在清代，宫中的铜缸是由内务府统一管理的。每天一早，内务府官员便命苏拉（杂役）从井内汲水，一担一担地把所有大缸灌满，以备防火之用。每年到了小雪季节，宫内的太监就要在铜缸外套上一层特制的棉套，上面再加上厚厚的缸盖。同时在铜缸下的汉白玉石基座里放置一盆炭火，并保证其昼夜不息地燃烧着。这样，通过双重保暖措施，防止缸内的存水结冰。保暖工作一直要到第二年的惊蛰时节才能结束，那时大地回春，气候已经逐渐转暖，太监们就会解去棉套，撤去炭火。为了保证宫中有足够的水源用于灭火，当时在宫中设置了许多大缸。据《大清会典》记载，宫中共有大缸308口。但世事沧桑，由于各种原因，如今只剩下231口了。这些大缸共分为铁、铜和鎏金铜三种。一般来讲，铁缸是明代时铸造的；铜缸有明代的，也有清代的；鎏金铜缸则均是清代铸造的。其中，以铜缸居多，所以人们习惯地称宫中的大缸为铜缸。

In the Qing Dynasty, the copper cylinders in the palace were under the unified management of the Interior Office. Early in the morning, the officials of the house office ordered Sura to collect water from the well and fill up all the large cylinders with a single load, so that they could be used for fireproofing. Every year, in the light snow season, the eunuch in the palace will coat the copper cylinder with a special cotton sleeve and a thick cylinder head. At the same time, a basin of charcoal fire is placed in the base of Han Baiyu stone under the copper cylinder, and it is guaranteed to burn day and night. In this way, the water stored in the cylinder can be prevented from freezing by means of double warming measures. The work of heat preservation can't be finished until second years of waking up. When the weather returns to the spring, the eunuch will remove the cotton and remove the charcoal fire. In order to ensure that there was enough water for fire extinguishing in the palace, many large cylinders were set up in the palace at that time. According to the Daqing Huidian, there are 308 large cylinders in the palace. But for various reasons, there are only 231 people left in the vicissitudes of the world. These cylinders are divided into three types: iron, copper and gold and copper. Generally speaking, iron cylinders were cast in Ming Dynasty; copper cylinders were cast in Ming Dynasty and Qing Dynasty; gold cylinders were cast in Qing Dynasty. Among them, copper cylinders are the majority, so people used to call the big cylinders in the palace as copper cylinders.

唐县汇丰工艺品厂是一家铜雕塑设计制作一体的工艺品厂家，如今为各个施工单位提供铜缸雕塑产品，有故宫铜缸、铜大缸、寺庙铜大缸、铸铜大缸、黄铜大缸、青铜缸等，铜大缸，欢迎前来洽谈选购。

Tangxian County Huifeng arts and crafts factory is a copper sculpture design and production craftwork manufacturer. Now it provides copper cylinder sculpture products for various construction units. It has the Imperial Palace copper cylinder, copper cylinder, temple copper large cylinder, cast copper cylinder, brass cylinder, bronze cylinder, etc.