JPS621790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dipping method used for dipping an object to be treated.

This invention can be applied to a variety of things, but for the sake of convenience, a description will be given of immersion of a small transformer in varnish. FIG. 1 shows a small transformer. 1 is a winding including an iron core, and 2 is a terminal protruding from the top of the transformer. As a conventional method for impregnating small transformers with varnish, the method shown in FIG. 2 can be considered. Since the terminal surface of a small transformer must not be immersed in varnish, highly accurate liquid level control is required. As shown in Figure 2, conveyor 3
The immersion tank 5 at the bottom of the basket 4, which is equipped with a small transformer that moves horizontally at a constant height, rises to the required height, and varnish is supplied from the liquid supply port 6. The structure is such that the small transformer is immersed while holding the In such a configuration, when the size and dimensions of the small transformers mounted in the baskets differ from basket to basket, the immersion depth position also differs, and the push-up height position of the varnish bath must be changed. The control becomes complicated, and it is difficult to improve the relative accuracy between the object to be processed and the varnish liquid level because of the position detection accuracy, the stopping accuracy of the varnish tank, the slack of the conveyor, and the dimensional accuracy of the basket. Furthermore, if the heavy tank is raised and lowered frequently, the liquid level will fluctuate, making it difficult to obtain high liquid level accuracy.

The present invention has been made with this point in mind, and an object of the present invention is to provide a highly accurate immersion method.

The present invention involves moving a hanger with a stopper on the arm, in which the object to be processed is mounted on a tray over an immersion tank in which the liquid level is kept constant due to overflow.
Relates to an immersion method in which the hanger is lowered and the stopper of the hanger is supported by one of the step-like blocks provided on the moving table above the immersion tank to adjust the immersion depth of the workpiece loaded on the tray of the hanger. .

The immersion method of the present invention includes, for example, an immersion tank in which the liquid level is kept constant by overflow, the workpiece is mounted on a tray, and can be moved onto a hanger with a stopper on the arm and a moving table above the immersion tank. The hanger is moved above the dipping tank and then lowered, and the stopper provided on the hanger is supported by one of the stepped blocks moved to the lower part of the stopper. This is carried out using an immersion device configured to adjust the immersion depth of the object to be processed mounted on the tray of the hanger.

In the dipping method according to the present invention, the stepped block has one or more steps, and by moving the moving table, a step of a predetermined height is placed at the bottom of the stopper provided on the arm of the hanger. part is located. Movement of the stepped block is accomplished by known means such as pneumatic cylinders, motor drives, and the like. Movement of the stepped block is initiated by receiving, for example, an electrical signal such that a step of a predetermined height is located below a stopper provided on the arm of the hanger. This stepwise block selection is performed using, for example, a combination of a detection plate and a photoelectric switch, a microswitch, or the like.

The tray and the hanger with arms are moved and lowered by known means.

According to the immersion method of the present invention, the immersion depth can be determined by the mechanical dimensional accuracy of the stopper on the arm of the hanger and the stepped block, so the limit switch etc. can be operated by raising the immersion tank as in the conventional method. Stopping accuracy can be greatly improved compared to a method that determines the stopping position by adjusting the stop position. When the type of workpiece changes, the immersion depth can be selected using a combination of step blocks and, for example, a photoelectric switch, and workpieces with different immersion depths can be continuously immersed. Examples of objects to be immersed to which the present invention is applied include small transformers, motor stators, and the like.

An embodiment of the present invention will be described below with reference to the drawings, taking as an example a case in which a small transformer is dipped in varnish.

As shown in FIG. 3, the small transformer 25 on the tray 8 fixed to the hanger 12 is mounted on the guide rail 9
It is loaded on a hanger 12 and is carried by a hanger 12 which is moved by a pawl 11 of a pitch feed bar 10. One tray 8 is loaded with small transformers of the same model. In order to select the impregnation depth so that the terminal 2 of the model is not immersed in the varnish, the impregnation depth detection plate 13 is attached to the position a, b, c, d or e on the tray 8. This embodiment will be explained by taking as an example a case where there are five types of impregnation depth (a case where the stepped block has stepped portions A, B, C, D, and E).

The hanger 12 is moved by the pawl 11 of the pitch feed bar 10 under the power of a pneumatic cylinder until it reaches a stop position 15 above the dipping bath 5 and stops.
When the detection plate 13 is installed in the different position a,
The detection plate 13 is connected to the photoelectric switch 14 at position a'.
(installed in position a', b', c', d' or e')
When the light is cut off, the step-like block 17 moves on the moving table 16 by the operation of a pneumatic air cylinder (not shown), and the stepped portion A comes directly under the stopper 19 and stops. Next, the hanger 12 is connected to the guide shaft 21 and the bearing 22 by the pneumatic cylinder 20.
is lowered, and the stopper 19 of the hanger
The small transformer stops after riding on the step A of the stepped block 17, and the small transformer is immersed in the varnish in the dipping tank 5 with the terminal 2 part exposed in the air. The varnish level is kept constant by an overflow 18. The overflowing varnish may be circulated through piping by a varnish circulation pump to the dipping tank again from the liquid supply port 6. When the soaking time has elapsed, for example, 5 minutes, the hanger is raised by the pneumatic cylinder 20, returned to the stop position 15, and then moved from above the soaking tank to the next step by the pawl 11 of the pitch feed bar 10. Above the dipping tank, the hanger to be dipped next moves to a fixed stop position and stops, and varnish dipping is performed in the same manner.
To explain the case where the detection plate is installed at position e, as shown in Fig. 4, the stopper 19 of the hanger 12 is stopped at the step E of the stepped block 17, and the small transformer on the tray is impregnated with a predetermined impregnation. Impregnated at depth. In addition, if trays loaded with objects of the same shape and size are transferred one after another, the detection plate installed on the first tray will continue impregnation at the same position, and this will only occur if the model changes. It is controlled so that the detection plate can be installed at other positions on the tray. When the hanger is at rest, the relationship between the arm of the hanger 12, the stopper 19, and the stepped block 17 is as shown in FIG. In the embodiment, an example was explained in which five types of impregnation depths were selected, but it goes without saying that the present invention is not limited to five types.

As described above, by attaching the impregnation depth detection plate according to the model of the small transformer and selecting the position of the stepped block, it is possible to automatically select an arbitrary impregnation depth and carry out continuous processing. Also,
It is preferable to finely adjust the height of the step-like block moving platform 16 by raising and lowering the adjustment screw 24 using the operation handle 23 as shown in FIG. 3, since this allows a wide variety of immersion depths to be selected. Although a small transformer has been described here, the present invention can also be applied to other objects to be treated.

According to the dipping method of the present invention, the impregnation depth can be changed easily and with high precision, so even if the size of the object to be immersed, such as a small transformer, changes, the varnish dipping position can be adjusted favorably. Therefore, it is extremely effective, as it eliminates the need for post-work to scrape off varnish adhering to the edges.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a small transformer to which the present invention is applied, Fig. 2 is a diagram showing a conventional varnish impregnation treatment method, Fig. 3 is a schematic diagram of an embodiment of the present invention, and Fig. 4 is a diagram showing a conventional varnish impregnation treatment method.
The figure is a schematic view of the vicinity of the stepped block, and FIG. 5 is a schematic view showing the hanger in its stopped state. Explanation of symbols: 1...Winding including iron core, 2...Terminal, 3...Conveyor, 4...Basket, 5...
Immersion tank, 6...liquid supply port, 7...liquid level, 8...tray, 9...guide rail, 10...pitch feed lever, 11...nail, 12...hanger, 13...
...Detection plate, 14...Photoelectric switch, 15...
...stop position, 16...movement table, 17...stepped block, 18...overflow, 19...stopper, 20...pneumatic cylinder, 21...guide shaft, 22...bearing, 23...operation handle ,2
4...Adjustment screw, 25...Small transformer.

Claims (1)

[Claims] 1. The workpiece is placed on a tray over the immersion tank where the liquid level is kept constant due to overflow, a hanger with a stopper on the arm is moved and lowered, and the stopper of the hanger is placed on the moving platform above the immersion tank. An immersion method characterized by adjusting the immersion depth of a workpiece mounted on a tray of a hanger by supporting it with one of the stepped blocks provided above.