JPH0449528Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to an air-type measuring device for measuring the inner diameter, outer diameter, roundness, and cylindricity of an object to be measured.

<Prior Art> Air-type measuring devices utilize the fact that the back pressure of an air nozzle placed close to a surface to be measured changes depending on the gap between the nozzle and the surface to be measured. In a conventional measuring device using an air nozzle, when a plurality of workpieces having the same diameter and different heights are measured using one machine, a measuring head corresponding to the workpieces to be measured is provided. Therefore, it is necessary to change the setup of the measuring head when the workpiece to be measured is changed, which significantly reduces work efficiency. Furthermore, in an automatic line, if measurement is to be performed without changing setups, a dedicated station corresponding to each workpiece to be measured is required, which increases the cost and requires a large space.

<Purpose of the invention> The purpose of the invention is to make it possible to measure different types of objects with the same diameter and different heights using the same measuring head of the same measuring station, and to eliminate the need for manual setup changes of the measuring head. That's true.

<Configuration of the device> The characteristic configuration of the device is a measurement system that includes a plurality of air nozzles facing the inner or outer peripheral surface of the object to be measured, and a pressure detector that detects changes in the back pressure of each of the air nozzles. In the apparatus, the plurality of air nozzles include at least three sets of air nozzles arranged at least diametrically in the same plane perpendicular to the axis of the object to be measured and spaced apart in the axial direction; The set of air nozzles is a common nozzle that corresponds to a common measured position from one end for each of the different types of workpieces and communicates with the pressure detector, and the second set of air nozzles is a nozzle dedicated to the first workpiece among the different types of workpieces. The third set of air nozzles is a nozzle dedicated to a second work among different types of work, and communicates with the pressure detector, and the third set of air nozzles is a nozzle dedicated to a second work among different types of work, and communicates with the pressure detector, and the third set of air nozzles is a nozzle dedicated to a second work among different types of work and communicates with the pressure detector. A switching means is provided for selectively switching to enable the measurement signal of the first workpiece-dedicated nozzle or the second workpiece-dedicated nozzle.

<Examples> Examples of the present invention will be described below based on the drawings.
In FIG. 1, reference numeral 1 denotes a head support body, and a measuring head 2 having a reference end surface 2a is provided thereon. A shaft-like projection 3 is vertically projected from the center of the reference end surface 2a, and a plurality of first to third shafts are formed on the outer peripheral surface of the shaft-like projection 3.
The air nozzles 4, 5, and 6 are arranged in at least four phases as shown in FIGS. 3 and 4 in the same plane perpendicular to the axis of the axial protrusion 3, and these first to third air nozzles At least three sets are provided with each set of numbers 4, 5, and 6 spaced apart in the axial direction.

The set of first air nozzles 4 includes common nozzles A, B, C, and D that correspond to a common measured position from the reference end surface 2a for each of the first and second workpieces W1 and W2 of different types having different heights. , the second air nozzle 5 is a nozzle E dedicated to the first work among different types of work,
F, G, H, and the third air nozzle set 6 is a set of nozzles I, J, dedicated to the second workpiece among different types of workpieces.
K and L. 7 is the first to third air nozzles 4,
It is an air passage that communicates with groups 5 and 6, respectively, and
are the first and second workpieces W in contact with the reference end surface 2a
1, W2 end face nozzle.

In the first embodiment, the first air nozzle set 4 is in direct communication with the pressure detector 9, as shown in FIG.
1, is connected to the pressure detector 9 via SV2, and the third air nozzle 6 set is connected to the second electromagnetic on-off valve SV.
3. Connected to pressure detector 9 via SV4. The first and second electromagnetic on-off valves SV1 to SV4 are selectively switched by a discrimination signal from a discrimination device (not shown) that discriminates the types of the first and second workpieces W1 and W2. These first and second solenoid on-off valves SV1~
The SV4 constitutes a switching means that enables only one of the second and third air nozzles 5 and 6.

As shown in FIG. 8, the pressure detector 9 connects the air pressure from the pressure air source 10 to the air supply line, which is kept at a constant pressure by the pressure reducing valve 11, through a fixed throttle 12 to each of the first to
A nozzle air supply path 16 that supplies air toward the third air nozzles 4, 5, and 6, and the pressure of this nozzle air supply path 16,
In other words, the pressure sensor 13 detects the nozzle back pressure.
and an AD converter 14 that provides an output signal from the pressure sensor 13 to a data processing device 15.

Since the present invention has the above-mentioned structure, when the workpiece mounted on the inspection head 2 is determined to be the first workpiece W1, the first electromagnetic on-off valves SV1 and SV2
is switched, and nozzles A and B, C and D, E and F, and G and H of the first and second air nozzles 4 and 5 are communicated, respectively. As a result, changes in the back pressure of the pair of nozzles communicating with each other are guided to the pressure sensor 13 of the pressure detector 9 and measured.

Here, the diameter dimensions are measured at four locations by the nozzles AB and CD of the first air nozzle group 4 and the nozzles EF and GH of the second air nozzle group 5, and the diameter is The dimensions and minimum dimensions are determined. In addition, roundness is calculated by calculating the difference between the measured dimensions in the same plane among the measured dimensions at four locations, that is, the difference between the measured dimensions of nozzles AB and CD, and the difference between the measured dimensions of nozzles EF and GH. Ru. Furthermore, cylindricity (presence or absence of taper) is determined by the difference in the measured dimensions of nozzles AB and EF, which are in the same phase but have different axial positions,
It can be determined by calculating the difference between the measured dimensions of CD and GH. These calculation processes are performed by software within the data processing device 15.

Also, the workpiece mounted on the inspection head 2 is
When it is determined that the workpiece is the workpiece W2, the second electromagnetic on-off valves SV3 and SV4 are switched, and measurement is performed using the first and third air nozzles 4 and 6 in the same manner as described above.

<Other Modifications> In the above embodiment, the air supply path 16 is switched by an electromagnetic on-off valve in order to enable either the second or third air nozzle 5 or 6. 16
It is also effective to leave the nozzles in a communicating state and to switch which of the measurement signals output from the pressure sensor 13 corresponding to each nozzle is enabled or disabled.

FIG. 9 shows a flowchart for switching the measurement signals using software within the data processing device 15. First, in step 21,
The workpiece mounted on the inspection head 2 is the first workpiece W.
1 or the second work W2 is determined,
If it is determined that it is the first work W1, the step
In step 22, the output signal of the pressure sensor 13 corresponding to the third air nozzle 6 is invalidated, and in step 23, the diameter dimension of the first workpiece W1 is determined by the output signal of the pressure sensor 13 corresponding to the first and second air nozzles 4 and 5. , roundness, and cylindricity are determined.

If it is determined in step 21 that it is the second work W2, the output signal of the pressure sensor 13 corresponding to the second air nozzle 5 is invalidated in step 24, and the output signal of the pressure sensor 13 corresponding to the first and third air nozzles 4 and 6 is invalidated in step 24. Based on the output signal of the pressure sensor 13, the diameter, roundness, and cylindricity of the second workpiece W1 are determined in step 23.

Note that the steps 22 and 24 described above constitute a switching means that enables only one of the second and third air nozzles 5 and 6. 1st nozzle 4
Based on the output signal of the pressure sensor 13 corresponding to the third nozzle 6, the diameter, roundness, and cylindricity are determined.

Note that the cylindrical protrusion of the shaft-shaped protrusion 3 is the first one.
- When the air nozzles of the set of third air nozzles 4, 5, and 6 are directed in the inner diameter direction, the outer diameter of the workpiece inserted into the cylindrical protrusion can be measured.

<Effects> As described above, according to the present invention, different types of objects to be measured with the same diameter and different heights can be measured using the same measurement head of the same measurement station by switching the electromagnetic on-off valve. There is no need to change the setup of the measurement head when changing the workpiece, or to use a dedicated measuring station for each workpiece to be measured, which has the advantage of improving measurement work efficiency, saving space, and significantly reducing costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a sectional view of the inspection head, Fig. 2 is an external view of its main parts,
Figure 3 is a sectional view taken along the line shown in Figure 2, Figure 4 is a sectional view taken along the line taken from Figure 2, Figure 5 is a measurement control circuit diagram, and Figures 6 and 7 show each nozzle position and the object to be measured. FIG. 8 is a configuration diagram of a pressure detector, and FIG. 9 is a flowchart of measurement signal switching as another modification. 1... Head support, 2... Testing head, 3...
...Axial protrusion, 4...First air nozzle, 5...Second air nozzle, 6...Third air nozzle, 7...Passage, 9...Pressure detector, 10...Pressure air source, 1
1... Pressure reducing valve, 12... Fixed throttle, 13... Pressure sensor, 14... AD converter, 15... Data processing device.

Claims (1)

[Scope of utility model registration request] A plurality of air nozzles facing the inner or outer circumferential surface of the object to be measured, a pressure detector that detects changes in back pressure of each air nozzle, and signal processing that processes each measurement signal output from the pressure detector. In the measuring device, the plurality of air nozzles include at least three sets of air nozzles arranged at least diametrically in the same plane perpendicular to the axis of the object to be measured, and spaced apart in the axial direction;
The first set of air nozzles is a shared nozzle that corresponds to a common measured position from one end for each of the different types of workpieces, and is in communication with the pressure detector, and the second set of air nozzles is used for each of the different types of workpieces. A set of air nozzles is a nozzle dedicated to the first workpiece and communicates with the pressure detector, and a third set of air nozzles is a nozzle dedicated to the second workpiece among different types of workpieces and communicates with the pressure detector. A measuring device comprising: a switching means for selectively switching to enable the measurement signal of the first workpiece-dedicated nozzle or the second workpiece-dedicated nozzle based on the determination signal.