JPS5918478B2 - Metal surface chemical conversion treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal surface chemical conversion treatment apparatus, and more particularly, to a metal surface chemical conversion treatment apparatus, in which a strip metal is chemically treated in an immersion method while being conveyed continuously, the contact time of the metal surface with a chemical conversion treatment solution is determined. The present invention relates to a device that allows adjustment of the temperature by a novel method.

Conventionally, when strip metal is subjected to continuous chemical conversion treatment using the immersion method,
In order to adjust the amount of chemical conversion coating by changing the contact time between the metal surface and the chemical conversion treatment solution, it has generally been adopted to change the immersion passage speed of the metal surface in the chemical conversion treatment solution.

The invention disclosed in Japanese Patent Publication No. 50-2380 can be mentioned as a technique that can provide further flexibility in controlling the contact time of the metal surface with the chemical conversion treatment solution.
According to this invention, the contact time is adjusted each time the length of the immersion region of the chemical conversion treatment liquid through which the metal surface is immersed is changed. In addition, as a chemical conversion treatment device that can change the length of the immersion area, (a) a movable partition wall that can be moved in parallel to the length direction (and the moving direction of the metal surface) in the treatment tank of a predetermined length is installed. A chemical conversion treatment solution is stored in an immersion area formed on either side of the partition wall, and the partition wall is moved while conveying the metal surface through the openings provided in both the front and rear walls of the treatment tank and the partition wall. (b) providing a plurality of fixed intermediate walls transversely dividing a treatment tank of a predetermined length, and applying chemical conversion to some of the immersion zones formed by the intermediate walls; The contact time is adjusted by varying the number of immersion zones containing the chemical conversion treatment solution while transporting the metal surface through openings provided in the front and rear walls and the intermediate wall of the treatment tank. an apparatus, (c) providing a plurality of collapsible walls that transversely divide a treatment tank of a predetermined length, and storing a chemical conversion treatment solution in an immersion area formed in communication by several folds of the walls; A device that adjusts the contact time by changing the number of folded walls while conveying the metal surface through openings provided in both the front and rear walls and the unfolded wall of the processing tank, and (
d) the treatment tank consists of at least two movable parts telescopically fitted into each other and contains therein a chemical treatment solution;
The above-mentioned invention discloses an apparatus that adjusts the contact distance by displacing the movable part while conveying the metal surface through openings provided in both the front and rear walls of the processing tank. As described above, the above invention is characterized in that the contact time of the metal surface with the chemical conversion treatment liquid is adjusted by changing the length of the immersion region itself, in other words, the length of the treatment tank.

However, in each of the above devices, movable members (for example (
(a) the partition wall, (c) the collapsible wall, (d) the two movable parts) are in direct contact with the chemical conversion treatment solution;
Since there is a high possibility that smooth movement will not be ensured due to adhesion of generated sludge, etc., it is not appropriate to actually use this device in industry. Furthermore, dividing the inside of the processing tank into a plurality of parts and providing openings for passing through the metal surface not only on the front and rear walls of the processing tank but also on the dividing means only makes the apparatus more complicated. Furthermore, another processing liquid tank is required to receive the processing liquid leaking from the openings in both the front and rear walls of the processing tank, so that a so-called double tank has to be constructed, which also results in complication of the apparatus. Therefore, from the above points, it is recognized that it is difficult to industrially advantageously employ the above invention. The present invention solves the above problems of the prior art,
In contrast to the conventional technology that controls the contact time of the metal surface with the chemical conversion treatment solution by changing the length of the immersion zone itself, this technology involves changing the immersion length of the metal surface itself with respect to the immersion zone to perform similar control. , which provides industrially practical technology. That is, according to the present invention, C! , a treatment tank 11 of a predetermined length that accommodates a chemical conversion treatment liquid; a band-shaped metal surface that is continuously conveyed horizontally along the length of the treatment tank 1 above the treatment tank 1 is bent and guided downward to penetrate into the treatment liquid; Means 111 for horizontally immersing the metal surface in the processing liquid and bending it upward to take it out from the processing liquid: immersion means 11 and/or extraction means 11! means 1V for horizontally moving the two to relatively approach or separate them, and a means 1V for spouting the processing liquid near the metal surface passing through the immersion so that it flows along the metal surface conveyance direction. A metal surface chemical conversion treatment apparatus is proposed, which is characterized by comprising a nozzle-equipped riser means v attached to the metal surface chemical conversion treatment apparatus.

Next, the apparatus advantageous to the present invention will be specifically described with reference to the accompanying drawings.

In FIGS. 1 to 3, the treatment tank 1 may be a box-shaped tank having a predetermined length as shown by 1 in the figures, and a chemical conversion treatment liquid 2 is accommodated in this to form an immersion area of a predetermined length. It is configured.

A is a strip of metal that is continuously conveyed horizontally above the tank 1 along its length;
The material is immersed in the processing liquid at the left side, passes therethrough in a horizontal state, is taken out from the processing liquid at the right side of the tank 1, and is conveyed directly above the tank 1 toward the next process. The means for infiltrating the metal A into the treatment liquid [1] and the means for removing it from the treatment liquid 111 are indicated by 3 and 4, respectively.

The infiltration means 3 includes a roll 5 that supports the metal A above the processing liquid in front of the intrusion position, and a roll that is located behind the roll 5 and holds the metal in the processing liquid after bending and guiding the metal downward. It basically consists of 6. The take-out means 4 is also basically constituted by a front presser roll 7 corresponding to the roll 6 and a rear support roll 8 corresponding to the mouth roll 5. The metal A horizontally immersed in the treatment liquid by the rolls 6 and 7 may be located within a range of about 10 to 30 nm below the liquid surface. Therefore, if the diameter of each of the rolls 5, 6, 7, and 8 is appropriately selected (for example, the diameter of the rolls 6 and 7 is set to 25011 mm or more), each of their rotational axes (i.e., movable members) can be It is possible to prevent the member from coming into contact with the processing liquid, and as a result, the problems of the above-mentioned known inventions caused by the member coming into contact with the processing liquid are solved. The positional relationship between the rolls 5 and 6 or 7 and 8 is preferably large in terms of horizontal distance, for example, a distance of 1 m or more is sufficient.

In the case of illustration based on such a viewpoint, rolls 5 and 8
The diameter of 150mm. The diameters of the rolls 6 and 7 are 250 paulownia, the horizontal distance is 1 m, and the entrance angle and take-out angle of the metal A are set to be 11 degrees, respectively. These angles may be selected as appropriate depending on the properties of the metal A to be treated, but it is preferable to keep them as small as possible, taking into account the ease of transportation of the metal A during the immersion treatment and the effect on the finished surface of the treatment. is preferred. In addition, the rolls 5, 6,
7 and 8 should have excellent chemical resistance, for example, those made of commonly commercially available neoprene (polychloroprene) or hypalon (fluorosulfonated polyethylene) are suitable, and their hardness should be about 40 to 80. good. In order to change the immersion length of the metal surface in the treatment liquid in the present invention, the intrusion means 3 and/or the extraction means 4 are moved horizontally to relatively approach or separate the two banks. In the illustrated case, an example is shown in which the intrusion means 3 is movable and the extraction means 4 is fixed in position. The means 1 for moving the infiltration means 3 may be configured as follows, for example. Rolls 5 and 6 are placed in tank 1
It is rotatably supported by movable frames 11a and 11b located on both outer sides of the frame.

This moving frame 11a has wheels 12 on the outside of its upper part.
a, 13a force (gears 14a, 15a are rotatably provided on the outside of the lower part, respectively. Wheels 12a, 13a are rails 1 with a cross-section shape provided on the lower surface of the horizontal frame 16a.
7a, and the gears 14a and 15a are engaged with a rattle 19a provided on the top surface of another horizontal frame 18a. One of the gears 15a engages with the other gear 20a,
This is connected via a speed reducer 22a to a reversibly rotatable electric motor 21a supported by a moving frame 11a.
The other moving frame 11b also has the moving frame 11a.
Each member 12b to 22b (partly not shown) corresponding to each member is arranged, and the same mechanism is adopted. and,
Both electric motors are designed to function in synchrony so as not to cause any deviation in the horizontal reciprocating motion of the movable frames 11a, 11b. In addition, when the operation stop position of this immersion means 3 is set in advance, a normal relay circuit may be employed to automate changing the immersion length of the metal surface in the processing liquid. Moreover, in order to make the extraction means 4 movable,
It goes without saying that the above configuration may be employed as is. Note that the support positions of the rolls 5 and 8 in the vertical direction may be fixed, but the rolls 6 and 7 may be supported up and down by normal means (for example, a hydraulic cylinder; an air cylinder) (not shown). Advantageously, it is movably supported.

When the rolls 6 and 7 are lifted to release the pressure on the metal A, the dipping process is temporarily interrupted while the metal A is being conveyed, and when the dipping length of the metal A is changed by moving the dipping means 3, the dipping means This is because no load is applied to the metal A on the metal A, which is advantageous in terms of its mechanism, and also allows for smooth movement. Of course, in the case of the illustrated device, only the roll 6 may be supported so as to be movable up and down.
In the present invention having the above configuration, for example, after performing a predetermined immersion treatment between the infiltration means 3 and the extraction means 4 at the position indicated by the chain line in FIG. To adjust the contact time between the two, do the following:

The roll 6 and, if necessary, the roll 7 are lifted to release their hold on the metal A, and then both of the electric motors are driven to move the infiltration means 3 horizontally to reach, for example, a predetermined position indicated by a dotted line in the figure. Then, this is stopped, and then the rolls 6 and 7 are lowered to their original positions to press the metal A into the treatment liquid again. During this time, metal A may or may not be being transported. According to the present invention, movable members such as the rotating shafts of the rolls 5, 6, 7, and 8 can be arranged so as not to come into contact with the processing liquid, so there is no need to adopt a special sealing structure for them. It becomes possible to always easily control the contact time between the two by changing the length of immersion in the treatment liquid.

Moreover, since the processing tank may be a box-shaped one having a predetermined length, the structure of the processing tank can be controlled without the risk of complicating the structure. Furthermore, the contact time can be controlled substantially steplessly over the entire predetermined length of the treatment tank (ie the immersion zone). In the field related to the present invention described above, high speed is generally employed for conveying the metal A.

By the way, in the present invention, when such high-speed conveyance is carried out, depending on the speed, the metal floats above the treatment liquid surface due to the buoyancy force acting on the metal that is immersed and passing through the treatment liquid.
Exposure of the surface poses a risk that satisfactory processing may not be achieved. In particular, when the relative velocity difference between the metal passing through the immersion and the treatment liquid in the vicinity of the metal exceeds 100 m/Mm, the occurrence of the above phenomenon becomes remarkable. In order to solve this problem, it is sufficient to reduce the above-mentioned relative speed difference to 50 m/Mm or less, preferably 20 m/Mm or less, but reducing the conveyance speed of the metal itself is difficult from the viewpoint of efficiency. Difficult to get hired.

Therefore, the present invention makes it possible to solve this problem from another perspective. That is, the processing liquid near the metal being immersed and passing through is moved in the same direction as the metal transport direction to reduce the relative speed difference. The means for this includes jetting the processing liquid 2 backward onto the inner wall and/or bottom of the processing tank 1 at the front and both sides so as not to interfere with the movement of the metal A, the infiltration means 3 and the extraction means 4. It is sufficient to arrange a riser with a nozzle to adjust the amount of processing liquid ejected by the riser. The tank 1 shown in FIG. 1 is constructed in consideration of the above-mentioned points, and is additionally constructed so that sludge generated by chemical conversion treatment can be collected and taken out of the tank.

That is, the tank 1 is configured in its longitudinal cross section so that the bottom 31 thereof slopes downward toward the rear as shown in the figure. This angle of inclination may be any angle at which the settled sludge can be moved satisfactorily, and may generally be appropriately selected within the range of 2 to 10 degrees. A recess is formed in the bottom of the rearmost part of the tank 1, and serves as a sludge recovery tank 32. Further, an overflow tank 34 is attached to the rear of the tank 1 via a drain 33. It is preferable that the sheath 33 is operable to adjust the height of the liquid level so that the metal A being immersed and passing through is located at an appropriate position below the liquid level. Bottom 31 inside the tank
A riser 35 with a nozzle is arranged nearby. The risers 35 are arranged at appropriate intervals perpendicular to the length direction of the tank 1, and their nozzles are designed to eject the processing liquid toward the rear. It has been found that the backward flow of the processing liquid by the riser 35 is preferably in the range of 0.3 to 1 m/Sec at the bottom, with the main point being the accumulation of sludge. Due to the flow of this treatment liquid, the settled sludge is moved backward, and
are accumulated in The flow also reduces the relative speed difference of the nearby processing liquid to the transport speed of the metal during the immersion. Therefore, the spacing and number of risers 35, the shape and number of nozzles, the ejection pressure of the processing liquid, etc. may be appropriately selected within the range that achieves the above objectives.
In order to compensate for the further decrease in the relative speed difference, for example, independent nozzle-equipped risers (not shown) may be installed on both side walls of the processing tank 1. The riser 35 branches from a pipe 37 with a pump 36 that communicates with the side wall of the overflow tank 34, and is connected to a pipe 39 equipped with a heat exchanger 38, so that the processing liquid in the overflow tank 34 is adjusted to a predetermined temperature. We are in the process of supplying the product after the purchase.

The temperature of the treatment liquid can be adjusted by directly introducing steam into the tank 1 instead of using the heat exchanger 38, or by installing a flexible pipe in the tank 1 so as not to interfere with the chemical conversion treatment. may be done. Sludge recovery tank 32 and overflow tank 3
Pipes 40 and 41 are connected to the bottom of each tube 4, respectively, and connected to these tubes 42, to which a pump 43 and a filter 44 are attached. Therefore, the sludge in the processing liquid in the sludge recovery tank 32 and the overflow tank 34 is discharged to the outside of the system through the filter 44. On the other hand, the bottom liquid may be returned to the overflow tank 34 again, or as shown in the figure, it is supplied to a cleaning riser 45 provided at the position where metal A is taken out from the processing liquid, so that the liquid immediately after being taken out is It may be used to wash off any sludge remaining on the surface to obtain a clean treated surface. The riser 45 may be provided not only on the upper surface but also on the lower surface of the metal A. Another cleaning riser 47 is connected to another pipe 46 branched from the pipe 37. This riser 47 is disposed above the metal A just before it is taken out from the processing solution, so that the ejected processing solution can sufficiently reach the metal A and remove the adhering sludge. Thereby, it is possible to prevent the sludge adhering to the metal A from being pressed onto the metal surface by the roll 7. Reference numeral 48 is a lid provided on the tanks 1 and 34, and a duct 49 is installed upright therein.

This duct 49 includes a mechanical liminator 50 and a fan 5.
1 is provided. Therefore, the mist and steam generated in the tanks 1 and 34 are sucked into the duct 49 by the fan 51. The mist is separated and removed by the liminator 50 and collected in the tanks 1 and 34, while the steam is It is discharged outside. By providing this exhaust equipment, it becomes easy to adopt a closed circuit system in chemical conversion treatment that combines multi-stage water washing. Note that the duct 49 is preferably provided near the riser 47 where a large amount of mist is generated. Squeezing rolls (eg 52) may be provided before and after the tank 1. In the present invention having the above configuration, conventionally known chemical conversion treatment liquids may be used, and iron, zinc, aluminum, and various alloys containing these as main components may be used as the metal A material. It's fine.

Next, a specific example of chemical conversion treatment will be given.

After treatment (total acidity 8, acid ratio 8, temperature 7'C) prepared using a commercially available zinc phosphate chemical conversion treatment agent (manufactured by Nippon Paint Co., Ltd. [Granodin 46N-23]), 0.0
．． While conveying a galvanized steel sheet with a thickness of 35 m and 7 IL at a speed of 60 m/m, the infiltration means 3 was moved to adjust the immersion time to 10 seconds to carry out the chemical conversion treatment.

Film amount: 17/m゛. Next, the conveyance speed of the galvanized steel plate was increased to 90
The chemical conversion treatment was carried out in the same manner by changing the dipping time to m/Mm and moving the dipping means 3 to adjust the dipping time to 15 seconds.

Film amount 17/M゜. In this case, the treatment liquid in the tank is approximately 7
It was moved and circulated backward at a speed of 0 m/Mm. As a result, the settled sludge in the tank can be taken out of the system satisfactorily, and the relative speed of the galvanized steel plate to the treatment liquid during immersion is approximately 20 m.
/Mm. The performance of the chemical conversion treated plate obtained in the above example is as shown in Table 1.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing an example of the device of the present invention, and FIG.
The figure is a partially omitted front view showing the main parts of the infiltration means, and FIG. 3 is a partially omitted side view thereof. Support rolls, 6 and 7 are press rolls, 11a and 11b are moving frames, 35 is a riser with a nozzle, and 45 and 47 are cleaning risers.

Claims (1)

[Scope of Claims] 1. A treatment tank i having a predetermined length for storing a chemical conversion treatment solution, and a belt-shaped metal surface that is continuously conveyed horizontally along the length direction above the treatment tank i, and is bent downward. means ii for guiding and immersing the metal surface into the processing solution; means iii for bending and guiding the metal surface horizontally passing through the processing solution to take it out from the processing solution; and moving the immersion means ii and/or the extraction means iii horizontally. means (iv) for relatively approaching or separating the two, and a nozzle attached to the processing tank (i) for spouting the processing liquid so that the processing liquid near the metal surface passing through the immersion flows along the metal surface conveyance direction. A metal surface chemical conversion treatment apparatus comprising a riser means v. 2. The intrusion means ii consists of a combination of a front roll means that supports the metal surface on the processing liquid and a rear roll means that presses it in the processing liquid, and the extraction means iii consists of a front roll means that presses the metal surface in the processing liquid. 2. The apparatus according to item 1 above, comprising a combination of: and a rear roll means supported above the processing liquid. 3. The infiltration means ii can be horizontally reciprocated, and the ejection means ii
The device according to item 1 or 2 above, wherein i is a fixed position. 4. The device according to any one of the above items 1 to 3, wherein each presser roll means of the intrusion means ii and the extraction means iii is movable up and down to a position where the press against the metal surface is released. 5 The nozzle-equipped riser means v has a relative velocity difference of 50 m/m between the metal surface passing through the immersion and the processing liquid near the metal surface.
The first method of spouting the processing liquid in a range below min.
A device according to any of paragraphs 4 to 4. 6 The bottom of the treatment tank i slopes downward toward the rear, and the rearmost bottom becomes a recess to form a sludge collection tank, and the means v
6. The apparatus according to any one of the above items 1 to 5, wherein a riser with a nozzle is arranged on the inclined bottom so as to spray the processing liquid backward. 7. The apparatus according to item 3 above, which is equipped with a cleaning riser that sprays the treatment liquid toward the metal surface immediately before and/or after it is taken out of the treatment liquid.