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Safety instructions for decanter centrifuge

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Decanter centrifuge is a high-speed rotating equipment. When operating and maintaining the equipment, you must strictly abide by the operation and maintenance procedures to ensure the safe and reliable operation of the equipment. We recommend following practical rules in actual use.

 

   1. Cultivate the good habit of paying attention to safety at all times to avoid human body damage or equipment damage.

   2. Before installing, operating and maintaining the equipment, you should understand the structure of the equipment and be familiar with the contents of this manual.

   3. Safety protection measures should be taken when operating the centrifuge or working close to the centrifuge.

      4. Before disassembling wires or overhauling the centrifuge, you must cut off the motor starter, fuse box or line switching power supply. Before starting the overhaul of the equipment, you must check again and confirm that the power supply has been cut. In order to prevent accidental startup of the device and write errors.

  5. If the equipment is remotely controlled or automatically operated, a sign indicating that the equipment can be started automatically should be placed near the equipment. If the equipment starts automatically without permission, it will cause personal injury or death.

  6. ​​The wires and control components used must comply with the relevant national electrical standards, and the centrifuge and related equipment must be well grounded. Electrical work on the centrifuge and related equipment must be completed by electrical personnel who have obtained the electrical certificate.

  7. When the decanter centrifuge is being sent off, it is strictly forbidden to put hands, clothes or other things: such as tools and other objects close to rotating or moving parts and inlets and outlets to prevent casualties.

       8. Do not start the equipment before the protective device and the sight hole cover are installed. It is strictly prohibited to disassemble the protective equipment and the sight hole cover when the equipment is in operation. All protective devices and covers shall be installed after the equipment is repaired, and they shall be in good working condition. status.

     9. It is strictly forbidden to use the lifting lugs on the bearing seat or the top of the equipment shell to lift the entire centrifuge, because the lifting lugs cannot bear the heavy green load of the entire equipment. When lifting the entire equipment, the whole machine should be lifted through the corner of the machine base. Lift the lifting lugs, otherwise it will cause personal injury or death and/or damage the equipment or other equipment.

     10. Cranes, hoisting equipment, hoisting chains, wire ropes and other equipment used for hoisting must undergo strict inspections before hoisting, and confirm that these equipment are safe and feasible and have a large safety factor for the maximum equipment load required to be hoisted. Otherwise, it will cause personal injury and/or damage to this equipment or other equipment.

     11. Lifting equipment, wire ropes or chains should be fixed to prevent the equipment from tilting or sliding when lifting. Before lifting the entire equipment or large pieces from the base or the ground, you should test whether it is balanced or touched Objects, otherwise it will cause personal injury or death and damage this equipment or other equipment.

     12. Confirm that the power cord of the hoisting equipment has been disconnected and that it will not touch the upper body of the hoisting equipment or the cables near the hoisting area. These wires or cables should be cut and removed, otherwise it will cause personal injury or death and the equipment The accident was damaged.

  13. Be careful not to stretch your hands and feet under the lifting equipment or on the floor where the lifting equipment is to be placed.

  14. When it is necessary to repair any part of the centrifuge safely, it is strongly recommended that the repair be carried out by our factory or under the guidance of personnel designated by our factory, otherwise it may cause personal injury and death accidents and damage to the device or other equipment accidents.

   15. When handling lubricants, solvents or parts with a temperature higher than 40°C, be careful not to get burned.

  16. The differential lubricant cannot be overfilled, because too much lubricant will cause the differential (working) temperature to be too high and cause malfunctions. Please refer to "Lubrication".

  17. The decanter centrifuge has a large inertia, so it will continue to run for a long time after the power is cut off. You must wait for the centrifuge to completely stop rotating before proceeding to maintain it. Only 10-20 minutes after switching on the new power supply can the centrifuge completely stop rotating.

   18. If the materials processed by the centrifuge are toxic or harmful media, very effective measures must be taken to prevent the human body from inhaling or directly contacting these toxic or harmful media, liquid or gas. For example: Wear protective work clothes, glasses, gas masks, anti-berry masks and "three tight" work clothes.

  19. Only when the power supply of the centrifuge has been cut off and the rotation of the centrifuge has been completely stopped, can the machine be inspected or adjusted, otherwise it will cause personal injury or death and damage to the machine or other equipment accidents.

   20. Do not adjust any parts of the centrifuge, otherwise it will cause personal injury or death or damage to the equipment or other equipment accidents.

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How to use the Decanter centrifuge to extend Its lifespan?

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How to use the Decanter centrifuge to extend Its lifespan?

Just like people, the use of objects is inseparable from daily maintenance, especially those precision instruments, which require meticulous maintenance. A well-maintained decanter centrifuge not only works better, but also extends its service life by three to five years.

Experts warn everyone that in charge of the maintenance of the decanter centrifuge must pay attention to the following aspects which are very important to extend the lifespan of the decanter centrifuge:

   The daily maintenance of decanter centrifuges is mainly to prevent contamination, dust and oil contamination in the decanter centrifuge chamber. Before and after each experiment, clean the oil, water vapor, sample leakage and the table surface in the decanter centrifuge chamber with a clean white silk cloth. Do not open the door casually when not in use to avoid contamination. The sealing rubber ring of the door should be well sealed, and should be coated with vacuum sealing grease after a period of use. If the sealing ring is found to be aging, cracked or lose its elasticity, it should be replaced immediately. The switches, knobs and fault indicators on the control panel should be in good contact. If abnormalities and faults are found during operation, the machine should be shut down for maintenance immediately.

  Secondly, the internal systems of the decanter centrifuge should be carefully maintained and overhauled once a year. The suspicious part of the instrument should be checked and cleaned of the dirt and dust in the FI| part. When it is not used for a long time, it should be regularly energized to start the oil circulation and refrigeration system to ensure that the pipe is unblocked.

   The decanter centrifuge drive system is the heart of the centrifuge. Abnormal phenomena in any part of the high-speed motor, variable speed gear, rotating bearing and sliding bearing will affect the normal operation of the instrument.

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The importance of regular decanter centrifuge inspection

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The importance of regular decanter centrifuge inspection

 

1. Regular inspection

(1) Regularly check the gaps between the pusher plate, scraper and drum filter. The gap between the scraper and the screen should be within 5~7mm, and the axial clearance of the scraper blade from the bottom of the drum and the liquid blocking plate is about 4mm.

(2) Detect the vibration of the fuselage of decanter centrifuge every 7 to 15 days.

(3) Check whether the safety interlocking device is sensitive and easy to use every 3 months.

(4) Check and clean the oil filter every 3 months to ensure that there is no grease, water scale, and sand.

(5) Analyze the quality of lubricating oil every 3-6 months to ensure that the quality of lubricating oil meets the standard.

(6) Check and verify whether the instrument device meets the performance parameter requirements every 12 months to ensure that the instrument device is accurate, sensitive and easy to use.

2. Decanter centrifuge adjustment The timely inspection and adjustment of the decanter centrifuge before operation or during the stoppage time of the operation is an important guarantee for keeping the machine in good running condition and an important part of machine maintenance.

(1) Adjustment of the working pressure of the oil pump Adjust the relief valve to keep the output pressure of the oil pump at 1.6MPa (gauge pressure).

(2) When the working position of the scraper is adjusted when the piston rod in the scraper cylinder goes down and hits the bottom cover of the cylinder (that is, when the piston is at the bottom dead center position), the roller on the crank of the scraper device should touch the travel switch. The distance between the blade and the screen (surface screen) in the drum should be kept at 5~7mm. This distance is achieved by adjusting the travel switch on the door cover and the nut on the piston rod in the scraper cylinder. Adjust the fastening screw of the scraper blade to connect the knife holder so that the axial gap between the two ends of the blade and the bottom of the drum and the liquid blocking plate is approximately the same, about 4mm.

(3) Rotary drum loading amount The thickness of the material layer is determined by different materials, but it should not exceed 120mm.

(4) Adjustment of process duration During automatic operation, the time relay knob in the electrical console can be adjusted according to different materials and corresponding process requirements to realize the duration of each process and the total time to complete a work cycle.

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Solution to the heat problem of the main bearing of Decanter centrifuge

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The most important part of the Decanter centrifuge is the transmission part, and the bearing is an important part of the transmission part. Generally, experienced centrifuge purchasers will ask the manufacturer a series of questions about the bearing when purchasing the centrifuge.

Here we discuss the issue of bearing over-heat in centrifuges. There are several reasons for bearing heating, which should be analyzed in detail:

1. It may be due to overload or overload;

2. It may be due to heat generated by mechanical friction;

But the main problem is whether the bearing is authentic or not. Some users buy low-priced bearings for low prices, which will cause the bearings to become hot and hot, causing the bearings to burn out.

Therefore, first emphasize the need to purchase authentic bearings.

The Decanter centrifuge is a high-speed chemical and pharmaceutical equipment. High-speed bearings require good bearings. High-quality and authentic bearings can ensure the long-term normal operation of the centrifuge, and the service life can reach more than 10 years.

Second, we must pay attention to adhere to the mechanical lubrication and choose high-quality high-temperature lithium-based grease. The quality of the lithium-based grease is another main reason for bearing heat.

In addition, you must check with your detailed situation. Assuming that mechanical friction will be accompanied by noise, mechanical parts will have obvious wear, and the bearing will be loose, then it should be a bearing problem, and the bearing needs to be replaced.

Third, whether the concentricity of the centrifuge spindle and the bearing seat is accurate during the machining process. Under normal circumstances, people do not pay much attention to the concentricity. The high concentricity of the spindle tends to cause bearing heating.

Fourth, in the machining process of the spindle and the bearing seat, the tolerance is not in place, and the clearance between the bearing inner ring (outer ring) and the ball (column) is too small.

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Maintenance of Decanter Centrifuge Spindle

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Maintenance of Spindle of Decanter Centrifuge

  1. Check the wear of the main shaft journal of decanter centrifuge. If the wear depth is not too large, the wear part can be repaired by surfacing or electroplating, and then processed to the original size; if the wear depth is too large, a new shaft should be replaced.

  2. Perform flaw detection on the spindle. If there are defects such as cracks, corrosion, etc., they are not allowed to be repaired, but only replaced.

  3. Detect the straightness deviation of the spindle. If the deviation of straightness or coaxiality exceeds the allowable value, the spindle should be corrected; if the deviation is too large, it should be replaced.

  4. Check the surface quality of each machining mating surface at the journal. The surface roughness value R<6.3m, and there must be no scratches, grooves and other defects.

 

   There are two types of shafts for decanter centrifuges. One kind of shaft is slender and has greater flexibility, so it can automatically adjust the center. The other kind of shaft is thicker and shorter, and the bending deflection of the shaft itself is small, but the layered shock absorber still makes the working speed of the system above the critical speed, so the system is still a flexible system. Although it is also a flexible system, the difference between the operation of a slender flexible shaft and a more rigid shaft is that the automatic centering of the slender flexible shaft mainly realizes the rotation of the rotor around its center of mass through the bending of the shaft. The more rigid shaft is automatically centered through the flexible relative displacement of each component in the entire rotating system.

   The vibration of the decanter centrifuge is one of the important indicators to measure the performance. Vibration damping can adopt active damping and passive damping. Active vibration reduction means that the working speed of the decanter centrifuge is designed to far avoid the critical speed of the rotating system. Passive vibration damping is to separate the possible vibration from the frame and foundation with various types of vibration dampers.

   1. Design the spindle bearing seat into a flexible vibration reduction type;

   2. Flexible connection between the spindle and the motor;

   3. The entire drive system is flexibly connected to the frame.

  Rubber shock absorbers generally can meet the vibration reduction requirements of decanter centrifuges. When the structure of the shock absorber is determined, the greater the hardness of the rubber, the higher the critical speed of the system. Shock absorbers with too low hardness cannot meet the requirements and are easily damaged.