A rotary drum dryer for compound fertilizer processing

Abstract

The invention relates to the technical field of a rotary drum dryer for compound fertilizer, and specifically to a rotary drum dryer for compound fertilizer processing, comprising a supporting mechanism arranged on a bottom plate, wherein a drying mechanism and a reflux mechanism are arranged on the supporting mechanism; the invention can timely dry and filter the hot air in the drying mechanism through the reflux mechanism, and can also quickly and reasonably replace the drying filter element during the operation of the rotary drum dryer; the invention can not only perform multi-stage drum drying on the compound fertilizer through the cooperation of the drying mechanism and the reflux mechanism, but also the hot air and the compound fertilizer flow in opposite directions during each stage of drum drying, thereby not only greatly improving the overall heat exchange efficiency between the hot air and the compound fertilizer, but also greatly reducing the overall heat loss and improving the overall utilization efficiency of the hot air, thereby not only reducing the overall processing cost of the compound fertilizer, but also greatly improving the overall drying efficiency of the compound fertilizer.

Description

Technical Field

[0001] The invention relates to the technical field of a rotary drum dryer for compound fertilizer, in particular to a rotary drum dryer for compound fertilizer processing. Background Art

[0002] A rotary drum dryer, also known as a drum dryer, can be used to dry various wet materials such as compound fertilizers. Usually, hot air is fully in contact with the compound fertilizer in the drum to achieve the purpose of quickly drying the moisture inside the compound fertilizer. In the prior art, when compound fertilizers are dried by a rotary drum dryer, the compound fertilizer is generally continuously input from one end of the drum, and the drum is continuously rotated in one direction to continuously stir and transport the compound fertilizer in one direction, and high-temperature hot air is simultaneously introduced into the drum, so that the hot air can continuously and fully contact and dry the moisture inside the compound fertilizer.

[0003] Traditional drum dryers are mainly divided into single-stage drum drying and multi-stage drum drying. However, the above two types of drum dryers have the following problems in drying compound fertilizers: 1. In the prior art, a single-stage drum drying drum dryer usually has only a single drum. Although this type of drum dryer uses hot air and compound fertilizer to flow in opposite directions to improve heat exchange efficiency for drying, since the single drum is in direct contact with the external environment, the drum has a poor thermal insulation effect, heat is easily lost quickly, and the overall utilization efficiency of hot air is low. In addition, in order to ensure the overall drying effect, the length of the single drum needs to be extended as much as possible to ensure that the compound fertilizer in the drum is in sufficient contact with the hot air, which will result in a larger overall longitudinal footprint of the drum dryer, which in turn leads to a higher space cost for the overall processing of compound fertilizers; 2. In the technology, a rotary drum dryer of multi-stage drum drying is usually composed of multiple concentric drums installed in sequence. Since the conveying direction of the compound fertilizer in the multi-stage drum will change many times, in order to ensure that the compound fertilizer is fully in contact with the hot air, this rotary drum dryer usually adopts the method of co-flow of hot air and compound fertilizer for drying. Although the above drying method avoids the heat loss of the internal drum and improves the overall heat utilization efficiency, and the overall structure is more compact and occupies a smaller area, the co-flow drying method not only has a low overall heat exchange efficiency, but also in the second half of the compound fertilizer conveying path, since the hot air continues to contact the compound fertilizer and is not dried in time, the moisture in the hot air will increase rapidly, resulting in low drying efficiency and poor effect of the hot air on the compound fertilizer in the second half, which leads to the need to further improve the overall drying efficiency of the compound fertilizer. Summary of the invention

[0004] To achieve the above objectives, the present invention provides the following technical solutions: A rotary drum dryer for compound fertilizer processing, comprising a bottom plate, a supporting mechanism is arranged on the upper side of the bottom plate, a drying mechanism and a reflux mechanism located at the rear side of the drying mechanism are arranged on the supporting mechanism.

[0005] The supporting mechanism comprises an input component arranged on the upper side of the bottom plate and a supporting component located inside the input component. The input component is provided with a material guiding component located inside the drying mechanism.

[0006] The drying mechanism comprises a drum assembly rotatably arranged on the input assembly and a driven assembly arranged outside the drum assembly.

[0007] The reflux mechanism includes multiple groups of guide members evenly arranged on the rear side of the input component, each group of guide members is composed of two symmetrically distributed guide pipes, the front ends of the two symmetrical guide pipes are respectively connected to the primary drying tank and the secondary drying tank, a cover net is installed in the front end of the guide pipe, and a docking component is commonly arranged between the symmetrical guide pipes, a loading component and a positioning component are arranged on the docking component, and a storage component is arranged in the docking component.

[0008] Preferably, the input component includes a front rotating frame and a rear rotating frame which are fixedly arranged on the upper side of the base plate at a front-to-rear interval, the front rotating frame is fixedly provided with an air inlet pipe and an L-shaped air outlet pipe located above the air inlet pipe, and the rear ends of the air inlet pipe and the L-shaped air outlet pipe are both installed with cover nets, the rear rotating frame is fixedly provided with a feed pipe, and a discharge port is opened on the rear rotating frame and below the feed pipe.

[0009] Preferably, the material guide assembly includes a fixed rod fixedly arranged between the air inlet pipe and the feed pipe through a support, and material guide inclined plates are evenly fixedly arranged on the fixed rod front and back, and ventilation grooves that pass through the front and back are opened on the material guide inclined plates.

[0010] Preferably, the supporting assembly includes a pad, and pads are symmetrically installed on both sides of the front and rear ends of the upper end of the base plate, and a plurality of support frames with uniformly varying heights are evenly fixed on the left and right sides of the upper side of the pad, wherein the heights of the support frames corresponding to the pad on the front side of the base plate are all proportionally increased with the heights of the support frames corresponding to the pad on the rear side of the base plate, and a rotating shaft is commonly fixed between the front and rear symmetrical support frames on the same side of the corresponding base plate, and a rotating wheel is rotatably arranged on each rotating shaft, a fixed seat is fixedly arranged on the upper side of the base plate and between the front and rear groups of pads, a motor is fixedly arranged on the front side of the fixed seat, and a gear is fixedly arranged on the driving end of the motor.

[0011] Preferably, the drum assembly includes an inner drum rotatably arranged between the front rotating frame and the rear rotating frame, a primary drying groove is opened inside the inner drum, a plurality of groups of stirring members 1 are evenly fixedly arranged on the inner surface of the inner drum front and back, each group of stirring members 1 is composed of a plurality of oblique stirring plates 1 evenly distributed in the circumferential direction, an outer drum connected to and rotatably connected with the front rotating frame and the rear rotating frame is fixedly arranged on the outer side of the inner drum through a plurality of rod members 1, the outer drum is shaped as a frustum which is small in front and large in the rear, a secondary drying groove is opened together inside the outer drum and outside the inner drum, a plurality of groups of stirring members 2 are evenly fixedly arranged on the inner surface of the outer drum front and back, each group of stirring members 2 is composed of a plurality of oblique stirring plates 2 evenly distributed in the circumferential direction, and the oblique stirring plates 2 are vertically distributed with the corresponding oblique stirring plates 1.

[0012] Preferably, the driven assembly includes two groups of connecting parts that are evenly fixed front and rearly on the outside of the outer drum, each group of connecting parts is composed of a plurality of connecting rods 1 that are evenly distributed circumferentially, and the ends of the connecting rods 1 in the same group that are away from the outer drum are commonly fixed with docking rings that are rollingly connected to the corresponding rotating wheels, and a plurality of connecting rods 2 are evenly fixed circumferentially on the outside of the outer drum and between the two groups of connecting rods 1, and the ends of all the connecting rods 2 that are away from the outer drum are commonly fixed with gear rings that mesh with the gears.

[0013] Preferably, the docking assembly includes a filling seat fixedly arranged between symmetrical guide tubes, end plates fixedly connected to the rear ends of the corresponding guide tubes are symmetrically fixedly arranged at both ends of the filling seat, and through filling ports are provided on the two symmetrical end plates, and a partition is fixedly arranged in the middle of the filling seat, and a through blanking port and a docking port are jointly provided on the partition plate and the corresponding two end plates, wherein the docking port is aligned and connected with the corresponding two guide tubes, and the diameter of the docking port is smaller than the diameter of the guide tube, the filling port and the blanking port.

[0014] Preferably, the feeding assembly includes a connecting shaft fixedly arranged on the side of the end plate away from the partition plate, a connecting plate 1 is rotatably arranged on the connecting shaft, a through limiting hole is opened on the connecting plate 1, a circular baffle aligned with the corresponding filling port is fixedly arranged on the end of the connecting plate 1 away from the connecting shaft, wherein the diameter of the circular baffle is larger than the diameter of the filling port, a connecting plate 2 is fixedly arranged on the end of the connecting shaft away from the end plate, a spring seat is fixedly arranged on the end of the connecting plate 2 away from the connecting shaft, and a telescopic clip that is plugged into and cooperates with the limiting hole is elastically and slidably arranged on the spring seat.

[0015] Preferably, the material storage assembly includes a rotating material bin which is symmetrically rotatably arranged in a filling seat and located between corresponding end plates and partitions, four insertion holes are evenly arranged on the side surface of the rotating material bin, and four material storage grooves which respectively correspond to the insertion holes and are connected are evenly arranged on the rotating material bin, wherein the diameter of the material storage groove is smaller than the diameter of the corresponding filling port and the material drop port, a drying filter element is slidably arranged in the material storage groove, and a through groove is arranged in the middle of the drying filter element.

[0016] Preferably, the positioning assembly includes arc grooves symmetrically opened on the side surface of the filling seat, and the two symmetrical arc grooves correspond one by one to the two rotating silos in the corresponding filling seat, wherein the two ends of the arc groove are respectively aligned with the two adjacent sockets on the corresponding rotating silo, and positioning seats are symmetrically fixed on the side surface of the filling seat, and the two symmetrical positioning seats are fixed with levers on the opposite sides through bolts, and the lever is provided with positioning holes that are connected to and pass through the bolts, and an insertion rod that is plug-in-matched with the corresponding socket is fixed on one end of the lever close to the rotating silo, and the insertion rod is slidably connected to the corresponding arc groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention can timely dry and filter the hot air in the drying mechanism through the reflux mechanism, thereby greatly improving the drying efficiency and drying effect of the hot air in the second half of the conveying path, and can also quickly and reasonably replace the drying filter element during the operation of the drum dryer, thereby not only ensuring the working efficiency of the dryer and the overall drying efficiency of the compound fertilizer, but also further controlling the overall processing cost of the compound fertilizer.

[0018] 2. The present invention can not only perform multi-stage drum drying on the compound fertilizer through the cooperation of the drying mechanism and the reflux mechanism, but also the hot air and the compound fertilizer flow in opposite directions during each stage of drum drying, thereby greatly improving the overall heat exchange efficiency between the hot air and the compound fertilizer, and greatly reducing the overall heat loss and improving the overall utilization efficiency of the hot air, thereby not only reducing the overall processing cost of the compound fertilizer, but also greatly improving the overall drying efficiency of the compound fertilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 It is a schematic side cross-sectional view of the structure of the present invention.

[0021] Figure 3 It is a partial cross-sectional schematic diagram of the reflux mechanism structure.

[0022] Figure 4 for Figure 3 Enlarged schematic diagram at point A in the middle.

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the reflux mechanism viewed from above.

[0024] Figure 6 Schematic diagram of the conveying direction of compound fertilizer (the conveying direction is shown by arrows).

[0025] Figure 7 Schematic diagram of hot air flow direction (flow direction is shown by arrows).

[0026] In the figure: 1, bottom plate; 2, supporting mechanism; 21, input assembly; 211, front rotating frame; 212, air inlet pipe; 213, L-shaped air outlet pipe; 214, rear rotating frame; 215, feed pipe; 216, discharge port; 22, material guide assembly; 221, fixing rod; 222, material guide inclined plate; 223, ventilation slot; 23, supporting assembly; 231, pad; 232, supporting frame; 233, rotating shaft; 234, rotating wheel; 235, fixing seat; 236, motor; 237, gear; 3, drying mechanism; 31, drum assembly; 311, inner drum; 312, primary drying tank; 313, oblique stirring plate 1; 314, outer drum; 315, secondary drying tank; 316, oblique stirring plate 2; 32, driven assembly; 3 21. Connecting rod one; 322. Docking ring; 323. Connecting rod two; 324. Gear ring; 4. Reflux mechanism; 41. Guide pipe; 42. Docking assembly; 421. Filling seat; 422. End plate; 423. Partition plate; 424. Filling port; 425. Dropping port; 426. Docking port; 43. Feeding assembly; 431. Coupling shaft; 432. Connecting plate one; 433. Limiting hole; 434. Circular baffle; 435. Connecting plate two; 436. Spring seat; 437. Telescopic clamp; 44. Storage assembly; 441. Rotating silo; 442. Plug hole; 443. Storage trough; 444. Drying filter element; 45. Positioning assembly; 451. Arc groove; 452. Positioning seat; 453. Push rod; 454. Positioning hole; 455. Plug rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 A rotary drum dryer for compound fertilizer processing comprises a bottom plate 1, a supporting mechanism 2 is arranged on the upper side of the bottom plate 1, a drying mechanism 3 and a reflux mechanism 4 located at the rear side of the drying mechanism 3 are arranged on the supporting mechanism 2.

[0029] See also Figure 1 and Figure 2 The supporting mechanism 2 includes an input component 21 arranged on the upper side of the bottom plate 1 and a support component 23 located inside the input component 21 . The input component 21 is provided with a material guiding component 22 located inside the drying mechanism 3 .

[0030] See also Figure 1 and Figure 2The input assembly 21 includes a front rotating frame 211 and a rear rotating frame 214 which are fixedly arranged on the upper side of the bottom plate 1 at a front-to-back interval. An air inlet pipe 212 and an L-shaped air outlet pipe 213 located above the air inlet pipe 212 are fixedly arranged on the front rotating frame 211. Cover nets are installed in the rear ends of the air inlet pipe 212 and the L-shaped air outlet pipe 213. A feed pipe 215 is fixedly arranged on the rear rotating frame 214. A discharge port 216 is provided on the rear rotating frame 214 and below the feed pipe 215.

[0031] See also Figure 2 The material guide assembly 22 includes a fixed rod 221 fixedly arranged between the air inlet pipe 212 and the feed pipe 215 through a support, and a material guide inclined plate 222 is evenly fixedly arranged on the fixed rod 221 in front and back, and a ventilation groove 223 is opened on the material guide inclined plate 222 to pass through the front and back.

[0032] See also Figure 1 and Figure 2 The support assembly 23 includes a pad 231, and pads 231 are symmetrically installed on the front and rear sides of the upper end of the base plate 1. A plurality of support frames 232 with uniformly changing heights are evenly fixed on the upper side of the pad 231, wherein the heights of the support frames 232 corresponding to the pad 231 on the front side of the base plate 1 are all proportionally increased by the heights of the support frames 232 corresponding to the pad 231 on the rear side of the base plate 1, and a rotating shaft 233 is fixedly arranged between the front and rear symmetrical support frames 232 on the same side of the corresponding base plate 1, and a rotating wheel 234 is rotatably arranged on each rotating shaft 233, and a fixed seat 235 is fixedly arranged on the upper side of the base plate 1 and between the front and rear groups of pads 231, and a motor 236 is fixedly arranged on the front side of the fixed seat 235, and a gear 237 is fixedly arranged on the driving end of the motor 236.

[0033] See also Figure 1 and Figure 2 The drying mechanism 3 includes a drum assembly 31 rotatably disposed on the input assembly 21 and a driven assembly 32 disposed outside the drum assembly 31 .

[0034] See also Figure 2The drum assembly 31 includes an inner drum 311 rotatably arranged between the front rotating frame 211 and the rear rotating frame 214, a primary drying groove 312 is opened inside the inner drum 311, a plurality of groups of stirring members 1 are evenly fixedly arranged on the inner surface of the inner drum 311, each group of stirring members 1 is composed of a plurality of oblique stirring plates 313 evenly distributed in the circumferential direction, an outer drum 314 is fixedly arranged on the outer side of the inner drum 311 through a plurality of rods 1 and is rotatably connected to the front rotating frame 211 and the rear rotating frame 214, the outer drum 314 is shaped like a frustum that is small in front and large in the back, a secondary drying groove 315 is opened inside the outer drum 314 and outside the inner drum 311, a plurality of groups of stirring members 2 are evenly fixedly arranged on the inner surface of the outer drum 314, each group of stirring members 2 is composed of a plurality of oblique stirring plates 2 316 evenly distributed in the circumferential direction, and the oblique stirring plates 2 316 are vertically distributed with the corresponding oblique stirring plates 1 313.

[0035] The inner drum 311 and the outer drum 314 are continuously rotated in one direction, and the compound fertilizer is continuously transported from the feed pipe 215 to the primary drying tank 312 in the inner drum 311. Figure 6 As shown in the figure, the compound fertilizer transported into the rear end of the primary drying tank 312 is continuously stirred and transported forward under the action of the oblique stirring plate 313, wherein the guide inclined plate 222 can cooperate with the continuous rolling of the inner drum 311 to further stir the compound fertilizer on the lower side of the primary drying tank 312, and simultaneously transport the compound fertilizer to the front side of the primary drying tank 312 to avoid excessive accumulation of compound fertilizer on the lower side of the primary drying tank 312. The compound fertilizer then falls from the front end of the primary drying tank 312 into the secondary drying tank 315. 6 is vertically distributed with the corresponding oblique stirring plate 1 313, so when the outer drum 314 and the inner drum 311 rotate synchronously in the same direction, the oblique stirring plate 2 316 will continuously stir the compound fertilizer in the secondary drying tank 315 and transport it backwards, and because the outer drum 314 is a truncated cone shape with a small front and a large rear, under the synchronous action of the oblique stirring plate 2 316 and gravity, the compound fertilizer in the secondary drying tank 315 will be sent out from the discharge port 216, wherein the cover net installed at the rear end of the air inlet pipe 212 and the L-shaped air outlet pipe 213 can block the compound fertilizer.

[0036] High-temperature hot air is continuously input into the primary drying tank 312 through the air inlet pipe 212. Figure 7 As shown, the hot air continues to flow backwards. Since the feed pipe 215 is continuously transporting compound fertilizer into the inner drum 311, the hot air cannot escape from the feed pipe 215 and can only be continuously input into the secondary drying tank 315 through the reflux mechanism 4, wherein the reflux mechanism 4 can fully absorb moisture and dry the hot air flowing through. After the hot air enters the secondary drying tank 315, it flows toward the front side and is finally output from the L-shaped air outlet duct 213.

[0037] When the compound fertilizer is to be dried, the inner drum 311 and the outer drum 314 are firstly made to rotate continuously in one direction, and then the compound fertilizer is continuously input into the primary drying tank 312 through the feeding pipe 215, and at the same time, the high-temperature hot air is continuously input into the primary drying tank 312 through the air inlet pipe 212, and the compound fertilizer in the primary drying tank 312 is continuously stirred and transported forward, and the hot air continuously flowing backward in the primary drying tank 312 flows in the opposite direction to the compound fertilizer and fully contacts, thereby performing the first convection drying on the compound fertilizer in the primary drying tank 312, and as the compound fertilizer falls from the primary drying tank 312 into the secondary drying tank 315 and is continuously input backward, the hot air also synchronously passes through the reflux mechanism 4 into the secondary drying tank 315 and is continuously transported forward, and the secondary drying The hot air dried by the reflux mechanism 4 in the drying tank 315 then flows in the opposite direction to the compound fertilizer again and fully contacts with it, thereby performing a second convection drying on the compound fertilizer in the secondary drying tank 315, and finally the fully dried compound fertilizer is discharged from the discharge port 216, while the hot air is discharged from the L-shaped air outlet duct 213. The above-mentioned drying method can not only perform multi-stage drum drying on the compound fertilizer, but also the hot air and the compound fertilizer flow in the opposite direction during each stage of drum drying, thereby greatly improving the overall heat exchange efficiency between the hot air and the compound fertilizer, and greatly improving the overall utilization efficiency of the hot air. At the same time, the hot air is dried and filtered in time by the reflux mechanism 4, which can greatly improve the drying efficiency and drying effect of the hot air in the second half of the conveying path.

[0038] See also Figure 1 and Figure 2 The driven assembly 32 includes two groups of connecting parts that are evenly fixed on the outside of the outer drum 314 front and back, each group of connecting parts is composed of a plurality of connecting rods 321 evenly distributed in the circumferential direction, and the ends of the connecting rods 321 in the same group that are away from the outer drum 314 are fixedly provided with a docking ring 322 that is rollingly connected to the corresponding rotating wheel 234, and a plurality of connecting rods 323 are evenly fixedly provided on the outside of the outer drum 314 and between the two groups of connecting rods 321 in the circumferential direction, and the ends of all the connecting rods 323 that are away from the outer drum 314 are fixedly provided with a gear ring 324 that is meshed with the gear 237.

[0039] When the inner drum 311 and the outer drum 314 are driven to rotate continuously in one direction, the motor 236 drives the gear 237 to rotate, and the gear 237 then drives the outer drum 314 and the inner drum 311 to rotate by meshing with the gear ring 324, wherein the rotating wheel 234 can ensure the stability of the overall rotation of the inner drum 311 and the outer drum 314 by rolling cooperation with the docking ring 322 that rotates synchronously with the outer drum 314.

[0040] See also Figure 1 , Figure 2 and Figure 3The reflux mechanism 4 includes a plurality of groups of flow guides evenly and fixedly arranged on the rear side of the rear rotating frame 214, each group of flow guides is composed of two symmetrically distributed flow guide pipes 41, the front ends of the two symmetrical flow guide pipes 41 are respectively connected to the primary drying tank 312 and the secondary drying tank 315, a cover net is also installed in the front end of the flow guide pipe 41, and a docking assembly 42 is commonly arranged between the symmetrical flow guide pipes 41, a loading assembly 43 and a positioning assembly 45 are arranged on the docking assembly 42, and a storage assembly 44 is arranged in the docking assembly 42.

[0041] See also Figure 3 and Figure 5 The docking assembly 42 includes a filling seat 421 fixedly arranged between the symmetrical guide tubes 41, and end plates 422 fixedly connected to the rear ends of the corresponding guide tubes 41 are symmetrically fixedly arranged at both ends of the filling seat 421, and a through filling port 424 is opened on the two symmetrical end plates 422, and a partition plate 423 is fixedly arranged in the middle of the filling seat 421, and a through blanking port 425 and a docking port 426 are jointly opened on the partition plate 423 and the corresponding two end plates 422, wherein the docking port 426 is aligned and connected with the corresponding two guide tubes 41, and the diameter of the docking port 426 is smaller than the diameter of the guide tube 41, the filling port 424 and the blanking port 425.

[0042] See also Figure 3 and Figure 4 The feeding assembly 43 includes a connecting shaft 431 fixedly arranged on the side of the end plate 422 away from the partition plate 423, a connecting plate 1 432 is rotatably arranged on the connecting shaft 431, a through limiting hole 433 is opened on the connecting plate 1 432, a circular baffle 434 aligned with the corresponding filling port 424 is fixedly arranged on the end of the connecting plate 1 432 away from the connecting shaft 431, wherein the diameter of the circular baffle 434 is larger than the diameter of the filling port 424, a connecting plate 2 435 is fixedly arranged on the end of the connecting shaft 431 away from the end plate 422, a spring seat 436 is fixedly arranged on the end of the connecting plate 2 435 away from the connecting shaft 431, and a telescopic clamp 437 that is plugged into and matched with the limiting hole 433 is elastically and slidably arranged on the spring seat 436.

[0043] See also Figure 3 and Figure 5 The material storage component 44 includes a rotating material bin 441 which is symmetrically rotatably arranged in the filling seat 421 and is located between the corresponding end plate 422 and the partition plate 423. Four insertion holes 442 are evenly opened on the side surface of the rotating material bin 441. Four material storage grooves 443 which correspond to the insertion holes 442 one by one and are connected are evenly opened on the rotating material bin 441, wherein the diameter of the material storage groove 443 is smaller than the diameter of the corresponding filling port 424 and the drop port 425. A drying filter element 444 is slidably arranged in the material storage groove 443, and a through groove is opened in the middle of the drying filter element 444.

[0044] When the hot air flows from the primary drying tank 312 into the secondary drying tank 315 through the paired guide pipes 41, the two drying filter elements 444 aligned with the docking port 426 filter the moisture and some impurities in the hot air flowing through the internal grooves, thereby improving the drying efficiency and drying effect of the hot air in the latter half of the conveying path.

[0045] When a new drying filter element 444 is to be added to the rotating silo 441, first align the vacant storage slot 443 in the rotating silo 441 with the corresponding filling port 424, then insert the new drying filter element 444 into the corresponding storage slot 443 through the filling port 424, then rotate the connecting plate 1 432 to align the circular baffle plate 434 with the filling port 424 and align the corresponding telescopic clamp 437 with the limiting hole 433, so as to position the new drying filter element 444 in the storage slot 443, and finally insert the telescopic clamp 437 into the limiting hole 433 to stably position the connecting plate 1 432 and the circular baffle plate 434.

[0046] See also Figure 3 The positioning assembly 45 includes an arc groove 451 symmetrically opened on the side surface of the filling seat 421, and the two symmetrical arc grooves 451 correspond one by one to the two rotating bins 441 in the corresponding filling seat 421, wherein the two ends of the arc groove 451 are respectively aligned with the two adjacent insertion holes 442 on the corresponding rotating bin 441, and positioning seats 452 are symmetrically fixedly arranged on the side surface of the filling seat 421, and the two symmetrical positioning seats 452 are fixedly provided with a lever 453 on the opposite sides through a bolt, and a positioning hole 454 that is connected to and passes through the bolt is opened on the lever 453, and an insertion rod 455 that is plugged into and matched with the corresponding insertion hole 442 is fixedly arranged on one end of the lever 453 close to the rotating bin 441, and the insertion rod 455 is slidably connected to the corresponding arc groove 451.

[0047] When the dry filter element 444 aligned with the docking port 426 is to be replaced, the insertion rod 455 is first inserted into the corresponding insertion hole 442, and then the insertion rod 455 is driven by the lever 453 to slide toward the other end of the corresponding arc groove 451 until the positioning hole 454 on the lever 453 is aligned with the corresponding positioning seat 452, so that the lever 453 and the corresponding positioning seat 452 can be positioned and fixed by the bolt, and at the same time, driven by the insertion rod 455, the corresponding rotating bin 441 is rotated 90 degrees at a fixed angle and stably positioned, so that the discarded dry filter element 444 can be driven to align with the drop port 425 by the rotating bin 441, and the discarded dry filter element 444 can be passed through the drop port 425. 5 is taken out from the corresponding material storage tank 443, and the rotating material bin 441 can synchronously drive the new drying filter element 444 to align with the corresponding docking port 426, so that the new drying filter element 444 can continue to dry the hot air. The above replacement method can replace the two drying filter elements 444 working simultaneously in the same filling seat 421 respectively, so that during the operation of the rotary drum dryer, the drying filter element 444 can be reasonably replaced according to the contact sequence and contact time between the drying filter element 444 and the hot air and the drying performance of the drying filter element 444, thereby not only ensuring the working efficiency of the dryer and the overall drying efficiency of the compound fertilizer, but also further controlling the overall processing cost of the compound fertilizer.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary drum dryer for compound fertilizer processing, comprising a bottom plate (1), characterized in that: A supporting mechanism (2) is arranged on the upper side of the bottom plate (1), and a drying mechanism (3) and a reflux mechanism (4) located at the rear side of the drying mechanism (3) are arranged on the supporting mechanism (2); The supporting mechanism (2) comprises an input component (21) arranged on the upper side of the bottom plate (1) and a support component (23) located inside the input component (21); a material guide component (22) located inside the drying mechanism (3) is arranged on the input component (21); The drying mechanism (3) comprises a drum assembly (31) rotatably arranged on the input assembly (21) and a driven assembly (32) arranged outside the drum assembly (31); The reflux mechanism (4) comprises a plurality of groups of flow guide members evenly arranged at the rear side of the input assembly (21), each group of flow guide members being composed of two symmetrically distributed flow guide pipes (41), the front ends of the two symmetrical flow guide pipes (41) being respectively connected to the primary drying tank (312) and the secondary drying tank (315), a cover net being installed inside the front ends of the flow guide pipes (41), a docking assembly (42) being arranged between the symmetrical flow guide pipes (41), a loading assembly (43) and a positioning assembly (45) being arranged on the docking assembly (42), and a material storage assembly (44) being arranged inside the docking assembly (42); The material storage assembly (44) comprises a rotating material bin (441) symmetrically arranged in rotation in a filling seat (421) and located between a corresponding end plate (422) and a partition plate (423); four insertion holes (442) are evenly provided on a side surface of the rotating material bin (441); four material storage grooves (443) are evenly provided on the rotating material bin (441) and correspond to the insertion holes (442) one by one and are connected thereto; a drying filter element (444) is slidably provided in the material storage groove (443); The positioning assembly (45) comprises an arc groove (451) symmetrically arranged on the side surface of the filling seat (421), wherein the two symmetrical arc grooves (451) correspond one to one with the two rotating material bins (441) in the corresponding filling seat (421), wherein the two ends of the arc groove (451) are respectively aligned with the two adjacent insertion holes (442) on the corresponding rotating material bin (441), and the positioning seats (452) are symmetrically fixedly arranged on the side surface of the filling seat (421), and the two symmetrical positioning seats (452) are fixedly provided with a lever (453) on one side facing each other through a bolt, and the lever (453) is provided with a positioning hole (454) that is connected to the bolt and passes through, and an insertion rod (455) that is plugged into and matched with the corresponding insertion hole (442) is fixedly arranged on one end of the lever (453) close to the rotating material bin (441), and the insertion rod (455) is slidably connected to the corresponding arc groove (451).

2. A rotary drum dryer for compound fertilizer processing according to claim 1, characterized in that: The input assembly (21) comprises a front rotating frame (211) and a rear rotating frame (214) which are fixedly arranged on the upper side of the bottom plate (1) at a front-to-back interval; an air inlet pipe (212) and an L-shaped air outlet pipe (213) located above the air inlet pipe (212) are fixedly arranged on the front rotating frame (211); a cover net is installed at the rear ends of the air inlet pipe (212) and the L-shaped air outlet pipe (213); a feed pipe (215) is fixedly arranged on the rear rotating frame (214); and a discharge port (216) is provided on the rear rotating frame (214) and below the feed pipe (215).

3. A rotary drum dryer for compound fertilizer processing according to claim 2, characterized in that: The material guide assembly (22) comprises a fixed rod (221) fixedly arranged between the air inlet pipe (212) and the material feed pipe (215) via a support, material guide inclined plates (222) being evenly fixedly arranged on the fixed rod (221) in the front and rear, and a ventilation slot (223) penetrating the front and rear is provided on the material guide inclined plates (222).

4. A rotary drum dryer for compound fertilizer processing according to claim 2, characterized in that: The support assembly (23) comprises a pad (231), and pads (231) are symmetrically installed on both front and rear sides of the upper end of the base plate (1). A plurality of support frames (232) with uniformly varying heights are evenly fixedly arranged on the upper side of the pad (231) on the left and right sides, wherein the heights of the support frames (232) corresponding to the pad (231) on the front side of the base plate (1) are all proportionally increased as the heights of the support frames (232) corresponding to the pad (231) on the rear side of the base plate (1). A rotating shaft (233) is commonly fixedly arranged between the front and rear symmetrical support frames (232) on the same side of the corresponding base plate (1), and a rotating wheel (234) is rotatably arranged on each rotating shaft (233). A fixed seat (235) is fixedly arranged on the upper side of the base plate (1) and located between the front and rear pads (231). A motor (236) is fixedly arranged on the front side of the fixed seat (235), and a gear (237) is fixedly arranged on the driving end of the motor (236).

5. A rotary drum dryer for compound fertilizer processing according to claim 4, characterized in that: The drum assembly (31) comprises an inner drum (311) rotatably arranged between a front rotating frame (211) and a rear rotating frame (214); a primary drying tank (312) is provided inside the inner drum (311); a plurality of groups of stirring members are evenly and fixedly arranged on the inner surface of the inner drum (311) in the front and rear directions; each group of stirring members is composed of a plurality of oblique stirring plates (313) evenly distributed in the circumferential direction; the outer side of the inner drum (311) is fixedly arranged with a plurality of rods connected to the front rotating frame (211) and the rear rotating frame (214); 14) an outer drum (314) connected to rotate together, the outer drum (314) is shaped like a frustum that is smaller in the front and larger in the rear, the inner surface of the outer drum (314) and the outer surface of the inner drum (311) are provided with a secondary drying tank (315), a plurality of groups of stirring members 2 are evenly and fixedly arranged on the inner surface of the outer drum (314) in the front and back, each group of stirring members 2 is composed of a plurality of oblique stirring plates 2 (316) evenly distributed in the circumferential direction, and the oblique stirring plates 2 (316) are vertically distributed with the corresponding oblique stirring plates 1 (313).

6. A rotary drum dryer for compound fertilizer processing according to claim 5, characterized in that: The driven assembly (32) comprises two groups of connecting members uniformly fixedly arranged on the outside of the outer drum (314) at the front and rear ends, each group of connecting members is composed of a plurality of connecting rods (321) uniformly distributed in the circumferential direction, and the ends of the connecting rods (321) in the same group that are away from the outer drum (314) are all fixedly provided with a docking ring (322) that is rollingly connected to the corresponding rotating wheel (234), and a plurality of connecting rods (323) are uniformly fixedly arranged on the outside of the outer drum (314) and between the two groups of connecting rods (321) in the circumferential direction, and the ends of all the connecting rods (323) that are away from the outer drum (314) are all fixedly provided with a gear ring (324) that is meshingly connected to the gear (237).

7. A rotary drum dryer for compound fertilizer processing according to claim 1, characterized in that: The docking assembly (42) comprises a packing seat (421) fixedly arranged between symmetrical flow guide tubes (41); end plates (422) fixedly connected to the rear ends of the corresponding flow guide tubes (41) are symmetrically fixedly arranged at both ends of the packing seat (421); a through packing port (424) is provided on the two symmetrical end plates (422); a partition plate (423) is fixedly arranged in the middle of the packing seat (421); the partition plate (423) and the two corresponding end plates (422) are jointly provided with a through blanking port (425) and a docking port (426); wherein the docking port (426) is aligned and communicated with the two corresponding flow guide tubes (41); and the diameter of the docking port (426) is smaller than the diameters of the flow guide tube (41), the packing port (424) and the blanking port (425).

8. A rotary drum dryer for compound fertilizer processing according to claim 7, characterized in that: The feeding assembly (43) comprises a connecting shaft (431) fixedly arranged on a side of the end plate (422) away from the partition plate (423); a connecting plate 1 (432) is rotatably arranged on the connecting shaft (431); a through-limiting hole (433) is provided on the connecting plate 1 (432); a circular baffle (434) aligned with a corresponding filling port (424) is fixedly arranged on one end of the connecting plate 1 (432) away from the connecting shaft (431); the diameter of the circular baffle (434) is larger than the diameter of the filling port (424); a connecting plate 2 (435) is fixedly arranged on one end of the connecting shaft (431) away from the end plate (422); a spring seat (436) is fixedly arranged on one end of the connecting plate 2 (435) away from the connecting shaft (431); a telescopic clamp (437) pluggably engaged with the limiting hole (433) is elastically slidably arranged on the spring seat (436).

9. A drum dryer for compound fertilizer processing according to claim 7, characterized in that: The diameter of the material storage groove (443) is smaller than the diameters of the corresponding filling port (424) and the material drop port (425), and a through groove is provided in the middle of the drying filter element (444).

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