How to maintain the hydraulic manhole cover in winter, what problems should be noticed?
The raw materials of the manhole cover are metal materials such as cast iron, and the metal raw materials used for equipment such as hydraulic manhole covers will not have any fundamental physical changes at minus 30 degrees, but the physical activity of the hydraulic oil at ultra-low temperatures will be somewhat different. Decline, which will cause the decline of the hydraulic system function or even a malfunction. In view of this, it is possible to participate in antifreeze in hydraulic oil. Antifreeze or antifreeze is not uncommon in our lives. Commonly used antifreeze or antifreeze is used in automobiles. The antifreeze used on the hydraulic manhole cover is not very different from this in essence, but there is still a gap in the chemical raw material structure. Therefore, special antifreeze is required, and cars or other civilian antifreezes on the market cannot be used arbitrarily . In addition, although rubber pipes are also selected for use in low temperature environments, we also need to regularly check whether there is any damage to prevent problems before they occur and destroy the failure in the bud. We also need to check regularly at the key joints of the equipment to prevent the head joints from freezing or aging in winter. Therefore, the regular maintenance in winter is a necessary operation to extend the service life of the hydraulic manhole cover. It must be carried out carefully to the ground.