JP4461648B2 - Belt strain measurement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt strain measuring device, and more specifically, a strain sensor attached to a belt mounted on a pulley, and a signal connected from the strain sensor connected to the strain sensor by a wire to input a signal from the strain sensor. The present invention also relates to a belt strain measuring apparatus having a strain measuring instrument for measuring the strain state of the belt.
[0002]
[Prior art]
Conventionally, this type of belt strain measurement device has a strain cage attached to a pair of pulleys and a dynamic strain that measures the strain state by inputting a signal from the strain cage while the belt is rotating. Proposals have been made to perform signal transmission with a meter by wire (lead wire). In this belt strain measuring device, the lead wire from the strain gauge is relayed through a slip ring provided in parallel with the belt rotation to the dynamic strain meter in order to reduce the twist of the lead wire accompanying the belt rotation. Trying to connect.
[0003]
[Problems to be solved by the invention]
However, in such a belt strain measuring device, since a large centrifugal force acts on the lead wire connecting the slip ring and the strain gauge as the belt rotates, the lead wire may be broken. This is a particular problem when distortion is inspected while the belt is rotated at a high rotational speed.
[0004]
In order to solve such a problem, it is conceivable to connect the strain gauge and the dynamic strain gauge by radio. However, when wireless is used, it is necessary to incorporate a transmitter and a battery for transmitting signals to the dynamic strain gauge in the strain gauge, so that it is difficult to incorporate it and the weight of the strain gauge increases. As a result, a large centrifugal force acts on the belt itself, which may cause a large error in the measured stress value. Moreover, since wireless is used, an error may occur in the measured stress value due to the influence of noise.
[0005]
One object of the belt strain measuring apparatus of the present invention is to provide a more reliable apparatus. Another object of the belt strain measuring apparatus of the present invention is to reduce the stress acting on the lead wire between the strain sensor and the strain measuring instrument.
[0006]
[Means for solving the problems and their functions and effects]
The belt strain measuring apparatus of the present invention employs the following means in order to achieve at least a part of the above-described object.
[0007]
The belt strain measuring device of the present invention is
A strain sensor attached to a belt spanned on a pulley, and a strain measuring instrument connected to the strain sensor by a wire and measuring a strain state of the belt by inputting a signal from the strain sensor while the belt rotates. A belt strain measuring device having
It has a connection point which is connected through a lead wire to said strain sensor, a movable member for moving the connection point to follow the strained sensor is disposed in parallel to the belt, from the center of rotation A mover that is a rotating body having the connection point at a position that is a predetermined distance away and that corresponds to the position of the strain sensor;
Belt rotation detecting means for detecting the rotation state of the belt;
A rotating body rotation detecting means for detecting a rotating state of the rotating body;
Based on the rotation state of the belt detected by the belt rotation detection means and the rotation state of the rotation body detected by the rotation body rotation detection means, the rotation of the rotation body to rotate in synchronization with the rotation of the belt. And a rotating body rotation control means for controlling the rotation .
[0008]
A strain measuring device for a belt of the present invention, the movable element having a connection point which is connected through a lead wire to strain sensor, since to move the connection point in accordance with the rotation of the strain seen sensor, a strain sensor Excessive stress does not act on the connected lead wires. As a result, kinking or breakage of the lead wire can be reduced, and a more reliable device can be obtained.
[0009]
In strain measuring device for a belt of this invention, prior Machinery rotary body can also be composed is formed in a disc shape. If it carries out like this, rotation of the connection point connected via the lead wire with respect to the distortion sensor can be made smooth.
[0011]
Furthermore, the belt strain measuring apparatus of the present invention may further include a relay unit that is slidably contacted with the electrode formed on the movable element and relays signal transmission from the strain sensor to the strain measuring instrument. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a configuration diagram showing an outline of the configuration of an apparatus including a belt strain measuring apparatus according to an embodiment of the present invention. As shown in the drawing, the belt strain measuring device of the embodiment includes a strain gauge 24 attached to a belt 22 (for example, a belt used in a belt-type continuously variable transmission) spanned on pulleys 10 and 12, and A dynamic strain meter 28 connected to the strain gauge 24 via lead wires 26 and 27 to input a signal from the strain gauge 24 during rotation of the belt 22 and measure strain (stress) generated in the belt 22; A disk-shaped rotating body 30 that has a connection point 32 for connecting the lead wire 26 from the lead wire 26 and rotates the connection point 32 by driving a motor 38 following the rotation of the strain gauge 24, and the rotation of the rotating body 30 is controlled. and a rotation control device 5 0 to. The rotating shaft of the pulley 10 is connected to the rotating shaft of a motor (not shown) provided in the motor unit 11, and the rotating shaft of the pulley 12 is rotatably supported by the bearing unit 13. That is, the rotation control of the belt 22 which is hung on a pair of pulleys 10 and 12 is performed by the rotation control of the motor of the motor unit 11 by the rotation control device 5 0. The bearing unit 13 is slidable while being guided by the guide rails 14 and 15, and the slide position can be adjusted by the cylinder 16 attached to the bearing unit 13, that is, the distance between the pulleys 10 and 12 can be adjusted. It has become. Therefore, in the belt strain measuring apparatus of the embodiment, the tension acting on the belt 22 can be freely adjusted, and the strain state of the belt 22 can be measured in various situations.
[0013]
The rotating body 30 is installed in parallel with the belt 22 so that it can rotate in parallel with the rotation of the belt 22. The connection point 32 of the rotator 30 is formed by fixing the lead wire 26 with a pressure sensitive adhesive tape or an adhesive at a position corresponding to the position of the strain gauge 24 at a predetermined distance from the rotation center of the rotator 30. Yes. Here, the position of the connection point 32 is set so that the distance from the connection point 32 to the strain gauge 24 is as short as possible, that is, the length of the lead wire 26 between the connection point 32 and the strain gauge 24 is as much as possible. It is set so that it can be shortened. Therefore, the length of the lead wire 26 between the connection point 32 and the strain gauge 24 is such that the connection point 32 and the strain gauge 24 are generated as the belt 22 (strain gauge 24) and the rotating body 30 (connection point 32) rotate. It is sufficient that there is a play that can absorb the fluctuation of the distance between the two and the distance between them.
[0014]
FIG. 2 is a diagram illustrating signal lines from the strain gauge 24 to the dynamic strain gauge 28 of the belt strain measuring apparatus according to the embodiment. As shown in FIG. 2, an electrode 36 connected to the lead wire 26 is formed on the rotating shaft of the rotating body 30, and the lead wire connected to the strain gauge 24 via a slip ring 34 that is in sliding contact with the electrode 36. The signal transmission between the cable 26 and the lead wire 27 connected to the dynamic strain gauge 28 is relayed. Therefore, it can be avoided that the lead wires 26 and 27 are kinked when the rotating body 30 rotates.
[0015]
Although not shown, the rotation control device 50 is configured as a microprocessor centered on a CPU, and includes a ROM that stores a processing program, a RAM that temporarily stores data, and an input / output port. The rotation control device 50 includes the rotation speed N1 from the rotation speed sensor 39 (for example, an encoder or a resolver) that detects the rotation speed of the motor 38, that is, the rotation speed of the rotation body 30, and the rotation speed of the belt 22. The rotation speed N2 of the belt 22 from the belt rotation speed sensor 40 to be detected is input via the input port, and the rotation control device 50 outputs a drive signal to the motor 38 that rotates the rotating body 30 and the belt 22. A drive signal to the motor of the motor unit 11 to be rotated is output through the output port. Various belt rotational speeds detected by the belt rotational speed sensor 40 are detected by receiving the reflected light from the marker 42 attached to the belt 22 by the light receiving element of the belt rotational speed sensor 40. Yes.
[0016]
The operation of the belt strain measuring apparatus constructed as described above, particularly the operation when measuring the strain (stress) acting on the belt 22 during the rotation of the belt 22 accompanying the rotation of the pulleys 10 and 12 will be described. The rotation control device 50 controls the rotation of the belt 22 so that the rotation speed is a distortion (stress) measurement target by driving and controlling the motor of the motor unit 11. At the same time, the motor 38 is driven and controlled so that the rotating body 30 (connection point 32) rotates synchronously following the rotation of the belt 22, that is, the rotation of the strain gauge 24. As a result, the strain gauge 24 and the connection point 32 of the rotating body 30 rotate synchronously while maintaining a distance relationship within a certain range. At this time, since the length of the lead wire 26 between the strain gauge 24 and the connection point 32 of the rotating body 30 can be made relatively short, the strain gauge 24 acts on the lead wire 26 by centrifugal force as it rotates. The stress applied is relatively small. The rotation control of the rotator 30 is performed by comparing the rotation speed N1 of the rotator 30 detected by the rotator rotation speed sensor 39 with the rotation speed N2 of the belt 22 detected by the belt rotation speed sensor 40, so that a deviation ΔN ( N2-N1) is performed by driving and controlling the motor 38 in the direction to cancel. Here, instead of calculating the rotation speed of the belt 22 from the rotation speed of the motor of the motor unit 11, the rotation speed of the belt 22 is directly detected because of slipping of the belt 22 accompanying rotation of the pulley 10, This is because the rotation of the motor and the rotation of the belt 22 are not necessarily in a linear relationship due to the extension. In this way, when the belt 22 is rotated to the rotational speed to be measured, a signal from the strain gauge 24 is input to the dynamic strain gauge 28 via the lead wire 26, the slip ring 34, and the lead wire 27, and the strain (stress) is measured. The state is measured.
[0017]
According to the belt strain measuring apparatus of the embodiment described above, the connection point 32 connecting the lead wire 26 from the strain gauge 24 rotates synchronously following the rotation of the strain gauge 24 affixed to the belt 22. Since the rotating body 30 is rotated as described above, the stress acting on the lead wire 26 based on the centrifugal force can be further reduced, and the occurrence of kinking or breakage of the lead wire 26 can be reduced. As a result, a highly reliable strain measuring device can be obtained. Moreover, since the rotation number of the belt 22 and the rotation number of the rotating body 30 are detected and the rotation of the rotating body 30 is controlled in a direction to cancel the deviation, the rotation of the rotating body 30 can be more accurately followed by the rotation of the belt 22. Can be made more reliable.
[0018]
In the belt strain measuring apparatus of the embodiment, a disc-shaped rotating body 30 is used, but the connection point for connecting the lead wire from the strain gauge can be moved following the rotation of the strain gauge. As long as it is a thing, the shape of a rotary body may be what kind of thing, and a thing other than a rotary body, for example, a connection point may reciprocate in the bridging direction of a belt, etc. may be sufficient.
[0019]
In the belt strain measuring apparatus of the embodiment, the connection point 32 of the rotating body 30 and the slip ring 34 are connected by the lead wire 26, but at least the connection point and the slip ring are electrically conductive. If formed by a member, there is no need to connect the connection point and the slip ring with a lead wire.
[0020]
Further, in the belt distortion measuring apparatus of the embodiment, the rotation speed of the belt 22 is directly detected by the belt rotation speed sensor 40, and the motor is driven in a direction to cancel the deviation between the rotation speed of the belt 22 and the rotation speed of the rotating body 30. 38 is driven to control the rotation of the rotating body 30, but if the slip between the pulley 10 and the belt 22 or the extension of the belt 22 is negligible, the pulley (motor unit motor) The rotational speed may be detected, and the rotational speed of the belt may be calculated based on the detection result.
[0021]
The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention. Of course you get.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an outline of a configuration of an apparatus including a belt strain measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing signal lines from a strain gauge 24 to a dynamic strain meter 28 of the belt strain measuring apparatus according to the embodiment.
[Explanation of symbols]
10, 12 Pulley, 11 Motor unit, 13 Bearing unit, 14, 15 Guide rail, 16 Cylinder, 22 Belt, 24 Strain gauge, 26, 27 Lead wire, 28 Dynamic strain meter, 30 Rotating body, 32 Connection point, 34 Slip Ring, 36 electrodes, 38 motor, 39 rotating body rotation speed sensor, 40 belt rotation speed sensor, 42 marker, 50 rotation control device.

Claims (3)

A strain sensor attached to a belt spanned on a pulley, and a strain measuring instrument connected to the strain sensor by a wire and measuring a strain state of the belt by inputting a signal from the strain sensor while the belt rotates. A belt strain measuring device having
It has a connection point which is connected through a lead wire to said strain sensor, a movable member for moving the connection point to follow the strained sensor is disposed in parallel to the belt, from the center of rotation A mover that is a rotating body having the connection point at a position that is a predetermined distance away and that corresponds to the position of the strain sensor;
Belt rotation detecting means for detecting the rotation state of the belt;
A rotating body rotation detecting means for detecting a rotating state of the rotating body;
Based on the rotation state of the belt detected by the belt rotation detection means and the rotation state of the rotation body detected by the rotation body rotation detection means, the rotation of the rotation body to rotate in synchronization with the rotation of the belt. A belt distortion measuring device comprising: a rotating body rotation control means for controlling the rotation . The belt strain measuring device according to claim 1,
The rotating body, the strain measuring device for a belt ing is formed in a disc shape. The belt strain measuring device according to claim 1 or 2,
Relay means that relays signal transmission from the strain sensor to the strain measuring instrument in sliding contact with the electrode formed on the mover
Distortion measurement device of Ru with a belt.

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