Granulation device stoppage control method

Abstract

The application belongs to the technical field of grain feed processing equipment. The granulating device shutdown control method is that a temperature sensor is arranged at the discharge port of the feeder, and the control method is that: when normally producing, the temperature at the outlet of the feeder is T1-T2; the current of the granulator host is I1-I2; when the temperature sensor monitors that the outlet temperature of the feeder abnormally rises rapidly, it is determined that there is no material in the material preparation bin and the feeder, the feeder is closed, and the steam control valve on the steam assembly of the conditioner is closed; the current data of the granulator host is monitored in real time; when it is monitored that the current of the granulator host drops to the no-load current and is maintained for 5-10s, it is determined that the granulator host is in the no-load state, and the material in the conditioner is discharged; the conditioner is closed layer by layer from top to bottom, and then the granulator host is closed, and the shutdown is completed. The application is used to solve the technical problem that the existing granulating section automatic shutdown system cannot realize precise shutdown.

Description

Technical Field

[0001] This invention belongs to the technical field of grain and feed processing equipment, specifically relating to a method for controlling the shutdown of a pelleting device. Background Technology

[0002] The feed pelleting section generally consists of several parts, including a pelleting hopper, a feeder, a conditioner, a conditioner, the pellet mill itself, a steam addition system, and a gear lubrication system. The pulverized powdered material is temporarily stored in the pelleting hopper, then enters the feeder, which provides the forward flow power to the conditioner. Inside the conditioner, the material is mixed with steam for heating and maturation, and then enters the pellet mill for extrusion and pelleting.

[0003] Currently, automatic shutdown of pelleting sections in the feed industry relies on a material level signal at the bottom of the pelleting hopper to indicate that material is depleted. A set delay time is then used to determine when the feeder is empty, at which point the feeder and steam are shut off. Another delay is then used to shut down the conditioner, and so on. Essentially, the system triggers a material shortage signal by the pelleting hopper's lower level, and the system stops the feeder and conditioner after a set delay. This system has two problems: First, the level sensor signal is prone to malfunction, failing to provide accurate material level signals, leading to steam entering the pelleting hopper and causing material buildup. Second, the delayed shutdown is related to the current pellet mill capacity, and the delay time is difficult to accurately determine when the feeder or conditioner has been emptied, resulting in material waste.

[0004] As market competition intensifies in the feed processing industry, the demands for lower processing costs are increasing. On one hand, there is a need to reduce manpower requirements and achieve full automation; however, existing technologies cannot provide reliable automatic shutdown control systems. Frequent false alarms from the feed level sensors in the pelleting hopper lead to abnormal shutdowns, resulting in poor market application. Most systems still rely on manual shutdown, requiring real-time operator checks, which fails to reduce labor costs.

[0005] Furthermore, existing technology involves setting a shutdown delay: after a material level alarm, a delay is set before shutting down the feeder and steam, followed by another delay before shutting down the conditioner and main unit. This delay time parameter is related to the pellet mill's capacity; a larger capacity requires a shorter delay, and a smaller capacity requires a longer delay. Therefore, this parameter is difficult to set accurately. If the delay time is set shorter than the actual required time, material inside the feeder or conditioner may not be completely emptied, resulting in raw material waste. If the delay time is set longer than the actual required time, steam may enter the pelleting hopper, forming condensate, which in turn affects the material level sensor signal in the pelleting hopper, creating a vicious cycle. Summary of the Invention

[0006] The purpose of this invention is to provide a shutdown control method for a granulation device, which solves the technical problem that existing automatic shutdown systems for granulation sections cannot achieve precise shutdown.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a granulation device shutdown control method, characterized in that the granulation device includes a granulation bin, a feeder, a conditioner, a conditioner, and a granulator main unit; a temperature sensor is installed at the outlet of the feeder to acquire the temperature data of the feeder outlet; a steam assembly is installed on the conditioner, and a steam control valve is installed on the steam assembly. The control method is as follows: During normal production, the temperature at the feeder outlet is T1-T2; the current of the pellet mill main unit is I1-I2. When the temperature sensor detects an abnormally rapid rise in the outlet temperature of the feeder, it is determined that there is no material in the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed. Real-time monitoring of the current data of the granulator main unit; When the current of the main unit of the granulator drops to the no-load current and remains there for 5-10 seconds, it is determined that the main unit of the granulator is in a no-load state and the material in the conditioner is discharged. The conditioner is then turned off layer by layer from top to bottom, and then the main unit of the granulator is turned off to complete the shutdown.

[0008] This invention utilizes the temperature change characteristics at the feeder outlet to determine if there is no material in the pelleting hopper. If the temperature rises rapidly and abnormally, it is determined that there is no material in the pelleting hopper and the feeder, and the feeder and steam valve are quickly shut off.

[0009] This invention determines whether the granulator is in an unloaded state by capturing the current of the granulator main unit. If the granulator is in an unloaded state, it means that the material inside the conditioner has been discharged, and then the conditioner, granulator main unit and other equipment are stopped.

[0010] This invention can fully automate the granulation process and ensure the stability of the shutdown signal, resolving the issue of residue inside the feeder and conditioner. Simultaneously, it effectively avoids the risk of steam entering the granulation bin, making it more reliable and enabling fully automated control of the granulation process.

[0011] To address the technical problem of how to use a temperature sensor to detect an abnormally rapid rise in the outlet temperature of the feeder, the present invention adopts the following technical solution: when the temperature sensor detects that the outlet temperature of the feeder has risen to T3-T4, where T3=1.2T1 and T4=1.2T2, it is determined that there is no material in the granulation bin and inside the feeder, and the feeder is shut off, and the steam control valve of the conditioner is closed.

[0012] To address the technical challenge of detecting an abnormally rapid rise in the feeder outlet temperature using a temperature sensor, the time interval for temperature detection by the temperature sensor is set to t, and adjacent time intervals t1-t are continuously recorded. n Calculate the average temperature difference. When at a certain time point t i If the temperature difference exceeds twice the average value, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed.

[0013] At the same time, all steam valves in the conditioner are closed. In fact, the steam is turned off as soon as the material in the feeder is emptied. At this time, there is still some tail material running in the conditioner. If the steam is completely turned off at this time, the tail material may not be fully conditioned.

[0014] To solve the above technical problems, the present invention adopts the following technical solution: a plurality of steam components are arranged sequentially along the length of the conditioner, and a steam control valve is respectively arranged on each steam component; When the temperature sensor detects an abnormally rapid rise in the feeder outlet temperature, it is determined that there is no material in the granulation bin and inside the feeder. The feeder is then shut off, and the steam valve of the steam assembly closest to the feeder outlet is immediately closed. A delay time t is then set. 延时 From the inlet to the outlet of the conditioner, the steam control valves of the corresponding steam components are closed in sequence. Steam will not enter the feeder, but the tail material can continue to be heated.

[0015] To further address the technical problem of improving control accuracy, the present invention adopts the following technical solution: a material level sensor is installed on the granulation bin. When the material does not reach the level sensor, the temperature sensor detects it at the first time interval t. When the material reaches the level sensor, it means that the hopper is about to be emptied. A small amount of material is being conveyed in the feeder. The temperature sensor increases the detection frequency and performs detection at a second time interval t', which is less than the first time interval t. If the level sensor does not detect the material level reaching the bottom and the temperature sensor still shows an abnormal temperature rise, then the level sensor is faulty, or there is bridging in the silo, requiring a shutdown to achieve more precise control.

[0016] To solve the technical problem of how to implement the granulation device, the present invention adopts the following technical solution, wherein the granulation bin, feeder, conditioner, conditioner, and granulator are arranged in order from top to bottom.

[0017] To solve the technical problem of how to implement the granulation device, the present invention adopts the following technical solution: the conditioner includes at least two conditioners, the conditioner is arranged between the feeder and the conditioner, and the conditioner is arranged between the feeder and the granulator.

[0018] To address the technical problem of feeder outlet temperature during normal production, the present invention adopts the following technical solution: during normal production, the feeder outlet temperature T1-T2 is slightly higher than room temperature.

[0019] To address the technical problem of feeder outlet temperature during normal production, this invention adopts the following technical solution: during normal production, the feeder outlet temperature is 35-45℃. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the granulation device of the present invention; Figure 2 This is a flowchart of the granulation device shutdown control method of the present invention; In the picture: 10. Granulation device; 100 Pelletizing bin; 110 Material level gauge; 200 Feeder; 300 Conditioner; 400 Preservative; 500 Pelletizer main unit; 600 Temperature sensor. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Example 1 like Figure 1 As shown, the granulation device 10 includes a granulation bin 100, a feeder 200, a conditioner 300, a conditioner 400, and a granulator main unit 500. A discharge level gauge 110 is installed on the granulation bin 100.

[0023] In one embodiment, the pelleting bin 100, feeder 200, conditioner 300, conditioner 400, and pellet mill main unit 500 are arranged in order from top to bottom.

[0024] In one embodiment, the number of conditioners 300 includes at least two. The outlet of the pelleting bin 100 is connected to the inlet of the feeder 200. A conditioner 300 is disposed between the feeder 200 and the retainer 400, and a conditioner 300 is installed between the retainer 400 and the pellet mill main unit 500.

[0025] A steam assembly is installed on the conditioner 300, and a steam control valve is installed on the steam assembly.

[0026] A temperature sensor 600 is installed at the discharge port of the feeder 200 to acquire temperature data at the discharge port of the feeder.

[0027] The principle of determining the material in the granulation bin by utilizing the temperature change characteristics at the feeder outlet: The material flow path in the pelleting unit is as follows: pelleting bin — feeder — conditioner (multi-layer) — pellet mill. Steam is added in the top conditioner. The temperature sensor is installed at the outlet of the feeder, which is the inlet of the top conditioner.

[0028] During normal production, the material enters the top conditioning unit from the feeder outlet. Because material passes through this channel, the steam added in the top conditioning unit will not enter the feeder. The temperature there is slightly higher than room temperature and remains stable or fluctuates slowly.

[0029] When all material in the pelleting hopper and the feeder has been processed, no more material will enter the top conditioner through this channel. Steam from the conditioner will then rapidly enter this channel, causing a rapid and abnormal temperature rise. By observing this reading from the temperature sensor, it can be determined that there is no material left in the pelleting hopper and feeder, and the feeder and steam valves should be shut off immediately.

[0030] When there is no material inside the granulation hopper and feeder, the temperature changes need to be compared and identified based on the actual application and the temperature changes during normal production.

[0031] Automatic shutdown control principle of the granulation section: When the temperature at the feeder outlet rises abnormally, and there is no material left in the feeder and granulation bin, the steam valve and feeder should be shut off immediately.

[0032] During normal production, the current of the pellet mill is related to the amount of material entering the pelleting chamber. The more material entering the pelleting chamber, the higher the current, and vice versa. When the material in the conditioner is completely drained, meaning no more material enters the pelleting chamber, the current of the pellet mill will drop and stabilize at a lower level. At this point, the conditioners can be stopped layer by layer. After all the conditioners have stopped, the pellet mill can be stopped, completing the entire shutdown process.

[0033] like Figure 2 As shown, the shutdown control method for the granulation unit. During normal production, the temperature at the feeder outlet is T1-T2; the current of the pellet mill main unit is I1-I2. When the temperature sensor detects an abnormally rapid rise in the outlet temperature of the feeder, it is determined that there is no material in the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed. Real-time monitoring of the current data of the granulator main unit; When the current of the main unit of the granulator drops to the no-load current and remains there for 5-10 seconds, it is determined that the main unit of the granulator is in a no-load state and the material in the conditioner is discharged. The conditioner is then turned off layer by layer from top to bottom, and then the main unit of the granulator is turned off to complete the shutdown.

[0034] During normal production, the feeder outlet temperature T1-T2 is slightly higher than room temperature, preferably 35-45℃.

[0035] This invention determines whether the granulator is in an unloaded state by capturing the current of the granulator main unit. If the granulator is in an unloaded state, it means that the material inside the conditioner has been discharged, and then the conditioner, granulator main unit and other equipment are stopped.

[0036] This invention can fully automate the granulation process and ensure the stability of the shutdown signal, resolving the issue of residue inside the feeder and conditioner. Simultaneously, it effectively avoids the risk of steam entering the granulation bin, making it more reliable and enabling fully automated control of the granulation process.

[0037] Example 2 When the temperature sensor detects that the outlet temperature of the feeder rises to T3-T4, where T3=1.2T1 and T4=1.2T2, it is determined that there is no material in the granulation bin and the feeder. The feeder is then shut off, and the steam control valve of the conditioner is closed.

[0038] Specifically, in the granulation and conditioning section, the conditioning chamber temperature is generally required to be between 65-80℃, depending on the different materials and process requirements. The temperature at the feeder outlet is heated to some extent because it is connected to the conditioning unit, but due to the continuous flow of material, it will not reach the temperature inside the conditioning unit. For example, under certain processing conditions, the temperature at the feeder outlet may fluctuate slowly around 40℃, potentially rising slowly from 35℃ to 45℃ over a period of time, or slowly decreasing from 45℃ to 38℃, or fluctuating slowly around 42℃. However, as long as there is material flowing, there will be no rapid rise in material temperature within a short period.

[0039] In one embodiment, the temperature measured by the temperature sensor is recorded at regular time intervals, and the average temperature is calculated. When the temperature change reaches 20%, it is determined to be an abnormal temperature change, and the steam is shut off. For example, if the average temperature of a batch of materials measured during normal production is 40℃, then 48℃ is set as the threshold temperature. When the temperature detected within the interval becomes 48℃, it is considered that the temperature is abnormal and the steam is shut off.

[0040] Example 3 The time interval for temperature detection by the temperature sensor is set to t, and adjacent time intervals t1-t are continuously recorded. nCalculate the average temperature difference. When at a certain time point t i If the temperature difference exceeds twice the average value, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed.

[0041] Specifically, in this embodiment, the judgment is based on the temperature change between adjacent time intervals. The time interval for temperature sensor to detect temperature is set to 5 seconds, and the temperature difference between adjacent time intervals is continuously recorded, along with the average value of the temperature difference. When the temperature difference at a certain time point exceeds twice the average value, the steam valve is immediately closed.

[0042] Example 4 At the same time, all steam valves in the conditioner are closed. In fact, the steam is turned off as soon as the material in the feeder is emptied. At this time, there is still some tail material running in the conditioner. If the steam is completely turned off at this time, there may be a situation where the tail material cannot be fully conditioned.

[0043] In this embodiment, a plurality of steam components are sequentially arranged along the length of the conditioner, and each steam component is provided with a steam control valve. When the temperature sensor detects an abnormally rapid rise in the feeder outlet temperature, it is determined that there is no material in the granulation bin and inside the feeder. The feeder is then shut off, and the steam valve of the steam assembly closest to the feeder outlet is immediately closed. A delay time t is then set. 延时 From the inlet to the outlet of the conditioner, the steam control valves of the corresponding steam components are closed sequentially.

[0044] Specifically, the steam pipeline arranged along the length of the conditioner is controlled separately, for example, divided into sections or three sections. When the temperature changes abnormally, the steam in the section closest to the feeder outlet is immediately shut off. Then, a certain delay is set to close the valves of the second and third sections. In this way, steam will not enter the feeder, and the tail material can continue to be heated.

[0045] Example 5 In this embodiment, for more precise control, a material level sensor can be retained in the granulation hopper. When the material has not reached the material level sensor, the temperature sensor detects it at a first time interval t. When the material reaches the material level sensor, it means that the hopper is about to be emptied. At this time, there is still a small amount of material being conveyed in the feeder. At this time, the temperature sensor increases the detection frequency and detects it at a second time interval t', which is shorter than the first time interval.

[0046] If the level sensor does not detect a bottom level signal, but the temperature sensor still shows an abnormal temperature rise, it means that the level sensor is faulty or there is bridging in the silo. In this case, the shutdown procedure should still be executed.

[0047] The load variation pattern of the pellet mill is the same as that of the temperature variation pattern mentioned above. After the steam stops, the pellet mill enters the shutdown preparation stage.

[0048] During normal production, the load of the pellet mill is maintained at a high level and fluctuates up and down. After entering the shutdown preparation stage, less and less material is fed in, and the load shows a linear fluctuation and decrease. After the load stabilizes for a period of time under no-load conditions, the mill is shut down in the above order.

[0049] The specific load is related to the characteristics of the raw materials, production capacity and other parameters, and will not be given specific examples here.

[0050] The above embodiments are only for illustrating the technical features and concepts of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and embodiments of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A shutdown control method for a granulation unit, characterized in that, The granulation device includes a granulation bin, a feeder, a conditioner, a preservation device, and a granulator main unit. A temperature sensor is installed at the outlet of the feeder to acquire the temperature data of the feeder outlet. A steam assembly is installed on the conditioner, and a steam control valve is installed on the steam assembly. The control method is as follows: During normal production, the temperature at the feeder outlet is T1-T2; the current of the pellet mill main unit is I1-I2. When the temperature sensor detects an abnormally rapid rise in the temperature at the feeder outlet, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed. Real-time monitoring of the current data of the granulator main unit; When the current of the main unit of the granulator drops to the no-load current and remains there for 5-10 seconds, it is determined that the main unit of the granulator is in a no-load state and the material in the conditioner is discharged. The conditioner is then turned off layer by layer from top to bottom, and then the main unit of the granulator is turned off to complete the shutdown.

2. The granulation device shutdown control method according to claim 1, characterized in that, When the temperature sensor detects that the temperature at the feeder outlet rises to T3-T4, where T3 = 1.2 T1 and T4 = 1.2 T2, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut off, and the steam control valve of the conditioner is closed.

3. The granulation device shutdown control method according to claim 1, characterized in that, The time interval for temperature detection by the temperature sensor is set to t, and adjacent time intervals t1-t are continuously recorded. n Calculate the average temperature difference. When at a certain time point t i If the temperature difference exceeds twice the average value, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut down, and the steam control valve of the conditioner is closed.

4. The granulation device shutdown control method according to claim 1, characterized in that, The conditioner is provided with a plurality of steam components arranged sequentially along its length, and each steam component is provided with a steam control valve. When the temperature sensor detects an abnormally rapid rise in the temperature at the feeder outlet, it is determined that there is no material inside the granulation bin and the feeder. The feeder is then shut off, and the steam valve of the steam assembly closest to the feeder outlet is immediately closed. A delay time t is then set. 延时 From the inlet to the outlet of the conditioner, the steam control valves of the corresponding steam components are closed sequentially.

5. The granulation device shutdown control method according to claim 3, characterized in that, A material level sensor is installed on the granulation bin; When the material does not reach the level sensor, the temperature sensor detects it at the first time interval t. When the material reaches the level sensor, it means that the hopper is about to be emptied. A small amount of material is being conveyed in the feeder. The temperature sensor increases the detection rate and performs detection at a second time interval t', which is less than the first time interval t. If the level sensor does not detect that the material level has reached the bottom, and the temperature sensor still shows an abnormal temperature rise, then the level sensor is faulty, or there is bridging in the silo, and the machine should be shut down.

6. The granulation device shutdown control method according to claim 1, characterized in that, The pelleting bin, feeder, conditioner, preservative, and pellet mill main unit are arranged in order from top to bottom.

7. The granulation device shutdown control method according to claim 1, characterized in that, The conditioner includes at least two conditioners, with the conditioner disposed between the feeder and the retainer, and between the feeder and the main unit of the pellet mill.

8. The granulation device shutdown control method according to claim 1, characterized in that, During normal production, the temperature at the feeder outlet, T1-T2, is slightly higher than room temperature.

9. The granulation device shutdown control method according to claim 1, characterized in that, During normal production, the temperature at the feeder outlet is 35-45℃.

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