Aircraft hydraulic pipeline butt joint device and using method

Abstract

The invention belongs to the field of aircraft structure design, and relates to an aircraft hydraulic pipeline butt joint device and a using method, the device comprises a hydraulic pipe fixing device and a hydraulic pipe connecting device, when the hydraulic pipe fixing device and the hydraulic pipe connecting device are connected, oil ways in the hydraulic pipe fixing device and the hydraulic pipe connecting device are automatically communicated, oil liquid transmission is achieved, and the hydraulic pipe fixing device is connected with the hydraulic pipe connecting device. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are disconnected, the hydraulic pipe fixing device and the hydraulic pipe connecting device are self-sealed, and oil leakage is avoided. The problem of butt joint of hydraulic pipelines in a limited space can be quickly solved, a large number of maintenance covering caps are prevented from being additionally arranged on a machine body structure, and the weight of the machine body structure is reduced; meanwhile, the influence of arrangement of a large number of covering caps on surface flatness is reduced, and aerodynamic performance of an airplane is facilitated. Meanwhile, after the device is in butt joint, related valves do not need to be operated and opened any more, butt-joint pipelines are connected when butt joint is completed, and operation is gradually changed; moreover, after the oil liquid transmission is completed, when the butt joint device is disassembled, due to the fact that the butt joint device has a self-sealing function, the oil liquid left in the butt joint device cannot leak.

Description

Technical Field

[0001] This invention belongs to the field of aircraft structural design and relates to an aircraft hydraulic pipeline docking device and its usage method. Background Technology

[0002] Aircraft hydraulic lines are the "blood vessels" of the hydraulic system, permeating the entire airframe structure. They are responsible for safely and efficiently delivering hydraulic oil from the power source to various aircraft actuators, such as the control system, landing gear retraction system, and door operating system. For the connection and maintenance of hydraulic lines, numerous caps have been added to the surface of the airframe structure. Some of these caps severely impact the optimal force transmission path of the aircraft structure, thus increasing its weight. Furthermore, the large number of caps affects surface flatness, negatively impacting the aircraft's aerodynamic performance. Therefore, designing a hydraulic line connection joint that is suitable for docking in confined spaces and is convenient and reliable is crucial. Currently, however, the process is cumbersome; valves must be opened after the lines are connected to allow the hydraulic fluid to flow. Moreover, after the fluid transfer is complete, the valves must be closed before disconnecting the lines, and residual fluid in the lines can leak during disassembly. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of the current system where, after connecting pipelines, the relevant valves must be opened to connect the oil in the connected pipelines, which is cumbersome; moreover, after the oil transfer is completed, the relevant valves must be closed before the connected pipelines are disassembled; and the residual oil in the pipelines will leak when the connected pipelines are disassembled. This invention proposes an aircraft hydraulic pipeline connection device and its usage method.

[0004] Technical content An aircraft hydraulic pipeline docking device includes a hydraulic pipe fixing device and a hydraulic pipe connecting device. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are connected, the oil circuits inside the hydraulic pipe fixing device and the hydraulic pipe connecting device are automatically connected to realize oil transmission. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are disconnected, the hydraulic pipe fixing device and the hydraulic pipe connecting device achieve self-sealing to prevent oil leakage.

[0005] Furthermore, the hydraulic pipe fixing device includes a fixing joint housing. The first end of the fixing joint housing is used to connect to the hydraulic pipeline, and the second end of the fixing joint housing is used to connect to the hydraulic pipe connecting device. An oil passage plate is provided inside the first end of the fixing joint housing. A mating hole is provided in the middle of the oil passage plate, and an oil passage hole is provided at the edge of the mating hole. A flow limiting rod is provided inside the fixing joint housing, and the first end of the flow limiting rod is provided in the mating hole and is clearance-fitted with the mating hole. The second end of the flow limiting rod is provided with a tapered end, which is fitted with the oil passage channel of the fixing joint housing. A flow limiting spring is sleeved on the flow limiting rod. One end of the flow limiting spring contacts the end face of the oil passage plate, and the other end contacts the end face of the tapered end of the flow limiting rod. A plurality of limiting holes D are provided on the outer cylindrical surface of the first end of the fixing joint housing. A steel ball is provided on the limiting hole D, and the steel ball is clearance-fitted with the limiting hole D.

[0006] Furthermore, a snap-fit ​​spring and a sliding snap-fit ​​are provided on the outer side of the second end of the fixed connector housing. When the sliding snap-fit ​​spring is pressed, the connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device can be released. Under the action of the snap-fit ​​spring, the sliding snap-fit ​​presses the steel ball into the limiting hole D and the slot F provided on the outer side of the connecting connector housing, thereby realizing the fixed connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device.

[0007] Furthermore, the hydraulic pipe connection device includes a connecting joint housing. The first end of the connecting joint housing extends into the first end of the fixed joint housing. The second end of the connecting joint housing is used to connect to the hydraulic pipeline. An oil passage plate II is provided in the second end of the connecting joint housing. A mating hole II is provided in the middle of the oil passage plate II. An oil passage hole is provided at the edge of the mating hole II. A flow limiting rod II is provided inside the connecting joint housing. The first end of the flow limiting rod II is provided in the mating hole II and is clearance-fitted with the mating hole II. The second end of the flow limiting rod II is provided with a tapered end, which is mated with the oil passage hole of the connecting joint housing. The tapered end of the flow limiting rod II is opposite to the tapered end of the flow limiting rod I. A flow limiting spring II is sleeved on the flow limiting rod II. One end of the flow limiting spring II contacts the end face of the oil passage plate II, and the other end contacts the end face of the tapered end of the flow limiting rod II.

[0008] Furthermore, a limiting washer is provided inside the first end of the fixed connector housing, and the limiting washer limits the oil pan; a limiting washer is provided inside the first end of the connecting connector housing, and the limiting washer limits the oil pan.

[0009] Furthermore, a rubber sealing ring is provided at the conical end of the flow limiting rod one to seal the oil passage inside the fixed joint housing; a rubber sealing ring is provided at the conical end of the flow limiting rod two to seal the oil passage inside the connecting joint housing.

[0010] Furthermore, a rubber sealing ring is provided on the connecting end face between the second end of the fixed connector housing and the second end of the connecting connector housing.

[0011] Furthermore, a snap-fit ​​limiting ring is provided on the outer side of the second end of the fixed connector housing to limit the sliding snap-fit.

[0012] A method of using the aforementioned aircraft hydraulic line connection device includes the following steps: Step 1. Select matching hydraulic pipe fixing device and hydraulic pipe connecting device, and connect the hydraulic pipe fixing device, hydraulic pipe connecting device and hydraulic pipeline respectively; In the initial state, the flow limiting spring 1 in the fixed joint housing provides spring force to the flow limiting rod 1, and the conical end of the flow limiting rod 1 is in contact with the inner wall of the oil passage in the fixed joint housing to seal and prevent oil from flowing out of the fixed joint housing; The flow limiting spring 2 in the connecting joint housing provides spring force to the flow limiting rod 2, and the conical end of the flow limiting rod 2 contacts the inner wall of the oil passage in the connecting joint housing to prevent oil from flowing out of the connecting joint housing; Step 2. When connecting the hydraulic lines, move the sliding buckle to compress the buckle spring. At this time, the steel ball is squeezed by the sliding buckle and completely enters the limiting hole D, and the inner side of the steel ball protrudes out of the inner wall of the fixed joint housing. Step 3. Insert the connecting connector housing into the fixed connector housing. During the insertion process, the front end of the connecting connector housing squeezes the steel ball, causing the steel ball to move outward within the limiting hole D until the inner side of the steel ball no longer protrudes from the inner wall of the fixed connector housing. The connecting connector housing is then smoothly inserted into the fixed connector housing. Step 4: The conical end of the flow-limiting rod 2 is pressed tightly against the oil passage of the connecting joint housing. As the connecting joint housing continues to penetrate deeper into the fixed joint housing, the conical end of the flow-limiting rod 1 contacts the conical end of the flow-limiting rod 2 and they press against each other. The flow-limiting spring 1 and the flow-limiting spring 2 are compressed simultaneously until the connecting joint housing contacts the groove surface of the fixed joint housing. At this time, the flow-limiting rod 1 separates from the inner wall of the oil passage of the fixed joint housing, and the flow-limiting rod 2 separates from the inner wall of the oil passage of the connecting joint housing. The oil flow passage is opened, and the oil enters the connecting joint housing through the oil pan 2, and then flows into the fixed joint and enters the aircraft hydraulic pipeline through the oil pan 1. Step 5. Release the sliding buckle, the buckle spring returns to its original state, move the sliding buckle to squeeze the steel ball. At this time, the outer part of the steel ball remains in the limiting hole D, and the inner part is pressed into the slot F of the connecting joint housing. The buckle limiting ring keeps the moving buckle outside the limiting hole D, so that the steel ball is completely restricted, thereby locking the connecting joint housing and the fixed joint housing and preventing the fixed joint housing from separating from the connecting joint housing during oil transportation. Step 6. After the oil transfer is completed, when it is necessary to disconnect, move the sliding buckle and compress the buckle spring until the steel ball can be fully inserted from the slot F into the limiting hole D, thus releasing the locking state; the connecting joint housing is removed from the fixed joint housing, the flow limiting spring one and the flow limiting spring two return to their original state, and the conical end of the flow limiting rod two contacts the inner wall of the oil passage of the connecting joint housing again, thus blocking the oil flow channel and preventing oil leakage, completing the entire process of connecting the aircraft hydraulic pipeline.

[0013] Beneficial effects The present invention proposes an aircraft hydraulic pipeline docking device, which can quickly solve the problem of hydraulic pipeline docking in a limited space, avoid adding a large number of maintenance covers to the airframe structure, and reduce the weight of the airframe structure itself; at the same time, reducing the impact of a large number of covers on surface flatness is beneficial to the aerodynamic performance of the aircraft.

[0014] Meanwhile, after docking, the device of the present invention does not require the opening of related valves. The docking pipeline is connected at the moment of docking completion, and the operation is gradual. Moreover, after the oil transfer is completed, when disassembling the docking device of the present invention, the oil left in the docking device will not leak due to its self-sealing function. Attached Figure Description

[0015] Figure 1 This is an exploded view of the hydraulic pipe fixing device.

[0016] Figure 2 This is an assembly drawing of a hydraulic pipe fixing device.

[0017] Figure 3 This is a cross-sectional view of the hydraulic pipe fixing device.

[0018] Figure 4 This is an exploded view of the hydraulic pipe connection device.

[0019] Figure 5 This is an assembly drawing of a hydraulic pipe connection device.

[0020] Figure 6 This is a cross-sectional view of the hydraulic pipe connection device.

[0021] Figure 7 It is an assembly diagram of the aircraft hydraulic pipeline docking device.

[0022] Figure 8 This is a cross-sectional view of the aircraft hydraulic pipeline connection joint.

[0023] In the diagram: 1-Fixed connector housing; 2-Sliding buckle; 3-Flow limiting rod one; 4-Oil pan one; 5-Limiting washer one; 6-Flow limiting spring one; 7-Rubber sealing ring one; 8-Rubber sealing ring; 9-Snap spring; 10-Steel ball; 11-Snap limiting ring; 12-Connecting connector housing; 13-Flow limiting rod two; 14-Flow limiting spring two; 15-Limiting washer two; 16-Oil pan two; 17-Rubber sealing ring two; 18-Steel ball. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings: refer to Figure 1-8One embodiment of the present invention provides an aircraft hydraulic pipeline docking device, including a hydraulic pipe fixing device and a hydraulic pipe connecting device. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are connected, the oil circuits inside the hydraulic pipe fixing device and the hydraulic pipe connecting device are automatically connected to realize oil transmission. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are disconnected, the hydraulic pipe fixing device and the hydraulic pipe connecting device achieve self-sealing to prevent oil leakage.

[0025] In this embodiment, the hydraulic pipe fixing device includes a fixing connector housing 1. The first end of the fixing connector housing 1 is used to connect to the hydraulic pipeline, and the second end of the fixing connector housing 1 is used to connect to the hydraulic pipe connecting device. An oil passage plate 4 is provided inside the first end of the fixing connector housing 1. A mating hole 1 is provided in the middle of the oil passage plate 4, and an oil passage hole is provided at the edge of the mating hole 1. A flow limiting rod 3 is provided inside the fixing connector housing 1, and the first end of the flow limiting rod 3 is provided in the mating hole 1 and is clearance-fitted with the mating hole 1. The second end of the flow limiting rod 3 is provided with a tapered end, which is fitted with the oil passage of the fixing connector housing 1. A flow limiting spring 6 is sleeved on the flow limiting rod 3. One end of the flow limiting spring 6 contacts the end face of the oil passage plate 4, and the other end contacts the end face of the tapered end of the flow limiting rod 3. A plurality of limiting holes D are provided on the outer cylindrical surface of the first end of the fixing connector housing 1. A steel ball 18 is provided on the limiting hole D and is clearance-fitted with the limiting hole D.

[0026] In this embodiment, a snap spring 9 and a sliding snap 2 are provided on the outside of the second end of the fixed connector housing 1. When the sliding snap 2 presses the snap spring 9, the connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device can be released. Under the action of the snap spring 9, the sliding snap 2 presses the steel ball 18 into the limiting hole D and the slot F provided on the outside of the connecting connector housing 12, thereby realizing the fixed connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device.

[0027] In this embodiment, the hydraulic pipe connection device includes a connecting joint housing 12. The first end of the connecting joint housing 12 extends into the first end of the fixed joint housing 1. The second end of the connecting joint housing 12 is used to connect to the hydraulic pipeline. An oil passage plate 16 is provided in the second end of the connecting joint housing 12. A mating hole 2 is provided in the middle of the oil passage plate 16. An oil passage hole is provided at the edge of the mating hole 2. A flow limiting rod 13 is provided inside the connecting joint housing 12. The first end of the flow limiting rod 13 is provided in the mating hole 2 and is clearance-fitted with the mating hole 2. The second end of the flow limiting rod 13 is provided with a tapered end, which is mated with the oil passage of the connecting joint housing 12. The tapered end of the flow limiting rod 13 is opposite to the tapered end of the flow limiting rod 3. A flow limiting spring 14 is sleeved on the flow limiting rod 13. One end of the flow limiting spring 14 contacts the end face of the oil passage plate 16, and the other end contacts the end face of the tapered end of the flow limiting rod 13.

[0028] In this embodiment, a limiting washer 5 is provided inside the first end of the fixed connector housing 1, and the limiting washer 5 limits the oil pan 4; a limiting washer 15 is provided inside the first end of the connecting connector housing 12, and the limiting washer 15 limits the oil pan 16.

[0029] In this embodiment, the tapered end of the flow limiting rod 13 is provided with a rubber sealing ring 7 to seal the oil passage inside the fixed connector housing 1; the tapered end of the flow limiting rod 23 is provided with a rubber sealing ring 17 to seal the oil passage inside the connecting connector housing 12.

[0030] In this embodiment, a rubber sealing ring 8 is provided on the connection end face between the second end of the fixed connector housing 1 and the second end of the connecting connector housing 12 for sealing. In this embodiment, a snap-fit ​​limiting ring 11 is provided on the outside of the second end of the fixed connector housing 1 to limit the sliding snap-fit ​​2.

[0031] Hydraulic pipe fixing device such as Figure 1 As shown, it consists of 11 parts. The assembly steps are as follows: 1. Install the rubber sealing ring 7 at the slot E of the flow limiting rod 3, and put the flow limiting spring 6 on the flow limiting rod 3. Then install the flow limiting rod 3 into the housing 1 of the fixed connector. 2. Install the oil pan 4 on the top of the flow limiting rod 3, and at the same time, embed the limiting washer 5 into the limiting groove A of the fixed connector housing 1; 3. Press the rubber sealing ring 8 into the limiting groove B of the fixed joint housing 1, put the snap spring 9 on the fixed joint housing 1, and place the 6 steel balls 10 in the limiting groove D (limiting hole D) of the fixed joint housing 1; 4. Place the sliding buckle 2 onto the fixed connector housing 1, and install the buckle limiting ring 11 into the limiting groove C of the fixed connector housing 1.

[0032] The assembly drawing of the hydraulic pipe fixing joint after assembly is as follows: Figure 2 As shown, the cross-sectional view is as follows Figure 3 As shown.

[0033] Hydraulic pipe connection device such as Figure 4 As shown, it consists of 6 parts. The assembly steps are as follows: 1. Install the rubber sealing ring 26 at the slot G of the flow limiting rod 2, and put the flow limiting spring 23 on the flow limiting rod 2. Then install the flow limiting rod 2 into the housing 1 of the connecting joint. 2. Install the oil pan 25 on the top of the flow limiting rod 2, and at the same time, embed the limiting washer 24 into the limiting groove H of the connecting joint housing 1.

[0034] The assembly diagram of the hydraulic pipe connection joint after assembly is as follows: Figure 5 As shown, the cross-sectional view is as follows Figure 6 As shown.

[0035] A second embodiment of the present invention provides a method for using the aforementioned aircraft hydraulic pipeline docking device, comprising the following steps: Step 1. Select matching hydraulic pipe fixing devices and hydraulic pipe connecting devices, and connect the hydraulic pipe fixing devices, hydraulic pipe connecting devices, and hydraulic pipes respectively; In the initial state, the flow-limiting spring 6 inside the fixed joint housing 1 provides spring force to the flow-limiting rod 3, and the conical end of the flow-limiting rod 3 is sealed against the inner wall of the oil passage inside the fixed joint housing 1 to prevent oil from flowing out of the fixed joint housing 1; The flow-limiting spring 14 inside the connecting joint housing 12 provides spring force to the flow-limiting rod 13, and the conical end of the flow-limiting rod 13 contacts the inner wall of the oil passage in the connecting joint housing 12 to prevent oil from flowing out of the connecting joint housing 12; Step 2. When the hydraulic lines are connected, move the sliding buckle 2 to compress the buckle spring 9. At this time, the steel ball 18 is squeezed by the sliding buckle 2 and completely enters the limiting hole D, and the inner side of the steel ball 18 protrudes out of the inner wall of the fixed joint housing. Step 3. Insert the connecting connector housing 12 into the fixing connector housing 1. During the insertion process, the front end of the connecting connector housing 12 squeezes the steel ball, causing the steel ball 18 to move outward in the limiting hole D until the inner side of the steel ball 18 no longer protrudes from the inner wall of the fixing connector housing 1. The connecting connector housing 12 is then smoothly inserted into the fixing connector housing 1. Step 4: The conical end of the flow-limiting rod 13 is pressed against the oil passage of the connecting joint housing 12. As the connecting joint housing 12 continues to penetrate deeper into the fixed joint housing 1, the conical end of the flow-limiting rod 13 contacts and squeezes against the conical end of the flow-limiting rod 13. The flow-limiting spring 16 and the flow-limiting spring 14 are compressed simultaneously until the connecting joint housing 12 contacts the groove surface of the fixed joint housing 1. At this time, the flow-limiting rod 13 separates from the inner wall of the oil passage of the fixed joint housing 12, and the flow-limiting rod 13 separates from the inner wall of the oil passage of the connecting joint housing 12. The oil flow channel is opened, and the oil enters the connecting joint housing 12 through the oil pan 16, then flows into the fixed joint, and enters the aircraft hydraulic pipeline through the oil pan 4. Step 5. Release the sliding buckle 2, the buckle spring 9 returns to its original state, move the sliding buckle 2 to squeeze the steel ball 18. At this time, the outer part of the steel ball 18 remains in the limiting hole D, and the inner part is pressed into the slot F of the connecting joint housing 12. The buckle limiting ring 11 keeps the moving buckle 2 outside the limiting hole D, so that the steel ball 18 is completely restricted, thereby locking the connecting joint housing 12 and the fixed joint housing 1, preventing the fixed joint housing 1 from separating from the connecting joint housing 12 during the oil transportation process. Step 6. After the oil transfer is completed, when it is necessary to disconnect, move the sliding buckle 2 and compress the buckle spring 9 until the steel ball 18 can be fully inserted from the slot F into the limiting hole D, thus releasing the locking state; the connecting joint housing 12 is removed from the fixed joint housing 1, the flow limiting spring 16 and the flow limiting spring 24 return to their original state, and the conical end of the flow limiting rod 2 13 re-contacts the inner wall of the oil passage of the connecting joint housing 12, thus blocking the oil flow channel and preventing oil leakage, completing the entire process of connecting the aircraft hydraulic pipeline.

Claims

1. An aircraft hydraulic pipeline docking device, characterized in that, It includes a hydraulic pipe fixing device and a hydraulic pipe connecting device. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are connected, the oil circuit inside the hydraulic pipe fixing device and the hydraulic pipe connecting device are automatically connected to realize oil transmission. When the hydraulic pipe fixing device and the hydraulic pipe connecting device are disconnected, the hydraulic pipe fixing device and the hydraulic pipe connecting device achieve self-sealing to prevent oil leakage.

2. The aircraft hydraulic pipeline docking device according to claim 1, characterized in that, The hydraulic pipe fixing device includes a fixing joint housing. The first end of the fixing joint housing is used to connect to the hydraulic pipeline, and the second end is used to connect to the hydraulic pipe connecting device. An oil passage plate is provided inside the first end of the fixing joint housing. A mating hole is provided in the center of the oil passage plate, and an oil passage hole is provided at the edge of the mating hole. A flow-limiting rod is disposed inside the fixing joint housing, with its first end positioned in the mating hole and clearance-fitted with it. The second end of the flow-limiting rod has a tapered end that mates with the oil passage channel of the fixing joint housing. A flow-limiting spring is sleeved on the flow-limiting rod, with one end contacting the end face of the oil passage plate and the other end contacting the tapered end face of the flow-limiting rod. Several limiting holes D are provided on the outer cylindrical surface of the first end of the fixing joint housing, and steel balls are placed on the limiting holes D, with clearance-fitted steel balls to the limiting holes D.

3. The aircraft hydraulic pipeline docking device according to claim 2, characterized in that, The second end of the fixed connector housing is equipped with a snap spring and a sliding snap. When the sliding snap presses the snap spring, it can release the connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device. Under the action of the snap spring, the sliding snap presses the steel ball into the limiting hole D and the slot F provided on the outside of the connector housing, thereby realizing the fixed connection between the hydraulic pipe fixing device and the hydraulic pipe connecting device.

4. The aircraft hydraulic pipeline docking device according to claim 3, characterized in that, The hydraulic pipe connection device includes a connecting joint housing. The first end of the connecting joint housing extends into the first end of the fixed joint housing. The second end of the connecting joint housing is used to connect to the hydraulic pipeline. An oil passage plate is provided in the second end of the connecting joint housing. A mating hole is provided in the middle of the oil passage plate, and an oil passage hole is provided at the edge of the mating hole. A flow limiting rod is provided inside the connecting joint housing, and the first end of the flow limiting rod is provided in the mating hole and is clearance-fitted with the mating hole. The second end of the flow limiting rod is provided with a tapered end, which is mated with the oil passage of the connecting joint housing. The tapered end of the flow limiting rod is opposite to the tapered end of the flow limiting rod. A flow limiting spring is sleeved on the flow limiting rod. One end of the flow limiting spring contacts the end face of the oil passage plate, and the other end contacts the end face of the tapered end of the flow limiting rod.

5. The aircraft hydraulic pipeline docking device according to claim 4, characterized in that, The first end of the fixed connector housing is provided with a limiting washer, which limits the oil pan; the first end of the connecting connector housing is provided with a limiting washer, which limits the oil pan.

6. The aircraft hydraulic pipeline docking device according to claim 5, characterized in that, The first conical end of the flow limiting rod is equipped with a rubber sealing ring to seal the oil passage inside the housing of the fixed joint; the second conical end of the flow limiting rod is equipped with a rubber sealing ring to seal the oil passage inside the housing of the connecting joint.

7. The aircraft hydraulic pipeline docking device according to claim 6, characterized in that, A rubber sealing ring is provided on the connection end face between the second end of the fixed connector housing and the second end of the connecting connector housing.

8. The aircraft hydraulic pipeline docking device according to claim 7, characterized in that, A snap-fit ​​limiting ring is provided on the outer side of the second end of the fixed connector housing to limit the sliding snap-fit.

9. A method of using the aircraft hydraulic pipeline docking device as described in claim 8, characterized in that, Includes the following steps: Step 1. Select matching hydraulic pipe fixing device and hydraulic pipe connecting device, and connect the hydraulic pipe fixing device, hydraulic pipe connecting device and hydraulic pipeline respectively; In the initial state, the flow limiting spring 1 in the fixed joint housing provides spring force to the flow limiting rod 1, and the conical end of the flow limiting rod 1 is in contact with the inner wall of the oil passage in the fixed joint housing to seal and prevent oil from flowing out of the fixed joint housing; The flow limiting spring 2 in the connecting joint housing provides spring force to the flow limiting rod 2, and the conical end of the flow limiting rod 2 contacts the inner wall of the oil passage in the connecting joint housing to prevent oil from flowing out of the connecting joint housing; Step 2. When connecting the hydraulic lines, move the sliding buckle to compress the buckle spring. At this time, the steel ball is squeezed by the sliding buckle and completely enters the limiting hole D, and the inner side of the steel ball protrudes out of the inner wall of the fixed joint housing. Step 3. Insert the connecting connector housing into the fixed connector housing. During the insertion process, the front end of the connecting connector housing squeezes the steel ball, causing the steel ball to move outward within the limiting hole D until the inner side of the steel ball no longer protrudes from the inner wall of the fixed connector housing. The connecting connector housing is then smoothly inserted into the fixed connector housing. Step 4: The conical end of the flow-limiting rod 2 is pressed tightly against the oil passage of the connecting joint housing. As the connecting joint housing continues to penetrate deeper into the fixed joint housing, the conical end of the flow-limiting rod 1 contacts the conical end of the flow-limiting rod 2 and they press against each other. The flow-limiting spring 1 and the flow-limiting spring 2 are compressed simultaneously until the connecting joint housing contacts the groove surface of the fixed joint housing. At this time, the flow-limiting rod 1 separates from the inner wall of the oil passage of the fixed joint housing, and the flow-limiting rod 2 separates from the inner wall of the oil passage of the connecting joint housing. The oil flow passage is opened, and the oil enters the connecting joint housing through the oil pan 2, and then flows into the fixed joint and enters the aircraft hydraulic pipeline through the oil pan 1. Step 5. Release the sliding buckle, the buckle spring returns to its original state, move the sliding buckle to squeeze the steel ball. At this time, the outer part of the steel ball remains in the limiting hole D, and the inner part is pressed into the slot F of the connecting joint housing. The buckle limiting ring keeps the moving buckle outside the limiting hole D, so that the steel ball is completely restricted, thereby locking the connecting joint housing and the fixed joint housing and preventing the fixed joint housing from separating from the connecting joint housing during the oil transportation process. Step 6. After the oil transfer is completed, when it is necessary to disconnect, move the sliding buckle and compress the buckle spring until the steel ball can be fully inserted from the slot F into the limiting hole D, thus releasing the locking state; the connecting joint housing is removed from the fixed joint housing, the flow limiting spring one and the flow limiting spring two return to their original state, and the conical end of the flow limiting rod two contacts the inner wall of the oil passage of the connecting joint housing again, thus blocking the oil flow channel and preventing oil leakage, completing the entire process of connecting the aircraft hydraulic pipeline.

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