Piston air tightness detection device based on dynamic seal

Abstract

The invention relates to a piston air tightness detection device based on dynamic sealing, which relates to the technical field of aerospace piston air tightness testing and comprises a detected object piston, a transmission system, a visual detection system and the like. The transmission system can realize three motion modes of reciprocating motion, rotating motion and reciprocating and rotating motion of the piston connecting rod. The air tightness of the piston to be detected is tested by injecting high-pressure and low-pressure gas under the movement of the piston connecting rod, if the air tightness of the piston is unqualified, bubbles are generated at the piston hole 1 or the piston hole 2, and the air tightness of the piston is detected by automatically identifying and capturing the tiny bubbles through a visual detection system. The piston airtightness detection device has the beneficial effects that automatic, rapid, effective and accurate airtightness detection can be carried out on the piston in the spaceflight red oil medium environment, the requirement of the spaceflight field for piston airtightness detection is met, and safe and efficient operation of a spaceflight craft is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aerospace piston testing, and is used for detecting the air tightness of a piston. Background Art

[0002] The piston has a wide range of applications. In the aerospace field, the piston is one of the important workpieces that performs reciprocating motion. Its structure is divided into the top, skirt and piston pin seat. When the aerospace engine is running, the piston needs to work under extremely harsh conditions. Therefore, it is very important to detect the air tightness of the piston, which plays a fundamental role in the stable output of strong power of the aerospace engine, the realization of efficient combustion process, and the safety and reliability of the flight process.

[0003] However, the existing aerospace piston testing technology has obvious limitations. First, it is difficult to achieve dynamic sealing in liquid media during piston testing; second, the bubbles generated during piston testing are tiny and difficult to observe with the human eye, and the detection accuracy is difficult to meet the aerospace field's piston air tightness testing standards. Therefore, it is urgent to develop a device suitable for piston air tightness testing in liquid media to improve the stability of the aerospace system and ensure the safe and efficient operation of aerospace vehicles. Summary of the invention

[0004] In order to solve the technical problems existing in the current background technology, the present invention proposes a piston air tightness detection device based on dynamic seal, which can perform high-precision piston air tightness detection in medium such as aerospace red oil.

[0005] The present invention proposes a piston air tightness detection device based on dynamic seal, comprising: The servo motor drives the supporting platform to move horizontally on the slide rail and drives the gear to rotate.

[0006] The coupling 1 is connected to the servo motor at one end and to the reducer at the other end, so as to transmit the force of the servo motor to the transmission system.

[0007] The piston connecting rod is connected to the coupling 2 to realize three kinds of motions: reciprocating motion, rotary motion, and reciprocating and rotary motion.

[0008] The glass panel 1 is used to separate the piston air tightness detection device based on dynamic sealing, and the right side thereof is the test medium, so that the piston connecting rod passing through the glass panel forms a dynamic seal when realizing three movement modes.

[0009] The test medium is arranged on the right side of the glass panel.

[0010] The piston, as the object to be tested, is placed in the test medium and subjected to an airtightness test.

[0011] The piston hole 1 is located at the front end of the piston and is the hole at the connection between the piston connecting rod and the piston.

[0012] The piston hole 2 is located at the rear end of the piston.

[0013] The transmission system drives the piston connecting rod to perform three motion modes: reciprocating motion, rotational motion, and reciprocating and rotational motion.

[0014] The visual inspection system detects whether bubbles are generated at the piston hole 1 and the piston hole 2 when the piston connecting rod moves, and then performs air tightness inspection and judgment on the piston of the object to be inspected.

[0015] Preferably, the transmission system comprises: The supporting platform is connected to the coupling 1, has a hole in the middle, and has grooves on both sides for embedding the slide rails.

[0016] The reducer is arranged above the supporting platform and is used for reducing the rotation speed and increasing the torque.

[0017] The slide rail is arranged below the support platform to realize the sliding of the support platform.

[0018] The gear train, consisting of gear 1, gear 2 and gear 3, is arranged at the hole in the middle of the supporting platform and placed vertically, and the bottom gear is provided with a transmission shaft.

[0019] The transmission shaft is connected to the gear 3 of the gear train at one end and to the coupling 2 at the other end, transmitting the force of the gear transmission to the piston connecting rod.

[0020] One end of the coupling 2 is connected to the transmission shaft, and the gear 3 drives the coupling 2 to move. The other end is connected and fixed to the piston connecting rod, driving the piston connecting rod to perform three motion modes: reciprocating motion, rotational motion, and reciprocating and rotational motion.

[0021] Preferably, the visual inspection system comprises: The camera guide is arranged on the right side of the piston of the measured object to achieve adjustable distance between the camera and the bubble.

[0022] The camera base is arranged below the camera rail and fixed with bolts, and is used for placing the camera rail and the camera.

[0023] The camera is arranged on the upper part of the camera rail. The camera can move horizontally on the camera rail to adjust the camera position, realize the adaptability of the distance between the camera and the shooting bubble, and capture the bubbles appearing at the shooting piston hole 1 and the piston hole 2.

[0024] The light source is arranged in front of the camera to provide light for the camera.

[0025] Compared with the prior art, the beneficial effects brought by the present invention are: 1. By injecting high and low pressure gases into the piston of the object to be tested, driven by the transmission system, dynamic sealing of the piston connecting rod and three motion modes of reciprocating motion, rotary motion, and reciprocating and rotary motion can be achieved. If the air tightness of the piston is unqualified, the gas will leak from the piston hole 1 or the piston hole 2 and generate bubbles in the test medium.

[0026] 2. By moving the camera guide, the distance between the camera and the shooting bubble can be adapted, and the bubbles at piston holes 1 and 2 can be automatically identified and captured through the difference method and grayscale image difference processing, thereby realizing the detection of piston air tightness, meeting the requirements of the aerospace field for piston air tightness detection, and ensuring the safe and efficient operation of the aerospace vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram disclosed in the present invention; Figure 2 It is a schematic diagram of the transmission system disclosed in the present invention; Figure 3 This is a view of the piston seal disclosed in the present invention; Figure 4 It is a schematic diagram of the visual inspection system disclosed in the present invention.

[0028] Among them: 1-1 servo motor, 1-2 coupling 1, 2 transmission system, 2-1 reducer, 2-2 gear train, 2-2-1 gear 1, 2-2-2 gear 2, 2-2-3 gear 3, 2-3 support platform, 2-4 slide rail, 2-5 transmission shaft, 2-6 coupling 2, 3-1 glass panel, 3-2 piston connecting rod, 3-3 piston, 3-4 piston hole 1, 3-5 piston hole 2, 3-6 test medium, 4 visual inspection system, 4-1 light source, 4-2 camera, 4-3 camera guide rail, 4-4 camera base. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "1" and "2" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] Reference Figure 1 , Figure 2 The present invention proposes a piston air tightness detection device based on dynamic seal, comprising: The servo motor (1-1) drives the support platform (2-3) to perform horizontal movement on the slide rail (2-4) and drives the wheel train (2-2) to perform rotational movement.

[0032] The coupling 1 (1-2) has one end connected to the servo motor (1-1) and the other end connected to the reducer (2-1), so as to transmit the force of the servo motor (1-1) to the transmission system (2).

[0033] The transmission system (2) is used to drive the piston connecting rod (3-2) to perform three motion modes: reciprocating motion, rotational motion, and reciprocating and rotational motion.

[0034] Furthermore, the transmission system (2) comprises: The supporting platform (2-3) is connected to the coupling 1 (1-2), has a hole in the middle, and has grooves on both sides, and is embedded in the slide rail (2-4).

[0035] The reducer (2-1) is arranged above the supporting platform (2-3) and is used to reduce the rotation speed and increase the torque.

[0036] The slide rail (2-4) is arranged below the support platform (2-3) to enable the support platform (2-3) to slide.

[0037] The gear train (2-2) is composed of gear 1 (2-2-1), gear 2 (2-2-2) and gear 3 (2-2-3), which is arranged at a hole in the middle of the support platform (2-3) and placed vertically, and the gear 3 (2-2-3) at the bottom is provided with a transmission shaft (2-5).

[0038] The transmission shaft (2-5) has one end connected to the gear 3 (2-2-3) of the gear train (2-2) and the other end connected to the coupling 2 (2-6), so as to transmit the force transmitted by the gear train (2-2) to the piston connecting rod (3-2).

[0039] One end of the coupling 2 (2-6) is connected to the transmission shaft (2-5), and the gear 3 (2-2-3) drives the coupling 2 (2-6) to move. The other end is connected and fixed to the piston connecting rod (3-2), driving the piston connecting rod (3-2) to perform three motion modes: reciprocating motion, rotational motion, and reciprocating and rotational motion.

[0040] Combination Figure 1 , Figure 2 When a piston air tightness detection device based on dynamic seal is working, the servo motor (1-1) drives the support platform (2-3) to move horizontally on the slide rail (2-4) through the coupling 1 (1-2), and at the same time, the servo motor (1-1) transmits force to the reducer (2-1) to realize the movement of the gear train (2-2), the gear 1 (2-2-1) is meshed with the gear 2 (2-2-2), and the gear 2 (2-2-2) is meshed with the gear 3 (2-2-3) to realize the transmission of power, one end of the transmission shaft (2-5) is connected to the gear 3 (2-2-3) of the gear train (2-2), and the other end is connected to the coupling 2 (2-6), so as to transmit the force transmitted by the gear train (2-2) to the coupling 2 (2-6), and one end of the coupling 2 (2-6) is connected to the transmission shaft (2-5), and the other end is connected and fixed to the piston connecting rod (3-2).

[0041] Reference Figure 1 , Figure 3 The present invention proposes a piston air tightness detection device based on dynamic seal, comprising: The piston connecting rod (3-2) is connected to the coupling 2 (2-6) and performs three kinds of motions: reciprocating motion, rotational motion, and reciprocating and rotational motion.

[0042] The glass panel 1 (3-1) is used to separate the piston air tightness detection device based on dynamic sealing, and the right side thereof is a test medium (3-6), so that when the piston connecting rod (3-2) passing through the glass panel (3-1) realizes three movement modes, a dynamic seal is formed.

[0043] The test medium (3-6) is arranged on the right side of the glass panel (3-1).

[0044] The piston (3-3), as a tested object, is placed in the test medium (3-6) and subjected to an airtightness test.

[0045] The piston hole 1 (3-4) is located at the front end of the piston (3-3) and is a hole at the connection between the piston connecting rod (3-2) and the piston (3-3).

[0046] The piston hole 2 (3-5) is located at the rear end of the piston (3-3).

[0047] Combination Figure 1 , Figure 3The piston connecting rod (3-2) passing through the glass panel (3-1) performs three kinds of motions, namely, reciprocating motion, rotational motion, and reciprocating and rotational motion, in the test medium (3-6) environment through the transmission of the transmission shaft (2-5), thereby forming a dynamic seal, so that the gas inside the piston (3-3) is squeezed. If the airtightness of the piston is unqualified, bubbles are generated at the piston hole 1 (3-4) or the piston hole 2 (3-5).

[0048] Reference Figure 1 , Figure 4 The present invention proposes a piston air tightness detection device based on dynamic seal, comprising: The visual inspection system (4) detects whether bubbles are generated in the piston hole 1 (3-4) and the piston hole 2 (3-5) when the piston connecting rod (3-2) moves, thereby performing air tightness inspection on the piston (3-3) to be inspected.

[0049] Furthermore, the visual inspection system (4) comprises: The camera guide rail (4-3) is arranged on the right side of the piston (3-3) of the measured object, so as to achieve an adjustable distance between the camera (4-2) and the bubble.

[0050] The camera base (4-4) is arranged below the camera guide rail (4-3) and is used to place the camera guide rail (4-3) and the camera (4-2).

[0051] The camera (4-2) is arranged on the upper part of the camera rail (4-3). The camera can move horizontally on the camera rail (4-3) to adjust the position of the camera (4-2) to achieve adaptability of the distance between the camera (4-2) and the shooting bubble, and capture the bubble appearing at the shooting piston hole 1 (3-4) and the piston hole 2 (3-5).

[0052] The light source (4-1) is arranged in front of the camera (4-2) to provide light for the camera (4-2).

[0053] Combination Figure 1 , 4 The camera (4-2) is adjusted to a suitable position through the camera guide rail (4-3). If the air tightness of the piston (3-3) of the tested object is unqualified, the camera (4-2) identifies and captures tiny bubbles at the piston hole 1 (3-4) and the piston hole 2 (3-5) and completes taking pictures and recording, and it is determined that the air tightness of the piston (3-3) of the tested object is unqualified.

[0054] When using this patent, first put the piston (3-3) into a piston air tightness detection device based on dynamic sealing, pour the test medium (3-6) to the right side of the glass panel (3-1), and inject gas into the piston (3-3). Start a piston air tightness detection device based on dynamic sealing, the servo motor (1-1) works, the reducer (2-1) works, drives the support platform (2-3) to move horizontally, and drives the gear train (2-2) to rotate, drives the coupling 2 (2-6) to move horizontally and rotationally, and makes the piston connecting rod (3-2) perform three kinds of movements: reciprocating motion, rotational motion, and reciprocating and rotational motion. If the air tightness of the piston (3-3) is unqualified, gas will leak from the piston hole 1 (3-4) or the piston hole 2 (3-5) and produce tiny bubbles. At this time, the camera (4-2) recognizes and captures the bubbles and completes taking pictures and recording, and judges that the air tightness of this piston (3-3) is unqualified. Otherwise, it is qualified.

[0055] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be used without departing from the spirit or scope of the present application. The above disclosed methods and technical contents can be used to make possible changes and modifications to the technical solutions of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solutions of the present invention are within the protection scope of the technical solutions of the present invention.

Claims

1. A piston air tightness detection device based on dynamic seal, characterized in that: include: The piston connecting rod (3-2) can realize three motion modes under the action of the transmission system (2), namely, reciprocating motion, rotational motion, and reciprocating and rotational motion. The piston (3-3) of the object to be tested is placed in the test medium (3-6) and driven by the piston connecting rod (3-2) to realize dynamic sealing and the above three motion modes. The air tightness of the piston (3-3) of the object to be tested is tested by a visual inspection system (4).

2. A piston air tightness detection device based on dynamic seal according to claim 1, characterized in that: The transmission system (2) comprises: a reducer (2-1), a wheel train (2-2), a support platform (2-3), a slide rail (2-4), a transmission shaft (2-5), and a coupling 2 (2-6). The rotation of the wheel train (2-2) and the reciprocating motion of the slide rail (2-4) drive the transmission of the coupling 2 (2-6) and the transmission shaft (2-5), thereby realizing three motion modes of the piston connecting rod (3-2), namely, reciprocating motion, rotational motion, and reciprocating and rotational motion.

3. The piston air tightness detection device based on dynamic seal according to claim 1 is characterized in that: The visual inspection system (4) comprises: a light source (4-1), a camera (4-2), a camera guide rail (4-3) and a camera base (4-4). The camera guide rail (4-3) is used to achieve adaptability of the distance between the camera (4-2) and the captured bubble. The visual inspection system (4) can automatically identify and capture bubbles at the piston hole 1 (3-4) and the piston hole 2 (3-5) through a difference method and grayscale image difference processing, thereby achieving detection of the air tightness of the piston (3-3).

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