JPS6210320B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energizing device for electrodeposition coating.
More specifically, the present invention relates to a device for electrically connecting a hanger and an object to be coated.

In the manufacturing of automobiles, etc., workpieces such as white bodies are held directly or indirectly on hangers guided by a conveyor, and are used in pre-painting processes, electrodeposition coating processes, intermediate coating processes, top coating processes, etc. After that, it is transported to the outfitting process.

In the electrodeposition coating process, the workpiece is generally held by a hanger and immersed in an electrodeposition bath, and the workpiece is coated by applying electricity. At this time, electricity is normally applied to the work by a hanger electricity supply method in which electricity is applied to the work from a power supply rail running along the conveyor via the hanger.

When a workpiece is directly gripped by a hanger, the wheel arch portion of the workpiece is usually used to grip the workpiece. However, since the wheel arch portion is a curved surface, if the tip of the hanger is fixed, poor alignment will occur between the workpiece and the tip of the hanger. If painting is performed in the electrodeposition coating process, intermediate coating process, and top coating process with such alignment defects occurring, an electrocoating film may be formed on the tip of the hanger.
In addition, paint mist is applied and an insulating layer is formed. If a hanger with an insulating layer formed on the tip is used repeatedly as it is, the current flow between the work and the hanger will be poor, resulting in poor coating and electrolytic corrosion pitting of the work during the electrodeposition coating process. In order to avoid these inconveniences, the insulating layer formed at the tip of the hanger must be removed each time the hanger is used, but such work is cumbersome.

Furthermore, when many types of workpieces having different shapes are processed on the same line, it is usually necessary to interpose a skid (or pallet) between the hanger and the workpieces. This skid is provided with a support for receiving the workpiece, and electricity is supplied through this support. Since it is impossible to adapt the shape of the skid support to the shape of all workpieces, poor alignment occurs between the support and the workpiece. In this case, as in the case of direct gripping, a failure in energization will occur, leading to various inconveniences.

In view of the above-mentioned points, the present invention provides an energizing device that does not cause energization failure between a workpiece and a hanger regardless of the shape of the workpiece.

That is, the present invention is an energizing device that energizes between a hanger and an object to be coated in electrodeposition coating using a hanger energizing method, and is composed of an upper leaf spring and a lower leaf spring, and both leaf springs are separated from each other in the center. are joined at both ends,
A lower leaf spring is attached to the tip of the hanger that grips the object to be painted, a conductive contact member that comes into contact with the object to be painted is fixed to the upper surface of the upper leaf spring, and the contact member and the hanger are connected to each other by a conductive member. (hereinafter referred to as the first invention); and an energizing device for energizing between a hanger and an object to be coated in electrodeposition coating using a hanger energizing method, the energizing device having an upper plate spring and a lower leaf spring, both leaf springs are joined at both ends with their center parts separated.
A lower leaf spring is attached to the skid on which the object to be painted is placed, a conductive contact member that comes into contact with the object to be painted is fixed to the upper surface of the upper leaf spring, and the contact member and the skid are connected by the conductive member. The present invention relates to an energizing device for electrodeposition coating (hereinafter referred to as the second invention).

Next, the present invention will be explained based on the drawings.

FIG. 1 is a front view showing an embodiment of the apparatus according to the first invention, FIG. 2 is a partial side view thereof, and FIG. 3 is an enlarged view of the main part thereof.

In FIGS. 1 to 3, 1 is a conveyor, and a hanging member 3 is attached to the conveyor 1 so as to be movable by means of rollers 2 and the like. A hanger 4 is pivotally attached to the hanging member 3. A power supply cable 5 runs along the conveyor 1, and the hanger 4 is energized from the power supply cable 5 via a current collector 6.

The hanger 4 has front and rear upper horizontal members 10 and 1.
1. It is composed of front and rear vertical members 12, 13 and lower horizontal members 14, 15. Upper horizontal member 1
0 and 11 are configured to be bent in the middle, so that the horizontal opening of the vertical members 12 and 13 can be adjusted. In addition, in Figure 1,
one of the front longitudinal members 12 and the rear longitudinal member 1
One of the three is not shown.

A support 16 for supporting the front of a work 7 such as an automobile body is rotatably attached to the tip of the front vertical member 12.

A support member 17 is rotatably attached to the tip of the rear vertical member 13, and energizing devices 30, 30 are attached to the support member 17.

The current supply device 30 consists of an upper leaf spring 31 and a lower leaf spring 32. The upper leaf spring 31 and the lower leaf spring 32 are connected to each other at both ends with their centers separated, and are configured to exhibit rebound resilience against loads from above. The lower leaf spring 32 is fixed onto the support member 17 with a fastening member 33 such as a bolt. A conductive contact member 34 is attached to the upper surface of the upper leaf spring 31 to attach a fastening member 3 such as an anchor bolt.
It is fixed at 5. The contact member 34 and the support member 17 are connected by a conductive member 36 such as a lead wire. The energizing devices 30, 30 are attached to the support member 17 so that the contact members 34 thereof are along the wheel arch portion of the workpiece 7. The contact member 34 is pressed against the wheel arch portion of the work 7 by the repulsive force of the leaf springs 31 and 32 when the work 7 is held by the hanger 4, and is brought into close contact with the work 7.
In this way, electricity can be properly passed between the hanger 4 and the workpiece 7 via the contact member 34, the conductive member 36, and the support member 17.

In the energizing device of the first invention, the contact member 34 is attached to the wheel arch portion of the workpiece 7 by the plate spring 3.
Since the structure is such that the contact member 34 is pressed into contact with the repulsive force of 1.32, the contact member 34 can be brought into close contact with the curved surface of the wheel arch, and the fixed support attached to the tip of a conventional hanger can be used. It is possible to completely prevent the occurrence of problems such as poor current flow due to poor alignment of the curved surface of the wheel arch and the support tool, resulting in poor coating, and electrolytic corrosion pitting in the energization method using tools, and it is possible to obtain coated products with good finishing quality. .
Furthermore, when the workpiece 7 enters the electrodeposition bath, buoyancy acts and the workpiece 7 floats up, making it easy to separate from the support. When this is the case, the ability to follow up the lifting of the workpiece 7 is good.

FIG. 4 is a side view showing an embodiment of the apparatus according to the second invention, FIG. 5 is a perspective view of the skid in FIG. 4, and FIG. 6 is an enlarged view of the main part of FIG.

In Figures 4 to 6, 20 is a conveyor;
A hanging member 22 is movably attached to the conveyor 20 by means of rollers 21 or the like. A hanger 23 is pivotally attached to the hanging member 22. A power supply cable 24 runs along the conveyor 20, and the hanger 23 is energized from the power supply cable 24 via a current collector 25.

A skid 26 is adapted to be engaged with the hanger 23. The skid 26 has a frame-like structure, and supports 28 and 29 for a workpiece 27 such as an automobile body are attached to the skid 26.
The workpiece 27 is placed on 8 and 29.

An energizing device 30' is mounted on the skid 26. The energizing device 30' is almost the same as the energizing device 30 in the first invention, except that the lower spring 32
is fixed to the skid 26, and the contact member 34
is different in that it is connected to the skid 26 by a conductive member 36.

The contact member 34 allows the workpiece 27 to be connected to the supports 28, 2
9 , it is pressed against the bottom of the workpiece 27 by the repulsive force of the plate springs 31 and 32, and is brought into close contact with the workpiece 27. Thus hanger 23
Electricity is supplied between the workpiece 27 and the workpiece 27 through the contact member 34, the conductive member 36, and the skid 26.

In the energizing device of the second invention, the contact member 34 is pressed into contact with the workpiece 27 by the repulsive force of the plate springs 31 and 32, so the contact member 34 can be pressed against the workpiece 27 of many types having different shapes. This completely eliminates the problems caused by poor alignment between the workpiece and the support, resulting in poor coating, and electrolytic corrosion pitting caused by the conventional energization method using supports installed on skids. It is possible to prevent this and obtain coated products with good finishing quality. In addition, the contact member 34 is attached to the workpiece 27 with the plate spring 3.
Since the parts 1 and 32 are pressed into contact with each other, the lifting of the workpiece 27 when entering the electrodeposition bath can be easily followed. Furthermore, since electricity is supplied between the hanger 23 and the workpiece 27 via the contact member 34,
The supports 28 and 29 need only have a support function, and are easy to design.

In the present invention, the contact member 34 is
In order to ensure a certain amount of contact area between the electrode 7 and the electrode 7, a flat plate is preferable, and is made of a metal with good conductivity, such as copper.

In addition, in the second invention, one end of the conductive member 36 may be directly connected to the hanger 23 without being connected to the skid 26, and in that case, electricity is passed between the hanger 23 and the workpiece 27 without passing through the skid 26. It can be done.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the energizing device of the present invention, Fig. 2 is a partial side view thereof, Fig. 3 is an enlarged view of the main part thereof, and Fig. 4 is another embodiment of the energizing device of the present invention. FIG. 5 is a side view showing an example, FIG. 5 is a perspective view of the skid in FIG. 4, and FIG. 6 is an enlarged view of the essential parts thereof. Main symbols in the drawing, 1, 20: conveyor, 4, 2
3: Hanger, 12, 13: Vertical member of hanger,
26: Skid, 7, 27: Object to be painted, 31, 3
2: leaf spring, 34: contact member, 36: conductive member.

Claims (1)

[Scope of Claims] 1. An energizing device that energizes between a hanger and an object to be coated in electrodeposition coating using a hanger energizing method, which consists of an upper leaf spring and a lower leaf spring, with both leaf springs having a center portion. The lower leaf spring is attached to the tip of the hanger that grips the object to be painted, and the conductive contact member that contacts the object to be painted is fixed to the upper surface of the upper leaf spring; An energizing device for electrodeposition coating, which connects the contact member and the hanger with a conductive member. 2. An energizing device that conducts electricity between the hanger and the object to be coated in electrodeposition coating using the hanger energizing method, and consists of an upper leaf spring and a lower leaf spring, and both leaf springs are connected at both ends with the center part separated. A lower leaf spring is attached to the skid on which the object to be painted is placed, a conductive contact member that comes into contact with the object to be painted is fixed to the upper surface of the upper leaf spring, and the contact member and the skid are connected by a conductive member. An energizing device for electrodeposition coating that is connected by