JPH0636662A - Adjusting device for electromagnetic relay - Google Patents

Abstract

PURPOSE:To make it possible to measure and adjust errors in manufacture at high accuracy and efficiency by constituting an adjusting device of a moving device for forcibly displacing a movable member, a force detector for detecting forces acting on the moving device, and a displacement detection device. CONSTITUTION:An electromagnetic relay adjusting device comprises a measuring element 2 for engagement with the movable contact of an electromagnetic relay 1, i.e., a subjected to be measured, a load cell 3 for detecting forces acting on the measuring element 2, and a pulse motor, etc., for displacing the load cell 3. The relay 1 has a pair of fixed members and a movable member 9 forming a cantilever, the pair of fixed members comprising a fixed contact 11 and a stopper 12. A correcting device comprises a fixed contact bending unit 17 for varying the position of the fixed contact 11, a stopper bending unit 18 for varying the position of the stopper 12, and a movable member bending unit 19 for varying the angle of installation of the movable member 9. Each portion is adjusted through required displacement while the amount of adjustment is accurately measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically measuring and adjusting each contact position of an electromagnetic relay and the operating force of a movable contact.

[0002]

2. Description of the Related Art In order to interrupt a relatively large current with a relatively small control current, or to automatically control the cooperation between a plurality of sets of operations, a pair of fixed contacts are provided between the pair of fixed contacts. The spring means normally elastically urges one of the fixed contacts in such a direction that it abuts, and when energized, it is displaced integrally with the armature attracted to the exciting coil and abuts the other fixed contact. Electromagnetic relays having different movable contacts are often used. In such an electromagnetic relay, the stability of the intermittent operation between the movable contact and both fixed contacts is an important requirement for obtaining the reliability of the entire control circuit. It is preferable that there is no manufacturing variation in the position accuracy and the operating force of the movable contact.

[0003]

However, the measurement and adjustment work of the operating force of the movable contact and the air gap between the contacts at the time of excitation and demagnetization in such an electromagnetic relay have to rely on conventional human labor. It was not possible to exclude the intervention of individual error. Therefore, quality control tends to be complicated, and there is a limit in improving productivity.

The present invention has been made to improve such disadvantages of the prior art, and its main purpose is to measure the manufacturing error with high accuracy and high efficiency and to make adjustment. It is an object of the invention to provide a regulating device for an electromagnetic relay which is constructed in such a way that it is possible.

[0005]

According to the present invention, such an object is to displace integrally with a pair of fixing members and an armature member which is located between the pair of fixing members and is attracted to the exciting coil. A structure of an adjusting device for an electromagnetic relay having a movable member that can elastically abut against one fixed member and that is constantly urged toward the other fixed member by an elastic force is A moving device for forcibly displacing the movable member against a force, a force detecting device for detecting a force acting on the moving device, and a displacement detecting device for detecting a displacement amount of the moving device. It is achieved by having.

[0006]

In this way, the operating force of the movable member can be obtained by detecting the spring reaction force of the movable member acting on the moving device while forcibly moving the movable member by the moving device. At the same time, the amount of movement of the movable member can be detected from the change in the force acting on the moving device, and thus the positional relationship between the respective members can be known.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows the construction of an electromagnetic relay adjusting device according to the present invention. This adjusting device includes a tracing stylus 2 that engages with a movable contact of an electromagnetic relay 1 that is an object to be measured.
A load cell 3 for detecting a force acting on the probe 2, a pulse motor 4 as a driving device for giving a displacement to the load cell 3, and a rotary for detecting a rotation angle of the pulse motor 4. An encoder 5, an air cylinder 7 for moving the base 6 to which the above-mentioned devices are attached to and away from the electromagnetic relay 1, a fixing jig 8 for fixing the electromagnetic relay 1, and FIG. In this case, it comprises a correction device (not shown).

The tracing stylus 2 is composed of an arm whose middle portion is pivotally supported on the base 6 with an appropriate lever ratio, one end of which is connected to the free end of the load cell 3 and, as shown in FIG. At the other end, a grip portion 10 that can loosely grip the free end portion of the movable member 9 of the electromagnetic relay 1 is formed.

The load cell 3 is composed of a resistance wire strain gauge or the like and is capable of equally detecting forces in both directions of expansion and contraction. It is provided with guide means so as to be linearly movable in the vertical direction in FIG. It is mounted on a base and is linearly driven by the pulse motor 4 through a known propulsion device such as a ball / screw device that converts rotational force. Since the load cell 3 and the tracing stylus 2 are connected to each other in a fixed relation, the tracing amount of the tracing stylus 2 is determined by knowing the moving amount of the load cell 3 from the rotation angle of the pulse motor 4 detected by the rotary encoder 5. The amount of displacement of the grip portion 10 can be calculated.

The electromagnetic relay 1 which is an object to be measured is shown in FIG.
2, a pair of fixed members including a fixed contact 11 and a stopper 12, a movable contact 13 at one end, and a movable member 9 at the other end fixed to a member common to the stopper 12 to form a cantilever. have. Movable member 9
Is made of a phosphor bronze material or the like, is normally elastically urged so that the movable contact 13 comes into contact with the stopper 12, and is integrally provided with an armature 14 made of a magnetic material.
When the exciting coil 15 is energized, the armature 14 is attracted to the yoke 16 of the coil, whereby the movable contact 13 contacts the fixed contact 11.

In the electromagnetic relay 1 having such a structure, the contact pressure (contact pressure P1) of the movable contact 13 against the fixed contact 11 during excitation and the contact of the movable contact 13 against the stopper 12 during demagnetization. The three points of pressure (stopper pressure P2) and stroke of the movable contact 13 (movable contact gap G) must be within the predetermined accuracy range.

When the measured values of the above items are out of the standard,
Adjustment is performed using a straightening device, and this straightening device will be described next. As shown in FIG. 3, the straightener corrects the fixed contact bending unit 17 for changing the position of the fixed contact 11, the stopper bending unit 18 for changing the position of the stopper 12, and the mounting angle of the movable member 9. It is composed of a movable member bending unit 19 for changing and is driven by a servo motor (not shown). The displacement amount, that is, the adjustment amount can be precisely measured and a required displacement can be given to each part. You can do it.

The contact pressure P1 is determined by the amount of bending of the movable member 9, as shown in FIG. Here the movable member 9
Is in the form of a cantilever whose fixed end is the connecting portion C with the armature 14 when the armature 14 is adsorbed to the yoke 16. Therefore, by changing the position of the fixed contact 11 in the fixed contact bending unit 17 (arrow A1 in FIG. 4), the amount of bending of the movable member 9 changes and the contact pressure P1 also changes.

Next, as shown in FIG. 5, the stopper pressure P2 changes according to the mounting angle of the movable member 9. Therefore, the base end portion 21 of the movable member 9 is sandwiched by the chuck 20 of the movable member bending unit 19 and the movable member bending unit 19 is further tilted (arrow A2 in FIG. 5) to the base end portion 21 of the movable member 9. The stopper pressure P2 can be adjusted by changing the mounting angle.

Further, the contact gap G is determined according to the movable range of the movable contact 13, as shown in FIG. Therefore,
The contact gap G can be set by first positioning the movable member 9 and the fixed contact 11 and then changing the position of the stopper 12 by the stopper bending unit 18 (arrow A3 in FIG. 6).

Next, FIG. 7 shows the procedure of measurement and adjustment.
-It demonstrates, referring also to FIG.

The assembled electromagnetic relay 1 is fixed to the fixing jig 8 (step S1), and the exciting coil 15 is energized (step S2). Then, the armature 14 is attracted to the yoke 16, and the movable contact 13 comes into contact with the fixed contact 11. In this state, the grip portion 10 of the tracing stylus 2 is engaged with the most free end of the movable member 9 (step S3). Stylus 2 at this time
Is the initial position of the probe 2.

Subsequently, the exciting coil 15 is demagnetized (step S4), and the gripper 10 is moved according to the subroutine shown in FIG. 9 to measure the stopper pressure P2 (step S4).
5). Here, the reaction force load acting on the grip portion 10 at the time when the movement amount of the grip portion 10 from the initial position reaches a predetermined value (L1 in FIG. 5) is taken in, and this value is used as the stopper pressure P2.
And Next, it is determined whether or not this stopper pressure P2 is within a predetermined allowable range (step S6). If it is determined that it is out of the allowable range, the number of adjustments so far is determined (step S7). If it is determined that the number of times is four or less, the adjustment amount is calculated and correction is performed according to the subroutine shown in FIG. 10 (step S
8). After that, the process returns to step S5 and the measurement of the stopper pressure P2 is repeated.

Since the stopper pressure P2 tends to have a relatively large variation and a large adjustment allowance, the adjustment amount is calculated and corrected as described below.

The number of adjustments determined in step S7 is 0,
That is, in the case of the first time, as the correction step in step S8, first, the base end portion 21 of the movable member 9 is bent by the movable member bending unit 19 by a predetermined angle. still,
This predetermined angle is an appropriate set value obtained based on an experiment, and is a fixed value that is bent regardless of the measured value obtained in step S5. Continued second stop pressure P
2 After performing the measurement, compare it with the previous measured value and calculate the required adjustment amount according to the following formula. Required adjustment amount RA = (| P-P21 | / | P22-P21 |) x
AF × C + R However, P: target value, P21: first measurement value, P22: second measurement value, AF: predetermined bending angle, C: correction constant, R: springback amount

After the correction is performed according to this value, the third measurement is performed. Then, based on this third measurement value, the second
Calculate the required adjustment amount for the first time according to the following formula. Required adjustment amount RA2 = (| P-P23 | / P23A) × RA2A where P23: third measured value, P23A: P2 up to 16 points before
Average value of 3, RA2A: average value of RA2 up to 16 points ago

At this time, in order to take into consideration the error tendency of each lot, the correction is made based on the average value up to 16 points ago. Incidentally, this correction value may be set to an appropriate value in the case of the first lot.

After the correction is performed according to this value, the fourth measurement is performed, and if the determination is still unsuccessful, the third adjustment is finely adjusted according to a preset quantitative adjustment amount.

When the pass judgment is made in step S6, it is considered that the adjusting process of the stopper pressure P2 is completed, and the exciting coil 15 is energized again, so that the armature 14 is moved to the yoke 16.
The movable member 9 to the suction end so that the free end of the movable member 9 is held by the grip portion 1
It is brought into contact with the claw portion on the opposite side of 0 (step S9). Then, the tracing stylus 2 is moved so as to return to the initial position, and the fixed contact 11 and the movable contact 13 are brought into contact with each other (step S1).
0).

In this state, the contact pressure P1 is measured according to the subroutine shown in FIG. 11 (step S11). Here, the grip portion 10 is further displaced while measuring the conduction between the fixed contact 11 and the movable contact 13. Then, when the conduction becomes 0, that is, when the movable contact 13 is separated from the fixed contact 11, the reaction force load acting on the grip portion 10 is taken in, and this value is taken as the contact pressure P1.

Next, it is determined whether or not this contact pressure P1 is within a predetermined allowable range (step S12). If it is determined that it is out of the allowable range, the number of adjustments so far is determined (step S13). If it is determined within 4 times, the adjustment amount is calculated according to the following equation (step S14), and the correction is performed according to this value (step S15). Then, returning to step S10, the contact point 2 is moved and the contact pressure P1 is repeatedly measured. Adjustment load = | reference value−measured value | Adjustment amount = (adjustment load / spring constant) + spring back amount × correction coefficient based on the number of adjustments However, the spring back amount depends on the experimental value.

When the pass judgment is made in step S12, it is considered that the adjustment process of the contact pressure P1 is completed, the grip portion 10 of the tracing stylus 2 is displaced through the load cell 3, and the fixed contact 11 to the movable contact 13 are moved. Force is applied in the direction to forcibly open. Then, when a predetermined load is applied to the grip portion 10, the original position of the grip portion 10 (point 0 in FIG. 4) is set (step S16).

Next, the coil 15 is demagnetized (step S1).
7), the gap dimension G is measured according to the subroutine shown in FIG. 12 (step S18). Here, the grip 1
The grip portion 10 is further moved while measuring the reaction force load P2 acting on 0. Then, when the load P2 acting on the grip portion 10 becomes 0 (position B in FIG. 6), that is, the movable contact 13 hits the stopper 12 and the engagement of the movable member 9 with the grip portion 10 is released. The moving distance of the grip portion 10 from the original position at the moment is taken in, and this value is used as the movable stroke of the movable contact 13, that is, the gap dimension G.

Next, it is determined whether or not the value G thus obtained is within the allowable range (step S19).
If it is determined that it is out of the allowable range, the number of adjustments so far is determined (step S20). If it is determined that the number of adjustments is less than four, for example, the adjustment value is calculated by the following equation (step S21). Gap G adjustment amount = measured value × correction coefficient based on the number of adjustments

Then, the gap is corrected according to this value (step S22), and then the process returns to step S18 to repeat the measuring operation.

On the other hand, when the result of the determination in step S19 is acceptable, as shown in FIGS. 13 and 14, the conduction between the fixed contact 11 and the movable contact 13 is measured and applied to the exciting coil 15. The voltage to be applied is changed stepwise in time steps, and the voltage at which the fixed contact 11 and the movable contact 13 contact each other and the voltage at which they separate from each other are measured (step S23). This value is compared with a predetermined reference value to determine pass / fail (step S24). If it is within the predetermined range, it is sent to the next step as a pass product (step S25), and if it is not passed, it is removed. Yes (step S26).

On the other hand, if the number of repeated adjustments is counted in step S7, step S13 and step S20 and the measured value does not fall within the allowable value even after the adjustment is repeated a predetermined number of times (4 times), the test fails. The product is removed (step S26).

In the present embodiment, products requiring adjustment beyond the fourth time are excluded as rejected products, but the number of times is not limited to this.

[0035]

As described above, according to the present invention, it is possible to achieve the automation of the measurement and correction of the manufacturing error of the contact portion of the electromagnetic relay. Therefore, it is possible to reduce manufacturing variations, improve reliability, and simplify quality control.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a device of the present invention.

FIG. 2 is an enlarged plan view of an essential part of the device of the present invention.

FIG. 3 is an enlarged perspective view of a main part.

FIG. 4 is a partial view for explaining measurement points.

FIG. 5 is a partial view for explaining measurement points.

FIG. 6 is a partial view for explaining measurement points.

FIG. 7 is a flowchart for explaining measurement and adjustment procedures.

FIG. 8 is a flowchart for explaining the procedure of measurement and adjustment.

FIG. 9 is a flowchart for explaining the procedure of measurement and adjustment.

FIG. 10 is a flowchart for explaining the procedure of measurement and adjustment.

FIG. 11 is a flowchart for explaining the procedure of measurement and adjustment.

FIG. 12 is a flowchart for explaining the procedure of measurement and adjustment.

FIG. 13 is a graph for explaining an operating voltage check.

FIG. 14 is a graph for explaining a return voltage check.

[Explanation of symbols]

 1 Electromagnetic relay 2 Measuring element 3 Load cell 4 Pulse motor 5 Rotary encoder 6 Base 7 Air cylinder 8 Fixing jig 9 Moving member 10 Grip 11 Fixed contact 12 Stopper 13 Moving contact 14 Armature 15 Excitation coil 16 Yoke 17 Fixed contact bending unit 18 Stopper Bending Unit 19 Movable Member Bending Unit 20 Chuck 21 Base End

Claims (1)

[Claims] 1. A pair of fixing members and an armature member that is located between the pair of fixing members and is attracted to an exciting coil, can be integrally displaced so as to elastically abut one fixing member, and the other fixing member. A moving device for forcibly displacing the movable member against the elastic force, which is an adjusting device for an electromagnetic relay having a movable member which is constantly urged toward the member with elastic force. An adjusting device for an electromagnetic relay, comprising: a force detecting device for detecting a force acting on the moving device; and a displacement detecting device for detecting a displacement amount of the moving device.