JPS63761Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an immersion type phosphate chemical treatment apparatus. More specifically, the present invention relates to an improvement in a treatment tank which is particularly suitable for continuous immersion treatment of large products such as automobile bodies, and which can advantageously discharge sludge produced in the tank to the outside during treatment.

When a metal surface is subjected to phosphate chemical conversion treatment using an immersion method, a large amount of sludge containing an insoluble phosphate compound as a main component is produced as a by-product in the treatment tank. For example, this sludge is used in a treatment bath in the treatment of automobile bodies.
If more than 300 ppm exists, it will cause surface treatment defects such as dust defects and lump defects due to sludge.
Usually, various methods are used to discharge by-product sludge out of the tank. One method is to allow the by-product sludge to settle to the bottom of the tank due to its own weight, and to discharge it to the outside of the tank along with a portion of the treatment liquid. A basic device for carrying out this method is shown in FIG.
That is, a plurality of recesses 2 in the shape of an inverted truncated pyramid are provided in the entire bottom of the treatment tank 1, and a pipe 5 having a pump 4 is connected to the lower end of each recess as a sludge discharge port 3. The sludge is taken out of the tank along with a portion of the treatment liquid and filtered through a filter 6, and the filtrate is returned to the treatment tank 1 through a pipe 7. In a treatment tank having this structure, the settling angle of the inclined surface of the recess is set to be equal to or larger than the angle of repose of the sludge, thereby accumulating the settling sludge in each recess. However, if such a treatment tank structure is adopted for the immersion treatment of automobile bodies, and the recesses are provided so that one side of the inner upper end of each recess spans the entire length (approximately 3 m) in the width direction of the treatment tank, only the depth of the recess is provided. However, it is approximately 3 meters long, and when you include the depth of the treatment tank itself, it is necessary to install equipment with a considerable depth. Generally, when such equipment is installed in a factory, it is necessary to dig a large pit into the building foundation because of building regulations. Therefore, installation of the device requires a large amount of cost and a long period of time, which is economically disadvantageous. In addition, since the capacity of the entire tank becomes large, it is economically disadvantageous in preparing a bath for processing liquid. In order to eliminate this disadvantage, it has been adopted to reduce the depth of the recess. That is, as shown in FIG. 2, a large number of small shallow recesses 12 are provided over the entire bottom of the tank. According to this structure, the above-mentioned disadvantages of the device shown in FIG. A new problem arises in that it becomes difficult to smoothly remove the liquid from the tank together with a part of the liquid. Further, as shown in FIG. 3, a recess 23 is provided at the bottom of the treatment tank 1 on the inlet side or the outlet side, and the sludge-containing treatment liquid discharged from the sludge outlet 23 is filtered through the filter 6. After filtering the sludge, a plurality of spray risers 8 are connected to the pipe 7 and placed at the bottom of the tank.
The processing liquid is supplied to the recess 22 from this point, and the sludge that has settled at the bottom of the tank is moved and accumulated in the recess 22. According to this, it is advantageous in terms of the device structure that there is only one recess, but there is a high possibility that the settled sludge will fly up due to the ejection of the treatment liquid from the riser 8 and be redispersed in the liquid, and therefore it will not flow into the recess. The problem is that the effectiveness of sludge accumulation is low.

The present invention solves the above-mentioned problems of the conventional technology, and consists of a plurality of baffle plates each having an inverted V-shaped cross section on the horizontal plane near the bottom of the processing tank, with appropriate gaps between them, and a longitudinal direction. Arranged parallel to the width direction or length direction of the treatment tank, the inside of the treatment tank is divided into a main tank section above the baffle plate and a sludge collection section below,
A sludge discharge means is attached to the bottom of the tank of the sludge recovery section, and its operation generates a liquid flow of the processing liquid from the main tank section to the sludge recovery section in the gap between the baffle plates. is inclined toward the sludge discharge means to form a concave tank bottom, and a processing liquid spouting means is attached to the concave tank bottom, and the processing liquid is spouted toward the sludge discharge means by its operation. The present invention relates to an immersion type phosphate chemical treatment apparatus characterized by the following.

The present invention will be described in detail below with reference to FIG. 4 of the accompanying drawings.

39 is a plurality of baffle plates arranged on the horizontal surface near the tank bottom 32 of the processing tank 1 over the entire area;
As a result, the inside of the treatment tank is divided into an upper main tank section 1a and a lower sludge recovery section 1b. The baffle plates 39 have an inverted V-shaped cross section, and are provided with an appropriate gap between them (for example, in the case of automobile body processing (the same applies hereinafter)).
10-150mm). As shown in the figure, the arrangement is such that the length direction of the baffle plate 39 is parallel to the width direction of the processing tank 1.
It may be parallel to the length direction of. Although there is no particular restriction on the angle of the inclined surface of the baffle plate 39, in order to smoothly introduce the sludge from the main tank section 1a to the sludge recovery section 1b, the angle of repose of the sludge (approximately
Advantageously, it is inclined at an angle equal to or greater than 60°). It may be inclined at an angle smaller than the angle of repose of the sludge (approximately 30 degrees), but if the slope is too gentle, sludge will accumulate on the inclined surface. The width of the inclined surface may be arbitrary (for example, about 100 mm).

As shown in the figure, the tank bottom 32 is inclined downward toward the sludge discharge port 33, so that the sludge introduced into the sludge recovery section 1b through the gap between the baffle plates 39 can be removed from the sludge discharge port by means described later. This is advantageous for smooth movement and accumulation toward 33. There is no particular restriction on the angle of inclination, but since the settling sludge is forcibly moved and accumulated by the means described below, the angle may be smaller than the angle of repose of the sludge. Therefore, the depth of the recess 32 formed by the slope of the bottom of the tank can be made shallower than that of the device shown in FIG. 1, which is advantageous in terms of device construction and installation. In addition,
Although there may be a plurality of recesses 32 as shown in the drawing, or there may be a single recess 32, the former case is advantageous in that a shallower recess can be constructed.

A pipe 5 with a pump 4 is provided at the sludge outlet 33.
is connected, and the suction force of this pump 4 generates a liquid flow at an appropriate flow rate (0.1 to 0.2 m/min) in the gap between the baffle plates 39. As a result, the sludge produced as a by-product in the main tank section 1a is actively introduced into the sludge recovery section 1b. The sludge-containing treatment liquid introduced into the filter 6 through the pipe 5 is filtered there, and the filtrate is introduced into the overflow tank 40 through the pipe 7. The pipe 5 has a branch pipe 37, which is connected to a spray riser 38 disposed at the bottom of the tank, as in the case of the apparatus shown in FIG. ing. (Of course, a configuration in which the liquid from the tube 7 is spouted may also be adopted). As a result, the sludge at the bottom of the tank is forcibly moved toward the sludge discharge port 33 and accumulated. At that time, in the gap between the baffle plates 39, the sludge collection part 1 is removed from the main tank part 1a.
Since there is a liquid flow to b, the sludge in the sludge recovery section 1b will not fly up to the main tank section 1a and be redispersed.

In this way, the main tank has a structure in which the sludge produced as a by-product in the main tank section 1a is efficiently introduced into the sludge recovery section 1b, and the sludge once introduced is not redispersed toward the main tank section 1a. The fact that the depths of the section 1a and the sludge collecting section 1b are adopted without increasing the depth is a basic structural feature and an advantage of the present invention. In addition, 41 is the object to be processed,
Reference numeral 42 indicates a conveyor that conveys this. Note that the baffle plate 39 does not necessarily have to have an inverted V-shaped cross section as described above, but may have an inverted triangular shape, for example, as long as the inclined surface meets the above-mentioned requirements.

[Brief explanation of the drawing]

1 to 3 are simplified diagrams each showing an example of a conventional device, and FIG. 4 is a simplified diagram showing an example of the present invention, in which 1 is a treatment tank, 1a is a main tank part, and 1b is a sludge tank. 32 is a tank bottom recess, 33 is a sludge discharge port, 4 is a pump, 5, 7, and 37 are pipes, 6 is a filter, 38 is a spray riser, and 39 is a baffle plate.

Claims (1)

[Claims for Utility Model Registration] 1. Inverted V cross section in the horizontal plane near the bottom of the treatment tank.
By arranging a plurality of letter-shaped baffle plates with appropriate gaps between them and with their lengths parallel to the width or length direction of the processing tank, the inside of the processing tank is separated from the main tank section above the baffle plates. It is divided into the lower sludge collection section,
A sludge discharge means is attached to the tank bottom of the sludge recovery section, and its operation generates a liquid flow of the processing liquid from the main tank section to the sludge recovery section in the gap between the baffle plates, and the sludge discharge means is attached to the tank bottom of the sludge recovery section. is inclined toward the sludge discharge means to form a concave tank bottom, and a processing liquid spouting means is attached to the concave tank bottom, and the processing liquid is spouted toward the sludge discharge means by its operation. An immersion type phosphate chemical treatment equipment featuring: 2. The apparatus according to item 1 above, wherein the baffle plate is arranged with its length direction parallel to the width direction of the processing tank. 3. The device according to item 1 above, wherein the concave tank bottom is inclined at an angle smaller than the angle of repose of the submerged sludge. 4. The device according to item 1 above, wherein the inclined piece of the baffle plate is inclined at an angle equal to or greater than the angle of repose of the submerged sludge. 5. The apparatus according to item 1 above, wherein a part of the processing liquid taken out of the tank by the processing liquid discharge means is supplied to the processing liquid spouting means.