Cooling water constant temperature control device for multi-layer co-extrusion nylon casing film production line

The utility model relates to the technical field of casing membranes, in particular to a cooling water constant temperature control device for a multi-layer co-extrusion nylon casing membrane production line. Comprising a water tank and a tubular discharging mechanism, and the tubular discharging mechanism is used for enabling casings to pass through the water tank; the first end of the tubular discharging mechanism penetrates through the bottom of the water tank, the second end of the tubular discharging mechanism extends into the water tank, a first water injection pipe used for injecting long-flow cooling water is connected into the water tank, and the height from the first water injection pipe to the inner bottom face of the water tank is larger than the height from the second end of the tubular discharging mechanism to the inner bottom face of the water tank; the cooling water is continuously injected into the water tank from the first water injection pipe, when the casing passes through the water tank f