JPS6150676A - Vibrator for slack diagnostic device - 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] The present invention detects the degree of loosening of connecting members (test objects) such as Pol I~, knock bottles, rivets, etc. of general mechanical structures including rotor bars, models, coils, etc. of rotating electric machines. The present invention is used in a looseness diagnosing device, and relates to an accelerator that applies an impact to a test object.

[Technical background of the invention and its problems 1 The principle of this type of loosening diagnosis device is to calculate the maximum value FIlla× of the impact force applied when impact is applied to the test object and the maximum response acceleration of the test object. The ratio A max / to the value A max /
The degree of loosening of the test object is diagnosed based on the magnitude of the F max value.

Conventionally, as a vibrator for striking a test object and detecting the striking force, a so-called impulse hammer having a built-in force detection element has been used.

However, since this impulse hammer is struck by hand, it is not possible to strike at a fixed location or in a fixed direction.
Therefore, the accuracy of the data deteriorates, and when diagnosing a test object such as the inside of a motor stator, the work must be done in a narrow space, resulting in problems such as an awkward working posture.

[Purpose of the Invention] The present invention was made based on the above circumstances, and its purpose is to improve data accuracy and shorten work time by improving individual differences and workability when diagnosing looseness. An object of the present invention is to provide a vibrator for a loosening diagnostic device that can perform the following functions.

[Summary of the Invention] The vibration exciter used in the loosening diagnosis device according to the present invention includes an electromagnet in which a winding is wound around a fixed core, and an electromagnet that is provided opposite to the fixed core and generates "
A movable core that is attracted, a transmission rod that transmits the impact force caused by the collision between the movable core and the fixed core to the test object, and a transmission rod that is installed between the transmission rod and the movable core to detect force and acceleration. The configuration includes a sensor for

[Embodiment of the Invention] A vibrator for a loosening diagnosis device according to the present invention will be described below according to an embodiment shown in FIG.

In FIG. 1, 1 is the volume I wound on the bobbin 2! 3 and a fixed iron core 4 having one end disposed inside the bobbin 2.
It is an electromagnet made up of. 5 is a movable core provided opposite to the fixed core 4, and 6 is a restoring coil spring provided between the fixed core 4 and the movable core 5 to provide a restoring force to the movable core 5 after being attracted. 7 is a lid provided on the other open end of the fixed core 4, and 8 is a positioning coil spring provided between the lid 7 and the movable core 5 to position the movable core 5 during restoration. Numeral 9 is a lot that transmits the impact force generated when the movable core 5 collides with the fixed core 4 to a test object (not shown). Reference numerals 10 and 11 are force detection sensors and acceleration sensors provided between the rod 9 and the fixed core 4, and their electrical outputs are connected to cables IOA and 11A.
This will lead you to a looseness diagnostic device (not shown).

In the above configuration, when a DC voltage is applied to the winding 3, the electromagnet 1 is excited, and the movable iron core 5 is attracted to the fixed iron core 4 in the direction of arrow A by the magnetic attraction force. At this time, the movable core 5 is attracted while compressing the restoring coil spring 6, and finally collides with the fixed core 4, and the impact generated at this time becomes an excitation force that excites the test object via the lot 9. .

The excitation force at this time is detected by the force detection sensor 10, and the response vibration amount is detected by the acceleration sensor 11, and sent to the loosening diagnosis device for signal processing. When this signal processing is completed, the DC voltage is cut off, and the movable iron core 5 is restored to its original position by the restoring force of the restoring coil spring 6. The action of the positioning coil spring 8 prevents the movable core 5 from swinging, making it possible to use it in any direction with respect to the direction of gravity of the vibrator.

FIG. 2 shows how the rotor bar 2 of a rotating electric machine is vibrated by the vibrator 20 having the above configuration, and the amount of response vibration of the rotor bar 21 at this time is detected by the acceleration sensor 11 of the vibrator 20. 22 is a laminated iron core. In FIG. 2, a vibrator 20 generates an excitation force using a DC voltage, and this excitation force is transmitted through a rod 9 to vibrate the rotor bar 2. At this time, the excitation force transmitted through the rod 9 is detected by the force detection sensor 10, and is guided to a loosening diagnostic device (not shown) via a cable 10A.

On the other hand, the vibration of the rotor bar 21 subjected to the vibration is detected by the acceleration sensor 11 via the rod 9. The detected signal is guided to a looseness diagnosing device (not shown) through the cable 11A.

Figures 3(a) and 3(b) are examples of time waveforms of the impact force and response vibration acceleration obtained from the force detection sensor 10 and the acceleration sensor 11, respectively, and the loosening diagnosis device calculates the maximum absolute value of these waveforms. (FIIla×) and (AI
From IlaX), the ratio (Amax) / (Fn+ax
) to quantify the amount of loosening of the test object.

Next, another embodiment of the present invention will be described with reference to FIG. 4, in which the same parts as in FIG. 1 are given the same reference numerals.

That is, the vibrator shown in FIG. 4 is a direct type vibrator that directly transmits the impact force of the movable core 5 to the fixed core 4, whereas the vibrator shown in FIG. It is configured as an indirect type in which the signal is transmitted to the fixed iron core 4 after the signal has passed. Specifically, one end of the fixed core 4 is placed in place of the lid 7 in FIG. A buffer-absorbing coil spring 24 is installed between the movable iron core 5 and the movable iron core 5! It has an illuminating configuration.

According to this configuration, when a DC voltage is applied to the winding 3, the electromagnet 1 is excited, and the movable iron core 5 is attracted in the direction of arrow B by the magnetic attraction force while compressing the compression coil spring 23. Thereafter, by cutting off the DC voltage, the movable core 5 moves downward due to the restoring force of the compression coil spring 23 and collides with the fixed core 4, and the impact at this time becomes an excitation force that is transmitted to the lot 9. The test object will be vibrated. Here, the buffer absorption coil spring 24 is designed to prevent an error caused by the movable core 5 bouncing back after colliding with the fixed core 4, falling rtJ again, and colliding with the movable core 5.

The above embodiment also provides the effects of the embodiment shown in FIG. In addition, various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the present invention, an electromagnet having a winding wound around a fixed core, a movable core provided opposite to the fixed core and attracted by the excitation of the electromagnet, The present invention is equipped with a transmission rod that transmits the impact force caused by the collision between the movable iron core and the fixed iron core to the test object, and a sensor that is installed between the transmission rod and the movable iron core and detects force and acceleration. Therefore, it is possible to provide a vibration exciter for a loosening diagnosis device that can improve data accuracy and shorten working time by addressing individual differences and improving workability when diagnosing looseness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the vibration exciter for a loosening diagnosing device according to the present invention, and FIG. 2 is a cross-sectional view showing the operation of the same embodiment, and is a cross-sectional view for explaining the loosening diagnosis of a rotor bar. The perspective view and FIG. 3 are for explaining the operation of the same embodiment, and are waveform diagrams of the impact force when the rotor bar is struck and the response vibration of the rotor bar, and FIG. 4 is a diagram showing another embodiment of the present invention. FIG. 1... Electromagnet, 2... Bobbin, 3... Winding wire, 4...
...Fixed iron core, 5. Movable iron core, 6.. Restoration coil spring, 7.. Lid, 8.. Positioning coil spring, 9.
... Rod, 10... Force detection sensor, 11... Acceleration detection sensor, 23... Compression coil spring, 24...
Buffer absorption coil spring. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) Apply a blow to the connecting member as the test object, find the ratio of the maximum value of the signal corresponding to the amount of blow and the maximum value of the signal corresponding to the amount of response vibration from the test object, and calculate the ratio. A vibrator used in a loosening diagnostic device for diagnosing the degree of loosening of the test object based on its size includes an electromagnet with a winding wound around a fixed core, and an excitation of the electromagnet provided opposite to the fixed core. a movable core that is attracted by the movable core, a transmission rod that transmits the impact force caused by the collision between the movable core and the fixed core to the test object, and a transmission rod that is installed between the transmission rod and the movable core to transmit force and acceleration. A vibration exciter for a loosening diagnosis device, characterized in that it is equipped with a detection sensor. (2) The vibration exciter for a loosening diagnostic device according to claim (1), wherein the movable iron core is configured to respond to direct attractive force generated by excitation of the electromagnet. (3) A patent characterized in that the movable core is equipped with a compression coil spring that temporarily stores the attractive force generated by the excitation of the electromagnet as a compressive force, and causes the compressive force to collide with the fixed core by releasing the compressive force. A vibrator for a loosening diagnostic device according to claim (1).