JPS5852279Y2 - Continuous annealing equipment - Google Patents

Description

[Detailed Description of the Invention] This invention particularly relates to continuous annealing equipment with an improved arrangement of a cleaning section.

As shown in FIG. 1, the conventional continuous annealing equipment for steel strips is provided with a cleaning section upstream of the entrance looper 12 for removing rolling oil and fat from the steel strip.

The entrance section including this cleaning section includes an unwinding machine 1 for the steel strip coil 17, a shear 2, and a welding machine 3 for the steel strip 18.
, a dunk tank 4 for rough washing, a No. 1 scrubber 5, an electrolysis tank 6, a No. 2 scrubber 7, a hot water tank 8, a ring roll 9 for draining water, a dryer 10, etc.

After that, sections 4 to 10 constitute a cleaning section, in which the steel strip 18 is cleaned with an alkaline solution in order to remove the rolling oil and fats that have adhered to the steel strip 18 during cold rolling. Washed and dried.

The latter stage of the cleaning section is connected to the entry side looper 12 via the Nol tension prydle 11, and the NO2 tension prydle 13, the dancer roll 14, the preheating furnace 15, and the heating furnace of the annealing furnace are further connected to the rear stage of the entry side looper 12. 16 etc. are installed.

The strip coil 17 rewound by the unwinder 1 is sent to the welding machine 3 via the shear 2, and the strip 18 is connected by the welding machine 3 so as to be annealed at a predetermined line speed in the subsequent stage, and is then sent to the welding machine 3 in the cleaning section. After removing rolling oil and the like, it is supplied to the inlet looper 12.

By the way, since the welding machine 3 connects the steel strip 18 on the entry side, the flow of the process is temporarily stopped, but the entry side looper 12
In the latter stage (referred to as the central part), the steel strip 18 must be processed at a constant speed.

The entry side looper 12 is a device provided to resolve this trade-off.

That is, the strip steel 18 connected by the welding machine 3 is fed into the input looper 12 at a faster speed than the central portion, usually 1.25 to 1.5 times the speed. This is done so that even if the process at the inlet side is stopped, the process at the center is always carried out at a constant speed.

Therefore, the cleaning section needs to be equipped to meet the above-mentioned high speed, which results in increased equipment costs, as well as increased consumption of alkaline solution and electrolytic power consumption.

In addition, the steel strip 18 heated to around 100°C in the cleaning section is cooled down to room temperature before entering the subsequent annealing furnace, but generally when the steel strip 18 is sent to the heating furnace 16, It is desirable to keep the temperature as high as possible.

The preheating furnace 15 adjacent to the heating furnace 16 is provided for this purpose, and conventionally, the steel strip 1
Preheating 8.

However, since the heat transfer coefficient is extremely small in the counterflow of exhaust gas, the temperature rise of the steel strip 18 is small, and a large preheating furnace 15 is required to heat the steel strip 18 to a predetermined temperature (usually around 200°C). was there.

This idea was developed based on the above circumstances, and was developed in continuous annealing equipment in which a cleaning section for removing rolling oil, etc. from the material to be annealed was disposed next to the annealing furnace after the entrance looper. By configuring the dryer in the cleaning section as a dryer that injects heated gas such as exhaust gas, equipment costs and running costs can be reduced.

This invention will be explained in detail below based on an embodiment shown in FIG.

Note that the same symbols as those in FIG. 1 indicate the same names.

The entry side section is composed of an unwinding machine 1 for the strip steel coil 17, a shear 2, a welding machine 3 for the strip steel 18, etc., and this entry section is connected to the entry side looper 12 via a pinch roll 19. .

A dunk tank 4, a No. 1 scrubber 5, an electrolytic tank 6, a No. 2 scrubber 7, a hot water tank 8, a ringer roll 9, and an exhaust gas injection dryer 10a, which constitute a cleaning section, are arranged downstream of the inlet looper 12. Tension prydle 11. A heating furnace 16 of an annealing furnace is provided via a dancer roll 14.

In the above configuration, since the cleaning section is disposed downstream of the inlet looper 12 and adjacent to the incinerator, the equipment cost and running cost of the cleaning section can be reduced by the difference in processing speed compared to the conventional method. It can be measured.

In addition, the steel strip 18 heated in the cleaning section is dried in the exhaust gas injection dryer 10a and at the same time heated by the exhaust gas jet flow that has a high heat transfer coefficient. It can be sent to the heating furnace 16 while being held in place.

Therefore, equipment costs can be reduced in this respect as well.

Note that the exhaust gas injection dryer 10 in the above embodiment
For a, air heated by the sensible heat of the exhaust gas can be used instead of the exhaust gas, or a heating gas other than air can also be used.

Further, the tension unit conventionally provided on the outlet side of the cleaning section can be omitted due to the arrangement structure of the cleaning section of this invention, and can also be replaced with a smaller unit such as a pinch roll unit.

As detailed above, the basic feature of the continuous annealing equipment of this invention is that the cleaning section is located downstream of the inlet looper and adjacent to the annealing furnace, resulting in a significant reduction in running costs and equipment costs. This makes an industrially significant contribution to the field of continuous annealing, particularly for continuous annealing materials for cutting plates and continuous annealing materials for rolling steel sheets.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional continuous annealing facility, and FIG. 2 is a block diagram of a continuous annealing facility according to an embodiment of this invention. 1... Rewinding machine, 2... Shear, 3.
...Welding machine, 4...Dunk tank, 5.
...No.1 scrubber, 6..Electrolysis tank, 7..No.2 scrubber, 8..Hot water tank, 9..Linga roll, 10.・・・・・・
・Dryer, 10a...Exhaust gas injection dryer, 11...Tension prydle, 12...
...Enter side loopa, 14...Dancer roll, 1
5... Preheating furnace 1, 16... Heating furnace (annealing furnace), 17... Steel strip coil, 18...
・Strip steel.

Claims (1)

[Scope of utility model registration request] In a continuous annealing facility in which a cleaning section for removing rolling oil and fat etc. from the material to be annealed is arranged next to the annealing furnace after the entrance looper, the dryer of the cleaning section is a heated gas injection type such as exhaust gas. Continuous annealing equipment characterized by comprising a dryer.