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25.04.2024  |  449x
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Tips for effective screw conveyor maintenance

Proper maintenance of a screw conveyor is essential to ensure its efficient operation, prolong its lifespan, and avoid costly repairs or replacements. How to check and maintain effectively.
A screw conveyor, also known as an auger conveyor, is a machine that uses a helical screw to move bulk products from one point to another. Proper maintenance of a screw conveyor is essential to ensure its efficient operation, prolong its lifespan, and avoid costly repairs or replacements.

Sensitive points in a screw conveyor

  1. Bearings: These parts allow the screw to rotate without friction. It’s crucial to check them regularly for signs of wear or damage.
  2. Helical Screw: This is the main part of the conveyor. It should be inspected for deformations or excessive wear.
  3. Tube or Trough: This is the container where the screw is located. It should be free of obstructions and damage.
  4. Seals: They prevent material from escaping and protect against the entry of contaminants. They should be checked and replaced if necessary.

Parts to replace periodically

  1. Drive Shaft Bearings - Inspection and greasing; Frequency: Every 1000 hours or every three months. Regular monitoring of the service temperature of the screw conveyor bearings is essential, ensuring it does not exceed 50ºC in normal ambient temperature. Regular greasing of the bearings is recommended, following the manufacturer’s instructions for the lubricant used. This maintenance is crucial to ensure the durability and proper functioning of the screw conveyor, thus ensuring its operational efficiency over time.
  2. Motor-Reducer Group - Greasing; Frequency: From 15,000 to 30,000 hours or every 5 years (depending on working conditions). In general, the motor reducer requires little maintenance, although this can vary depending on operational conditions and oil temperature.
    Important considerations for storage before startup include protection from weather and moisture, and placement on pallets. During installation, ensure firm anchoring to prevent vibrations, install hydraulic couplings or torque limiters in cases of shocks or overloads, and protect seals during painting to avoid rubber damage.
    Additionally, follow other recommendations like machining parts with ISO H7 tolerance, using appropriate extractors for assembly, keeping contact surfaces clean and protected against oxidation, and applying protections in outdoor installations to prevent damage from atmospheric agents.
    For the motor, it’s necessary to keep the fan guard and casing clean for proper cooling. Important considerations: a) Check the oil level and place the deaeration plug; b) During maintenance and cleaning, ensure that the machine is disconnected and locked.
  3. Transmission (sprockets and chain) - Greasing; Frequency: Every 1,000 hours or every three months. For proper functioning of the drive mechanism, the sprockets and chain must always be greased with consistent grease (every 100 hours of operation or weekly), and special attention should be paid to ensuring the chain is perfectly tensioned. This tensioning should be done periodically, approximately every 100 hours of operation. Tensioning is achieved by moving the motor reducer on the guides, which are finally placed on the motor reducer’s base or support plate. Once the chain tensioning is done, the perfect feeding of the sprockets should be checked.
  4. Stuffing Box - Check; Greasing on assembly and replacement of the stuffing; Frequency: Every 1000 hours or every three months, and on assembly and replacement of the stuffing. After the first hour of operation, it is essential to perform a tightening adjustment. This process involves tightening the bolts of the stuffing box, which is crucial to ensure an effective seal and prevent leaks in this area. If the tightening reaches its maximum limit, it will be necessary to replace the stuffing. To carry out this replacement, simply loosen the tightening bolts and change the stuffing strips. It is important that, during this operation, the screw conveyor is empty and that both the shaft area and the stuffing housing are completely clean. This ensures a proper adaptation of the new stuffing.
  5. Seals - Should be replaced at least once a year or when wear is observed.
  6. Lubricants - It is essential to change and refill lubricants according to the manufacturer’s recommendations.

Possible failures or breakdowns

  1. Jams: Can be caused by an overload of material or by a damaged screw.
  2. Excessive Wear: Generally due to lack of lubrication or the presence of abrasive materials.
  3. Unusual Noise: May indicate problems with the bearings or the motor.
  4. Material Leaks: Generally related to damaged seals or a broken tube.

Effective preventive maintenance

  1. Regular Inspection: Perform visual and auditory inspections regularly to detect signs of wear or damage.
  2. Cleaning: Keep the conveyor clean, removing any residue or accumulation of material.
  3. Lubrication: Ensure that all moving parts are adequately lubricated.
  4. Replacement of Parts: Change worn parts before they completely fail.
  5. Training: Ensure that personnel are adequately trained on how to operate and maintain the screw conveyor.

Company information

Sinfimasa
Sinfimasa
Experience and Commitment The main business of Sinfines y Maquinaria S.A. (Sinfimasa) is to understand the customer and design and manufacture conveyors according to project requirements and the specifications of the solid material to be handled. At our facilities in Guissona (Spain), we have our own engineering department with over 35 years’ experience, where we design machines that meet our customers’ technical specifications and make our commitment to their engineering project. We offer solutions for conveying and lifting bulk solids with uncompromising quality and precision, and we ensure equipment reliability in every situation in the processing plant. Safe, Robust, Reliable In our production plant we manufacture products with all types of finishes as required: pickled and passivated, electro-polished, lacquered, sandblasted and food-grade, etc. We work with different materials such as carbon steel, stainless steel and anti-wear steel. We use high quality and universally available components such as SEW gearmotors or SKF bearings. Our suppliers are also key to our success and we make a commitment to them. We have a test bench where, based on product samples from our customers, we research the best solution for the requirements of each project. We are committed to our customers and engineering companies to offer machines with guaranteed reliability. Sinfimasa has welding procedures and welders approved according to ASME Section IX (QW-484). We use an automated welding system to ensure that the entire length of the conveyors are welded evenly and are free from voids. At Sinfimasa we are rigorous and demanding, with numerous references in several countries on all five continents as our guarantee. Please ask us for more information as you require. Consult us about your project on no obligation. We will make you a reliable technical proposal that is 100% adapted to your requirements.
Last update: 20.03.2023
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