JPS604921B2 - measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device configured to be able to measure hole diameters of various types of workpieces with one device.

Conventionally, the sensor used for length measurement is the Buddha kite (10-6
The measurable range is narrow in the case of a device that achieves the level of accuracy of a kite). For example, in the case of a differential transformer,
In general, it is 1000, and in special cases it is 2500, and for air micrometers, it is about 50. Therefore, it is necessary to install measurement systems for each type of workpiece to be measured, which leaves the problem that the equipment cost becomes high. The present invention solves the above-mentioned problem. A plurality of measuring heads having different precision measurable ranges and different outer diameters are attached to a support rod that moves up and down relative to the workpiece to be measured in the direction of the measuring head. The measuring head and the workpiece to be measured are sequentially compared to determine whether the hole diameter of the workpiece to be measured is within the precision measurement range of the measuring head, and the appropriate measuring head is determined. Precisely measure the hole diameter of the workpiece to be measured, which has a hole diameter larger than the outer diameter of the appropriate measuring head and within the precision measurement range of the appropriate measuring head. However, the present invention is characterized in that the hole diameter of a workpiece to be measured with multiple gutter can be precisely measured with one measuring device.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the measuring head 1 of the air micrometer,
1', 2, 2' are attached in multiple stages to support rods 3, 3' attached to the sub-plate 3, and the outer diameters of the measuring heads 1, 2 and 1', 2' are different from each other. They are different, and the precise measurable range differs depending on the hole diameter of the workpiece.

The subplate 3 is attached to the cylinder 4.
Air supply sensing pipes 5, 5', 6, 6' are connected to each of the measuring heads 1, 1', 2, 2', respectively. Each measuring head 1, 1', 2, 2' is opened by the action of a cylinder 4 in a hole 7a (first In the figure, the inner diameter measurement case 7a is illustrated). Furthermore, measuring head position detectors 10, 11,
12 are arranged corresponding to the installation intervals of the measuring heads 1, 1', 2, 2', while the sub-plate 3 is provided with a dock 13 that sequentially operates the measuring head position detectors 10, 11, 12. The dock 13 is configured to operate a measuring head position detector corresponding to a measuring head inserted into the hole 7a of the workpiece 7. FIG. 2 shows an electric circuit diagram for selecting a measurement head suitable for the workpiece 7 to be measured and measuring the workpiece 7.

To explain with a diagram, the output device of measurement head 2 (one is omitted) is connected to the measurement head selection circuit 14,
The output end of the measurement head selection circuit 14 is connected to a measurement range level determination circuit 16 via an increase circuit 15. The measurement range level determination circuit 16 determines whether the output signal Ei of the increaser circuit 15 is within the measurement range of the measurement head or not, and converts the output signal Ei of the increaser circuit 15 into a setting value set in advance by an oversize setting variable resistor 17 that exceeds the measurement range of the measurement head. The output terminal of the measurement range level discrimination circuit 16 outputs a result of comparison and discrimination (in this embodiment, an oversize discrimination method based on the measurement head is adopted). It is followed by a cylinder lowering command output circuit 18 to which a command signal is input, and is supported by a precision measurement output circuit 19 to which a measurement command is input. Measuring head position detector 11
, 12 are connected to the measurement head selection circuit 14, the level judgment command circuit 20, and the precision measurement output circuit 19, and the output bridge of the level judgment command circuit 20 is connected to the measurement range level judgment circuit 16. The operation of the measuring device according to the present invention configured as above will be explained.

The measuring heads 1 and 2 are lowered toward the hole 7a of the workpiece 7 as the cylinder 4 is actuated by a command from a separately provided control circuit, and the dock 13 detects the measuring head position detector 1.
0 and descends to a position where the measurement head position detector 11 is activated. In this state, the measuring head 2 is inserted into the hole 7a of the workpiece 7. When the measuring head position detector 11 is activated, a measuring head 2 selection instruction signal is input from the measuring head position detector 11 to the measuring head selection circuit 14, and a level judgment instruction signal is input to the level judgment command circuit 20. The selection signal of the measurement head 2 is also input to the precision measurement output circuit 19. The measurement head selection circuit 14 converts the measurement signal (air back pressure) of the measurement head 2 into an electrical signal and outputs it to the increase circuit 15 in response to the measurement head selection instruction signal. The level judgment command circuit 20' into which the level judgment instruction signal is input outputs a level judgment operation signal to the measurement range level judgment circuit 16 (in this case, it is operated by the signal from either of the measuring head position detectors 11 and 12). )
.

The measurement range level determination circuit 16 determines whether the diameter of the hole 7a of the workpiece 7 is within the measurement range of the measurement head 2 using the input signal Ei (DC voltage) from the increaser circuit 15 and the variable resistor 17. A comparison is made with a preset setting value Es.

If Ei<Es, the cylinder lowering command circuit 18
It outputs a "stop" signal and also outputs a "measurement command" signal to the precision measurement output circuit 19. In this state, the operation of the cylinder 4 is stopped, and on the other hand, signals are input to the precision measurement output circuit 19 from the measurement head position detector 11 and the measurement range level determination circuit 16.
is activated, and the measuring head 2 measures the inside of the hole 7a of the workpiece 7. In addition, in the case of Ei3Es, the measurement range level discrimination circuit 16 sends the cylinder lowering command circuit 18 "
Outputs a "down" signal. For this purpose, the cylinder 4 is actuated to insert the measuring head into the hole 7a of the workpiece 7. On the other hand, since the measurement range level determination circuit 16 outputs the "down" signal, the "measurement command" signal is not input to the precision measurement output circuit 19, and the precision measurement output circuit 19 becomes inactive. At this time, the dog 13 activates the measuring head position detector 12. When the input signal Ei of the increaser circuit 15 and the setting value Es of the measurement range level discrimination circuit 16 reach a relationship of Ei<Es, the precision measurement output circuit 19 is activated, and the measurement head 1 controls the workpiece 7. The inner diameter of the hole 7a is measured. In addition, in the embodiment, the measuring heads 1, 1'
, 2, 2' are the air sensors of the air micrometer.
Although we have explained the case where a
Any measuring head may be used as long as it can obtain a level of accuracy of .

Furthermore, although the case of internal measurement has been described, it can also be used for external measurement. Further, in this embodiment, the measuring heads are mounted in two stages, but the measurement head is not limited to this, and may be mounted in multiple stages. As described above, the present invention automatically selects a measuring head suitable for measuring a workpiece from among a plurality of measuring heads and measures the workpiece by using that measuring head, so that the measuring system can be unified. can be made into
Equipment costs are reduced, and since there is no need to determine the type of workpiece using a separate sensor to select a measurement system, it is possible to simplify the control system and facilitate automation.

In the present invention, a plurality of measurement heads having different precision measurable ranges are attached in the lateral direction of a support rod, the support rod is moved up and down in the vertical direction, and the measurement heads and the workpiece to be measured are contrasted. The system compares and determines whether the hole diameter is within the precision measurement range of the measuring head or not, operates the appropriate measuring head, and measures the diameter of the workpiece to be measured using the appropriate measuring head. Therefore, it is possible to accurately measure the hole diameter of a workpiece to be measured in a short time, which has a hole diameter larger than the outer diameter of an appropriate measuring head, and which is within the precision measurement range of an appropriate measuring head. be effective.

Furthermore, since the support rods only need to be moved up and down, the drive mechanism for the support rods is also simple.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a mechanical part of a measuring device according to the present invention;
FIG. 2 shows an electrical circuit diagram for selecting and measuring a measuring head used to measure a workpiece. 1, 1', 2, 2'...Measuring head, 3'...Supporting rod,
4...Cylinder, 7...Work, 7a
・・・・・・． - Holes, 10, 11, 12... Measuring head position detector, 14... Measuring head selection circuit, 15.
... Increase circuit, 16 ... Measurement range level discrimination circuit, 18 ... Cylinder lowering command output circuit, 19 ... Precision measurement output circuit, 20 ... ...
・Level judgment command circuit. Figure 1 Figure 2

Claims (1)

[Claims] 1. A plurality of measuring heads with different precision measurable ranges are mounted in multiple stages in the axial direction of a support rod that moves up and down relative to the workpiece to be measured, and a dog is provided on the mounting portion side of the support rod, and the A measuring head position detector, which is operated by engaging with the dog, is disposed on the side of the rod in correspondence with the measuring head, and each of the measuring head and the measuring head position detector is provided with a measuring head that operates by engaging with the dog. A signal is received from the measurement head position detector which engages and operates the dog in accordance with 1. A measuring device characterized in that a measuring circuit for selecting a measuring head and performing measurement is connected thereto.