JPS586974A - Dipping type phosphating device for metallic surface - Google Patents

Abstract

PURPOSE:To provide a titled device which can discharge the sludge settled or going to settle on the bottom of a treating tank concentrically to the outside of the tank by providing means of sucking the treating liquid contg. sludge in the bottom part of the tank and discharging the same to the outside of the tank while moving said liquid. CONSTITUTION:The sludge settled or going to settle in the semicircular shape on the porizontal bottom 1a of a treating tank 1 of a dipping type phosphasting device for metallic surfaces is sucked together with treating liquid through a suction port and is discharged to the outside of the tank 1 through horizontal pipes 5b, upright pipes 5a and pipes 8. The treating liquid separated by a sludge separator is returned to the tank 1 or an overflow tank 4 according to need. Plural branch pipes 14 with values are provided to a main pipe 13 connected to the discharge side of a pump 12, and the treating liquid is ejected in the direction of the bottom 1a through the risers 15 connected to the leading ends of the pipes 14 to move and concentrate the sludge settled on the bottoms 1b, 1c to the bottom 1a. The pipes 5b are moved in a semicircle shpape around pipes 5a to suck the treating liquid through the plural suction ports provided on the circumferential surfaces of the respective pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an immersion type phosphate metal surface treatment apparatus, and more particularly to an apparatus suitable for continuous treatment of automobile bodies.

When metal surfaces are treated with phosphate using the immersion method, a large amount of sludge mainly composed of insoluble phosphate compounds is produced in the treatment tank, so this must be properly drained out of the tank.
The generated sludge adheres to the object to be treated and causes processing defects, complicating the subsequent washing process and causing coating defects. For example, in surface treatment of automobile bodies, the sludge content of the treatment liquid in the tank must be approximately 300 PPm or less. To this end, it is conceivable to circulate the treatment liquid inside and outside the treatment tank and use this to subject all the treatment liquid to offshore treatment at appropriate intervals to separate the sludge. Width 2800mm, maximum length 25000++ as used for continuous processing
++n, depth 3000 rIn, capacity 120 m3, processing liquid circulation rate 10000 l/min master type actual device, utilizing this circulating processing liquid and providing an r filtration device for that purpose will target a large amount of processing liquid. However, there are problems in terms of the throughput capacity and the ability to treat fine sludge by r, so it is difficult to provide a practical solution.

By-product sludge generally settles to the bottom of the treatment tank, but
When the material to be treated is subjected to immersion treatment while being conveyed continuously, settled sludge is accumulated on the outlet side of the treatment tank as it is conveyed. When the amount increases, the sludge comes into contact with the object to be treated and is taken out of the tank together with the object, causing processing defects as described above. In order to solve this problem, a recess for sludge accumulation is formed at the bottom of the treatment tank, and a portion of the treatment liquid is injected toward the settled sludge, causing the sludge to flow into the recess. A technology has been provided to intensively discharge this out of the tank by moving and accumulating it (Utility Model Application No. 54-157918).
However, according to this technology, the settled sludge tends to be redispersed in the liquid due to the fine particle nature of the sludge, the transportation of the material to be treated in the bath, the jetting out of the treatment liquid for accumulation, etc. A force that allows good accumulation within the recess! It was found that it was difficult to take out of the tank from the concave portion a treatment liquid with an amount of 11,000 pp or more of sludge, which is considered necessary to efficiently separate the sludge.

An object of the present invention is to solve the problems of the disclosed technology and to intensively discharge the sludge that has settled to the bottom of the tank or is about to settle out of the tank without providing the above-mentioned sludge accumulation recess in the treatment tank. The object of the present invention is to provide a device that does this.

That is, the present invention provides an immersion type phosphate metal surface treatment apparatus characterized in that a means is provided in the treatment tank for sucking the treatment liquid containing sludge and discharging it to the outside of the tank while moving the bottom portion of the tank. Pertains to.

Next, the present invention will be specifically described with reference to the accompanying drawings. It should be noted that although the illustrated apparatus is suitable for continuous processing of the object to be processed, it should be understood that the present invention is not limited to this only, but can also be effectively employed in non-continuous processing. No.

In Figures 1 and 2, 1 is an immersion treatment tank;
The matrix is suitable for immersion treatment of the workpiece 2 while being continuously conveyed by the conveyor 3. In the present invention,
In addition to this matrix, a box-shaped processing tank may be used. Reference numeral 4 denotes an overflow tank attached to the inlet side of the processing tank 1, and its installation position may be selected as appropriate, and it may not be installed if unnecessary.

Reference numeral 5a denotes a standpipe provided close to one side wall of the processing tank 1, and is rotatable about its vertical axis by a drive device 6 connected by conventional means to its upper part above the processing liquid level. It is located.

5b is a horizontal pipe connected to the lower end of the vertical pipe 5a, which is located at a predetermined height (for example, 50 to 100 mm) along the horizontal tank bottom 1a of the processing tank 1, and extends along the width direction of the processing tank 1. It has a shorter length than the sakura.

Therefore, the horizontal pipe 5b moves to the second position according to the rotation of the vertical pipe 5a.
As shown in the figure, it moves back and forth in a semicircular shape. The speed of this movement is determined by the amount of sludge settling on the horizontal tank bottom 1a (it is preferably a force that does not re-disperse the settled sludge into the liquid), and is usually at the tip of the horizontal pipe 5b (at a force of 0.
The speed may be about 5 to 5 m/min. A plurality of ports are provided on the circumferential surface (particularly the lower surface) of this horizontal tube for sucking the sludge together with the processing liquid. On the other hand, the upper end of the standpipe 5a is connected to a pipe 8 through an ordinary swivel joint 7, the chain pipe 8 is connected to the suction side of a pump (not shown), and the discharge side is connected to a sludge sorting device (for example, is connected to a continuous cellar (IJ song) and a sludge dewatering device (not shown).

Therefore, the sludge that has settled or is about to settle in the semicircular shape shown in FIG.
, and is discharged to the outside of the tank via pipe 8. The treatment liquid separated by the sludge sorting device may be returned to the treatment tank 1 or the overflow tank 4 as required.

Depending on the shape and size of the horizontal tank bottom 1a of the processing tank 1, one or more sludge-containing processing liquid discharge means having such a configuration may be provided as shown in the figure. Further, the discharge means is not limited to a treatment tank having a flat tank bottom as in this example, but may be applied to a treatment tank having a sludge accumulation recess in the tank bottom as disclosed in the above-mentioned prior art.

A valved pipe 11 for taking out a part of the processing liquid is connected to the overflow tank 4, and the other end is connected to a pump 12.
connected to the suction side of the If the overflow tank 4 is not installed, the chain pipe 11 may be connected to the processing tank 1 at any position other than the bottom of the tank. A main pipe 13 is connected to the discharge side of the pump 12, and a plurality of branch pipes 14 with valves are connected to this main pipe 13. At the tip of each branch pipe 14, there is a front and back inclined tank bottom 1b, 1' of the outgrowth part of the processing tank 1.
Each of the risers 15 is connected to the riser 15 located at c.

Each riser 15 is provided with an appropriate number of nozzle holes (not shown) so as to eject the processing liquid in the direction of the arrow in the figure, that is, toward the horizontal tank bottom 1a. Due to the spouting of the treatment liquid, the sludge that has settled on the inclined tank bottoms 1b and lc can be moved and accumulated on the horizontal tank bottom 1a. The form and arrangement of each riser 15 are designed to efficiently move settled sludge to the horizontal tank bottom 1a, taking into account the spouting state of the processing liquid from the nozzle hole.
It may be selected as appropriate based on the points that can be accumulated. In the case shown in the figure, straight risers having a length spanning the entire width of the processing tank 1 are arranged in parallel at appropriate intervals.
The arrangement interval is preferably 500 to 10,001 rrIn, for example in the above-mentioned actual device for automobile bodies, and in this case, the treatment liquid ejected from the nozzle holes is 20 mm per nozzle hole.
A discharge rate of ~50 I/min is preferred.

Further, in this example, another riser 15' similar to the riser 15 is provided on the branch pipe 14 in a part of the horizontal tank bottom 1a. It is advantageous to install this when a portion outside the movement range of the horizontal pipe 5b is formed on the horizontal tank bottom 1a as shown in FIG. That is, an appropriate number of risers 15' may be arranged with the nozzle holes (not shown) facing within the range of motion of the horizontal tube 5b. As a result, the sludge that settles in this area and the sludge that is moved to the horizontal tank bottom 1a by the riser 15 on the inclined tank bottom is satisfactorily moved within the movement range of the horizontal pipe 5b, and the horizontal pipe number It is discharged outside the tank. The operating conditions of this riser 15' are selected according to those of the riser 15).

FIG. 3 is a drawing showing another specific example of the present invention.

In particular, this is an example in which, in place of the sludge-containing treatment liquid discharge means having the above-mentioned vertical pipe 5a and horizontal pipe 5b, a means having another structure is adopted. That is, the standpipe 25a is connected to the processing tank 1.
Although it is installed close to one side wall of the tank 1a, it is arranged so as to be able to reciprocate along the length direction of the processing tank 1 along the horizontal tank bottom 1a by means of a normal conveyance means 26i. horizontal pipe 5
The horizontal pipe 25b, which has a block suction port similar to b, is the vertical pipe 25.
It is connected to the lower end of a and extends along the width direction of the processing tank 1 at a predetermined height like the horizontal pipe 5b, and its tip +i is connected to the support pipe 25C provided close to the other side wall of the processing tank 1. connected. The upper end of this support pipe 25Cζ is the same as the standpipe 25a! Here, it is supported by a conveying means 26. On the other hand, the upper end of the standpipe 25a is connected to a flexible pipe 27 such as a rubber hose instead of a swivel joint.
Furthermore, the configuration is similar to that of FIG.

Therefore, the horizontal pipe 25b discharges the sludge-containing processing liquid out of the tank while reciprocating the entire horizontal tank bottom 1a along the length of the processing tank 1 in accordance with the movement of the horizontal pipe 5b. Therefore, there is no need to provide a riser 15' as shown in FIG.

The apparatus shown in FIG. 4 is yet another embodiment of the invention. That is, 16 is a means that forms a passage for the processing liquid with an inclined piece, and the processing liquid is ejected from the horizontal pipes 5b, 25b and risers 15, 15' of the discharge means to drain the processing liquid into the processing tank l. It is located close to the tank bottom at a location above the zone of flow of processing liquid occurring at the bottom. Said means 16
An example is shown in FIG. In this example, the inclined piece is a plate body 17 having a length spanning the entire width of the processing tank l, within a range that does not impede the movement of the stand pipes 5a, 25a and support pipe 25C of the discharge means, and this plurality of pieces can be arranged as appropriate. A processing liquid passage 18 is formed by arranging them in parallel at intervals. 19 is a member for connecting and fixing each inclined plate 17. The inclination of the inclined plate may be a right angle or an acute angle, preferably 20 to 90 degrees, to the flow direction of the processing liquid in the zone. As a result, the sludge accompanying the processing liquid flowing between the means 16 and the tank bottom is suppressed from going beyond the means 16 and redispersing into the liquid above, and the sludge that settles is prevented from passing through the passage. 18 so that it is satisfactorily included in the flow of processing liquid below. Generally, the slope of the slope plate 17 is the longitudinal slope of the tank bottom 1b.

For IC, it is preferable to have an acute angle, and the horizontal tank bottom 1
A is preferably at right angle. Therefore, the means 1
6, it is practical to arrange them in multiple blocks depending on the condition of the tank bottom. Of course, the means 16 should be made of a material (e.g. stainless steel) that is sufficiently resistant to corrosion by the phosphate treatment solution, so that it is sufficiently resistant to the accidental drop of the object to be treated. Needless to say, it has sufficient strength. In addition, it is practical to have a weight and structure that allows for easy removal in case of maintenance of the treatment tank or riser.

The inclination angle, arrangement interval (processing liquid passage interval), height, distance between the inclined piece (for example, the inclined plate 17), the height, and the interval between the tank bottom and the tank bottom are determined depending on the shape of the processing tank, the amount and nature of settled sludge, and the treatment in the above zone. It may be appropriately selected based on the flow state of the liquid, the movement mode of the discharge means, etc. within a range that does not impair its function. For example, in the case of an actual device for the above-mentioned automobile body, the above-mentioned inclination angle may be 20 to 90 degrees.

If this angle is too small, the settling sludge will accumulate on the ramp itself and will not be satisfactorily included in the flow of processing liquid downward through the processing liquid passageway. On the other hand, if the angle is obtuse, a portion of the downward flow of the processing liquid will flow upward through the processing liquid passage, leading to redispersion of the sludge into the liquid. A preferred angle is 40 to 60 degrees. The above arrangement interval may be about 10 to 120 mm. If it is too narrow, the treatment liquid passageway will often be blocked by settling sludge, while if it is too wide, it will be difficult to achieve the purpose of installing this inclined piece, both of which are undesirable. The preferred arrangement interval is 50 to 9 ON++.・
The above height should be at least 50III+1; if it is too low, the effect of suppressing redispersion of settled sludge into the liquid above the means will not be satisfactorily exhibited;
On the other hand, if the gap is too high, the capacity of the processing tank must be increased in order to prevent contact between the object to be processed and the means being immersed, which is impractical. The preferred height is 100-20
It is 0m. The distance between the tank bottom and the tank bottom is at least 50m.
If the gap is too narrow, it will not be possible to secure a space for the flow zone of the treatment liquid below, leading to turbulence in the flow and redispersion of the settled sludge into the liquid. Moreover, the movement of the ejecting means is hindered. On the other hand, if the width is too wide, it becomes necessary to increase the capacity of the processing tank in order to prevent contact between the object to be processed and the means, which is impractical. The preferred interval is 100-200TrrI
It is n.

Next, an example of this immersion treatment will be shown using a model of the apparatus shown in FIG.

Width 500Wn, maximum length 2000+++m, depth 100m
Use matrix-treated cypress with a capacity of 0.0 mm and a capacity of 1000/cm. Stand pipes 5a, 25a and horizontal pipe 5 of sludge-containing processing liquid discharge means
Both b and 25b are moved using a 25A pipe with a total discharge volume of 1017 m1n, and the sludge removal treatment liquid is returned to the treatment tank. The arrangement interval of the inclined plates 17 in the means 16 is 70 mm, and the height is 150 mm.

The inclination angle is inclined tank bottom 1b, 60 degrees at IC, horizontal tank bottom 1a
It is 90 degrees. The distance between the tank bottom and the means 16 is 300
It's my friend. In the treatment tank, a zinc phosphate treatment tank containing 500 PPm of sludge ("Granodin 5D2ooo" manufactured by Nippon Heint Co., Ltd.) was used, and the treatment liquid circulation rate was 7Q.
lj/min, flow Q of treatment liquid at the bottom of the tank, 8 m/s
ec, and measured the amount of sludge at the middle depth of the center of the treatment tank after 2 hours of continuous treatment (treatment amount: 60 d). The results are shown in Table 1 in relation to the discharge means and various aspects of the presence or absence of the inclined piece.

As is clear from the above results in Table 1, the amount of sludge in the bath is reduced by approximately half by installing the discharge means, and when the installation of the inclined piece is further combined, the amount of sludge is significantly reduced. There is virtually no significant difference due to the difference in the type of ejection means. Due to the combination of the discharge means and the inclined piece, almost no sludge accumulates at the bottom of the tank.

[Brief explanation of the drawing]

Fig. 1 is a simplified sectional view showing an example of an integrated body of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a simplified sectional view showing another specific example, and Fig. 4 is a simplified sectional view showing yet another specific example. FIG. 5 is a partial perspective view showing a specific example of an inclined piece, in which 1 is a processing tank;
4 is an overflow tank; 5a and 25a are vertical pipes of the sludge-containing treatment liquid discharge means; 5b and 25b are horizontal pipes thereof; 1
5.15' indicates a processing liquid ejecting means, and 16 indicates an inclined piece. Patent applicant: Nippon Paint Co., Ltd. Representative patent attorney Aoyama Hogai (1 person)

Claims (1)

[Claims] 1. An immersed phosphate metal surface, characterized in that a means is provided in the treatment tank for suctioning the treatment liquid containing sludge and discharging it to the outside of the tank while moving along the bottom of the tank. Processing equipment. 2. The discharge means includes a standpipe that is rotatable about a vertical axis provided close to the side wall of the processing tank, and is connected to the lower end of the standpipe and is located at a predetermined height from the horizontal tank bottom. It also has a horizontal pipe that moves semicircularly around the upright pipe and has a plurality of suction ports on its circumferential surface, and sucks the sludge-containing treatment liquid in the tank through these horizontal pipes and the upright pipe. 2. The device of item 1 above, which is configured to discharge to the outside. 3. The apparatus according to item 2 above, wherein a treatment liquid jetting means for moving the sludge into the movement range is provided at the bottom of the horizontal tank outside the movement range of the horizontal pipe of the discharge means. 4. The discharge means includes a standpipe that is provided close to the side wall of the processing tank and is capable of reciprocating along the length of the processing tank, and a standpipe connected to the lower end of the standpipe from the bottom of the horizontal tank. It has a horizontal pipe located at a predetermined height, extending along the width direction of the treatment tank, and provided with a plurality of suction ports on its circumferential surface, and drains the sludge contained in the tank through these horizontal pipes and vertical pipes. The apparatus according to item 1 above, which is configured to suck the processing liquid and discharge it to the outside of the tank. 5. The treatment tank is in the form of a mother mold, and a discharge means is provided on the horizontal tank bottom, and a flow of treatment liquid is formed on the front and back inclined tank bottoms to move the sludge in the relevant part to the horizontal tank bottom. 6. The apparatus according to any one of the above items 1 to 4, which is provided with a treatment liquid spouting means for discharging the treatment liquid. 7. The apparatus according to item 5 above, which is provided with means for forming a passage for the processing liquid with an inclined piece that is inclined at an angle perpendicular or acute to the direction of the flow. The device according to item 6 above, which is constituted by passage means or a plurality of plate bodies having a predetermined length in the width direction of the processing tank arranged in parallel at a predetermined interval.8. The apparatus according to any one of the above items 5 to 7, which performs the immersion treatment while being conveyed to the apparatus.