JPH0220212Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention relates to a continuous strip electroplating device, and is concerned with the distribution of the amount of plating metal deposited in the width direction of the strip, and in particular to prevent local excessive deposition near the edges of the strip. Regarding equipment.

<Prior art and its problems> In a continuous strip electroplating line, an anode is submerged in the bottom of the plating tank, and the strip running facing the anode serves as a cathode, and electrolysis occurs during the continuous passing of the strip. However, since the plating current tends to concentrate near the edge of the strip, there is a problem of so-called edge overcoat, in which the plating metal locally adheres excessively near the edge. Edge overcoat is undesirable because it is not plated uniformly in the width direction, which causes problems when winding it into a coil.

Conventionally, to prevent this edge overcoating, a shielding strip of electrically insulating material was placed in the plating bath that partially covered the lower edge of the strip along its length from the anode; There is an edge overcoat prevention device that controls the position of the strip in accordance with a signal from a detector at the edge end of the strip facing the plating bath so that the strip width is changed to the optimum position. The strip position detector uses an image sensor or the like to calculate the strip position, and does not allow a shielding piece or the like to come into contact with the strip.

For this reason, in practice, strip position detectors can only be installed on the exit and entry sides of the plating tank, so it is impossible to detect the strip position inside the tank, and the frequent meandering that occurs when the strip runs through the plating tank. In many cases, the device could not follow changes in the strip position and could not function satisfactorily as an edge overcoat prevention device. Further, such an edge overcoat prevention device requires an image sensor, an arithmetic device, a hydraulic device, etc. as a position control device, and has the drawback that the device is complicated and expensive.

Previously, in JP-A-59-160000, the applicant provided a guide roller between the shielding piece and the strip, and by lightly pressing the guide roller against the strip, the position of the shielding piece and the strip was controlled to be constant. proposed an edge overcoat prevention device that achieves a stable edge overcoat prevention effect.

However, even in the edge overcoat prevention device disclosed in JP-A-59-160000, in order to accommodate various strip widths, a simple calculation device is required to widen or reduce the width of the shielding piece. There is no feedback to the position control, and the slight meandering of the strip is caused by a lever with a guide roller at one end swinging about a pin in balance with a counterweight at the other end of the lever. , which is mechanically absorbed, and the tracking range is small at about ±50mm. For this reason, when the meandering of the strip exceeds ±50 mm, there is a problem that the edge of the strip may be overcoated or the edge of the strip may be broken.

<Purpose of the invention> The purpose of the invention is to improve the above problems,
As a position control device, the shielding piece can follow a wide range of movements of the strip without using complicated mechanisms such as image sensors or calculation devices, and edge overcoat prevention can completely prevent edge overcoat. It provides equipment.

<Structure of the invention> The present invention uses a strip that runs facing an anode submerged in the bottom of a plating tank as a cathode, and performs electrolysis during continuous passing of the strip to perform continuous plating. When performing this, guide rollers that rotate in contact with both ends of the edge portion of the strip, and shielding pieces that cover both end portions of the edge portion of the strip facing the anode from the anode are provided. In an edge overcoat prevention device that prevents overcoat of a part, a cylinder is provided on the lever from which the shielding piece is suspended, and the lever is supported so as to be movable in a horizontal direction and rotatable on a pivot portion, A plurality of means are provided at the other end of the lever for non-contact detecting the state of contact between the guide roller and the side end of the edge portion of the strip, depending on the rotational position of the other end of the lever. An edge, characterized in that it is provided with means for controlling the state of contact between the guide roller and the edge portion in response to an on-off detection signal of the other end of the lever by the detection means. It is an overcoat prevention device.

The configuration of the invention will be described in detail below using a preferred embodiment shown in the drawings.

FIG. 1 shows a continuous strip plating line having the above-mentioned structure in a sectional view in the strip width direction. In the figure, 6 is a plating tank, 1 is a strip, and 12
is the anode.

The strip 1 is continuously passed through the plating tank 6,
The strip becomes a cathode via a conductor roll (not shown), and an anode 12 is submerged in the bottom of the plating bath below the strip 1, and the strip is plated.

The edge overcoat prevention device of the present invention includes a guide roller 2 attached to one end, a shielding piece 3, a lever 4 pivoted at a fulcrum 15, and a rotation of the other end of the pivot lever. position detector 7, 8,
9 and a drive device 5 for lateral movement of the lever.

That is, as shown in FIG. 4, a guide roller 2 made of an electrically insulating material such as ceramic, which rotates in contact with the side end of the edge portion of the strip 1, is connected to the strip 1.
At the lower end of the edge of the strip, it is mounted on a shielding piece 3, which is also electrically insulating, and is hidden from the anode 12, so that the guide roller 2 lightly touches the side edge of the strip 1, and the lever 4 is almost perpendicular to the plating liquid level. The shielding piece 3 covers the side edges of the strip 1 to sufficiently prevent edge overcoat when
The guide roller 2 and the shielding piece 3 are fixed in a positional relationship that largely hides the required amount of anode 12.

As shown in FIGS. 1 and 4, the shielding piece 3 to which the guide roller 2 is fixed is fixed to one end of the lever 4, and a weight is placed near the other end 13 of the lever 4. A pressing weight 10 is fixed. An alternative to the weight 10 can be used, provided that the lever is balanced about the fulcrum 15. On the other hand, the cylinder rod 14 of the cylinder 5 and the center part of the lever 4 are connected to the pin (fulcrum) 1.
5, and the lever 4 rotates around a pin (fulcrum) 15 depending on the state of contact between the guide roller and the strip.

In order to detect the position of the other end 13 of the lever 4 which pivots about the fulcrum 15, position detectors 7, 8, 9 (not shown) are installed in close proximity to the other end 13 of the lever 4. In the example, 3) are provided. That is, a backward position detector 7, a stop position detector 8, and a forward position detector 9. The position detector is a phototube,
Although any type of limit switch may be used, it is preferable to use a proximity switch, which is a simple device.

The position detectors 7, 8, and 9 are electrically connected to a control device 11, and the control device 11 is electrically connected to the cylinder 5. The control device 11 controls proximity switches 7, 8, and 9, which are position detectors, for example.
Any device that appropriately drives the cylinder 5 in response to ON and OFF signals may be used.

The strength of the force with which the guide roller 2 is pressed against the side edge of the strip 1 can be adjusted by changing the pressing weight 10. Therefore, at a position where the center line of the width of the strip almost overlaps with the center line of the width of the plating tank 6, the lever 4 is almost perpendicular to the plating liquid level, and the guide roller 2 is set so that it lightly touches the side edge of the strip 1. , the position of the pin 15, the weight and attachment position of the pressing weight 10 are set.

By setting as above, the lever 4 is rotated by the pressing weight 10 for a movement distance of up to ±30 mm of the strip width, the guide roller 2 sufficiently follows the movement of the strip width, and the shielding piece is 3 allows the side ends of the strip 1 to be largely hidden from the anode 12 by the required amount.

If the welding point passes through strip steel plates of different widths on the plating line, or if the meandering of strip 1 exceeds ±30 mm, the position detector 7,
8 and 9 detect the position of the shielding piece 3 based on the position of the other end 13 of the lever 4, and the detected position information is input to the control device 11.
drives the cylinder 5 according to the detection signal, and by driving the cylinder 5, the cylinder rod 1
4 expands and contracts, the pin 15 at the tip of the cylinder rod 14 (the fulcrum of the lever) moves in a direction parallel to the plating liquid level, and the lever 4 pivoted on the pin 15 moves in a direction parallel to the plating liquid level. While pressing the pin 15 as a fulcrum, the weight 10 and guide roller 2
is balanced and the lever 4 rotates, causing the guide roller 2 to follow the strip side end so as to be in proper contact with it at all times.

<Operation of the invention> With the above configuration, the invention controls the position and pressing pressure of the guide roller 2 of the edge overcoat prevention device as described below, and always keeps the strip side end against the anode 12. It is covered with a shielding piece 3 to prevent edge overcoat.

Before the edge overcoat prevention device is used and before and after the strip width changes (passing the welding point), the edge overcoat prevention device is in the state shown in FIG. 3.

When control is started, the end 13 of the lever 4 is in the position shown, so the forward position detector 9 is turned ON.
In response to this signal, a forward movement signal is output from the control device 11 to the cylinder 5, and the cylinder rod 14
As a result of the extension, the pin (pivot point) 15 moves forward, and the lever 4 moves forward.

While moving forward, the guide roller 2 comes into contact with the strip 1, the contact pressure becomes appropriate, and the lever 4 rotates about the pin 15 as a fulcrum, resulting in the state shown in FIG.

When the state shown in Fig. 1 is reached, the stop position detector 8 is activated.
Since it is turned on, a stop signal is output from the control device 11 to the cylinder 5, and the horizontal movement of the pin 15 is stopped.

Furthermore, when the strip 1 meanders to the left in FIG. 1 for some reason, that is, when the strip 1 and the guide roller 2 are separated, the lever 4 becomes the state shown in FIG. make a similar movement.

On the other hand, if for some reason the strip meanders to the right in Fig. 1 and the pressure against the guide roller becomes large, strip 1 presses the guide roller 2 strongly, causing the lever 4 to move as shown in Fig. 2. state.

When the state shown in Fig. 2 is reached, the backward position detector 7 is activated.
Since it is turned on, a retraction signal is output from the control device 11 to the cylinder 5, and the pin 15 is retracted. pin 1
While the lever 5 is moving backward, the pressing pressure of the guide roller 2 gradually decreases, and the lever 4 presses against the pin 15.
It rotates using the fulcrum as a fulcrum, and the state shown in Fig. 1 is reached.

In FIG. 1, the stop position detector is turned on, so a stop signal is output from the control device 11 to the cylinder 5, and the pin 15 is stopped.

<Effects of the invention> The edge overcoat prevention device of the invention has a guide roller in direct contact with the strip, and position control is performed by detecting the position of a lever that is integrated with the guide roller. Feedback control is possible, and the position of the side edge of the strip in the plating tank can be directly detected, rather than feedback control of the position of the strip at the exit and entry sides of the plating tank as in conventional systems. Therefore, the shielding piece and the guide roller can completely follow the meandering of the strip, and the bending of the strip and edge overcoating can be completely prevented.

Furthermore, since the position control as described above is performed, strip width information is not required, and a special calculation device is not required. Therefore, an inexpensive and simple edge overcoat prevention device can be realized.

Position control is performed independently for each plating tank, so even if a failure occurs, it is unlikely to affect other systems.

The detector is simple and does not need to be installed in large numbers.
Under normal conditions, only one switch is turned on at a time, so failure monitoring is easy, and the device is simple because the control is simple ON/OFF control.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the edge overcoat prevention device and plating liquid tank of the present invention in the strip width direction. FIG. 2 is a schematic diagram showing the position control mechanism of the edge overcoat prevention device of the present invention. FIG. 3 is a schematic diagram showing the position control mechanism of the edge overcoat prevention device of the present invention. Figure 4 shows
FIG. 3 is a detailed view of a main part of a shielding piece. Explanation of symbols, 1... Strip, 2... Guide roller, 3... Shielding piece, 4... Lever, 5... Motor cylinder, 6... Plating tank, 7... Backward position detector, 8... Stop position detector, 9... Forward position detector, 10... Pressing weight, 11... Control device, 12... Anode, 13... Lever end, 14... Rod, 15... Pin.

Claims (1)

[Claim for Utility Model Registration] A strip running facing an anode submerged in the bottom of a plating tank is used as a cathode, and electrolysis is performed during continuous passing of the strip to perform continuous plating. In this case, guide rollers that rotate in contact with both ends of the edge portion of the strip, and shielding pieces that hide both end portions of the edge portion of the strip facing the anode from the anode are provided to protect the edge portion of the strip. In the edge overcoat prevention device which prevents the overcoat of the shielding piece, a cylinder is provided on the lever on which the shielding piece is hung, and the lever is supported so as to be movable in the horizontal direction and rotatable by a pivot portion, and A plurality of means for non-contact detecting the state of contact between the guide roller and the side end of the edge portion of the strip, depending on the rotational position of the other end of the lever, are provided near the other end of the lever. and means for controlling the contact state between the guide roller and the edge portion in response to an on-off detection signal of the other end of the lever by the detection means. Coat prevention device.