Continuous drying equipment for nitrogen-potassium fertilizer production

Abstract

The invention relates to the technical field of nitrogen-potassium fertilizer production, in particular to continuous drying equipment for nitrogen-potassium fertilizer production, which comprises a tank body, a conveying mechanism for conveying a fertilizer along a circumferential path is arranged in the tank body, the conveying mechanism comprises a plurality of vertically through vertical cylinders, and the vertical cylinders are annularly and uniformly arranged in the tank body around the axis of the tank body; a feeding hole and an air outlet hole group A are sequentially formed in the top of the tank body along the circumferential path, an air inlet hole group A and a discharging hole are sequentially formed in the bottom of the tank body along the circumferential path, and the air inlet hole group A corresponds to the air outlet hole group A in position. The vertical cylinder is driven to continuously move along the circumferential path, air inlet hole sets A and air outlet hole sets A are correspondingly arranged up and down, hot air provided by the air inlet heating mechanism is blown out upwards from the air inlet hole sets A, waste gas is discharged from the air outlet hole sets A through the drainage mechanism, and continuous drying of the fertilizer is achieved; the retention time of the fertilizer in a drying zone is prolonged, and the drying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of nitrogen-potassium fertilizer production, in particular to continuous drying equipment for nitrogen-potassium fertilizer production. Background Art

[0002] Nitrogen-potassium fertilizer is a fertilizer that contains two key nutrients, nitrogen and potassium. Nitrogen can promote the growth of plant stems and leaves, and assist in chlorophyll synthesis and photosynthesis. Potassium can enhance plant resistance to stress and improve fruit quality. It is suitable for the growth stages of various crops that require simultaneous supplementation of nitrogen and potassium. It can synergistically meet the nutritional needs of plants and help increase production and improve quality.

[0003] Nitrogen and potassium fertilizers need to be dried after production to remove excess moisture. This prevents excessive moisture from causing fertilizer particles to clump, which can affect dispersion during storage, transportation, and subsequent application. It also prevents moisture from causing microbial growth or chemical changes, which can lead to fertilizer deterioration and nutrient loss. Furthermore, dried fertilizers maintain more stable physical properties and are better suited to packaging and storage environments. However, due to the inherent properties of nitrogen and potassium fertilizers, high-temperature drying is not an option, so air drying is often used.

[0004] Traditional air-drying equipment suffers from low processing efficiency. To ensure thorough drying, it is often equipped with a stirring mechanism to break up and mix the fertilizer. However, mechanical stirring can easily over-crush fertilizer particles due to mechanical force, leading to severe pulverization. This not only increases material loss during air drying but also damages the integrity of the particles, affecting the uniformity of subsequent application. Furthermore, traditional nitrogen and potassium fertilizer drying equipment is generally arranged in a straight line, occupying a large space and hindering the rational use of workshop space. Summary of the Invention

[0005] The object of the present invention is to provide a continuous drying device for producing nitrogen and potassium fertilizers to solve the technical problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] A continuous drying device for producing nitrogen and potassium fertilizers comprises a tank body, wherein a conveying mechanism for conveying the fertilizer along a circumferential path is provided in the tank body, the conveying mechanism comprises a plurality of vertically through vertical cylinders, which are uniformly arranged in a ring around the axis of the tank body in the tank body, a feed port and an air outlet group A are sequentially provided on the top of the tank body along the circumferential path, an air inlet group A and a discharge port are sequentially provided on the bottom of the tank body along the circumferential path, the air inlet group A and the air outlet group A correspond in position to each other, an air inlet heating mechanism connected to the air inlet group A is provided on one side of the tank body for forming hot air blown upward from the air inlet group A, and a discharge mechanism connected to the air outlet group A is provided on the other side for discharging exhaust gas from the air outlet group A, when the vertical cylinders move along the circumferential path to positions corresponding to the air outlet group A and the air inlet group A, upwardly flowing hot air is formed in the three to air-dry the fertilizer.

[0008] Preferably, there are at least three air inlet hole groups A, all located on a circular path, and a buffer zone is provided between two adjacent air inlet hole groups A. When the vertical cylinder moves to a position corresponding to the buffer zone, the vertical hot air disappears.

[0009] Preferably, the conveying mechanism also includes a central shaft, an upper orifice plate, a lower orifice plate and a driving device. The central shaft is vertically rotatably installed on the bottom wall of the tank body and extends through and extends to the top of the tank body. Each vertical cylinder is fixed on the circumferential side of the central shaft through a fixed arm. The upper orifice plate is commonly fixed on the top of each vertical cylinder, and the lower orifice plate is commonly fixed on the bottom end. The top of the vertical cylinder is flush with the upper surface of the upper orifice plate and is tightly and movably fitted with the top wall of the tank body. The bottom end of the vertical cylinder is flush with the lower surface of the lower orifice plate and is tightly and movably fitted with the bottom wall of the tank body. The driving device is provided at the top of the tank body, and is used to drive the central shaft to rotate, so as to drive each vertical cylinder to move along a circular path.

[0010] Preferably, the air inlet heating mechanism includes an air inlet tank, a fan and an electric heating net. The air inlet tank is fixed to the outer wall of the tank body through a support and extends vertically. The fan is installed on the air inlet tank. Several layers of electric heating nets are evenly distributed in the air inlet tank below the fan for heating the airflow. An air collecting hood C is fixed at the bottom of the tank body corresponding to the air inlet hole group A. The air collecting hood C covers the air inlet hole group A. The top of the air inlet tank is connected to an air inlet pipe, and the bottom is connected to a guide pipe. The end of the guide pipe is connected to the air inlet hole group A.

[0011] Preferably, the drainage mechanism includes a main drainage pipe and an exhaust fan. The main drainage pipe is fixed to the outer wall of the tank body through a support. The exhaust fan is installed on the main drainage pipe. An air collecting hood D is fixed at the top of the tank body corresponding to the position of the air outlet group A. The air collecting hood D covers the air outlet group A. A drainage pipe is connected to the air collecting hood D, and the end of the drainage pipe is connected to the main drainage pipe.

[0012] Preferably, an air inlet group B is provided at the bottom of the tank body on the downstream side of the air inlet group A and on the upstream side of the discharge port on the circumferential path, an air collecting hood A is fixed at the bottom of the tank body corresponding to the position of the air inlet group B, the air collecting hood A covers the air inlet group B, and the bottom of the air collecting hood A has an air inlet connected to the outside, an air outlet group B is provided at the top of the tank body on the circumferential path corresponding to the position of the air inlet group B, an air collecting hood B is fixed at the top of the tank body corresponding to the position of the air outlet group B, the air collecting hood B covers the air outlet group B, the end of the air inlet pipe is connected to the air collecting hood B, and the air inlet pipe is also connected to a branch pipe, which is connected to the external air, and when the vertical cylinder moves along the circumferential path to the position corresponding to the air outlet group B and the air inlet group B, an upward-flowing cold air flow is formed in the three to cool the dried fertilizer.

[0013] Preferably, a feed hopper is fixed on the top of the tank body, and the bottom of the feed hopper is connected to the feed port. The feed hopper is funnel-shaped and gradually shrinks downward.

[0014] Preferably, an annular outer cover is fixed on the outer wall of the feed hopper, and the cross-section of the outer cover is L-shaped. An annular dust suction chamber is formed between the inner wall of the outer cover and the outer wall of the feed hopper. A dust suction pipe connected to the annular dust suction chamber is connected to the outer wall of the outer cover, and the end of the dust suction pipe is connected to the main exhaust pipe. The top of the outer cover is set higher than the top of the feed hopper, and an annular interception net is fixed between the top of the outer cover and the top of the feed hopper. An anti-bridging mechanism is also provided at the bottom of the feed hopper, which is used to move the fertilizer at the bottom of the feed hopper to prevent bridging.

[0015] Preferably, the anti-bridging mechanism includes a guide rod, a movable rod and a cross-shaped pushing piece. A horizontal sliding hole is provided on the side wall at the bottom of the feed hopper, and the guide rod is slidably installed in the sliding hole. A sliding rod is vertically fixed on the inner wall at the bottom of the feed hopper and on the side opposite to the sliding hole. Two sliding seats are slidingly sleeved on the slide rod, and two movable rods are hingedly installed on the end of the guide rod located in the feed hopper. The two movable rods are arranged in a horizontal figure eight shape, and the other ends of the two movable rods are hinged to the two sliding seats one by one. A cross-shaped pushing piece is fixedly sleeved on the central axis rod, and a roller is rotatably installed on the outer end of the guide rod, and the roller is squeezed and contacted with the outer edge wall of the cross-shaped pushing piece. The cross-shaped pushing piece is used to periodically push the guide rod to translate, and a fixed disk is fixedly sleeved on the guide rod, and a spring is sleeved on the guide rod. One end of the spring is fixed to the fixed disk, and the other end is fixed to the outer wall of the feed hopper.

[0016] Preferably, the driving device includes a driving motor, a main gear and a driven gear, the driven gear is fixed to the top of the central shaft, the driving motor is fixed to the top of the tank body through a bracket, the main gear is fixed to the output shaft of the driving motor and meshes with the driven gear.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] By driving the vertical cylinder to continuously move along a circular path, combined with the upper and lower corresponding arrangement of the air inlet hole group A and the air outlet hole group A, the hot air provided by the air inlet heating mechanism is blown upward from the air inlet hole group A, and the exhaust mechanism discharges the exhaust gas from the air outlet hole group A, thereby achieving continuous drying of the fertilizer. The air inlet hole group A is provided with at least three locations, which prolongs the residence time of the fertilizer in the drying zone and improves the drying efficiency. The gravity drop impact of the fertilizer in the vertical cylinder during the circular motion and the hot air blown out by the air inlet hole group A form pneumatic stirring, replacing traditional mechanical stirring, reducing excessive pulverization of particles caused by mechanical force, reducing flying losses, and ensuring the integrity of the particles. Compared with traditional in-line equipment, it greatly reduces the overall occupied space, improves workshop space utilization, and is more conducive to the compact layout of the production line.

[0019] The feed port and the vertical cylinder correspond periodically to achieve uniform feeding, ensuring the same amount of fertilizer to be dried in each vertical cylinder; the air inlet group A and the air outlet group A form a stable hot air channel, and the vertical cylinder moves at a uniform speed so that each fertilizer particle is exposed to the hot air for a balanced time, significantly improving the consistency of the drying effect.

[0020] The air inlet, air collecting hood A, air inlet hole group B, vertical cylinder, air outlet hole group B, air collecting hood B and air inlet pipe are connected in sequence to form an additional air intake structure, and a cooling airflow is formed in the vertical cylinder. The dried fertilizer can be air-cooled to harden the fertilizer particles and maintain loose fluidity to facilitate subsequent packaging and storage. In addition, when the cooling airflow passes through the vertical cylinder, it can blow the dried fertilizer upward, causing the fertilizer to float irregularly in the vertical cylinder, thereby avoiding excessive accumulation and improving the cooling efficiency of the fertilizer.

[0021] An annular dust suction chamber is formed by the outer cover and the feed hopper, and the negative pressure suction of the discharge mechanism is coordinated to form an annular wind wall to intercept the dust floating when the feed hopper is fed. The dust enters the discharge mechanism through the dust suction pipe and is discharged for treatment, thereby reducing the loss of fertilizer flying, improving the working environment, and reducing dust pollution. The cross-shaped pushing piece periodically pushes the guide rod to move horizontally, driving the movable rod to swing at the bottom of the feed hopper, forming a dynamic dredging structure, effectively preventing fertilizer from bridging at the bottom of the feed hopper, ensuring continuous and smooth feeding, and reducing the decline in production efficiency due to feeding interruptions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the local structure of the conveying mechanism in the present invention; Figure 3 This is a schematic diagram of the local internal structure of the tank body in the present invention; Figure 4 for Figure 2 The structure shown omits the schematic diagram of the tank; Figure 5This is one of the schematic diagrams of the local structure of the tank top in the present invention; Figure 6 This is a schematic diagram of the local structure of the tank bottom in the present invention; Figure 7 It is a schematic diagram of the partial structure of the air inlet heating mechanism and the exhaust mechanism; Figure 8 for Figure 7 A schematic diagram of another perspective of the structure shown; Figure 9 It is a schematic diagram of the partial structure of the air inlet heating mechanism in the present invention; Figure 10 This is the second schematic diagram of the local structure of the tank top in the present invention; Figure 11 It is a schematic cross-sectional view of the local structure of the feed hopper in the present invention; Figure 12 This is one of the partial structural diagrams of the anti-bridging mechanism in the present invention; Figure 13 This is the second schematic diagram of the local structure of the anti-bridging mechanism in the present invention.

[0023] In the figure: 01, air hood A; 011, air inlet; 02, air hood B; 03, air hood C; 04, air hood D; 1, tank body; 11, feed port; 12, air outlet group A; 13, air outlet group B; 14, air inlet group A; 141, buffer zone; 15, air inlet group B; 16, discharge port; 2, conveying mechanism; 21, central shaft; 22, fixed arm; 23, vertical cylinder; 24, upper orifice plate; 25, lower orifice plate; 26, driving device; 261, bracket; 262, driving motor; 263, main gear; 264, driven gear; 3 , air inlet heating mechanism; 31. air inlet tank; 32. fan; 33. electric heating network; 34. air inlet pipe; 341. branch pipe; 35. guide pipe; 351. pressure relief valve; 4. discharge mechanism; 41. main discharge pipe; 42. exhaust fan; 43. discharge pipe; 5. feed hopper; 6. outer cover; 61. annular dust suction chamber; 62. dust suction pipe; 63. annular intercepting net; 7. anti-bridging mechanism; 701. sliding hole; 71. guide rod; 72. sliding rod; 73. sliding seat; 74. movable rod; 75. fixed plate; 76. spring; 77. cross-shaped pushing member; 78. roller. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0026] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0027] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0028] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Example 1

[0029] See also Figures 1-13 The present invention provides a continuous drying device for the production of nitrogen and potassium fertilizers, including a tank body 1. The tank body 1 is installed on a supporting base frame so that the tank body 1 is elevated and arranged to free up bottom space for convenient installation of other components. A conveying mechanism 2 is provided in the tank body 1. The conveying mechanism 2 is used to convey the fertilizer along a circular path, which is distributed around the axis of the tank body 1.

[0030] Specifically, the conveying mechanism 2 includes a central shaft 21, several vertical cylinders 23 and a driving device 26. The vertical cylinders 23 are evenly arranged in a ring around the axis of the tank body 1 in the tank body 1, and are all vertically through-shaped. The central shaft 21 is vertically rotatably installed on the inner bottom wall of the tank body 1 and extends to the top of the tank body 1. Each vertical cylinder 23 is fixed on the circumferential side of the central shaft 21 through a fixed arm 22. The driving device 26 is provided at the top of the tank body 1. The central shaft 21 can be driven to rotate by the driving device 26. Under the fixed connection action of the fixed arm 22, the central shaft 21 drives each vertical cylinder 23 to move along a circular path, thereby allowing the fertilizer to be transferred along a circular path in the tank body 1.

[0031] like Figure 2 and Figure 3 As shown, a feed port 11 and an air outlet group A12 are sequentially provided on the top of the tank body 1 along a circumferential path, and an air inlet group A14 and a discharge port 16 are sequentially provided on the bottom of the tank body 1 along a circumferential path. The air outlet group A12 and the air inlet group A14 are both composed of a plurality of small holes, which can only allow gas to flow, and fertilizer particles cannot pass through. Among them, the positions of the air outlet group A12 and the air inlet group A14 correspond to each other up and down.

[0032] like Figure 1 As shown, one side of the tank body 1 is provided with an air inlet heating mechanism 3 connected to the air inlet hole group A14, which is used to form hot air blown upward from the air inlet hole group A14, and the other side is provided with a discharge mechanism 4 connected to the air outlet hole group A12, which is used to discharge the exhaust gas from the air outlet hole group A12.

[0033] As the driving device 26 works, the vertical cylinder 23 is driven to move in a circular motion. When the top of the vertical cylinder 23 is aligned with the feed port 11, the fertilizer can fall into the vertical cylinder 23 through the feed port 11. In conjunction with the circular motion of the vertical cylinder 23, periodic feeding is achieved. At the same time, the fertilizer falling into the vertical cylinder 23 falls due to gravity, and the large lumps of fertilizer are scattered due to the impact and broken into multiple small pieces of fertilizer, thus achieving pre-crushing. In addition, when the driving device 26 drives the vertical cylinder 23 to rotate at a constant speed, the length of time that each vertical cylinder 23 remains connected to the feed port 11 is consistent, so that the amount of material discharged each time remains basically consistent, thereby ensuring that the amount of fertilizer to be dried in each vertical cylinder 23 is evenly distributed, thereby improving the consistency of drying.

[0034] As the driving device 26 drives the vertical cylinder 23 to continue to move downstream, when the vertical cylinder 23 filled with fertilizer moves along the circumferential path to the position corresponding to the air outlet group A12 and the air inlet group A14, the hot air flow generated by the air inlet heating mechanism 3 flows into the vertical cylinder 23 through the air inlet group A14, forming a strong hot air flow in the vertical cylinder 23, blowing the fertilizer upward, and the fertilizer floats irregularly in the vertical cylinder 23. The high temperature of the air flow can dry the fertilizer, and the hot air flow in the vertical cylinder 23 is finally discharged upward through the air outlet group A12 and discharged by the discharge mechanism 4. As the vertical cylinder 23 continues to move along the circumferential path, when the bottom end is aligned with the discharge port 16, the dried fertilizer can be discharged from the discharge port 16.

[0035] The upward hot air flow is used to carry the fertilizer to float in the vertical cylinder 23, achieving a pneumatic stirring effect. Compared with traditional mechanical stirring, it reduces excessive pulverization of fertilizer particles. In addition, the hot flow is also used to air-dry the fertilizer, killing two birds with one stone.

[0036] like Figure 3 As shown, there are at least three air inlet hole groups A14, all of which are located on a circular path. A buffer zone 141 is provided between two adjacent air inlet hole groups A14. The area of ​​the buffer zone 141 is larger than the cross-sectional area of ​​the vertical cylinder 23. When the vertical cylinder 23 moves to the position corresponding to the buffer zone 141, the hot air is interrupted due to the lack of an air flow channel. Under the action of gravity, the floating fertilizer falls and hits the bottom wall of the tank body 1 again, causing the small pieces of fertilizer to be broken into pieces again.

[0037] The air inlet group A14 and the buffer zone 141 are provided in multiple locations, so that the fertilizer can realize multiple vertical throwing motions on the circumferential path, and the block fertilizer is gradually dried from the outer layer to the inner layer. Combined with multiple gravity fall impacts, the fertilizer lumps can be gradually eliminated, ensuring the uniformity of the fertilizer particle size and improving the drying effect.

[0038] like Figure 10 As shown, the driving device 26 includes a driving motor 262, a main gear 263 and a driven gear 264. The driven gear 264 is fixed to the top of the central shaft 21. The driving motor 262 is fixed to the top of the tank body 1 through the bracket 261. The main gear 263 is fixed to the output shaft of the driving motor 262 and meshes with the driven gear 264. When the driving motor 262 works, its output shaft drives the main gear 263 to rotate. The rotating main gear 263 meshes and drives the driven gear 264 and drives the central shaft 21 to rotate, providing effective drive for the transportation of fertilizer along a circular path. Example 2

[0039] See also Figure 5-Figure 9 The difference between this embodiment and embodiment 1 is that: The air inlet heating mechanism 3 includes an air inlet tank 31, a fan 32 and an electric heating net 33. The air inlet tank 31 is fixed to the outer wall of the tank body 1 through a support and extends vertically. The fan 32 is installed on the air inlet tank 31. Several layers of electric heating nets 33 are evenly distributed below the fan 32 in the air inlet tank 31 to perform multi-stage heating of the air to ensure the heat required for drying. In addition, an air collecting hood C03 is fixed at the bottom of the tank body 1 corresponding to the air inlet hole group A14. The air collecting hood C03 covers the air inlet hole group A14. The top of the air inlet tank 31 is connected to the air inlet pipe 34, and the bottom is connected to the guide pipe 35. The end of the guide pipe 35 is connected to the air inlet hole group A14.

[0040] The fan 32 is operated to draw air into the air inlet tank 31 through the air inlet pipe 34. The air flows downward in the air inlet tank 31. At the same time, the electric heating network 33 is energized and generates heat, which can heat the airflow passing through to form a hot airflow with a temperature reaching the required drying range. The hot airflow flows through the guide pipe 35 to the air inlet hole group A14, and then flows upward into the vertical cylinder 23 through the holes at the air inlet hole group A14 to form a vertical hot airflow, which pneumatically stirs and dries the fertilizer.

[0041] Among them, the fan 32 is a centrifugal fan, which is installed in series on the air inlet tank 31. The specific connection method adopts the existing technology, that is, the centrifugal fan can suck air from the air inlet pipe 34 into the air inlet tank 31, and flow into the guide pipe 35 at high speed. The centrifugal fan is used to ensure that the wind force generated is large enough, which is sufficient to blow the fertilizer clumps upward in the vertical cylinder 23. The structures of the centrifugal fan and the connection are briefly shown in the accompanying drawings.

[0042] The exhaust mechanism 4 includes a main exhaust pipe 41 and an exhaust fan 42. The main exhaust pipe 41 is fixed to the outer wall of the tank body 1 through a support. The exhaust fan 42 is installed on the main exhaust pipe 41. An air collecting hood D04 is fixed at the top of the tank body 1 corresponding to the position of the air outlet group A12. The air collecting hood D04 covers the air outlet group A12. A exhaust pipe 43 is connected to the air collecting hood D04, and the end of the exhaust pipe 43 is connected to the main exhaust pipe 41.

[0043] The hot air after drying flows into the air collecting hood D04 through the air outlet group A12 and converges, and flows into the main exhaust pipe 41 through the exhaust pipe 43. The exhaust fan 42 works to blow the exhaust gas in the main exhaust pipe 41 downstream. The end of the main exhaust pipe 41 is connected to the exhaust gas treatment device (not shown in the figure). The exhaust gas treatment device can be used to treat the exhaust gas before discharging it. At the same time, the exhaust gas treatment device can also recover and reuse the waste heat in the exhaust gas.

[0044] In addition, a pressure relief valve 351 is installed on the flow guide pipe 35, which can effectively relieve pressure when the internal pressure is too high, thereby ensuring the safety of equipment operation. Example 3

[0045] See also Figure 3 、 Figure 5-Figure 8 The difference between this embodiment and embodiment 2 is that: An air inlet group B15 is provided at the bottom of the tank body 1 on the circumferential path, downstream of the air inlet group A14 and upstream of the discharge port 16. An air collecting hood A01 is fixed to the bottom of the tank body 1 at a position corresponding to the air inlet group B15. The air collecting hood A01 covers the air inlet group B15, and the bottom of the air collecting hood A01 has an air inlet 011 connected to the outside. An air outlet group B13 is provided on the top of the tank body 1 at a position corresponding to the position of the air inlet group B15 on the circumferential path. An air collecting hood B02 is fixed on the top of the tank body 1 at a position corresponding to the position of the air outlet group B13. The air collecting hood B02 covers the air outlet group B13. The end of the air inlet pipe 34 is connected to the air collecting hood B02. The air inlet pipe 34 is also connected to a branch pipe 341, which is connected to the external air.

[0046] The air outlet hole group B13 and the air inlet hole group B15 are both composed of a plurality of small holes, which can only allow gas to flow, but fertilizer particles cannot pass through.

[0047] When the fan 32 works to generate negative pressure inside the air inlet tank 31, on the one hand, external air flows into the air inlet tank 31 through the branch pipe 341, thereby realizing continuous replenishment of external air. On the other hand, when the vertical cylinder 23 moves along the circumferential path to the position corresponding to the air outlet group B13 and the air inlet group B15, the air inlet 011, the air collecting hood A01, the air inlet group B15, the vertical cylinder 23, the air outlet group B13, the air collecting hood B02 and the air inlet pipe 34 are connected in sequence to form another air intake structure.

[0048] Specifically, external air is sucked into the air collecting hood A01 through the air inlet 011, flows into the vertical cylinder 23 through the air inlet hole group B15, and flows in the vertical cylinder 23 to form a vertical upward airflow, and finally flows into the air inlet pipe 34 through the air outlet hole group B13 and the air collecting hood B02. The airflow is not heated before passing through the electric heating network 33 and is a cold airflow, which can cool the dried fertilizer in the vertical cylinder 23. In addition, when the cooling airflow passes through the vertical cylinder 23, it can blow the dried fertilizer upward, so that the fertilizer floats irregularly in the vertical cylinder 23, avoiding excessive accumulation and improving the cooling efficiency of the fertilizer.

[0049] Secondly, after cooling the fertilizer, the cooling airflow absorbs heat due to heat exchange with the high-temperature fertilizer, forming a hot airflow with a certain temperature, and finally flows into the air inlet tank 31 to be heated and reused, thereby reducing energy consumption.

[0050] In addition, filters are installed in the air inlet 011 and the branch pipe 341 to filter impurities in the external air to prevent them from mixing into the fertilizer and causing excessive pollution. Example 4

[0051] See also Figure 4 The difference between this embodiment and embodiment 3 is that: An upper orifice plate 24 is fixed to the top of each vertical tube 23, and a lower orifice plate 25 is fixed to the bottom end. Specifically, the top ends of the vertical tubes 23 are inserted and fixed in the holes on the upper orifice plate 24 one by one, and the bottom ends are inserted and fixed in the holes on the lower orifice plate 25 one by one.

[0052] In addition, the top of the vertical cylinder 23 is flush with the upper surface of the upper perforated plate 24 and both are tightly and movably fitted with the inner top wall of the tank body 1. The bottom of the vertical cylinder 23 is flush with the lower surface of the lower perforated plate 25 and both are tightly and movably fitted with the inner bottom wall of the tank body 1.

[0053] During the movement of the vertical cylinder 23 along the circular path, when the vertical cylinder 23 does not overlap with the feed port 11, the air outlet group A12 and the air outlet group B13, the upper orifice plate 24 can be used to block the feed port 11, the air outlet group A12 and the air outlet group B13 respectively; when the vertical cylinder 23 does not overlap with the air inlet group A14, the air inlet group B15 and the discharge port 16, the lower orifice plate 25 can be used to block the air inlet group A14, the air inlet group B15 and the discharge port 16 respectively, to avoid material leakage and large-scale gas leakage, and ensure the stability of the overall operation of the equipment. In addition, the upper orifice plate 24 and the lower orifice plate 25 fix the two ends of each vertical cylinder 23 into a whole, which plays a role in structural reinforcement of the conveying mechanism 2, killing two birds with one stone. Example 5

[0054] See also Figure 1 、 Figure 8 and Figure 10 The difference between this embodiment and embodiment 4 is that: A feed hopper 5 is fixed on the top of the tank body 1. The bottom of the feed hopper 5 is connected to the feed port 11. The feed hopper 5 is funnel-shaped and gradually shrinks downward. After the fertilizer is put into the feed hopper 5, when the vertical cylinder 23 is aligned with the feed port 11, the fertilizer in the feed hopper 5 falls from the feed port 11 into the vertical cylinder 23. In addition, Figure 11 As shown, an annular outer cover 6 is fixed on the outer wall of the feed hopper 5, and the cross-section of the outer cover 6 is L-shaped. An annular dust suction chamber 61 is formed between the inner wall of the outer cover 6 and the outer wall of the feed hopper 5. A dust suction pipe 62 connected to the annular dust suction chamber 61 is connected to the outer wall of the outer cover 6, and the end of the dust suction pipe 62 is connected to the main exhaust pipe 41.

[0055] When the exhaust fan 42 is working to exhaust the gas inside the main exhaust pipe 41, negative pressure is generated inside the main exhaust pipe 41, and the external air flows into the annular dust suction chamber 61 through the top of the outer cover 6, and then flows into the main exhaust pipe 41 through the dust suction pipe 62 to maintain pressure balance. The airflow forms a peripheral wind wall at the top of the feed hopper 5, which can intercept and remove the dust that is dispersed when the fertilizer is added, further achieving a dust reduction effect. The dust flows into the exhaust gas treatment device through the main exhaust pipe 41 and can be further filtered and treated.

[0056] Among them, such as Figure 11 As shown, the top of the outer cover 6 is set higher than the top of the feed hopper 5. The slightly high design of the top of the outer cover 6 can improve the dust interception effect and reduce dust escape. In addition, an annular interception net 63 is fixed between the top of the outer cover 6 and the top of the feed hopper 5. The annular interception net 63 is arranged to be inclined toward the center of the feed hopper 5 so as to intercept the splashing fertilizer and prevent it from falling into the annular dust suction chamber 61. At the same time, the inclined annular interception net 63 can guide the fertilizer falling on it into the feed hopper 5. Example 6

[0057] See also Figure 10 、 Figure 12 and Figure 13 The difference between this embodiment and embodiment 5 is that: An anti-bridging mechanism 7 is also provided at the bottom of the feed hopper 5, which is used to move the fertilizer at the bottom of the feed hopper 5 to prevent bridging. Specifically, the anti-bridging mechanism 7 includes a guide rod 71, a movable rod 74 and a cross-shaped pushing member 77. A horizontally penetrating sliding hole 701 is provided on the side wall at the bottom of the feed hopper 5. The guide rod 71 is slidably installed in the sliding hole 701. A sliding rod 72 is vertically fixed on the inner wall at the bottom of the feed hopper 5 and on the side opposite to the sliding hole 701. Two sliding seats 73 are slidably mounted on the sliding rod 72. The guide rod 71 is located at the end of the feed hopper 5 and is hingedly mounted with two movable rods 74. The two movable rods 74 are arranged in a horizontal figure eight shape. The other ends of the two movable rods 74 are hingedly connected to the two sliding seats 73 in a one-to-one correspondence. A cross-shaped pushing member 77 is fixedly mounted on the central shaft 21. A roller 78 is rotatably mounted on the outer end of the guide rod 71. The roller 78 is squeezed and abutted against the outer edge wall of the cross-shaped pushing member 77. The cross-shaped pushing member 77 is used to periodically push the guide rod 71 to translate. A fixing plate 75 is fixedly sleeved on the guide rod 71 , and a spring 76 is sleeved on the guide rod 71 . One end of the spring 76 is fixed to the fixing plate 75 , and the other end is fixed to the outer wall of the feed hopper 5 .

[0058] Among them, the cross-shaped pushing member 77 has four raised parts and four recessed parts on its circumference, and the raised parts and the recessed parts are arranged alternately, so that the outer edge wall of the cross-shaped pushing member 77 fluctuates, and the raised parts and the recessed parts are both in the shape of arc transitions, ensuring that the contact and extrusion fitting process with the roller 78 is smoother and more stable.

[0059] As the cross-shaped pushing member 77 rotates following the central shaft 21, it can periodically push the guide rod 71 to move deeper into the feed hopper 5 under the action of the friction and extrusion cooperation with the roller 78. When the guide rod 71 extends and moves toward the feed hopper 5, the spring 76 is compressed and elastically stores force. When the roller 78 rolls to the inner recess, the elastic force of the spring 76 pushes the guide rod 71 to slide outward and reset, thereby causing the guide rod 71 to move back and forth horizontally upward.

[0060] Under the limiting action of the sliding cooperation between the sliding seat 73 and the sliding rod 72 and the hinge connection between the movable rod 74, the guide rod 71 and the sliding seat 73, when the guide rod 71 extends and moves toward the feed hopper 5, it can push the two movable rods 74 to swing up and down respectively, and the angle increases. When the guide rod 71 slides outward and resets, the two movable rods 74 swing with a decreasing angle. In this way, a continuously dynamically changing dredging structure can be formed at the smaller inner diameter of the bottom of the feed hopper 5 to continuously move the fertilizer, reduce fertilizer bridging, and ensure smooth fertilizer delivery.

[0061] In addition, the two movable rods 74 are arranged in an eight-shaped arrangement. When the guide rod 71 reciprocates, the two movable rods 74 swing at a changing angle. This process causes the movable rods 74 to move vertically to cover the entire small diameter at the bottom of the feed hopper 5, and has a good anti-blocking effect.

[0062] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field, so the present invention will no longer explain the control method and circuit connection in detail.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A continuous drying device for nitrogen and potassium fertilizer production, comprising a tank body (1), characterized in that: A conveying mechanism (2) for conveying fertilizer along a circumferential path is provided in the tank body (1), wherein the conveying mechanism (2) comprises a plurality of vertically penetrating vertical cylinders (23), and the vertical cylinders (23) are evenly arranged in a circular shape around the axis of the tank body (1) in the tank body (1); The top of the tank body (1) is provided with a feed port (11) and an air outlet group A (12) in sequence along a circumferential path; An air inlet group A (14) and a discharge port (16) are sequentially provided on the bottom of the tank body (1) along a circumferential path, and the positions of the air inlet group A (14) and the air outlet group A (12) correspond to each other; One side of the tank body (1) is provided with an air inlet heating mechanism (3) in communication with the air inlet hole group A (14) for forming hot air blown upward from the air inlet hole group A (14), and the other side is provided with a discharge mechanism (4) in communication with the air outlet hole group A (12) for discharging exhaust gas from the air outlet hole group A (12); When the vertical cylinder (23) moves along the circumferential path to a position corresponding to the air outlet hole group A (12) and the air inlet hole group A (14), upward hot air is formed in the three to dry the fertilizer.

2. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 1, characterized in that: The air inlet hole group A (14) is provided at least three locations, and all are located on a circumferential path; A buffer zone (141) is provided between two adjacent air inlet groups A (14), and when the vertical cylinder (23) moves to a position corresponding to the buffer zone (141), the vertical hot air disappears.

3. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 1, characterized in that: The conveying mechanism (2) further includes a central shaft (21), an upper perforated plate (24), a lower perforated plate (25) and a driving device (26); The central shaft (21) is vertically rotatably mounted on the inner bottom wall of the tank body (1) and extends through and to the top of the tank body (1); Each of the vertical cylinders (23) is fixed to the circumference of the central shaft (21) via a fixing arm (22); An upper perforated plate (24) is commonly fixed on the top end of each vertical cylinder (23), and a lower perforated plate (25) is commonly fixed on the bottom end; The top end of the vertical cylinder (23) is flush with the upper surface of the upper perforated plate (24), and both are tightly and movably fitted with the inner top wall of the tank body (1); The bottom end of the vertical cylinder (23) is flush with the lower surface of the lower perforated plate (25), and both are tightly and movably fitted with the inner bottom wall of the tank body (1); The driving device (26) is provided at the top of the tank body (1) and is used to drive the central shaft (21) to rotate, thereby driving each of the vertical cylinders (23) to move along a circumferential path.

4. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 3, characterized in that: The air inlet heating mechanism (3) comprises an air inlet tank (31), a fan (32) and an electric heating network (33); The air inlet tank (31) is fixed to the outer wall of the tank body (1) via a support and extends vertically; The fan (32) is installed on the air inlet tank (31), and several layers of the electric heating net (33) are evenly distributed below the fan (32) in the air inlet tank (31) for heating the air flow; An air collecting hood C (03) is fixed at the bottom of the tank body (1) at a position corresponding to the air inlet hole group A (14), and the air collecting hood C (03) covers the air inlet hole group A (14); The top of the air inlet tank (31) is connected to an air inlet pipe (34), and the bottom is connected to a flow guide pipe (35), and the end of the flow guide pipe (35) is connected to the air inlet hole group A (14).

5. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 4, characterized in that: The drainage mechanism (4) includes a main drainage pipe (41) and an exhaust fan (42); The main exhaust pipe (41) is fixed to the outer wall of the tank body (1) via a support, and the exhaust fan (42) is installed on the main exhaust pipe (41); An air collecting hood D (04) is fixed at a position corresponding to the position of the air outlet group A (12) on the top of the tank body (1), and the air collecting hood D (04) covers the air outlet group A (12); A drainage pipe (43) is connected to the gas collecting hood D (04), and the end of the drainage pipe (43) is connected to the main drainage pipe (41).

6. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 5, characterized in that: The bottom of the tank body (1) is provided with an air inlet group B (15) on the circumferential path, located downstream of the air inlet group A (14) and upstream of the discharge port (16); An air collecting hood A (01) is fixed at a position corresponding to the position of the air inlet hole group B (15) on the bottom of the tank body (1), and the air collecting hood A (01) covers the air inlet hole group B (15), and the bottom of the air collecting hood A (01) has an air inlet (011) connected to the outside; The top of the tank body (1) is provided with an air outlet group B (13) at a position corresponding to the position of the air inlet group B (15) on the circumferential path; An air collecting hood B (02) is fixed at a position corresponding to the position of the air outlet group B (13) on the top of the tank body (1), and the air collecting hood B (02) covers the air outlet group B (13); The end of the air inlet pipe (34) is in communication with the air collecting hood B (02); The air inlet pipe (34) is also connected to a branch pipe (341), and the branch pipe (341) is connected to the external air; When the vertical cylinder (23) moves along the circumferential path to a position corresponding to the positions of the air outlet hole group B (13) and the air inlet hole group B (15), an upward-flowing cold air flow is formed in the three to cool the dried fertilizer.

7. The continuous drying equipment for nitrogen-potassium fertilizer production according to claim 5, characterized in that: A feed hopper (5) is also fixed on the top of the tank body (1), and the bottom of the feed hopper (5) is connected to the feed port (11); The feed hopper (5) is funnel-shaped and gradually shrinks downwards.

8. The continuous drying equipment for nitrogen and potassium fertilizer production according to claim 7, characterized in that: An annular outer cover (6) is fixed on the outer wall of the feed hopper (5), the cross section of the outer cover (6) is L-shaped, and an annular dust suction chamber (61) is formed between the inner wall of the outer cover (6) and the outer wall of the feed hopper (5); A dust suction pipe (62) communicating with the annular dust suction chamber (61) is connected to the outer wall of the outer cover (6), and a distal end of the dust suction pipe (62) is connected to the main exhaust pipe (41); The top of the outer cover (6) is arranged higher than the top of the feed hopper (5), and an annular interception net (63) is fixed between the top of the outer cover (6) and the top of the feed hopper (5); An anti-bridging mechanism (7) is also provided at the bottom of the feed hopper (5) for moving the fertilizer at the bottom of the feed hopper (5) to prevent bridging.

9. The continuous drying equipment for nitrogen and potassium fertilizer production according to claim 8, characterized in that: The anti-bridging mechanism (7) comprises a guide rod (71), a movable rod (74) and a cross-shaped pushing member (77); A horizontally penetrating sliding hole (701) is provided on the side wall at the bottom of the feed hopper (5), and the guide rod (71) is slidably installed in the sliding hole (701); A sliding rod (72) is vertically fixed on the inner wall at the bottom of the feed hopper (5) and on a side opposite to the sliding hole (701), and two sliding seats (73) are slidably mounted on the sliding rod (72); The guide rod (71) is located in the feed hopper (5) and has two movable rods (74) hingedly mounted on its end portion. The two movable rods (74) are arranged in a horizontal figure eight shape. The other ends of the two movable rods (74) are hinged to the two sliding seats (73) in a one-to-one correspondence; The cross-shaped pushing member (77) is fixedly mounted on the central shaft (21), and a roller (78) is rotatably mounted on the outer end of the guide rod (71), and the roller (78) is pressed and abutted against the outer edge wall of the cross-shaped pushing member (77); The cross-shaped pushing member (77) is used to periodically push the guide rod (71) to translate; A fixed disk (75) is fixedly sleeved on the guide rod (71), and a spring (76) is sleeved on the guide rod (71). One end of the spring (76) is fixed to the fixed disk (75), and the other end is fixed to the outer wall of the feed hopper (5).

10. The continuous drying equipment for nitrogen and potassium fertilizer production according to claim 3, characterized in that: The driving device (26) includes a driving motor (262), a main gear (263) and a driven gear (264); The driven gear (264) is fixed to the top end of the central shaft (21); The driving motor (262) is fixed to the top of the tank body (1) via a bracket (261); The main gear (263) is fixed on the output shaft of the driving motor (262) and meshes with the driven gear (264).

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