Common faults in disc centrifuges:
1 After the medium to be separated enters the centrifuge, it does not separate, and is directly discharged from the solid phase outlet, and no liquid is discharged from the light phase outlet.
2 The solid particle outlet is not discharged, and the medium is directly discharged by the light liquid out 121.
3 The vibration value is too high or the vibration interlocks to jump.
Approach:
1. The original fault of the * is due to the deformation of the PA66 gasket installed at the outlet of the sliding solid particles, which prevents the sliding piston from being closed, so that the medium is directly thrown out after entering the centrifuge. The gasket is mounted in the ring groove of the piston. When the machining error diameter is too large, the upper part is fixed in the ring groove and the lower part has a tendency to be convex. The centrifuge is in operation. The higher internal temperature makes the gasket more convex, and the gasket is subjected to the impact force when the piston slides up and down. therefore. After running for a while, the gasket is easily fatigued and layered. The sliding of the sliding piston after delamination causes the solid particle discharge 121 to be unblocked, so that the separation medium is thereby directly discharged. Treatment method: Strictly control the size of the gasket so that the diameter of the spare part is smaller than the size of the installation ring groove by 0.3 to 0.5 ram. At the same time, after replacing the new parts, let the centrifuge idle for 3h, and then raise the temperature inside the centrifuge to about 90 °C, then control the water to make the sliding piston closed 2 or 3 times, so that the gasket is evenly loaded after installation, avoiding the operation process. The occurrence of similar accidents.
2. The second type of fault is due to: 1 When the friction between the centrifuge and the motor clutch is oily or worn, the centrifuge does not reach the rated speed, so that the centrifugal force generated by the water in the drum is reduced, and the sliding piston cannot be made. The solid particle discharge 121 is turned on by moving downward. 2 The operating water pressure is too low to allow the sliding piston to move downward. 3 The sliding piston closing chamber is too dirty, so that the force of the centrifugal force to open the sliding piston after the water enters the piston is too small, so that the sliding piston cannot be opened, and the medium is directly discharged from the light liquid outlet. Treatment method: 1 Confirm by observing the speed indicator. If the rated speed is not reached, check the clutch; 2 The water pressure can be adjusted by operating the water pressure reducing valve, if it is still too low after adjustment. It can check whether the pressure regulator of the water control line and the filter are blocked. If it is blocked, it should be cleaned; 3 Clean the sliding piston closed chamber.
3, the third type of failure due to: 1 in the production process, when the content of sodium hydroxide in the hexamethylene diamine is too high. When the sliding piston is still open. Solid sodium hydroxide has filled the entire space, and when it is a little longer, very hard solid particles are concentrated inside the drum. At the time of discharge, the solids cannot be completely discharged, so that the solids are unevenly deposited on the drum, causing the centrifuge to deviate from the equilibrium state, causing high vibration or interlocking jump of the centrifuge.
Treatment method: 1 The centrifuge must be cleaned periodically according to the material condition, and the residual materials bonded in the drum of the centrifuge should be removed in time.
Secondly, by observing the turbidity of the material inlet and outlet mirrors and the quantitative analysis of the materials, the setting of the discharge time is adjusted, so that the centrifuge reaches the good solid particle discharge time. 2 test the reason. The centrifuge drum is mounted on a vertical flexible shaft. The vertical flexible shaft is fixed by an upper bearing seat with a spring (elastic device) and a lower bearing seat with a swing bearing and a spring. The preload of the spring is applied to the entire system. The elasticity has an effect. Vibration can be reduced by using the same stiffness springs with the same preload. Therefore, it is necessary to check the preload force of the springs on a regular basis. When it is found that individual springs have problems, they must be replaced in a complete group. 3 Frequent opening and parking has aggravated the wear of the lower transmission worm gear and worm, so that the vibration value is too high due to the excessive clearance. Therefore, it is necessary to reduce the number of open stops as much as possible and keep the centrifuge running smoothly for a long period of time.
1 After the medium to be separated enters the centrifuge, it does not separate, and is directly discharged from the solid phase outlet, and no liquid is discharged from the light phase outlet.
2 The solid particle outlet is not discharged, and the medium is directly discharged by the light liquid out 121.
3 The vibration value is too high or the vibration interlocks to jump.
Approach:
1. The original fault of the * is due to the deformation of the PA66 gasket installed at the outlet of the sliding solid particles, which prevents the sliding piston from being closed, so that the medium is directly thrown out after entering the centrifuge. The gasket is mounted in the ring groove of the piston. When the machining error diameter is too large, the upper part is fixed in the ring groove and the lower part has a tendency to be convex. The centrifuge is in operation. The higher internal temperature makes the gasket more convex, and the gasket is subjected to the impact force when the piston slides up and down. therefore. After running for a while, the gasket is easily fatigued and layered. The sliding of the sliding piston after delamination causes the solid particle discharge 121 to be unblocked, so that the separation medium is thereby directly discharged. Treatment method: Strictly control the size of the gasket so that the diameter of the spare part is smaller than the size of the installation ring groove by 0.3 to 0.5 ram. At the same time, after replacing the new parts, let the centrifuge idle for 3h, and then raise the temperature inside the centrifuge to about 90 °C, then control the water to make the sliding piston closed 2 or 3 times, so that the gasket is evenly loaded after installation, avoiding the operation process. The occurrence of similar accidents.
2. The second type of fault is due to: 1 When the friction between the centrifuge and the motor clutch is oily or worn, the centrifuge does not reach the rated speed, so that the centrifugal force generated by the water in the drum is reduced, and the sliding piston cannot be made. The solid particle discharge 121 is turned on by moving downward. 2 The operating water pressure is too low to allow the sliding piston to move downward. 3 The sliding piston closing chamber is too dirty, so that the force of the centrifugal force to open the sliding piston after the water enters the piston is too small, so that the sliding piston cannot be opened, and the medium is directly discharged from the light liquid outlet. Treatment method: 1 Confirm by observing the speed indicator. If the rated speed is not reached, check the clutch; 2 The water pressure can be adjusted by operating the water pressure reducing valve, if it is still too low after adjustment. It can check whether the pressure regulator of the water control line and the filter are blocked. If it is blocked, it should be cleaned; 3 Clean the sliding piston closed chamber.
3, the third type of failure due to: 1 in the production process, when the content of sodium hydroxide in the hexamethylene diamine is too high. When the sliding piston is still open. Solid sodium hydroxide has filled the entire space, and when it is a little longer, very hard solid particles are concentrated inside the drum. At the time of discharge, the solids cannot be completely discharged, so that the solids are unevenly deposited on the drum, causing the centrifuge to deviate from the equilibrium state, causing high vibration or interlocking jump of the centrifuge.
Treatment method: 1 The centrifuge must be cleaned periodically according to the material condition, and the residual materials bonded in the drum of the centrifuge should be removed in time.
Secondly, by observing the turbidity of the material inlet and outlet mirrors and the quantitative analysis of the materials, the setting of the discharge time is adjusted, so that the centrifuge reaches the good solid particle discharge time. 2 test the reason. The centrifuge drum is mounted on a vertical flexible shaft. The vertical flexible shaft is fixed by an upper bearing seat with a spring (elastic device) and a lower bearing seat with a swing bearing and a spring. The preload of the spring is applied to the entire system. The elasticity has an effect. Vibration can be reduced by using the same stiffness springs with the same preload. Therefore, it is necessary to check the preload force of the springs on a regular basis. When it is found that individual springs have problems, they must be replaced in a complete group. 3 Frequent opening and parking has aggravated the wear of the lower transmission worm gear and worm, so that the vibration value is too high due to the excessive clearance. Therefore, it is necessary to reduce the number of open stops as much as possible and keep the centrifuge running smoothly for a long period of time.
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