CN112326734A

CN112326734A - Method for detecting cracks of zirconium piece of oxygen sensor

Info

Publication number: CN112326734A
Application number: CN202010999759.0A
Authority: CN
Inventors: 刘群
Original assignee: Kesens Power Technology Jiaxing Co ltd
Current assignee: Kesens Power Technology Jiaxing Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-02-05

Abstract

The invention discloses a zirconium piece crack detection method of an oxygen sensor, which comprises a heating part and a detection part, wherein the heating part comprises a heating power supply; the detection part comprises a detection power supply and a current acquisition module; the steps are as follows, S1: connecting the zirconium piece into a detection part, and connecting pins at two ends of the zirconium piece and a current acquisition module with a detection power supply in series; s2: connecting the zirconium piece into the heating part, and connecting a heating power supply in series with the zirconium piece; s3: heating the zirconium piece for a certain time by a heating power supply; s4: the method can quickly and effectively detect a large number of zirconium sheets of the oxygen sensor, so that the zirconium sheets are integrated into detection equipment of a production line, the products with the crack defects of the zirconium sheets can be effectively intercepted, and each finished product can be detected.

Description

Method for detecting cracks of zirconium piece of oxygen sensor

Technical Field

The invention belongs to the field of detection of oxygen sensors, and particularly relates to a zirconium piece crack detection method of an oxygen sensor.

Background

On the production line of the automobile oxygen sensor, the detection method is crucial to the electrical property detection of the oxygen sensor, and the detection means mainly imitates the environment of automobile use; the basic detection contents include "heater resistance" and "sensor resistance", but these oxygen sensors cannot detect cracks in the zirconium piece in the basic detection.

In the existing detection technology for detecting whether the zirconium piece of the oxygen sensor has cracks, the traditional method breaks the shell of the oxygen sensor, sends the shell to a special third-party detection mechanism, performs CT (computed tomography) scanning, and prints out the result for analysis as shown in figure 1; the method is high in cost, time-consuming and labor-consuming, and can cause secondary damage when the oxygen sensor shell is broken, so that the method is obviously only suitable for experimental analysis and is not suitable for being used on a production line.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method which can quickly and effectively detect a large number of zirconium sheets of an oxygen sensor, enables the zirconium sheets to be integrated into detection equipment of a production line, can effectively intercept crack defects of the zirconium sheets, and can detect each finished product.

In order to achieve the purpose, the invention provides the following technical scheme: the method for detecting the cracks of the zirconium piece of the oxygen sensor comprises a heating part and a detection part, wherein the heating part comprises a heating power supply; the detection part comprises a detection power supply and a current acquisition module; the steps are as follows,

s1: connecting the zirconium piece into a detection part, and connecting pins at two ends of the zirconium piece and a current acquisition module with a detection power supply in series;

s2: connecting the zirconium piece into the heating part, and connecting a heating power supply in series with the zirconium piece;

s3: heating the zirconium piece for a certain time by a heating power supply;

s4: and reading the current data of the current acquisition module, comparing the current data with a standard current range, determining that the product is unqualified if the current data is larger than or smaller than the standard current range, and determining that the product is qualified if the current data is within the standard current range.

The further zirconium piece comprises a heater and a sensor, in step S1, pins at two ends of the sensor and a current collecting module are connected in series with a detection power supply, and in step S2, the heater and a heating power supply are connected in series.

And further, the heating power supply and the detection power supply are both direct-current stabilized power supplies.

Further, in step S3, the heater is heated for 40 seconds by the heating power supply having a voltage of 13.5V.

Further in step S1, the voltage of the power supply is detected to be 0.4V.

Further in step S4, the current data of the current collection module is read between 40-70 seconds after the heater is powered on.

A further standard current range is 39 muA-20 muA.

Compared with the prior art, the invention has the beneficial effects that: the detection method can be integrated into production line detection equipment, can effectively intercept products with zirconium piece crack defects, can detect each type of finished products, can detect the zirconium piece in each stage of production, selects and rejects unqualified products in advance, can know in which process link the unqualified products are easy to appear, and further can correspondingly search problems and improve, provides important judgment basis for the quality problem from the products to the client, saves a large amount of financial resources and material resources, and brings direct economic benefit for companies.

Drawings

FIG. 1 is an image of a zirconium wafer after undergoing an electron computed tomography scan;

FIG. 2 is a detection schematic diagram of the crack detection method of the zirconium piece of the oxygen sensor.

Detailed Description

An embodiment of the method for detecting cracks in a zirconium piece of an oxygen sensor according to the present invention is further described with reference to fig. 2.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" or "a number" means two or more unless explicitly specified otherwise.

The zirconium plate of the oxygen sensor comprises two parts of a heater and a sensor, and the structure of the zirconium plate can refer to the content disclosed in the patent application with the application number of 201610859021.8.

The specific structural parameters of the oxygen sensor tested in this example are shown in table 1,

table 1:

physical size (Long)	53.5±0.5	mm
			Physical dimension (Wide)	4.5±0.1	mm
Physical size (high)	1.2±0.1	mm
			Thickness of pin	1.2±0.1	mm
Pin bending value	≤0.07	mm

The method for detecting the cracks of the zirconium piece of the oxygen sensor comprises a heating part and a detection part, wherein the heating part comprises a heating power supply; the detection part comprises a detection power supply and a current acquisition module; in the present embodiment, in step S1, the pins at both ends of the sensor and the current collecting module are connected in series with the detection power supply, and in step S2, the heater and the heating power supply are connected in series; the heating power supply and the detection power supply are both direct-current stabilized power supplies;

the specific steps are as follows,

s1: connecting a zirconium piece into a detection part, and connecting pins at two ends of the zirconium piece and a current acquisition module with a detection power supply in series, wherein the voltage of the detection power supply is 0.4V;

s2: connecting the zirconium piece into the heating part, and connecting a heating power supply with the zirconium piece in series;

s3: heating the heater by a heating power supply with a voltage of 13.5V for 40 seconds;

s4: and after the heater is electrified for 40 seconds, reading the current data of the current acquisition module of the detection part within 30 seconds, and comparing the current data with a standard current range, wherein the standard current range is 39-20 muA, if the current data is larger than or smaller than the standard current range, the product is unqualified, and if the current data is within the standard current range, the product is qualified.

In this embodiment, the on/off of the relay is used to control the start and stop of the detection.

In this example, 100 zirconium pieces in the production process were randomly selected, and all the zirconium pieces were tested in the processes of press fitting, closing, heat treatment, electrical property, and packaging of finished products (no subsequent process is performed after data abnormality), and the results of the test data are shown in table 2,

table 2 (units μ a):

from the analysis in table 2, the following conclusions can be drawn:

the method comprises the following steps of firstly, in each process stage, the fluctuation of zirconium piece crack data is very small, and the fluctuation range is 3.6 muA;

secondly, when the current data collected from the table is suddenly increased in a certain process, the zirconium piece cracks can be caused through the treatment of each process; the standard current range for the zirconium piece was derived from analysis of a large number of collected data.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A method for detecting cracks of a zirconium piece of an oxygen sensor is characterized by comprising the following steps: the detection device comprises a heating part and a detection part, wherein the heating part comprises a heating power supply; the detection part comprises a detection power supply and a current acquisition module; the steps are as follows,

s3: heating the zirconium piece for a certain time by a heating power supply;

2. The method for detecting cracks in a zirconium piece of an oxygen sensor according to claim 1, wherein: the zirconium piece comprises a heater and a sensor, in step S1, pins at two ends of the sensor and a current acquisition module are connected in series with a detection power supply, and in step S2, the heater and a heating power supply are connected in series.

3. The oxygen sensor zirconium piece crack detection method of claim 2, characterized in that: and the heating power supply and the detection power supply are both direct-current stabilized power supplies.

4. The oxygen sensor zirconium piece crack detection method of claim 3, characterized in that: in step S3, the heater is heated for 40 seconds by the heating power supply having a voltage of 13.5V.

5. The oxygen sensor zirconium piece crack detection method of claim 4, characterized in that: in step S1, the voltage of the power supply is detected to be 0.4V.

6. The oxygen sensor zirconium piece crack detection method of claim 5, characterized in that: in step S4, the current data of the current collection module is read between 40-70 seconds of heater energization.

7. The oxygen sensor zirconium piece crack detection method of claim 6, characterized in that: the standard current range is 39 muA-20 muA.