JP5850064B2 - Vibration measuring apparatus and vibration measuring method - Google Patents

Description

The present invention relates to a vibration measuring apparatus and a vibration measuring method for measuring the vibration of a product accompanied by vibrations such as a motor, an engine, and an automatic transmission.

Products that emit vibrations, such as motors, engines, and automatic transmissions, are shipped after manufacturing and before the shipment, the vibrations generated by the products are measured with a vibration measuring device to confirm that the products are free of abnormalities.

Conventionally, a vibration measuring apparatus shown in FIG. 4 is known. This vibration measuring apparatus 101 includes a vibration sensor 102, a sensor holder 103 with the vibration sensor 102 attached to the tip, and the vibration sensor 102 via the sensor holder 103 as a measurement surface (hereinafter referred to as a measurement surface) of the object 104 to be measured. And an air cylinder 105 that contacts and separates from 104a.

As shown in FIG. 5, the vibration sensor 102 is housed in the sensor holding unit 106 below the sensor holder 103. An opening 107 is formed on the lower surface of the sensor holding portion 106, and a locking claw 108 is provided around the opening 107.

The vibration sensor 102 has a contact portion 102b having a slightly smaller diameter than the opening 107 on the lower surface of the sensor main body 102a, and an elastic body 109 such as urethane is bonded to the upper surface. The contact portion 102b slightly protrudes from the opening 107 of the sensor holding portion 106, and the stepped portion 110 between the sensor main body 102a and the contact portion 102b is held freely by the locking claw 108. A rod 112 urged by a compression spring 111 is accommodated in the sensor holder 103, and a head portion 113 at the lower end of the rod 112 is in elastic contact with the upper surface of the vibration sensor 102.

Japanese Patent Laid-Open No. 8-201159

By the way, in the conventional vibration measuring apparatus 101, the vibration sensor 102 is held freely by the locking claw 108 at the stepped portion 110 between the sensor main body 102a and the contact portion 102b, so that the lower surface of the contact portion 102b of the vibration sensor 102 is retained. Even if the sensing surface is not parallel to the measurement surface 104 a of the object 104 to be measured, the vibration sensor 102 is tilted when the vibration sensor 102 is pressed against the measurement surface 104 a, and the sensing surface of the vibration sensor 102 and the measurement surface 104 a of the object 104 to be measured are detected. However, there is a problem as described below.
(1) The restraining force by the compression spring 111 acts on the vibration sensor 102 and adversely affects vibration measurement.
(2) Since the vibration sensor 102 is moved up and down by the single air cylinder 105 and moved away from the measurement surface 104a of the object 104 to be measured, when there is a height difference in the measurement surface 104a, for example, an automatic transmission test When measuring vibrations of an automatic transmission having different height positions of the measurement surface 104a as the object 104 to be measured in the apparatus, it is difficult to bring the vibration sensor 102 into and out of contact with the measurement surface 104a having different heights.

The present invention solves the above-mentioned conventional problems, eliminates the restraining force due to a compression spring and the like, enables more accurate vibration measurement, and can easily cope with a case where there is a height difference on the measurement surface. The object is to provide a vibration measuring device.

According to the first aspect of the present invention, a vibration sensor, a sensor holder fitted with the vibration sensor to a tip portion and attached so as to be movable up and down, and the vibration sensor are brought into contact with and separated from the measurement surface of the object to be measured via the sensor holder. In a vibration measuring device comprising a sensor contact / separation mechanism,
The vibration sensor includes a measuring element plate provided with a flange-like protrusion and a vibration measuring element on the upper surface side, and includes a magnet on the lower surface side.
The sensor holder includes an opening for projecting a magnet at the lower end of the vibration sensor on a lower end side, and a protrusion engaging portion that engages with a lower surface of the flange-shaped protrusion of the fitted vibration sensor ,
The flange-shaped protrusion of the vibration sensor and the protrusion engaging portion of the sensor holder include a positioning pin and a pin fitting hole that fit together,
The positioning pin is released from contact with the lower end portion of the pin fitting hole at the time of vibration measurement, and after the vibration measurement is finished, when the sensor holder is lifted, the positioning pin comes into contact with the lower end portion of the pin fitting hole so that the vibration sensor is The lower end part is provided with the inclined surface located in the center part of a sensor holder, It is characterized by the above-mentioned.

According to a second aspect of the present invention, in the vibration measuring apparatus according to the first aspect, the sensor holder is divided into a plurality of parts, and upper ends thereof are connected by a connecting part.

According to a third aspect of the present invention, in the vibration measuring apparatus according to the first or second aspect , the sensor contacting / separating mechanism is configured to move the vibration sensor from a standby position to a first measurement position. And a second lifting / lowering air cylinder for moving the vibration sensor from the first measurement position to a second measurement position lower than the first measurement position.

According to a fourth aspect of the present invention, in the vibration measuring apparatus according to the third aspect , the second elevating operation air cylinder is the first elevating operation air cylinder, and the vibration sensor is set to the first measurement position. After the movement, the vibration sensor is moved to the second measuring position together with the first lifting operation air cylinder by the second lifting operation air cylinder.

According to a fifth aspect of the present invention, there is provided a vibration sensor, a sensor holder that is fitted to the tip portion so as to be movable up and down, and the vibration sensor is brought into contact with and separated from the measurement surface of the object to be measured via the sensor holder A sensor contact / separation mechanism,
The vibration sensor includes a measuring element plate provided with a flange-like protrusion and a vibration measuring element on the upper surface side, and includes a magnet on the lower surface side.
The sensor holder includes an opening for projecting a magnet at a lower end of the vibration sensor on a lower end side, and a protrusion engaging portion that engages with a lower surface of the flange-shaped protrusion of the vibration sensor, and a flange-shaped protrusion of the vibration sensor; The protrusion engaging portion of the sensor holder includes a positioning pin and a pin fitting hole that fit together,
The positioning pin is released from contact with the lower end portion of the pin fitting hole at the time of vibration measurement, and after the vibration measurement is finished, when the sensor holder is lifted, the positioning pin comes into contact with the lower end portion of the pin fitting hole so that the vibration sensor is A vibration measurement method for measuring the vibration of a measurement surface of an object to be measured using a vibration measurement device having an inclined surface positioned at the lower end of the sensor holder ,
The flange-shaped protrusion provided on the vibration sensor engages with the protrusion engaging portion provided on the sensor holder to prevent the vibration sensor from coming off the sensor holder, and the sensor holder is used to attach the sensor holder to the object to be measured. Move toward the measurement surface, first attach the magnet to the measurement surface and attach the vibration sensor to the measurement surface, then move the sensor holder to the measurement surface side with the sensor contact / separation mechanism and lower only the sensor holder. Thus, the vibration is measured by disengaging the flange-shaped protrusion provided on the vibration sensor and the protrusion engaging portion provided on the sensor holder.

(1) According to the invention of claim 1, the vibration sensor is accommodated in the sensor holder so as to be movable in the axial direction, and the flange-like protrusion provided on the vibration sensor is provided on the sensor holder. And the vibration sensor is prevented from falling off the sensor holder. When the sensor holder is moved toward the measurement surface of the object to be measured by the sensor contact / separation mechanism, the magnet is first attracted to the measurement surface and the vibration sensor is attached to the measurement surface. When the sensor holder is further moved to the measurement side by the sensor contact / separation mechanism, only the sensor holder is lowered, and the flange-like protrusion provided on the vibration sensor and the protrusion engaging portion provided on the sensor holder are not engaged (non-contact). Thus, the vibration sensor can measure vibration in a state where the restraint from the sensor holder is released.
Also, during vibration measurement, contact with the lower end of the pin fitting hole is released, and vibration measurement can be performed with the sensor holder being unconstrained. Since the inclined surface provided in the contact with the lower end portion of the pin fitting hole returns the vibration sensor to the center portion of the sensor holder, the positional deviation of the vibration sensor generated at the time of vibration measurement is corrected. Can be prepared for vibration measurement.

(2) According to the invention of claim 2, since the sensor holder is divided into a plurality of parts, the sensor holder divided on the outer periphery is arranged around the vibration sensor, and the upper ends of the divided sensor holders are arranged. By connecting at the connecting portion, the vibration sensor can be easily assembled into the sensor holder.

( 3 ) According to the invention of claim 3 , even if there is a difference in height on the measurement surface depending on the model of the object to be measured, it is possible to cope with it.

( 4 ) According to the invention of claim 4 , after the vibration sensor is moved to the first measurement position by the first lifting / lowering operation air cylinder, the second lifting / lowering operation air cylinder performs the first lifting / lowering operation. Since the vibration sensor is moved to the second measurement position together with the air cylinder for the cylinder, the stroke amount of the cylinder rod is compared with the case where the vibration sensor is moved to the second measurement position with a single lifting / lowering air cylinder. The vibration sensor can be moved to the second measurement position by using an air cylinder having a small amount.

( 5 ) According to the invention of claim 5 , since the vibration is measured by releasing the vibration sensor from the restraint of the sensor holder, the vibration can be measured more accurately.

The front view of a vibration measuring device. The side view of a vibration measuring device. 3A is a cross-sectional view of a vibration sensor and a sensor holder portion, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along the line CC of FIG. 3A. Explanatory drawing of the vibration measuring device of a prior art example. Sectional drawing of the vibration sensor and sensor holder part of the vibration measuring device of a prior art example.

Embodiments of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the vibration measuring apparatus 1 includes a vibration sensor 2, a sensor holder 3 having the vibration sensor 2 attached to the tip, and the vibration sensor 2 for measuring an object to be measured via the sensor holder 3. And a sensor contact / separation mechanism 4 that contacts and separates from the surface 104a.

As shown in FIG. 3A, the vibration sensor 2 includes a sensor main body 6 having a flange-like protrusion 5 on the top, and a plurality of vibration measuring elements 7 and connectors 8 attached to the upper surface side of the sensor main body 6. And a magnet 10 attached to the lower surface side of the sensor main body 6. Reference numeral 8 a denotes a harness connected to the connector 8.

The magnet 10 is attached in a state of being fitted into a recess provided on the lower surface of the sensor main body 6, and the lower end of the magnet 10 slightly protrudes from the lower surface of the sensor main body 6.

The flange-shaped protrusion 5 overlaps with a protrusion engaging portion 16 of the sensor holder 3 to be described later and prevents the sensor holder 3 from falling off. The flange-like projection 5 is formed with a pin fitting hole 11 into which a positioning pin 18 provided on the projection engaging portion 16 is inserted.

As described above, the sensor holder 3 supports the vibration sensor 2 so that the vibration sensor 2 can move up and down in a state where the flange-shaped protrusion 5 of the vibration sensor 2 is engaged to prevent the vibration sensor 2 from falling off. The holder main body portions 12 and 13 and a connecting portion 14 in which the upper ends of the pair of left and right holder main body portions 12 and 13 are screwed together are configured.

The pair of left and right holder main body portions 12 and 13 has a concave groove 15 on the inner peripheral surface, and a protrusion engaging portion 16 is formed below the concave groove 15 so that the flange-shaped protrusion 5 of the vibration sensor 2 overlaps. Yes. An opening 17 is formed between the protrusion engaging portions 16 of the pair of left and right holder main body portions 12 and 13 for projecting the lower end portion of the sensor main body portion 6 of the vibration sensor 2.

The protrusion engaging portion 16 is provided with a positioning pin 18 that fits into the pin fitting hole 11 provided in the flange-shaped protrusion 5 when the flange-shaped protrusion 5 of the vibration sensor 2 is overlapped. . In order to facilitate insertion into the pin fitting hole 11, the positioning pin 18 is formed to have a smaller diameter toward the tip, and a substantially conical inclined surface 18a is provided at the lower end. ing.

As shown in FIG. 3A, the inclined surface 18a is capable of measuring vibration in a state where the engagement with the lower end portion of the pin fitting hole 11 is released and the restraint from the sensor holder 3 is released during vibration measurement. become. Further, when the sensor holder 3 is raised after the vibration measurement is finished, the inclined surface 18a comes into contact with the lower end portion of the pin fitting hole 11, and the vibration sensor 2 is returned to the center portion of the sensor holder 3 to measure the vibration. It is possible to prepare for the next vibration measurement by correcting the positional deviation of the vibration sensor 2 that occurs at the time.

The vibration sensor 2 is assembled to the sensor holder 3 as follows, for example. First, the vibration sensor 2 is configured by attaching the measuring base plate 9 and the magnet 10 to the sensor body 6. Next, a positioning pin 18 is inserted into the pin fitting hole 11 provided in the flange-shaped protrusion 5 of the vibration sensor 2 from below the pin fitting hole 11, and a pair of left and right holders are placed at positions opposed to the vibration sensor 2. The main body parts 12 and 13 are assembled. Thereafter, the vibration sensor 2 is assembled to the sensor holder 3 by connecting the upper end sides of the pair of left and right holder main body portions 12 and 13 with the connecting portion 14.

Next, the sensor contact / separation mechanism 4 will be described. As shown in FIG. 2, the sensor contact / separation mechanism 4 includes a horizontal movement operation air cylinder 21 that moves the vibration sensor 2 directly above the measurement surface 104a of the object to be measured, and a standby right above the measurement surface 104a. The vibration sensor 2 located at a position (hereinafter referred to as standby height) is moved from the standby height to a first measurement position (hereinafter referred to as first measurement height A) or a second lower than the first measurement height. The first and second lifting and lowering operation air cylinders 22 and 23 (hereinafter referred to as the first lifting and lowering operation air cylinder 22 are referred to as X stroke cylinders, hereinafter) moved to the measurement position (hereinafter referred to as the second measurement height B). The second lifting / lowering air cylinder 23 is referred to as a Y stroke cylinder). The horizontal direction moving operation air cylinder 21, the X stroke cylinder 22, and the Y stroke cylinder 23 are provided with a speed controller.

As shown in FIG. 1, the horizontal moving air cylinder 21 is attached to a fixed surface 25 via a first bracket 24.

As shown in FIG. 2, the X stroke cylinder 22 is attached to the second bracket 26. The second bracket 26 is attached to the horizontal moving air cylinder 21 side via the rail portion 27, and is moved in the horizontal direction along the rail portion 27 by the horizontal moving air cylinder 21. The cylinder 23 is moved up and down.

The Y stroke cylinder 23 is attached to the third bracket 28. The third bracket 28 is attached to the lower end of the rod 22a of the X stroke cylinder 22 and follows the movement of the rod 22a.

A vertical moving plate 29 is attached to the lower portion of the rod 23a of the Y stroke cylinder 23, and the sensor holder 3 and the vibration sensor 2 are attached to the tip of the rod 23a below the rod 23a. A hydro speed controller (hereinafter referred to as a hydro speed controller) 30 is attached to the third bracket 28. Further, the vertical moving plate 29 is provided with a scoping dog 31 for operating the hydro-speakon 30.

As shown in FIG. 2, the stroke amount Y of the Y stroke cylinder 23 has a length corresponding to the distance from the standby position to the first measurement height A, and the stroke amount X of the X stroke cylinder 22 is The length corresponds to the distance from the first measurement height A to the second measurement height B.

Next, the operation of the vibration measuring device 1 will be described. Before the vibration measurement, the vibration sensor 2 is set at the standby position. When measuring vibration, first, the vibration sensor 2 is positioned directly above the measurement surface 104a by the horizontal moving air cylinder 21.

Next, when the measurement surface 104 a has the first measurement height A, the vibration sensor 2 is moved to the first measurement height A using the Y stroke cylinder 23.
In the process in which the vibration sensor 2 moves from the standby height to the first measurement height A, first, the magnet 10 is attracted and fixed to the measurement surface 104a of the object to be measured. Further, when the rod 23a of the Y stroke cylinder 23 is lowered, only the sensor holder 3 is lowered with respect to the vibration sensor 2 attracted and fixed to the measurement surface 104a of the object 104 to be measured by the magnet 10, and the vibration sensor 2 The flange-shaped protrusion 5 and the protrusion engaging portion 16 of the sensor holder 3 are brought into a non-contact state, and the substantially conical inclined surface 18a of the positioning pin 18 and the pin fitting hole 11 are brought into a non-contact state. The vibration can be measured in a state where the restraint from the sensor holder 3 is released.

When the measurement surface 104a is the second measurement height B, the vibration sensor 2 is further moved to the second measurement height B using the X stroke cylinder 22.

Also in this case, the vibration sensor 2 moves from the first measurement height A to the second measurement height B in the same manner as when the vibration sensor 2 is moved from the standby height to the first measurement height A. In the process, first, the magnet 10 is attracted and fixed to the measurement surface 104a of the object to be measured, and when the rod 22a of the X stroke cylinder 22 is further lowered, the magnet 10 is attracted and fixed to the measurement surface 104a of the object 104 to be measured. Only the sensor holder 3 is lowered with respect to the vibration sensor 2, and the flange-like protrusion 5 of the vibration sensor 2 and the protrusion engaging portion 16 of the sensor holder 3 are brought into a non-contact state. Vibration can be measured in a state where the constraint from 3 is released. When the sensor holder 3 is raised to the standby position after the vibration measurement is finished, the inclined surface 18a comes into contact with the lower end portion of the pin fitting hole 11, and the vibration sensor 2 is returned to the center portion of the sensor holder 3. The positional deviation of the vibration sensor 2 that occurs during vibration measurement is corrected to prepare for the next vibration measurement. In addition, although the case where the inclined surface 18a was provided in the lower end part of the positioning pin 18 was shown in the Example, you may acquire the effect similar to an Example by making the lower end part of the pin fitting hole 11 into an inclined surface. .

DESCRIPTION OF SYMBOLS 1 ... Vibration measuring device 2 ... Vibration sensor 3 ... Sensor holder 4 ... Sensor contact-and-separation device 5 ... Flange-shaped protrusion 6 ... Sensor main-body part 7 ... Vibration measuring element 8 ... Connector 8a ... Harness connected to the connector 9 ... Measuring element Plate 10 ... Magnet 11 ... Pin fitting hole 12, 13 ... A pair of holder main body parts 14 ... Connection part 15 ... Groove 16 ... Projection engagement part 17 ... Opening 18 ... Positioning pin 21 ... Air cylinder for horizontal movement operation 22 ... First air cylinder for lifting operation (X stroke air cylinder)
23 ... Second air cylinder for lifting operation (Y stroke air cylinder)

Claims (5)

A vibration sensor; a sensor holder that is fitted to the tip of the vibration sensor so as to be movable up and down; and a sensor contact / separation mechanism that causes the vibration sensor to contact and separate from the measurement surface of the object to be measured via the sensor holder. Prepared,
The vibration sensor includes a measuring element plate provided with a flange-like protrusion and a vibration measuring element on the upper surface side, and includes a magnet on the lower surface side.
The sensor holder includes an opening for projecting a magnet at the lower end of the vibration sensor on a lower end side, and a protrusion engaging portion that engages with a lower surface of the flange-shaped protrusion of the vibration sensor ,
The flange-shaped protrusion of the vibration sensor and the protrusion engaging portion of the sensor holder include a positioning pin and a pin fitting hole that fit together,
The positioning pin is released from contact with the lower end portion of the pin fitting hole at the time of vibration measurement, and after the vibration measurement is finished, when the sensor holder is lifted, the positioning pin comes into contact with the lower end portion of the pin fitting hole so that the vibration sensor is A vibration measuring device comprising an inclined surface positioned at the center of the sensor holder at the lower end .   The vibration measuring apparatus according to claim 1, wherein the sensor holder is divided into a plurality of parts, and upper ends thereof are connected by a connecting part. The sensor contacting / separating mechanism includes a first lifting / lowering operation air cylinder that moves the vibration sensor from a standby position to a first measurement position, and a second measurement that is lower than the first measurement position. vibration measuring apparatus according to claim 1 or 2, and a second lifting operating air cylinder for moving to the position, characterized in that it comprises a. The second elevating operation air cylinder moves the vibration sensor to the first measurement position with the first elevating operation air cylinder, and then moves the vibration sensor together with the first elevating operation air cylinder. The vibration measuring apparatus according to claim 3 , wherein the vibration measuring apparatus is moved to the second measurement position. A vibration sensor; a sensor holder that is fitted to the tip of the vibration sensor so as to be movable up and down; and a sensor contact / separation mechanism that causes the vibration sensor to contact and separate from the measurement surface of the object to be measured via the sensor holder. Prepared,
The vibration sensor includes a measuring element plate provided with a flange-like protrusion and a vibration measuring element on the upper surface side, and includes a magnet on the lower surface side.
The sensor holder includes an opening for projecting a magnet at the lower end of the vibration sensor on a lower end side, and a protrusion engaging portion that engages with a lower surface of the flange-shaped protrusion of the vibration sensor ,
The flange-shaped protrusion of the vibration sensor and the protrusion engaging portion of the sensor holder include a positioning pin and a pin fitting hole that fit together,
The positioning pin is released from contact with the lower end portion of the pin fitting hole at the time of vibration measurement, and after the vibration measurement is finished, when the sensor holder is lifted, the positioning pin comes into contact with the lower end portion of the pin fitting hole so that the vibration sensor is A vibration measurement method for measuring the vibration of a measurement surface of an object to be measured using a vibration measurement device having an inclined surface positioned at the lower end of the sensor holder ,
The flange-shaped protrusion provided on the vibration sensor engages with the protrusion engaging portion provided on the sensor holder to prevent the vibration sensor from coming off the sensor holder, and the sensor holder is used to attach the sensor holder to the object to be measured. Move toward the measurement surface, first attach the magnet to the measurement surface and attach the vibration sensor to the measurement surface, then move the sensor holder to the measurement surface side with the sensor contact / separation mechanism and lower only the sensor holder. A vibration measuring method comprising: measuring a vibration by disengaging a flange-like protrusion provided on the vibration sensor and a protrusion engaging portion provided on the sensor holder.

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