麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看There are many types of rivets, some of which are moisture-proof and some are not.

At present, there are two kinds of rivets with dampproof function: closed bolt and metal wire drawing bolt. In the two kinds of bolts, the metal wire drawing rivet has good moisture-proof function, and its compressive strength and resistance are compared with the closed rivet

麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看Because of its higher shear and compressive strength, metal wire drawing rivets have been used in refrigerated containers in the shipping industry and cannot be replaced.

麻花豆星空天美糖心mv-星麻花传媒mv-星空天美梦幻mv免费-天美麻花星空果冻mv-62星空天美梦幻糖心mv-天美电影免费在线观看For other types of rivets, the foundation is not moisture-proof or vibration is suffered in the whole process of application, resulting in poor practical effect of moisture-proof. At present, the types of non moisture-proof bolts are: general open mouth rivet. At present, the majority of refrigerated transport vehicle manufacturers in China do not use moisture-proof rivets. After considering the small cost of all aluminum rivets, we find that the key factor is the small cost of rivets. Some refrigerated transport vehicle manufacturers that have been operating for a long time do not know that moisture-proof bolts should be applied, but they have fully considered the problem of manufacturing costs. Due to the selection of non moisture-proof rivets and color core pulling rivets, each refrigerated transport vehicle can save up to 100 yuan of cost. It is worth mentioning that they also have a very clear grasp of the application of refrigerated transport vehicles The transportation company does not understand the necessity of using moisture-proof bolts in refrigerated transport vehicles.