JPH023807Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray device that sprays a liquid by force feeding it to a riser pipe to which a plurality of injection nozzles are attached.

This type of device is used, for example, as a pretreatment device for metal coating, and is configured to spray pretreatment chemicals, cleaning water, etc. onto the object to be treated.

Pretreatment for metal painting, etc. is carried out to provide corrosion resistance to the metal surface and aid in paint adhesion. A so-called spray-type pre-treatment device is well known, in which a chemical solution and cleaning water are sprayed by a spray device, through which the object to be treated is automatically conveyed at a predetermined speed by a conveyor. It is widely used for pretreatment of electrical equipment, etc.

FIG. 1 is a side view showing an example of such a spray-type pretreatment device, in which a workpiece 3 suspended on a conveyor 2 via a hanger 1 is introduced into a film conversion treatment chamber A from the direction of arrow F. It is carried in, subjected to film conversion treatment here, and then transported to the next stage washing room B.

Inside the film conversion treatment chamber A and the washing chamber B,
A plurality of riser pipes 4, 4, . . ., and 5, 5, . As shown in the figure, they are arranged opposite to each other on both sides of the conveyor 2.

A chemical liquid tank 6 is provided at the bottom of the film conversion treatment chamber A, and the chemical liquid stored in the chemical liquid tank 6 is supplied to the riser pipes 4, 4 via a water supply pipe 8 by a pump 7.
..., and is sprayed onto the object 3 at a predetermined angle from a large number of injection nozzles 9, 9... installed at required intervals along the longitudinal direction of the riser pipe 4, and subjected to film conversion treatment. After that, the chemical liquid is collected into the chemical liquid tank 6 through the chemical liquid collection port 10, and is continuously used by circulating the chemical liquid.

Further, a washing water tank 11 is arranged at the lower part of the washing room B arranged after the coating chemical conversion treatment room A.
The cleaning water stored in the cleaning water tank 11 is supplied to the riser pipe 5 through the water supply pipe 13 by the pump 12.
5..., is sprayed at a predetermined angle from a large number of spray nozzles 9, 9... onto the object 3 to be treated, and is then collected into the washing water tank 11 through the washing water recovery port 14. The cleaning water is circulated and used continuously.

By the way, as mentioned above, the shapes and sizes of the objects 3 to be treated that are carried into the film conversion treatment chamber A and the washing chamber B are various. For example, as shown in FIG. In some cases, the length of the object to be treated 3 is extremely smaller than the total length of the riser pipes 4 and 5 that inject the chemical solution and cleaning water onto the object to be treated 3. In such a case, it is desirable to limit the injection of unnecessary chemical solution (or cleaning water) from the injection nozzle 9 of the riser pipe 4 or 5 as much as possible depending on the length of the object 3 to be treated.

That is, if the amount of chemical solution (or cleaning water) supplied to the riser pipe 4 or 5 is large, a load will be placed on the pump 7 or 12 in proportion to the amount, increasing the power cost, and the dirt contained in the chemical solution and cleaning water will be increased. , sludge, etc. tend to clog the injection nozzle 9 of the riser pipe 4 or 5, and the strainers 15 and 16 disposed in the chemical tank 10 and the wash water tank 11 have to be replaced more frequently.

Furthermore, the chemical liquid is generally heated to 50 to 70°C, and the greater the amount of the chemical liquid injected from the injection nozzle 9 of the riser pipe 4, the greater the amount of heat dissipation, and the faster the temperature of the chemical liquid decreases. There is a problem in that a large amount of heat is required to heat the chemical solution.

Therefore, when the object 3 to be processed is a small part, it is desirable to reduce the amount of chemical solution (or cleaning water) supplied to the riser pipe 4 or 5 accordingly.

However, the conventional spray device has a water supply pipe 8, which is equipped with a pump 7 or 12 as shown in FIG.
13, one end of each riser pipe 4, 4, 5, 5, .
9 had no choice but to spray the chemical solution (or cleaning water) from...

Therefore, in the present invention, in such a spray device, the portions to which the spray liquid such as chemical solution or cleaning water is supplied and the portions to which the spray liquid such as cleaning water is not supplied in the longitudinal direction of the riser pipe are arranged in accordance with the shape, size, etc. of the object to be sprayed. By making it possible to separate and form the injection liquid at appropriate times, unnecessary injection of the injection liquid is suppressed as much as possible, thereby reducing the power cost and heat loss of the pump that pumps the injection liquid, and reducing the running cost. The purpose is to prevent clogging of injection nozzles, etc. as much as possible, and to reduce the frequency of replacing filters, strainers, etc.

That is, the present invention provides a sprayer in which a plurality of riser pipes to which a plurality of injection nozzles are attached at required intervals along the longitudinal direction are arranged in parallel, and the spray liquid is fed under pressure to the riser pipes for spraying. The apparatus is characterized in that the riser pipe is configured to be able to divide the area to which the injection liquid is supplied and the area to which it is not supplied in the longitudinal direction of the riser pipe as appropriate.

Hereinafter, specific embodiments of the present invention will be described based on the drawings.

FIG. 3 is a perspective view of an example of the spray device according to the present invention, viewed from the rear side.

Each riser pipe 20, 20... is constructed by connecting three pipes a, b, and c each having a plurality of injection nozzles 21, 21... attached at required intervals,
A blind plate 23 is inserted into a flange joint 22 formed at the connecting portion of each pipe a, b, and c, so that the hollow portion of the riser pipe 20 is divided into three approximately equal parts.

The riser pipes 20 configured in this manner have their lower ends closed, their upper ends connected to the water supply pipes 24, and are vertically arranged in parallel at predetermined intervals along the longitudinal direction of the water supply pipes 24. .

The water supply pipe 24 is connected to a variable speed pump 26 that pumps the injection liquid stored in the water tank 25, and also has two water supply pipes extending perpendicularly to the pipes b and c on the back side of the riser pipe 20. Branch pipes 24' and 24'' are formed as branches.

Valves 27 and 28 are inserted into these water supply branch pipes 24' and 24'', respectively, and their distal ends are connected to pipes b and c of each riser pipe 20, 20, . . . , respectively.

If the object 3 to be processed suspended by the hanger 1 and conveyed by the conveyor 2 is a relatively large object as described above, the valves 27 and 28 are opened and the riser pipe is opened. Injection liquid is supplied to all of the 20 pipes a, b, and c, and the spray is injected from the entire area of the riser pipe 20.

Next, in the case of a medium-sized object such that the lower end of the object to be processed 3 suspended on the hanger 1 is at the pipe b position, the valve 28 is closed to cut off the water supply from the water supply branch pipe 24'' to the pipe c. Then, the spray liquid is supplied only to the pipes a and b of the riser pipe 20 and sprayed.

In addition, if the object to be treated 3 is an extremely small item, the valves 27 and 28 are both closed to cut off the water supply from the water supply branch pipes 24' and 24'' to the pipes b and c, and the water supply pipe 24 is The injection liquid is supplied only to the directly connected pipe a to cause spraying.

The size of the heat-treated object 3 can be detected using a phototube, an image sensor, or the like (not shown) placed along the transport route.

As described above, according to the present invention, the injection liquid is supplied only to the necessary areas of the riser pipe 20 in a timely manner according to the size of the article, and is not supplied to unnecessary areas. Therefore, the variable speed pump 26 using an inverter motor etc. can be operated at a low speed to reduce power costs, and at the same time, by reducing the amount of injection liquid supplied to the riser pipe 20, heat loss and injection nozzle 21 etc. can be reduced. This has the effect that clogging is prevented as much as possible, thermal efficiency is improved, and at the same time, the frequency of replacing the strainer 29, etc. in the water tank 25 is reduced.

Next, FIG. 4 is a front view showing another example of the spray device according to the present invention, and in this example, the tip side of the water supply pipe 24 and the water supply branch pipes 24' and 24'' are parallel to each other with a required interval. Pipes a, b and c whose bottoms are closed are interposed between the water supply pipe 24 and the water supply branch pipes 24' and 24'', respectively. That is, bottomed pipes a are connected to the water supply pipe 24 at required intervals, bottomed pipes b are similarly connected to the water supply branch pipe 24', and the water supply branch pipe 24 is also connected to the bottomed pipe b.
After the pipe c with a bottom is connected to the pipe 4'', the bottom of the pipe a is fixed to the water supply branch pipe 24', and the bottom of the pipe b is fixed to the water supply branch pipe 24', thereby constructing the spray device according to the present invention. has been done.

In this case as well, the same effects as in the embodiment shown in FIG. 3 can be obtained.

Note that each pipe a, which constitutes the riser pipe 20,
b and c do not necessarily need to be arranged in a straight line as shown in FIG. 4, but may be arranged in a manner that is inconsistent with each other.

Next, FIG. 5 is a front view showing still another example of the spray device according to the present invention, in which the riser pipe 20
The pipes a, b, b and c constituting the riser pipes 20 are connected via valves 30 and 31, respectively, and each riser pipe 20 has its lower end closed, and its upper end connected to the water supply pipe 24. The water supply pipes 24 are vertically arranged in parallel at predetermined intervals along the longitudinal direction.

When spraying a relatively large article, the valves 30 and 31 are opened to supply the spray liquid to the entire area of the riser pipe 20.
As products become smaller, valves 31 and 30
The injection liquid is then closed off, and a part to which the injection liquid is supplied and a part to which the injection liquid is not supplied are divided in stages.

As a result, in the case of small items that require a small amount of injection liquid, the variable speed pump that pumps the injection liquid can be operated at a low speed as described above, reducing power costs. Heat loss and clogging of the injection nozzle 21, strainer, etc. are also extremely reduced.

As described above, according to the present invention, areas to which spray liquids such as chemical solutions and cleaning water are supplied and areas to which they are not supplied are formed by dividing them at a timely manner according to the shape, size, etc. of the object to be sprayed. As a result, unnecessary injection of the injection liquid is suppressed, which reduces the power cost and heat loss of the pump that pumps the injection liquid, reducing running costs. It has the excellent effect of preventing clogging of nozzles, etc. as much as possible, and reducing the frequency of replacing strainers, etc.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an example of a pre-treatment device for painting using a conventional spray device, Fig. 2 is a partial side view of the conventional spray device, and Fig. 3 is a rear view showing an example of the spray device according to the present invention. Side perspective view, 4th
5 and 5 are front views showing other examples of the spray device according to the present invention, respectively. Explanation of symbols, 20...riser pipe, a, b, c
... Pipe, 21 ... Injection nozzle, 23 ... Blind plate, 24 ... Water supply pipe, 24', 24'' ... Water supply branch pipe, 26 ... Variable speed pump, 30, 31 ... Valve.

Claims (1)

[Scope of utility model registration request] Multiple riser pipes with multiple injection nozzles attached at required intervals along the longitudinal direction are installed in parallel,
In the spray device configured to force-feed the injection liquid to the riser pipe and spray it, it is possible to divide the area to which the injection liquid is supplied and the area to which it is not supplied in the longitudinal direction of the riser pipe at a timely manner. A spray device comprising: