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旋轉(zhuǎn)供料器，又稱旋轉(zhuǎn)閥或星型給料器
Rotary feeder, also known as rotary valve or star feeder, is a core equipment in pneumatic conveying, powder processing and other processes. It achieves material quantitative supply and system sealing through the rotation of the impeller, but in the initial use stage, the following typical problems are prone to occur due to equipment running in, parameter adaptation, or insufficient operating experience.
一、供料不連續(xù)與流量波動
1
旋轉(zhuǎn)供料器啟動初期
During the initial start-up of the rotary feeder, intermittent feeding or instantaneous flow overshoot are common phenomena. Possible reasons may include:
轉(zhuǎn)速控制失當(dāng)：驅(qū)動電機(jī)未采用變頻調(diào)速
Improper speed control: The drive motor did not adopt variable frequency speed regulation, or the PID parameters were not optimized according to the material characteristics, resulting in fluctuations in impeller speed. For example, when transporting lightweight plastic particles, if the acceleration time is too short, the material is prone to accumulate at the outlet due to inertia, causing pulse feeding.
物料特性不匹配：粘性物料易附著葉輪表面，造成實(shí)際排料量小于理論值
Mismatch of material characteristics: Viscous materials are prone to adhere to the surface of the impeller, causing the actual discharge volume to be less than the theoretical value; Materials with excessive fluidity, such as ultrafine powders, may leak due to gas backflow. During the initial debugging of a certain food enterprise, the deviation of the feeding amount reached 15% due to the failure to consider the electrostatic adsorption characteristics of milk powder.
解決方案：通過激光位移傳感器監(jiān)測葉輪填充滿度
Solution: Monitor the filling degree of the impeller through a laser displacement sensor, and establish a mathematical model of speed flow rate based on the material's angle of repose data. At the same time, a vibration assisted flow device is installed at the feed inlet to disrupt the tendency of material bridging.
二、密封失效與氣體泄漏
2
旋轉(zhuǎn)供料器的動靜密封結(jié)構(gòu)若設(shè)計或維護(hù)不當(dāng)
If the dynamic and static sealing structure of the rotary feeder is not designed or maintained properly, it can easily cause the following problems:
端面密封磨損：機(jī)械密封端面因顆粒嵌入或潤滑不足，在高壓差工況下快速磨損
End face seal wear: The mechanical seal end face wears rapidly under high pressure differential conditions due to particle embedding or insufficient lubrication. After 72 hours of operation, a 0.3mm groove appeared on the sealing surface of a certain chemical project, resulting in a decrease in system pressure.
殼體間隙泄漏：葉輪與殼體間隙設(shè)計值與物料粒徑不匹配
Shell clearance leakage: The design value of the clearance between the impeller and the shell does not match the particle size of the material. If the gap is too small, hard particles (such as quartz sand) are prone to get stuck and cause equipment to jam; Excessive gap can lead to gas backflow.
應(yīng)對措施：采用雙端面機(jī)械密封并配置PLAN23沖洗方案，利用氮?dú)飧綦x密封腔
Response measures: Adopt double end mechanical seals and configure PLAN23 flushing scheme, and use nitrogen to isolate the sealing chamber. For materials containing large particles, a combination structure of lip seal and inflatable seal is used, and the sealing pressure is adjusted by real-time monitoring of the leakage rate (<1×10?3Pa·m3/s).
三
3、 Abnormal noise and vibration
設(shè)備空載或輕載運(yùn)行時產(chǎn)生的異常聲振信號
The abnormal sound and vibration signals generated by equipment during no-load or light load operation often indicate potential faults:
軸承故障：因潤滑脂選型錯誤（如高溫工況使用鋰基脂）或安裝游隙過大
，軸承保持架在運(yùn)行200小時后即出現(xiàn)碎裂征兆，特征頻譜顯示保持架故障頻率（BPF）達(dá)380Hz。Bearing failure: Due to incorrect selection of lubricating grease (such as using lithium based grease under high temperature conditions) or excessive installation clearance, the bearing cage shows signs of fracture after 200 hours of operation, and the characteristic spectrum shows a cage failure frequency (BPF) of 380Hz.
動平衡缺陷：葉輪材質(zhì)不均或焊接殘余應(yīng)力導(dǎo)致重心偏移
。某水泥生產(chǎn)線調(diào)試時，1階振動速度達(dá)8.5mm/s（ISO10816-3標(biāo)準(zhǔn)限值4.5mm/s）Dynamic balance defect: Uneven impeller material or residual welding stress causing the center of gravity to shift. During the debugging of a cement production line, the first-order vibration speed reached 8.5mm/s (ISO10816-3 standard limit of 4.5mm/s), which was reduced to 2.1mm/s after on-site dynamic balance correction.
減振方案：在驅(qū)動電機(jī)與供料器間增設(shè)彈性柱銷聯(lián)軸器，并優(yōu)化基礎(chǔ)隔振器剛度
Vibration reduction plan: Install an elastic pin coupling between the drive motor and the feeder, and optimize the stiffness of the foundation isolator to avoid the natural frequency of the system within ± 20% of the working speed range.
四、卡料與堵塞
4
物料在供料器內(nèi)部滯留或架橋
Material retention or bridging inside the feeder is a common problem during initial operation:
物料架橋：濕粘性物料（如淀粉）在葉輪槽內(nèi)形成團(tuán)塊
Material bridging: Wet and viscous materials (such as starch) form clumps in the impeller groove, and a heating jacket needs to be installed to maintain the shell temperature at least 5 ℃ above the material dew point.
異物侵入：未設(shè)置除鐵器導(dǎo)致金屬雜質(zhì)卡入葉輪與殼體間隙
Foreign object intrusion: Failure to install an iron remover resulted in metal impurities getting stuck in the gap between the impeller and the housing. A certain feed factory failed to install permanent magnet rollers, resulting in equipment jamming with 8mm diameter bolts, which took 6 hours to repair.
預(yù)防措施：在進(jìn)料口加裝振動篩（孔徑≤最小物料粒徑的0.8倍）
Preventive measures: Install a vibrating screen (aperture ≤ 0.8 times the minimum material particle size) at the feed inlet, and set up a pressure sensor to monitor the pressure difference inside and outside the shell. When the pressure difference exceeds 0.5 bar, automatic reverse pulse blowing is initiated.
五、電氣控制邏輯缺陷
5
自動化系統(tǒng)中
In automation systems, the mismatch between control programs and equipment characteristics can easily lead to cascading failures:
啟停順序錯誤：未遵循"先開風(fēng)機(jī)后啟動供料器"的順序，導(dǎo)致管道壓力瞬間超限觸發(fā)安全閥
Start stop sequence error: Failure to follow the sequence of "start the fan first and then start the feeder" resulted in the pipeline pressure instantly exceeding the limit and triggering the safety valve.
聯(lián)鎖保護(hù)缺失：未將供料器電流信號納入DCS監(jiān)控
Lack of interlock protection: The feeder current signal was not included in the DCS monitoring, which resulted in the inability to stop the machine in a timely manner when the impeller got stuck, causing pitting corrosion of the gearbox gears.
優(yōu)化方向：采用模糊控制算法
Optimization direction: Adopting fuzzy control algorithm to adjust the coupling relationship between impeller speed and fan frequency in real time according to material flow rate, so as to shorten the system response time.
旋轉(zhuǎn)供料器的初始穩(wěn)定運(yùn)行
The initial stable operation of the rotary feeder requires the construction of a collaborative support system in three dimensions: mechanical, process, and control. By introducing online monitoring technologies such as vibration spectrum analysis and temperature field scanning, as well as digital twin models, predictive maintenance of faults can be achieved. In the future, with the application of intelligent materials (such as shape memory alloy seals) and edge computing technology, the adaptive ability of the feeder will be significantly improved, further reducing the technical risk in the initial commissioning stage.
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