Vertical Screw Discharge Centrifuge is a kind of dewatering equipment that uses centrifugal force generated by mechanical rotation to separate solid-liquid mixtures. The motor drives the differential through the triangle belt, and the differential is equipped with two pairs of helical cylindrical gears with a difference of 1 tooth, which mesh with the gears mounted on the outer shaft and on the mandrel respectively, so as to keep the screen basket and the spiral discharge rotor rotating in the same direction with an appropriate difference in rotational speed.
The coal slurry passes through the inlet and enters the space between the screen basket and the screw discharge rotor via the fabric cone. Under the action of centrifugal force, water and small coal slurry particles through the material layer, through the screen, along the upper cover into the upper part of the machine base of the water collection tank, and then discharged out of the machine through the liquid discharge pipe located on both sides of the machine base; coal particles are kept in the inner side of the screen basket, because of a certain rotational speed difference between the spiral discharging rotor and the screen basket, the spiral discharging rotor will be scraped from the coal particles on the screen mesh, and will be pushed to the bottom of the screen basket, so as to unload the dehydrated coal slurry to the lower side of the machine receiving materials. The dewatered coal slurry is unloaded into the collecting hopper under the machine, and this dewatering process is carried out continuously.
一.Installation points of vertical screw discharge centrifuge
1.Inspection before installation
Before installing the vertical screw discharging centrifuge, careful inspection work must be carried out. First of all, it is necessary to check whether the size of the footing of the installation location is exactly in line with the drawings, and any deviation may affect the stability and normal operation of the equipment. At the same time, it is also necessary to use a levelling instrument to check the level of the installation site. Centrifuge vibration damper lower positioning surface level error can not exceed 2 ‰, once the level of error is found, should be promptly adjusted using the pad to ensure that the level of the installation base. Only before the installation of these checks, in order to lay a good foundation for the subsequent installation process.
2.Installation process
The centrifuge should be installed as a whole as far as possible, the lifting position should be selected in the appropriate position of the seat and motor seat, do not use the two lugs on the cover to lift the whole machine. If the situation does not allow the need to disassemble the installation, should be in a specific order from the seat of the parts: first remove the belt, followed by the lubrication pipeline, oil tank, motor and bracket and so on. When installing, install the main part first, then install the removed parts in the reverse order of disassembly. This ensures the accuracy and safety of the installation process and avoids damage to the equipment or operational failure due to improper installation order.
3.Requirements after installation
After the installation is completed, there are some important requirements to be met. Firstly, the foundation power coefficient is calculated according to 2.0, which is to ensure that the equipment can withstand all kinds of dynamic loads during operation. Secondly, a section of riser should be added before feeding, and the riser should be aligned with the axis of the centrifuge, so as to ensure uniform feeding and avoid affecting the separation effect due to uneven feeding. Finally, after the centrifuge is assembled, the specified lubricant should be injected into the oil tank according to the requirements of the manual to ensure the normal operation of the equipment lubrication system.
二.Operational Precautions
1.Check before starting
Before starting the vertical screw discharging centrifuge, a comprehensive and detailed inspection must be carried out. First of all, check whether the overload protection device is in normal working condition, which is to ensure that the equipment in the event of abnormalities can be stopped in time to avoid damage to the motor and other key components of the important guarantee. Then check whether the fastening bolts are loose, any loose bolts may cause serious safety accidents during the operation of the equipment, affecting the stability of the equipment and the separation effect. It is also necessary to check whether the drum can rotate normally, to ensure that the drum can rotate at a stable speed after starting to achieve the function of solid-liquid separation. At the same time, check whether there is any friction between the moving parts and the static parts, if there is friction it may cause damage to the parts and affect the normal operation of the equipment.
2.Prevent vibration measures
In order to prevent centrifuge vibration caused by uneven distribution of sediment in the drum when it is just driven, an auxiliary liquid (water or other liquid) can be added to the drum before adding the suspension. The temperature of the auxiliary liquid should be the same as the temperature of the suspension, so as to avoid the adverse effects caused by the temperature difference. When the drum is full of auxiliary liquid, then gradually add the suspension, so that the load of the centrifuge is gradually increased to the normal load. For example, in practice, when dealing with suspensions with high densities of solid and liquid phases, the solids are easy to settle, and the method of adding auxiliary liquid is particularly important at this time. In this way, the centrifuge vibration caused by uneven distribution of sediment can be effectively reduced to ensure smooth operation of the equipment.
3.To prevent clogging method
When operating the vertical screw discharge centrifuge, the feed volume and suspension concentration should be strictly controlled. When the feed amount is too large or the concentration of suspension is too high, it is possible that the spiral discharge sedimentation centrifuge is blocked and forced to stop. To avoid this situation, the feed rate and suspension concentration should be reasonably controlled according to the specifications and performance of the equipment. If clogging occurs, the following methods can be used to eliminate. Firstly, introduce the flushing liquid from the feeding pipe, and at the same time, slowly rotate the drum by hand along the rotating direction of the drum, so that the slag blocked in the drum is gradually discharged from the slag discharge port of the drum. In general, this method can effectively solve the clogging problem. If the clogging is more serious and the above method does not work, it is necessary to dismantle the centrifuge, take out the feeding screw from the drum, and then remove the clogging.
4.Protective measures
In order to ensure the safe operation of the machine, a series of protective measures need to be taken. On the one hand, the use of overcurrent protection, when the centrifuge is blocked and seriously overloaded, it will cause a sudden increase in motor current, overcurrent relay will cut off the host power supply to protect the motor and the work of the host. The basic principle is to use the overcurrent relay, according to the maximum load capacity of the machine, give the overcurrent relay a given value in advance, in this given value range centrifuge to ensure good operation. When the process conditions change and the load suddenly increases, the overcurrent relay is cut off and the main machine stops running, thus ensuring the safety of the centrifuge. On the other hand, the use of hydraulic coupling protection mode can slow down the impact and vibration in the transmission system, which can greatly cut down the dynamic stress of the working mechanism, reduce the degree of fatigue, so that the transmission is smooth, which greatly extends the service life of the motor and the working machine. For example, in some large-scale industrial production, the simultaneous use of these two protection methods can effectively improve the reliability and safety of the centrifuge, reduce equipment failure and maintenance costs.
As an important solid-liquid separation equipment, vertical screw discharging centrifuge plays a key role in many industries. Correct installation, commissioning, operation and maintenance are essential to ensure its efficient and stable operation.
In terms of installation, strictly follow the steps of inspection and operation to ensure that the equipment is based on a solid foundation, the components are connected correctly and well lubricated. In the commissioning process, carefully check the installation and then carry out empty vehicle test run, load test and other steps to ensure that the equipment can operate normally under different conditions. During operation, pay attention to the comprehensive inspection before starting, take measures to prevent vibration and blockage, and start, run and stop the machine in strict accordance with the correct sequence. Meanwhile, to ensure the safe operation of the machine, measures such as overcurrent protection and hydraulic coupling protection are taken to improve the reliability and safety of the equipment.
With the continuous progress of science and technology and the continuous development of industry, vertical screw discharge centrifuge has a broad development prospect in the future. In terms of technology, it will continue to develop in the direction of intelligence and automation. Through the introduction of advanced sensor technology and control systems, real-time monitoring and automatic adjustment of the operating state of the equipment can be achieved, so as to improve the separation efficiency and precision, and reduce the cost and labour intensity of manual operation. For example, intelligent sensors are used to monitor the rotational speed of the drum, vibration conditions and oil temperature and other parameters, so that an automatic alarm is given and corresponding protective measures are taken when an abnormality occurs. In terms of energy saving and environmental protection, the design will be further optimised to reduce energy consumption and minimise the impact on the environment. New energy-saving motors and high-efficiency transmission systems are adopted to improve the efficiency of energy utilisation. Meanwhile, the recycling of separated solids and liquids will be strengthened to reduce resource waste and environmental pollution.
In the field of application, with the increasing requirements for solid-liquid separation in various industries, the application range of vertical screw discharge centrifuge will continue to expand. In addition to the traditional chemical, pharmaceutical, food and other industries, in environmental protection, new energy and other emerging fields will also play an important role. For example, in the field of sewage treatment, vertical screw discharge centrifuge can efficiently separate solid particles and liquids in sewage, providing strong support for the recycling of water resources.
In short, the vertical screw discharge centrifuge will continue to innovate and develop in the future, providing more efficient and reliable solid-liquid separation solutions for the production and development of various industries.
