Rare earth powder intelligent driving anti-sticking conveying system and control method

Abstract

The invention relates to the technical field of conveying equipment, in particular to a rare earth powder intelligent driving anti-sticking conveying system and a control method.The system comprises a feeding device and a spiral conveyor, and piezoelectric films cover the surface of a center shaft of the spiral conveyor, the surface of a spiral blade of the spiral conveyor and the surface of the inner wall of a machine shell correspondingly; the accumulation and adhesion conditions of rare earth materials are sensed in real time through the piezoelectric film, mechanical stress is converted into voltage signals through the direct piezoelectric effect, the valve opening degree is dynamically adjusted to maintain the stable conveying amount, and the situation that the electrolysis efficiency is reduced due to excessive accumulation of rare earth in an electrolysis furnace is prevented; meanwhile, the piezoelectric films of the independent units are driven to vibrate through the inverse piezoelectric effect, rare earth materials adhering to the interior of the spiral conveyor are automatically cleaned, it is guaranteed that the conveying process is smooth, and the service life of equipment is prolonged. According to the rare earth conveying device, automation, precision and high efficiency of rare earth conveying are achieved, the production efficiency is remarkably improved, the manual intervention and maintenance cost is reduced, and the defects of existing equipment are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of conveying equipment, and particularly relates to an intelligent drive anti-sticking conveying system and control method for rare earth powder. Background Art

[0002] Rare earth molten salt electrolysis is a process that uses direct current to initiate chemical changes in an electrolytic cell. Through the oxidation-reduction reaction between the cathode and the anode, rare earth metal ions obtain electrons at the cathode and are reduced to rare earth metals. This process is usually carried out at a high temperature of 1000 - 1200 °C to ensure that the rare earth fluoride melt can be fully electrolyzed. The rare earth molten salt electrolysis equipment mainly consists of two parts: a conveying device and an electrolytic furnace. The conveying device is responsible for continuously and stably feeding the raw rare earth into the electrolytic furnace, and the electrolytic furnace is the core equipment for realizing the reduction of rare earth metals.

[0003] Traditional rare earth molten salt electrolysis equipment usually adopts an intermittent feeding method, that is, a certain amount of raw rare earth is fed into the electrolytic furnace every five minutes. Although this feeding method is simple and easy to implement, it also has obvious defects. First of all, intermittent feeding will cause the electrolytic furnace to receive a large amount of rare earth raw materials in a short time, resulting in excessive accumulation of rare earth. Due to the limited reaction rate in the electrolytic furnace, the input of a large amount of rare earth in a short time will cause the electrolysis reaction to not have enough time to proceed fully, thereby reducing the efficiency of rare earth molten salt electrolysis. Secondly, excessive accumulation of rare earth will also lead to uneven temperature and current distribution in the electrolytic furnace, further affecting the stability of the electrolysis process and the output quality of rare earth metals.

[0004] In addition, during the traditional feeding process, due to the certain viscosity of rare earth raw materials, they are prone to adhere inside the conveyor. This adhesion phenomenon not only makes the conveying process difficult, reduces the conveying efficiency, but also increases the wear of the spiral blades and shortens the service life of the screw conveyor. Over time, the adhered rare earth materials will gradually accumulate, resulting in an increase in the operating resistance of the conveyor, and may even cause equipment failures, increasing the maintenance cost and production downtime. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent drive anti-sticking conveying system and control method for rare earth powder, aiming to solve the technical problems that existing rare earth materials are prone to accumulation due to the process and are easy to adhere inside the screw conveyor during the conveying process, affecting the smoothness of the conveying process and the service life of the equipment.

[0006] To achieve the above purpose, the present invention provides an intelligent drive anti-sticking conveying system for rare earth powder, including a feeding device and a screw conveyor, and the feeding device and the screw conveyor are connected in sequence;

[0007] The feeding device includes a split silo, an upper valve and a lower valve. The upper valve divides the split silo into upper and lower parts, and the lower valve is arranged between the split silo and the screw conveyor;

[0008] The screw conveyor includes a motor, a central shaft, screw blades and a casing. The surfaces of the central shaft, the screw blades and the inner wall of the casing are all covered with a layer of piezoelectric film, and the piezoelectric film is respectively composed of a plurality of independent units spliced together.

[0009] Among them, the shape of the independent unit of the piezoelectric film on the central shaft is a parallelogram, and the shape of the independent unit of the piezoelectric film on the inner wall of the casing is set as a rectangle.

[0010] Among them, the shape of the independent unit of the piezoelectric film on the screw blade is determined by the side sectional shape of the screw blade, and the ring is divided into six parts to cover different areas on the side of each screw blade.

[0011] Among them, both ends of the piezoelectric film in each independent unit of the piezoelectric film are fixed ends, and there is a certain gap in the middle with the surface.

[0012] Furthermore, the present invention also proposes an intelligent drive anti-adhesion conveying control method for rare earth powder. Using the intelligent drive anti-adhesion conveying system for rare earth powder, it includes the following steps:

[0013] Step 1: Control the upper valve to stack rare earth raw materials;

[0014] Step 2: Receive the feeding signal or the piezoelectric feedback value of the previous conveying, adjust the opening of the lower valve, and open the upper valve to feed;

[0015] Step 3: Start the motor to enter the conveying stage;

[0016] Step 4: Real-time collect the voltage signals of each independent unit of the piezoelectric film. When the detected voltage in the screw blade area becomes larger, adjust the opening of the lower valve through the PID algorithm to maintain the conveying volume within the range of ±2% of the set value;

[0017] Step 5: After completing a single conveying, switch to the anti-adhesion detection mode;

[0018] Step 6: After the anti-adhesion detection is completed, complete the feeding or return to Step 1 to execute.

[0019] Optionally, during the execution of the anti-adhesion detection mode, there are two working modes: all-unit vibration and local-unit vibration. In the all-unit vibration mode, all the independent units of the piezoelectric film will vibrate continuously during conveying to prevent rare earth from adhering; in the local-unit vibration mode, the control module outputs an alternating voltage to the independent units of the piezoelectric film with adhered rare earth to shake off the adhered rare earth.

[0020] The present invention provides an intelligent drive anti - sticking conveying system and control method for rare - earth powder. The system includes a feeding device and a screw conveyor. Piezoelectric films are respectively covered on the surface of the central shaft, the screw blades and the inner wall of the casing of the screw conveyor. The piezoelectric films are used to sense the accumulation and adhesion of rare - earth materials in real - time, convert mechanical stress into voltage signals by the direct piezoelectric effect, dynamically adjust the valve opening to maintain a stable conveying volume, and prevent excessive accumulation of rare - earth materials in the electrolytic furnace, thereby reducing the electrolysis efficiency. At the same time, the piezoelectric films of independent units are driven to vibrate by the inverse piezoelectric effect to automatically clean the rare - earth materials adhered to the inside of the screw conveyor, ensuring a smooth conveying process and extending the service life of the equipment. The present invention realizes the automation, precision and high - efficiency of rare - earth conveying, significantly improves the production efficiency, reduces the manual intervention and maintenance costs, provides reliable technical support for the rare - earth molten - salt electrolysis process, and makes up for the deficiencies of existing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 FIG. is a schematic structural diagram of an intelligent drive anti - sticking conveying system for rare - earth powder according to the present invention.

[0023] Figure 2 FIG. is a schematic diagram of the internal piezoelectric film layout of an intelligent drive anti - sticking conveying system for rare - earth powder according to the present invention.

[0024] Figure 3 FIG. is a schematic side view of a single - piece screw blade of an intelligent drive anti - sticking conveying system for rare - earth powder according to the present invention.

[0025] Figure 4 FIG. is a schematic diagram of the vibration of a single - piece piezoelectric film according to the present invention.

[0026] Figure 5 FIG. is a schematic diagram of the anti - sticking effect of an intelligent drive anti - sticking conveying system for rare - earth powder according to the present invention.

[0027] 1 - Split - type silo, 2 - Upper valve, 3 - Lower valve, 4 - Motor, 5 - Central shaft, 6 - Screw blade, 7 - Casing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0029] Please refer to Figure 1 and Figure 2 , the present invention provides an intelligent drive anti-sticking conveying system for rare earth powder, including a feeding device and a screw conveyor, and the feeding device and the screw conveyor are connected in sequence;

[0030] The feeding device includes a split bin 1, an upper valve 2 and a lower valve 3. The upper valve 2 divides the split bin 1 into upper and lower parts, and the lower valve 3 is arranged between the split bin and the screw conveyor;

[0031] The screw conveyor includes a motor 4, a central shaft 5, a screw blade 6 and a casing 7. The surfaces of the central shaft 5, the screw blade 6 and the inner wall of the casing 7 are all covered with a layer of piezoelectric film, and the piezoelectric film is respectively composed of a plurality of independent units spliced together.

[0032] In this embodiment, the upper half of the split bin 1 is the raw material accumulation place, and the lower half is the pre-feeding place. The electrodes of the piezoelectric film are introduced into the wire inside the central shaft 5 through the inside of the screw blade 6, and the piezoelectric film on the inner wall of the conveyor casing 7 is directly introduced into the wire of the casing 7.

[0033] Furthermore, the shape of the independent unit of the piezoelectric film on the central shaft 5 is a parallelogram, and the shape of the independent unit of the piezoelectric film on the inner wall of the casing 7 is set as a rectangle. The piezoelectric film on the central shaft 5 is a connected parallelogram, and the arrangement of the piezoelectric film on the inner wall of the conveyor casing 7 is a connected rectangle. Similarly, the accuracy of control is improved by setting a plurality of independent units.

[0034] Please refer to Figure 3 , the shape of the independent unit of the piezoelectric film on the screw blade is determined by the cross-sectional shape of the screw blade, and the ring is divided into six parts to cover different areas on the side of each screw blade.

[0035] Specifically, as Figure 4 shown, at both ends of the piezoelectric film in each independent unit of the piezoelectric film are fixed ends, and there is a certain gap between the middle and the surface. When a voltage is applied to the piezoelectric film, it will generate continuous up and down vibrations to achieve the purpose of shaking off rare earth.

[0036] The present invention also proposes an intelligent drive anti-sticking conveying control method for rare earth powder, which uses the above-mentioned intelligent drive anti-sticking conveying system for rare earth powder, and includes the following steps:

[0037] Step 1: Control the upper valve to stack rare earth raw materials.

[0038] Step 2: Receive the feeding signal or the piezoelectric feedback value of the previous conveyance, adjust the opening degree of the lower valve, and open the upper valve for feeding.

[0039] Step 3: Start the motor to enter the conveyance stage.

[0040] Step 4: Collect the voltage signals of each piezoelectric film independent unit in real time. When the detected voltage in the spiral blade area increases, adjust the opening degree of the lower valve through the PID algorithm to maintain the conveyance volume within the range of ±2% of the set value.

[0041] Step 5: After completing a single conveyance, switch to the anti-sticking detection mode.

[0042] Step 6: After the anti-sticking detection is completed, complete the feeding or return to Step 1 for execution.

[0043] During the execution of the anti-sticking detection mode, there are two working modes: all-unit vibration and local-unit vibration. In the all-unit vibration mode, all piezoelectric film independent units will vibrate continuously during conveyance to prevent rare earth adhesion. In the local-unit vibration mode, the control module outputs an alternating voltage to the piezoelectric film independent unit with adhered rare earth to shake off the adhered rare earth.

[0044] Adopting different working modes has the following effects respectively:

[0045] 1. All-unit vibration mode: In this mode, when conveyance starts, the control module directly outputs an alternating voltage, and all piezoelectric film units will vibrate continuously to prevent rare earth adhesion. The advantage of the all-unit vibration mode is that it eliminates the detection module and some control modules, reducing costs.

[0046] 2. Local-unit vibration mode: That is the action form mentioned in the technical solution. After conveyance ends and enters the detection stage, the control module outputs an alternating voltage to the piezoelectric film unit with adhered rare earth to shake off the adhered rare earth. The advantage of the local-unit vibration mode is energy conservation and precise control.

[0047] The conveyance and cleaning process of the comprehensive material has the following two stages:

[0048] 1. Conveying stage: At the raw material stacking location, the amount of each conveyance is fed into the pre-feeding location through the upper valve. The lower valve at the pre-feeding location controls the opening size through a feedback mechanism to feed rare earth into the screw conveyor. Specific feedback control method: When rare earth enters the screw conveyor, during the propulsion process, the rare earth will exert pressure and friction on the piezoelectric film covering the screw blades. These forces will cause the piezoelectric film to deform and generate voltage. According to the piezoelectric effect, the more rare earth accumulates, the greater the pressure exerted on the piezoelectric film. Therefore, the opening degree of the valve decreases as the voltage increases, enabling the propulsion equipment to maintain a stable conveying volume.

[0049] 2. Anti-rare earth adhesion stage: After each conveyance ends, the system enters the detection mode. The system consists of a voltage detection module, a control module, and a power supply module. The voltage detection module continuously collects the voltage signals generated by each unit of the piezoelectric film on the screw blades, the central shaft, and the inner wall of the conveyor housing. When rare earth adheres to the piezoelectric film, it will cause deformation and generate voltage. If the voltage received by the control module exceeds the preset threshold, it will control the power supply module to output an alternating voltage to drive the piezoelectric film of the corresponding unit to vibrate and shake off the rare earth. The detection mode of the system will detect the voltage of each independent unit. The units with voltage signals exceeding the preset threshold will receive the alternating voltage output by the power supply module, while the units with voltage lower than the preset threshold will not receive voltage. During the vibration process, the detection module will continuously monitor the voltage signal of the piezoelectric film. When the voltage of the piezoelectric film is lower than the preset threshold, it is determined that the adhered rare earth has been cleaned, and the control module stops outputting the alternating voltage and sends a signal to the upper valve at the raw material stacking location for a new round of feeding.

[0050] Regarding the anti-adhesion action form, please refer to Figure 5 , Figure 5 The figure shows a section of the screw conveyor intercepted at the end of one conveyance as a schematic diagram. Each area from No. 1 to No. 32 is an independent piezoelectric film unit. As can be seen from the figure, there are cases of rare earth adhesion on the inner wall of the screw conveyor at No. 1, 2, 5, 6 and on the central shaft at No. 13, 17, 18, 21, 22 respectively. At this time, the system enters the detection mode. Due to the adhesion of rare earth on the inner wall and the central shaft, it will exert a certain pressure on the corresponding piezoelectric film area. Due to the piezoelectric effect, the piezoelectric film will generate voltage. If the voltage received by the control module exceeds the preset threshold, it will control the power supply module to output an alternating voltage to drive the piezoelectric films at No. 1, 2, 5, 6 and No. 13, 17, 18, 21, 22 to vibrate and shake off the rare earth. During this process, other piezoelectric film units will not be driven, achieving the effect of precise control.

[0051] In order to clearly express the control function of the piezoelectric film in the rare earth molten salt electrolysis feeding device, the present invention also starts from the theoretical basis of the piezoelectric effect and combines its specific application in the system for theoretical analysis. The following is the detailed analysis process:

[0052] 1. Theoretical basis of piezoelectric effect

[0053] The piezoelectric effect is divided into the direct piezoelectric effect and the inverse piezoelectric effect, and their mathematical descriptions are as follows:

[0054] 1.1 Direct piezoelectric effect

[0055] When a piezoelectric thin film is subjected to a mechanical stress T, a charge density D (or voltage V) will be generated, and the relationship is:

[0056] D = d·T (1)

[0057] Where:

[0058] D is the charge density (unit: C / m 2 )

[0059] d is the piezoelectric constant (unit: C / N), indicating the ability of the material to convert mechanical energy into electrical energy;

[0060] T is the mechanical stress (unit: N / m 2 )

[0061] 1.2 Inverse piezoelectric effect

[0062] When an electric field E is applied to the piezoelectric thin film, a mechanical strain S will be generated, and the relationship is:

[0063] S = d·E (2)

[0064] Where:

[0065] S is the mechanical strain (unit: m / m);

[0066] E is the electric field strength (unit: V / m).

[0067] 2. Role of piezoelectric thin film in valve regulation

[0068] 2.1 Relationship between rare earth stacking amount and pressure

[0069] In a screw conveyor, the stacking amount m of rare earth materials will exert a pressure T on the screw blade:

[0070] According to the direct piezoelectric effect, the voltage signal V generated by the piezoelectric thin film is proportional to the pressure T:

[0071] V = k·T = k'·m (3)

[0072] Where k and k' are proportionality constants.

[0073] 2.2 Regulation of valve opening

[0074] The relationship between the valve opening θ and the voltage signal V is:

[0075] θ = θ max -k n ·V(4)

[0076] Where: θ max is the maximum opening of the valve;

[0077] K n is the adjustment coefficient.

[0078] When the rare earth accumulation amount m increases, the voltage signal V increases, and the valve opening θ decreases, thereby reducing the amount of rare earth entering.

[0079] 2.3 Control function

[0080] The rare earth accumulation amount is monitored in real time through the piezoelectric film, and the valve opening is dynamically adjusted to ensure that the rare earth material enters the electrolytic furnace at a stable flow rate.

[0081] This closed-loop control method avoids excessive accumulation of rare earth in the electrolytic furnace and improves the electrolysis efficiency.

[0082] 3. Role of the piezoelectric film in preventing rare earth adhesion

[0083] 3.1 Relationship between rare earth adhesion and pressure

[0084] When the rare earth material adheres to the screw conveyor, it exerts a pressure T on the piezoelectric film:

[0085] According to the direct piezoelectric effect, the piezoelectric film generates a voltage signal V:

[0086] V = k·T(5)

[0087] 3.2 Vibration cleaning mechanism

[0088] When it is detected that the voltage signal V of the independent unit exceeds the preset threshold, the system applies an alternating voltage Vac to the piezoelectric film:

[0089] V ac = V0·sin(2πft)(6)

[0090] Where:

[0091] V0 is the amplitude of the alternating voltage;

[0092] f is the vibration frequency.

[0093] According to the inverse piezoelectric effect, the piezoelectric film generates a mechanical vibration SS:

[0094]

[0095] where t is the thickness of the piezoelectric film.

[0096] 3.3 Control function

[0097] The vibration is transmitted to the piezoelectric film unit to shake off the adhered rare earth materials.

[0098] During the vibration process, the system continuously monitors the voltage signal V of the independent unit. When V is lower than the preset threshold, the vibration stops and the cleaning is completed.

[0099] Specifically, the present invention also proposes specific embodiments for auxiliary explanation:

[0100] 1. Composition of the Embodiment System Structure

[0101] This system includes two core components: a feeding device and a screw conveyor. The feeding device consists of a split bin and a valve mechanism: the upper part of the bin is a raw material storage bin, and the lower part is provided with a pre-feeding bin, which are connected by a pneumatic upper valve; the bottom of the pre-feeding bin is provided with an electric adjustable lower valve, and its opening can be continuously adjusted within the range of 0-100%. The screw conveyor includes an explosion-proof motor (power 7.5kW), a central shaft (diameter 150mm), and screw blades (pitch 200mm). Among them, the central shaft, screw blades, and the inner wall surface of the conveyor housing are all compounded with piezoelectric films.

[0102] 2. Piezoelectric Film Arrangement Scheme

[0103] The surface of the screw blade adopts a six-zone layout: each screw unit is radially divided into six independent piezoelectric units, using a 0.2mm thick PVDF piezoelectric film, and the electrode leads are connected to the central shaft wire through the internal channel of the blade. The surface of the central shaft is provided with closely connected rectangular piezoelectric film units (size 50×200mm), and the piezoelectric film units corresponding to the inner wall of the conveyor housing are arranged on the same surface as the central shaft. All piezoelectric units achieve independent addressing through flexible circuits, and the control accuracy can reach ±5mm 2 .

[0104] 3. Intelligent Conveying Control Process

[0105] (1) In the initial state, the upper valve is opened, and after the raw material falls into the pre-feeding bin, it is closed;

[0106] (2) The lower valve adjusts the initial opening according to the piezoelectric feedback value of the previous conveying;

[0107] (3) Start the motor (the rotation speed is adjustable from 30 to 60 rpm), and the material enters the conveying section;

[0108] (4) Collect the voltage signals of each piezoelectric unit in real time. When the detected voltage in the screw blade area increases, adjust the opening of the lower valve through the PID algorithm (the adjustment rate ≤ 5% / s) to maintain the conveying volume within the range of ±2% of the set value;

[0109] (5) After completing a single conveying, the system automatically switches to the anti-adhesion detection mode.

[0110] 4. Self-cleaning and anti-sticking control method

[0111] (1) After shutdown, start the self-check program to scan the residual voltage of all piezoelectric units: set the cleaning threshold voltage, and mark the units with voltage values greater than the set threshold as the adhesion areas.

[0112] (2) Apply an alternating voltage to the marked areas for 3 - 5 cycles;

[0113] (3) Monitor the voltage decay curve during the vibration process in real time. When the voltage is less than the predetermined threshold, it is determined that the cleaning is qualified;

[0114] (4) Complete the cleaning and trigger the upper valve opening instruction to complete the system reset.

[0115] 5. Power supply and control system

[0116] Adopt a three-level inverter power module with an adjustable output voltage range of ±150V and a maximum output current of 2A. The control module integrates an FPGA high-speed signal processor with a sampling frequency of 10kHz and is equipped with an industrial Ethernet communication interface. The abnormal state protection mechanism includes: overloading protection of piezoelectric units (power-off triggered when the current > 1.5A), valve jamming alarm (position feedback deviation > 3%), and vibration timeout protection (automatically terminated when the single cleaning time > 120s).

[0117] In summary, the present invention has the following advantages and functions:

[0118] I. Effects on conveying:

[0119] 1. Real-time monitoring of the rare earth accumulation amount

[0120] The piezoelectric film can real-time sense the accumulation of rare earth materials on the screw conveyor. The more the rare earth accumulates, the greater the pressure and friction force on the piezoelectric film, and the stronger the generated voltage signal. By monitoring the change of the voltage signal, the conveying state of the rare earth materials can be indirectly reflected.

[0121] 2. Automatic adjustment of the valve opening

[0122] The output voltage signal of the piezoelectric film is directly used to control the valve opening to achieve automatic adjustment. The larger the voltage signal, the smaller the valve opening, reducing the amount of rare earth entering; the smaller the voltage signal, the larger the valve opening, increasing the amount of rare earth entering. This closed-loop control method requires no manual intervention and improves the automation level of the system.

[0123] 3. Maintaining a stable conveying volume

[0124] By dynamically adjusting the valve opening, ensure that rare earth materials enter the electrolysis furnace at a stable flow rate. Prevent excessive accumulation of rare earth in the screw conveyor and avoid fluctuations in the conveying volume. Ensure that the amount of rare earth materials in the electrolysis furnace remains within the optimal range to improve the electrolysis efficiency. By stabilizing the conveying volume, avoid excessive accumulation of rare earth materials in the electrolysis furnace. Excessive accumulation of rare earth will reduce the electrolysis rate and affect the production efficiency. The real-time monitoring and valve adjustment functions of the piezoelectric film effectively avoid this problem.

[0125] 4. Reduce manual intervention and maintenance costs

[0126] The application of the piezoelectric film enables the system to operate automatically, reducing the dependence on manual monitoring and adjustment. There is no need for manual real-time adjustment of the valve opening, reducing the workload of operators. Reduce equipment failures or production accidents caused by human operation errors. By stabilizing the conveying volume and preventing material accumulation, reduce the mechanical wear and overload risk of the equipment. The screw conveyor and the electrolysis furnace operate more smoothly, reducing the failure rate. The piezoelectric film itself has high durability and can work stably for a long time.

[0127] II. Role in preventing rare earth adhesion:

[0128] 1. Real-time monitoring and automatic cleaning

[0129] The piezoelectric film can monitor the adhesion of rare earth on the screw conveyor in real time and automatically trigger the vibration cleaning function. Through the direct piezoelectric effect, the pressure generated by the adhered material is converted into a voltage signal; through the inverse piezoelectric effect, the piezoelectric film is driven to vibrate to efficiently clean the adhered material.

[0130] 2. Closed-loop control independent unit to ensure efficient operation

[0131] The system realizes closed-loop control by continuously monitoring the voltage signals of each independent unit to ensure that the cleaning process is accurate and thorough. During the vibration cleaning process, the voltage signal changes are monitored in real time. When the adhered material is cleaned, the vibration automatically stops to avoid energy waste.

[0132] 3. Improve equipment efficiency and service life

[0133] By cleaning the adhered material in a timely manner, maintain the efficient operation of the screw conveyor and extend the service life of the equipment. Prevent the increase in equipment resistance or mechanical damage caused by material accumulation. Reduce manual intervention and maintenance costs and improve the overall efficiency of the production line.

[0134] The above-disclosed are only one or more preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An intelligent drive anti - sticking conveying system for rare earth powder, characterized in that, it includes a feeding device and a screw conveyor, and the feeding device is sequentially connected to the screw conveyor; The feeding device includes a split bin, an upper valve and a lower valve. The upper valve divides the split bin into upper and lower parts, and the lower valve is arranged between the split bin and the screw conveyor; The screw conveyor includes a motor, a central shaft, screw blades and a casing. The surfaces of the central shaft, the screw blades and the inner wall of the casing are all covered with a layer of piezoelectric film, and the piezoelectric film is respectively composed of a plurality of independent units spliced together.

2. The intelligent drive anti - sticking conveying system for rare earth powder according to claim 1, characterized in that, The shape of the independent unit of the piezoelectric film on the central shaft is a parallelogram, and the shape of the independent unit of the piezoelectric film on the inner wall of the casing is set as a rectangle.

3. The intelligent drive anti - sticking conveying system for rare earth powder according to claim 2, characterized in that, The shape of the independent unit of the piezoelectric film on the screw blade is determined by the side cross - sectional shape of the screw blade, and the ring is divided into six parts to cover different areas on the side of each screw blade.

4. The intelligent drive anti - sticking conveying system for rare earth powder according to claim 3, characterized in that, At both ends of the piezoelectric film in each independent unit of the piezoelectric film are fixed ends, and there is a certain gap in the middle with the surface.

5. An intelligent drive anti-sticking conveying control method for rare earth powder, which uses the intelligent drive anti-sticking conveying system for rare earth powder described in any one of claims 1 to 4, and is characterized in that, It includes the following steps: Step 1: Control the upper valve to stack rare earth raw materials; Step 2: Receive the feeding signal or the piezoelectric feedback value of the previous conveying, adjust the opening of the lower valve, and open the upper valve for feeding; Step 3: Start the motor to enter the conveying stage; Step 4: Real - time collect the voltage signals of each independent unit of the piezoelectric film. When the detected voltage in the screw blade area becomes larger, adjust the opening of the lower valve through the PID algorithm to maintain the conveying volume within the range of set value ±2%; Step 5: After completing a single conveying, switch to the anti - sticking detection mode; Step 6: After the anti - sticking detection is completed, complete the feeding or return to Step 1 for execution.

6. The intelligent drive anti-sticking conveying control method for rare earth powder as described in claim 5, characterized in that, It includes the following steps: During the execution of the anti - sticking detection mode, there are two working modes: all - unit vibration and local - unit vibration. In the all - unit vibration mode, all the independent units of the piezoelectric film will vibrate continuously during conveying to prevent rare earth adhesion; in the local - unit vibration mode, the control module outputs an alternating voltage to the independent units of the piezoelectric film attached with rare earth to shake off the adhered rare earth.

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