Quantitative output system for fertilizer mixing

Abstract

The utility model discloses a fertilizer mixing and quantitative output system. The fertilizer mixing and quantitative output system comprises a mixing assembly, a first conveying assembly, a second conveying assembly and a control assembly, a feeding hopper of the mixing assembly communicates with a mixing set, and the mixing set outputs materials through a guiding set. A first conveying belt of the first conveying assembly is arranged below the guiding set, and a first gravity sensor on the first conveying assembly monitors the weight of materials in real time. A second conveyor belt of the second conveying assembly receives output of the first conveyor belt; a control unit of the control assembly is electrically connected with the display screen, the first conveying belt, the first gravity sensor, the second conveying belt, the mixing set and the guiding set, and automatic regulation and control are achieved. According to the utility model, through the synergistic effect of the feedback of the gravity sensor and the control unit, the mixing and conveying processes are automatically adjusted, the problems of non-uniform stirring and low proportion control precision in the aspect of diversified materials are solved, and the efficiency and the accuracy of fertilizer mixing are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of fertilizer mixing technology, and in particular to a fertilizer mixing quantitative output system. Background Technology

[0002] Spiral mixing technology has long been used in agricultural processing, but its application range and material size are limited by the lack of automation and the inability to control the mixing rate. Traditional mixing technology accelerates the spiral speed, but it cannot fully achieve uniform mixing of materials, making it difficult to effectively ensure that the quality and volume of the mixed products meet standard requirements. This is especially true when dealing with diverse materials, as different material sizes and proportions reduce work efficiency. How to achieve targeted and precise processing has become an urgent problem to be solved. Since traditional technology relies on manual adjustment and cannot adapt to multiple material proportions, a system that can simultaneously meet the requirements of machine automation and the handling of different materials is needed to improve work efficiency and accuracy. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a fertilizer mixing and quantitative output system, which solves the problems of low efficiency and poor accuracy of traditional mixing technology when dealing with diverse materials by realizing the automatic control of mixing rate and output ratio.

[0004] To achieve the aforementioned technical objectives, the technical solution adopted by this utility model is as follows: a fertilizer mixing and quantitative output system, comprising a mixing component, a first conveying component, a second conveying component, and a control component. The mixing component includes a feeding hopper, a first frame, a mixing group, and a guide group. The feeding hopper is mounted on the first frame, and its lower end is connected to the mixing group. The output end of the mixing group is connected to the guide group. The first conveying component includes a first conveyor belt, a first gravity sensor, and a second frame. The first conveyor belt is mounted on the second frame, and its input end is located below the guide group. The first gravity sensor is mounted on the first conveyor belt. The second conveying component includes a second conveyor belt and a third frame. The second conveyor belt is mounted on the third frame, and its input end is located at the output end of the first conveyor belt. The control component includes a display screen, a control unit, and a fourth frame. The display screen is mounted on the fourth frame, and the control unit is electrically connected to the display screen, the first conveyor belt, the first gravity sensor, the second conveyor belt, the mixing group, and the guide group, respectively.

[0005] In some embodiments, the mixing assembly includes a mixing pipeline, a first drive unit, a first coupling, and a stirring rod. The mixing pipeline is disposed below the feed hopper and communicates with the lower part of the feed hopper. The first drive unit is disposed at one end of the mixing pipeline and is electrically connected to the control unit. The first coupling is drive-connected to the first drive unit. The stirring rod is drive-connected to the first drive unit through the first coupling and is coaxial with the mixing pipeline.

[0006] In some embodiments, the stirring rod includes a drive shaft and helical blades. The drive shaft is connected to a first coupling for transmission, and one end of the drive shaft is close to the input end of the guide assembly. The helical blades extend circumferentially along the drive shaft, and the pitch of the helical blades gradually increases from one end of the drive shaft to the other end of the drive shaft in a predetermined gradient.

[0007] In some embodiments, the pitch of the helical blade near the drive shaft is 80 mm, and the pitch of the helical blade near the drive shaft is 120 mm.

[0008] In some embodiments, the guide assembly includes a guide tube disposed at one end of the mixing pipeline, the guide tube being connected to the mixing pipeline, and the guide tube being inclined at a certain angle to the first conveying assembly.

[0009] In some embodiments, the guide assembly further includes a first valve disposed on the guide tube and electrically connected to the control unit.

[0010] In some embodiments, the feed hopper has a wide-mouthed funnel structure from top to bottom, and the inner side of the feed hopper is provided with an ultra-high molecular weight polyethylene wear-resistant layer.

[0011] In some embodiments, the first frame and / or the second frame and / or the third frame and / or the fourth frame are aluminum profiles; the display screen is a configurable touch screen.

[0012] In some embodiments, the first conveying assembly further includes a second drive unit and a second coupling, the second drive unit being disposed on the second frame; the second coupling being disposed between the second drive unit and the first conveyor belt.

[0013] In some embodiments, the second conveying assembly further includes a third drive unit and a third coupling, the third drive unit being disposed on the third frame; the third coupling being disposed between the third drive unit and the second conveyor belt.

[0014] Compared with the prior art, the present invention, employing the above technical solution, has the following beneficial effects: The above technical solution provides a fertilizer mixing and quantitative output system, including a mixing component, a first conveying component, a second conveying component, and a control component. The feed hopper of the mixing component is connected to the mixing group, and the mixing group outputs material through a guide group; the first conveyor belt of the first conveying component is located below the guide group, and a first gravity sensor on it monitors the material weight in real time; the second conveyor belt of the second conveying component receives the output from the first conveyor belt; the control unit of the control component is electrically connected to the display screen, the first conveyor belt, the first gravity sensor, the second conveyor belt, the mixing group, and the guide group, respectively, to achieve automated control. The above technical solution, through the synergistic effect of gravity sensor feedback and the control unit, automatically adjusts the mixing and conveying process, solving the problems of uneven mixing and low proportion control accuracy when dealing with diverse materials, and significantly improving the efficiency and accuracy of fertilizer mixing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the first structure of the fertilizer mixing and quantitative output system described in the specific implementation method;

[0017] Figure 2 This is a schematic diagram of the second structure of the fertilizer mixing and quantitative output system described in the specific implementation method;

[0018] Figure 3 This is a schematic diagram of the third structure of the fertilizer mixing and quantitative output system described in the specific implementation method;

[0019] Figure 4 This is a schematic diagram of the fourth structure of the fertilizer mixing and quantitative output system described in the specific implementation method;

[0020] Figure 5 This is a schematic diagram of the fifth structure of the fertilizer mixing and quantitative output system described in the specific implementation method.

[0021] The attached figures are labeled as follows:

[0022] 1. Mixing components;

[0023] 11. Feed hopper;

[0024] 12. First framework;

[0025] 13. Mixing group;

[0026] 131. Mixing pipeline;

[0027] 132. First drive unit;

[0028] 14. Guiding Group;

[0029] 141. Guide tube;

[0030] 2. First conveying component;

[0031] 21. First conveyor belt;

[0032] 22. Second Framework;

[0033] 23. Second drive unit;

[0034] 3. Second conveying component;

[0035] 31. Second conveyor belt;

[0036] 32. The Third Framework;

[0037] 4. Control components;

[0038] 41. Display screen;

[0039] 42. The fourth framework. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0041] Please see Figures 1 to 5This embodiment provides a fertilizer mixing and quantitative output system, including a mixing component 1, a first conveying component 2, a second conveying component 3, and a control component 4. The mixing component 1 includes a feed hopper 11, a first frame 12, a mixing group 13, and a guide group 14. The feed hopper 11 is mounted on the first frame 12, and the lower part of the feed hopper 11 is connected to the mixing group 13. The output end of the mixing group 13 is connected to the guide group 14. The first conveying component 2 includes a first conveyor belt 21, a first gravity sensor, and a second frame 22. The first conveyor belt 21 is mounted on the second frame 22, and the input end of the first conveyor belt 21 is... The first gravity sensor is located below the guide group 14 and is mounted on the first conveyor belt 21; the second conveying assembly 3 includes a second conveyor belt 31 and a third frame 32, with the second conveyor belt 31 mounted on the third frame 32, and the input end of the second conveyor belt 31 located at the output end of the first conveyor belt 21; the control assembly 4 includes a display screen 41, a control unit, and a fourth frame 42, with the display screen 41 mounted on the fourth frame 42, and the control unit electrically connected to the display screen 41, the first conveyor belt 21, the first gravity sensor, the second conveyor belt 31, the mixing group 13, and the guide group 14 respectively.

[0042] In this embodiment, the feed hopper 11 refers to a funnel-shaped container located on the upper part of the first frame 12, used to receive and mix fertilizer raw materials. It is preferably made of high-strength alloy material, taking into account lightweight, high hardness, and excellent corrosion resistance. The lightweight feature helps to reduce the overall weight of the equipment, making it easier to install and operate; the high hardness characteristic allows it to provide a stable and reliable support for the mixing process, easily bearing the large weight of the fertilizer and ensuring that the equipment remains structurally stable under heavy load conditions; the excellent corrosion resistance allows it to easily cope with the corrosiveness of fertilizer, greatly extending the service life of the funnel and reducing equipment damage and maintenance costs caused by corrosion.

[0043] The first frame 12 is preferably made of European standard 40*40 aluminum profile, and the feed hopper 11 is tightly fixed to the first frame 12 through a professional connection process. This aluminum profile has good rigidity and stability, and its tight connection with the feed hopper 11 can effectively suppress the shaking phenomenon generated by the agitator during operation. Through precise design and installation process, the connection strength and stability between the feed hopper 11 and the first frame 12 are ensured, providing a solid guarantee for the smooth operation of the mixing unit 13, thereby improving the reliability and operating efficiency of the entire system.

[0044] The mixing unit 13 can be a spiral mixer or a paddle mixer, which achieves uniform mixing of materials through rotational motion; the guiding unit 14 can be an inclined guide chute or a vibrating guide plate, which is used to directionally transport the mixed materials to the first conveyor belt 21.

[0045] The fertilizer slides down the guide assembly 14 onto the first conveyor belt 21 of the first conveying assembly 2. The first conveyor belt 21 refers to a rubber belt conveyor mechanism installed on the second frame 22. Its surface can be provided with anti-slip texture to enhance material stability. Preferably, the first conveyor belt 21 of the first conveying assembly 2 is made of a material with high strength and high wear resistance. The rubber layer covering the surface has a Shore A hardness of 60-70, which has excellent tear resistance and anti-slip properties, can effectively bear the weight of the fertilizer and ensure the stability of the conveying process.

[0046] Preferably, the first gravity sensor is a strain gauge or piezoelectric sensor, embedded in the bracket of the first conveyor belt 21, for real-time acquisition of material weight signals. The second frame 22 preferably uses European standard 40*40 aluminum profile. The first conveying assembly 2 is tightly connected to the second frame 22 by high-strength bolts, ensuring installation accuracy within ±0.05mm to guarantee stability during operation. Furthermore, to achieve tension adjustment of the first conveyor belt 21, the driven shaft employs a screw adjustment mechanism. By precisely rotating the screw, the driven shaft can be smoothly moved to a suitable position, allowing the first conveyor belt 21 to achieve the ideal tension, ensuring uniform tension distribution within the first conveyor belt 21, and controlling the tension range between 500-800N.

[0047] Through the above technical solutions, during the process of fertilizer falling from the guide group 14 to the first conveying component 2, problems such as deformation and deviation of the first conveyor belt 21 caused by gravity exceeding the supporting force of the first conveyor belt 21 can be effectively avoided, ensuring stable and reliable operation of the conveying link of the first conveyor belt 21, achieving the design requirements for fertilizer transmission efficiency, and preventing material leakage or spillage. Furthermore, sheet metal skirts (100mm high) are installed on both sides of the first conveyor belt 21 to prevent the impact of environmental wind speed during the conveying process.

[0048] Optionally, the second conveyor belt 31 has a similar structure to the first conveyor belt 21, and the two achieve material relay conveying through the height difference.

[0049] Preferably, the control unit is a PLC or a single-chip microcomputer system, which receives the signal from the first gravity sensor and synchronously adjusts the rotation speed of the mixing group 13, the discharge angle of the guide group 14, and the speed of the conveyor belt.

[0050] The implementation principle of this embodiment can be understood as follows: After the material enters the mixing group 13 through the feed hopper 11 and is crushed and stirred, it is evenly dropped onto the first conveyor belt 21 by the guide group 14; the first gravity sensor monitors the flow rate in real time and feeds the data back to the control unit, and the control unit dynamically adjusts the working parameters of the mixing group 13 and the speed of the first conveyor belt 21; when the material reaches the set weight threshold, the second conveyor belt 31 starts to receive and output, forming a continuous quantitative operation cycle.

[0051] This invention ensures uniform material mixing through the synergistic effect of the mixing group 13 and the guiding group 14. The closed-loop control system composed of the first gravity sensor and the control unit enables precise adjustment of the output ratio. The two-stage conveyor belt design avoids material accumulation and improves conveying efficiency. The entire system completes fertilizer mixing, quantitative and continuous output without manual intervention, effectively solving the technical problems of low accuracy in the proportioning of diverse materials and uneven mixing, and significantly improving the standardization of production and operational stability.

[0052] In some embodiments, the mixing assembly 13 includes a mixing pipeline 131, a first drive unit 132, a first coupling, and a stirring rod. The mixing pipeline 131 is disposed below the feed hopper 11 and communicates with the lower part of the feed hopper 11. The first drive unit 132 is disposed at one end of the mixing pipeline 131 and is electrically connected to the control unit. The first coupling is drive-connected to the first drive unit 132. The stirring rod is drive-connected to the first drive unit 132 through the first coupling and is coaxial with the mixing pipeline 131.

[0053] In this embodiment, the mixing pipeline 131 is a cylindrical structure connected to the feed hopper 11, used to contain and transport the material to be mixed. Preferably, the mixing pipeline 131 is fully enclosed, which creates an ideal environment for fertilizer mixing, avoids external interference, allows the fertilizer to be fully and evenly mixed, improves the mixing effect and product quality, and prevents leakage and scattering of fertilizer during mixing, avoiding waste, improving resource utilization, reducing production costs, and achieving efficient production and resource conservation. After the fertilizer is fully mixed in the mixing pipeline 131, it falls into the guide assembly 14 at the slot at the end of the mixing pipeline 131.

[0054] The first drive unit 132 preferably uses an 86BYGH stepper motor to provide stirring power. The first drive unit 132 and the stirring rod are connected together by a first coupling, which is either a rigid or flexible coupling, used to connect the first drive unit 132 and the stirring rod and transmit torque.

[0055] The stirring rod is preferably a rotating shaft equipped with helical blades or agitator blades, arranged coaxially with the mixing pipeline 131 to achieve material propulsion and mixing. Preferably, a self-lubricating bearing is provided at the rear end of the stirring rod. In the working environment of high-speed rotation of the helical rod and bearing complex loads, the self-lubricating bearing can effectively reduce the coefficient of friction, reduce wear, and greatly reduce the risk of jamming, thereby significantly extending the service life of the entire structure and ensuring that the equipment can operate stably for a long time.

[0056] This embodiment provides a stable environment for fertilizer mixing through a fully enclosed mixing pipeline 131, ensuring thorough mixing while preventing leakage and waste. The first drive unit 132, in conjunction with the first coupling, achieves stable power transmission, driving the mixing rod to operate efficiently. The self-lubricating bearing at the tail of the mixing rod effectively reduces friction loss, significantly improving the equipment's operational reliability and service life. This embodiment, while ensuring mixing uniformity, also features sealing, durability, and high efficiency, making it particularly suitable for fertilizer mixing operations requiring precise proportioning and continuous production.

[0057] In some embodiments, the stirring rod includes a drive shaft and helical blades. The drive shaft is connected to a first coupling for transmission, and one end of the drive shaft is close to the input end of the guide group 14. The helical blades extend circumferentially along the drive shaft, and the pitch of the helical blades gradually increases from one end of the drive shaft to the other end of the drive shaft in a preset gradient.

[0058] In this embodiment, the drive shaft refers to a metal shaft directly connected to the first coupling, used to transmit the rotational power of the first drive unit 132; the helical blades are a continuous helical structure welded or integrally formed on the surface of the drive shaft, with its pitch designed to gradually increase along the material conveying direction, used to achieve progressive mixing and conveying of the material. The gradient change enables the material to receive more intensive mixing at the front end of the mixing pipeline 131, while the conveying speed is accelerated at the rear end, ensuring a balance between mixing uniformity and conveying efficiency.

[0059] This embodiment achieves high-intensity mixing at the front end of the mixing pipeline 131 and improves conveying efficiency at the rear end through a gradient-changing spiral blade design. This ensures thorough mixing of materials and avoids local accumulation, thereby optimizing the mixing and conveying processes and significantly improving the overall smoothness of system operation and the consistency of mixing quality.

[0060] In some embodiments, the pitch of the helical blade near the drive shaft is 80 mm, and the pitch of the helical blade near the drive shaft is 120 mm.

[0061] In this embodiment, by setting the pitch of the spiral blades at one end near the drive shaft to 80 mm and the other end to 120 mm, the spiral blades form a gradually changing pitch structure along the drive shaft. This allows the material to first receive dense mixing from the spiral blades with a smaller pitch when it enters the mixing pipeline 131, ensuring thorough mixing. As the material is conveyed forward, the gradually increasing pitch maintains the mixing effect and improves the conveying efficiency.

[0062] This embodiment effectively balances the relationship between mixing intensity and conveying speed through a gradually varying pitch structure, avoiding local accumulation of materials or insufficient mixing in the mixing pipeline 131. This ensures mixing quality while improving overall production efficiency, achieving optimized coordination between the mixing and conveying processes.

[0063] In some embodiments, the guide assembly 14 includes a guide tube 141, which is disposed at one end of the mixing pipeline 131. The guide tube 141 is connected to the mixing pipeline 131 and is inclined at a certain angle to the first conveying assembly 2.

[0064] In this embodiment, by connecting the guide pipe 141 to the mixing pipe 131 and setting it at a certain angle, the material can be smoothly transferred to the first conveying component 2. Preferably, the guide pipe 141 has a small angle of inclination to avoid segregation.

[0065] This embodiment ensures smooth transfer of materials from the mixing pipeline 131 to the first conveying component 2, while maintaining material uniformity through a moderate tilt angle, preventing stratification of different components during transport. The arrangement of the guide pipe 141 effectively maintains the uniformity of the mixed materials while ensuring conveying efficiency, enabling the system to continuously output a stable ratio of mixed fertilizer, thus improving overall operational quality and stability.

[0066] In some embodiments, the guide assembly 14 further includes a first valve disposed on the guide tube 141 and electrically connected to the control unit.

[0067] In this embodiment, precise control of material output is achieved by installing a first valve electrically connected to the control unit on the guide pipe 141. The control unit can adjust the opening and closing state and opening degree of the first valve in real time based on the feedback signal from the first gravity sensor, thereby precisely controlling the flow rate of material from the guide pipe 141 to the first conveyor belt 21. By adopting the technical solution of this embodiment, material accumulation or flow interruption is avoided, and the accuracy of quantitative output is ensured. This allows the system to flexibly adjust the output rhythm according to actual needs, significantly improving the stability and controllability of fertilizer mixing output.

[0068] In some embodiments, the feed hopper 11 has a wide-mouthed funnel structure from top to bottom, and the inner side of the feed hopper 11 is provided with an ultra-high molecular weight polyethylene wear-resistant layer.

[0069] In this embodiment, the wide-mouth funnel structure facilitates smooth material feeding and avoids clogging; the ultra-high molecular weight polyethylene wear-resistant layer effectively enhances the wear resistance of the feed hopper 11 and extends its service life. By adopting the technical solution of this embodiment, both the smoothness of material feeding and the durability of the feed hopper 11 are ensured, making it particularly suitable for long-term, high-frequency fertilizer mixing operations and providing a reliable guarantee for the stable operation of the system.

[0070] In some embodiments, the first frame 12, the second frame 22, the third frame 32, and the fourth frame 42 are aluminum profiles; the display screen 41 is a configuration touch screen.

[0071] In this embodiment, by using aluminum profiles to construct the first frame 12, second frame 22, third frame 32, and fourth frame 42, the overall structure achieves sufficient mechanical strength while also being lightweight, easy to install and maintain, and corrosion-resistant. The configuration touchscreen, serving as the display screen 41, provides an intuitive human-machine interface, facilitating real-time monitoring and adjustment of system parameters by operators. This ensures both the stability and durability of the equipment structure and enhances the ease of operation, thereby optimizing the overall performance of the fertilizer mixing and quantitative output system.

[0072] In some embodiments, the first conveying assembly 2 further includes a second drive unit 23 and a second coupling, wherein the second drive unit 23 is disposed on the second frame 22; and the second coupling is disposed between the second drive unit 23 and the first conveyor belt 21.

[0073] In this embodiment, by setting a second drive unit 23 and a second coupling in the first conveying assembly 2, the second drive unit 23 directly drives the first conveyor belt 21 through the second coupling, which enhances the stability and reliability of the operation of the first conveyor belt 21. The second coupling effectively transmits power and buffers vibration, ensuring that the first conveyor belt 21 can achieve precise speed adjustment according to the control unit command, thereby keeping in sync with the discharge rhythm of the mixing assembly 1. This avoids material accumulation and ensures the continuity of conveying, significantly improving the accuracy and stability of the system's quantitative output.

[0074] In some embodiments, the second conveying assembly 3 further includes a third drive unit and a third coupling, wherein the third drive unit is disposed on the third frame 32; and the third coupling is disposed between the third drive unit and the second conveyor belt 31.

[0075] In this embodiment, by setting a third drive unit and a third coupling in the second conveying assembly 3, the third drive unit directly drives the second conveyor belt 31 through the third coupling, ensuring the independence and controllability of the operation of the second conveyor belt 31. The third coupling effectively transmits power and reduces mechanical vibration, enabling the second conveyor belt 31 to achieve precise speed adjustment according to material conveying requirements, forming a good match with the output rhythm of the first conveyor belt 21. This ensures the continuity of material conveying and avoids interference between different conveying links, further improving the overall coordination and stability of the system operation.

[0076] Furthermore, the following examples can be derived from the above technical solutions:

[0077] The working principle of the above technical solution can be understood as follows:

[0078] 1. Raw material feeding and gravity conveying system

[0079] Material characteristics adaptation: The feeding port (1) is designed as a wide-mouth funnel structure, which is compatible with agricultural bulk materials with a particle size ≤50mm (such as coarse organic fertilizer particles, compound fertilizer crystals, etc.). The inner wall is lined with a wear-resistant layer of ultra-high molecular weight polyethylene (UHMW-PE) to reduce the friction resistance coefficient (μ≤0.15) and ensure that the material can slide without obstruction under its own weight.

[0080] Electromechanical linkage control: By manually selecting the preset stirring scheme library in the configuration screen, the PLC receives the instruction from the configuration screen and sends a pulse signal (PWM duty cycle ≥75%) to the stepper motor driver (microstepping accuracy 1 / 256), driving the spiral stirring mechanism to perform directional rotational motion with a preset torque (20-50N·m) to avoid start-stop impact.

[0081] 2. PLC integrated control system

[0082] The configuration screen interaction layer uses a 9.9-inch industrial-grade touchscreen (IP65 protection) with built-in SCADA configuration software, supporting the storage and retrieval of formula parameters. The screw speed control range is 0-200 rpm. EDEM simulation is used to model the fertilizer mixing process, ensuring that the coefficient of variation (CV) for mixing uniformity is ≤5%. (A smaller CV indicates that the measured values ​​of each sample are closer to the mean, and the better the mixing uniformity; a larger CV indicates that the differences between samples are greater, and the worse the mixing uniformity.)

[0083] Multi-machine collaborative logic: The spiral mixer and belt conveyor adopt a master-slave control mode. After the mixing is completed, the PLC sends a Modbus-RTU command to the belt conveyor frequency converter (vector control type, overload capacity 150%) to activate the preset belt speed curve (S-shaped acceleration and deceleration, jerk≤0.3m / s³). The reference flow rate threshold is set according to the mass formula Q=ρ·A·v (A is the cross-sectional area of ​​the discharge port, ρ is the bulk density of the material).

[0084] Safety redundancy design: When the motor is overloaded, stalled, or communication is interrupted, the PLC triggers the E-stop emergency stop sequence and records the fault code to the SQL database.

[0085] 3. Dynamic Hybridization and Directional Transmission Mechanism

[0086] Optimized mixing space: The spiral stirring rod adopts a double-head variable pitch design (large end pitch 120mm, small end pitch 80mm), forming axial progressive shear and radial turbulence, and the mixing efficiency is improved by 30% compared with the single pitch structure. The cavity (2) utilizes a closed design to enhance the utilization of materials and make full use of the effect.

[0087] (3) Fluid simulation of the guide chute: Based on the EDEM discrete element simulation, the chute inclination angle (β=15°-25°) and inner wall roughness (Ra=3.2μm) are optimized to achieve a material sliding velocity gradient ≤0.2m / s and avoid segregation.

[0088] 4. Closed-loop metering and conveying system

[0089] Weighing-speed coupling algorithm: The belt conveyor at workstation (4) integrates a high-precision weighing bridge (range 0-500kg, accuracy C3 level), which collects the line load q (kg / m) in real time and calculates the instantaneous mass flow rate Q=q·v by combining the belt speed v (0.5-3.0m / s). The PLC dynamically adjusts the output frequency of the frequency converter (f=10-60Hz) through fuzzy PID, so that the Q value tracks the set value and the error band is ≤±3%.

[0090] To prevent spillage: The belt is equipped with double-sided metal skirts (100mm high) to ensure that materials do not spill into the next process.

[0091] After the bulk material is metered and proportioned by the top hopper (1), it is introduced into the conveying pipeline (2) by gravity flow. Its falling trajectory is optimized by EDEM flow field simulation.

[0092] Construction of Helical Mechanical Force Field

[0093] The stepper motor (model: 86BYGH, rated torque 1.8N·m, step angle 1.8) achieves rigid coupling transmission with the screw conveyor mechanism (3) through the flexible coupling, driving the screw rod to perform directional rotary motion at a speed of 0-200rpm, forming an axial progressive shearing and crushing force field.

[0094] Crushing Dynamics

[0095] Multimodal pulverization mechanism:

[0096] Material particles are subjected to triaxial combined stress (compression / shear / collision) within the gap between the spiral blades, achieving the gradual crushing of coarse particles (initial particle size ≥ 10 mm), with the final particle size distribution conforming to the EDEM simulation particle model (characteristic particle size d). 50 ≤2mm, uniformity index n≥1.5).

[0097] Precision weighing system for belt conveyors

[0098] At the critical load-bearing components of the belt conveyor, a dual-bridge load cell with superior accuracy (meeting the C3 level specified in the OIML R60 standard) is precisely integrated. This sensor employs advanced strain gauge measurement technology. When fertilizer flows dynamically along the belt, a uniformly distributed gravitational load acts on the belt and is then transmitted to the load cell below.

[0099] When subjected to this pressure, the sensor's elastomer structure undergoes extremely subtle but precisely measurable elastic deformation. This deformation causes a corresponding physical change in the high-precision strain gauge attached to the surface of the elastomer, specifically manifested as a precise change in the strain gauge's resistance value.

[0100] The Wheatstone bridge circuit inside the sensor accurately detects and converts these resistance changes into a weak voltage signal. This voltage signal is then transmitted with low interference via a shielded cable to a specially designed signal conditioning and digitization module. The system uses an 86BYGH series two-phase hybrid stepper motor (rated torque 1.8 N·m, step angle 1.8°) coaxially mounted with the spiral stirring shaft and belt conveyor mechanism. A variable frequency pulse signal is generated using the Pulse Frequency Modulation (PFM) module of the programmable logic controller (PLC) based on the formula n = 60f / (θ × N) (where n is the rotational speed in r / min, f is the pulse frequency in kHz, θ is the step angle, and N is the microstepping factor), driving the stepper motor to achieve a speed range of 0-1500 r / min. Stepless speed regulation is achieved by precisely adjusting the output frequency according to preset control logic and parameter settings, thereby changing the stepper motor's operating speed. To achieve visualization and convenient control of system operating parameters, the PLC and configuration panel must be reliably connected via an industrial Ethernet cable. Based on industrial communication protocol standards, a stable data transmission link is built to ensure that the frequency parameters adjusted by the PLC can be transmitted to the configuration panel in real time and accurately, and clearly displayed on the configuration panel's display interface.

[0101] 1. Intelligent speed control system for screw mechanism based on PLC-HMI

[0102] Improvement mechanism:

[0103] By integrating Siemens S7-1200 series PLC and WinCC Advanced configuration panel, a stepless frequency conversion control system for screw speed (speed range: 0-200 rpm) is constructed. Combined with a material property database (20 preset formulas, including parameters such as bulk density, moisture content, and fiber content), dynamic adaptive adjustment is achieved.

[0104] Key innovations:

[0105] Closed-loop control of particle size distribution: By acquiring the torque signal of the screw in real time (range 0-200 N·m, accuracy ±1.5%FS), the D90 particle size of the crushed material is controlled within the range of 0.5-5 mm (the target value can be customized).

[0106] Multimodal operation strategy: For special materials such as high humidity (>30%) and high fiber (straw content >15%), the "low speed high torque" mode (speed ≤30 rpm, motor overload capacity 150%) is activated to avoid stalling; for fragile materials (such as fertilizer granules), the "high speed low filling" mode (speed ≥100 rpm, filling coefficient ≤40%) is switched to improve processing efficiency.

[0107] Performance improvements:

[0108] The mixing uniformity CV value has been optimized from 8-12% for traditional machinery to ≤5% (ISO 5725 standard), and energy consumption has been reduced by 22% (measured 0.65 kWh / t vs. traditional 0.83 kWh / t).

[0109] 2. Precision metering system for belt conveyors that integrates weighing and vision

[0110] Improvement mechanism:

[0111] A dual-bridge load cell (accuracy class C3) is integrated into the belt conveyor to construct a mass-volume dual-feedback metering model. Real-time communication with the PLC via the Modbus-TCP protocol enables dynamic compensation for flow rate errors.

[0112] Multi-source data fusion algorithm:

[0113] The mass flow rate (Qm=ρ·A·v, where ρ is the dynamic density) output by the weighing sensor is achieved with a measurement accuracy of ±1.5% (OIML R50 standard).

[0114] Performance improvements:

[0115] Batch production quality error has been reduced from ±8% under traditional manual control to within ±2% (SGS certified data), while supporting one-click formula switching (switching time <10 s), adapting to the flexible production needs of multiple varieties.

[0116] By adopting the above technical solutions, this utility model differs from the prior art and has the following beneficial effects:

[0117] This invention achieves efficient conveying while ensuring thorough mixing of fertilizer through the synergistic effect of a fully enclosed mixing pipeline 131 and gradient variable pitch spiral blades, effectively preventing material leakage and local accumulation. The feed hopper 11, with its aluminum profile frame structure and ultra-high molecular weight polyethylene wear-resistant layer, combines lightweight, high strength, and corrosion resistance. The guide pipe 141, in conjunction with the precise control of the first valve, maintains the uniformity and stability of material conveying. The two-stage independently driven conveyor belt system of the first conveying component 2 and the second conveying component 3, coupled with a coupling, ensures the coordination and continuity of the conveying process. The intelligent control system, comprised of the control component 4, achieves closed-loop control of mixing parameters and conveying speed. Through the organic combination of structural optimization and intelligent control, this invention significantly improves the uniformity of fertilizer mixing, the accuracy of quantitative output, and the stability of continuous operation, providing an efficient and reliable solution for modern fertilizer production.

[0118] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the contents of this utility model specification and drawings, or directly or indirectly applied to other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fertilizer mixing and quantitative output system, characterized in that, include: The mixing assembly includes a feed hopper, a first frame, a mixing group, and a guide group. The feed hopper is provided on the first frame, and the lower part of the feed hopper is connected to the mixing group. The output end of the mixing group is connected to the guide group. The first conveying assembly includes a first conveyor belt, a first gravity sensor, and a second frame. The second frame is provided with the first conveyor belt, the input end of the first conveyor belt is located below the guide group, and the first gravity sensor is provided on the first conveyor belt. The second conveying assembly includes a second conveyor belt and a third frame, wherein the second conveyor belt is mounted on the third frame, and the input end of the second conveyor belt is located at the output end of the first conveyor belt. The control component includes a display screen, a control unit, and a fourth frame. The display screen is mounted on the fourth frame, and the control unit is electrically connected to the display screen, a first conveyor belt, a first gravity sensor, a second conveyor belt, a mixing assembly, and a guide assembly, respectively.

2. The fertilizer mixing and quantitative output system according to claim 1, characterized in that, The mixing assembly includes: A mixing pipeline is located below the feed hopper, and the mixing pipeline is connected to the lower part of the feed hopper; A first drive unit is disposed at one end of the mixing pipeline, and the first drive unit is electrically connected to the control unit. The first coupling is connected to the first drive unit for transmission. The stirring rod is connected to the first drive unit via the first coupling, and the stirring rod is coaxial with the mixing pipeline.

3. The fertilizer mixing and quantitative output system according to claim 2, characterized in that, The stirring rod includes: A drive shaft is connected to the first coupling, with one end of the drive shaft close to the input end of the guide assembly; The helical blade extends circumferentially along the drive shaft, and the pitch of the helical blade gradually increases from one end of the drive shaft to the other end of the drive shaft in a predetermined gradient.

4. The fertilizer mixing and quantitative output system according to claim 3, characterized in that, The pitch of the helical blade near the drive shaft is 80 mm, and the pitch of the helical blade near the drive shaft is 120 mm.

5. The fertilizer mixing and quantitative output system according to claim 2, characterized in that, The guide group includes: A guide pipe is disposed at one end of the mixing pipeline, the guide pipe is connected to the mixing pipeline, and the guide pipe is inclined at a certain angle to the first conveying component.

6. The fertilizer mixing and quantitative output system according to claim 5, characterized in that, The guide group also includes: A first valve is disposed on the guide tube and is electrically connected to the control unit.

7. The fertilizer mixing and quantitative output system according to claim 1, characterized in that, The feed hopper has a wide-mouthed funnel structure from top to bottom, and the inner side of the feed hopper is provided with an ultra-high molecular weight polyethylene wear-resistant layer.

8. The fertilizer mixing and quantitative output system according to claim 1, characterized in that, The first frame and / or the second frame and / or the third frame and / or the fourth frame are made of aluminum profiles; The display screen is a configurable touchscreen.

9. The fertilizer mixing and quantitative output system according to claim 1, characterized in that, The first conveying component further includes: The second drive unit is mounted on the second frame; The second coupling is disposed between the second drive unit and the first conveyor belt.

10. The fertilizer mixing and quantitative output system according to claim 1, characterized in that, The second conveying assembly further includes: The third drive unit is disposed on the third frame; The third coupling is disposed between the third drive unit and the second conveyor belt.

Images