Reliability test device for swivel joint special for airplane refueling hard pipe

Abstract

The utility model relates to the field of testing devices, in particular to a reliability testing device for a swivel joint special for an airplane refueling hard pipe, which comprises a frame, an oil cavity is mounted on the frame, and the lower end of the oil cavity is detachably connected with an outer ring of the swivel joint to be tested; an energy accumulator, a thermometer and a pressure meter are mounted on the side wall of the oil cavity; the frame is further provided with a torque sensor, a driving piece, a connecting rod and a tension sensor. The output shaft of the torque sensor is detachably connected with the inner ring of the swivel joint to be tested, and the connecting rod is rotatably connected with the tension sensor. At present, there is no device for carrying out a reliability test on the swivel joint, and the utility model provides the reliability test device for the swivel joint special for the aircraft refueling hard pipe, which can carry out the reliability test on the swivel joint.

Description

Technical Field

[0001] The utility model relates to the field of testing devices, in particular to a reliability testing device for a special rotary joint of an aircraft refueling hard pipe. Background Art

[0002] When an aircraft is refueled on the ground, the aircraft fuel (hereinafter referred to as "fuel") can be added by gravity refueling and pressure refueling. Pressure refueling has become the main refueling method because it can reduce the workload of maintenance personnel, shorten the preparation time for re-deployment, does not require a refueling truck, and does not require protective measures in windy, rainy, and snowy weather.

[0003] During pressure refueling, a hard pipe with a faster refueling speed is usually used to transport fuel. However, the hard pipe cannot be rotated, which makes the operation more troublesome. Therefore, in order to reduce the difficulty of operation, the staff will use a special rotary joint for aircraft refueling hard pipe (hereinafter referred to as rotary joint) to assist. The specific structure of the rotary joint 1 is as follows Figure 1 As shown in the figure, a swivel joint allows flexible rotation of rigid pipes, ensuring that refueling operators can accurately connect the refueling hose to the aircraft's refueling port. A swivel joint primarily consists of an inner ring for transferring fuel and an outer ring for securing and protecting the internal structure. The inner ring can rotate around its central axis within the outer ring.

[0004] To ensure fuel transmission safety, the reliability of the rotary joint must be guaranteed. Therefore, reliability tests must be conducted on the rotary joint to test its sealing performance, operation performance under load, and lifespan. During reliability tests, it is necessary to simulate its working state to obtain the sealing performance, operation performance under load, and lifespan of the rotary joint.

[0005] Currently, there is a lack of equipment for conducting reliability tests on rotary joints. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a reliability test device for a special swivel joint for an aircraft refueling hard pipe, which can perform reliability tests on the swivel joint.

[0007] In order to solve the above technical problems, the utility model provides a reliability test device for a special rotary joint for aircraft refueling hard pipes, including a frame, on which an oil cavity for storing and containing fuel is installed, and the lower end of the oil cavity is detachably connected to the outer ring of the rotary joint to be tested; the oil cavity is a cylindrical structure with a single-side opening, and the opening of the oil cavity is facing downward. An energy accumulator for stabilizing the oil cavity pressure of the oil cavity, a thermometer for measuring the oil cavity temperature of the oil cavity, and a pressure gauge for measuring the oil cavity pressure of the oil cavity are installed on the side wall of the oil cavity; the frame is also equipped with a torque sensor for measuring the torque of the inner ring of the rotary joint to be tested, a driving member capable of driving the input shaft of the torque sensor to rotate alternately clockwise and counterclockwise, a length-adjustable connecting rod for providing adjustable tension to the oil cavity, and a tension sensor for measuring the tension provided by the connecting rod; the output shaft of the torque sensor is detachably connected to the inner ring of the rotary joint to be tested, and the connecting rod is rotationally connected to the tension sensor.

[0008] As a further improvement of the present invention: the rack is fixedly mounted on the top of the base, and at least two universal wheels are mounted on the bottom of the base.

[0009] As a further improvement of the present invention: the lower end of the oil cavity is detachably connected to the outer ring of the rotary joint to be tested through an adapter flange; the output shaft of the torque sensor is detachably connected to the inner ring of the rotary joint to be tested through a rotating shaft flange.

[0010] As a further improvement of the present invention, it is characterized in that a photoelectric switch capable of measuring the position of the rotary joint to be tested is installed on the torque sensor, and the photoelectric switch is control-connected to the torque sensor.

[0011] As a further improvement of the present invention: a pull ring is fixedly sleeved on the outer upper end of the oil chamber body, and the pull ring is rotatably connected to the end of the connecting rod away from the tension sensor. A T-shaped block is rotatably installed on the end of the tension sensor away from the connecting rod. The T-shaped block includes a horizontal part and a vertical part. The vertical part is rotatably connected to the end of the tension sensor away from the connecting rod. A limiting column is vertically installed on the surface of the horizontal part close to the right side wall of the shelf, and a plurality of limiting holes for inserting the limiting columns are opened from top to bottom on the right side wall.

[0012] As a further improvement of the present invention: the driving member includes a motor and a transmission member that is transmission-connected to the torque sensor; the transmission member includes an eccentric wheel fixedly mounted on the top end of the output shaft of the motor, the eccentric wheel includes a wheel body vertically fixedly mounted on the top end of the output shaft of the motor and an eccentric shaft vertically fixedly mounted on a side of the wheel body away from the output shaft of the motor, the eccentric shaft is rotatably connected to one end of a connecting rod, the end of the connecting rod away from the eccentric shaft is rotatably connected to one end of a rocker, and the end of the rocker away from the connecting rod is fixedly connected to the top end of the input shaft of the torque sensor.

[0013] The beneficial effects of the present invention are as follows: the reliability test device for a special swivel joint for an aircraft refueling hard pipe provided by the present invention can perform reliability tests on the swivel joint, test the sealing performance of the swivel joint, and its operation and service life under load conditions.

[0014] The device controls and collects oil chamber pressure and temperature through the coordination of an oil chamber, an energy accumulator, a thermometer, and a pressure gauge to simulate operating pressure and data recording. The connecting rod and tension sensor simulate the load of the rotary joint during operation. The torque sensor and driver cooperate to simulate the motion of the rotary joint during operation. The device is activated and time is recorded simultaneously, allowing real-time observation of the rotary joint for leaks (sealing), smooth rotation and abnormal noise (i.e., operating status), and leakage at the end of its estimated lifespan (lifespan), completing the reliability test. This device has a simple structure and strong versatility, making it suitable for widespread use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the rotary joint in the utility model;

[0016] Figure 2 A schematic diagram of the overall structure of the device provided by the utility model;

[0017] Figure 3 This is a schematic diagram of the overall structure of the device provided by the utility model from another angle;

[0018] Figure 4 This is a schematic diagram of the overall structure of the device and rotary joint provided by the utility model;

[0019] Figure 5 This is a front view of the device and rotary joint provided by the utility model;

[0020] Figure 6 This is a schematic diagram of the overall structure of the driving component and the torque sensor in the utility model;

[0021] Figure 7 This is a schematic diagram of the overall structure of the driving member and the torque sensor in the present invention from another angle;

[0022] Figure 8 This is an assembly diagram of the connecting rod, tension sensor, pull ring, T-shaped block and limit column in the utility model;

[0023] Figure 9 This is a schematic diagram of the positional relationship of the connecting rod, tension sensor, pull ring, T-shaped block, limit hole and part of the frame in the utility model;

[0024] Figure 10This is a schematic diagram of the positional relationship between the oil inlet, oil outlet and the rotating shaft flange of the utility model;

[0025] Figure 11 This is a schematic diagram of the overall structure of the oil cavity of the utility model;

[0026] Figure 12 This is a schematic diagram of the overall structure of the connecting rod in the present utility model;

[0027] The names of the components corresponding to the marks in the above drawings are:

[0028] 1. Rotary joint;

[0029] 201, shelf; 202, base; 203, universal wheel;

[0030] 3. Oil chamber; 4. Energy accumulator; 5. Thermometer; 6. Pressure gauge; 7. Torque sensor;

[0031] 8. Driving parts; 801. Motor; 802. Eccentric wheel; 803. Connecting rod; 804. Rocker;

[0032] 9. Connecting rod; 10. Tension sensor; 11. Adapter flange; 12. Rotating shaft flange; 13. Photoelectric switch; 14. Pull ring; 15. T-block; 16. Limit column; 17. Limit hole; 18. Electric control box. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] The directional words such as "up", "down", "left", "right", "front", "back", "top", "bottom" in this utility model are all represented by Figure 5 The directions defined by the cross-shaped orientation mark are used as a reference. All orientation words in this utility model are described based on this definition and do not change the directions they represent when the angle of the figure changes.

[0035] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 11As shown, the reliability test device of a special rotary joint 1 for aircraft refueling hard pipe provided by the utility model includes a square frame 201, which is fixedly installed on the top of a base 202. At least two universal wheels 203 are installed at the bottom of the base 202 to facilitate the movement of the device. There are four of them in the figure. A protective plate is installed at the middle and lower part of the frame 201. An oil cavity 3 for storing and containing fuel is installed on the rack 201. The oil cavity 3 is a cylindrical structure with a single-side opening. The opening of the oil cavity 3 faces downward. The middle part of the side wall of the oil cavity 3 is fixedly connected to the cross bar fixedly installed on the rack 201. The lower end of the oil cavity 3 is detachably connected to the outer ring of the rotary joint 1 to be tested through the adapter flange 11. The upper end of the side wall of the oil cavity 3 is provided with an oil inlet for filling and pressurizing oil from the outside. After filling oil into the oil cavity 3 from the oil inlet, the oil will flow from the opening on the lower side of the oil cavity 3 through the interior of the adapter flange 11 and then flow into the rotary joint 1. The three are internally connected. During the test, the oil inside the three is a whole. Therefore, the oil cavity pressure and oil cavity temperature of the oil cavity 3 are the oil pressure and oil temperature in the rotary joint 1. Mounted on the sidewalls of the oil chamber 3 are an accumulator 4 for stabilizing the oil chamber pressure, a thermometer 5 for measuring the oil chamber temperature, and a pressure gauge 6 for measuring the oil chamber pressure. The accumulator 4 stores gas at a constant pressure, which absorbs the energy of pipe expansion and contraction caused by temperature fluctuations. Therefore, the accumulator 4 effectively compensates for increases in oil chamber pressure caused by temperature drops, internal leakage, or external leakage. It also effectively controls increases in oil chamber pressure caused by temperature increases, achieving a balancing effect and ensuring stable operation of the device. An electrical control box 18 is fixedly installed on the left side of the rack 201. The electrical control box 18 is equipped with a power supply for all power components, a memory for storing data, and a main controller. A display screen is provided on the outer surface of the electrical control box 18. The main controller is connected to the thermometer 5, pressure gauge 6, torque sensor 7, photoelectric switch 13, motor 801, tension sensor 10 and display screen. The main controller can control the rotation speed of the motor 801; the display screen can display the collected data information, including the number of times the inner ring of the rotary joint 1 rotates alternately clockwise and counterclockwise around its central axis at a specific angle, the torque required for the inner ring of the rotary joint 1 to rotate, the tension exerted on the oil cavity 3, the oil cavity temperature and oil cavity pressure of the oil cavity 3. The electrical control box 18 also has fault detection and emergency functions. When the device is working, the main controller will monitor the thermometer 5, pressure gauge 6, torque sensor 7 and tension sensor 10 during the test. When the oil chamber temperature, oil chamber pressure, torque or tension value exceeds the preset threshold, the main controller will control the motor 801 to stop working and display an alarm message on the display screen to remind the staff to check.

[0036] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 、 Figure 12 As shown, the frame 201 is also equipped with a torque sensor 7 for measuring the torque of the inner ring of the rotary joint 1 to be tested, a driver 8 capable of driving the torque sensor 7, a length-adjustable connecting rod 9 for providing adjustable tension to the oil chamber 3, and a tension sensor 10 for measuring the tension applied by the connecting rod 9. Because the oil chamber 3 is connected to the rotary joint 1 to be tested via a flange, the tension applied to the oil chamber 3 can be considered as the tension applied to the rotary joint 1. A pull ring 14 is fixedly sleeved on the upper end of the oil chamber 3. The pull ring 14 is rotatably connected to the end of the connecting rod 9 away from the tension sensor 10. A T-shaped block 15 is rotatably mounted on the end of the tension sensor 10 away from the connecting rod 9. The T-shaped block 15 comprises a transverse portion and a vertical portion. The vertical portion is rotatably connected to the end of the tension sensor 10 away from the connecting rod 9. A limit post 16 is vertically mounted on the transverse portion near the right side wall of the frame 201. The right side wall is provided with multiple limit holes 17 from top to bottom for receiving the limit post 16. The connecting rod 9 includes a double-ended screw with positive and negative threads, and nuts are threadedly connected to the two threaded sections of the double-ended screw. One end of the double-ended screw is threadedly connected to the Y-shaped joint for connecting the pull ring 14, and the other end of the double-ended screw is threadedly connected to the cylindrical joint for connecting the tension sensor 10. The length of the connecting rod 9 can be adjusted by rotating the hexagonal knob in the middle of the double-ended screw.

[0037] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 10As shown, the torque sensor 7 is equipped with a photoelectric switch 13 capable of determining the position of the rotary joint 1 under test. The photoelectric switch 13 is controllably connected to the torque sensor 7, and a baffle is provided on the side of the torque sensor 7's input shaft. The output shaft of the torque sensor 7 is removably connected to the inner race of the rotary joint 1 under test via a shaft flange 12. The top of the shaft flange 12 features an oil inlet for the fuel flowing into the rotary joint 1, and the sidewall of the shaft flange 12 features an oil outlet, both of which are interconnected. By replacing the adapter flange 11 and shaft flange 12 of different sizes, the device can be adapted for rotary joints 1 of various sizes. The transmission member includes an eccentric wheel 802 fixedly mounted on the top of the output shaft of the motor 801. The eccentric wheel 802 includes a wheel body fixedly mounted vertically on the top of the output shaft of the motor 801 and an eccentric shaft fixedly mounted vertically on the side of the wheel body away from the output shaft of the motor 801. The eccentric shaft is rotatably connected to one end of the connecting rod 803. The end of the connecting rod 803 away from the eccentric shaft is rotatably connected to one end of the rocker 804. The end of the rocker 804 away from the connecting rod 803 is fixedly connected to the top of the input shaft of the torque sensor 7. A protective housing for protecting the motor 801 and the transmission member is installed on the frame 201 to ensure the safety of the staff. The transmission member can convert the rotational motion of the motor 801 into the reciprocating swinging motion of the rocker 804, thereby realizing the inner ring of the rotary joint 1 to alternately switch between clockwise and counterclockwise rotation at a specific rotation angle, truly simulating the movement of the rotary joint 1 during operation.

[0038] The working principle of the present invention is as follows: the device is moved to a suitable position via the universal wheel 203 , and then the universal wheel 203 is locked and fixed.

[0039] Select an adapter flange 11 and a rotating shaft flange 12 of appropriate sizes according to the size of the rotary joint 1 to be tested, detachably install the adapter flange 11 on the lower end of the oil cavity 3, and drively connect the rotating shaft flange 12 to the output shaft of the torque sensor 7. Drivenly connect the upper end of the outer ring of the rotary joint 1 to be tested to the end of the adapter flange 11 away from the oil cavity 3, and drively connect the lower end of the inner ring of the rotary joint 1 to be tested to the rotating shaft flange 12.

[0040] Open the oil inlet on the oil chamber 3 and the oil outlet of the rotating shaft flange 12, add fuel to the oil chamber 3 through the pipeline, and the fuel flows from the oil chamber 3 through the adapter flange 11 and then flows into the rotary joint 1. As the fuel is injected, air enters the oil inlet of the rotating shaft flange 12 and is discharged from the oil outlet, completing the oil filling and exhaust work. Then, use a pressure pump to pressurize the oil chamber 3, and observe the oil chamber pressure from the display screen. When the oil chamber pressure of the oil chamber 3 reaches the expected value, stop pressurizing and complete the pressurization work. Remove the limiting column 16 from the limiting hole 17 and insert it into the limiting holes 17 at different heights. When inserting, keep the horizontal part parallel to the right side wall, and the side of the horizontal part close to the right side wall close to the right side wall. The relative angle between the connecting rod 9 and the pull ring 14 will change, and the relative angle between the tension sensor 10 and the T-block 15 will also change, so as to adjust the pressure on the oil cavity 3. Observe the tension on the oil cavity 3 through the display screen until the value of the tension is consistent with the load state of the rotary joint 1 when it is working. Then, do not move the limiting column 16 anymore and insert it into the position hole 17 at this height.

[0041] Connect the power supply and start motor 801. Motor 801 rotates eccentric 802, which in turn drives connecting rod 803 via the eccentric shaft to perform planar compound motion. Rocker 804, acting as a follower, swings back and forth at varying speeds driven by connecting rod 803. This swinging motion drives the input shaft of torque sensor 7 to rotate alternately clockwise and counterclockwise around its central axis at a specific rotation angle. The output shaft of torque sensor 7 drives the inner ring of rotary joint 1 to rotate alternately clockwise and counterclockwise around its central axis at a specific rotation angle via shaft flange 12. While starting motor 801, record the time and observe in real time whether rotary joint 1 is leaking (sealing), whether it rotates smoothly and without unusual noises (i.e., operating status), and whether it is leaking when rotary joint 1 reaches its estimated lifespan (lifespan). Leakage can be determined by the oil chamber pressure. During the test, relevant data such as the oil chamber pressure, oil chamber temperature, motor speed, torque required for inner ring rotation, and tension applied to the oil chamber 3 are recorded and stored in memory, providing basic data for subsequent reliability analysis. After the test is completed, the power is turned off, and all fuel is drained from the oil outlet of the shaft flange 12. The rotary joint 1 is disassembled, and the adapter flange 11 and shaft flange 12 are removed, cleaned, and stored for future use.

[0042] It should be noted that the present invention is not limited to the specific structures shown in the drawings in the above embodiments, and various changes can be made thereto within the scope of knowledge possessed by ordinary technicians in this field.

Claims

1. A reliability test device for a special rotary joint for aircraft refueling hard pipe, characterized in that: It comprises a rack (201), on which an oil cavity (3) for storing and containing fuel is mounted, and the lower end of the oil cavity (3) is detachably connected to the outer ring of the rotary joint (1) to be tested; The oil cavity (3) is a cylindrical structure with a single-side opening, the opening of the oil cavity (3) faces downward, and an energy accumulator (4) for stabilizing the oil cavity pressure of the oil cavity (3), a thermometer (5) for measuring the oil cavity temperature of the oil cavity (3), and a pressure gauge (6) for measuring the oil cavity pressure of the oil cavity (3) are installed on the side wall of the oil cavity (3); The frame (201) is also provided with a torque sensor (7) for measuring the torque of the inner ring of the rotary joint (1) to be tested, a driving member (8) capable of driving the input shaft of the torque sensor (7) to rotate alternately clockwise and counterclockwise, a length-adjustable connecting rod (9) for providing an adjustable tension to the oil chamber (3), and a tension sensor (10) for measuring the tension provided by the connecting rod (9); The output shaft of the torque sensor (7) is detachably connected to the inner ring of the rotary joint (1) to be tested, and the connecting rod (9) is rotationally connected to the tension sensor (10).

2. The reliability test device for a special rotary joint for aircraft refueling hard pipe according to claim 1 is characterized in that: The frame (201) is fixedly mounted on the top of the base (202), and at least two universal wheels (203) are mounted on the bottom of the base (202).

3. The reliability test device for a special rotary joint for aircraft refueling hard pipe according to claim 1 is characterized in that: The lower end of the oil cavity (3) is detachably connected to the outer ring of the rotary joint (1) to be tested via a connecting flange (11); The output shaft of the torque sensor (7) is detachably connected to the inner ring of the rotary joint (1) to be tested via a rotating shaft flange (12).

4. A reliability test device for a special rotary joint for an aircraft refueling pipe according to any one of claims 1 to 3, characterized in that: A photoelectric switch (13) capable of measuring the position of the rotary joint (1) to be tested is installed on the torque sensor (7), and the photoelectric switch (13) is control-connected to the torque sensor (7).

5. A reliability test device for a special rotary joint for an aircraft refueling pipe according to any one of claims 1 to 3, characterized in that: A pull ring (14) is fixedly sleeved on the outer end of the oil cavity body (3), and the pull ring (14) is rotatably connected to the end of the connecting rod (9) away from the tension sensor (10). The end of the tension sensor (10) away from the connecting rod (9) is rotatably installed with a T-shaped block (15), and the T-shaped block (15) includes a horizontal portion and a vertical portion, and the vertical portion is rotatably connected to the end of the tension sensor (10) away from the connecting rod (9). A limiting column (16) is vertically installed on a surface of the horizontal portion close to the right side wall of the shelf (201), and a plurality of limiting holes (17) for inserting the limiting column (16) are opened from top to bottom on the right side wall.

6. A reliability test device for a special rotary joint for an aircraft refueling pipe according to any one of claims 1 to 3, characterized in that: The driving member (8) includes a motor (801) and a transmission member in transmission connection with the torque sensor (7); The transmission member includes an eccentric wheel (802) fixedly mounted on the top end of the output shaft of the motor (801), the eccentric wheel (802) includes a wheel body fixedly mounted vertically on the top end of the output shaft of the motor (801) and an eccentric shaft fixedly mounted vertically on a side of the wheel body away from the output shaft of the motor (801), the eccentric shaft is rotatably connected to one end of a connecting rod (803), the end of the connecting rod (803) away from the eccentric shaft is rotatably connected to one end of a rocker (804), and the end of the rocker (804) away from the connecting rod (803) is fixedly connected to the top end of the input shaft of the torque sensor (7).

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