JPS6241340B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention makes it possible to perform fatigue tests on a large number of mainspring springs under the same test conditions and to cope with different types of mainspring springs. This article relates to a fatigue testing machine for mainspring springs that enables stress-free testing.

Conventionally known mainspring spring fatigue testing machines use one motor to repeatedly apply stress to a single mainspring, and it is difficult to test a large number of specimens under the same test conditions. In addition, the type of test piece was limited to ordinary uniaxial type mainspring springs, and it could not be applied to new types of mainspring springs (for example, biaxial type mainspring springs).

The present invention replaces such conventional testing machines,
The purpose of this product is to provide a mainspring spring fatigue tester that can accurately perform fatigue tests on a large number of test mainspring springs under the same test conditions, and that can also be used even if the mainspring springs are of different types. be.

As shown in the embodiment of the drawings, the mainspring spring fatigue tester of the present invention has a number of identical test units connected to one motor, and each test unit rotates the test spring piece 1 in opposite directions. A pair of spring winding tools 2 and 3 adapted to wind the spring in the direction
, rotating shafts 4 and 5 that independently support the spring winding tools 2 and 3, a belt 6 whose one end is wound around one rotating shaft 5, and a belt 6 that is wound around one end of the rotating shaft 4; It consists of a string material 8, one end of which is wound in the opposite direction to the belt 6, and a weight 7 attached to the other end, and a counter 9 for counting the number of times the test spring piece 1 is wound. There is. The other end of the belt 6 in each test unit is connected to a belt winding means 11 attached to a common power transmission shaft 10. The V-belt 14 is connected to the rotating shaft 13 of one motor 15 via the V-belt 12 .

The detailed structure and operation of these devices will be explained below with reference to the drawings.

The spring winding tools 2 and 3 are rings that are detachably attached to the rotating shafts 4 and 5 that are parallel to each other as shown in FIG.
This is done by bolts 16 and 17 on the shaft ends of and 5.
The rotating shafts 4 and 5 are rotatably supported by a fixed frame 18 via bearings. Spring winding tool 2 depending on the type and shape of the test mainspring
and 3 select appropriate ones and set them. In the illustrated example, a small-diameter ring winding tool 2 and a large-diameter ring winding tool 3 are used, and one end of the mainspring piece 1 is fixed to the small-diameter ring winding tool 2 along the direction of the mainspring winding. An example is shown in which the other end of the mainspring piece 1 is pulled out from the mainspring piece 1 and fixed to the winding tool 3 of a large diameter ring with a screw 19 with the winding direction reversed. By setting this test mainspring, the rotating shaft 4
and 5 will transmit rotational force to each other. That is, when the winding tool 2 is rotated in the direction to wind the main spring, the winding tool 3 is rotated in the opposite direction, and when the winding tool 3 is rotated in the direction to wind the main spring, the winding tool 3 is rotated in the opposite direction. The winding tool 2 is rotated in the opposite direction. The principle of the testing machine of the present invention is to apply repeated winding and unwinding motions to the mainspring spring winders 2 and 3 in this manner, thereby repeatedly applying stress to the mainspring spring. This test measures the fatigue strength (number of times stress is applied) due to repeated stress application, and is designed to allow this test to be performed simultaneously on a large number of specimens under the same conditions.

This repeated application of stress is performed using power and gravity. More specifically, a unidirectional rotational force is applied to one rotating shaft 5 by an electric motor, and during a rest cycle of this rotational force, a unidirectional rotational force is applied to the other rotating shaft 4 by gravity. This causes a cyclic motion that imparts rotational force. At this time, power transmission between the two rotating shafts 4 and 5 was performed by the test spiral spring itself, and no other power transmission mechanism was used. Therefore, when the test mainspring spring breaks, power transmission to both rotating shafts 4 and 5 is cut off.

Application of rotational force by power is performed by belt 6, and application of rotational force by gravity is performed by string material 8. In the illustrated embodiment, one end of the belt 6 is locked to the rotating shaft 5 and wound around the rotating shaft 5, and a string material 9 on which a weight 7 is suspended is connected to the rotating shaft 4 by the belt 6. is wound in the opposite direction.

As shown in FIG. 2, the other end of the belt 6 is a belt winding means 11 (belt winding frame) of the power transmission shaft 10.
When the other end of the belt 6 is wound around the belt winding means 11, one end of the belt 6 (FIG. 1) is unwound from the rotating shaft 5. rotates. As the rotating shaft 5 rotates, the spring winding tool 3 rotates in the same direction, and the spring winding tool 3 winds up the test mainspring spring piece 1. At that time, the test mainspring spring piece 1 is unwound from the spring winding tool 2 which is wound in the opposite direction to this winding direction,
This causes the spring winding tool 2 to rotate in the opposite direction to the spring winding tool 3. Along with this rotation, the rotation axis 4
also rotates in the same direction, and the string material 8 is wound onto it. On the other hand, although the details will be described below, when the power applied to the belt 6 is released, the belt 6 rotates in the opposite direction due to the gravity of the weight of the string material 8 and the spring action of the main spring spring 1. . By repeating this cycle, the fatigue strength (number of cycles) leading to breakage of the mainspring spring is measured, and this number of cycles is measured by the counter 9. In the illustrated embodiment, a rubber string 20 is wound around the rotating shaft 5, and the counting arm 21 of the counter 9 is rotated by the rubber string 20, and the number of rotation cycles of the rotating shaft 5 in one direction is measured. It is designed to measure.

As shown in FIG. 3, a large number of test units configured in this manner are arranged side by side so that they can operate together with one motor 15. In reality, a triangular frame 23 as shown in Fig. 2 is constructed on the test table 22, and each test unit is arranged on the inclined surface of this triangular frame, and the test units are arranged horizontally above this frame. Belt winding means 11 are arranged in parallel with the installed power transmission shaft 10 with a predetermined gap, and the belt 6 of each test unit is attached to these belt winding means 11.
It is best to wind up the other end.

Power transmission shaft 10 transmits its power to rotating shaft 13 of motor 15 via clutch 12 . That is, the power transmission shaft 10 and the motor shaft 13 are
The rotation is transmitted by the V-belt 14 to pulleys 25 and 26 attached to each, and a clutch 12 is interposed between the motor 13 and the pulley 26. When the clutch 12 is released, the pulley 26, the pulley 25, and the power transmission shaft 10 are all released from the power, and the unwinding force of the belt 6 is applied to the belt winding means 11 (the force of the weight 7 and the test spring piece). Opposite force based on restoring force)
acts, allowing it to rotate freely in the opposite direction.

This clutch 12 is an electromagnetic clutch, and a timer 27 is used to repeat the engagement and disengagement at predetermined time intervals. A variable speed motor is used as the motor 15, and its start/stop is controlled by switch 2.
8.

To further explain the overall test operation, in each test unit, the mainspring spring piece 1 to be tested is set in the winding tools 2 and 3 as described above. Motor 15 continues to rotate continuously during the test, but timer 2
7, the electromagnetic clutch 12 is repeatedly engaged and disengaged at predetermined time intervals. timer 27
When the electromagnetic clutch 12 is ON and connected,
The rotation of the motor is transmitted to the common power transmission shaft 10, and each belt winding means 11 rotates to wind up each belt 6 at the same time, and the test spring piece 1 wound around the winding tool 2 It is wound up by the winding tool 3 in the opposite winding direction. Along with this, the string material 8 is also wound around the rotating shaft 4 and the weight is raised, and the cant arm 21 also rotates, and when it rotates to a predetermined position, the counter 9 counts.

When the timer 27 is then turned off, the electromagnetic clutch 12 is released and the rotation of the motor 15 is disconnected. In this state, the rotating shaft 4 rotates in the opposite direction due to the gravitational action of the weight 7 and the restoring force of the spring piece 1 wound around the winding tool 3.
This rotation is transmitted to the rotating shaft 5 via the spring piece 1, and the belt 6 is wound around the rotating shaft 5, and the other end of the belt 6 is unwound from the belt winding means 11. In this case, the power transmission shaft 10, pulley 25, and pulley 26 will idle. In this case, the count arm 21 also returns to its original state.

In this way, as the timer repeats ON and OFF, the electromagnetic clutch 12 repeats the engagement and disengagement cycle, and as a result, the test mainspring spring piece 1 is repeatedly stressed in each test unit, and its fatigue life is increased. is measured by each counter 9. When the fatigue life is reached and the spring piece 1 breaks, the connection between the rotating shaft 4 and the rotating shaft 5 will be severed in the test unit, and the rotating shaft 5 will no longer rotate repeatedly, so the count arm 21 However, the repeated operation does not occur and the count ends. This final count is the measured value of fatigue life. In addition, even if this spring piece 1 is broken, if other test units are still continuing the test operation, the belt winding means 11 will repeat the rotation, but the belt 6 of the broken unit will become slack. In this state, sufficient tension to transmit rotational force to the rotating shaft 5 is lost, and as a result, it is no longer possible to apply rotational force to the count arm 21, and the counting operation stops.

As described above, according to the testing machine of the present invention,
Fatigue tests on a large number of mainspring springs can be performed under the same test conditions using one power source, and highly reliable measured values can be obtained. In addition, with this testing machine, fatigue tests can be easily performed not only on single-axis type mainspring springs but also on two-axis type mainspring springs. Since it is self-constructed, there is less mechanical load and less chance of failure, making it possible to obtain accurate data.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a mainspring spring testing unit according to the present invention, Fig. 2 is a side view of the same test unit, and Fig. 3 is a front view of a fatigue testing machine according to the present invention in which each test unit is arranged side by side. It is a diagram. 1... Test mainspring spring, 2... Winding tool, 3...
... Winding tool, 4... Rotating shaft, 5... Rotating shaft, 6...
Belt, 7... Weight, 8... String material, 9... Counter, 10... Power transmission shaft, 11... Belt winding means, 12... Clutch, 13... Motor rotating shaft, 14... V Belt, 15...Motor, 27
……timer.

Claims (1)

[Scope of Claims] 1. A pair of spring winding tools 2 and 3 configured to wind the test spring piece 1 in opposite directions, and a rotating mechanism that independently supports the spring winding tools 2 and 3. shafts 4 and 5, a belt 6 having one end wound around one rotating shaft 5, one end wound around the other rotating shaft 4 in the opposite direction to the belt, and a weight at the other end. A test unit is constituted by the string material 8 to which the belt 7 is attached, and a counter 9 for counting the number of windings of the test spring piece 1, and the other end of the belt 6 in this test unit is Power transmission shaft 1
each connected to the belt winding means 11 attached to the
This power transmission shaft 10 is connected to a motor shaft 13 via a clutch 12 that can be repeatedly attached and detached to a mainspring spring fatigue tester. 2. The fatigue testing machine according to claim 1, wherein the clutch 12 is an electromagnetic clutch with a timer. 3. The fatigue testing machine according to claim 1 or 2, wherein the rotational power of the motor is transmitted to the power transmission shaft 10 via the belt 14.