JB/T 6119-1992 TCL sedimentation filter centrifuge operating procedures
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6119--92
Instructions for use of TCL sedimentation filter centrifuge
Published on June 9, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Instructions for use of TCL sedimentation filter centrifuge
1 Subject content and scope of application
This standard specifies the installation requirements, operating procedures and maintenance methods of TCL series sedimentation filter centrifuges. This standard applies to TCL series sedimentation filter centrifuge 2 Reference standards
GB7324
Universal lithium-based grease
ZBJ17003 Selection method for industrial gear lubricants JB/T6118
3 Installation
TCL sedimentation filter centrifuge
JB/T611992
3.1 The centrifuge can be installed as a whole or in parts according to the installation location and its specific conditions. When installing in parts, it can be divided into the following major parts: base, hub, transmission device and differential.
3.2 The dynamic coefficient of the concrete or steel structure foundation of the centrifuge shall not be less than 3. 3.3 In order to facilitate the installation and maintenance of the centrifuge, a lifting device should be installed above the centrifuge, and there should be enough maintenance space and passages around it. 3.4 Before the centrifuge is in place, the foundation level should be strictly checked, and concrete or iron sand should be evenly filled in the base according to the drawing to make the shock-absorbing foundation basically balanced.
3.5 All pipes connected to the centrifuge should be connected flexibly. 4 No-load test run
4.1 Before using the centrifuge, especially when it is idle for some time, the lubrication system needs to be fully checked, and the correct lubricant should be added to each lubrication point. The grease should meet the requirements of GB7324 ZL-3, and the lubricating oil should meet the requirements of ZBJ17003 N150. 4.2
Check the position of the vibration isolation rubber pad and each protective cover to confirm that there is no collision and friction. 4.3
Check whether the cooling water of the cooler is unobstructed. 4.4 Check whether each interlocking device is correct and reliable. Including: torque sensing system, travel switch, pressure controller, overheating protection switch. 4.5 Check whether the discharge pipeline is unobstructed.
4.6 Start the lubrication motor, check whether the circulating oil flows into the lubrication point, observe the pressure gauge reading, the normal oil pressure is 0.2~0.25MPa4.7 After the above inspection is completed, start the main motor, confirm that the rotation direction is the same as the rotation direction marked on the outer cover, and run the empty car for 15 minutes. The no-load current is less than 120A:
4.8 The no-load test run should be continuously operated for more than 4 hours, and the noise, bearing temperature rise and vibration should be observed and measured. 5 Operation and adjustment during load operation
5.1 The operator must understand the basic structure and working principle of the centrifuge, and be trained. Only qualified persons can operate the machine. 5.2 The operation site should have the "Operation Procedures" formulated by the user unit. 5.3 The operation of the centrifuge is carried out according to the following procedures: First, start the lubrication motor, wait for the oil pressure to stabilize, then start the main motor, the starting time is not less than 70 to 90 seconds, when the main engine reaches the normal speed, open the feed pump (valve), start feeding at a low rate, and gradually increase to meet the processing volume requirements; when the lubricating oil temperature rises, open the cooling water to reduce the oil temperature, the cooling water volume is 1.5 to 3.6 m/h JB/T611992
5.4 Usually the centrifuge should use the lowest speed first, if it can meet the process requirements, from the perspective of power consumption and maintenance, this is the best 5.5 Feeding control
5.5.1 The design of the feeding system should ensure that the feeding is uniform and continuous, and the feeding conditions should meet the requirements of JB/T6118. 5.5.2 The feeding system should have a device to prevent materials larger than 6 mm from entering the centrifuge. 5.5.3 The feeding amount can be controlled according to the torque value and the operating current. 5.5.4 It is strictly forbidden to start the centrifuge with material
5.6 When the centrifuge is stopped, first stop feeding and start the flushing water to flush the feeding chamber and the filter screen. The flushing water pressure of the filter screen is 0.5MPa, the flow rate is 10~15m/h, and it takes about 10 minutes. Then stop the main motor, and stop the lubrication motor after the centrifuge stops. 5.7 Adjustment of process parameters
After the centrifuge is running, after 10~15 minutes of stable operation, the dehydrated dry material, overflow liquid and filtrate at the screen can be obtained respectively. Samples can be taken for analysis to see if they meet the process design requirements. Otherwise, adjustments can be made according to the following instructions. 5.7.1 Improvement of dehydration effect
5.7.1.1 Replace the driving pulley of the transmission system (from small to large) to increase the speed and use the method of increasing centrifugal force to reduce the moisture content of the product. However, it should be noted that some materials are brittle materials. When the speed is increased, a large amount of materials will be over-crushed, the content of fine-grained materials will increase, and the dehydration effect will be affected; some materials can obtain low-moisture products with a lower speed. The best centrifugal force should be determined according to the properties of the material. 5.7.1.2 When the speed changes, the effect on the moisture content of the product is not obvious for some materials. The length of the non-filtered part of the cone section can be changed by reducing the liquid surface depth, that is, the length of the dehydration section can be increased, so that more liquid can be removed before reaching the screen surface. But it is also necessary to pay attention to whether the overflow solid content meets the required indicators, and both should be taken into account to find the best position. 5.7.1.3 The dehydration effect of the centrifuge depends largely on the composition of solid particles in the slurry. The content of -0.044mm materials should be minimized. The moisture content of the product increases with the increase of -0.044mm material content. Generally, the content of -0.044mm material should be less than 20%. 5.7.2 Change the overflow solid content
5.7.2.1 Increasing the rotation speed and increasing the centrifugal strength can separate finer particles, clarify the liquid, and reduce the overflow solid content. However, the nature of the material must be considered. The material should not be over-crushed due to the increase in rotation speed. It should be a high speed (within the allowable range) compatible with the product characteristics and performance requirements to obtain the best clarity. 5.7.2.2 Adjusting the overflow weir and increasing the liquid level depth can reduce the overflow solid content. 5.7.2.3 Under the condition that other conditions remain unchanged, reducing the feed amount can increase the retention time of the slurry in the rotor, allowing the material to fully settle and improve the clarity of the overflow liquid.
5.8 Analysis and troubleshooting of faults
5.8.1 If the filtrate is reduced or interrupted, it means that the screen gap is blocked and can be cleaned by spraying water; if spraying water cannot solve the problem, it means that there is a thick layer of material in the screen, which blocks the screen gap and cannot be drained. The reason for the formation of thick material layer is that the spiral blades are worn and the gap between the blades and the cylinder increases. At this time, the machine needs to be disassembled for repair. www.bzxz.net
5.8.2 The power consumption increases, but the differential torque does not increase. It is usually due to resistance friction on the outside of the cylinder. It may be due to the accumulation of materials in the discharge cavity that have not been discharged and rubbed with the cylinder. The outer cover should be disassembled to check the friction marks for correct treatment; it may also be that the discharge pipe is blocked, causing the liquid level to rise and rub against the outer wall of the cylinder. The pipe should be cleaned in time. 5.8.3 The safety pin is cut off, usually due to sudden overload, or due to the following reasons: the differential is not aligned, causing the shearing device to move, causing fatigue fracture of the shear pin; long-term fluctuating loads cause fatigue fracture of the shear pin; the bearing gear or spline in the differential is broken; the thrust bearing is worn or broken. The damaged parts should be handled or replaced according to different situations. 5.8.4 The vibration of the centrifuge increases because some parts are worn or deformed. The main parts are: deformation of the screw conveyor trunnion; wear of the support sleeve; deformation of the cylinder trunnion. The above reasons should be stopped for repair or replacement of parts. If the vibration is caused by the weight of the material bonding, the vibration can be eliminated when it is thoroughly cleaned.
5.8.5 The fuse plug of the hydraulic coupling melts, mainly because the uneven feeding causes the load of the coupling to change, and the oil temperature rises to melt the fuse plug; it may also be due to insufficient refueling and insufficient transmission power. The correct medium oil should be added according to its manual. 6 Maintenance
JB/T611992
During the operation of the centrifuge, some parts will inevitably be damaged and require repair. Correct and timely maintenance is the guarantee of normal operation of the centrifuge. General repairs can be carried out on site according to the following instructions. 6.1 When the centrifuge is overloaded and the shear pin is cut off, the cylinder and the spiral rotor rotate at the same speed and gradually stop. At this time, a strong blockage will occur in the cylinder. The correct way to deal with it is to install a new shear pin. Before re-working the machine, the drum should be placed manually to remove the deposits in the machine. It is strictly forbidden to start the machine with materials.
6.2 The lubrication system should be checked frequently to see if the oil pressure is within the required range and whether the pressure controller can work normally. The oil filter element should be cleaned or replaced regularly to avoid blockage.
6.3 Add lubricant regularly. Dry oil lubrication points: spiral bushing, seal ring, transmission bearing should be lubricated every 350 hours; thin oil lubrication points: main bearing and differential, lubricating oil should be replaced every 1050 hours. 6.4 The working environment and maintenance directly affect the life of the belt, and it should be replaced regularly according to the situation. When replacing, it should be noted that the axis of the transmission shaft should be parallel to the axis of the main machine, which can be checked by pulling the wire on the end face of the pulley. 6.5 When the centrifuge is running, the screen will be damaged due to various reasons. The outer cover should be opened in time to find the damaged part. The repair method is: use a thin steel plate to weld the circular (square) hole of the damaged screen, and at the same time, weld the same thin steel plate at the circular (square) hole of the undamaged screen 180° apart to maintain balance. A small current should be used during welding to avoid generating high heat and causing the screen inside the cylinder to fall off. Additional notes:
This standard is proposed and managed by the Luoyang Mining Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Luoyang Mining Machinery Factory. The main drafter of this standard is Chen Haiyang.
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