JPS60110878A - Spray type treating device of chemical conversion coatings - Google Patents

Abstract

PURPOSE:To provide a rational spray type chemical conversion coating treatment device by constituting said device in such a way that washing when the material to be treated in a shower chamber stops is automatically accomplished and that chemical conversion treating liquid is not diluted by washing water. CONSTITUTION:Nozzles 6 for treating liquid and nozzles 22 fo pure water are disposed in a shower chamber 1 in which a material 4 to be treated is passed. A three-way valve 3 is provided in a drain port 31 provided in the bottom of the chamber 1. One side of said valve is connected to a liquid discharge pipe 33 communicating with a chemical conversion vessel 15 as a part for recovering chemical conversion treating liquid and the other is connected to a liquid discharge pipe 34 communicating with a drain channel 19 as a waste water part. The valve 3 is operated to be communicated with the vessel 15 in the stage of ejecting chemical conversion treating liquid 14 from the nozzles 6 to the material 4. The valve is communicated with the channel 19 in the stage of ejecting the pure water from the nozzles 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an apparatus for forming a chemical conversion film prior to painting, and particularly relates to a chemical conversion film treatment apparatus of the type that sprays a chemical conversion treatment liquid onto an object to be treated. It can be used in the production process of various mechanical parts such as.

BACKGROUND ART For example, when painting aluminum parts, it is well known that a chemical conversion film is formed by performing alkaline degreasing, water washing, and chemical conversion treatment prior to the painting process. Conventionally, the chemical conversion coating treatment method is
In addition to the dip method, in which the object to be treated is immersed in the chemical conversion treatment solution, there is also a spray method, in which the object is passed through a shower of chemical conversion treatment solution. In order to automate work and improve productivity, we have connected the processes of alkaline degreasing, water washing, chemical conversion treatment, water washing, and drying using a conveyor, and in order to obtain stable chemical conversion coating quality, we have set the conveyor speed at a constant speed. The processing time for each process is maintained within the specified time.

FIG. 1 is a cross-sectional view showing an example of a conventional spray-type chemical conversion coating treatment apparatus, in which a conveyor 2 consisting of a set of trolleys is installed above a shower room 1, and objects to be treated (hereinafter referred to as 4 (referred to as a workpiece) is allowed to pass through the shower room 1. A door 5 is provided on the side of the shower room 1, and a riser pipe 7 equipped with a large number of nozzles 6 is provided inside the shower room 1. 9 and a valve 10 to communicate with a discharge port of a shower pump 11. Furthermore, the bottom of the shower room 1 has a drain pan 1.
2, and a gutter 13 is attached to the drain plate 12 so as to hang down.

On the other hand, a chemical conversion tank 15 containing a chemical conversion treatment liquid 14 is arranged below the gutter 13, and inside the chemical conversion tank 15,
In order to keep the temperature of the chemical conversion treatment liquid 14 almost constant, a heating pipe 16 through which steam or hot water flows is arranged, and
A temperature sensor 17 is attached. Kasei I again! 15
The interior of the 1113 is divided into two parts by a filter 18, and a drain pulp 20 for draining the drain into the drainage groove 19 is attached to one of the compartments that allows excess liquid to drip from the 1113, and the other compartment is It communicates with the suction port of the shower pump 11 through a stop valve 21.

Therefore, in the above-mentioned apparatus, the chemical conversion treatment can be applied to the workpiece 4 by injecting the chemical conversion treatment liquid 14 from the nozzle 6 onto the workpiece 4 passing through the shower room 1 by the conveyor 2. Therefore, the conveyor 2 can be By rotating, chemical conversion treatment can be automatically and continuously applied to a large number of works 4. Further, the excess chemical conversion treatment liquid 14 can be collected into the chemical conversion treatment 115 via the gutter 13.

However, as mentioned above, in order to obtain a homogeneous chemical conversion film, it is necessary to maintain a predetermined period of time from the injection of the chemical conversion treatment liquid 14 to the washing with water, but the above-mentioned device cannot be used alone. Since it is usually incorporated into a series of production lines, it is necessary to stop or reduce the speed of conveyor 2 in order to synchronize with the previous and previous processes, and even at the end of work or during lunch breaks. In reality, it is difficult to maintain a constant chemical conversion treatment time. If the conveyor 2 is stopped for the reasons mentioned above, such as synchronizing with the previous and previous processes, the chemical conversion treatment liquid 14 may remain attached to the workpiece 4, and in such a case, the chemical conversion treatment production reaction may continue. Because it occurs, on the entire surface of the workpiece 4 or a part of it,
Excessive processing causes appearance defects such as uneven processing and cloudiness, resulting in defective products.

Therefore, conventionally, when stopping the conveyor 2, an evacuation operation is performed so that the workpiece 4 is removed from the shower room 1 and the washing is completed, and then the conveyor 2 is stopped.
When the work stops in the shower room 1, the door 5 is opened and the worker sprays water on the work 4 with a hose to wash the work 4. However, the former method can be used during periodic breaks such as the end of work or lunch break, but it can be used in the case of irregular breaks to synchronize the processes before and after, such as machining process or painting process. Since the conveyor 2 is often used for meat, and there are many irregular suspensions in actual work sites, when the conveyor 2 is suspended, the actual situation is that workers manually wash the conveyor 2 with water.

As described above, conventional devices have problems such as the difficulty of achieving complete automation and labor saving because manual intervention is required. Furthermore, in the conventional apparatus described above, when pure water for cleaning is poured onto the work 4 in the shower room 1, the water flows into the chemical conversion tank 15 through the gutter 13, and the chemical conversion treatment M, 1
Therefore, in order to prevent quality deterioration, the S degree of the chemical conversion treatment liquid 14 must be adjusted every time the conveyor 2 is stopped and washed with water.

Purpose of the Invention The present invention has been made in view of the above circumstances, and it is possible to automatically perform water washing when the object to be treated in the shower room stops, and furthermore, the chemical conversion treatment liquid is diluted by the washing water. It is an object of the present invention to provide a spray type chemical conversion coating treatment apparatus that can also prevent the above.

Structure of the Invention This invention provides a treatment liquid nozzle and a pure water nozzle that are disposed inside a shower room through which the material to be treated passes, and a chemical conversion treatment liquid recovery section and a wastewater outlet provided at the bottom of the shower room. When the chemical conversion treatment liquid is injected from the treatment liquid nozzle, the shower room is communicated with the chemical conversion treatment liquid recovery part through the valve mechanism, and the cleaning is performed from the pure water nozzle. A special feature of the present invention is that the shower room is configured to communicate with the waste water section by switching the valve mechanism when injecting purified water.

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIG. In the embodiment shown below, the same parts as in the conventional device shown in FIG. 1 are given the same reference numerals in FIG. 2 as those in FIG. 1, and their explanations will be omitted.

Inside the shower room 1 through which the workpiece 4 passes, in addition to a nozzle 6 that sprays the chemical conversion treatment liquid 14, a deionized water nozzle 22 that sprays purified water for cleaning toward the workpiece 4 is provided. A water nozzle 22 and a pure water riser pipe 23 are attached to the pure water riser pipe 23, and a pure water supply pipe 25 with a solenoid valve 24 inserted therein is connected to the pure water riser pipe 23. On the other hand, the piping 9 that communicates the discharge port of the shower pump 11 with the riser pipe 7 for the chemical conversion treatment W14 includes a three-way valve 26, a stop valve 27 and a The pressure gauge 28 indicates that the 4-heat treatment liquid 14
The three-way valve 26 is connected to a tatami-no-turn piping 30 that communicates with the chemical conversion tank 15 and has a stop valve 29 interposed therein. Therefore, by switching the three-way valve 26 from the state in which the chemical conversion liquid 14 is injected from the nozzle 6, the injection from the nozzle 6 is stopped and the chemical conversion liquid 14 is returned to the chemical conversion tank 15. I will do it.

Further, a drain port 31 for draining the liquid on the drain tray 12 is formed at the bottom of the shower room 1, and a three-way valve 3
2 is attached to the drain port 31. The three-way valve 32 constitutes a valve mechanism for selecting the location from which the liquid in the shower chamber 1 is to be drained, and is connected to the chemical conversion treatment liquid recovery section. The drainage pipe 33 that has passed through the chemical conversion fl 1517-3!lj is connected to one side (f), and the drainage pipe 34 that is connected to the drainage ditch 19 as the second open water section (1) is connected to the drainage pipe 34. .In addition, the above-mentioned 1) valve F tower is replaced with the three-way valve 32,
7C for each of the drain pipe 33 and drain pipe 34! A cutoff valve may be provided, and the location to be discharged may be selected by closing one of the cutoff valves and opening the other at the same time.

Next, we will discuss the operation of the device constructed as described below.

At the preparatory stage, almost before the production, the shower pump 11 is driven while the conveyor 2 is stopped.
3 for this! ! ! By switching the communicating three-way valve 26 to the return piping 30 side, the chemical conversion treatment 1! l! Circulate the liquid 14 1'7 Tr (-, at the same time steam the heating tube 16.
By controlling the temperature or flow rate of steam or dry water in response to the output signal of 7, the chemical conversion treatment liquid 14 is
temperature is maintained at a predetermined temperature.

When a start signal for starting the drilling process is issued from a central control panel (not shown), first, the three-way valve 26 communicating with the shower pump 11 is switched to the riser pipe 7 side, and the chemical conversion treatment liquid 14 is supplied to the nozzle. The sword is chanted from 6 to 1 in the shower sky.

Then, after a settling period 'A when the shower condition stabilizes,
The conveyor 2 is started, and as a result, the work 4 suspended by the hanger 3 passes through the shower, thereby continuously performing the chemical conversion coating treatment.

If the conveyor 2 stops for some reason during the above chemical conversion coating treatment, the work 4 is automatically washed with water as follows. The time chart of the cash is shown in Figure 3. First, when the conveyor 2 is stopped based on a stop signal output from a control device (not shown), the three-way valve 26 connected to the shower pump 11 is activated in the shower room after a predetermined time T1 has elapsed since the conveyor 2 has stopped. Chemical conversion tank 1 from side 1
As a result, the injection of the chemical conversion treatment liquid 14 to the workpiece 4 is stopped. Then, when a predetermined time fjlT2 (>TI) has elapsed since the conveyor 2 stopped, the three-way valve 32 attached to the drain port 31 of the shower room 1 switches from the chemical conversion tank 15 side to the drain groove 19 side. Therefore chemical conversion treatment? a1
4 until the three-way valve 32 is turned off after the injection stops (T2
-Tl'), the chemical conversion treatment liquid 14 remaining in the shower room 1 passes through the three-way valve 32 and the cell liquid 733 to the chemical conversion tank 15.
will be collected.

Also, drain port 31. At the same time as the switching of the three-way valve 32 that communicates with Water is sprayed q.1 from the nozzle 22 toward the workpiece 4, and the workpiece 4 is washed with water. The injection of pure water lasts for a preset predetermined time T311S, and the cleaning υ1 water that falls during that time flows out to the drain 19 via the water outlet 31, the three-way valve 32, and the drain pipe 34.

Then, pure water is injected for a predetermined period of time T 3 )A vcL/
When this is done, the solenoid valve 24 stops washing the workpiece 4, and after a predetermined period of time 4, which is set to drain the pure water in the shower room 1 to the drain 19, the three-way valve 32 is switched to Kasei If 15 ('ill). Then, before the conveyor 2 is restarted by eliminating the cause of the stoppage of the conveyor 2, the three-way valve 2G connected to the shower pump 11 is switched to the shower room 1 side. Stabilization time T5 during which the shower of the chemical conversion treatment liquid 14 is stabilized
After a while, the conveyor 2 starts running.

However, in the above device, if the conveyor 2 stops,
Pure water for cleaning is used in shower room 1 instead of chemical conversion treatment n1'.
Since it is injected toward the work 4 inside, it is possible to wash off the chemical conversion treatment T'J liquid 14 adhering to the work 4 and suppress an excessive chemical conversion film formation reaction. In addition, during such flushing, the three-way valve 32 can be operated to close the shower room 1.
Since the water is communicated with the J''F water groove 19, it is possible to prevent the pure water for cleaning from flooding into the chemical conversion treatment liquid 1, 1 and lowering its agility.

In addition, in the above embodiment, the chemical conversion treatment liquid recovery section is a chemical conversion tank, but the present invention is not limited to the above embodiment. The chemical conversion treatment liquid may be supplied from the liquid receiving tank to the chemical conversion tank through a filter. In addition, since cleaning wastewater needs to be discharged after being drained into some kind of drain to prevent pollution, the wastewater section to which the cleaning wastewater produced from the shower room 1 should be supplied is the drain 19 shown in the embodiment above. Not limited to
Of course, an appropriate wastewater treatment tank may be used.

Effects of the Invention ■As is clear from the explanation of soil, according to the apparatus of this invention, there is a
In addition to arranging a 4y nozzle and a pure water nozzle, a chemical conversion treatment liquid recovery part and a 1.
Valve PI3', which can be cut and communicated with the water part: M7
(-Mezu, chemical conversion treatment liquid is sprayed from the Todomari nozzle.)
tlζ・Kaito1jitowa, - Valve the chamber? 7 parts of the chemical conversion treatment l'H' + f times are communicated through the toga, and 1! of pure water for cleaning is supplied through the pure water nozzle. When βIJ 1 is removed, by cutting off valve C1, j,・\・``No R4rl 5n(
Since the structure is configured to allow the object to pass through, if the object to be treated stops inside the shower room, the object to be treated is automatically washed with water to wash away the chemical conversion treatment liquid without depending on handwriting, and the chemical conversion treatment solution is washed away. Since the chemical conversion treatment reaction can be prevented and the cleaning water can be discharged to the waste water section without being mixed with the chemical conversion treatment liquid, dilution of the chemical conversion treatment liquid can be prevented. Therefore, by using the apparatus of the present invention, it is possible to fully automate the chemical conversion treatment process and achieve labor saving, thereby achieving excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a conventional example, FIG. 2 is a schematic diagram showing an embodiment of the present invention, and FIG. 3 is a time chart of the washing operation when the conveyor is stopped. 1... Shower room, 2... Conveyor, 4...
Workpiece, 6... Nozzle, 14... Chemical conversion treatment liquid, 1
5...Chemical conversion tank, 19...Drain groove, 22...Pure water nozzle, 26.32...Three-way valve, 31...Drain port. Applicant: Toyota Motor Corporation wJ City Co., Ltd. Agent Patent Attorney Yutaka 1) Hisashi Take (1 idiot) Figure 1 2 Gooben 26 Niga #32 Den! 4?24 Figure 3

Claims (1)

[Claims] A treatment liquid nozzle that injects a chemical conversion treatment liquid toward the object to be treated and a pure water nozzle that injects purified water for cleaning toward the object are arranged inside a shower room through which the object to be treated passes, A drain port is formed in the shower room, and a valve 114fl is provided connected to the drain port to switch the shower room to communicate with either the chemical treatment liquid recovery section or the waste water section. When injecting a chemical conversion treatment liquid towards an object, the shower chamber is communicated with the chemical conversion liquid recovery section via the valve 1lIIR, and when pure water is injected towards an object to be treated, the shower chamber is connected to the valve mechanism. 1. A spray type chemical conversion coating treatment device, characterized in that it is configured to communicate with a wastewater section through a.