JPH0330425B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for treating workpieces that are continuously transferred by a conveyor device into a full-deep tank such as a cleaning liquid tank or an electrodeposition liquid tank in a cleaning process prior to painting or an electrodeposition coating process. This device relates to a floating prevention device for objects to be processed that is attached to the hanger frame of the conveyor device when completely immersing the object.A guide rail is attached to the conveyor rail without the need for manpower, and the hanger frame can be completely submerged. A simple mechanism in which a floating prevention rod that contacts the guide rail is attached so as to be able to move up and down, prevents the object to be processed from floating, thereby preventing the object from being damaged or falling off the hanger frame. The purpose is to

In the cleaning process prior to painting or the electrodeposition coating process, the workpiece placed on the hanger frame of a conveyor device is placed in a suspended state in a full-depth tank such as a cleaning liquid tank or an electrodeposition liquid tank. However, buoyancy occurs in the initial stage of entering the tank, causing a phenomenon in which the processed material separates from the hanger frame.

Due to this separation phenomenon, there is a risk that the workpiece may be damaged by the hanger frame or the workpiece may fall off the hanger frame.Furthermore, in the case of the electrocoating process, a large current passes through the hanger frame. Since the heat is supplied to the object to be processed, a spark phenomenon occurs when the object to be processed and the hanger frame are separated from each other, and the heat generated may damage the object to be processed or the hanger frame.

One possible solution to this problem is to increase the angle at which the material to be treated enters the full-deep tank, but this creates another problem: the tank becomes larger and the amount of liquid to be treated increases accordingly. However, if means for slowing down the rate at which the material to be treated enters the tank is adopted, a problem arises in that the amount of production decreases. It is also possible to improve water permeability by drilling vent holes in the object to be treated, but this may impair the functionality of the product. Furthermore, there is a method of connecting the hanger frame and the workpiece using a chain, wire, etc., but this method has the disadvantage that automation of the work is difficult and requires a lot of manpower.

The present invention makes it possible to prevent the above-mentioned separation phenomenon between the object to be processed and the hanger frame by having the structure described in the claims.

The configuration of the present invention will be described below with reference to the illustrated embodiments.

1, 2, and 3 show an example of implementation, and in FIG. 1, the conveyor rail 1
A hanger frame 3 is movably suspended by a trolley assembly 2, and a workpiece 6, which is an automobile body, is placed on hanger arms 4 and 5 of the hanger frame 3.

The above-mentioned conveyor rail 1 completely immerses the workpiece 6 placed on the hanger arms 4 and 5 into the electrodeposition liquid 8 of the full-deep tank 7 at the installation position of the full-deep tank 7 which is the electrodeposition liquid tank. It has curved paths 9 and 10.

As shown in FIG.
It is rotatably supported by a hanger frame 3, and is configured such that a workpiece 6 can be placed on a bracket portion 12 at the lower end. The code 13 in the figure is
This is a hanger hanging material that connects the trolley assembly 2 and the hanger frame 3, and is fixed to the hanger frame 3 via an electrical insulator 14.

The above-mentioned hanger frame 3 is shown in FIGS. 2 and 3.
As shown in the figure, two floating prevention rods 17 and 18 are fitted into bushes 15 and 16 so as to be slidable in the vertical direction.

The floating prevention rods 17, 18, the lower limit stopper 2 that comes into contact with the upper end surface of the above-mentioned bushes 15, 16
2, 23, and the lower limit stoppers 22, 2
Attachments 19 and 20 fixed to the lower ends of anti-floating rods 17 and 18 are placed above the workpiece 6 placed on hanger arms 4 and 5 at the position where surface 2
1, so that they can face each other with a small gap W between them. Also, floating prevention rods 17, 18
Abutment attachments 24 and 25 are fixed to the upper end to contact the lower surface of a guide rail, which will be described later.

The anti-floating rods 17 and 18 are arranged at locations on the upper surface 21 of the object 6 where scratches or dripping of the coating film are tolerated.

In the state shown in FIG.
Suppose that it rises to the position of the two-dot chain line 6',
Since there is no one in contact with the stopper attachments 24, 25, the anti-floating rods 17, 18 are pushed against the upper surface 21 of the workpiece 6, and the rods 17, 18 are pushed against the upper surface 21 of the workpiece 6, and the rods 17, 18 are pushed against the upper surface 21 of the workpiece 6, and the rods 17, 18 are pushed against the upper surface 21 of the workpiece 6, and the rods 17, 18 are pushed against the upper surface 21 of the workpiece 6, and It will rise to the position indicated by .

The position where the floating prevention rods 17, 18 can rise without restraint is the non-operating position of the rods 17, 18.

In FIG. 1, when the workpiece 6 placed on the hanger arms 4, 5 begins to enter the electrodeposition liquid 8 of the full-deep tank 7, the conveyor rail 1 has bending paths 9, 10. , a guide rail 26 is fixedly arranged over a predetermined section along the meandering paths 9 and 10.

As shown by the solid line in FIG. 2, this guide rail 26 allows the workpiece 6 to
The floating prevention rods 17 and 18 maintain the stationary state in which the attachments 19 and 20 face the upper surface 21 of the workpiece 6 with a small gap W between them. , when it is assumed that the hanger frame 3 moves along the curved paths 9 and 10, there is a slight gap H as shown in FIG. It is located at an upper position where the That is, the floating prevention rod 17,
The length of 18 is the attachment 19 at its lower end.
20 occupies a position facing the upper surface 21 of the workpiece 6 with a minute gap W, the rod 1
7, 18 upper end abutment attachment 24,
25 is of such a length that it faces the lower surface of the guide rail 26 with a slight gap H therebetween.

Therefore, as shown in FIG. 1, when the hanger frame 3 moves along the winding path 9 and the object 6 to be treated begins to be immersed in the electrodeposition liquid 8 of the full-deep tank 7, buoyancy is exerted on the front side. If the buoyant force is greater than the weight of the object 6, the object 6 begins to float, and the upper surface 21 of the object 6 is suspended by the anti-float rods 17, 1.
8, the rods 17, 18 rise, but the stopper attachments 24, 25 at their upper ends abut against the guide rail 26, preventing the rods 17, 18 from rising. , further lifting of the object 6 to be processed is prevented.

Two-dot chain lines 6', 19', 22', 24' in Figure 3
indicates the position of the object 6, etc. to be processed when lifting is prevented as described above.

The floating prevention rods 17 and 18 are connected to the guide rail 26
The position where the rods 17 and 18 come into contact with each other is the operating position of the rods 17 and 18.

The floating prevention rods 17 and 18 in the present invention are as follows:
It is selectively brought from the non-operating position to the use position by the guide rail 26 to prevent the workpiece 6 from floating up, and the floating prevention rods 17,1
Due to the action of 8, the workpiece 6, which is prevented from floating when entering the full-deep tank 7, is completely immersed in the electrodeposition liquid 8 in a stable state, and loses its buoyancy due to natural air removal. , In the portion of the bending path 10 where there is no guide rail 26, the transition is made in a stable fully submerged state.

The unloading of the object to be processed 6 from the hanger frame 3 having the above-described structure and the reverse placement thereof are performed in the following manner.

That is, as shown in FIG. 2, the hanger frame 3 is placed in the table lift 27 with the workpiece 6 placed on the hanger arm 4 of the hanger frame 3. Next, the fork 28 that has been waiting below is raised along the pole 29, and the workpiece 6 is raised to the position shown by the two-dot chain line 6' and separated from the hanger arm 4.
In reality, this operation also separates the hanger arm 5. At this time, the floating prevention rods 17 and 18 are in the non-operating position as described above, so the dotted line 1
It rises to the positions shown by 7' and 18' without restriction, and does not prevent the workpiece 6 from being lifted by the fork 28.

After the object to be processed 6 is separated from the hanger arm 4, the hanger arm 4 is expanded as indicated by reference numeral 4' using an appropriate device (not shown), and then the fork 28 is lowered to complete unloading. When mounting, it is sufficient to perform it in the reverse order.

The device for preventing floatation of objects to be processed according to the present invention has the configuration and operation described above, and includes a guide rail attached to the conveyor rail at least near the starting end of the bending path, parallel to the bending path, and a hanger. A float prevention rod is attached to the frame, and the float prevention rod is movable upward and downward from a position where its lower end faces the upper surface of the workpiece placed on the hanger arm with a small gap. , and its length is such that when the lower end occupies a position facing the upper surface of the workpiece, the upper end faces the lower surface of the guide rail with a slight gap. With a relatively simple mechanism, it is possible to automatically prevent the objects to be processed from floating during transportation, and the mechanism and action are relatively simple, making it easy to automate the work and moving the objects to be processed without the need for human labor. It can prevent objects from floating up,
This has the effect of completely preventing damage to the workpiece due to floating phenomenon when the workpiece enters the full-deep tank, or falling off from the hanger frame.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing the operation of the first embodiment, FIG. 2 is a schematic front view when the hanger frame shown in FIG. 1 is positioned inside the table lift, and FIG. FIG. 2 is a side view of only the main parts of what is shown in FIGS. 1 and 2. FIG. 1: Conveyor rail, 3: Hanger frame,
4, 5: Hanger arm, 6: Processed object, 7: Full-deep tank, 9, 10: Bend path, 17, 18:
Floating prevention rod, 21: Upper surface, 26: Guide rail, H: Slight gap, W: Slight gap.

Claims (1)

[Claims] 1. A hanger frame having a hanger arm on which the object to be processed is placed is suspended from a conveyor rail so that the object to be processed can be placed on the hanger arm. It has a meandering path that is completely immersed in the full-deep tank, and a guide rail is provided parallel to the meandering path at least near the starting end of the meandering path, and the hanger frame has a floating prevention mechanism. A rod is assembled, and the lower end of the floating prevention rod is movable upward from a position facing the upper surface of the workpiece placed on the hanger arm with a small gap. , and its length is such that when the lower end occupies a position facing the upper surface of the workpiece with a slight gap, the upper end faces the lower surface of the guide rail with a slight gap. A device for preventing floating of objects to be processed in full-deep processing equipment that has opposing lengths.