Anti-blocking control method and system for spiral conveying device and spiral conveying device

Abstract

The invention provides an anti-blocking control method and system for a spiral conveying device and the spiral conveying device, and belongs to the technical field of material conveying equipment. The method comprises the following steps: acquiring real-time current data of a spiral motor of the spiral conveying device; based on the quantitative relation between the preset filling rate and the current value of the spiral motor, the real-time filling rate of the materials in the spiral conveying device is determined according to the real-time current data; comparing the real-time filling rate with a preset anti-blocking threshold value; under the condition that the real-time filling rate is larger than or equal to a preset anti-blocking threshold value, it is judged that the blocking risk exists, speed increasing operation is executed, and the speed increasing operation comprises the step that an instruction is sent to the variable frequency driving module to increase the rotating speed of the spiral motor. And the active anti-blocking effect of the spiral conveying device is achieved, the risk of manual disassembly and blockage clearing is reduced, and a guarantee is provided for continuous operation of the whole system.

Description

Technical Field

[0001] This application relates to the field of material conveying equipment technology, specifically to an anti-blocking control method, system, and screw conveying device for a screw conveyor. Background Technology

[0002] Offshore drilling platforms continuously generate large quantities of high-viscosity drill cuttings with fluctuating flow rates during oil and gas extraction. These cuttings need to be transported over long distances to a recycling system. Due to their strong sealing structure and stability in the high-humidity, high-salt marine environment, screw conveyors have become the core equipment for drill cuttings transportation. However, when the volume of drill cuttings transported suddenly increases, screw conveyors are prone to blockages. Drill cuttings accumulation leads to increased filling rates and increased torque on the screw blades, resulting in a decrease in material conveying speed. This can cause stalling and accidents, and can also overload and damage the screw motor, requiring manual shutdown and cleaning. Existing anti-blockage methods for screw conveyors mainly rely on passive fault alarms and lack proactive anti-blockage adjustment capabilities. Summary of the Invention

[0003] The purpose of this application is to provide an anti-clogging control method, system, and screw conveyor for a screw conveyor.

[0004] To achieve the above objectives, the first aspect of this application provides an anti-blocking control method for a screw conveyor, comprising: Obtain real-time current data of the screw motor of the screw conveyor; Based on the preset quantitative relationship between the filling rate and the screw motor current value, the real-time filling rate of the material in the screw conveyor is determined according to the real-time current data. Compare the real-time fill rate with the preset anti-blocking threshold; If the real-time filling rate is greater than or equal to the preset anti-blocking threshold, a blockage risk is determined, and an acceleration operation is performed. The acceleration operation includes sending a command to the variable frequency drive module to increase the speed of the screw motor.

[0005] In this embodiment, the variable frequency drive module includes a frequency converter. When the real-time filling rate is greater than or equal to a preset anti-blocking threshold, the module determines that there is a risk of blockage and performs a speed-up operation, including: when the real-time filling rate is continuously greater than or equal to the preset anti-blocking threshold for a first preset duration, the module determines that the screw conveyor has a level one blockage risk and sends a command to the frequency converter; the frequency converter controls the screw motor to perform a linear speed-up operation at a preset rate, and the module monitors the change in the real-time filling rate after the speed-up.

[0006] In this embodiment of the application, the anti-blocking control method further includes: after using the frequency converter to control the screw motor to perform linear speed-up operation at a preset rate, if the real-time filling rate detected again is still greater than the preset anti-blocking threshold, it is determined that there is a secondary blockage risk in the screw conveyor, and the screw motor is controlled to reverse the rotation for a preset number of turns, and the screw motor is controlled to perform linear speed-up operation at the preset rate again.

[0007] In this embodiment of the application, the anti-blocking control method further includes: when the real-time filling rate is lower than a preset energy-saving threshold, using a frequency converter to reduce the speed of the screw motor to a first preset energy-saving speed.

[0008] In this embodiment of the application, the anti-blocking control method further includes: after reducing the speed of the screw motor to a preset energy-saving speed using a frequency converter, acquiring the real-time current data of the screw motor again; determining the real-time filling rate of the material in the screw conveyor again based on the real-time current data and the quantitative relationship; and reducing the speed of the screw motor to a second preset energy-saving speed using a frequency converter when the real-time filling rate remains below a preset energy-saving threshold for a second preset duration, wherein the second preset energy-saving speed is less than the first preset energy-saving speed.

[0009] In this embodiment of the application, the anti-blocking control method further includes: when the real-time current data rises sharply and exceeds a preset emergency current threshold, determining that the screw conveyor has a level 3 blockage risk, and cutting off the power supply to the screw conveyor.

[0010] In this embodiment of the application, the anti-blocking control method further includes: before acquiring the real-time current data of the screw motor of the screw conveyor, acquiring multiple sample filling rate data and corresponding sample current data of the screw motor when the screw conveyor is conveying sample materials; and plotting a calibration curve based on the sample filling rate data and sample current data to obtain a quantitative relationship between the filling rate and the screw motor current value.

[0011] In this embodiment, the spiral conveyor is a cuttings conveyor for an offshore drilling platform.

[0012] A second aspect of this application provides an anti-clogging control system for a screw conveyor, comprising: The sensor acquisition module is used to acquire real-time current data of the screw motor of the screw conveyor. The controller module is used to determine the real-time filling rate of the material in the screw conveyor based on the preset quantitative relationship between the filling rate and the screw motor current value, and according to the real-time current data. The variable frequency drive module is used to determine the risk of blockage and perform speed-up operation when the real-time fill rate is greater than or equal to the preset anti-blockage threshold.

[0013] A second aspect of this application provides a screw conveyor device, including: the aforementioned anti-clogging control system for the screw conveyor device.

[0014] The above technical solution acquires real-time current data of the screw motor. Based on a preset quantitative relationship between the filling rate and the screw motor current value, the real-time filling rate of the material in the screw conveyor is determined according to the real-time current data. When the real-time filling rate is greater than or equal to a preset filling threshold, a command is sent to the frequency converter drive module to increase the screw motor speed. Since an increase in the amount of material in the screw conveyor leads to an increase in motor load, which in turn causes the screw motor current to rise, the screw speed is increased by adjusting the screw speed when the real-time filling rate is detected to be greater than or equal to the preset filling threshold. Through the coordinated adjustment of speed and torque, the material in the conveyor is evenly spread, achieving the effect of preventing material accumulation and blockage. This system achieves proactive anti-blockage, replacing manual unblocking, ensuring continuous operation of the entire system, and achieving "prevention before the event" instead of "retrofit maintenance."

[0015] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 The schematic diagram illustrates a flow chart of an anti-blocking control method for a screw conveyor according to an embodiment of this application; Figure 2 The schematic diagram illustrates the principle of an anti-blocking control method for a screw conveyor according to an embodiment of this application; Figure 3 This schematically illustrates yet another flow diagram of an anti-blocking control method for a screw conveyor according to an embodiment of this application; Figure 4 This schematic diagram illustrates a structural block diagram of an anti-clogging control system for a screw conveyor according to an embodiment of the present application; Figure 5 The diagram illustrates the internal structure of a computer device according to an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] Figure 1 A schematic flowchart illustrating an anti-clogging control method for a screw conveyor according to an embodiment of this application is shown. Figure 1 As shown in one embodiment of this application, an anti-clogging control method for a screw conveyor is provided, comprising the following steps: Step 101: Obtain the real-time current data of the screw motor of the screw conveyor.

[0019] Step 102: Based on the preset quantitative relationship between the filling rate and the screw motor current value, determine the real-time filling rate of the material in the screw conveyor according to the real-time current data.

[0020] Step 103: Compare the real-time filling rate with the preset anti-blocking threshold.

[0021] Step 104: If the real-time filling rate is greater than or equal to the preset anti-blocking threshold, it is determined that there is a risk of blockage, and a speed-up operation is performed. The speed-up operation includes sending a command to the variable frequency drive module to increase the speed of the screw motor.

[0022] A screw conveyor is a device that uses rotating helical blades to propel materials for transport. The screw conveyor includes a screw motor to drive its operation. The processor acquires real-time current data from the screw motor and, based on a preset quantitative relationship between the filling rate and the motor current value, determines the real-time filling rate of the material within the screw conveyor. The filling rate refers to the degree to which the material fills the screw conveyor. The processor then compares the real-time filling rate with the preset filling rate. If the real-time filling rate is greater than or equal to a preset anti-clogging threshold, the processor determines that there is a risk of clogging and sends a command to the frequency converter drive module to increase the screw motor's speed. The synergistic effect of speed and torque ensures that the material within the screw conveyor is evenly distributed, thus preventing clogging.

[0023] In one embodiment, before acquiring the real-time current data of the screw motor of the screw conveyor, multiple sample fill rate data and corresponding sample current data of the screw motor are acquired when the screw conveyor is conveying sample materials. A calibration curve is then plotted based on the sample fill rate data and sample current data to obtain a quantitative relationship between the fill rate and the screw motor current value. For example, in one embodiment, representative samples of conveyed material properties can be selected, and multiple corresponding screw motor current values ​​can be collected within the fill rate range of 0-60%, and a calibration curve can be plotted to establish a quantitative relationship between the fill rate and the screw motor current value.

[0024] In one embodiment, the variable frequency drive module includes a frequency converter. When the real-time filling rate is greater than or equal to a preset anti-blocking threshold, determining a blockage risk and performing a speed-up operation includes: determining that the screw conveyor has a level-one blockage risk when the real-time filling rate remains greater than or equal to the preset anti-blocking threshold for a first preset duration, and issuing a command to the frequency converter; using the frequency converter to control the screw motor to perform a linear speed-up operation at a preset rate, and monitoring the change in the real-time filling rate after speed-up. For example, in one embodiment, the preset anti-blocking threshold is 35%, the first preset duration is 10 seconds, and the real-time current value of the screw motor exceeds 85% of the rated current for 10 seconds. Based on the preset quantitative relationship between the filling rate and the screw motor current value, it is determined that the real-time current value of 85% of the screw motor's rated current corresponds to a real-time filling rate of 35% for the material in the screw conveyor. Therefore, it is determined that the real-time filling rate remains greater than or equal to the preset anti-blocking threshold for a first preset duration, indicating a level-one blockage risk in the screw conveyor. The frequency converter controls the screw motor to perform a linear speed-up operation at 5% of the rated speed per second. The synergistic effect of speed and torque ensures that the material in the screw conveyor is evenly spread, thereby achieving anti-blockage. During the linear acceleration process, the maximum speed of the screw motor shall not exceed 120% of the rated speed.

[0025] In one embodiment, after controlling the screw motor with a frequency converter to perform a linear acceleration operation at a preset rate, if the real-time filling rate is still greater than the preset anti-blocking threshold, it is determined that the screw conveyor has a secondary blockage risk. The screw motor is then controlled to reverse a preset number of revolutions, and the screw motor is again controlled to perform a linear acceleration operation at the preset rate. For example, in one embodiment, if the real-time current of the screw motor does not decrease to 85% of the rated current within 30 seconds after the linear acceleration operation, meaning the real-time filling rate of the screw conveyor does not decrease to the preset anti-blocking threshold (35%), then it is determined that the screw conveyor has a secondary blockage risk, a yellow warning is displayed, and the screw motor is controlled to reverse 2 revolutions briefly. After reversing, the screw motor is again controlled to perform a linear acceleration operation at a rate of 5% of the rated speed per second.

[0026] In one embodiment, if the real-time current data rises sharply and exceeds a preset emergency current threshold, it is determined that the screw conveyor has a level 3 blockage risk, and the power supply to the screw conveyor is cut off. For example, in one embodiment, if the real-time current of the screw motor is detected to exceed 120% of the rated current of the screw motor within 5 seconds, it is determined that the screw conveyor has a level 3 blockage risk, triggering the emergency stop indicator light to remain on, and the power supply to the screw conveyor is cut off to prevent an accident from occurring or escalating.

[0027] In one embodiment, the anti-blocking control method further includes: when the real-time filling rate is continuously lower than a preset energy-saving threshold, using a frequency converter to reduce the speed of the screw motor to a first preset energy-saving speed. For example, in one embodiment, the preset energy-saving threshold is 10%. When the real-time filling rate of the screw conveyor is detected to be lower than 10%, the screw motor is controlled to reduce its speed to 60% to 80% of its rated speed to reduce energy consumption.

[0028] In one embodiment, after reducing the speed of the screw motor to a preset energy-saving speed using a frequency converter, the real-time current data of the screw motor is acquired again. Based on the real-time current data and quantitative relationship, the real-time filling rate of the material in the screw conveyor is determined again. If the real-time filling rate remains below a preset energy-saving threshold for a second preset duration, the speed of the screw motor is reduced to a second preset energy-saving speed using a frequency converter, wherein the second preset energy-saving speed is less than the first preset energy-saving speed. For example, in one embodiment, after reducing the speed of the screw motor to the preset energy-saving speed using a frequency converter, if the actual filling rate of the screw conveyor remains below 10% for 5 minutes, the screw motor is further controlled to reduce its speed to 20% of its rated speed and idle in standby mode to further reduce energy consumption.

[0029] In one embodiment, the screw conveyor is a drill cuttings conveying device for offshore drilling platforms. Offshore drilling platforms continuously generate large quantities of high-viscosity drill cuttings with fluctuating flow rates during oil and gas extraction, requiring long-distance transport to a recycling and processing system. The screw conveyor, with its strong sealing structure and stability in the high-humidity, high-salt marine environment, is a core component of drill cuttings conveying equipment.

[0030] Through the above embodiments, real-time current data of the screw motor is obtained. Based on the preset quantitative relationship between the filling rate and the screw motor current value, the real-time filling rate of the material in the screw conveyor is determined according to the real-time current data. When the real-time filling rate is greater than or equal to the preset filling threshold, a command is sent to the frequency converter drive module to increase the speed of the screw motor. Since an increase in the amount of material in the screw conveyor will lead to an increase in the motor load, which in turn will cause the screw motor current to rise, when the real-time filling rate is detected to be greater than or equal to the preset filling threshold, the screw speed is increased by regulating. Through the coordinated adjustment of speed and torque, the material in the conveyor is evenly spread, achieving the effect of preventing material accumulation and blockage. The system achieves active anti-blockage, replacing manual clearing, and achieving "prevention before the event" instead of "post-event maintenance". Furthermore, the conveying speed can be adjusted according to the state of the conveyed material, changing the previous passive clearing to active anti-blockage. When the filling rate is low, the speed is dynamically reduced to reduce energy consumption.

[0031] Figure 1 This is a flowchart illustrating an anti-clogging control method for a screw conveyor in one embodiment. It should be understood that, although... Figure 1 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise explicitly stated herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0032] In one embodiment, the screw conveyor includes a programmable logic controller (PLC), such as Figure 2 As shown, the anti-clogging control method for a screw conveyor includes: acquiring real-time current data of the screw motor of the screw conveyor; converting real-time current into real-time filling rate based on a preset quantitative relationship between the filling rate and the screw motor current value to obtain the real-time filling rate of the screw conveyor; comparing the real-time filling rate with a preset anti-clogging threshold using a PLC; and issuing a command to the frequency converter drive module based on the comparison result to control the speed of the screw motor using the frequency converter in the frequency converter drive module. Specifically, as shown... Figure 3 As shown, Figure 3This illustration schematically shows another flow diagram of the anti-blocking control method for a screw conveyor according to an embodiment of this application. If the real-time current value of the screw motor exceeds 85% of the rated current for 10 seconds, i.e., the real-time filling rate is equal to or greater than the preset anti-blocking threshold for 10 seconds, the screw conveyor is determined to have a first-level blockage risk. The screw motor is then linearly accelerated at 5% of its rated speed per second using a frequency converter. The synergistic effect of speed and torque ensures uniform material distribution within the screw conveyor, thereby preventing blockage. During the linear acceleration, the screw motor's speed does not exceed 120% of its rated speed. If, within 30 seconds after the linear acceleration, the real-time current of the screw motor has not decreased to 85% of the rated current, i.e., the real-time filling rate of the screw conveyor has not decreased to the preset anti-blocking threshold (35%), the screw conveyor is determined to have a second-level blockage risk. The explosion-proof cabinet displays a yellow warning and the screw motor is briefly reversed two revolutions. After reversal, the screw motor is again linearly accelerated at 5% of its rated speed per second. If the real-time current of the screw motor exceeds 120% of its rated current within 5 seconds, a level 3 blockage risk is identified in the screw conveyor. This triggers the emergency stop indicator light to illuminate continuously and the power supply to the screw conveyor to prevent an accident from occurring or escalating. If the real-time fill rate of the screw conveyor is below 10%, the screw motor speed is reduced to 60%–80% of its rated speed to reduce energy consumption. After reducing the screw motor speed to a preset energy-saving speed using a frequency converter, if the actual fill rate of the screw conveyor remains below 10% for 5 minutes, the screw motor speed is further reduced to 20% of its rated speed for idling to further reduce energy consumption. If the real-time current of the screw motor is between 10% and 85% of its rated current, the current speed is maintained.

[0033] In one embodiment, such as Figure 4 As shown, an anti-blocking control system for a screw conveyor is provided, including a sensor acquisition module, a controller module, and a frequency converter drive module, wherein: The sensor acquisition module 401 is used to acquire real-time current data of the screw motor of the screw conveyor.

[0034] The controller module 402 is used to determine the real-time filling rate of the material in the screw conveyor based on the preset quantitative relationship between the filling rate and the screw motor current value and the real-time current data. The variable frequency drive module 403 is used to determine the risk of blockage when the real-time fill rate is greater than or equal to the preset anti-blockage threshold, and to perform speed-up operation.

[0035] Specifically, the sensor acquisition module includes a current transformer that surrounds the three-phase power supply cable of the spiral motor, acquiring the three-phase current signal of the motor in real time and transmitting it to the controller module. The controller module is configured as a PLC. The current transformer transmits the acquired three-phase current signal of the motor in real time through an analog cable and inputs it to the PLC via an analog interface. The frequency converter control module includes a frequency converter connected to the PLC, used to receive PLC commands to dynamically adjust the motor speed. In one embodiment, the frequency converter control module may also include an explosion-proof motor.

[0036] The anti-blocking control system for the screw conveyor includes a processor and a memory. The aforementioned sensor acquisition module, controller module, and frequency conversion drive module are all stored as program units in the memory, and the processor executes the aforementioned program modules stored in the memory to implement the corresponding functions.

[0037] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and adjusting kernel parameters enables anti-blocking control methods for the screw conveyor.

[0038] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0039] This application provides a storage medium storing a program that, when executed by a processor, implements the aforementioned anti-blocking control method for a screw conveyor.

[0040] This application provides a processor for running a program, wherein the program executes the above-described anti-blocking control method for a screw conveyor.

[0041] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 5 As shown in the figure, the computer device includes a processor A01, a network interface A02, and a memory (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The network interface A02 is used for communication with external terminals via a network connection. When executed by the processor A01, the computer program B02 implements an anti-blocking control method for a screw conveyor.

[0042] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0043] This application provides a computer (electronic) device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of any of the above-mentioned anti-blocking control methods for a screw conveyor.

[0044] This application also provides a computer program product that, when executed on a data processing device, is adapted to perform a program that initializes a method for preventing blockages in a screw conveyor.

[0045] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0046] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0047] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0048] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0049] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0050] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0051] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0053] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for preventing blockage in a screw conveyor, characterized in that, The anti-blocking control method includes: Obtain the real-time current data of the screw motor of the screw conveyor; Based on the preset quantitative relationship between the filling rate and the current value of the screw motor, the real-time filling rate of the material in the screw conveyor is determined according to the real-time current data. The real-time fill rate is compared with a preset anti-blocking threshold. If the real-time filling rate is greater than or equal to the preset anti-blocking threshold, a blockage risk is determined, and an acceleration operation is performed. The acceleration operation includes sending a command to the frequency converter drive module to increase the speed of the screw motor.

2. The anti-blocking control method for a screw conveyor according to claim 1, characterized in that, The variable frequency drive module includes a frequency converter. The step of determining a blockage risk and performing a speed-up operation when the real-time fill rate is greater than or equal to the preset anti-blockage threshold includes: If the real-time filling rate is continuously greater than or equal to the preset anti-blocking threshold for a first preset duration, it is determined that the screw conveyor has a level one blockage risk and an instruction is sent to the frequency converter. The frequency converter is used to control the spiral motor to perform a linear speed-up operation at a preset rate, and the change in the real-time filling rate is monitored after the speed-up.

3. The anti-blocking control method for a screw conveyor according to claim 2, characterized in that, The anti-blocking control method also includes: After the variable frequency drive is used to control the screw motor to perform linear speed-up operation at a preset rate, if the real-time filling rate is still greater than the preset anti-blocking threshold, it is determined that the screw conveyor has a secondary blockage risk, and the screw motor is controlled to reverse the rotation for a preset number of turns, and the screw motor is controlled to perform linear speed-up operation at the preset rate again.

4. The anti-blocking control method for a screw conveyor according to claim 1, characterized in that, The anti-blocking control method also includes: If the real-time filling rate is lower than the preset energy-saving threshold, the speed of the spiral motor is reduced to the first preset energy-saving speed using a frequency converter.

5. The anti-clogging control method for a screw conveyor according to claim 4, characterized in that, The anti-blocking control method also includes: After the speed of the spiral motor is reduced to the preset energy-saving speed using the frequency converter, the real-time current data of the spiral motor is acquired again. Based on the real-time current data and the quantitative relationship, the real-time filling rate of the material in the screw conveyor is determined again; If the real-time fill rate remains below a preset energy-saving threshold for a second preset duration, the speed of the spiral motor is reduced to a second preset energy-saving speed using the frequency converter, wherein the second preset energy-saving speed is less than the first preset energy-saving speed.

6. The anti-clogging control method for a screw conveyor according to claim 1, characterized in that, The anti-blocking control method also includes: If the real-time current data rises sharply and exceeds the preset emergency current threshold, it is determined that the screw conveyor has a level 3 blockage risk, and the power supply to the screw conveyor is cut off.

7. The anti-blocking control method for a screw conveyor according to claim 1, characterized in that, The anti-blocking control method also includes: Before acquiring the real-time current data of the screw motor of the screw conveyor, acquire multiple sample filling rate data and the corresponding sample current data of the screw motor when the screw conveyor is conveying sample materials. A calibration curve is plotted based on the sample fill rate data and the sample current data to obtain a quantitative relationship between the fill rate and the screw motor current value.

8. The anti-blocking control method for a screw conveyor according to any one of claims 1 to 7, characterized in that, The spiral conveyor is a cuttings conveyor for offshore drilling platforms.

9. A blockage prevention control system for a screw conveyor, characterized in that, include: The sensor acquisition module is used to acquire real-time current data of the screw motor of the screw conveyor. The controller module is used to determine the real-time filling rate of the material in the screw conveyor based on the real-time current data, according to the preset quantitative relationship between the filling rate and the screw motor current value. The variable frequency drive module is used to determine the risk of blockage when the real-time fill rate is greater than or equal to a preset anti-blockage threshold, and to perform an acceleration operation.

10. A screw conveyor device, characterized in that, Includes the anti-clogging control system for a screw conveyor as described in claim 9.

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