JPS643045Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration detection probe that detects vibrations of a rotating part of a mechanical device, and particularly to a vibration detection probe that is portable and uses a piezoelectric element as a detection sensor.

FIG. 1 is a front sectional view of a conventional vibration detection probe. The vibration detection probe is composed of a probe needle, a detection section, a holder section, and a cable. The probe needle 1 has a conical shape, a screw 2 is cut into the flange portion of the base thereof, and a base 3 is integrally fixed to the upper surface of the probe needle 1. A piezoelectric element in which two piezoelectric vibrators 4 and 4' are joined together via an electrode plate 10 is screwed between the load mass 9 and the inner bottom surface of the detection unit housing 5, and is further screwed into the detection unit housing 5. is screwed onto the base 3 with screws 6. The holder part 7 is screwed onto the flange portion of the probe needle 1 with screws 2 so as to cover the detection part housing 5 . When the tip of the probe 1 comes into contact with a vibrating object to be detected, the load mass 9 vibrates, and the voltage signal generated in the piezoelectric vibrators 4 and 4' is transmitted to the lead wire from the electrode plate 10 and the detection section. The cable 8 passes through the housing 5 and is guided to the main body of the measuring instrument (not shown).

The above-mentioned probe has the following drawbacks in vibration measurement. In other words, the shape is too large to hold by hand,
It was difficult to apply a pressing force to keep the probe 1 perpendicularly in contact with the object to be detected. Furthermore, although the measuring instrument body and the probe are connected by a cable 8 in a portable manner, the cable 8 is subjected to repeated bending motions at the insertion port into the holder portion 7 and is easily damaged. Furthermore, since the cable 8 is connected to a connector provided directly on the top surface of the detection unit housing 5, vibrations caused by bending the cable are directly transmitted to the piezoelectric vibrators 4, 4', causing noise.

The present invention eliminates the above-mentioned drawbacks, has a small shape that allows the probe needle to be held on the object to be detected with sufficient pressure, and is portable, so it does not cause damage or noise due to bending of the cable during handling. The object of the present invention is to provide a vibration detection probe with a structure similar to that of the present invention.

The vibration detection probe according to the present invention includes a probe needle that is integrated with a base having a circumferential groove on its outer periphery, a detection part in which a piezoelectric element is directly attached to the base with a tightening screw, and a flange portion at the base of the probe needle. a metal cylindrical cover screwed to the metal cylindrical cover; a holder part having a two-stage structure of the cylindrical cover screwed to the metal cylindrical cover and having a cable holding part having an inner diameter slightly larger than the outer diameter of the cable at the upper part; and the two cylindrical covers. and a cable connected to a connector connected to a metal connector holding plate held between the cable holding parts and fixed in a bellchuck manner in the cable holding part.

The present invention will be explained below with reference to the drawings. FIG. 2 is a front sectional view of an embodiment of the present invention. The probe needle 101, which has a screw 102 carved into the flange portion of its base, has an integral structure with a pedestal 103. A circumferential groove 113 is provided on the outer periphery of the pedestal 103. The detection section consisting of the piezoelectric vibrators 104, 104' and the load mass 105 is not incorporated into the housing as shown in FIG. 1, but is directly screwed onto the pedestal 103 with a tightening screw 106. The holder part is the probe needle 1
It has a two-stage structure including a metal cylindrical cover 111 screwed onto the flange portion of 01 with screws 102 and a cylindrical cover 112 screwed thereto. In the conventional example shown in FIG. 1, the casing was one transmission path for the voltage signal from the detection section, but in the structure of the present invention, there is a gap between the metal cylindrical cover 111 of the holder section and the two cylindrical covers 111 and 112. The metal connector holding plate 110, which is held under pressure by the metal connector holding plate 110, serves as a transmission path. That is, voltages with different polarities are generated in the piezoelectric vibrators 104 and 104', and are transmitted to the shield wire of the cable at the connector 109 via the pedestal 103, the metal cylindrical cover 111, and the connector holding plate 110. An electrode plate 107 that partitions the piezoelectric vibrators 104, 104' is connected to a core wire of a cable 108 by a connector 109 using a lead wire. Next, although the insertion port for the cable 108 was simply a through hole in the conventional example shown in FIG. 1, the present invention has a special holding mechanism. The cylindrical cover 112 that is screwed into the metal cylindrical cover 111 has a protruding cable holding part 115 having an inner diameter slightly larger than the outer diameter of the cable at the upper part, and a screw hole is provided in the cable holding part 115.
The cable whose outer periphery is covered with a cable protection plate 116 made of brass or the like is fixed with screws 117 in a bell chain manner.

In contrast to the conventional structure shown in FIG. 1, the above structure does not use a detecting part housing for housing the piezoelectric element, and the detecting part is directly screwed onto the base 103, resulting in an extremely compact structure. In the conventional example, the detection part casing was the transmission path for the voltage signal, but in the structure of the present invention, a part of the holder part is used as the signal transmission path. This miniaturization not only makes the probe easier to operate, but also eliminates contact resonance caused by contact between the detection unit housing and the pedestal. Since the measurement is performed using the longitudinal resonance defined by , highly reliable data can be obtained. Further, the base distortion observed as noise due to the influence on the piezoelectric element when the probe is held by hand is prevented from being transmitted by providing the circumferential groove 113 in the pedestal 103, so there is no problem. In addition, the cable is provided with a special cable holding part 115,
Therefore, since it is fixed in a belt-chuck manner, it is firmly held in two places with the connector 109 connected to the connector holding plate 110, and even if the cable is bent outside the probe, it will not cause damage or noise.

As explained above, the probe according to the present invention is
It is small and easy to hold by hand, and there is no noise during measurement, allowing stable measurement. It also has the advantage that there is no damage caused by bending the cable.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional vibration detection probe, and FIG. 2 is a front sectional view of one embodiment of the present invention. 101... probe needle, 102, 106... screw,
103... Pedestal, 104, 104'... Piezoelectric vibrator, 105... Load mass, 107... Electrode plate, 1
08...Cable, 109...Connector, 110
... Connector holding plate, 111 ... Metal cylindrical cover, 112 ... Cylindrical cover, 113 ... Circumferential groove, 1
14...Rubber cover, 115...Cable holding part, 116...Cable protection plate, 117...Screw.

Claims (1)

[Scope of utility model registration request] A probe needle is integrated with a pedestal with a circumferential groove on its outer periphery, a detection part in which a piezoelectric element is directly attached to the pedestal with a tightening screw, and a metal cylinder screwed onto the flange of the probe needle base. A holder part having a two-stage structure of a cover and a cylindrical cover screwed onto the metal cylindrical cover and having a cable holding part having an inner diameter slightly larger than the outer diameter of the cable at the upper part, and the two cylindrical covers. 1. A vibration detection probe comprising a cable connected to a connector connected to a metal connector holding plate and fixed in a bellchuck manner in the cable holding part.