JPH0340396Y2 - - 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 during 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. The processing time can be significantly shortened compared to the dip-type pretreatment equipment, which performs pretreatment using the same method.In addition, there is no drop in chemical concentration and the finished appearance is good, making it ideal for pretreatment of automobiles, electrical equipment, and architectural hardware. 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,
When the equipment is stopped during breaks or holidays, the vapor of the pretreatment liquid stored in the tank with the insulated wall leaks into the pretreatment chamber through the collection port, causing the liquid of the pretreatment liquid in the tank to leak. The disadvantage is that the temperature drops significantly.

In other words, if the temperature of the pretreatment liquid stored in the tank has decreased when work is restarted after the break period, the pretreatment liquid is heated using a heating coil installed in the tank. The temperature must be raised to a predetermined temperature, but if the temperature of the heating coil is raised to a high temperature and heated rapidly, there is a risk that the pretreatment liquid in contact with the heating coil may change its composition, so the temperature should be raised gradually. The disadvantage is that it takes a very long time to heat up 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.

[Purpose of invention]

Therefore, the present invention automatically closes the collection port leading from the pretreatment chamber to the tank when the equipment is stopped during breaks or holidays, and the vapor of the pretreatment liquid stored in the tank is released. It prevents leakage into the pretreatment chamber through the recovery port, suppresses the drop in temperature of the pretreatment liquid in the tank, improves work efficiency and reduces running costs, and is installed in the pretreatment chamber. The purpose is to prevent corrosion of conveyors, etc.

[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 the pretreatment device configured to be collected into the tank through a recovery port formed at the bottom of the pretreatment chamber, a trap plate is disposed in the recovery port to close the opening, and the trap plate The present invention is characterized in that the plate is configured to automatically open and close depending on the weight of the pretreatment liquid that has flowed down to the bottom of the pretreatment chamber.

[Effect of invention]

According to the present invention, when 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 is disposed at the collection port. The trap plate is pushed open by its own weight and collected into 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 with a trap plate, and the inside of the tank is hermetically sealed. Since steam does not leak into the pretreatment chamber through the recovery port, a drop in temperature of the pretreatment liquid stored in the tank is significantly suppressed.

〔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 preprocessing device according to the present invention, and FIG. 2 is an enlarged sectional view showing an example of the configuration of the main parts thereof.

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 a workpiece 4 that is suspended from a conveyor 3 by a hanger 2 and is continuously transported. 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 to increase the air pressure within the cover 7.

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 collected into the tank 9 through the port 12, heated again, and recycled for use.

A heating flexible pipe 13 having a required heating capacity is disposed in the tank 9 to heat the stored chemical solution to approximately
It is heated to 60°C, and the temperature is controlled by, for example, equipping it with an electric resistance type automatic temperature indicator and operating a solenoid valve.

In addition, since dirt and sludge contained in the chemical solution sprayed onto the object to be treated 4 and collected are accumulated in the tank 9, the bottom surface thereof is sloped so that this can be easily removed. Riser pipe 6
A filter 15 is disposed on the opening side of the chemical liquid supply pipe 14 in order to prevent the injection nozzle 11 from clogging.

Next, a trap plate 16 that closes the opening of the recovery port 12 is disposed above the recovery port 12 that communicates the film conversion treatment chamber 1 and the tank 9.

As shown in FIG. 2, for example, one end of the trap plate 16 is supported by a hinge 17 so as to be vertically rotatable, and is biased to rotate upward by a balance weight 18, and the other end is treated with a coating. It is configured to be blocked by a stopper 19 which is fixedly installed and protrudes into the recovery port 12 from the bottom 1a of the chamber 1. The balance weight 18 is externally fitted onto a lever 20 connected to the trap plate 16 via a hinge 17, and its position can be adjusted using a set screw 21.

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 liquid stored in the tank 9 is heated to about 60°C by the heating coil 13, and the chemical liquid supply pipe 14 is passed through the chemical liquid supply pipe 14 by the pump 10 to the riser pipes 6, 6 in the film conversion treatment chamber 1. …
..., and the injection nozzle 11 of each riser pipe 6
is atomized and injected, and due to heat loss approximately 40 ~
The chemical liquid particles at 50° C. are sprayed onto the object 4 to undergo film conversion treatment.

At this time, at the same time that the chemical liquid particles sprayed 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 or the like, and hydrogen gas is generated from the surface thereof. However, the conveyor 3 is surrounded and protected by a positive pressure cover 7, and air is introduced into the positive pressure cover 7 from an air supply fan via a positive pressure duct, so the positive pressure is The air pressure within the 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 4 to be treated as described above flows down to the bottom 1a of the film conversion treatment chamber 1 and collects at the recovery port 12 formed in the bottom 1a.

Here, the trap plate 16 disposed at the opening of the recovery port 12 receives the weight of the chemical solution collected in the recovery port 12, and moves the hinge 17 against the balance weight 18 as shown by the chain line in FIG. Rotates downward as a fulcrum. As a result, the opening of the recovery port 12 is automatically opened, and the chemical solution injected in the coating chemical conversion treatment chamber 1 is recovered into the tank 9 through the recovery port 12 and heated again in the tank 9. used in circulation.

Next, during the break time, the operation of the pump 10 that feeds the chemical solution in the tank 9 into 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 supply of air to the positive pressure cover 7 and the chemical solution using the heating coil 13 are stopped. Also stop heating.

As a result, all operations of the apparatus are stopped, the chemical solution no longer flows down to the bottom 1a of the film conversion treatment chamber 1, and the trap plate 16 is rotated upward about the hinge 17 due to the weight of the balance weight 18. It is constantly energized so that its tip is the stopper 19.
As a result, the opening of the collection port 12 is completely blocked.

Therefore, the inside of the tank 9 provided with the heat insulating material 8 is sealed, and the vapor of the chemical solution does not leak into the film conversion treatment chamber 1 through the recovery port 12 as in the conventional case, so that heat dissipation is prevented. At the same time, the temperature drop of the chemical solution stored in the tank 9 is significantly suppressed, and at the same time, the vapor of the chemical solution enters into the positive pressure cover 7 where the air supply is stopped, causing corrosion of the conveyor 3. This can also be prevented.

In addition, in the above embodiment, the trap plate 16
Although the case has been described in which the opening and closing are performed using the balance weight 18, the invention is not limited thereto, and the opening and closing may be performed using a spring as shown in FIG. 3, for example.

That is, in FIG. 3, a spring butterfly valve is provided which closes the opening of the collection port 12 using a trap plate 16' and a spiral spring 30.

The spiral spring 30 has its central end fixed to a support rod 31 suspended horizontally within the recovery port 12, and its free end fixed to the back surface of the trap plate 16'.

Therefore, normally, the trap plate 16' is lifted upward as shown by the chain line by the elastic force of the spiral spring 30, and its four edges are formed to protrude into the recovery port 12 from the bottom 1a of the coating chemical conversion treatment chamber 1. Projection piece 32
The recovery port 12 is closed by being brought into contact with it from below.

When the chemical solution is injected in the film conversion treatment chamber 1, the injected chemical solution flows down to the bottom part 1a and collects on the trap plate 16', and the weight of the chemical solution causes the trap plate 16' to press against the spiral spring 30. It is automatically pushed down as shown by the solid line, and the collection port 12 is opened and the chemical solution is collected into the tank 9.

FIG. 4 shows an example in which the trap plate 16'' is opened and closed by swinging up and down due to the weight of the chemical solution, and is slid from the center of the frame 40 horizontally suspended on the bottom 1a across the collection port 12. A sliding rod 41 is provided vertically, and a trap plate 16'' loosely inserted through the sliding rod 41 is always urged upward by the elastic force of a coil spring 42. A projecting piece 43 that blocks the trap plate 16'' is provided at the upper end of the recovery port 12, and the inner circumferential surface of the recovery port 12, through which the trap plate 16'' can be moved up and down, is formed into a tapered surface 12a. The plate 16'' is designed to open and close smoothly.

In the above-mentioned embodiments, the pretreatment chamber is exemplified as a coating chemical conversion treatment 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 apparatus is stopped during breaks or holidays, and the injection of the pretreatment liquid is stopped in the pretreatment chamber, the pretreatment chamber and the pretreatment liquid are stored. Since the collection port communicating with the tank is automatically closed by a trap plate, the inside of the tank is completely sealed, and at the same time, the pretreatment liquid is released from the tank into the pretreatment chamber through the collection port. This is an excellent method in that it prevents steam from leaking and therefore suppresses the drop in temperature of the pretreatment liquid stored in the tank, significantly reducing running costs and improving work efficiency. effective.

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. Corrosion and brittleness due to adhesion of liquids are also prevented, and the durability of the device is also significantly improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a pretreatment apparatus according to the present invention, and FIGS. 2, 3, and 4 are enlarged cross-sectional views showing examples of the configuration of essential parts thereof. Explanation of symbols, 1... Film chemical conversion treatment chamber (pretreatment chamber), 1a... Bottom, 4... Treated object, 6... Riser pipe, 9... Tank, 10... Pump, 12
...Recovery port, 16, 16' and 16''...trap plate.

Claims (1)

[Scope of utility model registration request] The pre-treatment liquid heated to a predetermined temperature in the tank is
In the pretreatment device, the pretreatment device is configured to be collected into the tank through a recovery port formed at the bottom of the pretreatment chamber after being sprayed onto the workpiece being transferred within the pretreatment chamber. A trap plate is disposed at the recovery port to close the opening, and the trap plate is configured to automatically open and close depending on the weight of the pretreatment liquid that has flowed down to the bottom of the pretreatment chamber. Characteristic pre-processing equipment.