Intelligent production equipment for saline-alkali soil biological conditioner
By designing an intelligent production equipment including a granulator combined with a grinding plate and a rotating disk, the problems of uneven particle size and poor powder uniformity in the existing equipment are solved, and more efficient production and production of biological conditioners are achieved. Better performance.
Patent Information
- Application Number
- CN202411645556.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2025-01-21
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing intelligent production equipment for bioconditioning agents for saline-alkali land. When producing bioconditioning agents, the rotation stability and vibration of the disc granulator lead to uneven particle sizes, and the uniformity of the powder inside the stirring barrel is poor, which reduces bioconditioning. effect and performance of agent.
A intelligent production equipment including a mixing barrel, a supporting frame, a disk granulator, a water tank and a cylinder, and a granulator combined with a rubbing plate and a rotating disc Elastic squeezing coordination to ensure that the pulleys are closely conflicted, and the rubbing plate is stable and rubbed into particles. At the same time, through the design of the jet mechanism and the diversion tube, the moist and mixing uniformity of the powder is improved.
Through the design of the device, the stable rotation and evenly rubbing into particles of the powder in the disk granulator are ensured, which improves the overall effect and performance of biometricizers.
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Figure CN119327345A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of saline-alkali land biological conditioning, and more specifically, to an intelligent production device for a saline-alkali land biological conditioning agent. Background Art
[0002] Saline-alkali land is a type of salt accumulation, which means that the salt contained in the soil affects the normal growth of crops. According to incomplete statistics from UNESCO and FAO, the area of saline-alkali land in the world is 954.38 million hectares, of which 99.13 million hectares are in my country. Plants can hardly survive in areas with severe saline-alkali soil. Intelligent production equipment is needed to produce biological conditioners, which can improve the properties of saline-alkali soil and increase the survival rate of plants. However, the existing intelligent production equipment for biological conditioners has the following shortcomings when producing biological conditioners: the biological conditioners are prepared by mixing and stirring a variety of powders inside a mixing barrel and then discharged into a disc granulator of the production equipment to be rolled into granules. When the disc granulator rolls the various powders into granules, the rotation stability of the disc granulator and the vibration generated will cause the formed particles to be uneven in size, thereby reducing the overall effect of the biological conditioner in improving the properties of saline-alkali soil after production, and the poor uniformity of stirring the various powders inside the mixing barrel will also reduce the performance of the biological conditioner after production. Summary of the invention
[0003] The technical solution adopted by the present invention to achieve the technical purpose is: an intelligent production equipment for saline-alkali land biological conditioner, which structure includes a mixing barrel, a support frame, a disc granulator, a water tank, and a cylinder. The mixing barrel is installed at the upper left end of the support frame, and a water tank is installed at the upper right end of the support frame. The water tank is connected to the inside of the disc granulator, and the cylinder is fixed at the bottom of the support frame above the disc granulator. It is characterized in that: The disc granulator is provided with a grinding plate and a rotating disc, and the side of the grinding plate is provided with a spring sleeve, an extrusion rod, a hinged plate and a pulley, the extrusion rod is elastically extruded inside the spring sleeve, and the outside of the extrusion rod is connected to a hinged plate, which is connected to the pulley shaft through the hinged plate, and the pulley is against the inside of the disc granulator to assist in sliding, and the motor at the lower end of the rotating disc drives the rotating disc to rotate inside the disc granulator, and the spring sleeve, the extrusion rod, the hinged plate and the pulley are each provided with two, which are respectively arranged at the front and rear sides of the grinding plate to form a "V"-shaped structure; The lower end of the grinding and rubbing board is also provided with a lower protrusion and an upper groove. A plurality of lower protrusions and a plurality of upper grooves are arranged in parallel and spaced apart at the bottom of the grinding and rubbing board. The lower protrusions and the upper grooves are both in a semicircular structure.
[0004] As a further improvement of the present invention, the disc granulator is also provided with an upper edge cover, a resistance cover, a lower discharge pipe and a water inlet pipe. The upper edge cover blocks the powder at the top of the disc granulator, the left side of the disc granulator is limited by the resistance cover and the lower end of the lower discharge pipe, the upper end of the lower discharge pipe is through-connected with the discharge port at the lower end of the mixing barrel to discharge the powder into the disc granulator, the top of the support rod at the left end of the grinding plate is connected with the lower end of the cylinder, the grinding plate is driven to rise and fall by the cylinder, and the water inlet pipe is through-connected with the water tank at the upper end.
[0005] As a further improvement of the present invention, the lower end of the water inlet pipe is also connected to a diversion pipe, and the nozzle at the lower end of the diversion pipe sprays the liquid from top to bottom toward the powder inside the disc granulator. There are two diversion pipes and they are located outside the lower row pipe. Three nozzles are provided at the lower end of each diversion pipe.
[0006] As a further improvement of the present invention, an auxiliary ball is further provided at the inner edge of the disc granulator to assist the rotating disc to stably rotate inside the disc granulator. A buffer mechanism is further provided inside the lower end of the disc granulator, and the top of the buffer mechanism supports the bottom of the rotating disc. The buffer mechanism includes a lower receiving plate, a ball, a supporting connecting rod, a sliding block and a spring support rod. The ball is embedded in the upper end of the lower receiving plate and assists in sliding at the bottom of the rotating plate. The middle end of the bottom of the lower receiving plate is hinged to the top of the supporting connecting rod, the lower end of the supporting connecting rod is hinged to the sliding block, and the sliding block slides elastically along the spring support rod. Two of the supporting connecting rod, sliding block and spring support rod are each provided, and form an inverted "V" shape structure.
[0007] As a further improvement of the present invention, a motor is provided at the middle end of the top of the mixing barrel, and the output end of the motor drives the agitator inside the mixing barrel to rotate and stir. A filling port is also provided at the upper right end of the mixing barrel to discharge powder into the mixing barrel. The lower end of the agitator is connected to the inner end of the support rod, and a scraper is provided at the outer end of the support rod. The scraper scrapes the powder on the inner wall of the lower end of the mixing barrel. The lower end of the mixing barrel is a lower guide inclined structure with a wide upper end and a narrow lower end, and the scraper is a folded plate structure, which conflicts with the vertical end face of the lower end of the mixing barrel and the lower guide inclined end face.
[0008] As a further improvement of the present invention, an injection mechanism is also provided at the upper end of the mixing barrel, and the injection mechanism is composed of a compressor, an air outlet pipe, a sleeve ring, a conducting pipe and an injection nozzle. The compressor is fixedly installed at the upper left end of the mixing barrel to provide air pressure for the air outlet pipe. Two air outlet pipes are provided, and a sleeve ring is provided at the connection between the two air outlet pipes. The connection between the agitator and the motor output end passes through the inside of the sleeve ring. The two air outlet pipes are connected by a conducting pipe for air conduction. The injection nozzle is arranged at the bottom of the air outlet pipe to spray the air pressure from top to bottom. Two conducting pipes are provided, and they are in an arc-shaped structure. The two conducting pipes and the sleeve ring are on the same axis.
[0009] The beneficial effects of the present invention are: 1. The spring sleeve, the extrusion rod and the hinged plate are elastically extruded and matched, so that the pulley can be tightly pressed against the inner wall of the disc granulator. The pulley guides and assists the sliding, ensuring that the grinding plate can stably rub the powder into particles when the rotating disc drives the powder to rotate inside the disc granulator. At the same time, when the lower receiving disc drives the ball bearing to assist in sliding at the bottom of the rotating disc, the sliding block slides slightly elastically along the spring support rod. At this time, the supporting connecting rod is elastically linked, so that the lower receiving disc and the ball bearing can absorb the vibration generated by the rotation of the rotating disc to ensure that the rotating disc stably drives the powder to rotate and rub it into particles; 2. The agitator is driven by the starting motor to mix the powder inside the mixing barrel. At the same time, the compressor at the upper end generates air pressure and discharges it into the air outlet pipe. With the auxiliary sliding of the sleeve ring, it avoids collision with the rotation of the agitator. The two conducting pipes are connected to make the air pressure flow evenly inside the two air outlet pipes, ensuring that the injection nozzles at the bottom of the two air outlet pipes can spray the air pressure evenly to the powder, thereby improving the uniformity of mixing multiple powders inside the mixing barrel. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The present invention is a schematic structural diagram of an intelligent production device for a saline-alkali land biological conditioner.
[0011] Figure 2 It is a schematic diagram of the top structure of the disc granulator of the present invention.
[0012] Figure 3 It is a schematic diagram of the structure of the scrubbing board of the present invention in a top view and a front view.
[0013] Figure 4 It is a schematic diagram of the internal and partially enlarged structure of the disc granulator of the present invention.
[0014] Figure 5 It is a structural schematic diagram of the buffer mechanism of the present invention.
[0015] Figure 6 It is a schematic diagram of the internal structure of the stirring barrel of the present invention.
[0016] Figure 7 It is a bottom view structural schematic diagram of the injection mechanism of the present invention.
[0017] In the figure: mixing barrel 1, support frame 2, disc granulator 3, water tank 4, cylinder 5, upper cover 31, resistance cover 32, lower discharge pipe 33, grinding plate 34, water inlet pipe 35, diverter pipe 351, nozzle 352, rotating disk 36, support rod 341, spring sleeve 342, extrusion rod 343, hinge plate 344, pulley 345, lower protrusion 346, upper groove 347, auxiliary ball 36 1. Motor 362, buffer mechanism 363, lower receiving plate 3631, ball bearing 3632, supporting connecting rod 3633, sliding block 3634, spring support rod 3635, motor 11, filling port 12, agitator 13, supporting rod 14, scraper 15, injection mechanism 16, discharge port 17, compressor 161, air outlet pipe 162, sleeve ring 163, conducting pipe 164, injection nozzle 165. DETAILED DESCRIPTION
[0018] The present invention is further described below in conjunction with the accompanying drawings: Example
[0019] As attached Figure 1 To Attachment Figure 5 As shown: The present invention discloses an intelligent production device for a saline-alkali land biological conditioner, which comprises a mixing barrel 1, a support frame 2, a disc granulator 3, a water tank 4, and a cylinder 5. The mixing barrel 1 is installed at the upper left end of the support frame 2, and the water tank 4 is installed at the upper right end of the support frame 2. The water tank 4 is connected to the inside of the disc granulator 3 through the cylinder 5. The bottom of the support frame 2 above the disc granulator 3 is fixed, and the characteristics are as follows: The disc granulator 3 is provided with a grinding plate 34 and a rotating disc 36. The side of the grinding plate 34 is provided with a spring sleeve 342, an extrusion rod 343, a hinge plate 344 and a pulley 345. The extrusion rod 343 is elastically extruded inside the spring sleeve 342, and the outer side of the extrusion rod 343 is connected to a hinge plate 344, which is connected to the axis of the pulley 345 through the hinge plate 344. The pulley 345 resists and assists in sliding inside the disc granulator 3. The motor 362 at the lower end of the rotating disc 36 drives the rotating disc 36 to rotate inside the disc granulator 3; the lower end of the grinding plate 34 is also provided with a lower protrusion 346 and an upper groove 347, and a plurality of lower protrusions 346 and a plurality of upper grooves 347 are distributed in parallel and spaced apart at the bottom of the grinding plate 34. The disc granulator 3 is also provided with an upper cover 31, an abutment cover 32, a lower discharge pipe 33 and a water inlet pipe 35. The upper cover 31 is on the disc granulator 3 The top of the granulator 3 blocks the powder, the left side of the disc granulator 3 is limited by the lower end of the lower discharge pipe 33 through the resistance cover 32, the upper end of the lower discharge pipe 33 is connected with the discharge port 17 at the lower end of the mixing barrel 1 to discharge the powder into the disc granulator 3, the top of the support rod 341 at the left end of the grinding plate 34 is connected with the lower end of the cylinder 5, and the grinding plate 34 is driven to rise and fall by the cylinder 5, the water inlet pipe 35 is connected with the water tank 4 at the upper end, and the lower end of the water inlet pipe 35 is also connected with a shunt pipe 351, and the nozzle 352 at the lower end of the shunt pipe 351 sprays the liquid from top to bottom to the powder inside the disc granulator 3, the inner edge of the disc granulator 3 is also provided with an auxiliary ball 361, and the auxiliary rotating disk 36 rotates stably inside the disc granulator 3, and the lower end of the disc granulator 3 is also provided with a buffer mechanism 363, and the top of the buffer mechanism 363 supports the bottom of the rotating disk 36;The buffer mechanism 363 includes a lower receiving plate 3631, a ball 3632, a supporting connecting rod 3633, a sliding block 3634 and a spring support rod 3635. The ball 3632 is embedded in the upper end of the lower receiving plate 3631, and the ball 3632 assists in sliding at the bottom of the rotating plate 36. The middle end of the bottom of the lower receiving plate 3631 is hinged to the top of the supporting connecting rod 3633, and the lower end of the supporting connecting rod 3633 is hinged to the sliding block 3634, and the sliding block 3634 elastically slides along the spring support rod 3635. In the present invention, the powder mixed in the mixing barrel 1 is discharged into the disc granulator 3 through the lower discharge pipe 33 and stays on the upper surface of the rotating disk 36. At this time, the rotating disk 36 is driven to rotate by starting the motor 362, and the powder on the rotating disk 36 rotates accordingly. At this time, the water tank 4 above discharges water into the diverter pipe 351 through the water inlet pipe 35, and finally from the nozzle 352 The powder is ejected from the inside of the disc granulator 3, and the grinding plate 34 remains stationary at the right end inside the disc granulator 3. The spring sleeve 342, the extrusion rod 343 and the hinge plate 344 are elastically extruded and matched, so that the pulley 345 can be tightly pressed against the inner wall of the disc granulator 3. The guide and auxiliary sliding of the pulley 345 ensure that the grinding plate 34 can stably rub the powder into particles when the rotating disc 36 drives the powder to rotate inside the disc granulator 3. At the same time, when the lower receiving disc 3631 drives the ball 3632 to slide at the bottom of the rotating disc 36, the sliding block 3634 slides slightly elastically along the spring support rod 3635. At this time, the supporting connecting rod 3633 is elastically linked, so that the lower receiving disc 3631 and the ball 3632 can absorb the vibration generated when the rotating disc 36 rotates, ensuring that the rotating disc 36 stably drives the powder to rotate and rub it into particles.
[0020] A preferred technical solution, the spring sleeve 342, the extrusion rod 343, the hinged plate 344 and the pulley 345 are each provided with two, which are respectively arranged on the front and rear sides of the grinding plate 34 to form a "V"-shaped structure, and the spring sleeve 342, the extrusion rod 343 and the hinged plate 344 are elastically extruded and matched, so that the pulley 345 can be tightly pressed against the inner wall of the disc granulator 3, and the guide of the pulley 345 assists in sliding, ensuring that the grinding plate 34 can stably rub the powder into granules when the rotating disk 36 below drives the powder to rotate inside the disc granulator 3; A preferred technical solution, the lower protrusion 346 and the upper groove 347 are both semicircular structures, and multiple lower protrusions 346 and multiple upper grooves 347 are arranged side by side and spaced apart at the lower end of the grinding plate 34, so that the grinding plate 34 can grind the powder into particles of relatively uniform size; A preferred technical solution is that two diverter pipes 351 are provided and are located outside the lower discharge pipe 33. Three nozzles 352 are provided at the lower end of each diverter pipe 351 to improve the uniform spraying of liquid to the powder inside the disc granulator 3, so that the powder is wetted more evenly, and the effect of grinding the powder into particles is improved; A preferred technical solution is that there are two supporting links 3633, two sliding blocks 3634 and two spring rods 3635, and they form an inverted "V" shape structure. When the lower receiving plate 3631 drives the ball 3632 to assist in sliding at the bottom of the rotating plate 36, the sliding block 3634 slides slightly elastically along the spring rod 3635. At this time, the supporting link 3633 is elastically linked, so that the lower receiving plate 3631 and the ball 3632 can absorb and reduce the vibration generated by the rotation of the rotating plate 36, thereby ensuring that the rotating plate 36 stably drives the powder to rotate and rub it into granules.
[0021] Embodiment 2: Based on embodiment 1, as shown in the attached Figure 6 To Attachment Figure 7 As shown: The middle end of the top of the mixing barrel 1 is provided with a motor 11, and the output end of the motor 11 drives the stirrer 13 inside the mixing barrel 1 to rotate and stir. The upper right end of the mixing barrel 1 is also provided with a filling port 12 to discharge powder into the mixing barrel 1. The lower end of the stirrer 13 is connected to the inner end of the support rod 14, and the outer end of the support rod 14 is provided with a scraper 15. The scraper 15 scrapes the powder on the inner wall of the lower end of the mixing barrel 1. The upper end of the mixing barrel 1 is also provided with an injection mechanism 16, and the injection mechanism 16 is pressurized. The compressor 161, an air outlet pipe 162, a sleeve ring 163, a guide pipe 164 and an injection nozzle 165 are composed of a compressor 161, an air outlet pipe 162, a sleeve ring 163, a guide pipe 164 and an injection nozzle 165. The compressor 161 is fixedly installed at the upper left end of the mixing barrel 1 to provide air pressure for the air outlet pipe 162. Two air outlet pipes 162 are provided, and a sleeve ring 163 is provided at the connection of the two air outlet pipes 162. The connection between the agitator 13 and the output end of the motor 11 passes through the sleeve ring 163. The two air outlet pipes 162 are connected by the guide pipe 164. The injection nozzle 165 is arranged at the bottom of the air outlet pipe 162 to spray air pressure from top to bottom. In the present invention, when various powders are put into the mixing barrel 1 from the filling port 12 for stirring and mixing, the agitator 13 is driven by the starting motor 11 to stir and mix the powders in the mixing barrel 1. At the same time, the compressor 161 at the upper end works to generate air pressure, which is discharged into the air outlet pipe 162. With the auxiliary sliding of the sleeve ring 163, collision with the rotation of the agitator 13 is avoided. In addition, through the penetration of the two conducting pipes 164, the air pressure in the two air outlet pipes 162 flows evenly, ensuring that the injection nozzle 165 at the bottom of the two air outlet pipes 162 can spray the air pressure evenly to the powder, thereby improving the uniformity of mixing the various powders in the mixing barrel 1. After mixing evenly, the scraper sheet 15 performs wall scraping at the lower end of the mixing barrel 1, ensuring that after the powders in the mixing barrel 1 are stirred and mixed evenly, they can be fully discharged from the mixing barrel 1 to the discharge port 17, thereby avoiding powder residue in the mixing barrel 1.
[0022] A preferred technical solution, the lower end of the mixing barrel 1 is a lower guide inclined structure with a wide upper end and a narrow lower end, and the scraper 15 is a folded plate structure, which conflicts with the vertical end face of the lower end of the mixing barrel 1 and the lower guide inclined end face. The agitator 13 stirs and mixes various powders inside the mixing barrel 1 while driving the scraper 15 to scrape the wall at the lower end of the mixing barrel 1, ensuring that the powder inside the mixing barrel 1 can be fully discharged from the inside of the mixing barrel 1 to the discharge port 17 after being stirred and mixed evenly, so as to avoid the powder remaining inside the mixing barrel 1; A preferred technical solution is that two conducting tubes 164 are provided and have an arc-shaped structure. The two conducting tubes 164 and the sleeve ring 163 are located on the same axis. Through the penetration of the two conducting tubes 164, the uniformity of the air pressure flow inside the two air outlet pipes 162 is improved, thereby ensuring that the injection nozzles 165 at the bottom of the two air outlet pipes 162 can spray the air pressure evenly to the powder, thereby improving the uniformity of mixing various powders inside the mixing barrel 1.
[0023] Utilizing the technical solution of the present invention, or those skilled in the art designing similar technical solutions inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.
Claims
1. An intelligent production device for a saline-alkali land biological conditioner, comprising a stirring barrel (1), a support frame (2), a disc granulator (3), a water tank (4), and a cylinder (5), wherein the stirring barrel (1) is mounted on the upper left end of the support frame (2), and a water tank (4) is mounted on the upper right end of the support frame (2), the water tank (4) is connected to the inside of the disc granulator (3), and the cylinder (5) is fixed to the bottom of the support frame (2) above the disc granulator (3), characterized in that: The disc granulator (3) is provided with a grinding plate (34) and a rotating disc (36); a spring sleeve (342), an extrusion rod (343), a hinged plate (344) and a pulley (345) are provided on the side of the grinding plate (34); the extrusion rod (343) is elastically extruded inside the spring sleeve (342); the outer side of the extrusion rod (343) is connected to the hinged plate (344); the pulley (345) is connected to the axis of the pulley (345) through the hinged plate (344); the pulley (345) abuts against the inside of the disc granulator (3) to assist sliding; the motor (362) at the lower end of the rotating disc (36) drives the rotating disc (36) to rotate inside the disc granulator (3); The lower end of the grinding and rubbing plate (34) is also provided with a lower protrusion (346) and an upper groove (347), and a plurality of lower protrusions (346) and a plurality of upper grooves (347) are arranged in parallel and spaced apart at the bottom of the grinding and rubbing plate (34).
2. The intelligent production equipment for saline-alkali land biological conditioner according to claim 1 is characterized by: The disc granulator (3) is further provided with an upper cover (31), a resistance cover (32), a lower discharge pipe (33) and a water inlet pipe (35). The upper cover (31) blocks the powder at the top of the disc granulator (3). The left side of the disc granulator (3) is restrained by the resistance cover (32) and the lower end of the lower discharge pipe (33). The upper end of the lower discharge pipe (33) is connected to the discharge port (17) at the lower end of the mixing barrel (1) to discharge the powder into the disc granulator (3). The top of the support rod (341) at the left end of the grinding plate (34) is connected to the lower end of the cylinder (5), and the grinding plate (34) is driven to rise and fall by the cylinder (5). The water inlet pipe (35) is connected to the water tank (4) at the upper end.
3. The intelligent production equipment for saline-alkali land biological conditioner according to claim 2 is characterized in that: The lower end of the water inlet pipe (35) is also connected to a diversion pipe (351), and a nozzle (352) at the lower end of the diversion pipe (351) sprays the liquid from top to bottom toward the powder inside the disc granulator (3).
4. The intelligent production equipment for saline-alkali land biological conditioner according to claim 3 is characterized by: An auxiliary ball (361) is also provided on the inner edge of the disc granulator (3) to assist the rotating disc (36) to stably rotate inside the disc granulator (3). A buffer mechanism (363) is also provided inside the lower end of the disc granulator (3), and the top of the buffer mechanism (363) supports the bottom of the rotating disc (36); The buffer mechanism (363) comprises a lower connecting plate (3631), a ball bearing (3632), a supporting connecting rod (3633), a sliding block (3634) and a spring supporting rod (3635); the ball bearing (3632) is embedded in the upper end of the lower connecting plate (3631), and the ball bearing (3632) assists in sliding at the bottom of the rotating plate (36); the middle end of the bottom of the lower connecting plate (3631) is hinged to the top of the supporting connecting rod (3633); the lower end of the supporting connecting rod (3633) is hinged to the sliding block (3634), and the sliding block (3634) elastically slides along the spring supporting rod (3635).
5. The intelligent production equipment for saline-alkali land biological conditioner according to claim 1 is characterized by: A motor (11) is provided at the middle of the top of the mixing barrel (1), and the output end of the motor (11) drives the stirrer (13) inside the mixing barrel (1) to rotate and stir. A filling port (12) is also provided at the upper right end of the mixing barrel (1) to discharge powder into the mixing barrel (1). The lower end of the stirrer (13) is connected to the inner end of a support rod (14), and a scraper (15) is provided at the outer end of the support rod (14). The scraper (15) scrapes the powder on the inner wall of the lower end of the mixing barrel (1).
6. The intelligent production equipment for saline-alkali land biological conditioner according to claim 5 is characterized by: The upper end of the mixing barrel (1) is also provided with an injection mechanism (16), which is composed of a compressor (161), an air outlet pipe (162), a sleeve ring (163), a conducting pipe (164) and an injection nozzle (165). The compressor (161) is fixedly mounted at the upper left end of the mixing barrel (1) to provide air pressure for the air outlet pipe (162). Two air outlet pipes (162) are provided, and a sleeve ring (163) is provided at the connection between the two air outlet pipes (162). The connection between the output end of the stirrer (13) and the motor (11) passes through the inside of the sleeve ring (163). The two air outlet pipes (162) are connected to each other through the conducting pipe (164). The injection nozzle (165) is provided at the bottom of the air outlet pipe (162) to spray the air pressure from top to bottom.