JPH06330389A - Immersion type coating pretreatment device - Google Patents

Abstract

(57) [Abstract] [Purpose] Efficiently removes foreign substances such as iron powder present in the object to be processed without significantly increasing equipment costs. [Structure] A piston rod of an air cylinder 14 is connected to a back surface of a striking plate 11. Air cylinder 14
Is expanded and contracted at a predetermined cycle by the air supplied through the electromagnetic valve 16. Along with this, the striking plate 11 reciprocates to strike the hanger 4, and as a result, the hanger 4 and the object to be processed held by the hanger vibrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in dipping type coating pretreatment equipment.

[0002]

2. Description of the Related Art As a pretreatment facility for electrodeposition coating, a hanger for holding an object to be treated, a treatment tank containing a treatment liquid, and a hanger for moving the object to be treated in the treatment tank. An immersion type coating pretreatment apparatus provided with a hanger moving means for immersing it in a treatment liquid has been put into practical use.

[0003]

Foreign matter (mainly iron powder) that has entered during the processing of the object to be processed is present in the bag-shaped part of the object to be processed and the seam of the iron plate, etc. Existing. This foreign matter is considerably removed by the floating action of the above-mentioned treatment liquid, the turbulent flow of the treatment liquid that occurs when the object to be treated enters and leaves the tank, and during movement within the tank, and the spray water washing applied to the object to be treated that has left the tank. However, the quality of the electrodeposition coating carried out after the pretreatment has heretofore been degraded due to insufficient removal thereof.

An ultrasonic oscillator is installed in the processing tank,
Attempts have been made to enhance the action of removing the above-mentioned foreign matter,
Providing a large-capacity ultrasonic oscillator that propagates high-level ultrasonic waves into the processing tank significantly increases the equipment cost.

In view of the above situation, an object of the present invention is to provide an immersion type coating pretreatment apparatus capable of efficiently removing foreign matter such as iron powder existing in an object to be treated without significantly increasing equipment costs. To do.

[0006]

According to the present invention, a hanger for holding an object to be processed, a processing tank containing a processing solution, and a hanger for moving the object to be a processing solution in the processing tank. An immersion-type coating pretreatment apparatus provided with a hanger moving means for immersing is provided with a vibrating means for vibrating the hanger.

[0007]

When the vibrating means is operated while the object to be processed is passing through the processing tank, the object to be processed vibrates together with the hanger in the processing liquid. As a result, foreign matter such as iron powder existing in the bag-shaped portion of the object to be processed and the seams of the members is forcibly released into the processing liquid.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the conveyor rail 1 is arranged such that the portions located above the processing tanks 2 and 3 follow the inner surface profile of each tank.

The hanger 4 holds a body 5 of an automobile, which is an object to be processed. The hanger 4 is, as shown in FIG. 2, via the roller 6 provided at the upper end thereof, the conveyor rail 1 described above. Is movably supported on the conveyor rail 1 by a pulling force of a pulling means (not shown).
While being guided by, move from the left to the right in FIG.

Along with the movement of the hanger 4, the body 5
Is subjected to the following pretreatment for painting. a. Preliminary degreasing is performed by the degreasing agent discharged from the spray nozzle 7. b. It is immersed in the degreasing agent contained in the processing tank 2. Then, the degreasing treatment is performed while passing through the degreasing agent. c. When it comes out of the processing tank 2, it is washed with the washing water discharged from the spray nozzle 8. d. It is dipped in the chemical conversion agent contained in the processing tank 3. Then, a chemical conversion film treatment is performed while passing through the chemical conversion agent. e. It is washed with the washing water discharged from the spray nozzle 9 when it comes out of the processing tank 5.

The body 5 which has been subjected to the above-mentioned pretreatment for coating is carried into an electrodeposition coating facility (not shown).

Above the processing tanks 2 and 3, along the conveyor rail 1, there are long striking plates 10 and 1.
1 are arranged respectively. The lengths and positions of the striking plates 10 and 11 are set so that the upper portion of the hanger 4 passes near the front surface of the body 5 at least while the body 5 is passing through the processing tanks 2 and 3.

As shown in FIG. 4, the striking plate 10,
The reference numeral 11 has guide rods 12 projecting from both ends of the back surface, and the guide rods 12 are slidably fitted to bearings 13 which are fixed bodies. A piston rod of an air cylinder 14 is connected to the center of the back surface of the striking plates 11 and 12. Therefore, each striking plate 10, 11
Can be moved in a direction perpendicular to the plane, that is, a direction indicated by an arrow in FIG.

The limit switches LS1 and LS2 shown in FIG. 1 are used to detect that the body 5 has entered the treatment tank 2 and moved to the exit position, and the limit switches LS3 and LS4 are Body-5
Are provided to detect that the tank has entered the processing tank 3 and has moved to the tank position.

The limit switches LS1 to LS4 are
As shown in FIG. 3, it is attached to the rear surface of the conveyor rail 1 and senses the detection rods 4a attached to the hangers 4 to turn on. The detection signals of these limit switches LS1 to LS4 are input to the control unit 15 shown in FIG.

Now, when it is detected by the limit switch LS1 that the body 5 is immersed in the processing tank 2, the electromagnetic valve 16 is turned on and off by the control unit 15 at a predetermined cycle. As a result, the air cylinder 14 periodically expands and contracts to reciprocate the striking plate 11, so that the plate 11 strikes the upper part of the hanger 4. The striking force of the plate 11 is generated by the repulsive force of the spring 14a provided in the cylinder 14.

The hit on the hanger 4 is continuously applied until the limit switch LS2 outputs a detection signal. Therefore, the body-5 held by the hanger 4
Is the processing tank 2 while vibrating by the vibrating force of the impact.
It will move in the bath liquid inside.

The control unit 15 includes, for example, flip-flops that are set and reset by the detection signals of the limit switches LS1 and LS2, and an oscillator that outputs a valve drive signal of a predetermined cycle under the set state of the flip-flops. Composed of.

By the way, foreign matter such as iron powder is usually present in the bag-shaped portion of the body 5 and the seam of the iron plate. The bath liquid acts to give a floating force to the foreign matter, and
The turbulent flow of the bath liquid that occurs when the body 5 enters and leaves the tank or when the body 5 passes through the tank 2 has a function of removing the foreign matter, but the bag-shaped portion, the joint, and the like. The foreign matter existing in the deep part of the surface may not be sufficiently removed by the above-mentioned action alone. However, according to the above embodiment, the body is
Since the foreign matter existing in the deep part is forcibly released into the bath liquid by the vibration acting on 5, the extremely high foreign matter removing action can be obtained.

In the other treatment tank 3, the striking plate 11 strikes the hanger 4, so that a vibrating force also acts on the body 5 passing through the treatment tank 3. Therefore, even if foreign matter remains in the bag-shaped portion or the like of the body 5 that has reached the tank 3, the remaining foreign matter is efficiently removed while the body 5 is moving in the tank 3, and As a result, in the next electrodeposition coating step, a clean body 5 from which the above-mentioned foreign matters have been removed is carried in.

In the above embodiment, the processing tank 2 containing the bath liquid composed of the degreasing agent and the processing tank 3 containing the film-forming agent are provided. ，
A treatment tank containing a surface conditioner is provided between the two. In this case, it is possible to provide a striking plate also in the processing tank containing the adjusting agent, and thus, the effect of removing the foreign matter can be further improved.

Further, in the above embodiment, the positions of the limit switches LS1 to LS4 are set so that the period during which the body 5 passes through the bath liquid is detected, but the body 5 starts the bath. The positions of the limit switches LS1 to LS4 may be set so that the period from the completion of the discharge to the completion of the bath can be detected. In that case, the striking plates 10 and 11 can be adapted to cope with the expansion of the period. Is set in the longitudinal direction.

Further, in the above embodiment, the air cylinder 14
Is used as the striking actuator, but the striking plates 10 and 11 may be reciprocated by utilizing the attraction action of the electromagnet. Also, as shown in FIG.
It is also possible to use the motor 17 as an actuator for striking. In this case, in order to convert the rotation of the motor 17 into a reciprocating motion, the plate 18 rotated by the motor 17, the eccentric position of the plate 18, and the striking plate 1
It is also used together with a rod 19 interposed between the back surfaces of 0 and 11.

[0024]

According to the present invention, the object to be processed is vibrated together with the hanger to forcibly remove foreign matter such as iron powder existing in the bag-shaped part of the object to be processed or the seam of members from the processing liquid. Therefore, the foreign matter can be efficiently removed without significantly increasing the equipment cost.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of a pretreatment for coating according to the present invention.

FIG. 2 is a conceptual diagram illustrating the configuration of a vibrating unit.

FIG. 3 is a conceptual diagram showing an arrangement of limit switches.

FIG. 4 is a perspective view illustrating the configuration of a vibrating unit.

FIG. 5 is a perspective view showing another example of the vibrating means.

[Explanation of symbols]

 1 Conveyor Rail 2, 3 Processing Tank 4 Hanger 5 Body 7, 8, 9 Spray Nozzle 10, 11 Impact Plate 14 Air Cylinder 15 Controller 16 Electromagnetic Valve 17 Motor LS1 to LS4 Limit Switch

Claims (1)

[Claims] 1. A hanger for holding an object to be processed, a processing tank containing a processing solution, and a hanger moving means for moving the hanger to immerse the object to be processed in the processing solution in the processing tank. In the immersion type coating pretreatment device, the immersion type coating pretreatment device is provided with a vibrating means for applying vibration to the hanger.