JPS6127971Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a phosphate chemical conversion treatment apparatus.

When painting a metal surface, chemical conversion treatment is generally a process that chemically creates a thin film of oxide or inorganic salt on the metal surface for the purpose of improving the adhesion of the paint or rust prevention before applying the paint. It is called.
Among these, for paints that require high quality, such as automobile exterior paint, a phosphate-based chemical conversion treatment that forms a zinc phosphate film or an iron phosphate film is usually performed. .

A conventional chemical conversion treatment apparatus for carrying out phosphate chemical treatment has a structure in which a degreasing device, a water washing device, a chemical conversion device, and a water washing device are successively arranged in the advancing direction of the object to be treated. The degreasing process and the chemical conversion process in this phosphate chemical conversion treatment apparatus require heating of the treatment liquid. The object to be processed after being processed in the degreasing device and the chemical conversion device and transported to the next water washing step is in a heated state and has the processing liquid attached to it. In conventional processing apparatuses, the heat taken out by the object to be processed is exchanged with the washing water of the washing process and then discharged outside the system, while the processing liquid is washed away by the washing water.

The processing liquid that adheres to the object to be treated and is taken out is a waste; on the contrary, the chemical reaction progresses due to the heat of the object to be treated, and the crystal structure of the chemical conversion film changes due to this chemical reaction. There was a risk that quality defects such as processing unevenness caused by this process would occur. Furthermore, the heat taken out by the object to be processed is completely wasted energy, which is not preferable from the viewpoint of energy saving.

This invention is intended to solve the above problem, and effectively utilizes the heat taken out of the processed material to reduce the amount of processing liquid taken out from the degreasing process and chemical conversion process, thereby preventing quality defects such as processing unevenness. The purpose of the present invention is to provide a phosphate chemical treatment equipment.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, phosphate chemical conversion treatment equipment 1
The apparatus has a structure in which a degreasing device 10, a water washing device 20, a chemical conversion device 30, and a water washing device 40 are successively arranged in the traveling direction of the processed material A (shown in the direction of arrow B in FIG. 1).

These devices 10, 20, 30 and 40 have spray chambers 11, 21, 31 and 41, respectively;
Main tanks 12, 22, 32, and 42 containing processing liquids used in the corresponding processing steps, main pumps 13, 23, 33, and 43 pumping up processing liquids,
Main spray pipes 14, 24, 34, and 44 that spray the pumped up treatment liquid toward the object to be treated A
It is composed of. The main tank 12 of the degreasing device 10 and the main tank 32 of the chemical conversion device 30 are provided with heating devices 15 and 35, respectively. Main spray piping 14, 24, 34 of each device
and 44 are arranged side by side in pairs on both sides of the transport track of the workpiece A in each of the spray chambers 11, 21, 31 and 41. In the figure, 2 is a conveyor that conveys the processed material A, and 26 and 46 are water supply pipes.

In the degreasing device 10 and the chemical conversion device 30, an auxiliary tank 50 communicates with the main tank 12 via a communication pipe 51 on the downstream side of each main tank 12, 32 in the conveying direction, and an auxiliary tank 70 communicates with the main tank 12 via a communication pipe 51. It is provided in communication with the main tank 32 via the main tank 32 . The processing liquid in the auxiliary tank (hereinafter referred to as
It is called auxiliary processing liquid. ) to the object A to be treated. The spray means 52, 72 are composed of auxiliary pumps 83, 73 that pump up the auxiliary processing liquid, and auxiliary spray pipes 54, 74 that spray the pumped auxiliary processing liquid toward the object A. . These auxiliary spray pipes, like the main spray pipes 14 and 34, are also arranged side by side in pairs on both sides of the transport path of the object A, as shown in FIG.

Outside air is supplied in a curtain shape to the upstream and downstream sides of each of the auxiliary spray pipes 54 and 74, and the sprayed auxiliary processing liquid (including that attached to the object to be treated A; the same applies hereinafter) comes into contact with the gas-liquid. Outside air supply/exhaust means 55, 75 for exhausting moisture to the outside of the system
is provided, followed by a pipe-shaped water supply means 56 for supplying water in a spray form toward the object A to be treated,
76 are provided. Outside air supply and exhaust means 55, 75
As shown in FIGS. 2 and 3, a pair of slit nozzles 57 and 77 supply the introduced outside air toward the transport path of the workpiece A, and the outside air is passed through filters 58 and 78 to the slit nozzle. 57,7
7, and exhaust fans 61, 81 that discharge the introduced outside air containing moisture through ducts 60, 80 extending from the ceiling. Note that as the make-up water from the water supply means 56, 76, washing water from the washing devices 20, 40 in the next step may be used.

Next, the operation of the phosphate chemical conversion treatment apparatus 1 will be explained.

The workpiece A suspended on the conveyor 2 is approximately
The degreasing liquid heated to 50° C. by the heating device 15 is degreased by passing through the spray pipe 14 when the pump 13 is operated. Next, when the auxiliary pump 53 is operated, the auxiliary degreasing liquid is sprayed from the auxiliary spray piping 54, and the object A passes through it, causing a gap between the heated object A and the sprayed auxiliary degreasing liquid. While heat exchange is carried out, the degreasing liquid taken out is diluted with the auxiliary degreasing liquid.

At the same time, by operating the intake fan 59, the filter 5
Heat is exchanged between the outside air supplied from the slit nozzle 57 via the slit nozzle 57 and the auxiliary degreasing liquid, including that attached to the workpiece A. is exhausted from the system. At this time, a large amount of moisture is evaporated due to heat exchange through gas-liquid contact between the outside air and the auxiliary degreasing liquid, and is removed by being included in the outside air, so that the liquid level in the main tank 12 and the auxiliary tank 50 decreases. Water supply means 56
The liquid level will drop further. Therefore, the water supply means 56 sprays and replenishes the object A with an amount of water commensurate with the drop in the liquid level.

Next, the workpiece A enters the water washing device 20, and the auxiliary degreasing liquid still attached to the workpiece A is removed by the main pump 23.
It is washed away by the flushing water sprayed by the operation of the machine. Note that a constant amount of water is always supplied to the main tank 22 from a water supply pipe 26. The treated object A is then transported into the chemical conversion apparatus 30.

In the chemical conversion process, the chemical liquid heated to approximately 50°C by the heating device 35 is sprayed from the main spray pipe 34 by the operation of the main pump 33 to the object to be treated A.
A chemical conversion treatment is performed by passing through, and a chemical conversion film of phosphate is deposited on the object A to be treated. Next, the auxiliary chemical liquid is sprayed from the auxiliary spray pipe 74 by the operation of the auxiliary pump 73.
By passing through, heat is exchanged between the heated object A and the auxiliary chemical liquid, and the chemical liquid taken out is diluted with the auxiliary chemical liquid.

At the same time, by operating the intake fan 89, the filter 7
Heat exchange is performed between the outside air supplied from the slit nozzle 77 via the slit nozzle 8 and the sprayed auxiliary chemical liquid, and the outside air removes heat from the auxiliary chemical liquid and is exhausted to the outside of the system from the exhaust fan 81. At this time, a large amount of water is evaporated due to heat exchange through gas-liquid contact between the outside air and the auxiliary chemical liquid, and is removed by being included in the outside air, so that the liquid level in the main tank 32 and the auxiliary tank 70 decreases.
Therefore, the water supply means 76 sprays and replenishes the object A in an amount corresponding to the drop in the liquid level.

Next, the object to be treated A enters the washing device 40, and the auxiliary chemical liquid still adhering to the object to be treated A is washed away by the washing water sprayed by the operation of the main pump 43. To the main tank 42,
A constant amount of water can be supplied from the water supply pipe 46 at all times.

With the above operations, the series of phosphating treatments is completed, and the next painting process and the object to be treated A are transported. In this embodiment, the system is operated under the following conditions, for example.

Weight of workpiece A: 500Kg/piece, Number of pieces processed per hour: 60 pieces/hour, Capacity of intake fans 59, 79 and exhaust fans 61, 81: 120m ³ /min, Temperature of auxiliary degreasing liquid and auxiliary chemical liquid :30℃, outside temperature:
25℃, outside air humidity: 50% relative humidity, water supply amount from water supply means: 100/hour.

Note that individual conditions also vary somewhat due to changes in the temperature and humidity conditions of the outside air.

FIG. 4 shows an immersion type degreasing device 90, which is different from the degreasing device 20 in the phosphate chemical conversion treatment apparatus 1 shown in FIG.

In this degreasing device 90, a conveyor 2' is disposed so as to move on a 〓-shaped trajectory that descends above the main tank 92, immerses the object A to be treated in the degreasing liquid, and then ascends. A main spray pipe 94 is arranged near the position where the substance A is discharged from the main tank 92. Also on the outlet side of this degreasing device 90,
The degreasing device 10 and the movable auxiliary tank 50 shown in FIG.
A spray means 52, an outside air supply/discharge means 55, and a water supply means 56 are provided. In FIG. 4, 91 is a spray chamber, 93 is a main pump, and 95 is a heating device. Similarly, the chemical conversion apparatus 30 shown in FIG. 1 can also be replaced with an immersion system.

In this device 90, the workpiece A suspended from the conveyor 2' is immersed in the degreasing liquid in the main tank 92 heated to about 50°C by the heating device 95, and then the main pump 93 is turned on when unloading the tank. During operation, degreasing liquid is sprayed from the main spray pipe 94 to perform degreasing. The subsequent processing is performed by spraying an auxiliary degreasing liquid in the same manner as in the degreasing apparatus 10 shown in FIG.

In the above embodiment, the main tanks 12, 92, and 32 of the degreasing equipment 10, 90 and the chemical conversion equipment 30 are connected to the auxiliary tanks 50, 70 by communication pipes 51, 71 in order to facilitate the control of their respective liquid levels. However, this method is not limited to this method, and there may be a method in which the auxiliary tank liquid is supplied separately and independently in response to a drop in the liquid level of the main tank, and water is supplied by a water supply means in response to a drop in the liquid level of the auxiliary tank, or It is also possible to connect the main tank and the auxiliary tank with an overflow gutter, and supply water through water supply piping in case of a drop in the liquid level in the main tank and the auxiliary tank.

According to the phosphate chemical conversion treatment apparatus according to the present invention having the configuration described above, the low temperature auxiliary treatment liquid in the auxiliary tank is immediately sprayed onto the object to be treated after degreasing and chemical conversion treatment to dilute the treatment liquid. By exchanging heat with the degreaser and chemical converter, and by introducing outside air and supplying water in the form of a spray, it is possible to reduce the amount of processing liquid carried out by the object to be treated from the degreasing device and the chemical conversion device, and to effectively utilize the heat carried out.

Furthermore, according to the present invention, by lowering the temperature of the treated object through heat exchange immediately after degreasing and chemical conversion treatment, the chemical reaction of the treatment liquid adhering to the surface is stopped, resulting in quality defects such as treatment unevenness. can be prevented,
By stopping the chemical reaction of this treatment liquid, the distance to the washing process can be made longer than in conventional phosphate chemical treatment equipment, which further reduces the amount of treatment liquid carried out. .

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a plan view showing a part of the degreasing device shown in Fig. 1;
The figure is a side view showing a slit nozzle portion constituting the outside air supply/discharge means, and FIG. 4 is a front view showing a degreasing device different from that in FIG. 1. In the figure, 1...Phosphate chemical conversion treatment equipment, 2...Conveyor, A...Product to be treated, 10...Degreasing device, 1
2...Main tank, 20...Water washing device, 30...Chemical conversion device, 32...Main tank, 40...Water washing device,
50, 70... Auxiliary tank, 52, 72... Spraying means, 55, 75... Outside air supply/discharge means, 56,
76...Water supply means.

Claims (1)

[Scope of utility model registration request] In a phosphate chemical conversion treatment equipment in which a degreasing device, a water washing device, a chemical conversion device, and a water washing device are sequentially arranged, an auxiliary tank is installed downstream of the main tank of each of the degreasing device and the chemical conversion device in the direction in which the material to be treated is transported. At the same time, a spray means is provided for spraying the treatment liquid in the auxiliary tank, which is lower temperature than the treatment liquid in the main tank, onto the object to be treated, and outside air is supplied to the upstream and downstream sides of the spray means, so that the sprayed treatment liquid and the air are A feature of the present invention is that an outside air supply/discharge means is provided to bring water into contact with the system and exhaust the water out of the system, and further, a water supply means is provided downstream of the outside air supply/exhaust means for supplying water in a spray form toward the object to be treated. Phosphate chemical conversion treatment equipment.