JPH0244184Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is based on vibrations in the axial direction of the rotating shaft, so-called
This invention relates to a device that measures longitudinal vibration.

Conventionally, when measuring the longitudinal vibration of a rotating shaft, a displacement meter is used as shown in FIG. 1. 01 in the diagram
02 is a displacement meter installed facing the end surface 01A of the rotation shaft 01. This displacement meter is fixed to the stationary part F and measures the distance from the end surface 01A of the rotation shaft 01. 03 is an amplifier that amplifies the output of the displacement meter 01, and 04 is an instrument that converts the output into distance (displacement) and displays or records it.

In such a device, when the rotating shaft 01 vibrates in the axial direction while rotating, the distance between the end surface 01A and the displacement meter 02 changes. Displacement meter 02 detects this change and displays it on meter 04 via amplifier 03.
As a result, the longitudinal vibration of the rotating shaft 01 is displayed (recorded). When measuring the longitudinal vibration of the rotating shaft of a diesel engine installed on a ship, etc., the stationary part F to which the displacement meter 02 is fixed is Because it resonates with the vibrations of diesel engines and the like and vibrates with its own vibrations, it was only possible to measure the relative vibrations between the displacement meter 02 and the rotating shaft 01.

The longitudinal vibration measuring device of the present invention consists of a rotor of a slip ring attached almost coaxially near the end of a rotating shaft, a stator of a slip ring fixed to a stationary part facing the rotor, and a stator of a slip ring fixed to a stationary part facing the rotor, and a position approximately at the axis of the rotor. The device consists of an accelerometer fixed to detect acceleration in the axial direction of the rotating shaft, and a measuring device that receives the output of the accelerometer taken out through the slip ring. Since the displacement meter 02 is directly detected, unlike the conventional
It becomes possible to measure the absolute longitudinal vibration of the rotating shaft without being influenced by the vibration of the stationary part F that is fixed.

An embodiment of the present invention shown in FIG. 2 will be described below. Reference numeral 2 denotes a cylindrical slip-ring rotor, which has a female thread 2A cut coaxially from one end surface, and a spanner hook 2B formed on the outer periphery. Further, the ring 2C is also coaxially attached to the end surface opposite to the female thread 2A.

3 is a stator of a slip ring, which is made up of a base 3A fixed to a stationary part F facing the rotor 2, and a ring 2.
It consists of a brush 3B that comes into contact with C.

Reference numeral 4 denotes an accelerometer, which is installed inside the rotor 2 at approximately the axial center position, and is determined so that the direction in which the acceleration is sensed is directed toward the axial center. Note that the input line and output line 4A of the accelerometer are connected to the ring 2C of the slip ring 2.

5 is an amplifier, and 6 is a measuring device, which are connected in series from the brush 3B of the stator 3 via a lead wire 7.

The apparatus configured as described above performs measurement as follows. First, the female thread 2A of the rotor 2 is screwed into the male thread 1A coaxially formed on the end surface of the rotating shaft 1 to be measured. Next, the base 3A is fixed to the stationary part F at an appropriate position, and the brush 3B and the ring 2C are brought into contact with each other. Therefore, the accelerometer 4 is
Output line 4A, ring 2C, brush 3B, and
The lead wire 7 is electrically connected to the measuring instrument 6 via the amplifier 5.

Now, when the rotating shaft 1 rotates and longitudinal vibration occurs,
The rotor 2 screwed onto the shaft end surface also rotates, and
Produces longitudinal vibration. The accelerometer 4 is embedded in the axial center of the rotor 2 and positioned to detect acceleration in the axial direction, so it directly measures and outputs the longitudinal vibration of the rotating shaft 1. This output is displayed or recorded by the measuring device 6 via the electrical system path described above.

In this way, in the apparatus of this embodiment, since vibration can be directly detected by the accelerometer 4 attached to the rotating shaft 1, absolute longitudinal vibration can be measured.

In addition, an accelerometer 4 is embedded in the rotor 2 of the slip ring, which is commonly used, and this rotor 2
Since it has a structure in which it is attached to the rotating shaft 1, it becomes extremely easy to attach and detach the device.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a conventional device, and FIG. 2 is a diagram of a device showing an embodiment of the present invention. 1: Rotating shaft, 2: Rotor, 3: Stator, 4:
Accelerometer, 6: Measuring instrument.

Claims (1)

[Scope of utility model registration request] A rotor of a slip ring is attached almost coaxially near the end of the rotating shaft, a stator of a slip ring is fixed to a stationary part facing the rotor, and the acceleration in the axial direction is detected at a position near the axis of the rotor. A longitudinal vibration measuring device for a rotating shaft, comprising a fixed accelerometer and a measuring device that receives the output of the accelerometer taken out through the slip ring.