JPS62186430A - Method for adjusting spring characteristics of movable contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for adjusting the spring characteristics of a movable contact piece, such as a movable contact piece used in electromagnetic irons and electric appliances.

Summary of the Invention The present invention provides a movable contact piece having a movable contact at one end and the other end being bonded and fixed to a fixed terminal. In this method, the length of the free end of the movable contact piece is changed by selectively welding the welding positions along the longitudinal direction, and the spring constant thereof is changed.

BACKGROUND ART Conventionally, as a movable contact piece having a movable contact at one end and connected to a fixed terminal at the other end, there is a movable contact piece used in an electromagnetic relay, for example. First, in order to clarify the technical problem of the present invention, an example of an electromagnetic relay equipped with the movable contact piece will be described with reference to the accompanying drawings of FIGS. 6 to 8.

That is, the electromagnetic relay generally includes an electromagnet device 1, a movable block 1O, a contact mechanism 20, a base 30, and a case 40.

In the electromagnet device l, the bar-shaped iron core 5 is inserted into the center hole 3 of the spool 2 and connected to the rear end upright piece 7 of the yoke 6, so the magnetic pole faces 5a and 5b of the iron core 5 are shielded by shields rlIJ and temporary. An upright piece 6a protruding from the spool 2 at the tip of the yoke 6 is located opposite to the magnetic cover surface 5a. Further, a coil 9 is wound around the body of the spool 2.

The movable block 10 has a permanent magnet 1 attached to the frame I2 of the movable base 11.
9 is sandwiched between movable iron pieces 17 and 18 which are fixed. The movable iron pieces 17, 18 face the magnetic pole faces 5a, 5b, respectively, and the movable base 11 is movable in the directions of arrows k, k' with its arms 13.13 guided in the recesses 11.4 of the spool 2.

The contact mechanism 20 has 31 sets installed on both sides of the base 30, with a movable contact piece 21 having a movable contact 22 at one end.
and a fixed contact piece 23a having fixed contacts 24a and 24b,
23b, the other end of the movable contact piece 21.21 is fixed by caulking to the caulking part 26 of the fixed terminal 25, and the approximately central part thereof is attached to the arm part 13.21 of the movable base +1.
It is inserted into the groove 14.14 formed in 13.

In the above configuration, when the coil 9 is not energized, the movable base 11 returns in the direction of the arrow ', and the movable contact 22 closes the fixed contact 24a. When the coil 9 is energized, the movable base 11 moves in the direction of the arrow, the movable contact 22 switches to the fixed contact 24b, and when this excitation is released, the original state is restored.

The operating characteristics of this single stable type (self-resetting type) electromagnetic relay are shown in the graph of FIG.

Note that, as shown in FIG. 3, the movable contact piece 21 will be schematically illustrated and explained.

In FIG. 5, the vertical axis shows the applied load and suction force acting on the movable block 10, the horizontal axis shows the stroke of the movable block IO, and the base line α at the right end indicates that the movable block 10 is in the direction '' of the arrow in FIG. The base line β at the left end indicates the position when the movable block IO moves in the direction of the arrow in FIG. 3 and operates.

Furthermore, in FIG. 5, A represents the load characteristic of the adjustment surface of the movable contact piece 21, B represents the load characteristic of the movable contact piece 2I after R adjustment, and C represents the load characteristic when the coil 9 of the electromagnetic device I is not energized. D is the attractive force characteristic of the permanent magnet 19 in a certain case, D is the attractive force characteristic when the rated ampere turn, that is, the rated current is applied to the coil 9, E is the impressive ampere turn of the adjustment of the movable contact piece 21, That is, F indicates the attraction force characteristic at the operating voltage, and F indicates the open ampere turn before adjusting the movable contact piece 21, that is, the attraction force characteristic at the return voltage.

Note that A+, BI, At, and Bt indicate the times when the movable contact 22 contacts the fixed contacts 24a and 24b.

For example, if the return voltage at the operating position of the movable contact piece 21 is lower than the specified value, the fixed terminal 25 is twisted in the direction of the arrow y in FIG. A method has been used to adjust the operating characteristics by changing the load characteristics.

However, in the conventional adjustment method, as shown in FIG. 5, the load on the movable contact piece 21 becomes zero at a position farther from the operating position than the adjustment surface, and the spring constant of the movable contact piece 21 itself changes. Therefore, the load characteristic of the movable contact piece 21 is translated in three directions from the adjusted surface load characteristic A to the adjusted load characteristic B. Therefore, when the return voltage at the operating position increases, the operating voltage also increases,
It was not possible to change the difference between the operating voltage and the release voltage.

As a result, there is a problem in that when either the operating voltage or the return voltage is close to the specified value, adjustment cannot be made using the above-mentioned adjustment method.

In addition, G is the impressive ampere turn after adjusting the movable contact piece 2I, that is, the attraction force characteristic at the operating voltage, and I( is the open ampere turn after adjusting the movable contact piece 2!, that is, the return voltage) It shows the attraction force characteristics of.

Also, if the electromagnetic 8m device is a latching type, the attractive force characteristics of the permanent magnet I9 when the coil 9 is not energized will be point symmetrical, but since it is a latching type, the permanent magnet I9 at the set position and the reset position It is necessary that the suction force of the movable contact piece 21 always exceed the load applied to the movable contact piece 21.

However, in the case of the latching type, both the set voltage and the reset voltage are often too high or too low, and there is a problem that the load characteristics shift in parallel and cannot be adjusted using the adjustment method described above. Ta.

In order to solve the above-mentioned problem, the present invention is to selectively weld and adjust the welding position along the longitudinal force plane in the overlapping portion of the other end of the movable contact piece and the fixed terminal.

Therefore, according to the present invention, by changing the length of the free end of the movable contact piece, the spring constant of the movable contact piece changes, and the slope of the spring characteristic changes.

EMBODIMENT OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings shown in FIGS. 1 and 2.

As shown in FIG. 1, the movable contact piece used in this embodiment has a movable contact 22 at one end, and the other end of the movable contact piece 21 is crimped to the crimped part 26 of the fixed terminal 25 that is set upright. After fixing it. As for the adjustment method, the adjustment points 25a and 25b along the longitudinal direction are located in the overlapping part between the other end of the movable contact piece 21 and the fixed terminal 25.
, 25c, the movable contact piece 2
The length of the free end of 1 is changed, and its spring constant is changed. Examples of welding methods include contactless welding using a laser.

According to the adjustment method of this embodiment, the free end length of the movable contact piece 21 changes and its spring constant changes, so the slope of the load characteristic of the movable contact piece 21 changes in the graph shown in FIG. Then, the load characteristic A before adjustment changes to the load characteristic B after adjustment. Therefore, without moving both the operating voltage and the release voltage in parallel, the slope itself can be changed and adjusted, and the difference between the operating voltage and the release voltage can be changed, making it possible to set both to the desired specified value. I can do it.

That is, the higher the released ampere turn in the operating position, the higher the impressed ampere turn in the return position.

Moreover, according to the adjustment method of this embodiment, the movable contact piece 21
As the slope of the load characteristics changes, the characteristics of latching type electromagnetic relays change relatively between the set and reset positions, so latching type electromagnetic relays, which could not be adjusted in the past, can be adjusted. There is.

Note that the adjustment point does not necessarily need to be provided at the center of the movable contact piece, and the adjustment points may be provided at the upper and lower edges.

Effects of the Invention As is clear from the above explanation, according to the present invention, since the welding position is arbitrarily selected, the length of the free end of the movable contact piece is changed, and the spring constant of the movable contact piece is changed. As a result, the spring characteristics of the movable contact piece can be effectively adjusted.

Furthermore, the work of positioning the welding position is relatively easier and more accurate than the work of twisting conventional fixed terminals, so adjustment work can be done easily and accurately, and adjustment can be easily automated. It has the effect of becoming.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a side view showing the movable contact piece after adjustment, Fig. 2 is a graph showing the operating characteristics, Figs. 4 is a plan view after adjustment, FIG. 5 is a graph showing operating characteristics, FIG. 6 is a perspective view of an electromagnetic relay, and FIGS. 7 and 8 are electromagnetic relays. [A plan sectional view and a side sectional view of the vessel. 21... Movable contact piece, 22... Movable contact, 25
...Fixed terminals, 25a, 25b, 25c...
・Adjustment point (welding position), 26...Caulking part. Patent applicant: Tateishi Electric Co., Ltd. Representative: Patent attorney: Mr. Ao et al. and 2 others To Figure 1 and 2: 25a, 25b, 25c:'s 閤! Point (Kishi 4ri 4) 26: 1) Shime-kakudai 2 causes! @7 figure 118 figure

Claims (1)

[Claims] (1) In a movable contact piece having a movable contact at one end and fixedly connected to a fixed terminal at the other end, along the longitudinal direction of the overlapping portion between the other end of the movable contact piece and the fixed terminal. A method for adjusting spring characteristics of a movable contact piece, characterized by selectively welding at welding positions.