JPH07101172B2 - measuring device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a device for measuring the inner diameter and the like of tubular objects.

[Prior art]

Conventionally, a device using a contactor is known as a device for measuring the inner diameter of a tubular measurement object. The apparatus has a cylindrical measuring head, and is provided with a contactor that movably projects from a window formed in the measuring head and abuts against a pipe wall of a measurement object.
The distance between the movable levers supporting the contacts is converted into an electric signal to display the measured value on the display unit. In such a measuring device, the position of the contactor with respect to the movable lever can be adjusted, and the measurable range of the inner diameter is widened. Therefore, such a device cannot measure absolute dimensions. Therefore, a so-called mastering process of setting the measurement origin of this device is required. That is, a master whose inner diameter is measured in advance is measured with this device, and the display value is calibrated so that the display value at that time is the true dimension of the master, and the measurement origin of the device is set to a predetermined reference value. Must be set. At this time, in order to increase the measurement accuracy, it is necessary to adjust the position of the contact with respect to the movable lever so that the measurement origin is located near the mechanical zero point which is the center point of the linearity. Further, since the display device is premised on the display at the time of measurement, it is arranged to display the value within the range where the linearity can be secured, and not display the value outside the range, and the display range is narrow.

[Problems to be Solved by the Invention]

However, when moving the contactor for mastering,
The measured value is 0 from the lowest value that the contact is free.
It changes greatly to the vicinity. Further, the step width of the change is large because the contactor is mechanically moved. For this reason, if it is displayed only within a narrow range as in the case of measurement, it is difficult to grasp how much the contactor should be moved to be positioned near the zero point, and it is difficult to adjust the movement of the contactor. . The present invention has been made to improve the above-mentioned problems, and an object thereof is to facilitate setting of a measurement origin during mastering.

[Means for solving problems]

The configuration of the invention for solving the above problems is as follows. That is, the present invention provides a pair of contacts, a pair of movable levers, an elastic member that urges and supports the movable levers, a displacement sensor that converts the relative displacement of the movable levers into an electric quantity, and an electrical displacement. Displacement detection circuit that outputs as a signal, control device that calculates the measured value, display device that displays the measured value, and the display device provided in the control device, as a deviation of the diameter of the measurement surface from the set reference value. The controller comprises a mode setting means for setting a measurement mode for measuring and displaying and an adjustment mode for displaying the absolute data output from the displacement detection circuit at the time of adjustment using the master measurement object. When the measurement value is set and the display value to be output to the display means is in the measurement range, the display value is displayed.When the display value is not in the measurement range, the display value is displayed. When the measurement mode display means (not shown) and the adjustment mode is set by the mode setting means, when the absolute data output from the displacement detection circuit exists in the measurement range, the absolute data is displayed by the measurement mode display means. When the unit is displayed and the absolute data does not exist within the specified range, the display of the minimum digit of the unit displayed by the measurement mode display means is set to zero, and 10 times the minimum digit is displayed as the step width. And means.

[Action]

The movable lever is deformed with the movement of the contact according to the size of the diameter of the measurement surface, and changes the interval thereof. The distance between the movable levers is converted into an electric quantity by the displacement sensor, and the changed electric quantity is output to the control device as an electric signal by the displacement detection circuit. The control device then displays the measured value on the display device after processing the signal. During mastering, the mode setting means is set to the adjustment mode. The contactor is brought into contact with the master, and its position is adjusted so that the display value becomes almost 0 so that the measurement origin is set near the mechanical zero point. When the adjustment mode display means of the control device is set to the adjustment mode and the absolute data is outside the predetermined range, the minimum digit 10
The double is displayed as the step width, and when the absolute data is within the predetermined range, it is controlled to display up to the unit displayed by the measurement mode display means. That is, since the display with coarse accuracy is performed until the measurement origin reaches a predetermined range including the mechanical zero point, the position of the mechanical zero point can be easily predicted. Further, when the value is within the predetermined range, the accuracy of the displayed value is high, so that the mechanical zero point is accurately positioned. Therefore, the position of the contactor for mastering can be adjusted easily and accurately. On the other hand, at the time of measurement, the mode setting means is set to the measurement mode. In the measurement mode, the deviation of the diameter of the measurement surface from the set reference value is displayed on the display means as a display value. When the measurement mode display means of the control device is set to the measurement mode and the display value is in the measurement range, the display value is displayed on the display means, and the display value is not in the measurement range. , The display value is not displayed on the display means. This results in a power saving in the measurement.

【Example】

The present invention will be described below based on specific examples. FIG. 1 is a partial cross-sectional view showing the structure of an inner diameter measuring device according to a specific embodiment of the present invention, and FIG. 2 is a block diagram showing the electrical structure of the device. In the figure, 1 is a measuring head, 3 is a gripping part, and 5 is a display head. The cylindrical side surface 10 of the measuring head is fitted onto the tubular measuring object 2. The cylindrical side surface 10 has a pair of windows on the diameter line.
11a, 11b are provided, and through the window, the contact 12
The a and 12b are provided so as to be movable in the X-axis direction. Contact
12a and 12b are movable levers 13a and 13b by screws 14a and 14b.
It is screwed to. The contacts 12a, 12b are adjusted by the screws 14a, b so that the contact surfaces 120a, b at the tips thereof project from the cylindrical side surface 10 and come into contact with the wall surface 2a of the measuring object 2. The movable levers 13a and 13b are supported by a support plate 15 which is one of elastic members, and the support plate 15 is fixed to a fixed block 31 projecting from a side wall 30 of the grip 3. The movable levers 13a and 13b are elastically connected by a coil spring 17, which is another elastic member. The measuring head 1 is fitted to the object to be measured 2, and the contact 12a,
When b comes into contact with the wall surface 2a of the object to be measured 2 and is pushed inward, the flexible portions 16a and 16b of the support plate 15 bend inward, the coil spring 17 contracts, and the contacts 12a and 12b are urged outward. To be done. Therefore, the contact surfaces 120a, 120b accurately abut the wall surface 2a of the object to be measured. A tube body 24 is fixed to the movable lever 13b, and a detection coil 21 is arranged inside the tube body 24. On the other hand, the movable lever 13a, the rod 23 is fixedly installed,
The core 22 is fixed to the tip of the rod 23. core
The relative position between 22 and the coil 21 changes in proportion to the distance between the movable lever positions 3a and 3b, and thus the distance between the contacts 12a and 12b. The displacement sensor 20 having such a configuration changes the inductance depending on the position of the core 22 with respect to the coil 21, and detects the change as an electric quantity. The measuring head 1 and the grip portion 3 are joined by flanges 18 and 32, and detachably joined by bolts 33. Coil 21
Are connected to the displacement detection circuit 40. As a mechanical attachment / detachment mechanism for the display head 5 and the grip portion 3,
A flange 36 formed integrally with the display head 5 and a fixing ring 37 which is rotatable with respect to the flange and has an internal thread is provided. The flange 36 abuts on the end of the side wall 30, and the fixing ring 37 is screwed with a screw formed on the side wall 30. The locking plate 59 is the locking plate 39 on the side of the grip 3.
By abutting on a and b, the display head 5 and the grip portion 3
Are aligned. The grip portion 3 and the display head 5 are electrically connected by the connectors 34 and 35.
Inside the grip portion 3, in addition to the displacement detection circuit 40, a battery 44,
A switching circuit 42 that controls power supply to the displacement detection circuit 40 by a control signal from the CPU 50 is provided. On the other hand, on the front surface of the display head 5, a display board 54 and an input switch 56 for setting an operation mode are provided. Then, inside the display head 5, a CPU 50 and a timing signal generation circuit 58 connected thereto, a ROM 55 storing a control program, a RAM 57 storing constants and the like, a stitch circuit 53 holding a display value, and a drive circuit 52 and a capacitor 51 charged from the battery 44 are provided. When the display head 5 is electrically connected to the grip portion 3, the display head 5
The device provided therein is powered by the battery 44, and when the display head 5 is electrically cut off from the grip portion 3,
It is powered by a charged capacitor 51. Therefore, even when the display head 5 is removed, the measured value can be continuously displayed on the display board. The CPU 50 receives the synchronization signal S1 as an interrupt signal from the timing signal generation circuit 58, operates intermittently each time the synchronization signal is input, and stops in the low power consumption mode during other free time. In FIG. 2, 34a to e and 35a to e are terminals of the connectors 34 and 35, respectively. The output signal of the timing signal generating circuit 58 is the connector terminals 35e, 34e, the short-circuit line 340, the terminals 34d, 35e.
Input to interrupt input pin NMI via d. By doing this, when the display head 5 is removed, the synchronization signal is not input to the CPU 50, so
It can be automatically stopped. The operation of this structure will be described with reference to the flowchart of FIG. (1) In the adjustment mode When the synchronizing signal is input, the execution is started from step 100, and the absolute data D is read from the displacement detection circuit 40.
Then, the setting state of the input switch 56 is detected, and when the adjustment mode is set, the routine proceeds to step 114, where it is judged whether the absolute data D exists within a predetermined range (step 114). Absolute data D is 10 μm when outside the specified range
A signal for displaying in units is output to the latch circuit 53.
As a result, data is displayed in units of 10 μm with the minimum digit of 0. Then, the process proceeds to step 112 and the CPU stops in the low power consumption mode. Step 10 every time a sync signal is input
Execution restarts from 0. The inner diameter of the master is measured, and the positions of the contacts 120a and 120b are repeatedly adjusted so that the displayed value approaches zero. Then, the absolute data D comes to exist within the predetermined range, and in that case, the data is displayed up to the minimum digit in units of 1 μm (step 118). Due to such processing, data is displayed in units of 10 μm until the predetermined range is reached, so that the position of the mechanical zero point can be easily registered. Further, when it is within the range, it is displayed with high accuracy, so that the mechanical zero point can be accurately detected. (2) In measurement mode When the input switch 56 is set to measurement mode, the step
At 104, the display value M is calculated from the absolute data D, the true inner diameter S of the master, and the display value DS of this device during mastering. Next, in step 106, the existence range of the value is determined,
When it exists in a predetermined range, the display value M is displayed in units of 1 μm, and when it is outside the predetermined range, it is not displayed. As described above, in the measurement mode, the measured value is not displayed when the accuracy is not guaranteed. The display head 5 of this device can be detached from the grip 3. When the display head 5 is removed, this device can be operated by electrically connecting the display head 5 and the grip portion 3 with a relay cable. In this case, the display head 5 can be erected regardless of the orientation of the measuring head 1. The present invention can be applied to the outer diameter measuring device. In the above embodiment, the control device is CPU50, ROM55, RAM5.
7, the latch circuit 53, the drive circuit 52, the timing signal generating circuit 58 is specifically configured, the display means is specifically configured by the display board 54, the mode setting means is specifically configured by the input switch 56, the measurement The function of the mode display means is step 100.
-110 and the function of the adjustment mode display means is specifically achieved in steps 100, 102, 114-118.

【The invention's effect】

The present invention, as described above, displays the display value in the widest possible range in the adjustment mode such as mastering,
When it is out of the specified range, it is roughly displayed with 10 times the minimum digit as the minimum unit.When it is in the specified range, it is displayed up to the minimum digit as in the measurement mode.
The inner diameter measuring device is configured to display the display value up to the minimum unit when the display value is within the predetermined range and not display the display value when the display value does not exist within the predetermined range. Therefore, it becomes easy to adjust the position of the contactor during mastering, and mastering can be performed quickly and accurately. In addition, at the time of measurement, the display is not displayed when the value is out of the range, so that power saving is achieved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the configuration of an inner diameter measuring apparatus according to a specific embodiment of the present invention, and FIG. 2 is a block diagram showing the electrical configuration of the apparatus. FIG. 3 is a flowchart showing the processing procedure of the control device used in the device of this embodiment. 1 ... Measuring head, 2 ... Measurement object, 3 ... Gripping portion 5 ... Display head, 10 ... Cylinder side 12a, b ... Contact, 13a, b ... Movable lever 15 ... Support plate, 21 ...... Detection coil 22 …… Core, 34,35, …… Connector 37 …… Fixing ring, 39a, b, 59 …… Locking plate

Continuation of the front page (56) Reference JP-A-51-103463 (JP, A) JP-A-57-22501 (JP, A) JP-A-56-31653 (JP, A) Actual development Sho-59-53218 (JP , U) Japanese Patent Publication Sho 32-1647 (JP, B1)

Claims (1)

[Claims] 1. A pair of contacts that abut on a cylindrical measurement surface of a measuring object, a pair of movable levers that screw the pair of contacts so as to move back and forth, and the movable member when fitted to the measuring object. An elastic member that urges and supports the lever in a direction in which the contactor comes into contact with the measurement object; a displacement sensor that is provided on the pair of movable levers and that converts a relative displacement of the movable levers into an electric quantity; A displacement detection circuit that is connected to the displacement sensor and outputs the relative displacement as an electric signal, a control device that inputs a signal from the displacement detection circuit, processes the signal, and calculates a measurement value, controlled by the control device A display device for displaying the measured value, a measurement mode for measuring and displaying the diameter of the measurement surface as a deviation from a set reference value, which is provided in the control device, and a master measurement object. Adjustment mode for displaying absolute data output from the displacement detection circuit during adjustment using, and mode setting means for setting, wherein the control device is set to the measurement mode by the mode setting means. In this case, when the display value to be output to the display means exists in the measurement range, the display value is displayed, and when the display value does not exist in the measurement range, the display value is not displayed. Means and, when the adjustment mode is set by the mode setting means, when the absolute data output from the displacement detection circuit exists in the measurement range, the absolute data is displayed by the measurement mode display means. Displayed in units, and when the absolute data does not exist within the predetermined range, the maximum of the units displayed by the measurement mode display means is displayed. The weighing value is set to zero, the measuring device characterized by having an adjustment mode display means for displaying the 10 times the least significant as step size.