Device for high-precision detection of transmittance of metal piston ring

Abstract

The utility model discloses a device for high-precision detection of light transmittance of a metal piston ring. A tray is arranged at the upper end of a supporting rod, a circular ring is arranged on a three-legged bracket, a light-transmitting shooting system is installed on the circular ring, and a lining is arranged under the light-transmitting shooting system; the center of the inner threaded column is connected with a screw rod at the lower end of the supporting rod; a light source assembly is mounted above the bracket in the bushing; a detected piston ring is placed on the tray of the supporting rod. According to the utility model, the detection accuracy is greatly improved, human subjective factors are eliminated, the structure is simple, and the operation is convenient. The light-transmitting shooting system carries out image processing through a computer, manual light-transmitting gap point collection is not needed, the method is more reliable and accurate, and systematization of piston ring light transmittance evaluation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of light transmittance detection of metal expansion rings, in particular to a device for detecting light transmittance of metal expansion rings with high precision. Background Art

[0002] Metal expansion rings are critical sealing devices in aircraft engines. For example, in the main bearing cavity of an aircraft engine, metal expansion ring contact seals are used to isolate the bearing cavity from the air or gas flow path, preventing high-temperature gases from leaking into the bearing cavity, potentially coking the lubricating oil and burning the bearing. They also prevent lubricating oil from leaking into the hot gas flow path. Therefore, the design and manufacturing quality of the metal expansion ring determines its sealing performance, directly impacting the safe operation and efficiency of the engine. Good sealing performance requires a tight fit between the working surface and the inner diameter of the bushing (for external expansion rings) or the outer diameter of the journal (for internal contraction rings). Before installation, light transmission testing is often used to assess sealing performance, using light transmittance to evaluate the seal quality. Currently, there are two methods for testing the light transmittance of expansion rings. One involves mounting the ring in a matching gauge ring and visually inspecting its light transmittance under natural light or a lamp. For example, the Chinese patent "Expansion Ring Light Transmittance Inspection Device" (Publication No. CN201522264U) describes a device for inspecting the light transmittance of expansion rings for aircraft engine seals. The device manually rotates the test ring so that the joint between the inner hole of the test ring and the outer diameter of the ring passes through the light-transmitting groove. The light transmittance of the expansion ring is then inspected visually under light or with a feeler gauge. Another method involves mounting the ring on a flat plate with light-transmitting grooves, supported by a bracket. The ring is then rotated to visually inspect the light transmittance at each joint. Both methods suffer from the fact that light transmittance assessment relies on visual inspection by the inspector, resulting in significant errors and uncertainty. Summary of the Invention

[0003] In order to efficiently and accurately detect the transmittance of a metal expansion ring, the utility model proposes a device for detecting the transmittance of a metal expansion ring with high precision, eliminating the uncertainty brought by human visual observation and the detection error caused thereby.

[0004] The utility model adopts the following technical solutions to achieve the above-mentioned purpose. A device for detecting the light transmittance of a metal expansion ring with high precision, comprising a support rod, a bushing, a light source assembly, a light transmission shooting system, a tripod and a base; a tray is provided at the upper end of the support rod, a screw is provided at the lower end, and the end of the screw is a cylindrical top shaft; a ring is provided on the tripod, a support leg is provided below the ring, the light transmission shooting system is installed above the ring, and the bushing is provided just below the light transmission shooting system; the bushing is cylindrical, and an internal threaded column is provided at the center of the bottom through a bracket, and the center of the internal threaded column is connected to the screw at the lower end of the support rod; a light source assembly is installed above the bracket inside the bushing; the expansion ring to be detected is placed on the tray of the support rod; the bushing is placed horizontally above the base.

[0005] Furthermore, the gap between the inner periphery of the upper end of the bushing and the outer periphery of the tray is 1-2 mm.

[0006] Furthermore, the upper end surface of the bushing is higher than the upper plane of the tray, and its height is the thickness of the expansion ring.

[0007] Furthermore, the supporting legs are evenly hinged below the ring.

[0008] Furthermore, the light source assembly is a LET bulb.

[0009] Furthermore, the light source assembly is a LET light strip.

[0010] The utility model greatly improves the detection accuracy, eliminates the subjective factors of human beings, has a simple structure and is easy to operate. The light transmission shooting system uses computer image processing, does not require manual light transmission gap sampling, is more reliable and accurate, and thus realizes the systematization of the light transmission evaluation of the expansion ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0012] Figure 2 This is an internal cross-sectional structural diagram of the utility model;

[0013] Figure 3 This is a front view of the support rod 1 in the utility model;

[0014] Figure 4 It is the original light-transmitting image captured by the present invention;

[0015] In the figure: 1-support rod, 11-tray, 12-screw, 13-top shaft; 2-bushing, 21-bracket, 22-inner threaded column; 3-light source assembly; 4-detected expansion ring; 5-transmitted light shooting system; 6-trip bracket, 61-ring, 62-support leg; 7-base. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 4A device for detecting the light transmittance of a metal expansion ring with high precision comprises a support rod 1, a bushing 2, a light source assembly 3, a light transmission shooting system 5, a tripod 6 and a base 7; a tray 11 is provided at the upper end of the support rod 1, a screw rod 12 is provided at the lower end, and the end of the screw rod 12 is a square cylindrical top shaft 13; a circular ring 61 is provided on the tripod 6, and legs 62 are provided below the circular ring 61, and the legs 62 are evenly hinged to the bottom of the circular ring 61. The light transmission shooting system 5 is installed on the circular ring 61, and the bushing 2 is provided directly below the light transmission shooting system 5, and the gap between the inner periphery of the upper end of the bushing 2 and the outer periphery of the tray 11 is 1-2 mm. The upper end surface of the bushing 2 is higher than the upper plane of the tray 11, and its height is equal to the thickness of the expansion ring 4. The bushing 2 is cylindrical, and an internal threaded column 22 is provided at the center of the bottom through a bracket 21. The center of the internal threaded column 22 is connected to the screw 12 at the lower end of the support rod 1; a light source assembly 3 is installed above the bracket 21 inside the bushing 2, and the light source assembly 3 is a LET bulb or a LET light strip; the expansion ring 4 to be tested is placed on the tray 11 of the support rod 1; the bushing 2 is placed horizontally above the base 7.

[0017] Example: A specific implementation case of the present invention is introduced below.

[0018] The operation and use method of the present utility model is as follows: Install the expansion ring 4 to be detected in a horizontal position. Use a wrench to rotate the support rod 1 with the square cylindrical top shaft 13, and adjust the height of the tray 11 to ensure that the upper end surface of the expansion ring 4 to be detected is flush with the upper end surface of the bushing 2. The three legs 62 of the tripod bracket 6 are hinged to the bottom of the ring 61. By adjusting the opening of the legs 62, the height, position and shooting angle of the light-transmitting shooting system 5 can be adjusted to ensure that the shooting angle is a direct downward perspective of the expansion ring 4 to be detected, and the expansion ring 4 is in the center position. Adjust the focal length of the light-transmitting shooting system 5 (BM-500GE industrial imaging camera), shoot in a dark environment, and obtain the original light-transmitting gap image (such as Figure 4 (as shown), the image is read and converted into a grayscale image, which is then converted into a binary image to distinguish the light-transmitting gap from other parts. An optical calculation model is used to calculate the light transmittance of the expansion ring. For example, the original light-transmitting image obtained by calculation shows a light transmittance of 61.54%.

Claims

1. A device for high-precision detection of light transmittance of metal expansion rings, characterized by: The invention comprises a support rod (1), a bushing (2), a light source assembly (3), a light-transmitting shooting system (5), a tripod bracket (6) and a base (7); the upper end of the support rod (1) is provided with a tray (11), the lower end is provided with a screw rod (12), the end of the screw rod (12) is a cylindrical top shaft (13); the tripod bracket (6) is provided with a ring (61) on the upper side, the support legs (62) are provided below the ring (61), and the light-transmitting shooting system ( 5), the bushing (2) is provided just below the light-transmitting shooting system (5); the bushing (2) is cylindrical, and an internal thread column (22) is provided at the center of the bottom through a bracket (21), and the center of the internal thread column (22) is connected to the screw (12) at the lower end of the support rod (1); a light source assembly (3) is installed above the bracket (21) inside the bushing (2); a detected expansion ring (4) is placed on the tray (11) of the support rod (1); the bushing (2) is placed horizontally above the base (7).

2. The device for detecting light transmittance of a metal expansion ring with high precision according to claim 1, characterized in that: The gap between the inner periphery of the upper end of the bushing (2) and the outer periphery of the tray (11) is 1-2 mm.

3. The device for detecting light transmittance of a metal expansion ring with high precision according to claim 1, characterized in that: The upper end surface of the bushing (2) is higher than the upper plane of the tray (11), and its height is the thickness of the expansion ring (4).

4. The device for detecting light transmittance of a metal expansion ring with high precision according to claim 1, characterized in that: The supporting legs (62) are evenly hinged below the circular ring (61).

5. The device for detecting light transmittance of a metal expansion ring with high precision according to claim 1, characterized in that: The light source assembly (3) is a LET bulb.

6. The device for detecting light transmittance of a metal expansion ring with high precision according to claim 1, characterized in that: The light source assembly (3) is a LET light strip.

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