U-bolt specifications and maintenance items
What are the common specifications for U-bolts? How to repair U-bolts? Here are the specifications and maintenance items for U-bolts, and I hope to help you.
U-bolt specification
The m18 U-bolt is a nut with m18. Most of the U-bolts are made of round steel with a diameter of 16; the m20 U-bolt is a nut with m20, mostly processed with 18 round steel; and m22 U-bolts are made of m22 nuts and 20 round bars. These specifications are commonly used, the size is generally: high 600mm, inner space is 200mm, total length is: 1400mm; height is 400mm, inner space is 200mm, total length is 1000mm. Of course, the U-bolt size can be processed according to the customer's requirements, custom processing.
U-bolts generally need to be equipped with 2 nuts, a washer, a gusset or a cover or a gasket. This is a set of U-bolts. The U-bolt gasket uses a waist hole to facilitate the U-shaped card and improve work efficiency.
U-bolt repair and maintenance matters
1. When running 12000km for secondary maintenance, the oil sump should be dismantled and the operation of the bearing bush should be checked. If a single bearing bush is found to be too large, it should be replaced and the U-bolt should be replaced.
2. When assembling the connecting rod cover, use a torque wrench and tighten according to the specified specifications to avoid excessive torque and too small torque.
3. The new replacement U-bolt should be viewed during each repair. Pay attention to whether the head, guide part and thread parts of the bolt have cracks or dents. The shape and pitch of the thread are abnormal. It is necessary to be abnormal.
4. Select the U-bolt produced by the supporting plant.
U-bolt preload force problem
The sealing requirements of the connection parts of the reactor are relatively high, especially the flange diameter is more than 1 m, which makes the flange thickness and bolt size large. It is necessary to apply a large pre-tightening force to the bolt to ensure the initial sealing and pressure of the octagonal pad. Residual sealing conditions at work.
Therefore, if the initial pre-tightening is uneven or the pre-tightening force is insufficient, the bolt is accompanied by stress relaxation at the time of heating, which easily causes the bolt to be slack and the sealing cannot be achieved.
The above is about the U-bolt specifications and maintenance items. I hope everyone can understand the U-bolt specifications and maintenance items, and it will help everyone.
