A method and device for sampling fertilizer products of a slow-release fertilizer production line

Abstract

This invention relates to the field of fertilizer production technology, and more particularly to a sampling method and apparatus for finished fertilizer products in a slow-release fertilizer production line. The method includes the following steps: real-time calculation of the adaptive allowable error of the line speed and the real-time speed correction factor; calculation and setting of the dynamic sampling trigger weight during the bagging stage; if the real-time weight of the fertilizer in the packaging bag meets the trigger condition, the sampling motor is started to drive sampling according to the single dynamic sampling duration; and when the real-time weight of the fertilizer in the packaging bag meets the falling edge reset condition, the sampling signal is reset, the collected samples are collected in a storage tank for stirring, and the bottom discharge component and dispensing pipe of the storage tank are controlled synchronously. When aligned with the dispensing tank, the discharge component opens to discharge material, and the sample filling of all dispensing tanks is completed in sequence. The sampling rhythm of this invention can be adaptively adjusted with the production line speed, realizing fully automated operation of sampling, mixing, and dispensing without sampling lag, significantly improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of fertilizer production technology, and in particular to a sampling method and apparatus for finished fertilizer products in a slow-release fertilizer production line. Background Technology

[0002] In the production of slow-release fertilizers, the quality testing of finished fertilizer products is the key to controlling product quality. The sampling process directly determines the accuracy and reliability of the test results. Currently, the industry mostly uses manual sampling or mechanical sampling methods.

[0003] Manual sampling mode: The operator holds a sampling cone and inserts it into the finished product packaging bag to take a sample, and then manually repackages the sample.

[0004] This sampling method is cumbersome and inefficient, making it difficult to match the continuous operation rhythm of the production line. It can easily cause sampling delays and affect normal production. In addition, manual operation is greatly affected by the operator's technique, sampling position, and force, resulting in poor sample uniformity and representativeness, which can easily lead to distorted test results and the risk of product misjudgment. At the same time, manual sampling can cause fertilizer spillage, dust pollution on site, and increase the labor intensity of operators.

[0005] Mechanical sampling method: The sampling frequency and number of samplings are generally set according to a fixed time interval. The sampling is based solely on the preset duration and is completely unrelated to the two core operating conditions: production line operating speed and real-time filling weight of fertilizer in packaging bags.

[0006] When the production line is running at high speed, the fertilizer filling speed of the packaging bags is extremely fast. If the fixed sampling rhythm is not responded to in time, there may be problems such as not being able to take samples in time or losing samples (sample loss). When the production line is running at low speed, the fertilizer filling is slow, and the weight signal is prone to small fluctuations. The fixed frequency will cause the sampling command to be repeatedly triggered, resulting in multiple invalid samples (false triggering) and the overall sampling effectiveness is extremely poor. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a sampling method and device for the finished fertilizer product of a slow-release fertilizer production line. The sampling rhythm can be adaptively adjusted with the speed of the production line, realizing the fully automated operation of sampling, mixing and packaging. It is fully adapted to the continuous operation rhythm of the production line, and there will be no sampling lag problem, which significantly improves the operation efficiency.

[0008] This invention is achieved through the following technical solution: A method for sampling the finished fertilizer product from a slow-release fertilizer production line, comprising the following steps: S1: The feed pipe of the slow-release fertilizer production line is equipped with an inclined pipe. The slow-release fertilizer falls into the packaging bag at the bagging mechanism through the inclined pipe. The sampling mechanism is located inside the feed pipe. S2: The weight sensor collects the real-time weight of the fertilizer inside the packaging bag, and the linear velocity sensor collects the real-time linear velocity of the production line. Based on the real-time linear velocity of the production line, the maximum rated linear velocity, and the target total weight of a single bag of fertilizer, the linear velocity adaptive allowable error is calculated in real time. Based on the real-time linear velocity of the production line, the real-time speed correction factor is calculated. Based on the target total weight of a single bag of fertilizer and the speed correction factor, the dynamic sampling trigger weight corresponding to the set bagging stage in each sampling frequency band is calculated in real time. S3: Based on the fertilizer filling sequence of the packaging bag, the dynamic sampling trigger weight corresponding to each filling stage and the linear speed adaptive allowable error, determine in turn whether the real-time weight of the fertilizer in the packaging bag meets the trigger condition. If the trigger condition is met, start the sampling motor to drive the sampling mechanism to take samples. S4: Calculate the single dynamic sampling duration based on the average material flow rate of the linear velocity change, perform multi-point synchronous sampling according to the single dynamic sampling duration, complete the sampling of the corresponding set bagging stage within the sampling frequency band, and reset the sampling signal when the real-time weight of fertilizer in the packaging bag meets the falling edge reset condition, and collect the samples into the storage tank. S5: While sampling, the sampling motor simultaneously controls the stirring mechanism to stir the samples collected in the storage tank at different frequency bands and different bagging stages. S6: Start the dispensing motor and synchronously control the movement of the discharge plate at the bottom of the storage tank and the reciprocating dispensing tube. Combined with the position sensor, the dispensing tube is accurately aligned. When the dispensing tube is aligned with the dispensing tank, the dispensing motor stops running and the solenoid valve opens to discharge the material. When the dispensing tube moves, the solenoid valve closes, and the sample filling of all dispensing tanks is completed in sequence.

[0009] Furthermore, the interval between adjacent sampling frequency bands is updated in real time based on changes in the real-time linear speed of the production line.

[0010] Furthermore, in step S2, the allowable error for adaptive linear speed is calculated according to equation (1), the real-time speed correction factor is calculated according to equation (2), and the dynamic sampling trigger weight is calculated according to equation (3): (1); (2); (3); in: express Adaptive linear velocity tolerance at any given time This indicates the target total weight of a single bag of fertilizer. Represents the benchmark coefficient. express This indicates the real-time line speed of the production line at any given moment. Indicates the maximum rated linear speed of the production line. Indicates time, Indicates the lag coefficient. Indicates the real-time speed correction factor. This represents the speed correction factor. Indicates the threshold for speed segmentation. Indicates the first Dynamic sampling triggers weight at each bagging stage. Indicates the first The ratio of the weight of fertilizer packed in each bagging stage to the target total weight of a single bag of fertilizer. This represents the real-time speed correction factor.

[0011] Furthermore, in step S3, when the real-time weight of the fertilizer inside the packaging bag meets the rising edge trigger condition of equation (4), the sampling motor is started to open the sampling mechanism for sampling: (4); in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express The allowable error for adaptive linear velocity at any given time. Furthermore, in step S4, the duration of a single dynamic sampling is calculated according to equation (5), and the real-time weight of the fertilizer inside the packaging bag satisfies the falling edge reset condition as shown in equation (6): (5); (6); in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express Adaptive linear velocity tolerance at any given time Indicates the duration of a single dynamic sampling. This indicates the target sampling amount for a single bagging stage. This represents the average material flow rate as a function of linear velocity. This indicates the benchmark multiple for fault diagnosis at low speeds. This represents the speed adaptive increment coefficient.

[0012] The optimized step S2 sets the bagging stage, including... Three bagging stages, including: This represents the ratio of the weight of fertilizer packed in the first bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the second bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the third bagging stage to the target total weight of a single bag of fertilizer.

[0013] A sampling device for finished fertilizer product of a slow-release fertilizer production line, used to perform a sampling method for finished fertilizer product of a slow-release fertilizer production line as described in any of the above, characterized in that: it includes a feeding pipe, an inclined pipe, a bagging mechanism, a sampling mechanism, a stirring mechanism, a dispensing mechanism, a speed sensor, a weight sensor, a position sensor and a CPU. The feeding pipe is fixedly installed at the feeding port of the slow-release fertilizer production line. A slanted tube mounting hole is opened in the middle of the feeding pipe, and a feeding pipe sealing plate is fixedly installed at the bottom of the feeding pipe. The feeding pipe sealing plate has multiple sampling mechanism mounting holes. The slanted tube is fixedly installed at the slanted tube mounting hole. The bagging mechanism is located below the slanted tube. The sampling mechanism is installed at the multiple sampling mechanism mounting holes and communicates with the storage tank. The stirring mechanism is located inside the storage tank. The dispensing mechanism is installed below the storage tank. The speed sensor is installed at the conveyor roller of the production line. The weight sensor is installed at the support platform of the bagging mechanism. The position sensor is installed on the dispensing mechanism, and the speed sensor, weight sensor, and position sensor are respectively connected to the CPU.

[0014] Furthermore, the sampling mechanism includes a receiving hopper, a discharge pipe, and a rotating shaft. The receiving hopper includes a central receiving hopper and multiple annular receiving hoppers arranged in a circle around the central receiving hopper. The central receiving hopper has a central receiving hopper top plate, and the multiple annular receiving hoppers have annular receiving hopper top plates. Multiple receiving hopper top plate through holes are respectively opened on the central receiving hopper top plate and the annular receiving hopper top plates. The rotating shaft includes a central rotating shaft and multiple annular rotating shafts. The central rotating shaft is rotatably mounted on the central receiving hopper top plate, and the multiple annular rotating shafts are respectively rotatably mounted on the corresponding annular receiving hopper top plates. A central gear and a central sealing plate are installed. Multiple circumferential rotating shafts are respectively equipped with circumferential gears and circumferential sealing plates, and all circumferential gears mesh with the central gear. The central gear and the multiple circumferential gears each have multiple gear through holes corresponding to the through holes in the top plates of the corresponding receiving hoppers. The central sealing plate and the multiple circumferential sealing plates each have multiple sealing plate through holes corresponding to the through holes in the top plates of the corresponding receiving hoppers. A sampling motor is installed on the discharge pipe. The central rotating shaft and the sampling motor shaft are driven by a bevel gear pair. Multiple discharge pipes are respectively installed at the bottom of the corresponding receiving hoppers.

[0015] Furthermore, the stirring mechanism includes a stirring shaft and stirring blades. The lower part of the stirring shaft extends into the storage tank, the top of the stirring shaft is connected to the central rotating shaft, and the stirring blades are installed at the lower part of the stirring shaft.

[0016] Furthermore, a discharge plate is hinged at the bottom outlet of the storage tank. The dispensing mechanism includes a dispensing support frame, a dispensing motor, a dispensing screw, a slider, a dispensing tube, and multiple dispensing tanks. The dispensing motor is fixedly mounted on the dispensing support frame, and the dispensing screw is rotatably mounted on the dispensing support frame. Both the dispensing screw and the discharge plate are driven to rotate by the dispensing motor. The slider is threadedly mounted on the dispensing screw and slidably connected to the dispensing support frame. One end of the dispensing tube is connected to the outlet of the storage tank, and the other end is connected to the slider. Multiple dispensing tanks are placed in grooves on the dispensing support frame. A solenoid valve is installed at the lower end of the dispensing tube, and the solenoid valve is connected to the CPU.

[0017] Beneficial effects of the invention: The present invention provides a sampling method and apparatus for finished fertilizer products in a slow-release fertilizer production line, which has the following advantages: 1. By integrating the sampling mechanism into the production line's unloading pipe, automatic sampling with synchronous linkage of the production line is achieved. There is no need for manual insertion of the sampling cone tube into each bag, thus realizing automatic sampling. The dispensing mechanism realizes automatic dispensing, completely replacing manual sampling and dispensing operations. This solves the problems of cumbersome, inefficient, and labor-intensive traditional manual operation processes. It is adapted to the continuous production rhythm of the slow-release fertilizer production line, avoids sampling delays affecting the operation of the production line, and solves the problems of low efficiency and unstable test results caused by manual sampling and dispensing in existing technologies.

[0018] 2. The sampling trigger error window is dynamically adjusted based on parameters such as production line speed and real-time fertilizer weight. During high-speed production, the window is widened to prevent sample loss, while during low-speed production, the window is narrowed to avoid invalid false triggers. At the same time, the process is divided into three stages: early, middle, and near-full filling. The sampling node is automatically moved forward or delayed by the speed correction factor. Combined with dynamically calculated sampling duration and frequency, the sampling timing, duration, and frequency are all linked to the production conditions, greatly improving the accuracy and effectiveness of sampling.

[0019] 3. In the dispensing process, the dispensing motor links the feeding plate and the dispensing tube, and the position sensor achieves precise alignment. The material is automatically cut off during the movement of the dispensing tube to prevent material spillage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembly structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the exploded structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the sampling mechanism of the present invention.

[0023] Figure 4 This is a schematic diagram of the stirring mechanism of the present invention.

[0024] Figure 5 This is a schematic diagram of the dispensing mechanism of the present invention.

[0025] In the diagram: 100, Feeding pipe; 101, Feeding pipe sealing plate; 200, Inclined pipe; 300, Storage tank; 400, Dispensing mechanism; 401, Discharge plate; 402, Synchronous belt; 403, Synchronous belt pulley; 404, Dispensing screw; 405, Dispensing pipe; 406, Slider; 407, Dispensing support frame; 408, Dispensing tank; 409, Groove; 410, Dispensing motor; 411, Worm gear; 412, Worm wheel; 413, Solenoid valve; 500, Sampling mechanism; 5 01. Sampling motor; 502. Sampling motor shaft; 503. Bevel gear pair; 504. Central rotating shaft; 505. Gear through hole; 506. Central gear; 507. Circumferential gear; 508. Circumferential receiving hopper; 509. Discharge pipe; 510. Circumferential sealing plate; 511. Central sealing plate; 512. Through hole in the top plate of the receiving hopper; 513. Central receiving hopper; 514. Through hole in the sealing plate; 600. Stirring mechanism; 601. Stirring shaft; 602. Stirring blade. Detailed Implementation

[0026] A method for sampling the finished fertilizer product from a slow-release fertilizer production line, comprising the following steps: S1: The feed pipe of the slow-release fertilizer production line is equipped with an inclined pipe. The slow-release fertilizer falls into the packaging bag at the bagging mechanism through the inclined pipe. The sampling mechanism is located inside the feed pipe. S2: The weight sensor collects the real-time weight of the fertilizer inside the packaging bag, and the linear velocity sensor collects the real-time linear velocity of the production line. Based on the real-time linear velocity of the production line, the maximum rated linear velocity, and the target total weight of a single bag of fertilizer, the linear velocity adaptive allowable error is calculated in real time. Based on the real-time linear velocity of the production line, the real-time speed correction factor is calculated. Based on the target total weight of a single bag of fertilizer and the speed correction factor, the dynamic sampling trigger weight corresponding to the set bagging stage in each sampling frequency band is calculated in real time. Specifically, the allowable error for adaptive linear speed can be calculated according to equation (1), the real-time speed correction factor can be calculated according to equation (2), and the dynamic sampling trigger weight can be calculated according to equation (3). (1); (2); (3); in: express Adaptive linear velocity tolerance at any given time This indicates the target total weight of a single bag of fertilizer. Represents the benchmark coefficient. express This indicates the real-time line speed of the production line at any given moment. Indicates the maximum rated linear speed of the production line. Indicates time, Indicates the lag coefficient. Indicates the real-time speed correction factor. This represents the speed correction factor. Indicates the threshold for speed segmentation. Indicates the first Dynamic sampling triggers weight at each bagging stage. Indicates the first The ratio of the weight of fertilizer packed in each bagging stage to the target total weight of a single bag of fertilizer. This represents the real-time speed correction factor.

[0027] Optimized, the bagging stage can be set to include Three bagging stages, including: This represents the ratio of the weight of fertilizer packed in the first bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the second bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the third bagging stage to the target total weight of a single bag of fertilizer.

[0028] S3: Based on the fertilizer filling sequence of the packaging bag, the dynamic sampling trigger weight corresponding to each filling stage and the linear speed adaptive allowable error, determine in turn whether the real-time weight of the fertilizer in the packaging bag meets the trigger condition. If the trigger condition is met, start the sampling motor to drive the sampling mechanism to take samples. Specifically, when the real-time weight of the fertilizer inside the packaging bag meets the rising edge trigger condition of equation (4), the sampling motor is started to open the sampling mechanism for sampling: (4); in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express The allowable error for adaptive linear velocity at any given time.

[0029] S4: Calculate the single dynamic sampling duration based on the average material flow rate of the linear velocity change, perform multi-point synchronous sampling according to the single dynamic sampling duration, complete the sampling of the corresponding set bagging stage within the sampling frequency band, and reset the sampling signal when the real-time weight of fertilizer in the packaging bag meets the falling edge reset condition, and collect the samples into the storage tank. Specifically, the duration of a single dynamic sampling can be calculated according to equation (5), and the real-time weight of the fertilizer in the packaging bag satisfies the falling edge reset condition as shown in equation (6): (5); (6); in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express Adaptive linear velocity tolerance at any given time Indicates the duration of a single dynamic sampling. This indicates the target sampling amount for a single bagging stage. This represents the average material flow rate as a function of linear velocity. This indicates the benchmark multiple for fault diagnosis at low speeds. This represents the speed adaptive increment coefficient.

[0030] The allowable error of adaptive line speed is calculated according to formula (1). When the production line speed increases, the allowable error of adaptive line speed increases and the sampling trigger window widens; when the production line speed decreases, the allowable error of adaptive line speed decreases and the sampling trigger window narrows.

[0031] Based on Equation (2), the speed correction factor is calculated, and based on Equation (3), the dynamic sampling trigger weight is calculated. According to Equation (5), the duration of a single dynamic sampling is calculated. The sampling trigger error window can be dynamically adjusted. During high-speed production, the window is widened to prevent sample loss, and during low-speed production, the window is narrowed to avoid invalid false triggers. At the same time, multiple stages such as early filling, middle filling, and near-full bag filling can be divided. By automatically moving forward or delaying the sampling node through the speed correction factor, and with the dynamically calculated sampling duration and sampling frequency, the sampling timing, duration, and frequency can all change in conjunction with the production conditions, and the sampling accuracy and effectiveness are greatly improved.

[0032] S5: While sampling, the sampling motor simultaneously controls the stirring mechanism to stir the samples collected in the storage tank at different frequency bands and different bagging stages. While sampling, the sampling motor simultaneously controls the stirring mechanism to stir the sample in the storage tank, which can ensure the uniformity of the stirring of samples collected at different frequency bands and different bagging stages, and prevent the problem of unstable test results due to sampling differences.

[0033] S6: Start the dispensing motor and synchronously control the movement of the discharge plate at the bottom of the storage tank and the reciprocating dispensing tube. Combined with the position sensor, the dispensing tube is accurately aligned. When the dispensing tube is aligned with the dispensing tank, the dispensing motor stops running and the solenoid valve opens to discharge the material. When the dispensing tube moves, the solenoid valve closes, and the sample filling of all dispensing tanks is completed in sequence.

[0034] By controlling the rotation speed of the dispensing motor, the opening and closing rhythm of the discharge plate and the moving speed of the dispensing tube can be controlled to adapt to the real-time linear speed of the production line and keep in sync with the sampling rhythm.

[0035] Furthermore, the interval between adjacent sampling frequency bands is updated in real time based on changes in the production line's real-time linear speed. This allows for a higher sampling frequency when the production line is operating at high speed and a lower sampling frequency when the production line is operating at low speed.

[0036] A sampling device for finished fertilizer product in a slow-release fertilizer production line, the structural diagram of which is shown below. Figure 1 , Figure 2 As shown, a sampling method for a slow-release fertilizer production line product as described in any of the above is characterized by comprising: a feeding pipe 100, an inclined pipe 200, a bagging mechanism (not shown), a sampling mechanism 500, a stirring mechanism 600, a dispensing mechanism 400, a speed sensor, a weight sensor, a position sensor, and a CPU. The feeding pipe is fixedly installed at the feeding port of the slow-release fertilizer production line. A slanted tube mounting hole is opened in the middle of the feeding pipe. A feeding pipe sealing plate 101 is fixedly installed at the bottom of the feeding pipe. The feeding pipe sealing plate has multiple sampling mechanism mounting holes. The slanted tube is fixedly installed at the slanted tube mounting hole. The bagging mechanism is located below the slanted tube. The sampling mechanism is installed at the multiple sampling mechanism mounting holes and is connected to the storage tank 300. The stirring mechanism is located inside the storage tank. The dispensing mechanism is installed below the storage tank. The speed sensor is installed at the conveyor roller of the production line. The weight sensor is installed at the support platform of the bagging mechanism. The position sensor is installed on the dispensing mechanism. The speed sensor, weight sensor and position sensor are respectively connected to the CPU.

[0037] By integrating the sampling mechanism into the production line's feed pipe, automated sampling is achieved synchronously across the entire production line, eliminating the need for manual insertion of the sampling cone into each bag. The packaging mechanism enables automated packaging, completely replacing manual sampling and packaging operations. This solves the problems of cumbersome processes, low efficiency, and high manpower requirements associated with traditional manual operations. It adapts to the continuous production rhythm of slow-release fertilizer production lines, avoiding sampling delays that could affect production line operation. It also addresses the issues of low efficiency and unstable test results caused by manual sampling and packaging in existing technologies.

[0038] Furthermore, because the speed sensor is installed on the conveyor rollers of the production line, the weight sensor is installed on the support platform of the bagging mechanism, and the position sensor is installed on the dispensing mechanism, and these sensors are all connected to the CPU, the CPU can perform corresponding calculations based on the information from the speed, weight, and position sensors, thereby controlling the automatic operation of the sampling and dispensing mechanisms. This allows for dynamic adjustment of the sampling trigger error window based on parameters such as the production line speed and the real-time weight of the fertilizer. During high-speed production, the window is widened to prevent sample loss, while during low-speed production, the window is narrowed to avoid invalid false triggers. Simultaneously, the system divides the process into three stages: early, middle, and near-full filling. By automatically advancing or delaying the sampling node through a speed correction factor, coupled with dynamically calculated sampling duration and frequency, the timing, duration, and frequency of sampling change in tandem with the production conditions, significantly improving sampling accuracy and effectiveness.

[0039] Furthermore, the schematic diagram of the sampling mechanism is as follows: Figure 3 As shown, the system includes a receiving hopper, a discharge pipe 509, and a rotating shaft. The receiving hopper includes a central receiving hopper 513 and multiple annular receiving hoppers 508 arranged in a circle around the central receiving hopper. The central receiving hopper has a central receiving hopper top plate, and the multiple annular receiving hoppers have annular receiving hopper top plates. Multiple receiving hopper top plate through holes 512 are respectively opened on the central receiving hopper top plate and the annular receiving hopper top plates. The rotating shaft includes a central rotating shaft 504 and multiple annular rotating shafts (not shown). The central rotating shaft is rotatably mounted on the central receiving hopper top plate, and the multiple annular rotating shafts are respectively rotatably mounted on their respective annular receiving hopper top plates. A central gear is mounted on the central rotating shaft. 506 and a central sealing plate 511, and a plurality of circumferential rotating shafts are respectively equipped with circumferential gears 507 and circumferential sealing plates 510, and the plurality of circumferential gears mesh with the central gear. The central gear and the plurality of circumferential gears are respectively provided with a plurality of gear through holes 505 corresponding to the through holes of the corresponding receiving hopper top plate. The central sealing plate and the plurality of circumferential sealing plates are respectively provided with a plurality of sealing plate through holes 514 corresponding to the through holes of the corresponding receiving hopper top plate. A sampling motor 501 is installed on the discharge pipe. The central rotating shaft and the sampling motor rotating shaft 502 are driven by a bevel gear pair 503. The discharge pipes are a plurality of pipes respectively installed at the bottom of the corresponding receiving hopper.

[0040] The sampling motor shaft rotates horizontally, and through the transmission of the bevel gear pair, the horizontal motion is converted into vertical motion, driving the central rotating shaft to rotate vertically. This causes the central gear and central sealing plate to rotate together, which in turn drives multiple circumferential gears and circumferential sealing plates to rotate. As a result, the through holes on the circumferential gears, circumferential sealing plates, central gear, and central sealing plates are aligned with the through holes on the top plates of the corresponding receiving hoppers. The material is in a conductive state, and then the material falls into the corresponding receiving hopper along the through holes for automatic sampling. Since there are multiple discharge pipes installed at the bottom of the corresponding receiving hoppers, the sample will fall into the storage tank along the discharge pipes.

[0041] Because the receiving hopper includes a central receiving hopper and multiple peripheral receiving hoppers arranged in a circle around the central receiving hopper, multi-point synchronous sampling can be performed, which improves the sampling speed and further ensures the uniformity of the sampling. At the same time, since multi-point sampling is controlled by the same sampling motor, the synchronization of multi-point sampling is guaranteed, and the sampling cost is reduced.

[0042] Furthermore, the schematic diagram of the stirring mechanism is shown below. Figure 4 As shown, it includes a stirring shaft 601 and stirring blades 602. The lower part of the stirring shaft extends into the storage tank, the top of the stirring shaft is connected to the central rotating shaft, and the stirring blades are installed at the lower part of the stirring shaft.

[0043] The stirring shaft and the central rotating shaft can also be made as one piece.

[0044] Because the top of the stirring shaft is connected to the central rotating shaft, the stirring mechanism and the sampling mechanism share the same motor, which enables the stirring of the sample to be completed at the same time as sampling. This not only improves the sampling speed but also further reduces the sampling cost.

[0045] Furthermore, a discharge plate 401 is hinged at the bottom outlet of the storage tank, and the schematic diagram of the dispensing mechanism is shown below. Figure 5 As shown, the device includes a dispensing support frame 407, a dispensing motor 410, a dispensing screw 404, a slider 406, a dispensing tube 405, and multiple dispensing tanks 408. The dispensing motor is fixedly mounted on the dispensing support frame, and the dispensing screw is rotatably mounted on the dispensing support frame. Both the dispensing screw and the discharge plate are driven to rotate by the dispensing motor. The slider is threadedly mounted on the dispensing screw and slidably connected to the dispensing support frame. One end of the dispensing tube is connected to the outlet of the storage tank, and the other end is connected to the slider. Multiple dispensing tanks are placed in grooves 409 on the dispensing support frame. A solenoid valve 413 is installed at the lower end of the dispensing tube, and the solenoid valve is connected to the CPU.

[0046] Specifically, the discharge plate can be driven to rotate by a worm gear mechanism. Synchronous pulleys 403 are installed on the worm 411 and the dispensing screw, and a synchronous belt 402 is installed between the two pulleys. While the dispensing motor drives the dispensing screw to rotate, the worm rotates synchronously, which in turn drives the discharge plate to open via the worm gear 412. The rotation of the dispensing screw causes the slider to reciprocate along the screw, thereby driving the dispensing tube to move linearly. A position sensor detects when the dispensing tube reaches directly above the corresponding dispensing tank, at which point the dispensing motor stops, and the CPU controls the solenoid valve at the lower end of the dispensing tube to open, initiating dispensing. After one dispensing tank is full, the solenoid valve closes, the dispensing motor starts, and the dispensing tube moves to the next dispensing tank for further dispensing, until all dispensing tanks are filled. Then, the dispensing motor drives the dispensing tube and discharge plate to reset, awaiting the next round of dispensing. Because the discharge plate and dispensing tube are driven by the same dispensing motor, sampling costs are further reduced. Furthermore, by setting up a solenoid valve, the dispensing tube automatically stops material during movement, preventing spillage.

[0047] In summary, the present invention provides a sampling method and apparatus for finished fertilizer products in a slow-release fertilizer production line. The sampling rhythm can be adaptively adjusted according to the production line speed, realizing fully automated operation of sampling, mixing and packaging. It is fully adapted to the continuous operation rhythm of the production line, and there will be no sampling lag problem, which significantly improves the operation efficiency and reduces the sampling cost.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for sampling finished fertilizer products from a slow-release fertilizer production line, characterized in that: Includes the following steps: S1: The feed pipe of the slow-release fertilizer production line is equipped with an inclined pipe. The slow-release fertilizer falls into the packaging bag at the bagging mechanism through the inclined pipe. The sampling mechanism is located inside the feed pipe. S2: The weight sensor collects the real-time weight of the fertilizer inside the packaging bag, and the linear velocity sensor collects the real-time linear velocity of the production line. Based on the real-time linear velocity of the production line, the maximum rated linear velocity, and the target total weight of a single bag of fertilizer, the linear velocity adaptive allowable error is calculated in real time. Based on the real-time linear velocity of the production line, the real-time speed correction factor is calculated. Based on the target total weight of a single bag of fertilizer and the speed correction factor, the dynamic sampling trigger weight corresponding to the set bagging stage in each sampling frequency band is calculated in real time. S3: Based on the fertilizer filling sequence of the packaging bag, the dynamic sampling trigger weight corresponding to each filling stage and the linear speed adaptive allowable error, determine in turn whether the real-time weight of the fertilizer in the packaging bag meets the trigger condition. If the trigger condition is met, start the sampling motor to drive the sampling mechanism to take samples. S4: Calculate the single dynamic sampling duration based on the average material flow rate of the linear velocity change, perform multi-point synchronous sampling according to the single dynamic sampling duration, complete the sampling of the corresponding set bagging stage within the sampling frequency band, and reset the sampling signal when the real-time weight of fertilizer in the packaging bag meets the falling edge reset condition, and collect the samples into the storage tank. S5: While sampling, the sampling motor simultaneously controls the stirring mechanism to stir the samples collected in the storage tank at different frequency bands and different bagging stages. S6: Start the dispensing motor and synchronously control the movement of the discharge plate at the bottom of the storage tank and the reciprocating dispensing tube. Combined with the position sensor, the dispensing tube is accurately aligned. When the dispensing tube is aligned with the dispensing tank, the dispensing motor stops running and the solenoid valve opens to discharge the material. When the dispensing tube moves, the solenoid valve closes, and the sample filling of all dispensing tanks is completed in sequence.

2. The sampling method for finished fertilizer product from a slow-release fertilizer production line according to claim 1, characterized in that: The interval between adjacent sampling frequency bands is updated in real time based on changes in the real-time line speed of the production line.

3. The sampling method for finished fertilizer product from a slow-release fertilizer production line according to claim 1, characterized in that: In step S2, the allowable error for adaptive linear speed is calculated according to equation (1), the real-time speed correction factor is calculated according to equation (2), and the dynamic sampling trigger weight is calculated according to equation (3). （1）； （2）； （3）； in: express Adaptive linear velocity tolerance at any given time This indicates the target total weight of a single bag of fertilizer. Represents the benchmark coefficient. express This indicates the real-time line speed of the production line at any given moment. Indicates the maximum rated linear speed of the production line. Indicates time, Indicates the lag coefficient. Indicates the real-time speed correction factor. This represents the speed correction factor. Indicates the threshold for speed segmentation. Indicates the first Dynamic sampling triggers weight at each bagging stage. Indicates the first The ratio of the weight of fertilizer packed in each bagging stage to the target total weight of a single bag of fertilizer. This represents the real-time speed correction factor.

4. The sampling method for finished fertilizer product from a slow-release fertilizer production line according to claim 1, characterized in that: In step S3, when the real-time weight of the fertilizer inside the packaging bag meets the rising edge trigger condition of equation (4), the sampling motor is started to open the sampling mechanism for sampling: (4)； in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express The allowable error for adaptive linear velocity at any given time.

5. The sampling method for finished fertilizer product from a slow-release fertilizer production line according to claim 1, characterized in that: In step S4, the duration of a single dynamic sampling is calculated according to equation (5), and the real-time weight of the fertilizer in the packaging bag satisfies the falling edge reset condition as shown in equation (6): （5）； （6）； in: This indicates the real-time weight of the fertilizer inside the packaging bag. Indicates the first Dynamic sampling triggers weight at each bagging stage. express Adaptive linear velocity tolerance at any given time Indicates the duration of a single dynamic sampling. This indicates the target sampling amount for a single bagging stage. This represents the average material flow rate as a function of linear velocity. This indicates the benchmark multiple for fault diagnosis at low speeds. This represents the speed adaptive increment coefficient.

6. The sampling method for finished fertilizer product from a slow-release fertilizer production line according to claim 1, characterized in that: Step S2 sets the bagging stage, including Three bagging stages, including: This represents the ratio of the weight of fertilizer packed in the first bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the second bagging stage to the target total weight of a single bag of fertilizer. This represents the ratio of the weight of fertilizer packed in the third bagging stage to the target total weight of a single bag of fertilizer.

7. A sampling device for finished fertilizer product from a slow-release fertilizer production line, used to perform a sampling method for finished fertilizer product from a slow-release fertilizer production line as described in any one of claims 1 to 6, characterized in that: It includes a feeding pipe, an inclined pipe, a bagging mechanism, a sampling mechanism, a mixing mechanism, a dispensing mechanism, a speed sensor, a weight sensor, a position sensor, and a CPU; The feeding pipe is fixedly installed at the feeding port of the slow-release fertilizer production line. A slanted tube mounting hole is opened in the middle of the feeding pipe, and a feeding pipe sealing plate is fixedly installed at the bottom of the feeding pipe. The feeding pipe sealing plate has multiple sampling mechanism mounting holes. The slanted tube is fixedly installed at the slanted tube mounting hole. The bagging mechanism is located below the slanted tube. The sampling mechanism is installed at the multiple sampling mechanism mounting holes and communicates with the storage tank. The stirring mechanism is located inside the storage tank. The dispensing mechanism is installed below the storage tank. The speed sensor is installed at the conveyor roller of the production line. The weight sensor is installed at the support platform of the bagging mechanism. The position sensor is installed on the dispensing mechanism, and the speed sensor, weight sensor, and position sensor are respectively connected to the CPU.

8. A sampling device for finished fertilizer product in a slow-release fertilizer production line according to claim 7, characterized in that: The sampling mechanism includes a receiving hopper, a discharge pipe, and a rotating shaft. The receiving hopper includes a central receiving hopper and multiple annular receiving hoppers arranged in a circle around the central receiving hopper. The central receiving hopper has a central receiving hopper top plate, and the multiple annular receiving hoppers have annular receiving hopper top plates. Multiple through holes are respectively opened on the central receiving hopper top plate and the annular receiving hopper top plates. The rotating shaft includes a central rotating shaft and multiple annular rotating shafts. The central rotating shaft is rotatably mounted on the central receiving hopper top plate, and the multiple annular rotating shafts are respectively rotatably mounted on the corresponding annular receiving hopper top plates. The central rotating shaft is mounted on... The device includes a central gear and a central sealing plate. Multiple circumferential rotating shafts are respectively equipped with circumferential gears and circumferential sealing plates, and all circumferential gears mesh with the central gear. The central gear and the multiple circumferential gears each have multiple gear through holes corresponding to the through holes in the top plate of the corresponding receiving hopper. The central sealing plate and the multiple circumferential sealing plates each have multiple sealing plate through holes corresponding to the through holes in the top plate of the corresponding receiving hopper. A sampling motor is installed on the discharge pipe. The central rotating shaft and the sampling motor shaft are driven by a bevel gear pair. Multiple discharge pipes are respectively installed at the bottom of the corresponding receiving hoppers.

9. A sampling device for finished fertilizer product in a slow-release fertilizer production line according to claim 8, characterized in that: The stirring mechanism includes a stirring shaft and stirring blades. The lower part of the stirring shaft extends into the storage tank, the top of the stirring shaft is connected to the central rotating shaft, and the stirring blades are installed at the lower part of the stirring shaft.

10. A sampling device for finished fertilizer product in a slow-release fertilizer production line according to claim 7, characterized in that: A discharge plate is hinged at the bottom outlet of the storage tank. The dispensing mechanism includes a dispensing support frame, a dispensing motor, a dispensing screw, a slider, a dispensing tube, and multiple dispensing tanks. The dispensing motor is fixedly mounted on the dispensing support frame, and the dispensing screw is rotatably mounted on the dispensing support frame. Both the dispensing screw and the discharge plate are driven to rotate by the dispensing motor. The slider is threadedly mounted on the dispensing screw and slidably connected to the dispensing support frame. One end of the dispensing tube is connected to the outlet of the storage tank, and the other end is connected to the slider. Multiple dispensing tanks are placed in grooves on the dispensing support frame. A solenoid valve is installed at the lower end of the dispensing tube, and the solenoid valve is connected to the CPU.

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