First, the reason analysis
1. There are many connecting and rotating parts of the automatic shutter, and the rotating shaft is non-bearing, which causes the consumption of the tension spring of the automatic shutter. When the moving contact, inspection post and quick-acting claw of the automatic shutter are knocked down, they are fixed only by the elastic force of the tension spring. When the weather changes, especially when the temperature changes suddenly in winter, the consumption of the tension spring of the automatic shutter will increase.
2. The inspection column moves up and down in the automatic shutter. Because all parts are closely connected, the box of the shutter is not easy to clean, and all kinds of dirt and grease stick to the inspection column, which makes the inspection column fall inflexible. When the temperature changes, the grease will condense, which will also lead to the blockage of the inspection column in the action hole.
3. The quick-acting claw and elbow are in plane contact with the automatic shutter, and the contact surface is easy to rust and produce oil pollution, which hinders the movement of the quick-acting elbow.
4. Due to the poor sealing of the switch machine, the poor oil quality in the machine and the bad working environment of the switch machine, all the rotating parts are inflexible.
5. When the automatic shutter leaves the factory, it is painted twice, and the paint softens under the immersion of oil pollution, which leads to the thickening of the contact surface of the elbow and the paint film on the box body of the automatic shutter, which hinders the action of the elbow and the contact seat.
6. The equipment quality is low, the automatic switching is not smooth, and the gap is not standardized, which will also cause failures.
Second, the solution
1. Check whether there are rust, scars, burrs, paint and sundries on both sides of the four-box hole and the directional groove at the bottom corner of the contact seat. If there is, it must be filed with a file and gauze to make its surface smooth.
2. The side surfaces of the left and right brackets in contact with the four square holes of the contact seat have no abrasion marks, and the movement must be flexible.
3. The connecting shaft of the inspection column should be straight without bending, and can drive the inspection column to move accurately in the connecting groove of the inspection column. If there is any bending, it must be corrected on the platform before it can be used.
4. Check whether the size of the column meets the standard. Burrs, grease and paint are not allowed on the surface of the column and the inner wall of the hole. It must be filed with a file and gauze to make the surface smooth. The column should move freely in the contact seat hole without jamming.
5. The contact surface between the side of the adjusting frame and the contact seat should be free from abrasion, and the holes of the adjusting frame and the connecting plate should be consistent.
6. The left and right crankshafts should be closely matched with the rectangular holes of the bracket without gaps.
7. The angles of the left and right crutches should be strictly checked. +/- 12 ",if it does not meet the standard, a new crankshaft must be replaced.
8. After the left and right pivots are installed with the bracket and the inspection column, they should be able to rotate freely and not fall freely from external forces.
9. The two holes of the tension spring head should be screwed on a plane, and it is forbidden to be skewed. After assembly, the tensile test can achieve flexible action and no jamming. After the moving contact is driven into the static contact, pull it by hand, and the pin holes of each part are properly matched, with the maximum clearance not exceeding 0.2 mm and the opening momentum not exceeding 2 mm..
10. adopt soft sealing belt to seal the electric point machine. 1 1. High-quality lubricating oil is used for all rotating lubricating parts of electric switch machine to reduce oil pollution. 2.2 Add booster spring
Install the booster spring of the automatic shutter on the connecting shaft of the inspection column, and when the inspection column rises, the spiral section of the booster spring tightens to form a pulling force; When descending, the tension of the spring is released to form a booster, which pushes the inspection column of the automatic shutter to act, thus increasing the tension of the tension spring of the automatic shutter. The booster spring adopts elastic steel wire that meets the national standard, and the elasticity will not change with the number of actions. The booster spring is installed on the connecting shaft between the inspection column and the movable contact, which does not fall off or deform, and does not hinder the up-and-down movement of the inspection column, so that the electric contact is sealed. Observe the fail-safe principle.
The booster spring has been tested and used, and the effect is good, which will fundamentally eliminate the failure of automatic shutter inflexibility.