JPH0454833Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a method for applying anti-rust oil, etc. to the surface of plate-shaped objects such as steel strips, aluminum plates, or copper plates that are continuously conveyed at a predetermined speed. The present invention relates to a position adjustment device for an electrostatic coating machine that can move an electrostatic coating machine that electrostatically coats a coating agent uniformly to an optimal position according to the width of a plate to be coated and other coating conditions.

[Conventional technology and its problems]

An electrostatic coating device that electrostatically applies a coating agent such as anti-rust oil to the surface of a plate-shaped object such as a strip-shaped steel plate is, for example, a DC
-A high voltage of about 80 to 120KV is applied and about
Multiple electrostatic coating machines each having a cup-shaped body that rotates at a high speed of about 20,000 to 50,000 rpm are installed in the coating chamber, and the cup-shaped body of each electrostatic coating machine is used as a cathode, and the cup-shaped body of each electrostatic coating machine is grounded and continuously coated. An electrostatic field is formed between the two electrodes using the plate-shaped object to be transported as an anode, and the coating agent particles charged and emitted from the tip of the cup-shaped body are electrically applied to the opposite electrode, the surface of the plate-shaped object. It is designed to form a uniform coating film by adsorbing it with a targeted suction force.

Here, the electrostatic coating machines installed in the coating chamber of the electrostatic coating device are arranged side by side in a diagonal line or in a staggered manner along the width direction of the plate-shaped object to be coated.
As shown in the figure, the spray pattern P of the coating agent formed by each electrostatic applicator 1a to 1f is mutually different from the spray pattern P of the adjacent electrostatic applicator when viewed from the transport direction (arrow F) of the object 2 to be coated. A portion of the coatings is overlapped appropriately to form a uniform coating film with a predetermined thickness on the surface of the object 2 to be coated.

By the way, when the object 2 to be coated is a strip-shaped steel plate, the width of the plate comes in various sizes, for example, from 1200 to 2400 mm. Therefore, the object 2 to be coated 2400 mm wide as shown by the solid line in FIG. 4 is electrostatically coated. 6 electrostatic coating machines 1a~
When electrostatically coating a 1,200 mm wide object 2' as shown by the chain line in the same figure using an electrostatic coating device with 1F arranged side by side in a staggered manner, the coating width becomes 1/2 and the operation time is reduced to 1/2. The electrostatic coating machines 1b, 1c and 1d (shown with chain lines)
Three machines are sufficient, and it should be possible to stop the others. However, in the conventional electrostatic coating equipment, each electrostatic coating machine 1a to 1f is fixedly arranged, so it is actually possible to stop the others. What is obtained is only the electrostatic coating machines 1a and 1f located at both the left and right ends, and there is a drawback that at least four electrostatic coating machines 1b to 1e must be operated. In this case, the electrostatic coating machines 1b and 1 located at both left and right ends of the object 2' are
Most of the coating agent emitted from e is not only oversprayed and wasted, which is very uneconomical, but also a large amount of the oversprayed coating agent goes around to the back side of the object to be coated 2'. There was also a drawback that the coating was coated, and a thick coating film was formed near the edges, resulting in uneven coating.

Furthermore, even if the plate width of the object 2 to be coated is always constant, if the amount of coating agent supplied to each electrostatic coating machine 1a to 1f or the rotation speed of the cup-shaped body changes, the size of the spray pattern diameter will change. The problem was that proper overlapping could not be maintained, resulting in uneven coating. In this case, even if the electrostatic coating machines 1a to 1f are not moved to properly adjust the overlapping spray patterns, the electrostatic coating machines 1a to 1f are housed in the coating chamber. However, there was a problem in that the adjustment work could not be carried out easily.

Therefore, the applicant has developed a system that allows each electrostatic applicator to be moved to the appropriate position even when the coating width changes due to a change in the plate width of the object to be coated, or when the diameter of the spray pattern changes. We proposed an electrostatic coating device that can prevent unnecessary spraying of coating material and uneven coating (Jitsuganaki).
59-161793).

In the application specification regarding this electrostatic coating device,
A position adjustment device is described in which each electrostatic applicator is engaged with a feed screw via an air clutch and moved in parallel, and this position adjustment device supplies compressed air to the air clutch and screws the female screw into the feed screw. A method of matching is adopted.

However, commercially available air clutches not only have a complicated structure and are difficult to install, but also have the trouble of having to be accurately centered in order to engage with the feed screw, and even the slightest misalignment can occur. During the practical application stage, it was discovered that there was a problem that the system did not operate smoothly.

Furthermore, since the air clutch itself is expensive, the equipment cost of the entire device also increases.

[Purpose of invention]

Therefore, the present invention has an extremely simple configuration, can be manufactured at low cost, and can be reliably engaged with the feed screw without requiring accurate centering like an air clutch, and can be applied to an electrostatic coating machine. An object of the present invention is to provide a position adjustment device for an electrostatic coating machine that can surely move the electrostatic coating machine to a proper position and prevent wasteful spraying of a coating agent and uneven coating.

[Structure of the idea]

In order to achieve this objective, the present invention uses a plurality of electrostatic coating machines arranged opposite to a plate-shaped workpiece that is continuously conveyed at a predetermined speed along the width direction of the workpiece. A position adjustment device for an electrostatic applicator for parallel movement, wherein a mounting base for fixing each electrostatic applicator is slidably supported by a guide rail installed parallel to the width direction of the object to be coated. At the same time, a cylinder or a solenoid having a telescopic rod is fixed to each of the mounting bases, and the tip of the telescopic rod is engaged with a valley of a male screw carved in a rotating shaft extending parallel to the guide rail. It is characterized by being designed to come together and separate.

[Effect of invention]

According to the present invention, a telescoping rod of a cylinder or solenoid fixed to a mounting base for fixing each electrostatic coating machine is extended, and the tip of the telescoping rod is connected to a male thread of a rotating shaft serving as a feed screw. The mounting base of each electrostatic coating machine and the rotary shaft are reliably engaged with each other by an extremely simple method of just advancing the machine.

At this time, even if there is some deviation in the mounting position of the cylinder or solenoid, the deviation can be sufficiently tolerated as long as the tip of the telescopic rod can engage with the valley of the male thread of the rotating shaft. Therefore, the reliability of the device is extremely high, and
Installation of the cylinder or solenoid is also extremely easy. In addition, since it uses a cylinder or solenoid with a simple structure that only has a telescopic rod,
Equipment costs are also very low.

〔Example〕

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

FIG. 1 is a plan view showing a position adjusting device for an electrostatic coating machine according to the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view thereof.

In the figure, reference numeral 3 denotes a coating chamber consisting of a chamber in which a carry-in port 4 and a carry-out port 5 are formed for carrying in and out a plate-shaped workpiece 2 such as a strip steel plate that is continuously transported in the direction of arrow F;
6 and 7 are objects 2 to be coated perpendicular to the conveyance direction F.
A guide rail installed parallel to the width direction of the
8a to 8e have guide rails 6 and 7 at both ends, respectively.
A mounting base 9 slidably supported by the guide rails 6 and 7 extends parallel to each mounting base 8a.
-8e is a rotating shaft configured to translate in parallel.

Electrostatic coating machines 1a to 1e are fixed to one end side of the mounting bases 8a to 8e, respectively, so as to face the plate-shaped object 2 at a predetermined distance, and these electrostatic coating machines 1a
-1e are arranged in a staggered manner as a whole.

Further, an air cylinder 10 is fixedly installed on each of the mounting bases 8a to 8e facing the rotary shaft 9, and a piston rod 11 of the air cylinder 10
At the tip of the rotary shaft 9, there is an engagement pin 12 that engages and disengages from the valley of a male thread 9a having a trapezoidal cross section.
is installed. This air cylinder 10
The piston rod 11 with the engagement pin 12 attached to the tip can move forward and backward in the direction of the rotating shaft 9 through the through holes 13 bored in each of the mounting bases 8a to 8e, and is mounted with the mounting screw 14. Platforms 8a-8e
is fixed.

The piston rod 11 is extended by compressed air supplied to the head side of the air cylinder 10, and is automatically contracted by the elastic force of the spring 15 when the supply of compressed air is stopped. is being done.

Further, the engagement pin 12 is formed into a substantially truncated conical shape with a tapered surface corresponding to the angle of the male thread 9a of the rotating shaft 9, and a threaded hole 16 bored at the tip of the piston rod 11. It is screwed together and fixed with a nut 17.

Then, the piston rod 11 of the air cylinder 10 is extended, the engagement pin 12 is advanced toward the rotating shaft 9, and the engagement pin 12 is engaged with the trough of the male thread 9a of the rotating shaft 9. By rotating the rotary shaft 9 in a desired direction, the engagement pin 12 is threaded to each mounting base 8a.
-8e are configured to be moved in parallel in the width direction of the object 2 to be coated.

Therefore, even if the center position of the engagement pin 12 attached to the tip of the piston rod 11 of the air cylinder 10 does not exactly match the axis of the rotating shaft 9, the tip of the engagement pin 12 can If the mounting bases 8a to 8e can be brought into contact with the male screw 9a of the rotary shaft 9 and engaged with the valley thereof, each of the mounting bases 8a to 8e can be engaged with the rotary shaft 9 and moved. Even if there is a slight deviation in the mounting position, there will be no problem.

In addition, 18 is an escape prevention plate that prevents the rotary shaft 9 from escaping when the engagement pin 12 engages with the male screw 9a of the rotary shaft 9, and 19 is a mounting base 8a to 8b that has been moved to an optimal predetermined position. The setscrews 20 are fixed to the guide rails 6 and 7, and 20 is an operating handle fixed to the end of the rotary shaft 9 that projects outside the coating chamber 3.

The above is an example of the configuration of the position adjustment device for an electrostatic coating machine according to the present invention, and the operation thereof will be explained next.

First, the plate-shaped object 2 to be coated is inserted through the loading port 4 of the coating chamber 3, pulled out from the loading port 5, and set on the conveyance line.
At the same time, a high voltage of about DC -80 to 120 KV is applied to the cup-shaped body 21, and the cup-shaped body 21 is rotated at about 20,000 to 50,000 rpm, and the object 2 to be coated is conveyed at a predetermined speed in the direction of arrow F. A required amount of coating agent such as rust preventive oil is supplied into the shaped body 21.

As a result, an electrostatic field is created between the two electrodes, with the cup-shaped body 21 as a cathode and the grounded object 2 to be coated as an anode, and the coating agent particles charged and emitted from the cup-shaped body 21 are at the opposite pole. A coating film is formed by being attracted to the surface of the object 2 by electric attraction.

Here, each of the electrostatic coating machines 1a to 1e has an object 2 to be coated.
Adjacent spray patterns P are arranged in advance so that they properly overlap each other when viewed from the transport direction F of the object 2, but in order to change the coating amount (coating film thickness), When the rotation speed of the shaped body 21 is changed, or when the type of coating agent is changed and its viscosity etc. are changed, the spray pattern P
As the diameter changes, proper overlapping is disrupted, resulting in uneven coating.

Now, for example, if the diameter of the spray pattern P becomes larger, it is necessary to adjust the positions of the electrostatic applicators 1a to 1e so as to increase the distance between them.

In this case, for example, in order to increase the distance between the electrostatic applicators 1a to 1e with respect to the electrostatic applicator 1c in the center, first supply compressed air to the air cylinders 10 of the mounting bases 8a and 8e, and then The piston rod 11 of the piston rod 11 is extended to engage each engagement pin 12 with the groove of the male thread 9a of the rotary shaft 9, and then the rotary shaft 9 is rotated with the operation handle 20 to connect the mounting base 8.
Electrostatic coating machines 1d and 1e fixed to a and 8e
to the right away from the electrostatic coating machine 1c.

In addition, at this time, the engagement pin 12 advanced in the direction of the rotating shaft 9 is connected to the external thread 9a of the rotating shaft 9.
Even if the engagement pin 12 contacts the top of the ridge and is not engaged with the valley of the male screw 9a, when the rotating shaft 9 is rotated using the operation handle 20 to move the thread of the male screw 9a, the engagement pin 12 It will be reliably engaged with the valley of the male screw 9a.

The object to be coated 2 is transported out through the exit 5.
While observing the surface of the electrostatic applicator 1d, move the mounting base 8d to which the electrostatic applicator 1d is fixed, correct the problem of overlapping of the spray patterns P between the electrostatic applicators 1c and 1d, and then install the applicator when it becomes appropriate. The piston rod 11 of the air cylinder 10 on the stand 8d is contracted to move the engagement pin 12 backward, and the engagement pin 12 is moved back.
The electrostatic coating machine 1d is separated from the rotary shaft 9.
is stopped at that position, and this time the degree of overlap between the spray pattern P of the electrostatic applicator 1e and the spray pattern P of the electrostatic applicator 1d is adjusted in the same way, and when it is appropriate, the air cylinder 10 of the mounting base 8e is adjusted. The piston rod 11 is contracted to separate the engaging pin 12 from the rotating shaft 9.

Next, the air cylinders 10 on the mounting bases 8a and 8b
The piston rod 11 is extended and the engagement pin 12
are engaged with the rotating shafts 9, respectively, and the handles 20
The positions of the electrostatic coating machines 1a and 1b are adjusted by sequentially moving them to the left so as to move them away from the electrostatic coating machine 1c while adjusting the malfunction in the same manner as described above.

In this way, other electrostatic coating machines 1a, 1b, 1c can be moved without moving the central electrostatic coating machine 1c.
By individually moving 1d and 1e and arranging them at appropriate positions, it is possible to prevent uneven coating.

Further, the plate width of the object 2 to be coated may be changed, for example, the first
When the plate width shown by the solid line in the figure becomes narrower as shown by the chain line, and when applying with four electrostatic coating machines 1a to 1d, the piston rods 11 of all the air cylinders 10 must be extended and the The matching pin 12 is engaged with the rotary shaft 9, and the entire electrostatic coating machine 1a to 1e is moved to the right while maintaining the spacing between them, and the electrostatic coating machine 1 at the right end is moved.
What is necessary is to stop the operation of e and perform electrostatic coating using the remaining four machines.

At this time, if necessary, the piston rod 11 of the air cylinder 10 is individually extended while observing the state of the coating film formed on the surface of the object 2, as described above, and the operation handle 20 is used to extend the piston rod 11 of the air cylinder 10. Of course, it is also possible to finely adjust the positions of the electrostatic coating machines 1a to 1d individually.

In the explanation of the above embodiment, the case where the rotary shaft 9 is manually operated by the operation handle 20 has been explained, but the present invention is not limited to this, and the rotary shaft 9 can be operated automatically using a motor etc. that can be rotated in forward and reverse directions. It may also be a case where it is driven.

Furthermore, the mechanism for moving the engagement pin 12 forward and backward is not limited to the piston rod 11 of the air cylinder 10, but may also be a piston rod of a hydraulic cylinder or a telescopic rod such as a solenoid.

[Effect of the invention]

As described above, according to the present invention, the telescopic rod of the cylinder or solenoid fixed to the mounting base for fixing each electrostatic coating machine is extended, and the tip of the telescopic rod is connected to the rotary shaft serving as the feed screw. The mounting base of each electrostatic applicator and the rotary shaft are securely engaged with each other by an extremely simple method of advancing the male thread of the cylinder or solenoid. Even if there is a misalignment, the misalignment can be tolerated to the extent that the tip of the telescoping rod can engage with the valley of the male screw of the rotating shaft, and the reliability of the device is extremely high. It has the excellent effect of being extremely easy to attach the cylinder or solenoid. Furthermore, each electrostatic coating machine can be moved using a simple cylinder or solenoid having a telescopic rod, resulting in a very low equipment cost.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of the position adjustment device of an electrostatic coating machine according to the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a cross-sectional view thereof, and Fig. 4 is a conventional electrostatic coating machine. FIG. 2 is a plan view schematically showing the arrangement of electrostatic coating machines in FIG. Explanation of symbols, 1a to 1e... Electrostatic coating machine, 2...
... Plate-shaped object to be coated, 3... Coating room, 4... Carrying entrance, 5
...Export exit, 6,7...Guide rail, 8a-8e
... Mounting base, 9 ... Rotating shaft, 10 ... Air cylinder, 11 ... Piston rod (telescopic rod), 12 ... Engagement pin, 20 ... Operation handle.

Claims (1)

[Scope of utility model registration request] An electrostatic coating machine position adjustment device that moves a plurality of electrostatic coating machines disposed opposite to a plate-shaped workpiece that is continuously conveyed at a predetermined speed along the width direction of the workpiece. A mounting base for fixing each electrostatic applicator is slidably supported by a guide rail installed in parallel along the width direction of the object to be coated,
A cylinder or a solenoid having a telescoping rod is fixed to each of the mounting bases, and the tip of the telescoping rod engages and disengages from a male screw groove carved in a rotating shaft extending parallel to the guide rail. A position adjustment device for an electrostatic coating machine, characterized in that it is configured as follows.