What Are The Precautions For The Installation Of Magnetic Powder Brakes?

1. Magnetic powder brake manufacturer installation precautions

a. Pay great attention to avoid installation deviations during installation

(1) The upper pressing gland should be carried out after the coupling is aligned. The bolts should be evenly supported to prevent the end face of the gland from being skewed. Check the points with a feeler gauge. The error is not more than 0.05 mm.

(2) Check the fit clearance (ie, concentricity) between the gland and the outer diameter of the shaft or bushing. The circumference should be uniform. Check the tolerance of each point with a feeler gauge to be no more than 0.01 mm.

b. The amount of spring compression should be carried out according to the regulations. It is not allowed to be too large or too small, and the required error is 2.00 mm. Over the assembly, the end face is pressed and the other end face is worn. Too small will cause insufficient specific pressure and will not seal.

c. After the moving ring is installed, it can be flexibly moved on the shaft. After the moving ring is pressed against the spring, it should be able to spring back automatically.

2. Precautions when disassembling

a. Care should be taken when disassembling the mechanical seal. Do not use the hand hammer and the flat shovel to avoid damage to the sealing components. A pair of wire hooks can be made, and the sealing device is pulled out in the direction of self-supporting profit and loss into the gap of the transmission seat. If the scale is not removed, it should be cleaned before disassembly.

b. If mechanical seals are used on both ends of the pump, take care of each other during assembly and disassembly to prevent loss.

c. For the mechanical seal that has been operated, if the gland is loose to move the seal, the static and dynamic ring parts must be replaced and should not be re-tightened for continued use. Because after the turbulence, the original trajectory of the friction pair will change, and the sealing of the contact surface will be easily damaged.

Machine seal normal operation and maintenance problems

1. Preparations and precautions before starting

a. Thoroughly check the mechanical seal, and whether the attachments and pipelines are installed properly and meet the technical requirements.

b. Perform static pressure test before starting the mechanical seal to check whether the mechanical seal has leakage. If there are more leaks, you should find out the reasons and try to eliminate them. If it is still invalid, it should be disassembled and reinstalled. Generally, the static pressure test pressure is 2~3 kg/cm2.

c. Press the pump to turn the disc to check if it is light and even. If the car is struggling or not moving, check whether the assembly size is wrong and the installation is reasonable.

2. Installation and shutdown

a. Keep the sealed chamber filled with liquid before starting. For transporting the solidified medium, steam is applied to heat the sealed chamber to melt the medium. The car must be driven before starting to prevent the soft ring from breaking due to sudden start.

b. For the mechanical seal using the pump external sealing system, the oil sealing system should be activated first. Finally stop the oil sealing system after parking.

c. After the hot oil pump is stopped, the cooling water of the sealing oil chamber and the end face seal cannot be stopped immediately. When the oil temperature of the end seal is lowered to below 80 degrees, the cooling water can be stopped to avoid damage to the sealing parts.

3. Operation

a. If there is a slight leakage after the pump starts, it should be observed for a while. If the leakage is still not reduced after 4 hours of continuous operation, the pump should be stopped.

b. The operating pressure of the pump should be stable and the pressure fluctuation should be no more than 1 kg/cm 2 .

c. During the operation of the pump, evacuation should be avoided to avoid dry friction and seal damage on the sealing surface.

d. Sealing should be checked frequently. During operation, when the leakage exceeds the standard, the heavy oil is not more than 5 drops/min, and the light oil is not more than 10/min. If there is no improvement trend within 2-3 days, the pump plug should be stopped to check the sealing device.