Pickling device

Details Pickling device Pickling device

1999-10-06

2001-10-23

Stinson, Frankie L. (Department: 1746)

Drying and gas or vapor contact with solids

Apparatus

For diverse operations on treated material

C134S12200P, C134S199000, C134S198000

Reexamination Certificate

active

06305096

ABSTRACT:

TECHNICAL FIELD
This invention relates to an acid pickling device for washing and removing oxide scale, formed on the surface of a strip plate, by acid pickling.
BACKGROUND ART
In removing oxide scale formed on the surface of a strip steel plate, common practice is to guide this strip steel plate into an acid pickling tank filled with an acid liquid by a guide roll, and cause the strip steel plate to travel in the acid liquid, thereby washing and removing the oxide scale on the surface by means of the acid liquid. For this purpose, an acid pickling device is available which comprises two or more acid pickling tanks connected together, the acid pickling tanks being filled with an acid liquid of different acid concentrations, and in which a strip steel plate is caused to travel in the acid pickling tanks sequentially to remove oxide scale on the surface of the strip steel plate reliably.
FIG. 8
is a schematic side view of a conventional acid pickling device.
In the conventional acid pickling device, as shown in
FIG. 8
, an acid pickling tank body
101
is partitioned with a partition wall
102
into a first tank
103
and a second tank
104
, and the first tank
103
and the second tank
104
are almost the same in constitution. That is, the first tank
103
and the second tank
104
are open upwards, and they are filled with acid liquids L
1
and L
2
, respectively, of different concentrations for acid pickling of a strip steel plate S. A lid
105
is attached to the top of the acid pickling tank body
101
to form an inlet portion
106
in the first tank
103
, and an outlet portion
107
in the second tank
104
. To the inlet portion
106
, an aerial deflector roll
108
and an immersion deflector roll
109
are attached. To the outlet portion
107
, an aerial deflector roll
110
and an immersion deflector roll
111
are attached. To an intermediate portion, an aerial deflector roll
112
and immersion deflector rolls
113
are attached.
From a lower surface of the lid
105
, ceiling plates
115
,
116
are suspended via engagingly stopping portions
114
for immersion in the first tank
103
and the second tank
104
, respectively. From the ceiling plates
115
,
116
, bottom plates
117
,
118
are suspended via connecting plates (not shown) located at both side parts. On the lower surface of the ceiling plates
115
,
116
, many immersion guide rolls
119
,
120
rotatable via bearing portions are mounted along a direction of travel of the strip steel plate S. On the upper surface of the bottom plates
117
,
118
, many skids
121
,
122
are attached at positions opposed to the immersion guide rolls
119
,
120
.
Thus, the strip steel plate S is guided by the aerial deflector roll
108
and the immersion deflector roll
109
at the inlet portion
106
into the acid liquid L
1
of the first tank
103
, and travels, while being guided, between the immersion guide rolls
119
and the skids
121
. At this time, oxide scale formed on the surface of the strip steel plate S is washed with the acid liquid L
1
and removed thereby. Then, the strip steel plate S is guided by the aerial deflector roll
112
and the immersion deflector roll
113
to pass over the partition wall
102
and come into the acid liquid L
2
of the second tank
104
. Then, the strip steel plate S travels, while being guided, between the immersion guide rolls
120
and the skids
122
. On this occasion, the oxide scale formed on the surface of the strip steel plate S is washed with the acid liquid L
2
and removed thereby. Then, the strip steel plate S is guided by the immersion deflector roll
111
and the aerial deflector roll
110
at the outlet portion
107
, and delivered outside of the second tank
104
.
Such a conventional acid pickling device is disclosed, for example, in Japanese Unexamined Patent Publication No. 5-78870.
With the foregoing conventional acid pickling device, the acid pickling tank body
101
is divided into the first tank
103
and the second tank
104
by the partition wall
102
so that the acid liquids L
1
and L
2
do not mix. Because of this configuration, when the strip steel plate S moves from the first tank
103
to the second tank
104
, the strip steel plate S is guided, in a bent shape, by the aerial deflector roll
112
and the immersion deflector rolls
113
. This plate S is once pushed out of the first tank
103
, and then entered into the second tank
104
. At this time, a great bending stress acts on the strip steel plate S, increasing the tension of the strip steel plate S in the entire acid pickling device, and consuming a high operating power.
Furthermore, when the strip steel plate S moves from the first tank
103
to the second tank
104
, it is guided by the aerial deflector roll
112
and the immersion deflector rolls
113
. Thus, these rolls
112
,
113
inevitably contact the acid liquid L
1
. This requires their constant mounting and dismounting for maintenance, increasing the running cost.
The present invention has been accomplished in an attempt to solve the above problems. Its object is to provide an acid pickling device of a decreased cost, and with an increased efficiency of acid pickling treatment for a strip plate.
DISCLOSURE OF THE INVENTION
The present invention is an acid pickling device for acid pickling a strip plate by causing the strip plate to travel in an acid pickling tank filled with an acid liquid while guiding the strip plate by an immersion guide roll and a skid, wherein two or more of the acid pickling tanks are adjacent to each other via a border site, and a liquid seal is provided at the border site, the liquid seal having a cushion nozzle for jetting the acid liquid in the acid pickling tanks toward a surface of the strip plate traveling in the acid pickling tanks.
Thus, the strip plate can be supported in a straight form between the plural acid pickling tanks, and a great bending stress does not act on the strip plate. As a result, the tension of the strip plate in the entire device can be decreased, and an increase in the operating power can be prevented. Besides, no rolls are present between the adjacent acid pickling tanks. Maintenance of such rolls becomes unnecessary, and the running cost can be reduced. Consequently, the cost of the device can be decreased, and the efficiency of acid pickling for the strip plate can be increased.
The present invention also concerns the acid pickling device, wherein at the border site, a partition wall is provided below the strip plate traveling in the acid pickling tanks; a fixed skid is provided on top of the partition wall at nearly the same height as the height of the skid; and the cushion nozzle is provided above the strip plate traveling in the acid pickling tanks.
As noted above, a plurality of acid pickling tanks are formed by partitioning one acid pickling tank body with the partition wall, and the fixed skid and the cushion nozzle are provided above the partition wall. Thus, the acid pickling tanks for acid pickling the strip plate while supporting it easily in a straight form can be formed.
The present invention also concerns the acid pickling device, wherein at the border site, a partition wall is provided below the strip plate traveling in the acid pickling tanks; a lower cushion nozzle is provided on top of the partition wall; and an upper cushion nozzle is provided above the strip plate traveling in the acid pickling tanks.
Thus, the acid liquid is jetted through the cushion nozzles toward an upper surface and a lower surface of the strip plate traveling in the acid pickling tanks. As a result, the acid liquids in the adjacent acid pickling tanks do not mix, and liquid sealing can be achieved reliably.
The present invention also concerns the acid pickling device, wherein the cushion nozzle has a first jetting nozzle for jetting the acid liquid in one of the adjacent acid pickling tanks, and a second jetting nozzle for jetting the acid liquid in the other acid pickling tank.
Thus, the acid liquid jetted from the first jetting nozzle collides with the surface of the strip plat

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