A rolling torsion testing device and method for O-rings

Abstract

This invention relates to the field of aircraft maintenance tolerance research, specifically to an O-ring rolling torsion testing device and its testing method. The device includes a base, an upper test plate and a lower test plate in close contact with the O-ring, a connecting rod threaded to the upper test plate, a long connecting rod bolted to the connecting rod, a short connecting rod bolted to the long connecting rod, a motor keyed to the short connecting rod, and a roller in close contact with the upper test plate. The specific steps are as follows: S1, cleaning impurities; S2, transmitting power; S3, recording data; S4, maintenance. This invention simulates complex actual working conditions, enabling direct observation of the torsional rolling of the O-ring. It can also measure the torsional rolling changes of the O-ring under various working conditions, solving the problem of not being able to actually observe the torsional rolling of the O-ring during use.

Description

Technical Field

[0001] This invention relates to the field of aircraft maintenance tolerance research, specifically to an O-ring rolling torsion testing device and its testing method. Background Technology

[0002] Hydraulic transmission technology is a transmission method that uses liquid as the working medium for energy transfer and behavior control. Due to its high power density, high rigidity, fast response, and high reliability, it is widely used in mining, wind power, automotive, medical equipment, and aerospace industries. Hydraulic linear reciprocating seals belong to the rubber-plastic seal category. Made from materials such as rubber and engineering plastics, these seals are widely used in hydraulic transmission systems due to their excellent tracking and compensation properties, good wear resistance and media resistance, as well as good processability and economy. They are a key fundamental component of the entire hydraulic transmission system, preventing hydraulic oil leakage or external contaminants such as particles from entering the hydraulic system, which could lead to reduced overall efficiency or malfunction.

[0003] According to incomplete statistics, hydraulic system seal failure accounts for approximately 30% of all mechanical equipment malfunctions. Among these, failure of dynamic seals accounts for over 90% of aircraft actuator repairs or replacements. Hydraulic seal failure not only reduces overall machine efficiency and causes economic losses, but in severe cases, it can even lead to irreparable personal injury accidents. According to the American magazine *Factory & Industry*, the US industrial sector loses as much as 380 million liters of hydraulic oil annually due to seal failure, resulting in direct losses of $60 million per year. In the UK, hydraulic system leaks cause losses of up to $180 million annually. In 1986, the US Space Shuttle Challenger exploded and disintegrated 73 seconds after launch due to a hardening failure of an O-ring on its right solid rocket booster caused by cryogenic temperatures, resulting in the deaths of seven astronauts. In 2014, the US F-35 stealth fighter jet was grounded after oil leaks were discovered during test flights, marking what was considered the most expensive project shutdown in Pentagon history. Therefore, observing the torsional rolling motion of O-rings during reciprocating motion is not only instructive for improving the performance of O-rings themselves, but also improves the hydraulic efficiency of the whole machine, ensures the reliability of the whole machine operation, and reduces huge economic losses, thus having great significance. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an O-ring rolling torsion detection device and its detection method.

[0005] An O-ring rolling torsion testing device includes a base, an upper test plate and a lower test plate that are in close contact with the O-ring, a connecting rod that is threaded to the upper test plate, a long connecting rod that is bolted to the connecting rod, a short connecting rod that is bolted to the long connecting rod, a motor that is keyed to the short connecting rod, and a roller that is in close contact with the upper test plate.

[0006] The lower test plate is provided with a groove for placing and easily replacing the O-ring.

[0007] The upper and lower test plates are made of glass bricks.

[0008] The connecting rod is made of 15-5PH structural steel or stainless steel; the long connecting rod and the short connecting rod are made of carbon structural steel, carbon alloy steel or ductile iron; and are processed by forging or casting.

[0009] The O-ring is made of nitrile rubber.

[0010] The base 10 is also equipped with a beaker that can collect the leaked lubricating oil.

[0011] The base 10 is also provided with a fixing frame for placing the rollers.

[0012] The base 10 is fixed to the fixing frame by a control pin.

[0013] A testing method for an O-ring rolling torsion testing device, the specific steps of which are as follows:

[0014] S1. Cleaning impurities: Before the experiment, the upper and lower test plates are ultrasonically cleaned for more than 10 minutes to prevent impurities in the device from interfering with the experimental results. A recording camera is set up above the experimental platform.

[0015] S2. Power transmission: The mechanism composed of long and short connecting rods transmits power to the upper test plate. When the motor is turned on, the short connecting rod rotates, causing the upper test plate to reciprocate linearly in the space between the rollers.

[0016] S3. Record data: Observe the torsion and rolling of the O-ring during the reciprocating motion, and use a camera to record its torsion angle, number of torsions, and number of rollings;

[0017] S4. Maintenance: After the experiment, turn off the motor, disassemble the O-ring, and carry out subsequent microscopic measurement work. Clean the beaker, upper test plate and lower test plate in the test device, and apply anti-rust oil to the device for maintenance.

[0018] The motor used in step S2 can be a regular motor.

[0019] The beneficial effects of this invention are: it simulates complex actual working conditions, enabling direct observation of the torsional rolling of O-rings; its structure is relatively simple, and its design closely matches the actual working environment of O-rings; it can also measure the torsional rolling changes of O-rings under various working conditions, solving the problem of not being able to actually observe the torsional rolling of O-rings during use; this invention has wide applications in the field of hydraulic transmission, the device is relatively simple to build and easy to use, and it is easy to promote. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0024] like Figure 1 and Figure 2 As shown, an O-ring rolling torsion testing device includes a base 10, an upper test plate 3 and a lower test plate 1 that are in close contact with the O-ring 2, a connecting rod 6 that is threaded to the upper test plate 3, a long connecting rod 7 that is bolted to the connecting rod 6, a short connecting rod 8 that is bolted to the long connecting rod 7, a motor 9 that is keyed to the short connecting rod 8, and a roller 5 that is in close contact with the upper test plate 3.

[0025] The lower test plate 1 is provided with a groove for placing and facilitating the replacement of the O-ring 2. The O-ring 2 fits tightly against the friction surface to simulate the working conditions of the O-ring 2.

[0026] The upper test plate 3 and the lower test plate 1 are 60cm×40cm×10cm in size and are made of glass bricks.

[0027] The connecting rod 6 is made of 15-5PH structural steel or stainless steel and is 25cm long; the long connecting rod 7 and the short connecting rod 8 are made of carbon structural steel, carbon alloy steel or ductile iron and are processed by forging or casting.

[0028] The O-ring 2 is made of nitrile rubber and has a diameter of 6cm.

[0029] The base 10 is also equipped with a beaker 12 that can collect the leaked lubricating oil. During the experiment, when the hydraulic oil leaks, the leaked liquid flows down the side wall of the lower test plate 1, and the beaker 12 collects the leaked hydraulic oil to reduce the contamination of the experimental equipment.

[0030] The base 10 is also provided with a fixing frame 4 for placing the rollers 5.

[0031] The base 10 and the fixing frame 4 are fixed by a control pin 11.

[0032] This invention simulates complex actual working conditions, enabling direct observation of the torsional rolling of the O-ring 2. Its structure is relatively simple, and its design closely matches the actual working environment of the O-ring 2. It can also measure the torsional rolling changes of the O-ring 2 under various working conditions, solving the problem of the inability to actually observe the torsional rolling of the O-ring 2 during use. This invention has wide applications in the field of hydraulic transmission; the device is relatively simple to build and easy to use, making it easy to promote.

[0033] A testing method for an O-ring rolling torsion testing device, the specific steps of which are as follows:

[0034] S1. Cleaning impurities: Before the experiment, ultrasonically clean the upper test plate 3 and the lower test plate 1 for more than 10 minutes to prevent impurities in the device from interfering with the experimental results. A recording camera is set up above the experimental platform.

[0035] S2. Power transmission: The mechanism composed of long connecting rod 7 and short connecting rod 8 transmits power to the upper test plate 3. When the motor is turned on, short connecting rod 8 rotates, causing the upper test plate 3 to reciprocate linearly in the space between the rollers 5.

[0036] S3. Record data: Observe the torsion and rolling of the O-ring 2 during the reciprocating motion, and use a camera to record its torsion angle, number of torsions, and number of rollings;

[0037] S4. Maintenance: After the experiment, turn off the motor, disassemble the O-ring 2, and carry out subsequent microscopic measurement work. Clean the beaker 12, upper test plate 3 and lower test plate 1 in the test device, and apply anti-rust oil to the device for maintenance.

[0038] In step S1, when cleaning the surface of the cleaning device, it is also necessary to clean the O-ring 2, soak the O-ring 2 in aviation hydraulic oil for 2-3 hours, apply the aviation hydraulic oil to the groove of the lower test plate 1 and the surface of the upper test plate 3, and then insert the O-ring 2 into the groove of the lower test plate 1.

[0039] The motor in step S2 can be an ordinary motor. When the motor is started, the movement of the O-ring 2 under complex working conditions is simulated by changing the motor speed. A mechanism consisting of a long connecting rod 7 and a short connecting rod 8 is used to enable the upper test plate 3 to reciprocate. By changing the speed of the motor, the movement of the O-ring 2 under different working conditions can be simulated, thereby comparing the differences in the torsional rolling phenomenon of the O-ring 2 under different working conditions.

[0040] In step S3, directly observing the reciprocating motion of the O-ring 2 helps to analyze the torsional rolling angle and number of times during the torsional rolling motion of the O-ring 2.

[0041] In step S4, the torsional rolling phenomenon of the O-ring 2 during reciprocating motion is directly observed through the device, and its performance during use is evaluated.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A rolling torsion detection device for O-rings, comprising a base (10), characterized in that: It also includes an upper test plate (3) and a lower test plate (1) that are in close contact with the O-ring (2), a connecting rod (6) that is threaded to the upper test plate (3), a long connecting rod (7) that is bolted to the connecting rod (6), a short connecting rod (8) that is bolted to the long connecting rod (7), a motor (9) that is keyed to the short connecting rod (8), and a roller (5) that is in close contact with the upper test plate (3). A recording camera is set up above the experimental platform to record its torsion angle, number of torsions, and number of rollings.

2. The O-ring rolling torsion detection device according to claim 1, characterized in that: The lower test plate (1) is provided with a groove for placing and facilitating the replacement of the O-ring (2).

3. The O-ring rolling torsion detection device according to claim 1, characterized in that: The upper test plate (3) and the lower test plate (1) are made of glass bricks.

4. The O-ring rolling torsion detection device according to claim 1, characterized in that: The connecting rod (6) is made of 15-5PH structural steel or stainless steel; the long connecting rod (7) and the short connecting rod (8) are made of carbon structural steel, carbon alloy steel or ductile iron; and are processed by forging or casting.

5. The O-ring rolling torsion detection device according to claim 1, characterized in that: The O-ring (2) is made of nitrile rubber.

6. The O-ring rolling torsion detection device according to claim 1, characterized in that: The base (10) is also provided with a beaker (12) for collecting the leaked lubricating oil.

7. The O-ring rolling torsion detection device according to claim 1, characterized in that: The base (10) is also provided with a fixing frame (4) for placing the rollers (5).

8. The O-ring rolling torsion detection device according to claim 7, characterized in that: The base (10) and the fixing frame (4) are fixed by a control pin (11).

9. A detection method using the O-ring rolling torsion detection device according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: S1. Cleaning impurities: Before the experiment, the upper test plate (3) and the lower test plate (1) are ultrasonically cleaned for more than 10 minutes to prevent impurities in the device from interfering with the experimental results. A recording camera is set up above the experimental platform. S2, power transmission: The mechanism consisting of long connecting rod (7) and short connecting rod (8) transmits power to the upper test plate (3). When the motor is turned on, the short connecting rod (8) rotates, causing the upper test plate (3) to reciprocate linearly in the space between the rollers (5). S3. Record data: Observe the torsion and rolling of the O-ring (2) during the reciprocating motion, and use a camera to record its torsion angle, number of torsions, and number of rollings; S4. Maintenance: After the experiment, turn off the motor, disassemble the O-ring (2), carry out subsequent work such as micro-measurement, clean the beaker (12), upper test plate (3) and lower test plate (1) in the test device, and apply anti-rust oil to the device for maintenance.

10. The detection method of the O-ring rolling torsion detection device according to claim 9, characterized in that: The motor used in step S2 can be a regular motor.

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