JP2541093Y2 - Vibration and impact inspection machine for glass tube encapsulated thermistors - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration / impact inspection apparatus for a glass tube encapsulated thermistor for a vehicle-mounted sensor.

[0002]

2. Description of the Related Art There has been an inspection machine for applying only vibration to inspect the presence or absence of foreign matter in a conventional glass tube thermistor. In the inspection by this inspection machine, ten thermistors, which are parts to be inspected, are placed on a vibrating device, and the resistance value is measured for each thermistor for 30 seconds while applying vibration thereto, and the vibration is visually observed. Those with a change in the resistance value were selected as defective products.

[0003]

Conventionally, the presence or absence of foreign matter in a glass tube-filled thermistor has been inspected by applying only vibration to the thermistor and examining the change in the resistance value. Since the resistance value may not change even if it is a non-defective product, or a change in the resistance value may be overlooked at the time of a visual inspection, all of them may be selected as acceptable products. In addition, there is a disadvantage that the inspection requires a long time.

Therefore, an inspection machine which can be inspected in a short time and has a high reliability is required. However, it has been found that the vibration inspection alone is not sufficient, and the impact inspection must be performed at the same time.
As a test device for applying vibration and shock,
No. 242 discloses a structure of the jig. FIG. 5 is a perspective view of the vibration tester, and FIG. 6 is a perspective view of the impact tester. The vibration tester is for screwing the inspection object mounting plate 20 into a stop hole 24 of the table 5a fixed to the vibration generator 21 to apply vibration in the direction of the arrow. In addition, the impact tester is configured to screw the inspection object mounting plate 20 into a stop hole 24 of the table 5b which moves up and down by the vibration generator 22 and collides with the impact plate 23, and applies an impact in the direction of the arrow.

[0005] However, the vibration test and the impact tester are separate devices, so that it is necessary to sequentially perform the vibration and impact tests, and there is a problem that both tests cannot be performed at the same time. That is, it is necessary to change the inspection object mounting plate. Further, in the impact test, since the vibration generator 22 was used, the vibration width could not be adjusted to the extent that the impact force was changed, and the pitch of the impact could not be changed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a vibration / impact inspection apparatus for a glass tube-filled thermistor capable of simultaneously applying vibration and impact and accurately inspecting in a short time. .

[0007]

The present invention solves the above-mentioned problems and employs the following technical means. That is, an impact generator that is paired with a container accommodating one glass tube enclosing thermistor and applies an impact to the container, a vibration generator that applies vibration to a table on which a plurality of the containers and the impact generator are mounted, A glass comprising: an impact controller for giving a predetermined impact mode to the impact generator; and a tester group connected to each of the glass tube-filled thermistors for detecting a change in resistance of the thermistor due to impact or vibration. This is a vibration and impact inspection machine for tube-filled thermistors.

[0008]

Since the present invention is constructed as described above, it is possible to shorten the inspection time by simultaneously performing the vibration / impact inspection, and it is not necessary to employ a visual inspection means, so that the inspection accuracy can be improved. In addition, since it is possible to apply an impact in a predetermined impact mode by a program of the controller, it can be used for an object to be inspected other than the glass tube encapsulated thermistor.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory plan view of an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged view of a portion 〇 in FIG. 2. FIG. 3 shows a pair of a container 2 accommodating one thermistor 1 and a cylinder (impact generator) 4 (once / second) for applying an impact to the container 2. It is held by a holder 3 made of a material (made of MC nylon). In this embodiment, the piston of the cylinder 4 collides directly with the container 2 by piercing the retainer 3. For this purpose, the tip of the piston is covered with an elastic material (nylon) 7 to reduce the impact. The piston of the cylinder 4 is operated by compressed air. The cylinder 4 can apply an impact in an arbitrary impact mode according to a program of the controller 15. That is, the shock mode can be changed by the program of the control unit, and the shock pressure and the shock pitch can be changed according to the inspection object.

[0010] As shown in FIGS. 1 and 2, ten pairs of the container 2 and the cylinder 4 are mounted on a table 5, and a vibration generator 8 is provided below the table 5. These are all mounted on a gantry 6. The vibration generator 8 has a maximum amplitude of 2.0 mm, but can be changed. Reference numeral 9 denotes an insertion hole of the thermistor. The lead wire 10 of each thermistor 1 (FIG. 3) is connected to the connector 11 and the connector 1
1 is a tester 14 capable of simultaneously inspecting 10 thermistors 1
It is connected to the.

FIG. 4 is a circuit diagram showing one system of the tester 14. As shown in FIG. The tester 14 has a resistance value of the thermistor R and V
_When the value becomes equal to or less than the value determined by _ref , the comparator 12
And the flip-flop (FF) is inverted. This causes the display (LED) 13 to light up, and the RES
This state is maintained until the ET signal is input. In order to use the inspection device of the present invention, first, ten thermistors are inserted into the insertion holes 9 of the thermistors of the holder 3, and a power switch (not shown) is turned on to turn on the cylinder (impact generator) 4. And the vibration generator 8 is operated. The operation time is automatically set, and if the resistance value changes even at the moment of operation, the indicator 13 of the defective product number of the tester 14 lights up, so that the defective product can be identified very easily.

A thermistor (G803) manufactured by the present applicant.
H3U-MBJ121H) is fixed to the inspection device of the present invention,
As a result of measuring the resistance value of the thermistor in each of the following impact modes, the results shown in Table 1 were obtained. That is, according to the present invention, the defective product detection rate could be 100%.

[0013]

[Table 1]

In the embodiment shown in Table 1, when a defective product is found, the indicator (LED) 13 is turned on. Inspection time was greatly reduced to 20% of the conventional one. In addition, the comparative example was performed only with the vibration inspection machine. In the present embodiment, the piston of the cylinder 4 is configured to pierce the container 2 directly by piercing the retainer 3. In this case, the elastic material (nylon) at the tip of the piston
7 is unnecessary.

[0015]

[Effect of the Invention] The vibration / shock inspection machine of the present invention greatly improves the inspection accuracy, and also has an effect of improving the efficiency of the inspection work and improving the productivity. Further, the present invention can be used for an inspection object other than the glass tube encapsulated thermistor.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged view of a portion 〇 in FIG. 2;

FIG. 4 is a circuit diagram of a tester that detects a change in the resistance value of the thermistor.

FIG. 5 is an explanatory perspective view of a conventional vibration tester.

FIG. 6 is an explanatory perspective view of a conventional impact test machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermistor 2 Container 3 Container retainer 4 Cylinder 5, 5a, 5b Table 6 Stand 7 Elastic material (nylon) 8 Vibration generator 9 Thermistor insertion hole 10 Lead wire 11 Connector 12 Comparator 13 Display 14 Tester 15 Controller 20 Cover Inspection object mounting plate 21 Vibration generator 22 Shock generator 23 Shock plate 24 Stop hole

Claims (1)

(57) [Scope of request for utility model registration] 1. An impact generator paired with a container accommodating one glass-tube-enclosed thermistor to apply an impact to the container,
A vibration generator for applying vibration to a table having a plurality of containers and impact generators mounted thereon, an impact controller for imparting a predetermined impact mode to the impact generator, and an impact controller connected to each of the glass tube-filled thermistors; A vibration / shock inspection machine for a glass tube-filled thermistor, comprising a tester group for detecting a change in the resistance value of the thermistor due to vibration.