The grinding inspection shall be carried out until the color is uniform and consistent with the naked eye. This step is very important and must be done in place. The grinding work must be treated strictly and kept clean. After the first rough grinding, it should be cleaned before entering the next level of grinding. There are many grades of grinding carborundum, and the grinding process can be selected according to the size of the ball, geometric changes and customer requirements. The grinding work is mainly wet grinding. The dry grinding is difficult to ensure the geometric accuracy because of the harsh working environment requirements of the micro powder, which is easy to agglomerate and causes uneven removal. Therefore, it is not recommended to adopt it at present. The removal mechanism of the grinding work is to roll, crush and scratch the surface with sand particles of a certain size that are larger than the hardness of the workpiece and with acute angles and irregular myopia. To make micro cutting movement. The cutting mechanism with many micro crushing points is characterized by small cutting stress, large heat dissipation area, small thermal deformation, etc., so the precision is high. The characteristics of grinding work are fine and even, and the cleanliness requirements are particularly high. The next level of grinding must not be mixed with the sand particles of the previous level. If conditions permit, all equipment and research tools shall work separately to avoid cross contamination. Grinding is an infinite pursuit, which can reach the mirror. The ball grinding is the most difficult work, and the ideal ball grinding is to complete the perfect work by mechanical equipment. Only scientific mechanical structure can meet the spherical movement track, and the ideal ball can meet the requirements of hard seal pneumatic ball valve.

It has two alarm modes, LED screen alarm and voice alarm. When the vehicle passes by, it can send out a variety of voice prompt signals. In case of fault, it can send out audible and visual alarm signals.
1. Method of adding plugging fluid inside the round air door
The method of adding plugging liquid in the round air door refers to adding plugging liquid in the container, and blocking the leak after it is solidified. For example, if the water tank of a car leaks, you can add plugging liquid in the water tank, and then you can eliminate the leak point after it gradually soaks into the leak of the water tank, improves the temperature, and dissimilates.
2. Fixture method for internal compensation of round damper
The internal patching fixture method of round air door refers to adding a fixture at the leakage point to block the leakage by internal pressure. The common leak stoppage is suitable for leak points with small pressure and large leak area, such as gas holder, adsorption tower, water cooling tower and other equipment with low pressure.
When the round air door internal patching fixture method is used for plugging, first prepare to manufacture various types of T-shaped movable fixtures. The screw of the T-shaped fixture can be long or short, which can be determined according to the size of the plugging object, as shown in the figure. The head of the T-shaped clamp is a movable threading rivet. The threading rivet is a cross bar, which is determined according to the size of the leakage hole.
Next, prepare materials such as rubber plate and pressing plate.
The T-shaped clamp folds the cross bar and puts it into the loophole, then shakes the screw rod and turns over the cross bar, so that the cross bar fixes the clamp inside and outside the loophole; Add a rubber plate on the screw, apply sealant, add the same fixing plate, and press the upper nut tightly. The leakage point gradually stops. Apply sealant around it for curing.
3. Opening and glue injection and internal plugging method
A lot of glue injection is used in the whole process of plugging: drill a hole in the leaky and sealed cavity, do not drill through, tap, drill through the hole through the glue injection valve of the device, close the glue injection valve, install the glue injection gun, and inject glue. Open the glue injection valve and stop the leakage after the glue is filled.
4. Leak stopping umbrella
The leak stoppage umbrella is used for plugging leakage of tanks, pools, etc. When the oil tank breaks, the umbrella is folded and inserted into the gap, and the umbrella is forced to open. The internal medium pressure will firmly stick the umbrella to the inner wall, thus preventing leakage. The higher the pressure, the tighter the plugging. If the surface of the umbrella can not seal the pores, the polyurethane glue can be poured into the hollow handle of the umbrella to seal the small gaps.
In addition, there are many stoppers similar to the round air door plugging umbrella: the front end is a round surface, which can be made of plastic or iron sheet; There is a loose knot in the center of the umbrella, which can string the handle, and the handle can be folded. When using, the handle can be folded, inserted into the leakage gap, and then stuck into the handle. The umbrella will be stuck on both sides of the leakage gap, and then the rubber plate, sealant, and bed plate can be added outside the bowl, and the screw cap can be tightened.
5. "Air bag" two internal leak cultivation method
This "air bag" leak stoppage method is used under low pressure. It consists of several parts. Screw thread of inflation gas collector, inflation pipe, inflation pipe orifice, connection and compression screw sample, etc.