JPS6144185A - Chemical conversion treating device for metallic surface - Google Patents

Abstract

PURPOSE:To prevent the defect of a chemical conversion treatment by covering substantially the entire part of an immersion treating tank of a chemical conversion treating device for a metallic surface and preventing the dropping of the drippings of the condensed treating liquid to the untreated part of the metal to be introduced into the treating tank. CONSTITUTION:The treating tank 1 having the prescribed length to contain the chemical conversion treating liquid 2 is provided and an intruding means 11 for curving and guiding downward the surface of the belt-like metal A to be conveyed continuously in the longitudinal direction thereof and intruding said metal into the treating liquid is provided to the upper part thereof. A means 12 for curving and guiding upward the surface of the metal under the immersion and passage through the inside of the treating liquid 2 and taking the metal out of the treating liquid 2 is provided to the rear end of the tank 1. The means 11 is made horizontally movable in the longitudinal direction of the tank 1. A cover body 17 is provided between the front end of the tank 1 and the means 11 and a cover body 18 is provided between the means 11 and the means 12. These cover bodies move according to the movement of the means 11 so as to cover the surface of the treating liquid 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal surface chemical conversion treatment AA system, more specifically, a method for chemically converting a metal strip by a dipping method while continuously conveying it, and for dipping the metal surface. The present invention relates to a processing device whose length can be freely changed.

[Prior Art] Conventionally, as an example of this type of device, Japanese Patent Application Laid-Open No. 56-629
Examples include those described in No. 67. By the way, in this apparatus, since the entire immersion treatment tank is covered with a lid, the treatment liquid may condense on the inner surface and fall as drops. If the untreated part of the metal in this equipment (i.e., the part between the treatment tank population and the time it enters the treatment solution) is long, the droplets may fall on that part, resulting in chemical conversion treatment defects. . Since high-speed processing is generally employed in this type of apparatus, the metal passing through the immersion floats to the surface of the processing liquid, and its surface may be exposed, resulting in a defective chemical conversion treatment. In order to solve this problem, in the above-mentioned conventional apparatus, a riser with a nozzle is arranged on both side walls and/or the bottom of the processing tank, and the processing liquid is spouted backward, so that the processing liquid near the metal passing through the immersion is aligned with the metal transport direction. They are moved in the same direction to reduce the relative speed difference between the metal and the processing liquid. However, in the conventionally known treatment liquid injection structure, the metal passing through the immersion tends to meander in a horizontal plane, and therefore floats above the treatment liquid surface, which may lead to a defective chemical conversion treatment.

[Object of the Invention] The object of the present invention is to sufficiently cover the entire immersion treatment tank of a metal surface chemical conversion treatment equipment, and to prevent drops of condensed treatment liquid from falling onto the untreated portion of the metal introduced into the treatment tank. The object of the present invention is to provide a device that can prevent this.

Another object of the present invention is to provide an apparatus that can more effectively prevent the metal passing through the dipping from floating up from the treatment bath during high-speed dipping treatment of a strip of gold.

Still other objects of the present invention will be described as appropriate in the following description.

[Structure of the invention]

The gist of the invention is as follows.

(1) A treatment tank (+) of a predetermined length that accommodates a chemical conversion treatment solution;
Processing f! (i) Means (+1) for bending and guiding the band-shaped metal surface continuously conveyed upward along its length downward and penetrating the processing liquid; installed at the rear of the processing tank f(i); The means (...) for bending and guiding the metal surface immersed in the treatment liquid and taking it out from the treatment liquid, and the means (ii) for moving the intrusion means (ii) horizontally along the length direction of the treatment tank (i). Means (1v) is arranged between the front end of the treatment tank (i) and the intrusion means (ii) and between the metal surface and the treatment liquid surface, and
i) a cover body (V) that covers the processing liquid surface according to the movement of the
and a cover body (vi) disposed between the intrusion means (1) and the extraction means (...) and above the processing liquid level, and covering the processing liquid level according to the movement of the intrusion means (ii). Metal surface chemical conversion treatment equipment.

(2) A riser equipped with a plurality of nozzles is attached below the liquid level on both sides of the processing tank (1), and the filtration processing liquid is sprayed downward inside the processing tank (1), The apparatus according to item 1 above, which forms a flow of processing liquid in the same direction as the metal surface conveyance direction in the vicinity of the metal surface that is being immersed.

(3) The entry means (ii) consists of a combination of a front roll means that supports the metal surface above the processing liquid and a rear roll means that holds it down in the processing liquid, and the extraction means (iii) consists of a combination of a front roll means that supports the metal surface above the processing liquid and a rear roll means that holds the metal surface in the processing liquid. The apparatus according to item 1 above, comprising a combination of a front roll means for pressing and a rear roll means for supporting above the processing liquid.

(4) The device according to item 1 above, wherein the cover bodies (V) and (vi) are extendable bellows-type cover bodies having both side walls.

[Example] Next, a specific example of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes an immersion treatment tank, which may be a box-shaped rack having a predetermined length as shown in the figure, and contains the chemical conversion treatment liquid 2. A is a band-shaped metal that is continuously conveyed along the length direction of +ffl, and is conveyed on the front side of the tank 1 (the left side in the drawing), for example, by the squeezing roll means 4 of the surface conditioning device 3, and then by the exhaust gas. After passing through the ducted chamber 5, it is fed into the tank and immersed. The metal A that has passed through the treatment liquid 2 in a horizontal state is taken out from the treatment liquid at the rear side of the tank 1, and then is subjected to extra treatment by the squeezing roll means 8 while passing through the chamber 7 of the water washing device 6, for example. The liquid is removed and washed with water.

The means for introducing the metal A into the processing solution (hereinafter referred to as a moving unit) and the means for removing it from the processing solution are indicated by 11 and 12, respectively, and the former is arranged horizontally along the length direction of the processing tank 1. The latter are movable and the latter are fixed in position. The moving unit 11 includes a roll I3 that supports the metal A above the processing liquid in front of the entry position, and the roll 13.
It basically consists of a roll 14 which is located behind the metal and which bends and guides the metal downward so that it enters the metal and then holds it down in the processing liquid. The take-out means 126 basically consists of the roll I4
It is constituted by a front presser foot 15 corresponding to the roll I3 and a rear support roll 16 corresponding to the roll I3. Metal A immersed in the treatment liquid by rolls 14.15 is
It only needs to be located within the range of to-100 below the liquid level,
Therefore, the diameters of the rolls 13, 14, 15, and 16 may be appropriately selected. The respective distances between the rolls 13 and 14 and between the rolls 15 and 16 may be such that the metal forms an angle with respect to the rolls 14 and 15 without slipping during entry and removal thereof. The above roll + 3.14.15.16 has excellent chemical resistance and is easy to clean.For example, A11 is made of commercially available neoprene (
Polychloroprene) and Hypalon (fluorosulfonated polyethylene) are suitable, and their hardness is 40 to 80.
It is best to have a moderate amount of water.

For example, to describe the case of moving unit II in more detail, both rolls 13 and 14 are made of neopreno with a diameter of 400u, and the distance between their rotational axes is set to 1.
200 am, the penetration angle of metal A is 40 degrees with respect to the liquid level, and a design may be adopted in which the passing position of gold l1iA is 50 am below the liquid surface.

Of course, it will not be stated unless specifically explained that a similar design may be adopted for the extraction means I2. In addition, roll +
Regarding 3.14.15.16, by using a roll commonly known as a crown roll,
This is advantageous in that it is possible to prevent the gold jliiA from meandering in the horizontal plane.

Reference numerals 17 and 18 are bellows-type cover bodies that expand and contract as the moving unit 11 moves, as shown in FIG. 2, for example. 17 is attached at one end to the front end of the treatment tank 1 (or to the surface conditioning device 3 in front of it) and at the other end to the moving unit 11, especially below the roll 13, and is Gold rAA and processing solution 2
It is installed so that it is located between the liquid level. 18 is attached at both ends to the moving unit 11 and the exhaust duct-equipped lid 19 of the flat extraction stage I2, and is located above the liquid level of the processing liquid 2. As shown in FIG.
0.20, and the wall has an upper edge 21.21 of the processing tank 1.
It is preferable that it be in contact with. In addition, the cover members 17 and 18 may be made of any material that is generally chemical resistant and durable for expansion and contraction, and may be made of, for example, a plastic material.

By installing the cover body 17.18 in this way,
Not only can the effect of covering the processing liquid surface (e.g., prevention of scattering of processing liquid vapor) similar to the above-mentioned conventional device be achieved, but also the cover body 17 can prevent drops of processing liquid from condensing on the metal A before immersion (untreated). can be prevented from falling from the cover body, and the problem of causing defects in chemical conversion treatment in the conventional apparatus described above can be solved.

The details of the moving unit It are as shown in FIGS. 3 to 5. The rolls 13, 14 are rotatably supported on both sides by frames 30a, 30b. The frame 30a has wheels 31a rotatably attached thereto,
It is movably supported on rail 33a by 32a. The surface of the rail 33a is finished at a right angle, and the wheels 31
It is desirable that the gap between a and the brim of 32a is adjusted to 005■ or less. Further, it is desirable that the rail 33a is adjusted and installed so that its horizontality in both the width direction and the length direction is 0.05 mm or less/m. 34a
is a guide frame provided on the frame 30a, and includes a guide roll 35a.

36a is rotatably provided, and these guide rolls are connected to a guide rail 37 attached to the back surface of the rail 33a.
It is possible to run on a. Guytrol 35a, 3
6a and the guide rail 37a are used to prevent the moving unit 11 from floating due to the tension of the gold (maximum approximately 1500 kg)! 1 to 1, and it is preferable that the gap opening between the two be adjusted to J71 or less than Q and 1 mm. To this end, it is recommended to use eccentric cam lock type rolls known per se for the guide rolls 35a and 36a.
It's f-ri. Both ends of a chain 38a are attached to the frame 30a, and the chain 38a is hung on a pair of sprockets 39a and 40a (only one shown) spaced apart to ensure the required distance for horizontal movement of the moving unit 11. is a passing. The other frame 30b also includes members 31b to 4 corresponding to the members of the frame 30a.
0b (partially not shown) is arranged and the same mechanism is adopted. The sprockets 39a and 39b are supported by the same rotating shaft, and this rotating shaft is connected to the drive shaft of an electric motor 42 with a reduction gear 41.

By employing the moving unit 11 having the above configuration, it is possible to solve the problems of meandering of the metal A and lifting of the intrusion means that occur when the rack type mechanism is employed in the conventional apparatus. According to the above configuration, the manufacture is simpler than the above-mentioned conventional device, smooth movement can be ensured, and maintenance and inspection can be facilitated since the drive section and the like are not covered.

Reference numeral 50 denotes a riser for circulating the processing liquid 2, and is installed horizontally at least 200a+n+ below the metal A being immersed and passing, and in parallel at a distance of about 50 to 100111i from both side walls of the tank I. This riser 50 is provided with a plurality of nozzles 51, and their installation states are shown in FIGS. 6 and 7.
As shown in the figure, 35 to 6 in the length direction of the riser 50.
It faces rearward (toward the loading port) at an angle of 0 degrees, preferably 40 to 50 degrees, and is oriented at an angle of 35 to 50 degrees to the liquid level (horizontal).
It points downward at an angle of 60 degrees, preferably between 7IO and 50 degrees. In addition, especially if the mounting state of the nozzle 51 is changed so that the angle with respect to the liquid surface becomes smaller and becomes closer to parallel to the liquid surface, the processing liquid injected from the nozzle 51 collides in the center of the tank 1, causing turbulent flow. In order to cause this, the gold gAA becomes unidirectional and meandering. 52 is another riser provided on the tank population side on the +iii side of the riser 50, and is installed in the same manner as the riser 50 except that it is placed in a direction perpendicular to the riser 50. Further, the plurality of nozzles 53 provided on the riser 52 sequentially change their angles so that the closer they are to the center of the riser 52, the more they face rearward in a direction perpendicular to the riser, and similarly to the nozzle 5J, the nozzles 53 face downward. It is provided. The nozzle 51.53 usually has a diameter of about 5 to 1O1lllR and is 2nil 50Q/
A pipe nozzle may be used which provides a flow m of
Pop pressure 08-2? The processing liquid may be injected at a pressure of /cx'G.

By adopting such a riser and nozzle arrangement,
The treatment liquid 2 in the tank is applied along the conveyance direction of the gold 171A, and the metal is smoothly conveyed without meandering or floating on the surface of the treatment liquid.

Reference numeral 54 denotes an overflow tank provided on the outlet side of tank 1, and the processing liquid stored in this tank is passed through pipe 55 to receiving tank 5.
It is set back to 6. The processing liquid in the receiving tank 56 is supplied to the riser 50.degree. 52 via a pipe 58 by a pop 57, and is circulated and sprayed into the tank. Note that, if necessary, a heat exchanger or a filter may be incorporated in the circulation path of the processing liquid or in a separate path.

The moving unit 11 may be automated to move by employing a conventional relay circuit and to automatically change its immersion length according to the line speed of the metal A and the set processing time. The details are as shown in FIG.

That is, the processing time setter 60 converts the immersion length into a signal based on the line speed setting signal and the set processing time, and sends this signal to the comparison deviation calculation circuit 61. This circuit 61 compares the moving unit position signal and the moving speed signal sent from the arithmetic circuit 62, detects the difference between the moving unit position and the required immersion length, and sends the moving speed signal to the electric motor 42. . The rotational force of the electric motor 42 rotates the sprocket 39a through the reducer 41 as described above, and thereby the moving unit 11 through the chain 38a.
moves. Further, the rotation of the electric motor 42 is transmitted to the Cernon 66 via other sprockets 63a, 63b, a chain 64, and a reduction gear 65. At Cernon 66 (hyperactive distance and movement speed are detected by rotation angle signal and current signal,
These are sent to the arithmetic circuit 62. In the performance n circuit 62,
The angle signal and current signal are converted into a position signal and a moving speed signal of the moving unit, and the signals are transmitted to the comparison deviation calculation circuit 61. The movement of the moving unit is calculated by the comparative deviation calculation circuit 61 so that the moving unit accelerates at a rate of 0.3 m/min/sec and travels at a maximum speed of 10 m/min. Also, the deceleration is reduced to 0 when the required immersion length is 1 m (for example, 30 degrees with the angle signal) remaining.
It is carried out at a speed of 3 m/min/shaft, and the moving unit is stopped at a predetermined position and then fixed in that position by a brake. After moving and fixing the moving unit, the actual money v
If the conveyance speed of 4A is within ±5% of the line speed setting value, the moving unit will not move again.
The jitter phenomenon is controlled so as not to occur.

The immersion time of this device is determined by combining the line speed and immersion length to obtain the required chemical conversion coating level, taking into account the material of metal A, the type and performance of chemical conversion treatment liquid 2, etc. You can set J2 as appropriate. In this apparatus, the length of the immersion rr' controlled by the line speed and immersion time (11) was determined as shown in Table 1 below.

Table 1 Also, the results of the actual chemical conversion treatment were as follows.

Gold 17JA hot-dip galvanized steel strip chemical conversion treatment liquid/Nippon Paint Co., Ltd. Zinc phosphate chemical conversion treatment agent [
Granodin ZD9200 (total acidity 13, acid ratio 13, temperature 65°C) Chemical conversion film fik (9/s') + Chemical conversion film appearance uniform and dense, no chemical formation unevenness such as under Uji [Effects of the invention] As described above, the present invention equipment Accordingly, it is possible to prevent drops of the condensed chemical conversion treatment liquid from falling on the fully curved untreated portion, and there is no risk of causing defects in the chemical conversion treatment. Moreover, it is possible to prevent the metal being immersed in the treatment from floating to the liquid surface and causing defects in the chemical conversion treatment.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an example of the device of the present invention, FIG.
The figure is a partial side view showing details of the moving unit.
The figure is a sectional view taken along line IV-IV in Figure 3, and Figure 5 is a cross-sectional view taken along line IV-IV in Figure 3.
FIG. 6 is a partially enlarged view of the figure, FIG. 7 is a partial plan view of the treatment area, FIG. 7 is a cross-sectional view thereof, and FIG. , ■ is an immersion treatment tank, 2 is a chemical conversion treatment liquid, 11 is an intrusion means (Muhinogu unit), 12 is an extraction means, + 7.18 is a cover body, 5
0.52 indicates riser. Patent Applicant Nippon Paint Co., Ltd. Representative Patent Attorney Haka Aoyama 1 person Figure 2 @ Ward 3 Figure 4 Figure 5 Figure 7 Figure 6

Claims (4)

[Claims] (1) A treatment tank (i) of a predetermined length that accommodates a chemical conversion treatment solution;
A means (ii) for bending and guiding the strip-shaped metal surface continuously conveyed above the processing tank (i) along its length downward to enter the processing solution; The means (iii) for bending and guiding the metal surface that is installed and passing through the processing solution by bending upward to take it out from the processing solution, and the means for entering (ii) are moved horizontally along the length direction of the processing tank (i). means (iv) for causing the intrusion (i) to be disposed between the front end of the processing tank (i) and the intrusion means (ii) and between the metal surface and the processing liquid surface;
i) a cover body (v) that covers the processing liquid surface according to the movement;
and a cover body (vi) disposed between the intrusion means (ii) and the extraction means (iii) and above the processing liquid level, and covering the processing liquid level according to the movement of the intrusion means (ii). Metal surface chemical conversion treatment equipment. (2) A riser equipped with multiple nozzles is attached below the liquid level on both sides of the processing tank (i), and the circulating processing liquid is sprayed toward the rear inside the processing tank (i) and downward, thereby immersing the tank. The apparatus according to item 1 above, which forms a flow of processing liquid in the same direction as the metal surface conveyance direction in the vicinity of the metal surface being passed. (3) The intrusion means (ii) consists of a combination of a front roll means that supports the metal surface above the processing liquid and a rear roll means that holds it down in the processing liquid, and the extraction means (iii) The apparatus according to item 1 above, comprising a combination of a front roll means for pressing and a rear roll means for supporting above the processing liquid. (4) The device according to item 1 above, wherein the cover bodies (v) and (vi) are extendable bellows-type cover bodies having both side walls.