JPH0159357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for removing residual liquid adhering to the surface of a steel strip wetted with a treatment liquid, such as a chemically treated steel strip.

[Conventional technology]

After the steel strip that is subjected to chemical conversion treatment while being continuously transferred in the chemical conversion treatment line passes through the chemical conversion treatment bath, excess treatment liquid adhering to the surface is removed by a rubber-lined Ringer roll. However, it is difficult to reliably remove the adhering liquid on the surface of the steel strip from the entire widthwise direction of the steel strip using just the Ringer roll, and a considerable amount of the processing liquid remains especially at the left and right edges of the steel strip. do. If this is left as it is, so-called edge stain (uneven treatment) will occur and the quality of the steel strip will be impaired, so it is necessary to promptly remove the residual liquid from the edges. As a method for removing the residual liquid, a pair of left and right air nozzles are placed on the exit side of the ringer roll, and air is blown onto the left and right edges of the steel strip immediately after passing through the ringer roll to blow out the residual liquid. A method of wiping has been proposed (Special Publication No. 53-23857).

[Problem to be solved by the invention]

The remaining liquid on the edge of the steel strip is removed by air blowing.
In order to reliably remove unevenness in the longitudinal direction of the steel strip, it is necessary to keep the air nozzle oriented correctly toward the edge at all times without shifting the air blowing position to the steel strip from the edge. is necessary.

However, the steel strip fed on the transfer line is usually accompanied by meandering (positional fluctuation in a horizontal plane containing the steel strip in a direction perpendicular to the steel strip transfer direction). In addition, when the steel strip has not been side trimmed, the left and right edges exhibit an irregular wave shape in which unevenness is gently repeated in the longitudinal direction, and the width of the strip varies greatly in the longitudinal direction. For this reason, the edge of the steel strip that passes through the air nozzle installation portion is misaligned with respect to the air nozzle installed there, making it impossible to apply a sufficient blowing action of air to the edge portion.

As a countermeasure to this, the shape of the air nozzle injection port is
It is conceivable to make the steel strip into an elongated slit shape in the width direction so that the necessary amount of air collides with the edge even if the edge position changes to the left or right side in the width direction. requires a large-capacity blower, which results in wasteful air consumption. Since the width of steel strip varies widely depending on the product specifications, the above-mentioned waste will further increase if an air nozzle that can be used in common with steel strips of various widths with different specifications is installed.

The present invention has been made in order to solve the above-mentioned problems regarding the treatment of residual liquid on the edge of a steel strip using an air nozzle.

[Means and actions for solving the problem]

The present invention is a method for removing residual liquid adhering to the surface of a steel strip, in which residual liquid adhering to the left and right edges of the steel strip immediately after passing through a ringer roll is blown off by an air nozzle directed toward the edge portions in a steel strip transfer line. Then, the carts 2, 2 equipped with edge position detection devices 3, 3 for detecting changes in the position of the left and right edges of the steel strip in the strip width direction due to width fluctuations, meandering, etc. of the steel strip are installed on the left and right edges of the steel strip, respectively. An air blowing device 7, 7 having air nozzles 73, 73 for blowing air to the left and right edge portions of the steel strip is disposed movably forward and backward in the width direction of the steel strip on the side of the bogies 2, 2. The edge position detection devices 3, 3 are arranged so as to be movable in advance and retreat on the left and right sides of the steel strip so as to move forward and backward in the sheet width direction in conjunction with each of the edge position detection devices 3, 3. By moving the carts 2, 2 forward and backward in accordance with the positional changes of the left and right edges of the steel strip, the carts 2, 2,
Air nozzles 72 provided in the air blowing devices 7, 7 move forward and backward in conjunction with the trolleys 2, 2, and the air nozzles 72, 72
The steel strip is characterized by maintaining a predetermined positional relationship with respect to the left and right edge portions.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to drawings showing embodiments. Figure 1 is a front view showing the part of the truck equipped with the steel strip edge position detection device (-
Fig. 2 is a front view showing the air blowing device section equipped with an air nozzle (view from the - arrow in Fig. 3), and Fig. 3 shows the cooperative relationship between the trolley section and the air blowing device section. It is a side view which shows an example.

In FIG. 1, reference numerals 1 and 1 are rails for running the bogie, and the rails 1 and 1 are horizontally arranged in the width direction of the steel strip S on the lower surface side of the steel strip S.

The two carts 2, 2 are located on the left and right sides of the steel strip S, respectively, and are arranged to be movable forward and backward on the rails 1, 1. In addition, 2a is the trolley body, 2
b, 2b are the axles of the truck, 2c, 2c are the axles 2b,
It is a wheel attached to 2b, and two trolleys 2,
2 has the same shape and structure with left and right symmetry.

Reference numerals 6 and 6 indicate screw shafts that are located on the left and right sides of the steel strip S, respectively, and are arranged parallel to the rails 1, 1, and each screw shaft 6, 6 is
It is connected to the carts 2, 2 via members 2d, 2d attached to the bottoms of the carts 2, 2, respectively. The screw shafts 6, 6 each advance the carts 2, 2 along the rails 1, 1 (move toward the side closer to the steel strip) by the forward and reverse rotation motion given by the motors 4, 4 as described later. and then retreat (move away from the steel strip).

Each truck 2 is equipped with a phototube sensor as a steel strip edge position detecting device 3, which includes light projecting tubes 31a, 31b, 31c, and 31d and light receiving tubes 32a, 32b, 32c, and 32d. Flood tube 31a~
Each of the light receiving tubes 31d and 32a to 32d is a set of a plurality of tubes (four in the example shown), and the light projecting tubes 31a to 31d are attached to the light projecting tube support 3a and are attached to the lower surface of the steel strip S. located at the light receiving tube 32a
32d is attached to the light receiving tube support stand 3b and located on the upper surface side of the steel strip S. The floodlight tube 31a,
31b, 31c, 31d and light receiving tubes 32a, 32
b, 32c, and 32d are given a one-to-one positional relationship.

Light projecting tubes 31a to 31d and light receiving tubes 32a to 3
The interval in the lateral direction (width direction of the steel strip) between adjacent light projecting tubes and mutually adjacent light receiving tubes at 2d is, for example, 10 to 15 mm. In the figure, the floodlight tube 31
The rows of a to 31d and the light receiving tubes 32a to 32d are not arranged in the same direction as the width direction of the steel strip, but the rows of adjacent light projecting tubes and adjacent light receiving tubes are aligned in the longitudinal direction of the steel strip. (see Figure 3), and are arranged in a row that is inclined with respect to the width direction of the steel strip (however, the projection interval in the lateral direction is 10 to 20 mm). This is the floodlight tube 31
This is to give the mounting bases of the light receiving tubes 32a to 32d the necessary spacing for installation, and depending on the type and shape of the sensor probe used, it may be arranged in one row in the same direction as the width direction of the steel strip. If possible, it is not necessary to use the slanted arrangement shown in the figure.
It is sufficient to install them in one row in the horizontal direction.

Steel strip edge detection devices 3, 3 for each of the above-mentioned carts 2, 2
The respective detection signals are input to a truck drive control device (not shown), converted into drive control signals for each of the motors 4, 4, and output.

In FIG. 2 (-arrow view in FIG. 3) showing the air blowing device, 75 supports the air blowing devices 7, 7 located on the left and right sides of the steel strip S so as to be movable forward and backward in the width direction of the steel strip S. The guide shaft 75 is located on the lower surface side of the steel strip S and is installed in a direction perpendicular to the steel strip transport direction. 71 is an air nozzle base, and 72 is an air nozzle support arm provided on the base 71. Air nozzle base 71
is a block that is slidably attached to the guide shaft 75, and the air nozzle support arm 72 provided on the base 71 has two air nozzles 73, 73 attached to the ringer rolls 81, 82, respectively.
The lower and upper surfaces of the steel strip S on the outlet side (FIG. 3) are attached so as to face toward the edge of the steel strip.

Numerals 58 and 58 are screw shafts for causing the air blowing devices 7 and 7 to move forward and backward in the width direction of the steel strip. The screw shafts 58, 58 are parallel to the guide shaft 75, and the air nozzle bases 71, 7
1, respectively. Each screw shaft 58,5
8 moves the air blowing devices 7, 7 forward and backward along the guide shaft 75 in the width direction of the steel strip by the motors 4, 4 that rotate forward and backward.

In FIG. 3, reference numeral 4 is a variable speed reversible rotary motor which is a driving source for advancing and retracting the truck 2 and the air blowing device 7, 51, 53, 55, and 57 are miter gears, respectively, and the output shaft of the motor 4 is connected to the miter gear 51. has been done. The rotational output of the motor 4 is transmitted to a screw shaft 6 (first
), while the miter gears 51, 55,
57, and is also transmitted to a screw shaft 58 (FIG. 2) connected to the air blowing device 7 via shafts 54 and 56. As a result, the truck 2 and the air blowing device 7 move forward and backward in the same direction and the same amount of movement in conjunction with each other. Although FIG. 3 only shows the right side of the steel strip, the trolley 2 and air blowing device 7 on the left side are also controlled by the motor and rotational output transmission mechanism in the same way as described above. Linked forward and backward movements are performed.

4 to 8 show the forward and backward movements of the cart 2 and the air blowing device 7, and the position changes of the steel strip edge position detection device 3 and the air nozzles 73, 73 with respect to the steel strip edge (each figure shows the phototube sensor part, and the air nozzle part). Although the figure shows the right side of the steel strip, the movement control of the cart and air blowing device and the position change of the air nozzle relative to the edge of the steel strip are exactly the same for the left side.

As shown in FIG.
Two phototubes 31b located in the center of d,
When the edge of the steel strip S is located between 32b and 31c, 32c (hereinafter referred to as the "sensor row center position"),
The trolley 2 and the air blowing device 7 are arranged in advance so that the air blown from the air nozzles 73, 73 coincides with the edge portion of the steel strip S.
The positional relationship is given.

The position of the steel strip edge with respect to the phototube sensor section and its change are determined for each phototube 31a, 32a to 31d,
32d, and a control signal output from the control device to the drive motor 4 based on the detection signal, the trolley 2 and the air blowing device 7 are
forward and backward movements are performed.

That is, as shown in FIG. 4, when the steel strip edge is located at the center of the sensor row, the photocell 3
Among 1a, 32a to 31d, 32d, the front 2
The two photocells 31d, 32d and 31c, 32c are shielded from light by the steel strip S (OFF), and the two photocells 3 on the rear side
1b, 32b and 31a, 32a are light emitting and receiving (ON)
state, and from this on/off detection signal,
The edge of the steel strip is located at the center of the sensor row, and therefore the air nozzles 73, 73 are determined to be in a state (appropriate position) that matches the edge of the steel strip. In this state, the drive signal from the control device to the motor 4 is There is no output, and the truck 2 and air blowing device 7 remain stopped at that position.

On the other hand, if the edge of the steel strip S is from the center of the sensor row,
If it shifts forward, for example in the example shown in FIG. 5, the edge of the steel strip will move as shown in the figure based on the detection signal that only the frontmost phototubes 31d and 32d are off and the remaining phototubes 31c, 32c to 31a, 32a are on. The frontmost phototubes 31d and 32d and the adjacent phototube 31
c and 32c, a forward rotation drive signal is output from the control device to the drive motor 4, and the forward rotation drive causes the trolley 2 to move forward (arrow A). Due to the forward movement of the cart, the edge of the steel strip S is moved to the second photocell 31c,
32c and reach the center of the sensor row. Trolley 2
As the air nozzles 73 move forward, the air nozzles 73, 73 move forward by the same distance as the forward movement distance, and the state shown in FIG. 5 shifts to a proper state that coincides with the edge portion of the steel strip shown in FIG.

If the edge of the steel strip S is shifted forward from the frontmost phototubes 31d and 32d as shown in Fig. 6,
All of the phototubes 31d, 32d to 31a, 32a are turned on, and the deviation of the steel strip edge is determined from the detection signal, and the motor 4 is activated by the rotational drive signal from the control device as in the case of FIG. 5 above. The trolley 2 moves forward due to the positive rotation drive of
Due to the forward movement, the steel strip S passes through the fifth state described above and reaches a state where the edge is located at the center of the sensor array as shown in FIG. Along with this, air nozzle 7
3 and 73 move from the initial state shown in FIG. 6 to the state shown in FIG. 5, and then to a proper position that coincides with the edge of the steel strip as shown in FIG.

Further, contrary to FIGS. 5 and 6, if the edge of the steel strip S is shifted backward from the center of the sensor row, for example, in the example of FIG.
Only 32a is on, other photocells 31b, 32b~
From the detection signal that both 31d and 32d are off, the steel strip edge is located at the rearmost photocell 3 as shown in the figure.
1a, 32a and the adjacent phototubes 31b, 32b
Based on the detection signal, the control device controls the drive motor 4.
A reverse rotation drive signal is output, and the carriage 2 moves backward (arrow A) due to the reverse rotation drive. As the cart moves backward, the edge of the steel strip S crosses the second phototubes 31b and 32b and reaches the center of the sensor array. As the truck moves backward, air nozzle 7
3 and 73 move backward by the same distance (arrow mark A) to shift from the state shown in FIG. 7 to the proper position shown in FIG. 4.

If the edge of the steel strip S is shifted backward from the rearmost phototubes 31a, 32a as shown in FIG. 7
As in the case shown in the figure, a reverse rotation drive signal is output to the drive motor 4, and the truck 2 moves backward. Due to the backward movement of the truck, the steel strip S passes through the state shown in FIG.
3 and 73 move from the initial state shown in FIG. 8 to the state shown in FIG. 7, and then to the proper position corresponding to the steel strip edge portion as shown in FIG. 4.

When starting the transfer of the steel strip when performing the residual liquid removal process using the above device, the carts 2, 2 should be moved to the rear side on the rails 1, 1 to prevent collisions and interference with the steel strip. It is preferable that the cart and the air blowing device are moved based on the above-mentioned steel strip edge position detection signal at the same time as the steel strip transfer starts.
In this case, the cart moves from a state where the edge of the steel strip is located in front of the frontmost phototubes 31d and 32d as shown in FIG. 6 until it reaches near the center of the sensor row as shown in FIG. The work efficiency can be increased by performing two-step drive control in which the speed is set at high speed, and the speed at which the trolley moves from that position to the center of the sensor row in Figure 4 is lower than that. can.

In the above embodiment, the advancing and retracting mechanism of the air blowing device 7 is separate from that of the truck 2, the air nozzle base 71 is engaged with the guide shaft 75, and the rotational driving force of the motor 4 is transferred to the truck 2. Although it is assumed that the transmission is carried out by a route different from that to the air nozzle base 7, the transmission is not necessarily limited to this.
It is of course possible to create a structure in which the rotational drive force transmission mechanism from the motor 4 to the air blowing device 7 is omitted by directly connecting the motor 1 to the trolley 2 via a suitable connecting member. Further, although a phototube is used as a sensor for detecting the edge position of the steel strip S, it goes without saying that other sensors such as those using eddy current may be used.

〔Effect of the invention〕

According to the present invention, residual liquid attached to the left and right edges of a steel strip after undergoing chemical conversion treatment, etc. can be reliably blown away by air nozzles, regardless of meandering of the steel strip, fluctuations in strip width, etc. Due to the residual liquid removal effect, effects such as prevention of surface defects such as edge stain and improvement of the surface quality of the steel strip can be obtained. The air nozzle used in the residual liquid wiping process follows the change in edge position due to the meandering of the steel strip and changes in strip width, and is always maintained at the appropriate position relative to the edge, so there is no need to enlarge the air injection hole diameter, etc. Therefore, there is no waste of air consumption and it is highly economical. In addition,
It goes without saying that the present invention is useful not only for chemically treated steel strips, but also for the removal of residual liquid at the edges after passing through a Ringer roll during draining of steel strips after washing.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the truck portion of the device of the present invention (view from the - arrow in FIG. 3), and FIG.
Fig. 3 is a side view showing an embodiment of the device of the present invention, and Figs. 4 to 8 show the forward and backward movement of the cart and air blowing device of the device of the present invention and their positional relationship with respect to the steel strip. FIG. 1: Rail, 2: Trolley, 3: Steel strip edge position detection device, 31a to 31d: Flood tube, 32a to 32
d: Light receiving tube, 4: Drive motor, 6: Screw shaft, 51, 53, 55, 57: Miter gear, 5
2, 54, 56: shaft, 58: screw shaft, 7:
Air blowing device, 71: Air nozzle base, 73: Air nozzle, 75: Guide shaft, 81, 82: Ringer roll.

Claims (1)

[Claims] 1. In a steel strip transfer line, removing residual liquid adhering to the steel strip surface by wiping off residual liquid adhering to the left and right edges of the steel strip immediately after passing through the ringer roll with an air nozzle directed toward the edge parts. In this method, a cart 2, 2 equipped with edge position detection devices 3, 3 for detecting changes in the position of the left and right edges of the steel strip in the strip width direction due to width fluctuations, meandering, etc. of the steel strip is moved around the steel strip. Air blowing devices 7, 7 having air nozzles 73, 73 disposed movably forward and backward in the width direction of the steel strip on each of the left and right sides, and having air nozzles 73, 73 for blowing air to the left and right edge portions of the steel strip are attached to the bogie. The edge position detecting devices 3, 3 are arranged movably on the left and right sides of the steel strip in a cooperative relationship to move forward and backward in the sheet width direction in conjunction with the edge position detecting devices 3, 2, respectively. By moving the carts 2, 2 forward and backward in accordance with the positional changes of the left and right edges of the steel strip, the carts 2, 2
The air nozzles 72, 72 provided in the air blowing devices 7, 7 move forward and backward in conjunction with the trolleys 2, 2, and the air nozzles 72, 72 always maintain a constant positional relationship with respect to the left and right edges of the steel strip, respectively.
A method for removing liquid remaining on the surface of a steel strip, characterized by maintaining a predetermined positional relationship with respect to each edge portion on the left and right sides of the steel strip.