JP3079301B2 - Oil dash pot operation test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a non-magnetic cylinder formed in a bottomed cylindrical body, a magnetic plunger reciprocable in the cylinder, a coil spring capable of biasing the plunger, Actuator mechanism for an overcurrent circuit breaker for wiring, etc., composed of brake oil capable of braking the plunger, and a magnetic armature engaged with a coil spring and pressed into an opening of the cylinder to seal the brake oil. The present invention relates to an operation test apparatus for an oil dash pot used in a vehicle. More specifically, an overcurrent circuit breaker automatically shuts off the electrical circuit and protects electrical equipment and circuit components from accidents when an overcurrent that exceeds the rating due to overload or short circuit occurs in the electrical circuit. The plunger (movable iron core) in the oil dash pot is moved by the magnetic force of the excitation coil provided around the oil dash pot to form a magnetic pole at the armature at the end of the oil dash pot. One end of the lever mechanism is adsorbed to mechanically turn off a switch that opens and closes the current supply to the secondary side of the overcurrent breaker. Before assembling, the operability of the plunger is tested and a good oil dash pot in which the plunger operates normally in the cylinder, poor sliding of the plunger, leakage of the coil spring, etc. Encapsulation leakage of the brake oil relate test device for the determination and the oil dash pot defective not operate normally due.

[0002]

2. Description of the Related Art As a conventional technique, for example, an operation test apparatus for an oil dash pot shown in FIG. 7 is known.
The configuration of this operation test device is as follows.

The U-shaped yoke 93 has an insertion hole 93a at the center of the upper plate, through which the oil dash pot 9 can be inserted, and protrudes from the lower surface of the center of the lower plate at a position facing the insertion hole 93a. The protrusion 93b is fixed, and the nonmagnetic support 9 is fixed.
6A, 96B are attached to the upper part. The support table 96
A and 96B are attached to the upper surface of the test table 92 made of a non-magnetic material. In the excitation coil 91, a nonmagnetic charging cylinder 94 into which the oil dash pot 9 can be inserted is fixed between the insertion hole 93a of the yoke 93 and the upper surface of the lower plate above the projection 93b, and the upper and lower sides are insulated on the outer periphery thereof. It is wound between members 95 and 95.

Further, the L-shaped hinge 97 is attached to the magnetically attached end 9.
7a is pivotally supported by the support base 96A at a position where it can come into contact with the projection 93b of the yoke 93, and the working end 97
b, a coil spring 9 is provided so as to urge the magnetically attached end 97a downward.
9 is attached. The micro switch 98 can be brought into contact with the working end 97b of the hinge 97, and when the magnetically attached end 97a of the hinge 97 comes into contact with the projection 93b of the yoke 93, the micro switch 98
Is activated and attached to the upper surface of the test table 92 at a position where the time integration of a timer (not shown) can be turned off.

The armature 5 press-fitted into the cylinder 1
The oil dash pot 9 is placed in the charging cylinder 94 such that the lower end surface of the oil dash pot contacts the upper surface of the lower plate of the yoke 93, and when an exciting current is applied to the exciting coil 91, a magnetic field is formed around the oil dash pot 9. Since magnetic flux passes from the plunger 2 of the oil dash pot 9 and the armature 5 to the magnetic path around the U-shaped yoke 93, the plunger 2 which is a movable iron core
Approaches the armature 5 against the elastic force of the coil spring 3 and the fluid resistance force of the brake oil 4.

Since the magnetic flux when the exciting current is constant is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5,
At the beginning of energization, the magnetic force is weak because the magnetic flux is small, and the magnetic flux increases as the plunger 2 approaches the armature 5, so the magnetic force increases. When the plunger 2 is attracted to the armature 5, the magnetic flux becomes maximum and the magnetic force increases. Is the largest. At the time when the magnetically attached end 97a of the hinge 97 is attracted to the projection 93b of the yoke 93, the lever force of the hinge 97, which acts on the magnetically attached end 97a by the attraction force of the magnetic flux, acts on the operating end 97.
This is when the lever force of the hinge 97 that is exerted by the elastic force of the coil spring 99 and the microswitch 98 on the position b becomes larger than the lever force.

The elastic force of the coil spring 99 depends on the winding length of the exciting coil 91, the sectional area of the yoke 93, the hinge 9
7 and the working end 97b with respect to the center of oscillation of
, The cross-sectional area of the plunger 2 and the armature 5 of the oil dash pot 9 to be tested, the prescribed value of the exciting current to be tested, and the like.

From the start of the test (the start of excitation current application) to the end of the test (the magnetized end 97a of the hinge 97 is moved to the yoke 93).
The relationship between the test operation time of the oil dash pot 9 up to the time when the oil dash pot 9 is adsorbed on the projection 93b and the actual operation time when the oil dash pot 9 is incorporated in the overcurrent breaker is as follows.
Relational data is created in advance for each defective product such as a non-defective product and no coil spring 3, no plunger 2, no brake oil 4, etc.
Based on a comparison between the test operation time and the actual operation time, a good oil dashpot that operates normally and a defective oil dashpot that does not operate properly are determined.

Next, a procedure for judging a normally operating good oil dashpot and a defective oil dashpot which does not operate normally by the conventional operation test apparatus is as follows.

Prior to the start of the operation test, the exciting current supplied to the exciting coil 91 is set to a specified value in advance, the integrated time of a timer (not shown) is reset to 0 (zero), and the armature 5 The oil dash pot 9 is previously placed in the charging cylinder 94 so as to be in contact with the upper surface of the plate.

At the start of the operation test, the excitation coil 9
When an exciting current preset to a predetermined value is applied to the coil 1, a magnetic flux flows from the plunger 2 and the armature 5 of the oil dashpot 9 to a magnetic path around the U-shaped yoke 93, and the magnetic force causes the plunger 2 to move to the armature. Approach 5 When the plunger 2 reaches a predetermined position, the magnetically attached end 97a of the hinge 97 is moved to the yoke 9 by the attractive force of the magnetic force of the magnetic flux.
3 and the working end 97 of the hinge 97
By pressing the actuator portion of the micro switch 98 by b, the time integration of the timer (not shown) is turned off, and the test ends. The accumulated time of a timer (not shown) from the start of the test to the end of the test is the test operation time. This is to determine the defective oil dash pot that does not work.

[0012]

The actuator section for interrupting the overcurrent of the overcurrent circuit breaker is configured as shown in FIG. The L-shaped yoke 83 has a support portion 83a capable of supporting a hinge 87 described later on an upper portion of a vertical plate, and a cylinder 1 of an oil dash pot 9 at an end portion of a lower plate.
And a crimping hole 83d capable of press-fitting the cylinder 1 of the oil dash pot 9 is formed on the upper surface side of the crimping hole 83b, so that the reinforcing member 83 is formed.
c is fixed.

The oil dash pot 9 comprises a non-magnetic cylinder 1 formed in a bottomed cylindrical body, a reciprocally movable magnetic plunger 2 having a small-diameter tip in the cylinder 1, and a plunger 2. A contact between a biasable coil spring 3, a brake oil 4 capable of braking the plunger 2, and a magnetic body that engages with the coil spring 3 and has a small-diameter portion press-fit into an opening of the cylinder 1 to seal the brake oil 4. The oil dash pot 9 is composed of the armature 5 and the lower portion of the cylinder 1 with the armature 5 up, being crimped to the crimp holes 83b and 83d of the yoke 83. The excitation coil 81 is wound around an outer periphery of a substantially central portion of the cylinder 1 of the oil dash pot 9.

The L-shaped hinge 87 has an engaging portion 87c formed so as to be swingable by engaging with the support portion 83a of the yoke 83, and the magnetically attached end portion 87a is connected to the oil dash pot 9a.
At a position where it can contact the armature 5 of the
The engaging portion 87c is pivotally movable at a position where the switch actuator portion of the overcurrent circuit breaker (not shown) can be pressed.
The coil spring 89 is locked above the working end 87b and the vertical plate of the yoke 83 so as to bias the magnetically attached end 87a upward.

When an exciting current is applied to the exciting coil 81, a magnetic field is formed around the oil dash pot 9, and the plunger 2 and the armature 5 of the oil dash pot 9 are formed.
The magnetic flux passes through the magnetic path around the L-shaped hinge 87 and the L-shaped yoke 83 from above, but in the overcurrent circuit breaker, when an overcurrent exceeding the rating flows through the exciting coil 81, the movable iron core A plunger 2 is provided with the elastic force of the coil spring 3 and the braking oil 4
Of the armature 5 at a speed according to the value of the magnetic flux corresponding to the value of the overcurrent exceeding the rating, against the fluid resistance of the armature 5
It is configured to approach.

The value of the magnetic flux flowing in the magnetic path is proportional to the value of the overcurrent, and is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5, so that when the value of the overcurrent is constant,
At the beginning of the flow of the overcurrent, the magnetic force is weak because the magnetic flux is small, and the magnetic force increases as the plunger 2 approaches the armature 5, so that the magnetic force increases, and the magnetic flux becomes maximum when the plunger 2 is attracted to the armature 5. The magnetic force is maximized. Hinge 8
7 is attracted to the armature 5 by the lever force of the hinge 87 acting on the magnetized end portion 87a by the attraction force of the magnetic flux of the magnetic flux, the coil spring 89 acting on the working end portion 87b. This is when the lever force of the hinge 87 exerted by the elastic force of the switch and the switch (not shown) is larger.

[0017] The overcurrent circuit breaker starts from the start of overcurrent application.
The magnetically attached end 87a of the hinge 87 is attracted to the armature 5 of the oil dash pot 9, and the operating time until the working end 87b of the hinge 87 presses a switch (not shown) by the leverage force to cut off the overcurrent. Is specified by JIS C-8370, for example, when the rated current of the circuit breaker is 30 A
Over 50 A, 4 minutes at an overcurrent of 200% of the rated current and 6 at an overcurrent of 125% of the rated current.
It is specified as 0 minutes.

The operation test apparatus for an oil dash pot according to the prior art has substantially the same configuration as that of an overcurrent breaker, so that the test time for the operation test of the oil dash pot is, for example, 200% of the rated current. A long test time of about 4 minutes was required at the current, and there was a problem that the working efficiency was low.

The determination of a good oil dashpot that operates normally and a defective oil dashpot that does not operate properly can be made by comparing the measured test operation time with the relation data between the actual operation time created in advance and the operator. However, there is a problem that an erroneous determination occurs due to a misunderstanding or the like because the determination is made in comparison.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. It is an object of the present invention to shorten the test time to improve the work efficiency, and to reduce the erroneous judgment due to misunderstanding by the operator. It is an object of the present invention to provide an operation test apparatus for an oil dashpot which does not occur.

[0021]

In order to achieve the above object, an operation test apparatus for an oil dash pot according to the first aspect of the present invention includes an oil dash pot formed on a U-shaped upper plate portion. A magnetic yoke member on which the oil dash pot can be placed with the armature as a lower end on the upper surface of the lower plate portion formed in a U-shape by drilling an insertion hole so that it can be inserted, and the yoke member A primary coil provided in a cylindrical shape around the mounted oil dash pot and applying a sine wave AC primary voltage; and a primary coil provided around a U-shaped vertical plate portion of the yoke member. A secondary coil in which a sine wave AC secondary voltage is induced by a sine wave AC primary voltage applied to the coil, and rectification, amplification, and digital conversion of the sine wave AC secondary voltage induced in the secondary coil Measure Data measuring means, the secondary voltage measured by the data measuring means is repeatedly stored for each measurement unit time, and the measured voltage difference between the current measured voltage and the previous measured voltage is compared with a preset reference voltage difference. Computing means for performing a comparison operation, and a determination result as to whether the plunger is a good oil dash pot in which the plunger operates normally in the cylinder or a defective oil dash pot in which the plunger does not operate properly according to a signal from the computing means. And a determination unit for displaying

In addition, the operation test apparatus for an oil dash pot according to the second aspect of the present invention is characterized in that the judgment result of the non-defective oil dash pot which operates normally and the non-defective oil dash pot which operates normally by the judging means is determined. Only the oil dash pot determined to be defective is turned on or off to identify the oil dash pot.

According to a third aspect of the present invention, there is provided an operation test apparatus for an oil dash pot, wherein the judgment result of a non-defective oil dash pot which operates normally and a defective oil dash pot which does not operate normally is judged by the judgment means. Only the oil dash pot determined to be defective is moved upward to identify it.

[0024]

The operation according to claim 1 of the present invention configured as described above will be described as follows.

When a primary coil provided around the oil dash pot is energized, a magnetic field is formed and an electromagnet is formed by the primary coil and the oil dash pot, and a U-shaped yoke member is formed from a plunger and an armature of the oil dash pot. Since the magnetic flux passes through the magnetic path around each magnetic body,
The plunger, which is the movable core of the electromagnet, approaches the armature against the elastic force of the coil spring and the fluid resistance force of the brake oil. The value of the magnetic flux flowing between the plunger and the armature is inversely proportional to the square of the gap distance between the plunger and the armature when the current value of the current supplied to the primary coil is constant. At the beginning of flow, the magnetic flux is small because the gap distance between the plunger and the armature is maximum, and the magnetic flux increases as the plunger approaches the armature, and the magnetic flux becomes maximum when the plunger is attracted to the armature.

Since the secondary coil is provided around the vertical plate portion of the yoke member, the secondary coil is constituted by the principle of an AC transformer. When a sinusoidal AC voltage is applied to the primary coil and a current flows, the yoke member Sinusoidal magnetic flux passes through it, and this flux interlinks and alternates with the primary coil and secondary coil. Therefore, the electromotive force is generated by the self-induction action in the primary coil and by the mutual induction action in the secondary coil. Is induced. Each electromotive force is proportional to the magnetic flux, and the electromotive force induced in the primary coil and the secondary coil is proportional to the number of turns of each coil. Accordingly, the secondary voltage induced in the secondary coil changes in proportion to the magnetic flux that changes (increases) as the plunger of the oil dash pot approaches the armature, so that the amount of movement of the plunger and the movement of the secondary coil A constant relationship is obtained with the secondary voltage.

The sine-wave AC secondary voltage induced in the secondary coil is rectified, amplified, digital-converted, etc. by the data measuring means, and the secondary voltage is repeatedly stored for every unit time of measurement by the calculating means. A good oil dashpot in which the plunger operates normally in the cylinder by the judging means by a signal from the calculating means by comparing and calculating the measured voltage difference between the measured voltage of the previous measurement voltage and the measured voltage of the previous time. Is displayed, or whether the oil dash pot is a defective oil dash pot that does not operate normally.

According to the second aspect of the present invention, the judgment result of the non-defective oil dashpot which operates normally and the non-defective oil dashpot which operates normally is judged as non-defective or defective. Turn on or off the lamp for the oil dash pot only to identify it.

According to a third aspect of the present invention, the judgment result of the non-defective oil dashpot which operates normally and the non-defective oil dashpot which operates normally is judged as non-defective or defective. Only the oil dash pot is moved upward to identify.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment according to claims 1 and 2 of the present invention will be described below with reference to FIGS. 1 to 3 and FIG.

FIG. 1 is a partial cross-sectional view showing a test section 10. A U-shaped yoke 13 has an insertion hole 13a through which the cylinder 1 of the oil dash pot 9 can be inserted at the center of the upper plate. Are attached to the upper surface of the non-magnetic insulating lower plate 18 and the lower surface of the insulating upper plate 17. In the primary coil 11, a non-magnetic charging cylinder 14 into which the oil dash pot 9 can be inserted is fixed between the insertion hole 13 a of the yoke 13 and the upper surface of the lower plate. It is wound around. The secondary coil 12 is wound around the center of the vertical plate of the yoke 13 and connected to the rectifier 41 of the data measuring unit 40 shown in FIG. The coil is heated during the operation test of the primary coil 11 and the secondary coil 12, and the winding resistance changes over time, causing a test error. Therefore, the coil is cooled by a cooling fan (not shown). The test section 10 is provided on the upper surface of the test table 16 shown in FIG.

FIG. 2 is a side view showing the configuration of the entire apparatus, in which an insulating lower plate 18 is attached to the upper surface of the test table 16 and an insulating upper plate 17 is attached above the insulating lower plate 18. The test section 10 is disposed between the lower insulating plate 18 and the upper insulating plate 17. For each stage from the first stage at the top of the slope to the third stage at the bottom, a first test unit 10 consisting of 30 units in each row
First-stage test unit 10A at the second stage, second-stage test unit 1 at the second stage
OB and a third-stage test unit 10C of the third stage are provided, respectively. In addition, the control panel 1
9 is provided with a display surface 19a. The reason why the three-stage test unit including the first-stage test unit 10A, the second-stage test unit 10B, and the third-stage test unit 10C is provided is that the primary coil 11 and the secondary coil 12 heated during the test are different from each other. This is because cooling is performed during the test of the first stage to reduce test errors.

FIG. 3 is a block diagram showing a control system, which is roughly composed of a setting section 20, a measurement start input section 30, a data measurement section 40, a calculation section 50, and a determination section 60. The setting unit 20 is provided on an operation panel (not shown) and includes a cut voltage setting device 21 for setting a range of a voltage not to be measured in an unstable region at the beginning of the test, a reference voltage difference setting device 22 for setting a reference voltage difference, and the like. Have been.

The measurement start input unit 30 is provided on an operation panel (not shown), and sets a reset push button 31 for extinguishing a judgment lamp, which will be described later, of a stage previously tested at the time of an operation test, and a high level signal generated at the start of the test. A T1 timer relay 32 for inputting a start of measurement by the operation of a T1 timer (not shown) provided to prevent the voltage from being measured during an operation initial cut time t1 shown in FIG.
6, a first-stage test unit 10A and a second-stage test unit 10
B and the first-stage relay 33 for inputting the measurement start of the stage to be tested in the third-stage test unit 10C of the third stage
a, a second-stage relay 33b and a third-stage relay 33c,
A measurement end is input by operating a T2 timer (not shown) for setting a measurement end time t2 shown in FIG.
It is composed of a timer relay 34 and the like.

The data measuring section 40 includes a rectifier 41 for rectifying a sine-wave AC secondary voltage output from the secondary coil 12 of the test section 10 to DC, and a voltage for amplifying the secondary voltage rectified by the rectifier 41. Amplifier 42 and voltage amplifier 42
From the first voltage of each stage by 30
It comprises an analog switch 43 for switching every channel up to the first channel, an A / D converter 44 for converting an analog secondary voltage to a digital secondary voltage, and the like. The calculation unit 50 exchanges data with the data measurement unit 40 and a determination unit 60 described later to perform calculation and storage.

The determination unit 60 includes a decoder (not shown), a waveform shaper 61 for shaping the waveform of the signal from the measurement start input unit 30, and a display surface 1 of the control panel 19 for displaying the determination result.
9a, a judgment lamp 62, a lamp driver (not shown) for lighting the judgment lamp 62, a cut voltage setting unit 21, a reference voltage difference setting unit 22, an A / D converter 44, a calculation unit 50, a waveform shaper 61, a decoder (not shown), a digital input / output unit 63 for inputting / outputting a signal to / from a lamp driver (not shown), and the like. The A / D converter 44 of the data measurement unit 40, the arithmetic unit 50, and the digital input / output unit 63 of the determination unit 60 are exchanged via the slot 51.

Next, the structure of the third embodiment will be described with reference to FIGS.

FIG. 4 is a partial cross-sectional view showing a test portion 70 according to claim 3 by changing the reference numerals of only those components which are not common to the test portion 10 of FIG. Insertion hole 73 through which oil dash pot 9 can be inserted in the center of the board
and a small insertion hole 73b through which a pressing element 75 to be described later can be inserted is formed in the lower plate substantially concentric with the insertion hole 73a, and attached to the upper surface of the nonmagnetic insulating lower plate 78 and the lower surface of the insulating upper plate 17. Have been. The primary coil 11 is inserted into the insertion hole 73a of the yoke 73.
A non-magnetic charging cylinder 14 into which the oil dash pot 9 can be inserted is fixed between the upper surface of the lower plate and the upper surface of the lower plate. The secondary coil 12 is wound around the center of the vertical plate of the yoke 73, as shown in FIG.
Is connected to the rectifier 41 of the data measurement unit 40 shown in FIG.

The solenoid 74 has an exciting coil 74b wound around a plunger 74a, and a press-fit hole 74c into which a pressing element 75 described later can be press-fitted at the tip of the plunger 74a.
And is attached to the lower surface of the insulating lower plate 78 at a position substantially concentric with the insertion small hole 73b of the yoke 73. To operate the solenoid 74, a solenoid driver (not shown) is provided in the determination unit 60 shown in FIG.
An OK signal is transmitted to a solenoid driver (not shown) of the determination unit 60 via the control unit 1 and the exciting coil 74b is excited to raise the plunger 74a as a movable iron core. The insulating lower plate 78 is provided with an insertion hole 78a through which a large-diameter portion of a pressing element 75 described later can be inserted substantially concentrically with the insertion small hole 73b of the yoke 73, and a press-fitting hole 74c of the solenoid 74, One small-diameter portion of a pressing element 75 having a large diameter at the center and small diameters at both ends is press-fitted so that the oil dash pot 9 can be pressed by raising the plunger 74a. The test sections 70 are disposed at the positions of the first-stage test section 10A to the third-stage test section 10C on the upper surface of the test table 16 shown in FIG.

Subsequently, the test procedure and operation of the embodiment according to claims 1 and 2 of the present invention will be described with reference to FIGS. 1 to 3 and 5 as follows.

In the operation test apparatus for an oil dash pot according to the present invention, a malfunction due to a small inner diameter of the cylinder 1 or a large outer diameter of the plunger 2 shown in FIG. The operation test is performed to prevent the defective oil dash pot 9 such as the operation failure due to the insertion failure of the spring 3 or the operation failure due to the leakage leakage of the brake oil 4 from being mixed with the normal operation. However, when the oil dash pot 9 in which the coil spring 3 is not inserted is left for a long time with the armature 5 up, the plunger 2 contacts the bottom of the cylinder 1 and the coil spring 3 is normally mounted. Since the operation is almost the same as that of the inserted coil spring 3, it is not possible to judge whether or not the coil spring 3 is inserted. For this reason, before starting the test, the armature 5 is left down for about 60 minutes or more in advance, and if the coil spring 3 is not inserted, the operation test is performed after the plunger 2 is brought into contact with the armature 5. I do.

In the test procedure, first, at the time of the operation test, the cut-off voltage setting unit 21 shown in FIG. 3 for setting the range of the voltage not to be measured in the unstable region at the beginning of the test is used for the measurement start cut-off voltage v1 shown in FIG. And a measurement voltage difference Δv between the current measurement voltage vy and the previous measurement voltage vx of the measurement voltage vn measured for each measurement unit time Δt shown in FIG. The reference voltage difference v2 of the reference voltage difference setting unit 22 shown in FIG. 3 and the high level voltage generated at the start of the test start are set so as not to be measured during the operation initial cut time t1 shown in FIG. An operation time of a T1 timer that is not used and an operation time of a T2 timer (not shown) that sets a measurement end time t2 shown in FIG.

Next, the armature 5 is placed downward on each of the thirty test portions 10 of the first stage test portion 10A to the third stage test portion 10C shown in FIG. The oil dash pot 9 is placed as shown in FIG.

Next, the reset lamp 31 shown in FIG. 3 turns off the judgment lamp 62 used in the previous test, and the first-stage test section 10A, 2
After designating the stage on which the oil dash pot 9 is placed among the stage test unit 10B and the third stage test unit 10C, a test start push button (not shown) is turned ON.

When a test start push button (not shown) is turned ON,
The primary coil 11 shown in FIG. 1 is excited to form a magnetic field around the oil dashpot 9, and the primary coil 11 and the oil dashpot 9 constitute an electromagnet. The electromagnet is formed from the plunger 2 and the armature 5 of the oil dashpot 9. Since the magnetic flux passes through the magnetic path around each magnetic body of the U-shaped yoke 13, the plunger 2, which is the movable core of the electromagnet, opposes the elastic force of the coil spring 3 and the fluid resistance force of the brake oil 4. Approach the armature 5. The value of the magnetic flux flowing between the plunger 2 and the armature 5 is inversely proportional to the square of the gap distance between the plunger 2 and the armature 5 when the current value of the current supplied to the primary coil 11 is constant. When the current flows through the primary coil 11, the magnetic flux is small because the gap distance between the plunger 2 and the armature 5 is the largest, and the magnetic flux increases as the plunger 2 approaches the armature 5, and the plunger 2 moves to the armature 5. The magnetic flux becomes maximum when attracted.

When a sine-wave AC voltage is applied to the primary coil 11 and an electric current flows, the secondary coil 12 is provided around the vertical plate portion of the yoke 13. Since a sinusoidal magnetic flux passes through 13 and this magnetic flux interlinks and alternates with the primary coil 11 and the secondary coil 12, the primary coil 11 performs a self-induction action, and the secondary coil 12 performs a mutual induction action. An electromotive force is induced in each case. Each electromotive force is proportional to the magnetic flux, and the electromotive force induced in the primary coil 11 and the electromotive force induced in the secondary coil 12 are proportional to the number of turns of each coil. Accordingly, the secondary voltage induced in the secondary coil 12 changes in proportion to the magnetic flux that changes (increases) as the plunger 2 of the oil dash pot 9 approaches the armature 5, and thus the amount of movement by which the plunger 2 operates And the secondary voltage of the secondary coil 12 has a certain relationship as follows.

FIG. 5 shows the operation time of the oil dashpot 9 when a primary voltage of 30 V is applied to the primary coil 11 and a current of 10 A flows, and the operation time is measured on the output side of the voltage amplifier 42 shown in FIG. FIG. 4 is a diagram showing the relationship between the secondary voltage and a non-defective product that operates normally (hereinafter referred to as a non-defective product);
(B) An example of a defective product which does not operate normally due to poor slidability due to a large outer diameter of the plunger 2 (hereinafter referred to as a defective sliding product), and (C) a plunger 2 which is a movable iron core is leaked. A defective product in which a magnetic field is not formed in the primary coil 11 and does not operate normally (hereinafter referred to as a defective product without a plunger);
(D) A defective product that does not operate normally due to the plunger 2 being in contact with the armature 5 before the start of measurement due to a missing coil spring 3 (hereinafter referred to as a defective product without a spring), and (E) the brake oil 4 Average relationship between oscillographic measurement data of defective products (hereinafter referred to as oil-free defective products) in which the plunger 2 is attracted to the armature 5 and does not operate normally in a very short time after the start of measurement due to leakage FIG.

The non-defective product of (A) rises at the secondary voltage of about 4.2 V at the start of measurement (marked with △), and starts at about 12 V from the start of measurement.
During sec, the operation is unstable due to a small magnetic flux and a slight movement of bubbles contained in the cylinder 1 because the gap distance between the plunger 2 and the armature 5 is long. The operation is stably continued from the place after 12 sec. Since the magnetic flux between the plunger 2 and the armature 5 increases in inverse proportion to the square of each gap distance, the secondary voltage increases according to the quadratic curve shown in FIG. Is attracted to the armature 5 and the operation is terminated at the position of the mark. The secondary voltage at this time is about 7.4 V, and the secondary voltage after the end of the operation (indicated by ○) should be balanced. However, the decrease in the winding resistance due to the heating of the primary coil 11 and the secondary coil 12. Only a small amount increases until the end of oscillographic measurement (marked with □).

From the data of the non-defective oscillograph of (A), the set values of the following items can be determined. In FIG. 5, the initial operation cut-off time t1 at which the high level voltage generated at the start of the test is not measured may be set in a very short time from the start of the test because the high level voltage is instantaneously stabilized. In the example, the operation initial cut time t1 = 3 sec is set by a T1 timer (not shown). The measurement end time t2 for terminating the measurement of the operation test for each stage is about 31 seconds from the start of the test to the time when the plunger 2 of the oil dash pot 9 is adsorbed by the armature 5 and the operation ends. Therefore, it is sufficient to set the time beyond this time. In this embodiment, the measurement end time t2 = 40 sec is set by a T2 timer (not shown) with a margin.

The measurement start cutoff voltage v1 for setting the range of the voltage not to be measured in the unstable region at the beginning of the test is approximately 5.1 V after the start of the test and enters the stable region at about 5.1V. The voltage difference between the initial voltage of about 4.3 V and the initial voltage of about 4.3 V at t 1 = 3 sec may be set to a value with a certain margin of 5.1-4.3 = 0.8 V. In this embodiment, the measurement start cut voltage v 1 = 1 .6V is set by the cut voltage setting device 21 shown in FIG. The current measurement voltage vy and the previous measurement voltage vx measured for each measurement unit time Δt
The difference between the measured voltage Δv and the reference voltage difference v2 for the arithmetic operation by the arithmetic unit 50 is the current measured voltage vy at the measurement unit time Δt = 0.3 sec 25 sec after the start of the measurement.
Voltage difference Δv = 0.03V between the previous measurement voltage vx and the previous measurement voltage vx
Then, after 27.5 seconds from the start of measurement, the measured voltage difference Δv
= 0.08 V, and the measured voltage difference Δv = 0.12 V after 30 seconds from the start of the measurement.
2 V. In this embodiment, the reference voltage difference v
2 = 0.10 V is set by the reference voltage difference setting unit 22.

[0051] The defective sliding product of (B) is measured at the start of measurement (△
Mark), the secondary voltage is about 4.2 V, which is the same level as that of the non-defective product of (A).
But the operating speed is slow due to poor slidability.
During a period of about 56 seconds from the start of the measurement, the operation is unstable because the gap distance between the plunger 2 and the armature 5 is long, so that the magnetic flux is small and the bubbles contained in the cylinder 1 move slightly. It operates stably from about 56 sec after the start of measurement, and
In 5 seconds, the plunger 2 is attracted to the armature 5 and the operation is terminated at the position indicated by the mark. Since the secondary voltage at this time has a long operation time, the voltage level of the secondary voltage is higher than that of the non-defective product of (A) by the decrease in the winding resistance due to the heating of the primary coil 11 and the secondary coil 12.

(C) The defective product without the plunger is the primary coil 1 because the plunger 2 which is the movable iron core is missing.
The magnetic flux due to 1 is extremely weak, and the secondary voltage is infinitely close to 0 (zero) V from the start of the measurement (marked with △). Since it does not make sense to measure for a long time, the oscillographic measurement is terminated (indicated by a square) about 63 seconds after the start of the measurement.

(D) The defective product without a spring is the coil spring 3
Since the plunger 2 is in contact with the armature 5 before the start of measurement due to leakage, and the magnetic flux between the plunger 2 and the armature 5 is in the maximum state, the measurement is started (marked with △). The secondary voltage suddenly rises at about 7.5 V, and as the time elapses thereafter, the secondary voltage slightly increases by an amount corresponding to a decrease in the winding resistance. To finish the oscillograph measurement (□
Mark).

The oil-free defective product (E) has no fluid resistance due to leakage of the brake oil 4, and the plunger 2 is adsorbed to the armature 5 in a very short time after the start of measurement. The voltage rises at the same level as the defective product without a spring (D) at about 7.5 V, almost at the same time as the start of measurement (marked with △), and as the time elapses, the secondary voltage slightly increases by the decrease in winding resistance. , Oscillograph measurement is completed in about 63 seconds from the start of measurement because it is meaningless to measure for a long time (marked with □)
It was made.

The measurement control system of the operation test apparatus according to the present invention is based on the above-mentioned relationship, and is measured as follows.

When a test start push button (not shown) is turned on, the secondary voltage of the secondary coil 12 is rectified from AC to DC by the rectifier 41 of the data measuring unit 40 shown in FIG. The data of each of the first to thirty test units 10 is switched to each channel by the analog switch 43, and the secondary voltage is converted from analog to digital by the A / D converter 44, and is converted via the slot 51. The operation initial cut time t
The initial voltage va and the initial voltage va + measurement start cut voltage v1 = measurement voltage vn data after the comparison calculation start voltage vb are not stored for 1 = 3 sec.

For example, if the oil dashpot 9 mounted on the Nath test section 10 is a non-defective product of (A), the initial voltage va + measurement start cut voltage v1 = comparison operation start voltage vb is calculated by the operation section 50. It is calculated and stored, and the measurement unit time Δt = 0.3 sec from the time point of the comparison calculation start voltage vb
Each time, the measured voltage vn is measured and stored in the arithmetic unit 50, and the measured voltage difference Δv between the current measured voltage vy and the previous measured voltage vx is repeatedly compared with the reference voltage difference v2 = 0.10V. The previous measurement voltage vx is automatically erased for each comparison operation, and the measurement voltage difference Δv> reference voltage difference v2 = 0.10
When the result of the comparison operation of V is obtained, the operation unit 50 sends the slot 5
1, the OK signal is transmitted to the determination unit 60. Then, a lamp driver (not shown) of the determination unit 60 shown in FIG.
Then, the Nath determination lamp 62 provided on the display surface 19a of the control panel 19 is turned on, and a measurement end lamp (not shown) is turned on by a T2 timer (not shown) after a measurement end time t2 = 40 sec from the start of the test, and an operation test is performed. Measurement ends.

If the oil dash pot 9 placed on the Nb-th test section 10 is a defective sliding product of (B), the initial voltage va + measurement start cut voltage v1 = comparison operation start voltage vb (shown in the figure). None) is calculated and stored by the calculation unit 50, but the comparison calculation start voltage vb is changed to the measurement end time t2.
= 40 sec, the measurement unit time Δt
= Comparison operation start voltage v
Since it is smaller than b, it is not measured and cannot be operated. Since the calculation is impossible, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 via the slot 51, and the measurement end time t2 = 40 without the Nb-th determination lamp 62 being turned on.
After sec, the measurement end lamp is turned on and the measurement of the operation test ends.

If the oil dash pot 9 mounted on the Nc-th test section 10 is a defective product without a plunger (C), the initial voltage va + measurement start cut voltage v1 =
The comparison calculation start voltage vb (not shown) is calculated and stored by the calculation unit 50, but the initial voltage va is infinitely 0 (zero).
Since V is close to V and the change with the passage of time is almost in an equilibrium state, the measurement voltage vn every measurement unit time Δt = 0.3 sec is smaller than the comparison calculation start voltage vb, so that the measurement is not performed and the calculation cannot be performed. Since the calculation is impossible, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 via the slot 51, and the measurement end lamp is turned on after the measurement end time t2 = 40 sec without turning on the Nc-th determination lamp 62. Then, the measurement of the operation test is completed.

If the oil dashpot 9 mounted on the Nd-th test section 10 is a defective product without a spring shown in (D), the initial voltage va + measurement start cut voltage v1 = comparison operation start voltage vb (shown in the figure). None) is calculated and stored by the calculation unit 50, but since the change with the passage of time after the initial voltage va is substantially in an equilibrium state, the measurement unit time Δt = 0.3
Since the measured voltage vn every second is smaller than the comparison calculation start voltage vb, the measurement is not performed and the calculation cannot be performed. Since the calculation is not possible, the determination unit 6
0, no OK signal is transmitted, and the Nd-th determination lamp 62
Without being turned on, the measurement end lamp is turned on after the measurement end time t2 = 40 sec, and the measurement of the operation test is ended.

If the oil dashpot 9 mounted on the Ne-th test section 10 is a defective product without oil (E), the initial voltage va + measurement start cut voltage v1 = comparison operation start voltage vb (shown in the figure). None) is calculated and stored by the calculation unit 50. As in the measurement of the springless defective product in (D),
Since the change due to the passage of time after the initial voltage va is substantially in an equilibrium state, the measurement voltage vn every measurement unit time Δt = 0.3 sec is smaller than the comparison calculation start voltage vb, so that the measurement cannot be performed and the calculation cannot be performed. Since the calculation is not possible, the OK signal is not transmitted from the calculation unit 50 to the determination unit 60 via the slot 51, and the measurement end lamp is turned on after the measurement end time t2 = 40 sec without lighting the Neth determination lamp 62. Then, the measurement of the operation test is completed.

After the measurement end lamps corresponding to all the first to thirty test units 10 are turned on and the measurement of the operation test is completed, the determination lamps 62 corresponding to each test unit 10 are turned on or off. The non-lighting was confirmed, and the illuminated oil dash pot 9 of the illuminated test section 10 was determined to be a good product. The oil dash pot 9 of the non-illuminated test section 10 was determined to be a defective product. In a storage box.

The operation test of the next and subsequent stages is a test repeatedly performed by the above-described procedure.

Subsequently, the test procedure and operation of the embodiment according to claim 3 will be described with reference to FIGS. 3 and 4.

For example, if the oil dash pot 9 placed on the Nath test section 10 is a non-defective product of (A), the result of the comparison operation is as follows: measured voltage difference Δv> reference voltage difference v2 = 0.10V. Then, an OK signal is transmitted from the calculation unit 50 shown in FIG. 3 to the lamp driver (not shown) of the determination unit 60 via the slot 51, and at the same time, the solenoid driver (not shown) provided in the determination unit 60 is also transmitted. An OK signal is transmitted. Then, at the same time when the Nath determination lamp 62 is turned on, the plunger 74a of the solenoid 74 shown in FIG.
, The oil dash pot 9 is moved upward, and a measurement end lamp (not shown) is turned on by a T2 timer (not shown) after the measurement end time t2 = 40 sec from the start of the test, and the measurement of the operation test is ended.

When the oil dash pot 9 is defective, the OK signal is not transmitted, so that the oil dash pot 9 is not moved upward.

After the measurement end lamps corresponding to all of the first to thirty test units 10 are turned on to complete the measurement of the operation test, the judgment lamps 62 corresponding to each test unit 10 are turned on and turned off. Oil dash pot 9 rises,
Alternatively, the non-lighting of the determination lamp 62 and the non-elevation of the oil dash pot 9 are confirmed, and the illuminated oil dash pot 9 of the test part 10 which is lit and raised is a good product. 9 is determined as a defective product, and the non-defective product and the defective product are sorted and stored in respective storage boxes, for example.

However, when determining whether the oil dash pot 9 is non-defective or defective, the determination is more accurate than the determination based on only the lighting or non-lighting of the determination lamp 62, and the non-defective and defective products are sorted and distinguished into respective storage boxes. Mixing can be prevented when storing.

The invention described in claim 1 of the present application provides, for example, a pick-and-place (not shown) that can hold and transfer the oil dash pot 9 placed on the test section 10 and a determination section 60. A pick-and-place driving means (not shown) capable of driving the pick-and-place is provided, and a non-defective oil dashpot 9 in which the plunger 2 operates normally in the cylinder 1 by a signal from the arithmetic unit 50, or An operation test apparatus for an oil dash pot configured to select a non-defective product from a defective product based on a result of determination as to whether the oil dash pot 9 is a defective product that does not operate.

[0070]

Since the present invention is configured as described above, the following effects can be obtained.

A U-shaped magnetic yoke member, a primary coil for applying a primary voltage, a secondary coil for inducing a secondary voltage, data measuring means for measuring a secondary voltage, A calculating means for repeatedly storing the next voltage for each measurement unit time, comparing the measured voltage difference between the current measured voltage and the previous measured voltage with a preset reference voltage difference, and normally operating by a signal from the calculating means. It is provided with a judgment means for displaying a judgment result of whether it is a good oil dash pot that operates or a defective oil dash pot that does not operate normally, so that a large number of oil dash pots are provided. The operation test can be carried out with the device mounted thereon, and there is an effect that wasted time such as waiting for the operation test is reduced, and the work efficiency can be improved.

Further, the voltage level and time measured by the present apparatus can be determined from the relation diagram between the voltage and time at which the oil dashpot operates by the current flowing through the primary coil. The operation test can be performed in a short period of time by increasing the number of turns of the primary coil or increasing the number of turns of the primary coil, thereby improving the working efficiency.

The result of the judgment by the judging means may be determined by turning on or off the lamp for only the oil dash pot judged as good or defective, or only the oil dash pot judged as good or defective. Has been moved upward to identify, so that there is no need for the operator to read the numerical data and determine it in comparison with the standard,
There is an effect that it is difficult for non-defective products and defective products to be mixed due to an operator's misunderstanding or the like.

Further, a pick-and-place (not shown) capable of gripping and transferring the oil dash pot placed on the test section, and a pick-and-place driving means (not shown) capable of driving the pick-and-place as the determination means. A non-defective product and a non-defective product are determined according to the result of determining whether the oil dash pot is a non-defective oil dash pot that operates normally by a signal from the arithmetic means or a defective oil dash pot that does not operate normally. Therefore, there is an effect that non-defective products and defective products are not mixed due to misunderstanding of an operator.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a test section of an embodiment according to the present invention.

FIG. 2 is a side view showing the entire configuration of the embodiment according to the present invention.

FIG. 3 is a block diagram showing a control system according to an embodiment of the present invention.

FIG. 4 is a partial sectional view showing a test section according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a relationship between an operation time of an oil dash pot and a secondary voltage according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an actuator section that interrupts an overcurrent of the overcurrent breaker.

FIG. 7 is an explanatory view of an operation test apparatus for an oil dash pot according to a conventional technique.

[Explanation of symbols]

 [Signs according to the invention of the present application] 2 plunger 5 armature 9 oil dash pot 10 test unit 11 primary coil 12 secondary coil 13 yoke 20 setting unit 30 measurement start input unit 40 data measurement unit 50 arithmetic unit 60 judgment unit 70 test unit 73 yoke 74 solenoid [reference to overcurrent breaker] 81 excitation coil 83 yoke 87 hinge [reference according to conventional technology] 91 excitation coil 93 yoke 93b protrusion 97 hinge 98 micro switch

Claims (3)

(57) [Claims] 1. An operation test apparatus for an oil dash pot used for an actuator mechanism of an overcurrent circuit breaker, wherein an insertion hole is formed in a U-shaped upper plate so that the oil dash pot can be inserted. A magnetic yoke member on which the oil dash pot can be mounted with the armature at the lower end on the upper surface of the lower plate portion formed in a U-shape, and the oil dash pot mounted on the yoke member A primary coil that is provided in a cylindrical shape around and applies a primary voltage of a sine wave AC, and a sine wave AC applied to the primary coil that is provided around a U-shaped vertical plate portion of the yoke member. A secondary coil in which a sine-wave AC secondary voltage is induced by the primary voltage, and a data measuring means for measuring the sine-wave AC secondary voltage induced in the secondary coil by rectifying, amplifying, digitally converting, etc. When Calculating means for repeatedly storing the secondary voltage measured by the data measuring means for each measurement unit time and comparing and calculating the measured voltage difference between the current measured voltage and the previous measured voltage with a preset reference voltage difference And a good oil dash pot in which the plunger operates normally in the cylinder by a signal from the arithmetic means, or
An operation test apparatus for an oil dash pot, comprising: a judgment means for displaying a judgment result as to whether or not the oil dash pot is a defective product that does not operate normally. 2. The method according to claim 1, further comprising the step of determining whether or not the oil dash pot of the non-defective product which does not operate normally and the oil dash pot of the non-defective product by the judging means are determined. 2. The operation test device for an oil dash pot according to claim 1, wherein the device is turned on or off to be identified. 3. The result of the determination of a non-defective oil dash pot which operates normally and a non-defective oil dash pot which operates normally is moved upward only by the oil dash pot which is determined to be non-defective or defective. 3. The operation test device for an oil dash pot according to claim 1, wherein the operation test device is configured to identify the operation of the oil dash pot.