Pulse type grain drying fluidized bed

Abstract

The utility model relates to the technical field of grain drying equipment, in particular to a pulse type grain drying fluidized bed which comprises a drying chamber, an air inlet injection pipeline is connected to the bottom of the drying chamber, a feeding bin and an exhaust pipeline are connected to the upper portion of the drying chamber, and the interior of the air inlet injection pipeline is divided into a plurality of air inlet channels through a plurality of partition plates. The air inlet directions of the air inlet channels are inclined, and air door mechanisms capable of controlling the air inlet channels to be opened and closed intermittently are arranged in the air inlet channels. Segmented air intake is adopted at the bottom of the drying chamber, and intermittent pulse type air intake is adopted in each section of air intake channel, so that impact force for forward movement is generated on grains while hot air intake dries the grains, the grains gradually move towards the direction of the discharging bin, grain accumulation is avoided, meanwhile, it is guaranteed that the grains make full contact with hot air, and the grain drying efficiency is improved. The drying efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of grain drying equipment, and specifically relates to a pulse type grain drying fluidized bed. BACKGROUND

[0002] The existing fluidized bed grain drying system, such as the fluidized bed grain drying device recorded in authorization announcement number CN204787602U, blows hot air into the drying chamber from the bottom of the fluidized bed by means of a blower, so that the rice is dried inside.

[0003] The traditional fluidized bed rice drying structure has three main shortcomings, first, the blower sends in hot air at a fixed angle, and the rice can only jump up and down, and is not easy to move forward, which can easily cause the rice to accumulate; second, the speed of feeding into the drying chamber is uneven, and under the condition that the temperature of the hot air is constant, if the feeding is too fast, it can easily lead to excessive grain flow, and the drying effect is poor, and if the feeding is too slow, it can easily affect the overall drying efficiency and waste the heat of the hot air, therefore, uneven feeding speed can easily lead to uneven quality of the dried grain; third, the traditional fluidized bed rice drying structure cannot fully utilize the heat of the hot air, and the drying efficiency is low. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a pulse type grain drying fluidized bed.

[0005] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0006] A pulse type grain drying fluidized bed, comprising a drying chamber, an air inlet injection pipeline is connected to the bottom of the drying chamber, a feeding bin and an exhaust pipeline are respectively connected to the upper part of the drying chamber, the inside of the air inlet injection pipeline is divided into multiple air inlet channels by multiple partitions, the air inlet direction of the air inlet channel is obliquely arranged, and a damper mechanism capable of controlling the intermittent opening and closing of the air inlet channel is arranged in the air inlet channel.

[0007] The feeding bin is usually arranged at one end of the drying chamber, and the grain enters from the upper end of the drying chamber, in the above structure, the air inlet injection pipeline is divided into multiple air inlet channels, so that the hot air enters from the bottom of the drying chamber through multiple channels, and the air inlet channel is independently controlled to open and close, so that the air inlet can be controlled in a segmented manner, in addition, the air inlet channel is intermittently opened and closed, so that intermittent pulse upward air inlet is formed, and intermittent impact on the grain in the drying chamber is generated, in cooperation with the obliquely arranged air inlet channel, so that the hot air inlet can produce a forward moving impact force on the grain while drying the grain, the grain gradually moves towards the discharge bin, the accumulation of the grain is avoided, and the grain is ensured to fully contact with the hot air, and the drying efficiency is improved.

[0008] The air door mechanism comprises a door plate capable of closing the air inlet channel, a shaft rod fixedly connected to the door plate, and the shaft rod is rotatably connected to the side wall of the air injection pipeline at both ends, and the shaft rod is connected to the first driving mechanism at one end after penetrating through the side wall of the air injection pipeline, the first driving mechanism can intermittently drive the shaft rod to rotate in one direction, and when rotating, the door plate closes the air inlet channel, and the shaft rod is also connected to a reset mechanism, the reset mechanism can drive the shaft rod to rotate in the other direction to reset, and after resetting, the door plate opens the air inlet channel.

[0009] Specifically, the first driving mechanism comprises a dial piece fixedly connected to one end of the shaft rod penetrating through the side wall of the air injection pipeline, the air injection pipeline is rotatably provided with at least one first transmission sprocket, the first transmission sprocket is connected to a first chain, and a plurality of uniformly distributed protruding structures are fixedly arranged on the first chain, the protruding structures can drive the dial piece to rotate in one direction by a certain angle, when the protruding structures no longer dial the dial piece, the dial piece is reset by the reset mechanism, the first chain is connected to a first driving motor through a first driving motor.

[0010] The protruding structure is a cylindrical protrusion or a sheet-shaped protruding structure, and the reset mechanism is a reset torsional spring arranged between the shaft rod and the side wall of the air injection pipeline.

[0011] In order to ensure the transmission stability of the first chain and the stability of the dial piece reset, a plurality of first limiting mechanisms and second limiting mechanisms are arranged outside the air injection pipeline, and the first limiting mechanism and the second limiting mechanism are arranged correspondingly with the dial piece.

[0012] The first limiting mechanism comprises two bent plates fixedly connected outside the air injection pipeline, the two bent plates are oppositely arranged and have a gap therebetween, the first chain can be slidably connected between the two bent plates, and the two bent plates can ensure the stability of the first chain when moving.

[0013] The second limiting mechanism comprises a support plate, a limiting column is detachably mounted on the support plate, the limiting column is arranged close to the lower end of the dial piece, the limiting column can limit the amplitude of the dial piece reset, avoid the rebound force of the reset torsional spring being too large, cause the dial piece to rotate too much, and limit the rotation angle of the dial piece, so that the door plate reaches the set opening amplitude; the support plate is provided with a scale line, the scale line can provide a scale for the installation position of the limiting column and the rotation angle of the dial piece, facilitate the staff to observe and set the angle of the dial piece from the outside, so as to set the opening amplitude of the door plate to the air inlet channel. Preferably, a plurality of connecting holes are formed in the support plate, and the limiting column is inserted into the connecting hole.

[0014] The top of the feeding bin is an inlet, the bottom is an outlet, a feeding mechanism is arranged in the feeding bin, the feeding mechanism comprises a feeding plate and two feeding rollers, a plurality of feeding sub-division plates are uniformly distributed around the center of the outer surface of the feeding roller, the feeding roller is connected to the second driving mechanism, the second driving mechanism drives the two feeding rollers to rotate, the upper part of the two feeding rollers is provided with a feeding plate, the feeding plate is in inverted V-shaped structure, the inlet of the feeding bin is located directly above the feeding plate, the feeding plate is located at the upper part of the gap between the two feeding rollers and can block part of the structure of the two feeding rollers in the vertical direction. A guide channel is formed between the feeding plate and the side wall of the feeding bin to guide the grains to the upper part of the feeding roller, so that the grains fall between the feeding sub-division plates of the feeding roller, and when the feeding roller rotates, the grains can be carried to the lower part and fall through the outlet. In the above structure, the design of the feeding roller can realize quantitative and uniform feeding, and the feeding speed and the feeding amount can be controlled by controlling the rotation speed and rotation time of the feeding roller.

[0015] The second driving mechanism comprises a second transmission sprocket, the center shafts of the two feeding rollers are respectively rotatably connected with the side walls of the feeding bin, and one end of the center shaft penetrates through the side wall of the feeding bin and is fixedly connected with the second transmission sprocket. The second transmission sprocket is connected with a second chain, the second chain is connected with a second driving sprocket, the second driving sprocket is connected with a second driving motor, and the second driving motor is fixedly connected to one side of the feeding bin.

[0016] The discharge end of the air injection pipeline is connected with a discharge bin, the top and the bottom of the discharge bin are both open, the top opening of the discharge bin is communicated with the drying chamber for receiving the grains after drying treatment, a shielding plate is arranged on the upper part of the discharge bin and can close the upper opening of the discharge bin, the shielding plate is connected with a rotating shaft, the two ends of the rotating shaft are respectively rotatably connected with the discharge bin, and one end of the rotating shaft is connected with a third driving motor.

[0017] In the above structure, the shielding plate can close the upper opening of the discharge bin to avoid the grains falling directly into the discharge bin, thereby prolonging the contact time of the grains with the hot air in the drying chamber, fully utilizing the heat of the hot air, and improving the drying efficiency and drying effect of the grains.

[0018] A mesh plate is arranged on the upper part of the air injection pipeline to prevent the grains from falling into the air injection pipeline; a plurality of branch pipelines are connected with a plurality of air blowing devices respectively through the lower part of the air injection pipeline, the air blowing devices are connected with a control valve, and temperature detection sensors are arranged in the branch pipelines and the exhaust pipeline to detect the inlet air temperature and the outlet air temperature, thereby facilitating the monitoring of the internal drying condition.

[0019] The feed bin is provided with a material level detection mechanism at the top, the material level detection mechanism comprises a fixed rod, the fixed rod is fixedly connected with the top wall of the feed bin, the lower part of the fixed rod is fixedly connected with a fixed plate, a detection switch is arranged on the fixed plate, the fixed plate is rotationally connected with a baffle, the detection switch is arranged on the side of the fixed plate close to the baffle, and a rebound structure is arranged between the baffle and the fixed plate.

[0020] In the above structure, the fixed rod is fixedly connected with the top wall of the feed bin and is used for detecting whether the grain reaches the height where the material level detection mechanism is located; when the grain reaches the height where the material level detection mechanism is located, the grain gradually accumulates and presses the baffle, the baffle rotates relative to the fixed plate and approaches the fixed plate until triggering the detection switch; the detection switch detects the baffle, that is, the material level reaches the height where the mechanism is located; at this time, the detection switch sends a feedback signal to stop feeding.

[0021] A plurality of observation windows are arranged on the drying chamber and the feed bin, and a searchlight is arranged on the drying chamber, so that the working personnel can observe the internal working condition.

[0022] The utility model discloses the reached beneficial effect is:

[0023] The utility model discloses a drying structure of fluidized bed form, can carry out continuous, high temperature, fast drying to grain, makes grain even after drying, and in the process of drying, can handle the impurity (empty shell), reduces 10% -20% volume, directly reduces the storage area, and the drying temperature of the utility model discloses a drying temperature is higher, can realize high temperature insecticidal, in addition, the utility model discloses the floor area is less.

[0024] The utility model discloses drying chamber bottom is sectional type air intake, and each section air passage is intermittent pulse type air intake, thereby make hot -blast air intake when drying grain, produce the impact force of moving forward to grain, make grain gradually move to the direction of discharge bin, avoid grain accumulation, guarantee grain and hot -blast full contact simultaneously, improve drying efficiency.

[0025] The utility model discloses feed bin can realize quantitative even feeding, thereby convenient control grain speed and flow that enter drying chamber, convenient control drying progress and efficiency.

[0026] The utility model discloses the baffle plate is arranged at the discharge bin, avoids a large amount of grain to fall into the discharge bin directly, to flow out directly from the discharge bin, the setting of baffle plate can prolong the contact time of grain and hot -blast in drying chamber, make full use of the heat of hot -blast, improve the efficiency of drying treatment. DRAWINGS

[0027] The drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with the embodiments of the utility model and do not constitute the limitation to the utility model. In the drawings:

[0028] Figure 1 is a structural schematic view of the utility model;

[0029] Figure 2 is a structural schematic view (explosion view) of the utility model;

[0030] Figure 3 is a structural schematic view of the air inlet injection pipeline;

[0031] Figure 4 is the explosion view of Figure 3 ;

[0032] Figure 5 is a structural schematic view (part structure amplification) of the air inlet injection pipeline;

[0033] Figure 6 is a structural schematic view (first structure form) of the first drive mechanism;

[0034] Figure 7 is a structural schematic view (second structure form) of the first drive mechanism;

[0035] Figure 8 is a structural schematic view of the feeding bin;

[0036] Figure 9 is the explosion view of Figure 8 ;

[0037] Figure 10 is a structural schematic view of the feeding roller shaft;

[0038] Figure 11 is a part structural schematic view of the feeding bin;

[0039] Figure 12 is a structural schematic view of the material level detection mechanism.

[0040] In the drawing: 1, feeding bin; 11, second driving sprocket; 12, second transmission sprocket; 13, second drive motor; 14, feeding plate; 15, feeding roller shaft; 151, feeding partition plate; 16, material level detection mechanism; 161, fixed rod; 162, fixed plate; 163, baffle; 2, drying chamber; 3, exhaust pipeline; 4, air inlet injection pipeline; 41, mesh plate; 42, first drive mechanism; 421, shifting piece; 422, bent plate; 423, support plate; 424, limiting column; 425, scale line; 426, first chain; 427, convex structure; 428, connecting hole; 429, connecting groove; 43, door plate; 44, shaft rod; 45, partition plate; 46, first drive motor; 47, first driving sprocket; 5, support; 6, branch pipeline; 7, second protection plate; 8, first protection plate; 9, discharging bin; 91, shielding plate; 92, third drive motor. Detailed Implementation

[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0042] Example:

[0043] like Figures 1-5 As shown, a pulse-type grain drying fluidized bed includes a drying chamber 2. The bottom of the drying chamber 2 is connected to an air inlet injection pipe 4. The upper part of the drying chamber 2 is connected to a feed hopper 1 and an exhaust pipe 3. The air inlet injection pipe 4 is divided into multiple air inlet channels by multiple partitions 45. The air inlet channels are inclined. Each air inlet channel is equipped with a damper mechanism that can control the intermittent opening and closing of the air inlet channel.

[0044] Similar to existing structures, the feeding hopper 1 is located at one end of the drying chamber 2, and the grain enters from the upper end of the drying chamber 2. In the above structure, the air intake injection pipe 4 is divided into multiple air intake channels, so that hot air enters from the bottom of the drying chamber 2 through multiple channels respectively, and the air intake channels are independently controlled to open and close, thereby enabling segmented control of the air intake. In addition, the air intake channels open and close intermittently, thereby forming an intermittent pulse-like upward air intake, which generates an intermittent impact on the grain in the drying chamber 2. Combined with the inclined air intake channels, the hot air intake generates a forward-moving impact force on the grain while drying it, causing the grain to gradually move towards the discharge hopper 9, avoiding grain accumulation, and ensuring that the grain is in full contact with the hot air, thereby improving drying efficiency.

[0045] The damper mechanism includes a door panel 43, which can close the air intake channel. The door panel 43 is fixedly connected to a shaft 44. Both ends of the shaft 44 are rotatably connected to the side wall of the air intake injection pipe 4. One end of the shaft 44 passes through the side wall of the air intake injection pipe 4 and is connected to a first drive mechanism 42. The first drive mechanism 42 can intermittently drive the shaft 44 to rotate in one direction. When rotating, the door panel 43 closes the air intake channel. The shaft 44 is also connected to a return mechanism, which can drive the shaft 44 to rotate back in another direction. After returning to its original position, the door panel 43 opens the air intake channel.

[0046] like Figures 4-7As shown, in particular, the first driving mechanism 42 includes a dial 421 fixedly connected to one end of a shaft 44 penetrating a sidewall of the air injection pipeline 4, the air injection pipeline 4 is rotationally provided with a first transmission sprocket, the first transmission sprocket is connected with a first chain 426, the first chain 426 is fixedly provided with a plurality of uniformly distributed protruding structures 427, the protruding structures 427 can drive the dial 421 to rotate by a certain angle in one direction, when the protruding structures 427 no longer drive the dial 421, the dial 421 is reset by a reset mechanism, the first chain 426 is connected with a first driving sprocket 47, the first driving sprocket 47 is connected with a first driving motor 46.

[0047] The protruding structures 427 are cylindrical protrusions or sheet-shaped protruding structures 427; the reset mechanism is a reset torsional spring (not shown in the drawing), which is arranged between the shaft 44 and the sidewall of the air injection pipeline 4, when the protruding structures 427 drive the dial 421, the reset torsional spring is compressed and deformed, when the protruding structures 427 no longer drive the dial 421, the rebound force of the reset torsional spring drives the shaft 44 to reset.

[0048] In order to ensure the transmission stability of the first chain 426 and the stability of the dial 421 reset, the air injection pipeline 4 is externally provided with a plurality of first limiting mechanisms and second limiting mechanisms, the first limiting mechanisms and the second limiting mechanisms are correspondingly arranged with the dial 421.

[0049] The first limiting mechanism includes two bent plates 422 fixedly connected to the outside of the air injection pipeline 4, the two bent plates 422 are oppositely arranged and have a gap therebetween, the first chain 426 can be slidably connected between the two bent plates 422, and the two bent plates 422 can ensure the stability of the first chain 426 when moving.

[0050] The second limiting mechanism includes a support plate 423, the support plate 423 is detachably provided with a limiting column 424, the limiting column 424 is arranged close to the lower end of the dial 421, the limiting column 424 can limit the reset amplitude of the dial 421, avoid the rebound force of the reset torsional spring being too large to cause the dial 421 to rotate too much, and limit the rotation angle of the dial 421, so that the door plate 43 reaches the set opening amplitude; the support plate 423 is provided with a scale line 425, the position of the scale line 425 can provide a calibration for the installation position of the limiting column 424 and the rotation amplitude of the dial 421, so as to facilitate the staff to observe and set the angle of the dial 421 from the outside, thereby setting the opening amplitude of the door plate 43 to the air inlet passage.

[0051] The installation of the limiting column 424 can use various structures, the first structure is as follows: Figure 6As shown, a plurality of connecting holes 428 are formed on the support plate 423, and the limiting column 424 is tightly inserted into the connecting hole 428. Figure 7 As shown, an arc-shaped connecting groove 429 is formed on the support plate 423, and the limiting column 424 is slidingly installed in the connecting groove 429, and the position of the limiting column 424 can be fixed by a bolt.

[0052] As shown, Figure 2 As shown, the first protection plate 8 is arranged outside the first driving mechanism 42 to protect the first driving mechanism 42.

[0053] As shown, Figures 8-10 As shown, the top of the feeding bin 1 is an inlet, and the bottom is an outlet. The feeding bin 1 is provided with a feeding mechanism, which comprises a feeding plate 14 and two feeding roller shafts 15. The outer surface of the feeding roller shaft 15 is fixedly provided with a plurality of feeding sub-division plates 151 which are uniformly distributed around the center. The feeding roller shaft 15 is connected to the second driving mechanism, and the second driving mechanism drives the two feeding roller shafts 15 to rotate. The upper part of the two feeding roller shafts 15 is provided with the feeding plate 14, which is in the shape of an inverted V. The inlet of the feeding bin 1 is located directly above the feeding plate 14. The feeding plate 14 is located at the upper part of the gap between the two feeding roller shafts 15 and can block part of the structure of the two feeding roller shafts 15 in the vertical direction. A flow guide channel is formed between the feeding plate 14 and the side wall of the feeding bin 1 to guide the grains to the upper part of the feeding roller shaft 15, so that the grains fall between the feeding sub-division plates 151 of the feeding roller shaft 15. When the feeding roller shaft 15 rotates, it can drive the grains to the lower part and then fall through the outlet. In the above structure, the design of the feeding roller shaft 15 can realize quantitative and uniform feeding. The rotation speed and rotation time of the feeding roller shaft 15 can be controlled to control the feeding speed and the feeding amount.

[0054] The second driving mechanism comprises a second transmission sprocket 12. The central shafts of the two feeding roller shafts 15 are respectively rotationally connected to the side wall of the feeding bin 1, and one end of the central shaft penetrates through the side wall of the feeding bin 1 and is fixedly connected to the second transmission sprocket 12. The second transmission sprocket 12 is connected to a second chain, the second chain is connected to a second driving sprocket 11, the second driving sprocket 11 is connected to a second driving motor 13, and the second driving motor 13 is fixedly connected to one side of the feeding bin 1.

[0055] As shown, Figure 2 As shown, the second protection plate 7 is arranged outside the second transmission sprocket 12 and the second driving sprocket 11 to protect them.

[0056] As shown, Figures 3-5As shown, the discharge end of the air intake injection pipe 4 is connected to a discharge hopper 9. The top and bottom of the discharge hopper 9 are open. The top opening of the discharge hopper 9 is connected to the drying chamber 2 for receiving the dried grain. A baffle plate 91 is provided on the upper part of the discharge hopper 9. The baffle plate 91 can close the upper opening of the discharge hopper 9. The baffle plate 91 is connected to a rotating shaft. The two ends of the rotating shaft are rotatably connected to the discharge hopper 9, and one end of the rotating shaft is connected to a third drive motor 92. The third drive motor 92 drives the rotating shaft to rotate, thereby driving the baffle plate 91 to rotate, realizing the opening and closing of the upper opening of the discharge hopper 9.

[0057] In the above structure, the baffle plate 91 can close the upper opening of the discharge hopper 9, preventing the grain from falling directly into the discharge hopper 9, thereby extending the contact time between the grain and the hot air in the drying chamber 2, making full use of the heat of the hot air, and improving the grain drying efficiency and drying effect.

[0058] The bottom opening of the discharge hopper 9 discharges the material, and a conveyor or elevator can be installed at the bottom of the discharge hopper 9 to transport the dried grain.

[0059] A perforated plate 41 is provided on the upper part of the air intake injection pipe 4 to prevent grains from falling into the air intake injection pipe 4.

[0060] The lower part of the air intake injection pipe 4 is connected to multiple blowers via multiple branch pipes 6. The blowers are connected to control valves and hot air pipes, and the hot air comes from the finned heat exchanger.

[0061] Temperature sensors are installed in both the branch pipe 6 and the exhaust pipe 3 to detect the inlet and outlet air temperatures, facilitating monitoring of the internal dryness.

[0062] like Figure 11 , Figure 12 As shown, a material level detection mechanism 16 can also be connected to the top of the feeding hopper 1. The material level detection mechanism 16 includes a fixed rod 161, which is fixedly connected to the top wall of the feeding hopper 1. A fixed plate 162 is fixedly connected to the lower part of the fixed rod 161. A detection switch is provided on the fixed plate 162. A baffle 163 is rotatably connected to the fixed plate 162. The detection switch is located on the side of the fixed plate 162 near the baffle 163. A spring structure is provided between the baffle 163 and the fixed plate 162. The spring structure can be a spring structure.

[0063] In the structure, the fixed rod 161 is fixedly connected to the top wall of the feed bin 1, and is used to detect whether the grain reaches the height where the material level detection mechanism 16 is located. Under normal circumstances, the spring structure supports the baffle 163, so that the baffle 163 is arranged to be inclined relative to the fixed plate 162. When the grain reaches the height where the material level detection mechanism 16 is located, the grain gradually accumulates to press the baffle 163, the baffle 163 rotates relative to the fixed plate 162 and approaches the fixed plate 162, until the detection switch is triggered. The detection switch detects the baffle 163, and the material level reaches the height where the mechanism is located. At this time, the detection switch sends a feedback signal to stop feeding.

[0064] A plurality of observation windows are arranged on the drying chamber 2 and the feed bin 1, and a searchlight is arranged on the drying chamber 2, so that the working personnel can observe the internal working conditions.

[0065] As shown in Figure 1 , Figure 2 The air inlet injection pipeline 4 and the drying chamber 2 are supported by the support 5.

Claims

1. A pulse-type grain drying fluidized bed, characterized in that, The utility model provides a kind of drying room, which comprises a drying chamber (2), an air inlet injection pipe (4) connected to the bottom of the drying chamber (2), an inlet bin (1) and an exhaust pipe (3) connected to the upper part of the drying chamber (2) respectively, the air inlet injection pipe (4) is divided into multiple air inlet channels by multiple partitions (45), the air inlet direction of the air inlet channel is inclined, and the air inlet channel is provided with a damper mechanism capable of controlling the intermittent opening and closing of the air inlet channel.

2. The pulsed grain drying fluidized bed according to claim 1, characterized in that The damper mechanism comprises a door plate (43) fixedly connected with a shaft rod (44), the shaft rod (44) is rotatably connected to the side wall of the air inlet injection pipe (4) at both ends, one end of the shaft rod (44) penetrates the side wall of the air inlet injection pipe (4) and is connected with a first driving mechanism (42), the first driving mechanism (42) can intermittently drive the shaft rod (44) to rotate in one direction, and the shaft rod (44) is further connected with a return mechanism capable of driving the shaft rod (44) to rotate in the other direction.

3. A pulse-combustion fluidized bed for drying grains according to claim 2, characterized in that, The first driving mechanism (42) comprises a tab (421) fixedly connected with one end of the shaft rod (44) penetrating the side wall of the air inlet injection pipe (4), the air inlet injection pipe (4) is rotatably provided with at least one first transmission sprocket, the first transmission sprocket is connected with a first chain (426), the first chain (426) is fixedly provided with multiple uniformly distributed protruding structures (427), the protruding structures (427) can drive the tab (421) to rotate in one direction, the first chain (426) is connected with a first driving motor (46) through a first driving sprocket (47).

4. A pulse-combustion fluidized bed for drying grains according to claim 3, characterized in that, The protruding structures (427) are cylindrical protrusions or sheet-like protruding structures (427); the return mechanism is a return torsional spring arranged between the shaft rod (44) and the side wall of the air inlet injection pipe (4).

5. The pulsed grain drying fluidized bed of claim 3, wherein, The air inlet injection pipe (4) is provided with multiple sets of first limiting mechanisms and second limiting mechanisms outside, the first limiting mechanisms and the second limiting mechanisms are correspondingly arranged with the tab (421), the first limiting mechanism comprises two bent plates (422) fixedly connected outside the air inlet injection pipe (4), the two bent plates (422) are oppositely arranged and have a gap therebetween, the first chain (426) can be slidably connected between the two bent plates (422), the second limiting mechanism comprises a support plate (423) on which a limiting column (424) is detachably installed, the limiting column (424) is arranged close to the lower end of one side of the tab (421), and the support plate (423) is provided with a scale line (425).

6. A fluid bed according to claim 1 or 2, c h a r a c t e r i s e d in that The top of the feeding bin (1) is the inlet, the bottom is the outlet, the feeding bin (1) is provided with a feeding mechanism, the feeding mechanism comprises a feeding plate (14) and two feeding rollers (15), the outer surface of the feeding roller (15) is fixedly provided with a plurality of feeding partition plates (151) uniformly distributed around the center, the feeding roller (15) is connected with the second driving mechanism, the upper part of the two feeding rollers (15) is provided with the feeding plate (14), the feeding plate (14) is inverted V-shaped structure, the inlet of the feeding bin (1) is located directly above the feeding plate (14), the feeding plate (14) is located at the upper part of the gap between the two feeding rollers (15), and can block part of the structure of the two feeding rollers (15) in the vertical direction.

7. A pulse-combustion fluidized bed for drying grain according to claim 6, characterized in that The second driving mechanism comprises a second transmission sprocket (12), the center shafts of the two feeding rollers (15) are respectively rotatably connected with the side wall of the feeding bin (1), and one end of the center shaft penetrates out of the side wall of the feeding bin (1) and is fixedly connected with the second transmission sprocket (12), the second transmission sprocket (12) is connected with a second chain, the second chain is connected with a second driving sprocket (11), and the second driving sprocket (11) is connected with a second driving motor (13).

8. The pulsed grain drying fluidized bed of claim 1, wherein, The discharge end of the air injection pipeline (4) is connected with a discharge bin (9), the top and bottom of the discharge bin (9) are open, the top opening of the discharge bin (9) is communicated with the drying chamber (2), the upper part of the discharge bin (9) is provided with a shielding plate (91), the shielding plate (91) can close the upper opening of the discharge bin (9), the shielding plate (91) is connected with a rotating shaft, both ends of the rotating shaft are rotatably connected with the discharge bin (9), and one end of the rotating shaft is connected with a third driving motor (92).

9. The pulsed grain drying fluidized bed of claim 1, wherein, The upper part of the air injection pipeline (4) is provided with a mesh plate (41), the lower part of the air injection pipeline (4) is connected with a plurality of air blowing devices through a plurality of branch pipelines (6), the air blowing device is connected with a control valve, and the branch pipeline (6) and the exhaust pipeline (3) are provided with temperature detection sensors.

10. The pulsed grain drying fluidized bed of claim 1, wherein, The top of the feeding bin (1) is connected with a material level detection mechanism (16), the material level detection mechanism (16) comprises a fixed rod (161), the fixed rod (161) is fixedly connected with the top wall of the feeding bin (1), the lower part of the fixed rod (161) is fixedly connected with a fixed plate (162), the fixed plate (162) is provided with a detection switch, the fixed plate (162) is rotatably connected with a baffle (163), the detection switch is arranged on the side of the fixed plate (162) close to the baffle (163), and a rebound structure is arranged between the baffle (163) and the fixed plate (162).

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