fixed plate; 41. Movable wheel; 42. Feed cylinder. DETAILED DESCRIPTION

[0029] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0030] See also Figure 1-10The utility model provides the following technical solutions: a feed processing equipment, including a mounting frame 1, a drying box 2 is installed on the upper end of the mounting frame 1 by bolts, an air outlet pipe 3 is provided on the upper end of the drying box 2, a hot blowing structure is installed on the front side of the mounting frame 1, a preheating feeding structure 11 is installed on the front side of the drying box 2, the preheating feeding structure 11 extends to the middle of the drying box 2, a second feeding funnel 35 is installed on the inner wall of the drying box 2, a driving structure is installed on the left and right sides of the drying box 2, and the driving structure extends into the drying box 2, and the two sets of driving structures turn in opposite directions and do not interfere with each other, a tumbling structure is installed on the driving structure on the right side of the drying box 2, and a flipping structure is installed on the driving structure on the left side of the drying box 2, and the flipping structure is connected to the driving structure on the right side, and the flipping structure includes a structure installed on the drying box The second support rod 36 on the driving structure on the right side of the box 2, the second support rod 36 is equipped with a mounting ring 37 at the outer end, and a grid cylinder 39 is installed on the inner wall of the mounting ring 37, and an annular mounting frame 38 is installed on the surface of the grid cylinder 39, and openings are provided on the surface of the grid cylinder 39 and the surface of the annular mounting frame 38. Its tumbling structure includes a sleeve 32 installed on the driving structure on the left side of the drying box 2, and its driving structure on the right side of the drying box 2 includes a ball bearing 27, one end of the sleeve 32 is connected to the outer ring of the ball bearing 27, and a connecting rod 33 is symmetrically installed on the surface of the sleeve 32, and the outer end of the connecting rod 33 is connected to a flap 34, and its hot blowing structure extends into the drying box 2 toward the surface of the grid cylinder 39, and its second feed funnel 35 discharge port extends downward and tilts into the grid cylinder 39.

[0031] In this embodiment, the specific working principle is as follows: the feed of this equipment enters the second feed funnel 35 through the preheating feeding structure 11. It should be noted that the discharge port of the second feed funnel 35 extends downward and tilted to the grid cylinder 39, so the feed enters the grid cylinder 39, and the driving structure located on both sides of the drying box 2 realizes the rotation of the grid cylinder 39 and the rotation of the shaft sleeve 32. The rotation of the shaft sleeve 32 drives the flap 34 to rotate, wherein the flap 34 rotates in the grid cylinder 39 in the opposite direction to the grid cylinder 39, so that the feed appears to splash in the grid cylinder 39, thereby achieving the fluffing treatment of the feed, and secondly, the hot air is continuously blown toward the surface of the grid cylinder 39 through the hot blowing structure to dry the feed in the grid cylinder 39, thereby achieving the purpose of accelerating the drying of the feed, thereby solving the problem of low drying efficiency of the existing feed drying processing equipment. The dried feed falls through the opening on the surface of the grid cylinder 39 and can then be collected.

[0032] According to the above, in order to further improve the drying efficiency and prevent the feed from agglomerating, please refer to Figure 4It can be seen that the surface of the flap 34 is provided with openings at equal intervals. This arrangement allows the surface of the flap 34 to have a tooth-like structure, so that when it is turned over, the feed can be separated and the feed can be more easily driven.

[0033] In order to prevent the openings on the surface of the grid cylinder 39 from being blocked and to ensure the smooth rotation of the grid cylinder 39, please refer to Figure 3 and Figure 10 It can be seen that a fixed plate 40 is installed on the inner wall of the drying box 2, and a movable wheel 41 is installed on the upper end of the fixed plate 40, and the movable wheel 41 is in contact with the surface of the annular mounting frame 38. When the movable wheel 41 contacts the surface opening of the annular mounting frame 38, vibration will occur due to collision, so that the feed located at the opening of the annular mounting frame 38 can be vibrated down, thereby preventing the problem of feed blockage.

[0034] In order to enable the flap 34 to better lift the feed, please refer to Figure 4 It can be seen that the flap 34 is arranged in an arc shape, and the end of the flap 34 contacts the inner surface of the grid cylinder 39.

[0035] According to the above, there are two groups of starting structures, of which the driving structure on the right side of the drying box 2 can be found in detail. Figure 6 and combined Figure 5 It can be seen that the driving structure located on the right side of the drying box 2 includes a second mounting plate 22 installed on the right side of the drying box 2, and a second servo motor 23 is installed on the right end face of the second mounting plate 22. The output end of the second servo motor 23 is connected to a coupling 24, and one end of the coupling 24 is connected to a second rotating shaft 26. The second rotating shaft 26 extends into the drying box 2, and a ball bearing 27 is installed on the surface of the second rotating shaft 26 located in the drying box 2. A second bearing seat 25 is installed on the inner wall of the right side of the drying box 2, and the second rotating shaft 26 is connected to the inner ring of the second bearing seat 25.

[0036] The driving structure on the left side of the drying box 2 can be found in Figure 6 and combined Figure 5 It can be seen that the driving structure located on the left side of the drying box 2 includes a second mounting plate 22 installed on the left side of the drying box 2, and a second servo motor 23 is installed on the left end face of the second mounting plate 22. The output end of the second servo motor 23 is connected to a coupling 24, and one end of the coupling 24 is connected to a third rotating shaft 29, and the third rotating shaft 29 extends into the drying box 2. A shaft sleeve 32 is installed on the surface of the third rotating shaft 29 located in the drying box 2, and a third bearing seat 28 is installed on the left inner wall of the drying box 2, and the third rotating shaft 29 is connected to the inner ring of the third bearing seat 28.

[0037] See Figure 1 、 Figure 2 、 Figure 7-9It can be seen that the preheating feeding structure 11 includes a feeding barrel 42, and the first bracket 13 and the second bracket 14 are respectively installed on the left side of the feeding barrel 42, the first bracket 13 is installed on the upper end surface of the first servo motor 15, and the second bracket 14 is installed on the upper end surface of the second bracket 14. The inner ring of the first bearing seat 17 is provided with a first rotating shaft 18 and extends into the feeding barrel 42, and the surface of the first rotating shaft 18 is provided with a second pulley 19, and the output end of the first servo motor 15 is provided with a first pulley 16, and the second pulley 19 and the first pulley 16 are provided with a transmission belt. The surface of the first rotating shaft 18 in the feeding barrel 42 is provided with a spiral feed plate 20, and the outer surface of the feeding barrel 42 is wrapped with an outer sleeve 21. A first support rod 10 is installed on both the left and right sides of a bracket 13. The lower end of the first support rod 10 is connected to the upper end surface of the mounting frame 1. A feed opening is provided on the upper surface of the feed barrel 42, and a first feed funnel 12 is connected to the opening. The first servo motor 15 drives the first rotating shaft 18 to rotate through a belt drive, and then drives the spiral feed plate 20 to rotate, so that the feed in the first feed funnel 12 is discharged through the rotation of the spiral feed plate 20, and a cavity is formed between the outer sleeve 21 and the feed barrel 42, which facilitates preheating by a hot blowing structure, so that the temperature of the surface of the feed barrel 42 is increased, and the moisture of the feed in the feed barrel 42 is evaporated in the early stage, thereby facilitating subsequent drying.

[0038] According to the above, the hot blowing structure can be specifically referred to Figure 7-Figure 9 It can be seen that the hot air blowing structure includes a first mounting plate 4 installed on the front side of the mounting frame 1, a centrifugal fan 5 is installed on the front end face of the first mounting plate 4, the air outlet end of the centrifugal fan 5 is connected to a first connecting pipe 6, the upper end of the first connecting pipe 6 is connected to an air heater 7, and the upper end of the air heater 7 is connected to a pipe connection structure.

[0039] In conjunction with the above, please refer to Figure 1 It can be seen that the pipe connection structure includes a second connecting pipe 8 with double openings installed at the upper end of the air heater 7. The second connecting pipe 8 is connected to the outer sleeve 21 through the third connecting pipe 9. The other through hole is connected to a connecting pipe 30. The surface of the connecting pipe 30 is connected to two groups of fourth connecting pipes 31 and extends into the drying box 2. The surface of the fourth connecting pipe 31 is provided with an air outlet pipe, and the air outlet pipe faces the surface of the grid cylinder 39.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A feed processing device, comprising a mounting frame (1), a drying box (2) being mounted on the upper end of the mounting frame (1) by bolts, an air outlet pipe (3) being provided on the upper end of the drying box (2), a hot air blowing structure being mounted on the front side of the mounting frame (1), a preheating feeding structure (11) being mounted on the front side of the drying box (2), the preheating feeding structure (11) extending to the middle of the drying box (2), a second feeding funnel (35) being mounted on the inner wall of the drying box (2), and characterized in that: The drying box (2) is provided with a driving structure on both the left and right sides, and the driving structure extends into the drying box (2). The two sets of driving structures rotate in opposite directions and do not interfere with each other. A tumbling structure is provided on the driving structure on the right side of the drying box (2). A flipping structure is provided on the driving structure on the left side of the drying box (2), and the flipping structure is connected to the driving structure on the right side. The flipping structure includes a second support rod (36) provided on the driving structure on the right side of the drying box (2). A mounting ring (37) is provided on the outer end of the second support rod (36). A grid cylinder (39) is provided on the inner wall of the mounting ring (37). An annular mounting frame ( 38), and the surface of the grid cylinder (39) and the surface of the annular mounting frame (38) are both provided with openings, the tumbling structure includes a sleeve (32) mounted on the drive structure on the left side of the drying box (2), the drive structure located on the right side of the drying box (2) includes a ball bearing (27), one end of the sleeve (32) is connected to the outer ring of the ball bearing (27), and a connecting rod (33) is symmetrically mounted on the surface of the sleeve (32), the outer end of the connecting rod (33) is connected to a flap (34), the hot blowing structure extends into the drying box (2) toward the surface of the grid cylinder (39), and the discharge port of the second feeding funnel (35) extends downward and tilts into the grid cylinder (39).

2. A feed processing equipment according to claim 1, characterized in that: The surface of the flap (34) is provided with openings at equal intervals.

3. A feed processing equipment according to claim 1, characterized in that: A fixed plate (40) is installed on the inner wall of the drying box (2), a movable wheel (41) is installed on the upper end of the fixed plate (40), and the movable wheel (41) is in surface contact with the annular mounting frame (38).

4. A feed processing equipment according to claim 1, characterized in that: The flap (34) is arranged in an arc shape, and the end of the flap (34) contacts the inner surface of the grid cylinder (39).

5. A feed processing equipment according to claim 1, characterized in that: The driving structure located on the right side of the drying box (2) includes a second mounting plate (22) mounted on the right side of the drying box (2), a second servo motor (23) is mounted on the right end face of the second mounting plate (22), an output end of the second servo motor (23) is connected to a coupling (24), one end of the coupling (24) is connected to a second rotating shaft (26), the second rotating shaft (26) extends into the drying box (2), and a ball bearing (27) is mounted on the surface of the second rotating shaft (26) located in the drying box (2), a second bearing seat (25) is mounted on the inner wall of the right side of the drying box (2), and the second rotating shaft (26) is connected to the inner ring of the second bearing seat (25).

6. A feed processing equipment according to claim 1, characterized in that: The driving structure located on the left side of the drying box (2) includes a second mounting plate (22) mounted on the left side of the drying box (2), a second servo motor (23) is mounted on the left end face of the second mounting plate (22), an output end of the second servo motor (23) is connected to a coupling (24), one end of the coupling (24) is connected to a third rotating shaft (29), and the third rotating shaft (29) extends into the drying box (2), a shaft sleeve (32) is mounted on the surface of the third rotating shaft (29) located in the drying box (2), a third bearing seat (28) is mounted on the inner wall of the left side of the drying box (2), and the third rotating shaft (29) is connected to the inner ring of the third bearing seat (28).

7. The feed processing equipment according to claim 1, characterized in that: The preheating feeding structure (11) includes a feeding barrel (42), and a first bracket (13) and a second bracket (14) are respectively installed on the left side of the feeding barrel (42), a first servo motor (15) is installed on the upper end surface of the first bracket (13), and a first bearing seat (17) is installed on the upper end surface of the second bracket (14), the inner ring of the first bearing seat (17) is provided with a first rotating shaft (18) and extends into the feeding barrel (42), the surface of the first rotating shaft (18) is installed with a second pulley (19), and the output end of the first servo motor (15) is installed. A first pulley (16) is provided, a transmission belt is provided on the surface of the second pulley (19) and the first pulley (16), a spiral feed plate (20) is provided on the surface of the first rotating shaft (18) located in the feed barrel (42), and the outer surface of the feed barrel (42) is wrapped with an outer sleeve (21), and the left and right sides of the first bracket (13) are both provided with first support rods (10), the lower end of the first support rod (10) is connected to the upper end surface of the mounting frame (1), and the upper surface of the feed barrel (42) is provided with a feed opening, and the opening is connected to a first feed funnel (12).

8. The feed processing equipment according to claim 1, characterized in that: The hot air blowing structure comprises a first mounting plate (4) mounted on the front side of the mounting frame (1), a centrifugal fan (5) being mounted on the front end surface of the first mounting plate (4), an air outlet end of the centrifugal fan (5) being connected to a first connecting pipe (6), an upper end of the first connecting pipe (6) being connected to an air heater (7), and an upper end of the air heater (7) being connected to a pipe connection structure.

9. A feed processing equipment according to claim 8, characterized in that: The pipe connection structure comprises a second connecting pipe (8) with double openings installed at the upper end of the air heater (7), the second connecting pipe (8) being connected to the outer sleeve (21) via a third connecting pipe (9), the other through hole being connected to a connecting pipe (30), the surface of the connecting pipe (30) being connected to two groups of fourth connecting pipes (31) extending into the drying box (2), and an air outlet pipe being provided on the surface of the fourth connecting pipe (31), the air outlet pipe being directed toward the surface of the grid cylinder (39).

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