JPH023148Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention is for determining the quality of the meshing between the worm wheel and the worm gear (hereinafter referred to as "meshing") in a power meter. The present invention relates to a meshing inspection device.

[Technical problems that invention attempts to solve]

Conventionally, it has been impossible to inspect the degree of meshing in a watt-hour meter by bringing the eye close to the meshing position due to the structure of the watt-hour meter. For this reason, the degree of meshing has been tested by viewing it from a distance, but this method has the problem of large individual differences in test results and the inability to quantify the degree of meshing. .

The present invention was devised in view of the problems of the prior art as described above, and its purpose is to provide a watt-hour meter that is structurally impossible to inspect the degree of meshing by bringing the eye close to the meshing position. An object of the present invention is to provide a meshing inspection device capable of numerically detecting the degree of meshing of a power meter and determining its quality.

[Structure of the idea]

(Means for Solving the Problems) The meshing inspection device of the present invention is inserted into the mating portion of a watt-hour meter in a jig device in which the watt-hour meter is fixed on a jig base. A light emitting probe for illuminating with parallel light beams, a light receiving probe inserted into the engaging portion to receive the transmitted light of the engaging portion, and an imaging surface for forming an image of the transmitted light received by the light receiving probe. an imaging device that scans the transmitted light image formed on the imaging surface and converts it into an electrical signal; and based on the output signal of this imaging device, samples the scanning signal of the bright part of the transmitted light image. a counter circuit that counts the sampled scanning signal in a direction perpendicular to the operating direction; and a determination circuit that compares the output value of the counter circuit with a preset level to determine whether or not the meshing of the meshing portion is good or bad. It is configured as having the following.

(Function) In a jig device in which the watt-hour meter is fixed on the jig base, the engaging portion of the watt-hour meter is illuminated with a light projecting probe. The light transmitted through the meshing portion is received by a light receiving probe. The received transmitted light is imaged on the imaging surface of the imaging device, and the image of the formed transmitted light is scanned and converted into an electrical signal. The scanning signal of the bright portion of the transmitted light image is sampled in a counter circuit and counted in a direction perpendicular to the scanning direction. The output from the counter circuit is compared with a preset belt in a determination circuit to determine whether the mesh is good or bad.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a side view of the inspection device according to this embodiment;
FIG. 2 is a top view of the same. In the figure, reference numeral 1 denotes a power meter consisting of a worm wheel and a worm gear, and this power meter 1 is fixed on a jig base 2. The jig base 2 moves back and forth as shown by the arrows. For this purpose, a stopper 3 is provided. A pair of emitting and receiving cylindrical probes 5 and 6 are protruded from an optical system box 7 fixed to the housing so that the meshing position 4 of the worm wheel and worm gear is sandwiched between their tips. probe 5,
The inside of the optical system box 7 including the illumination lamp 8
and a first lens 9, a first aperture 10, and a second lens 1 located in the middle of the cylindrical light projecting probe 5.
1. An irradiation optical system consisting of a cylindrical probe 5 and a 90-degree reflection mirror 12 placed at the tip of the cylindrical probe 5; A light receiving optical system consisting of a degree reflecting mirror 13, a cylindrical probe 6, a third lens 14 located inside the cylindrical probe 6, a second aperture 15, and a fourth lens 17, and a television camera built in It is composed of an image pickup tube 18. Note that the television camera may be configured with another imaging device having an imaging surface.

FIG. 3 shows the optical path of the optical system box 7. The scattered light from the illumination lamp 8 is focused by a first lens 9, passed through a first diaphragm 10, and converted into a parallel beam by a second lens 11, and this parallel beam passes through the cylindrical light projecting probe 5. and the meshing position 4 by the reflecting mirror 12.
is projected parallel to. Then, the transmitted parallel light from the meshing position 4 is substantially converted into light by the reflecting mirror 13 located on the opposite side, condensed by the third lens 14, and transmitted to the fourth lens 17 via the second diaphragm 15. The image pickup tube 18 is
tied to the surface.

FIG. 4 is an enlarged view of the meshing position 4. A detection range A indicated by a dotted line is imaged on the surface of the image pickup tube 18 in a meshing state between the worm wheel 20 and the worm gear 22 fixed to the shaft 21.

FIG. 5 is a block diagram showing the configuration of the meshing inspection device. The meshing state is the optical system 30,
From the television camera 31, horizontal/vertical A/D converter 32, video process amplifier 35, video A/D converter 36, counter circuit 33, judgment circuit 38, operation panel 37, monitor television 34, etc. It is processed using a block diagram composed of That is, when the transmitted light from the optical system 30 is coupled to the surface of the image pickup tube 18 between the television camera 31, the brightness of the transmitted light is converted into an electrical signal, which is sent to the monitor television 34 as the output of the television camera 31. The images are monitored at a magnification of several tens of times.
It also outputs the horizontal and vertical synchronization signals being scanned from the television camera 31, and outputs the horizontal and vertical A/D signals.
The signal is inputted to a counter circuit 33 via a converter 32. Then, the counter circuit 33 creates horizontal and vertical master signals for calculating the meshing state. Furthermore, the image signal output of the television camera 31 is given to a video process amplifier 35 and a video A/D converter 36, and the bright portion signal of the transmitted light output from the video A/D converter 36 is sent to the counter. input to circuit 33; Counter circuit 3
3 samples the bright portion based on the horizontal and vertical mask signals and the bright portion signal of the transmitted light, and calculates the meshing state. This result is the operation panel 3
7, it is compared with a set level, and a determination circuit 38 determines whether the meshing state is good or bad.

FIG. 6 is a diagram showing the meshing state of the image pickup tube 8 surface and the scanning line 40, and FIG. 7 is a diagram showing the relationship between the count number and the depth in the meshing state.

Next, the operation will be explained with reference to FIGS. 1 to 7. A power meter 1 is fixed on a jig base 2 that moves back and forth, and two detection cylindrical probes 5 and 6 are arranged in parallel on one side and an optical system box 7; Since the meshing state of the worm wheel 20 and worm gear 22 located inside cannot be observed from the outside due to the structure, the cylindrical probes 5 and 6 are inserted from different angles. In order to detect the transmitted light at the meshing position 4, first, the scattered light from the illumination lamp 8 passes through the first lens 9, the first aperture 10, the second lens 11, and the reflection mirror 12 to the meshing position. Projected parallel to 4. The transmitted parallel light from the meshing position 4 passes through the reflection mirror 13, the third lens 14, the second aperture 15 and the fourth lens 1.
The light enters the image pickup tube 18 in the television camera 31 through the lens 7, and the meshing portion 4 is imaged on the image pickup tube 18.

The brightness and darkness of the transmitted light connected to the surface of the image pickup tube 18 is converted into an electrical signal by the television camera 31, and the television camera 31 outputs horizontal and vertical synchronization signals and image signals. is converted into a digital signal by the A/D converter 32 and provided to the counter circuit 32, whereby the counter circuit 32 creates horizontal and vertical master signals. Further, the image signal is sent to a process amplifier 35.
The signal is amplified by the A/D converter 36, converted into a digital signal, and the bright portion signal of the transmitted light is given to the counter circuit 33. Then, the counter circuit 33
Now, only for the above-mentioned mask signal range, as shown in FIG. 6, for the bright part signal of the transmitted light, AND processing is performed for a specified number of horizontal scanning lines 40 in the vertical direction at the basic clock frequency ₀ , and the AND processed signal is It is compared with upper and lower limit levels set on the operation panel 37. Here, the upper and lower limit levels are determined from the characteristic line in Fig. 7 by the counter output value n ₁ for the lower limit depth (that is, the lower limit engagement depth) d ₁ and the counter output value n ₂ for the upper limit depth d ₂ . - Set the lower limit level in advance on the operation panel 37.
The upper and lower limit levels are compared with the output value of the counter circuit 33, and based on the compared signals, the determination circuit 38 accurately determines whether the depth of engagement is good or bad.

In addition, in the above embodiment, the cylindrical probe 5
A transmitted light detection mechanism with a U-shaped optical path is adopted, but by changing the angle of the reflective mirror at the tip of the U-shaped cylindrical probe, it is possible to detect reflected light or detect reflected light as an "L" shape. Possible for locations that are structurally difficult to see through. In addition, the cylindrical probes 5 and 6
You can also use an image light guide instead. Furthermore, in the above embodiment, the jig base 2 is moved in the above direction to inspect the state of the meshing portion 4, but even if the meshing state is inspected by moving the optical system box 7 back and forth, the same accuracy as above can be obtained. It is possible to perform various inspections.

[Effect of idea]

According to the present invention, it is possible to mechanically and electrically quantify and inspect the meshing state of the meshing portions of the watt-hour meter, which cannot be inspected by looking closely due to the structure of the jig device.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the inspection device, Fig. 2 is a top view of the inspection device, Fig. 3 is a diagram showing the detection range of meshing, and Fig. 4 is an optical FIG. 5 is a block diagram showing the configuration of the detection device, FIG. 6 is an enlarged view of the meshing state, and FIG. 7 is a diagram showing the relationship between meshing degree and count output. DESCRIPTION OF SYMBOLS 1...Power meter, 2...Jig base, 4...Meshing position (meshing position), 5, 6...Probe, 18...Image tube, 30...Optical system, 31...
...Television camera (imaging device), 33...
Counter circuit, 37...operation panel, 38...judgment circuit.

Claims (1)

[Claims for Utility Model Registration] A light projecting probe that is inserted into a mating part of a watt-hour meter in a jig device in which a watt-hour meter is fixed on a jig base to illuminate the mating part with parallel light beams. a light-receiving probe that is inserted into the meshing portion and receives the transmitted light of the meshing portion; and an imaging surface that forms an image of the transmitted light received by the light-receiving probe, and the transmitted light that is imaged on the imaging surface. an imaging device that scans a light image and converts it into an electrical signal; and based on the output signal of the imaging device, samples a scanning signal of a bright portion of the transmitted light image, and converts the sampled scanning signal into the operating direction. A meshing inspection characterized by comprising a counter circuit that counts in a vertical direction, and a judgment circuit that compares the output value of this counter circuit with a preset level to determine whether or not the meshing of the meshing portion is good or bad. Device.