JPH0617835B2 - Torque measuring device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to torque measurement of a rotating body that performs intermittent motion such as a step motor, measurement of minute torque of a pointer such as a timepiece / ammeter, and other torque of the rotating body. The present invention relates to a measuring device.

(Prior Art) Conventionally, torque measurement has been carried out by various devices.
As will be described later, in the contact type that connects the DUT and the measuring device,
Due to the influence of the moment of inertia of the detector, it is extremely difficult to measure the torque at startup, the torque fluctuating within a small rotation angle, and the minute torque.

Two examples will be given below as conventional examples.

1. Device by Hysteresis Brake System FIG. 5 is a conceptual diagram of a torque measuring device by a hysteresis brake system.

The rotating shaft 13 of the DUT 12 fixed to the measuring table 17 is
It is fixed to the disk 15 with a shot 14. Disk 15
Is rotated according to the rotation of the object to be measured 12, and when the electromagnet 16 is energized, a force corresponding to the current value is generated.

The DUT 12 is rotated to gradually increase the current value that is applied to the electromagnet 16, and the torque value of the DUT 12 is balanced with the braking force. However, in the case of this type of device, the inertial force of the detection parts such as the disk 15 and the joint 14 is relatively large, and the static measurement allows (a) a small torque and (b) fluctuations. It is not possible to measure the torque to be applied, (c) the torque at the time of starting, and (d) the torque at the time of reverse rotation of the rotating body including reverse rotation.

2. FIG. 6 is a conceptual diagram of a torque measuring device of the Pronie system, which is used for measuring the torque of a small motor, a timepiece or the like.

A pulley 18 is fixed to the rotating shaft 13 of the object to be measured, one end of the thread 20 is connected to the measuring stand 17, and the other end is a weight 1
Further, the yarn 20 is wound around the groove of the pulley 18 and hung.

The measurement is performed by rotating the object to be measured and rotating the pulley 18 in the clockwise direction to lift the weight 19. The judgment of lifting is made by slight bending of the yarn 21 on the measuring table side. The weight of the weight 19 is adjusted, and the maximum weight that can be lifted is multiplied by the radius of the pulley 18 to obtain the torque value. However, the yarn 20 intermittently slips in the groove of the pulley 18 by utilizing the difference between static friction and dynamic friction. As described above, the material and shape of the yarn 20, the winding on the pulley 18, and the like must be adjusted each time measurement is performed.

In the case of this type of device, it is influenced by the inertial force of the pulley 18 and the weight 19, is judged by the bending of the yarn 21 on the side of the measuring stand, and is alternately governed by static friction and dynamic friction, and a constant load cannot be applied. Therefore, (a) minute torque, (b) reverse rotation torque of the rotating body including reverse rotation, (c) fluctuating torque, and (d) starting and torque measurement cannot be performed. Further, since it is necessary to replace the weight 19 and adjust the yarn 20, (e) the measurement takes a long time.

As described above, the conventional torque measuring device has a region that cannot be measured. Moreover, it was difficult to apply it to the production site from the viewpoint of measurement time and cost.

(Object of the Invention) The present invention has the limitations of the conventional torque measuring device described above.
Focusing on the fact that most of them are due to the influence of the moment of inertia of the detector and the restraint of free rotational movement of the measured object, the torque of the rotating body that moves in a non-contact restraint state However, it is an object of the present invention to provide an apparatus for continuous, immediate and convenient measurement.

(Main Structure) The present invention provides a light source, a light receiving section facing the light source, a pointer fixed to a rotating shaft of an object to be measured arranged between the light receiving section and the light source, and the light receiving section. A detection unit of a large number of photoelectric elements arranged in a band at right angles to the rotation axis of the pointer, a line sensor camera that detects the position of the pointer by the detection unit and outputs the passing position as a continuous signal, and the pointer by the continuous signal Position and the time to reach that position, an opto-motion detector, a waveform storage device for storing the output of the opto-motion detector, and a passing position of the pointer from a pre-stored arithmetic program based on the waveform storage device data. And the angular velocity is converted by time, and an arithmetic circuit in which the moment of inertia of the object to be measured is stored in advance, and the arithmetic circuit calculates and processes the angular velocity and the moment of inertia. The torque diagram can be easily measured by immediately outputting the diagram of time and.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an example.

FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention, and FIG. 2 is a partial view of the apparatus.

The light beam 1 is arranged so as to face the photoelectric element array 11 included in the light receiving unit 10 of the line sensor camera 5. The clock 2 as an object to be measured has a second hand shaft 3 which is a rotating shaft and a second hand body 4 which is a pointer fixed to the second hand shaft 3, and when the second hand body 4 is interlocked, it is emitted from the light source 1 and the photoelectric element array 11 is provided. It is arranged at a position that blocks the light beam 6 received by. Reference numeral 7 is an opto-motion detector that receives the signal from the photoelectric element array 11 and outputs the position of the pointer and the time to reach the position.

Reference numeral 8 is a waveform storage device that stores the output of the opto-motion detector 7. 9 is a microcomputer.

For measurement, first, the timepiece 2 is driven. The second hand shaft 3 is rotated and the second hand body 4 is interlocked, so that the light beam 6 from the light source 1 is transmitted to the photoelectric element array 1
Prevent reaching 1. With this obstruction, the line sensor camera 5 continuously outputs the passing position of the second hand body 4 with respect to the photoelectric element array 11 as a signal.
, The position and the time to reach the position are combined, sent to the waveform storage device 8, and temporarily stored. The microcomputer 9 retrieves data from the waveform storage device 8, converts the position into an angle according to the stored and stored arithmetic program, and further differentiates twice with respect to time to convert into an angular acceleration. The microcomputer 9 separately stores in advance (the value of) the moment of inertia of the second hand body 4, the second hand shaft 3, and the gears (not shown) fixed to the second hand shaft 3 by a pre-stored subtraction program. , The angular acceleration and the moment of inertia are multiplied and the diagram of torque and time is immediately output.

FIG. 4 is a torque-time diagram obtained in this way, and FIG. 3 is an angle-time diagram.

Since the timepiece 2 of this embodiment is driven by the step motor, as shown in FIG. 3, the relationship between time and angle, that is, the rotation speed changes intricately within one step, and the reverse rotation is included. However, as is apparent from FIG. 3, the instantaneous torque change within one step is also captured. In addition, it is possible to measure very small torque of 1gfcm or less.

As seen in the examples, according to the torque measuring device of the present invention, not only the torque measurement but also the angle-time diagram of the rotating body,
Further, the angular velocity-time diagram can also be implemented by inputting a calculation program to the micro computer 9. FIG. 4 is obtained in this way.

Although the second hand body 4 is used as a pointer in the embodiment, it can be used as a pointer by attaching a plate-like object having a projection that blocks a light beam or having a slit that allows a light beam to pass therethrough.

Further, a plate-like object having a protrusion or a slit already fixed to the rotating object to be measured can also be used as a pointer.

The value of the moment of inertia used in the calculation is the sum of the moments of inertia of the object fixed to the rotation axis of the measured object.

(Effects of the Invention) The present invention provides a light source, a light receiving section facing the light source, a pointer fixed to a rotating shaft of an object to be measured arranged between the light receiving section and the light source, and the light receiving section. In addition, a detector of a large number of photoelectric elements arranged in a band at right angles to the rotation axis of the pointer, a line sensor camera that detects the position of the pointer by the detector and outputs the passing position as a continuous signal, and the continuous signal Opto-motion detector that combines the position of the pointer and the time to reach the position, a waveform storage device that stores the output of the opto-motion detector, and the passage of the pointer from a pre-stored calculation program based on the waveform storage device data. The angular velocity is converted according to the position and the time, and the operational circuit stores the moment of inertia of the object to be measured in advance, and the operational circuit calculates and processes the angular velocity and the moment of inertia. The following effects are obtained by the configuration in which the diagram of time and time is output immediately.

Since it is measured in a non-contact and non-restraint state, (a) a minute torque such as a clock or ammeter can be measured.

(B) It is possible to measure the torque of complicated movements such as intermittent rotation, reverse rotation, and startup.

Further, since the waveform storage device and the arithmetic circuit such as a microcomputer are used, (c) the torque value corresponding to the elapse of time can be continuously and instantly obtained.

Furthermore, since preparation and operation of measurement are easy, (d) measurement at the production site can be facilitated.

[Brief description of drawings]

FIG. 1 is a diagram of an apparatus showing an embodiment of the present invention. FIG. 2 is a partial view of an apparatus showing an embodiment of the present invention. FIG. 3 is an angle-time diagram obtained by measurement by the device of the present invention. FIG. 4 is a torque-time diagram obtained by measurement by the device of the present invention. FIG. 5 is a conceptual diagram of a hysteresis brake type torque measuring device, and FIG. 6 is a conceptual diagram of a Pronie type torque measuring device. 1 is a light source, 2 is a clock (measurement object), 3 is a second hand axis (rotating axis), 4 is a second hand body (pointer), 5 is a line sensor camera,
6 is a light beam, 7 is an opto-motion detector, 8 is a waveform storage device, 9 is a microcomputer, and 11 is a photoelectric element array.

Claims (1)

[Claims] 1. A light source, a light receiving portion facing the light source, a pointer fixed to a rotating shaft of an object to be measured arranged between the light receiving portion and the light source, and rotation of the pointer on the light receiving portion. Detecting portions of a large number of photoelectric elements arranged in a band at right angles to the axis, a line sensor camera that detects the position of the pointer by the detecting portion and outputs the passing position as a continuous signal, and the position of the pointer by the continuous signal. An opto-motion detector that combines the time to reach the position, a waveform storage device that stores the output of the opto-motion detector, and an operation program that is stored in advance based on the waveform storage device data, depending on the passing position and time of the pointer. An arithmetic circuit that converts the angular velocity and stores the moment of inertia of the object to be measured in advance, and the arithmetic circuit performs arithmetic processing on the angular velocity and the moment of inertia to obtain a diagram of torque and time. Torque measuring device, characterized in that the output time manner.