JPH028185Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a torsional vibration measuring device for a rotating shaft.

In the conventional torsional vibration measuring device, as shown in the perspective view of FIG.
Acceleration detectors 01a, 01b are installed axially symmetrically, and the acceleration detectors 01a, 01b are connected in parallel.
Terminal 02 coming out from b, 03c, 03d
a, 02b, 02c, 02d, and slip rings 03a, 03b, 03c, 03d,
Brushes 04a, 04b, 04c, 04 from the stationary side
d is pressed against the brushes 04a, 04b, 04
The rear ends of c and 04d are connected to the amplifier 05 with a cord, and the acceleration detectors 01a and 01b are connected to the amplifier 05.
Voltage is supplied through the brushes 04a, 04c and the slip ring.

Therefore, when the rotating shaft 06 rotates and torsional vibration occurs, the acceleration detectors 01a and 01b output a voltage signal proportional to the torsional acceleration vibration, and this output is transmitted to the slip rings 03b and 03d and the brush 04.
b, 04d and the amplifier 05.

However, in such a torsional vibration measurement device, torsional vibration is detected as an acceleration value that differs depending on the shaft diameter of the rotating shaft being tested, so calculation analysis must be performed each time according to the shaft diameter. Moreover, the work of attaching the acceleration detector, slip ring, etc. to the rotating shaft is extremely troublesome and time-consuming.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide an apparatus for measuring torsional vibration of a rotating shaft that is easy to measure.

To this end, the present invention incorporates a pair of accelerometers axially symmetrically in the center, and has a slip ring protruding from one end in the axial direction, while the other end can be attached and detached coaxially to the end of the rotating shaft to be tested. It is characterized by comprising a rotating part that is fixed, and a fixed part that surrounds the slip ring part and is coaxially rotatably pivoted to the rotating part and has a built-in brush part that slides on the slip ring part. shall be.

An embodiment of the present invention will be explained with reference to the drawings.
2 is a side view thereof, FIG. 3 is a partially enlarged perspective view showing the attachment of FIG. 2, and FIG. 4 is a connection circuit diagram of a torsional vibration accelerometer built into the attachment of FIG. 3.

In the above figure, reference numeral 11 is a device according to the present invention, and the device 11 is composed of a rotating part 2 and a stationary part 4 that are rotatably connected to each other on the same axis as described later. It is fixed to the shaft end of the rotating shaft.

First, the rotating part 2 is formed by a relatively large-diameter cylindrical part, a hexagonal part 7 chamfered on the same axis at the right end, and a relatively small-diameter slip ring part protruding on the same axis at the left end. There is.

1a and 1b are a pair of torsional vibration accelerometers built into a cylindrical part and arranged axially symmetrically on the same circumference, and 3a, 3b, 3c, and 3d are connected in parallel as shown in FIG. Connected accelerometers 1a, 1b
The slip-ring terminal 6 is an axial screw hole cut into the right end of the hexagonal part 7, and the rotating part 2 is screwed into the axial threaded part protruding from the shaft end of the rotating shaft 8 to be tested. It is for fixation.

Next, the stationary part 4 is formed of a cylindrical member that surrounds the slip ring part and whose right end is rotatably attached to the left end of the rotating part 2 around the same axis. A moving brush is provided.

5a, 5b, 5c, and 5d are external connection terminals of brushes built into the stationary part 4, respectively; 9 is an amplifier;
Reference numeral 10 denotes a rotation prevention arm protruding from the stationary part 4 in the radial direction.By fixing the other end of the rotation prevention arm 10, the stationary part 4 can be kept stationary despite the rotation of the rotating part 2. It is something.

In such a device, the rotating part 2 of the device 11 is connected to the rotating shaft 8 to be tested by screwing the screw hole 6 into the screw on the rotating shaft to be tested and inserting a wrench into the hexagonal part 7 and rotating it. At the same time, the stationary part 2 is fixed with a rotation prevention arm 10, and external connection terminals 5a, 5c, Voltage is supplied via the brush, slip ring and slip ring terminals 3a, 3c.

Then, when the rotating shaft 8 to be tested rotates and torsional vibration occurs, the two accelerometers 1a and 1b generate an electric signal proportional to the torsional vibration acceleration, and this electric signal is transmitted to the slip ring of the rotating part 2. terminal 3
b, 3d via the slip ring and brush to the external connection terminals 5b, 5d of the stationary part 4,
The signal is amplified by the amplifier 9 and output.

At this time, since the centrifugal force generated by the rotation of the rotary shaft 8 is canceled by combining the two accelerometers 1a and 1b in a parallel bridge, it does not adversely affect the measurement.

Thus, the measured torsional vibration angle θ is determined by the following formula.

θ=α/ω ² r (rad) α: Torsional vibration acceleration value r: Accelerometer mounting radius ω: Rotational angular velocity of shaft (rad/sec) By using a single attachment, attachment to the shaft end is extremely easy, and the measured torsional vibration acceleration can be converted into a torsional vibration angle using a relational formula, regardless of the size of the target shaft diameter.

In short, according to the present invention, a pair of accelerometers are built in the central part axially symmetrically, a slip ring part is provided protruding from one end in the axial direction, and the other end can be attached and detached coaxially to the end of the rotating shaft to be tested. and a fixed part that surrounds the slip ring part and is coaxially rotatably pivoted to the rotating part and includes a brush part that slides on the slip ring part. The present invention is extremely useful industrially because it provides a device for measuring torsional vibration of a rotating shaft that is easy to measure.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a known torsional vibration measuring device, Fig. 2 is a side view showing an embodiment of the present invention, Fig. 3 is a partially enlarged perspective view showing the slip ring portion of Fig. 2, and Fig. 4 The figure is a connection circuit diagram of the torsional vibration accelerometer shown in FIG. 1. 1a, 1b... Accelerometer, 2... Rotating part, 3
a, 3b, 3c, 3d...slip ring terminal,
4... Stationary part, 5a, 5b, 5c, 5d... External connection terminal, 6... Screw hole, 7... Hexagonal part, 8...
Rotating shaft, 9... Magnifier, 10... Anti-rotation arm, 1
1... This device.

Claims (1)

[Scope of utility model registration request] A pair of accelerometers are built in the center part axially symmetrically, a slip ring part is provided protruding from one end in the axial direction, and the other end is a rotating part that is coaxially and removably fixed to the end of the rotating shaft to be tested. , a fixing part that surrounds the slip ring part and is coaxially rotatably pivoted to the rotating part, and includes a built-in brush part that slides on the slip ring part. Vibration measurement device.