1、 The use method and working principle of the dual purpose fixture for machining the outer and inner spherical surfaces The use method and working principle: firmly clamp the main body on the square tool rest of the lathe, so that the upper tool tip of the lower bar is in the same plane with the axis of the lathe spindle. The tailstock taper handle 7 is inserted into the tailstock taper hole of the machine tool. The center distance between the two pin holes of the connecting rod 5 is equal to the spherical radius of various sizes to be machined. When machining the inner spherical surface of the valve body, use the pin 6 to connect the connecting rod 5 of the required size to the lower rod 4. After the tailstock is adjusted and fixed, the inner spherical surface can be turned out by the horizontal automatic tool feeding of the middle carriage (or the manual tool feeding of the middle carriage). When machining the outer spherical surface of the valve core, connect the connecting rod 5 with the tailstock taper handle 7 of the upper rod 2. Adjust and fix the distance of tailstock. When the middle carriage is in cross feed, the upper rod 3, under the action of the connecting rod 5, moves longitudinally with respect to the main body 1 (when the middle carriage moves from the outside to the inside, the upper rod 2 moves forward with respect to the main body 1; on the contrary, it moves backward) and drives the pinion 3. The pinion drives the lower rod 4 to move in the opposite direction with the upper rod 2. After combining with the cross feed motion of the middle carriage, the outer spherical surface is turned out. The longitudinal feed and cutting depth of the inner and outer spherical surfaces are controlled by the hand wheel feed of the tailstock.

Basic knowledge of lengthening flexible waterproof casing
The concept of flexible waterproof shell is very exquisite. In my impression, there is really no concept about the slender flexible waterproof shell. It began to look for pictures on Baidu's top. Its pictures know that the slender flexible waterproof shell is a set of casing longer than the waterproof shell. Look at this picture, understand its literal meaning. Of course, its length is extended on the basis of the flexible waterproof sleeve
Later, after colleagues explained to each other, I knew that the reason for extending the flexible waterproof casing was our Gongyi City Li Tong. One customer at a time needed the flexible waterproof casing, but the result was no connection. Because the flexible waterproof casing was relatively short, which made the customer very headache and no thought. I didn't know how to get it
Later, the staff of the Technology Department came up with a good way to lengthen the flexible waterproof shell, and then after a series of tests, connect it to the pipeline. It thought that it still lacked a satisfactory solution to this problem
In general, casing is used when making a pool. It is the channel leading to the pool. However, it is difficult to seal the ordinary casing, which leads to disclosure between the casing and the pipe, and between the casing and the wall. Water leakage between the casing and the wall can only be handled by waterproof casing, and the sealing between the casing and the pipe can not be handled. The flexible waterproof shell can handle two problems