JPH0356273Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pretreatment device for pretreatment of metal coating, etc., and in particular, the present invention relates to a pretreatment device for pretreatment of metal coating, etc. The present invention relates to an improvement in a pretreatment device configured to spray or steam a heated pretreatment liquid.

[Prior art and its problems]

Pre-treatments such as metal painting are performed to impart corrosion resistance to the metal surface and improve paint adhesion.
This type of equipment supplies a pretreatment liquid such as a chemical solution or washing water heated to a predetermined temperature in a tank with an insulated wall into a pretreatment chamber throughout the entire process from degreasing to final washing. and inject it with a riser pipe etc.
A well-known spray-type pretreatment device sprays this onto the workpiece that is automatically transferred by a conveyor in the pretreatment chamber.In this spray type, the workpiece is immersed in a chemical tank and a cleaning water tank. Compared to dip-type pre-treatment equipment, which performs pre-treatment using water, the processing time can be significantly shortened, and there is no drop in chemical concentration and the finished appearance is good, making it suitable for pre-treatment of automobiles, electrical equipment, architectural hardware, etc. Widely used, especially suitable for mass production.

By the way, in the above-mentioned spray-type pretreatment equipment, the temperature condition of the pretreatment liquid sprayed onto the object to be treated from the riser pipe installed in the pretreatment chamber is usually 40 to 50°C. The pretreatment liquid stored in the tank is then heated to approximately 60°C, taking into account heat loss during delivery, and then sent to the pretreatment chamber. The injected pretreatment liquid is recovered into the tank through a recovery port formed at the bottom thereof and is recycled for circulation.

However, with such conventional equipment,
Since the pretreatment chamber and the tank are in direct communication through the recovery port, when the equipment is stopped during breaks or holidays, the vapor of the pretreatment liquid generated from inside the tank will flow through the recovery port. This has the disadvantage that it leaks into the pretreatment chamber and the temperature of the pretreatment liquid in the tank drops significantly.

In other words, if the temperature of the pretreatment liquid stored in the tank has decreased when work is resumed after the break period, the pretreatment liquid is heated using a heating coil installed in the tank. The temperature must be raised to 60°C, but if the temperature of the heating coil is raised rapidly, there is a risk that the pretreatment liquid in contact with the heating coil may change in composition and deteriorate in quality. The disadvantage is that the temperature must be heated gradually, and therefore it takes a very long time to raise the temperature, resulting in poor work efficiency.

In addition, in order to prevent this drawback, if the pretreatment liquid in the tank is heated continuously even during breaks, running costs will increase significantly, and at the same time, a large amount of steam will be generated in the pretreatment chamber without air supply or exhaust. It has the disadvantage that it fills up and adheres to conveyors, etc., promoting corrosion and brittleness.

[Purpose of invention]

Therefore, in this invention, when the operation of the equipment is stopped during breaks or holidays, the collection port leading from the pretreatment chamber to the tank is completely blocked, and the vapor of the pretreatment liquid generated in the tank is collected. It prevents leakage into the pretreatment chamber through the mouth and suppresses the drop in temperature of the pretreatment liquid stored in the tank, improving work efficiency and reducing running costs.
The purpose is also to prevent corrosion of the conveyor etc. installed in the pretreatment room.

[Structure of the idea]

In order to achieve this objective, the present invention is designed such that after a pretreatment liquid heated to a predetermined temperature in a tank is injected onto a workpiece being transferred within a pretreatment chamber,
In a pretreatment device configured to be collected into the tank disposed below through a recovery port formed at the bottom of the pretreatment chamber, between the recovery port and the tank, The present invention is characterized in that a drainage trap configured to store the pretreatment liquid discharged from the recovery port in a water seal and cause it to overflow into the tank from the water seal is provided.

[Effect of invention]

According to the present invention, while the device is in operation, the pretreatment liquid fed from the tank and injected into the pretreatment chamber flows down to the bottom of the pretreatment chamber and flows through the collection port into the drain trap. The water is sent to the water seal, overflows from the water seal, and is collected in the tank.

In addition, when the operation of the equipment is stopped and the pretreatment liquid is not injected into the pretreatment chamber, the collection port that communicates the pretreatment chamber and the tank is closed by the pretreatment liquid stored in the water seal of the drain trap. The tank is closed and the inside of the tank is sealed, and the vapor of the pretreatment liquid generated in the tank does not leak into the pretreatment chamber through the recovery port, so the drop in temperature of the pretreatment liquid stored in the tank is suppressed. be done.

〔Example〕

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a sectional view showing an example of a pretreatment apparatus according to the present invention.

In the figure, reference numeral 1 indicates a coating chemical conversion treatment chamber as a pre-treatment chamber, which is configured to perform coating chemical conversion treatment on continuously transferred objects 4 suspended on a conveyor 3 by a hanger 2. There is.

This coating chemical conversion treatment chamber 1 has a heat insulating material 5 applied to its outer surface, a plurality of riser pipes 6 that inject a chemical liquid serving as a pretreatment liquid, and are arranged facing each other at predetermined intervals inside, and a conveyor 3 is installed on the ceiling. A positive pressure cover 7 is disposed to surround it. Although not shown, air is introduced into the positive pressure cover 7 from an air supply fan via a positive pressure duct, so that the air pressure within the positive pressure cover 7 is increased.

Further, a tank 9 whose outer surface is covered with a heat insulating material 8 is provided below the film chemical conversion treatment chamber 1, and the chemical solution stored in the tank 9 is pumped by a pump 10 to the riser pipes 6, 6... is uniformly sprayed onto the object to be treated 4 at a predetermined angle from a large number of injection nozzles 11 attached to each riser pipe 6. It is discharged through the port 12, collected into the tank 9, heated again, and used for circulation.

Here, a drainage trap 13 is interposed between the recovery port 12 and the tank 9 to collect the chemical liquid discharged from the recovery port 12, seal it with water, and drain the overflow water into the tank 9.

This drain trap 13 includes a water seal part 15 integrally formed below the collection port 12 with a screen 14 fitted in the opening, and a chemical solution overflowing from the water seal part 15 that flows down to the water surface of the tank 9. It is composed of an inclined plate 16 that allows the

A drain plug 17 is provided at the bottom of the water seal part 15,
Further, the lower end portion of the inclined plate 16 extends below the water surface of the tank 9. The drain plug 17 is for removing dirt, sludge, etc. that have accumulated at the bottom of the water seal section 15 over time.

A heating coil 18 having a required heating capacity is disposed in the tank 9 to heat the stored chemical solution to about 60°C, and the temperature can be controlled by, for example, an electric resistance automatic thermostat. This is done by equipping with an indicator and activating a solenoid valve.

Note that 19 is a filter disposed on the opening side of the chemical liquid supply pipe 20 in which the pump 10 is interposed;
The filter 19 removes dirt, sludge, etc. contained in the chemical solution collected in the tank 9 to prevent clogging of the riser pipe 6 and the injection nozzle 11.

The above is an example of the configuration of the pretreatment device according to the present invention, and the operation thereof will be explained next.

First, during operation of the apparatus, the chemical solution stored in the tank 9 is heated to about 60° C. by the heating coil 18, and the chemical solution is passed through the chemical solution supply pipe 20 by the pump 10 to the riser disposed in the film conversion treatment chamber 1. It is fed to the pipes 6, 6..., and is atomized and injected from the injection nozzle 11 of each riser pipe 6, and due to heat loss during feeding or injection, it becomes about 40~50%
The chemical particles are sprayed onto the object to be treated 4 to undergo film conversion treatment.

At this time, at the same time that the chemical liquid particles injected from the injection nozzle 11 are splashed into the coating chemical conversion treatment chamber 1, the chemical liquid reacts with the object 4 to be treated, which is made of a steel plate, etc., and hydrogen gas etc. are generated from the surface thereof. However, the conveyor 3 is surrounded and protected by a positive pressure cover 7, and a required amount of air is introduced into the positive pressure cover 7 from an air supply fan via a positive pressure duct. As a result, the air pressure within the positive pressure cover 7 is increased, preventing splashed chemical particles, generated hydrogen gas, etc. from entering the positive pressure cover 7, and preventing corrosion and weakening of the conveyor 3.

The chemical solution sprayed onto the object to be treated 4 as described above flows down to the bottom 1a of the film conversion treatment chamber 1 and is discharged from the recovery port 12 formed in the bottom 1a. The water is collected in the water seal part 15 of the drain trap 13 integrally formed below, and at the same time, it overflows from the water seal part 15 and is collected in the tank 9 along the surface of the inclined plate 16.
It is reheated inside and used for circulation.

Note that the chemical solution overflowing from the water seal part 15 is dropped onto the water surface of the tank 9 without any impact through the inclined plate 19 extending below the water surface of the tank 9, so that no bubbles of the chemical solution are formed on the water surface of the tank 9. will not occur.

Next, during a break time, etc., the operation of the pump 10 that supplies the chemical solution in the tank 9 to the coating chemical conversion treatment chamber 1 is stopped, and the operation of the pump 10, which supplies the chemical solution in the tank 9 to the coating chemical conversion treatment chamber 1, is stopped, and the chemical solution is Also stop heating.

As a result, all the operations of the apparatus are stopped, the chemical solution no longer flows down to the bottom 1a of the film chemical conversion treatment chamber 1, and overflow from the water seal 15 of the drain trap 13 is also stopped. A collection port 12 that communicates the inside of the film conversion treatment chamber 1 and the inside of the tank 9 is maintained in a completely closed state by a certain amount of the chemical solution accumulated therein.

Therefore, the inside of the tank 9 whose outer surface is coated with a heat insulating material 8 is sealed, and the tank 9 is sealed as in the conventional case.
Since the vapor of the chemical solution generated in the tank 9 does not leak into the coating chemical conversion treatment chamber 1 through the recovery port 12, heat dissipation is significantly suppressed and a drop in the temperature of the chemical solution stored in the tank 9 is prevented. At the same time, the vapor of the chemical solution is prevented from entering the positive pressure cover 7 to which the air supply is stopped, causing corrosion and weakening of the gombel 3.

In addition, in FIG. 1, the film chemical conversion treatment chamber 1 and the tank 9 are arranged vertically and integrally, and the inside of the film chemical conversion treatment chamber 1 and the tank 9 are partitioned off by the bottom part 1a. However, in order to further suppress the drop in temperature of the chemical solution stored in the tank 9, a configuration as shown in FIG. 2 may be used.

That is, FIG. 2 is a sectional view showing another example of the pretreatment device according to the present invention, and parts common to those in FIG. Insulating materials 21 and 22 are applied to the outer surface of the bottom 1a of the chemical conversion chamber 1 and the upper surface of the tank 9, respectively, so that the two are separated from each other.

The interior of the film conversion chamber 1, whose entire surface is coated with a heat insulating material, and the tank 9 are communicated via a drain trap 13 whose entire circumferential surface is coated with a heat insulating material 23.

In this case, in particular, the entire upper surface of the tank 9 is covered with insulation material 22, except for the overflow port 24 into which the chemical solution overflowing from the water seal portion 15 of the drain trap 13 is dropped.
Since the tank 9 is covered with , heat dissipation from inside the tank 9 is significantly suppressed, and the degree of drop in liquid temperature is effectively reduced.

In the above-mentioned embodiments, the film chemical conversion treatment chamber was used as an example of the pretreatment chamber, but the present invention can of course be applied to a degreasing chamber, a hot water washing chamber, and the like.

[Effect of idea]

As described above, according to the present invention, when the operation of the device is stopped during breaks or holidays,
The collection port that communicates the inside of the tank that stores the pretreatment liquid with the pretreatment chamber is blocked by the pretreatment liquid that has accumulated in the water seal of the drain trap, so the inside of the tank is completely sealed. At the same time, the vapor of the pretreatment liquid generated in the tank is prevented from leaking into the pretreatment chamber through the recovery port, and therefore the drop in temperature of the pretreatment liquid stored in the tank is suppressed and running is prevented. This has the excellent effect of significantly reducing costs and improving work efficiency.

In addition, since the vapor of the pretreatment liquid is prevented from entering the pretreatment chamber when the equipment is stopped and the air supply and exhaust are also stopped, the pretreatment liquid is prevented from entering the pretreatment chamber. This also has the effect of preventing corrosion and brittleness due to adhesion of liquid, etc., and significantly improving the durability of the device.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing embodiments of the pretreatment apparatus according to the present invention, respectively. Explanation of symbols, 1... Film chemical conversion treatment chamber (pretreatment chamber), 1a... Bottom, 4... Treated object, 6... Riser pipe, 9... Tank, 10... Pump, 12
...Collection port, 13...Drainage trap, 15...Water seal section.

Claims (1)

[Scope of utility model registration request] The pre-treatment liquid heated to a predetermined temperature in the tank is
After being sprayed onto the workpiece being transferred within the pretreatment chamber, the liquid is collected into the tank disposed below through a recovery port formed at the bottom of the pretreatment chamber. In the pretreatment equipment,
A drainage trap is interposed between the recovery port and the tank, and is configured to collect the pretreatment liquid discharged from the recovery port in a water seal and cause it to overflow from the water seal into the tank. A pretreatment device characterized by: