CN211478152U

CN211478152U - Spark plug ceramic body electric insulation defect detection device

Info

Publication number: CN211478152U
Application number: CN201921325224.4U
Authority: CN
Inventors: 谭冬和
Original assignee: Zhuzhou Torch Sparkplug Co ltd
Current assignee: Weichai torch Technology Co.,Ltd.
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-09-11
Anticipated expiration: 2029-08-15

Abstract

A spark plug ceramic body electrical insulation defect detection device comprises a ball head core rod, a core rod insulation sleeve, a silica gel plugging sleeve, a grounding ring and an air pressure holding device; the ball head core rod is provided with a high-voltage access end and is inserted into the inner cavity of the ceramic body to be detected; the core bar insulating sleeve is wrapped on the outer wall of the ball head core bar; the grounding ring is sleeved on the outer wall of the ceramic body to be tested; the silica gel blocking sleeve is sleeved at the end part of the ceramic body to be detected, and the air pressure holding device is arranged on two sides of the silica gel blocking sleeve. The utility model discloses can effectively detect out the tiny insulation defect on the spark plug ceramic body, improve the reliability that detects, reduce the erroneous judgement by a wide margin, can be applied to the automatic detection process of production scene to save artifical retest and verification work, improve production efficiency.

Description

Spark plug ceramic body electric insulation defect detection device

Technical Field

The utility model relates to a spark plug production technical field, more specifically relates to a spark plug ceramic body electrical insulation defect detecting device.

Background

The spark plug is a discharge ignition device of a gasoline internal combustion engine, needs to work in a high-temperature and high-strength corrosive environment for a long time, needs to be capable of bearing an operating voltage of tens of thousands of volts, and is mainly used as a component, namely a ceramic body, which is a carrier of the performances, wherein insulation defects are root causes of ignition failure of the spark plug.

The production process of the spark plug ceramic body inevitably generates electric insulation defects, and how to quickly and effectively detect the defects on line is an important link in the production process; the ceramic body has various electric insulation defect forms, serious cracks, fine half cracks, impurities in materials and the like, wherein the essential point for detecting the fine cracks is that the detection voltage value needs to reach a certain amplitude requirement, and the defect characteristic cannot be shown when the detection voltage value is lower than the detection required voltage value.

The existing on-line detection method generally adopts a core rod with high voltage to penetrate into an inner hole of a ceramic body, the ceramic body is sleeved with a grounding ring, in the ceramic inner hole in the test process, high voltage current sent by the core rod turns over a small hole port along the inner wall of the hole and then discharges to the grounding ring along the outer wall of the small hole, and due to the limitation of short creepage distance, the test voltage hardly meets the requirement of a test voltage value, so that the tiny click through electricity defect of the ceramic body is difficult to detect.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a detection device that can detect the little breakdown electric defect of ceramic body.

The utility model discloses specific technical scheme as follows:

a spark plug ceramic body electrical insulation defect detection device comprises a core rod, a core rod insulation sleeve, a silica gel plugging sleeve, a grounding ring and an air pressure holding device; the core rod is provided with a high-voltage access end and is inserted into the inner cavity of the ceramic body to be detected; the core bar insulating sleeve is wrapped on the outer wall of the core bar; the grounding ring is sleeved on the outer wall of the ceramic body to be tested; the silica gel blocking sleeve is sleeved at the end part of the ceramic body to be detected, and the air pressure holding device is arranged on two sides of the silica gel blocking sleeve.

Furthermore, the air pressure holding device comprises a mounting plate provided with a compressed air inlet, an air chamber and a POM framework; the POM framework is arranged on the inner side of the mounting plate, and the air chamber is arranged on the POM framework.

Furthermore, the wrapping starting point of the core rod insulating sleeve is positioned at the high-voltage access end of the core rod, and the wrapping length does not exceed the length of the ball head core rod.

Further, the core rod is a ball head core rod.

Furthermore, an insulating support pad is sleeved outside the core rod insulating sleeve.

Furthermore, the top of the silica gel plug is also provided with a cover plate.

Further, the core rod is inserted from the small end of the ceramic body to be tested; the silica gel plug sleeve is sleeved at the big end of the ceramic body to be tested.

According to the technical scheme, the method for detecting the electric insulation defect of the ceramic body of the spark plug can be provided, and comprises the following steps: installing a silica gel plug at the large head end of the ceramic body to be tested for sealing; inserting a core rod into the small end of the ceramic body to be tested, wherein the core rod is provided with a high-voltage access end and can release high voltage electricity in the inner cavity of the ceramic body to be tested, and the core rod wraps a core rod insulating sleeve from the high-voltage access end; the outer wall of the ceramic body to be tested is connected with a grounding ring; and supplying power to the core rod, and observing whether the outer surface of the ceramic body to be measured generates electric arcs or not, or connecting the outer surface of the ceramic body to be measured with a voltage measuring circuit to measure the voltage of the ceramic body to be measured.

The utility model discloses set up core bar and silica gel plugging device with insulating cover respectively at ceramic body big-end and little head end, carry out the insulating seal to the ceramic body that awaits measuring, increased the creepage distance between core bar and the external ground ring to effectively maintain the voltage in the ceramic body that awaits measuring, make this voltage can reach the test requirement, be enough to detect the tiny point breakdown defect on the pottery; the utility model discloses can be applied to the automatic detection process of production site, improve the reliability that detects, reduce the erroneous judgement by a wide margin to practice thrift artifical retest and verification work, improve production efficiency.

Drawings

Fig. 1 is the utility model provides a flower stopper ceramic body electrical insulation defect detection device schematic structure.

FIG. 2 is a simple schematic diagram of a detection circuit of the automatic detection device for the electrical insulation defect of the ceramic body of the spark plug.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, the device for detecting the electrical insulation defect of the spark plug ceramic body comprises a core bar 13, a core bar insulating sleeve 9, a silica gel plug 2, a grounding ring 6 and an air pressure holding device; the core rod 13 is a ball head core rod 13, which is provided with a high-voltage access end 10 and is connected with an external high-voltage electric input device, the core rod 13 is inserted into the inner cavity of the ceramic body 7 to be tested from the small end part of the ceramic body 7 to be tested, the core rod insulating sleeve 9 is wrapped on the outer wall of the core rod 13, the wrapping starting point of the core rod insulating sleeve 9 is positioned at the high-voltage access end 10 of the core rod 13, the total length of the wrapping is not more than the length of the core rod 13, and the core rod insulating sleeve 9 completely fills a gap between the; the grounding ring 6 is sleeved on the outer wall of the middle part of the ceramic body 7 to be tested; the silica gel plug 2 is sleeved at the end part of the large end of the ceramic body 7 to be tested, the air pressure holding device is arranged at two sides of the silica gel plug 2 and comprises a mounting plate 4 provided with a compressed air inlet 11, an air chamber 12, a POM framework 3 and a silica gel sheath 5, wherein the POM framework 3 is arranged at the inner side of the mounting plate 4, and the air chamber 12 is arranged in the silica gel sheath 5 on the POM framework 3; the top of the silica gel plug 2 is also provided with a cover plate 1; and an insulating supporting pad 8 is arranged on the outer side of the core rod insulating sleeve 9 to support the ceramic body 7 to be tested.

The traditional device for detecting the insulation defect of the spark plug ceramic body only is provided with a core rod 13 with high voltage and a grounding ring sleeved on the outer wall of the ceramic body 7 to be detected, the core rod 13 releases high voltage in the inner cavity of the ceramic body 7 to be detected, if the ceramic body 7 to be detected has the insulation defect, the ceramic wall is broken down, and then current is released from a punching hole to generate electric arc, so that the ceramic body 7 to be detected can be judged to have the insulation defect; however, in the testing process, if the core rod 13 is too long or the ceramic body 7 to be tested is short, the creepage distance is short, the high-voltage current released by the core rod 13 is transmitted along the inner wall of the ceramic body 7 to be tested, turns over the port, and is transmitted to the grounding ring along the outer wall of the ceramic body 7 to be tested, so that the voltage of the high-voltage current released by the core rod 13 is greatly reduced, the requirement of the testing voltage value cannot be met, and the insulation defect that some of the ceramic to be tested can be broken down by the testing voltage cannot be detected.

And the utility model discloses in big head end, the little head end department at the ceramic body 7 that awaits measuring set up respectively and can carry out the insulating part sealed: the outer wall of the core rod 13 is wrapped by a core rod insulating sleeve 9, and a gap between the core rod 13 and the inner wall of the ceramic body 7 to be tested is sealed; a silica gel plug 2 is placed at the large end of the ceramic body 7 to be tested, air pressure holding devices are arranged on two sides of the silica gel plug 2 and comprise a mounting plate 4 with a compressed air inlet 11, an air chamber 12 and a POM framework 3, the POM framework 3 is arranged on the inner side of the mounting plate 4, the air chamber 12 is arranged on the POM framework 3, and when compressed air is filled, the air chamber 12 expands to push a silica gel sheath 5 to play a role in holding the silica gel plug 2 tightly; meanwhile, the cover plate 1 is arranged at the top of the silica gel plug 2, and the silica gel plug 2 and the air pressure holding device together accurately press the silica gel plug 2 at the outlet of the big end of the ceramic body 7 to be tested; the existence of the core rod insulating sleeve 9 and the silica gel plug 2 increases the creepage distance between the core rod 13 and the external grounding ring, so that the high-voltage current released by the core rod 13 can be effectively prevented from creeping out from two ends, the loss of the voltage of the inner cavity of the ceramic body 7 to be tested can be reduced, the output voltage of the ceramic body can reach the required value of the test voltage, if the voltage cannot puncture the ceramic body 7 to be tested, the ceramic body 7 to be tested is qualified, no insulation defect exists, otherwise, the detection piece needs to be rejected.

The method for judging whether the ceramic body is qualified comprises the following steps of observing by naked eyes, and generating electric arc at the outer wall of the ceramic body 7 to be detected if the ceramic body is broken down; meanwhile, the method also comprises the steps of arranging a circuit to detect the voltage of the outer wall of the ceramic body 7 to be detected so as to judge whether the ceramic body 7 to be detected reaches the standard, as shown in figure 2, connecting the grounding ring 6 and the high-voltage access end 10 of the ceramic body 7 to be detected with the positive and negative electrodes of the circuit respectively, if the ceramic body 7 to be detected has an electrical insulation defect, passing current in the circuit, so that the circuit and the circuit where the pulse generator 14 is located generate mutual inductance, the latter circuit provides a pulse counter electromotive force for the former circuit, the voltage measured in the former circuit generates pulse change, the former circuit is connected with the other circuit which is provided with a comparator, the voltage of the former circuit is compared with a preset voltage value, if the peak value of the measured voltage is originally lower than the preset voltage value and is higher than the preset voltage value or is originally higher than the preset voltage value and is higher than the preset voltage value, it can be concluded that the ceramic body to be tested has electrical insulation defects.

Example 2

The difference between this embodiment and embodiment 1 is that the spark plug ceramic body electrical insulation defect detection device in this embodiment will cooperate with a manipulator, etc., so as to achieve the purpose of automatic detection, for example, the ceramic body 7 to be detected is sent to a working position by the manipulator, the outer wall is sleeved with the grounding ring 6, then other manipulators sequentially insert the core rod 13 sleeved with the insulating sleeve into the inner cavity of the ceramic body 7 to be detected, place the silica gel plug 2 in the large end to be detected, and control the pressing plate and the air pressure clasping device to clasp tightly, and electrify for detection.

It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The device for detecting the electrical insulation defect of the spark plug ceramic body is characterized by comprising a core rod, a core rod insulating sleeve, a silica gel blocking sleeve, a grounding ring and a pneumatic holding device; the core rod is provided with a high-voltage access end and is inserted into the inner cavity of the ceramic body to be detected; the core bar insulating sleeve is wrapped on the outer wall of the core bar; the grounding ring is sleeved on the outer wall of the ceramic body to be tested; the silica gel blocking sleeve is sleeved at the end part of the ceramic body to be detected, and the air pressure holding device is arranged on two sides of the silica gel blocking sleeve.

2. The spark plug ceramic body electrical insulation defect detecting device as claimed in claim 1, wherein said air pressure clasping means comprises a mounting plate provided with a compressed air inlet, an air chamber and a POM frame; the POM framework is arranged on the inner side of the mounting plate, and the air chamber is arranged in the silica gel sheath on the POM framework.

3. The spark plug ceramic body electrical insulation defect detection device of claim 1, wherein the wrapping start point of the core rod insulation sleeve is located at the high voltage access end of the core rod, and the wrapping length does not exceed the length of the core rod.

4. The device for detecting the defect of the electrical insulation of the ceramic body of the spark plug as claimed in claim 3, wherein an insulation support pad is further sleeved outside the core rod insulation sleeve.

5. The spark plug ceramic body electrical insulation defect detecting device of claim 1, wherein the core rod is a ball-end core rod.

6. The apparatus for detecting the defect of electrical insulation in ceramic body of spark plug as claimed in claim 1, wherein a cover plate is further provided on the top of said plug sleeve.

7. The spark plug ceramic body electrical insulation defect detecting device as claimed in claim 1, wherein said core rod is inserted from a small end of the ceramic body to be tested; the silica gel plug sleeve is sleeved at the big end of the ceramic body to be tested.