JPH0712913U - Touch roller type position detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To easily and easily calibrate the displacement of the touch roller that detects the moving position of the mobile machine. [Structure] When a potentiometer driven by a touch roller obtains a voltage signal corresponding to the position of the moving machine and the position and moving distance of the moving machine are obtained from the signal of this potentiometer, when the moving machine turns on a reference limit switch. The potentiometer position signal of (S1) is taken in (S2), the offset of the moving position of the mobile machine is corrected by this signal (3), and then the effective range of potentiometer position detection is determined (S4). It is determined whether or not at least a part of the range is out of the actual moving range of the mobile machine (S5), and when it is out of the range, it is displayed that there is an abnormality (S7).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a touch roller type position detector that detects a position and a moving distance of a mobile machine from a rotation amount of a touch roller.

[0002]

[Prior art]

 A mobile machine such as a bridge carriage of a manipulator system detects a position and a moving distance for its position control by a touch roller type position detector.

FIG. 2 shows a touch roller type position detector. The roller 2 provided on the mobile machine 1 makes rolling contact with the moving surface by the movement of the mobile machine 1. A potentiometer 4 is connected to the rotary shaft of the roller 2 via a gear mechanism 3, and the rotation of the roller 2 associated with the movement of the moving machine 1 is transmitted to the operating shaft of the potentiometer 4, and the potentiometer 4 is connected to the position of the moving machine 1. To obtain the voltage output corresponding to. The amount of change in the output corresponds to the moving distance of the mobile machine 1.

The output of the potentiometer 4 is converted into a digital amount by the analog input unit 5 and is taken in as a position detection signal by the computer 6 which serves as the position detection processing means of the mobile machine 1. Further, the computer 6 calculates the position and moves the distance. The calculated data is displayed on the moving distance display 8 or the like via the digital output unit 7.

The touch roller 2 may be provided on the ground side to make rolling contact with the mobile machine 1.

In the above configuration, the touch roller 2 may be displaced with respect to the moving surface. Therefore, a software limit function is provided for determining the reference point of the mobile machine 1 and updating the stored contents of the moving position based on this position information.

This function is provided with an operation protrusion 9 that indicates a reference point on the moving surface of the mobile machine 1, and a reference point detecting means provided with a limit switch 10 that is operated at the position of the protrusion 9 on the mobile machine 1. When 1 passes through the reference point, the operation signal of the limit switch 10 by the projection 9 is taken into the computer 6 through the digital input section 11, and the computer 6 corrects the offset of the moving position by the reference point signal. Adjust the display to the actual position and movement distance.

[0008]

[Problems to be solved by the device]

 Since the movement position is corrected by the reference point limit, when the displacement of the touch roller 2 occurs, it is not necessary to manually calibrate the position by manually rotating the touch roller 2 by the operator.

However, when the displacement of the touch roller 2 becomes large, the effective range of the potentiometer 4 deviates from the actual movement range, and the position detection becomes impossible.

For example, as shown in FIG. 3, while the actual movement range B of the moving machine 1 is set with respect to the effective range A of the potentiometer 4 and the movement is repeated, the potentiometer is accumulated due to the accumulated displacement of the touch roller 2. When the effective range A of 4 changes to A ', the position cannot be detected in the range of G outside the range, even if the mobile machine 1 attempts to move, and the position cannot be moved.

In order to eliminate the occurrence of the immobility, it is necessary for the operator to periodically calibrate the positional deviation, and depending on the degree of the positional deviation, unnecessary calibration may be required, or conversely, there may be a problem that a calibration delay occurs. there were.

[0012] Particularly, in the bridge carriage for nuclear power, since the touch roller 2 cannot be easily corrected because it is in a radiation hazardous area, it is important to be able to accurately predict the timing of calibration before the touch roller 2 becomes unmovable.

An object of the present invention is to provide a touch roller type position detector that surely and easily calibrates the positional deviation.

[0014]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a touch roller that rotates according to the movement of a mobile machine, and a potentiometer that obtains a voltage signal corresponding to the position of the mobile machine by rotating the operation shaft by the rotation of the touch roller. And a reference point detection means for obtaining a signal when the mobile machine passes a reference point, and a position and a movement distance of the mobile machine from the signal of the potentiometer, and a movement position of the mobile machine by the detection signal of the reference point detection means. In a touch roller type position detector equipped with position detection processing means for correcting the offset of, the effective range of position detection of the potentiometer is obtained when correcting the offset, and at least a part of this effective range is determined by the mobile machine. It is characterized in that it is provided with a notifying means for notifying the user when the vehicle is out of the actual movement range.

[0015]

[Action]

 Check whether or not the position detection cannot be performed when moving the mobile machine by checking whether it is within the effective range of the position detection of the potentiometer when the mobile machine reaches the reference point. Predict in advance and get the information.

[0016]

【Example】

 FIG. 1 is a flow chart showing an embodiment of the present invention. This figure shows the movement distance display processing by the computer 6 of FIG. In the movement of the mobile machine 1, when the mobile machine 1 reaches the reference point and the limit switch 10 is turned on (step S1), the position signal is fetched from the potentiometer 4 at this time (step S2). The stored offset value is corrected (step S3). The processing up to this point is the same as with the conventional software limit function.

Next, the effective range A ′ for position detection is obtained from the position signal of the potentiometer 4 (step S4), and the effective range A ′ and the actual moving range B of the mobile machine 1 are compared (step S4). S5).

When the actual movement range B is inside the effective range A ′ as a result of this comparison, the distance is displayed as it is (step S6), and when at least a part is outside the effective range A ′, the movement becomes impossible. There is a fear display indicating that there is an abnormality (step S7). At this time, the display of the display 8 is flickered or a specific numeral is displayed.

Therefore, an effective range for detecting the position of the potentiometer is determined when the offset is corrected, and when at least a part of this effective range is outside the actual moving range of the mobile machine, the notification is given by a display or the like.

As a result, when the effective range A of the potentiometer 4 changes to A ′ due to the accumulation of the positional deviation of the touch roller 2, the movement is performed after the offset correction (step S3) before the actual movement control of the machine 1 is performed. It is determined whether or not it is possible (step S5), and when there is a possibility that the position cannot be detected due to movement, an error is displayed and the operator can be informed of the necessity of the positional deviation calibration.

It should be noted that the comparison between the effective range A ′ and the actual movement range B becomes immovable by discriminating with a certain margin before the range B attempts to deviate from the range A ′. Abnormalities can be predicted in advance, and calibration can be performed according to the maintenance inspection schedule.

[0022]

[Effect of device]

 As described above, according to the present invention, in the touch roller type position detector, whether the position detection range of the potentiometer when the moving machine reaches the reference point is within the actual moving range of the moving machine or not. Since the check is made, it is possible to determine in advance whether or not the position cannot be detected when moving the mobile machine, and it is possible to make a reliable and easy determination of the time when calibration is required.

In particular, it is possible to predict the time when calibration is required, and it is applied to the position detection of the bridge carriage for nuclear power to facilitate the adjustment of the correction time.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a touch roller type position detector.

FIG. 3 is a diagram showing a mode of displacement.

[Explanation of symbols]

 1 ... Mobile machine 2 ... Touch roller 4 ... Potentiometer 6 ... Computer 8 ... Moving distance display

Claims (1)

[Scope of utility model registration request] 1. A touch roller that rotates according to the movement of a mobile machine, a potentiometer that obtains a voltage signal corresponding to the position of the mobile machine by rotationally driving an operating shaft by the rotation of the touch roller, and the mobile machine serves as a reference point. And a reference point detecting means for obtaining a signal when passing through the position detecting means for obtaining the position and the moving distance of the mobile machine from the signal of the potentiometer and for correcting the offset of the moving position of the mobile machine by the detection signal of the reference point detecting means. In a touch roller type position detector having a processing means, an effective range of position detection of the potentiometer is obtained at the time of correcting the offset, and at least part of this effective range is outside the actual moving range of the mobile machine. A touch roller type position detector comprising an informing means for informing that.