Sealing performance testing device and method for high-overload-resistant steering engine executing mechanism

Abstract

The invention relates to a sealing performance testing device and method for a high-overload-resistant steering engine actuating mechanism, belongs to the technical field of sealing performance detection of steering engines, and solves the technical problem that in the detection process in the prior art, subarea detection cannot be carried out, and which area of the steering engine actuating mechanism is unqualified in pre-encapsulation cannot be determined. The device comprises a test cabin, an inflation part and a detection part, the test cabin comprises a sealing ring and a telescopic rod, the sealing ring and the telescopic rod divide the test cabin into a first sub-test cabin, a second sub-test cabin and a third sub-test cabin for inflation, and the sealing performance detection of the upper sealing ring, the hollow flow channel and the motor sub-region of the to-be-detected piece is completed. According to the invention, whether the to-be-detected piece is a pre-encapsulation qualified piece or not can be determined, and which part of the to-be-detected piece with unqualified pre-encapsulation is unqualified in pre-encapsulation can be further determined.

Description

Technical Field

[0001] The present invention relates to the technical field of servo seal detection, and particularly to a sealing performance testing device for a high-overload servo actuator. Background Art

[0002] Currently, during the design process of high-overload servos, in addition to adopting measures such as high-overload structures and high-overload critical components, the most important means is to take local sealing of the servo actuator and overall potting of the aircraft, so as to achieve the purpose of effectively absorbing energy and reducing the impact of structural deformation on the product.

[0003] When the aircraft is hermetically sealed as a whole, in order to ensure that the potting adhesive fills the entire cabin, the vacuum potting method is mainly used. The aircraft is placed in a vacuum chamber, and the air inside the chamber is evacuated. As the air inside the chamber decreases, the air pressure inside the chamber also decreases. At this time, the potting adhesive flows into the aircraft under the action of air pressure, and all the gaps inside the aircraft will be filled with the potting adhesive due to the effect of vacuum.

[0004] The structure layout of the servo actuator is complex. The special-shaped frame has the characteristics of multiple channels and multiple gaps, and there are many parts and components among them. The potting adhesive has low viscosity and strong fluidity, which is extremely easy to cause the adhesive to penetrate into the actuator internally, seriously affecting the operation of the servo actuator and even resulting in transmission jamming faults of the servo actuator. Before the overall potting of the aircraft, it is often necessary to perform pre-potting treatment on multiple positions such as the internal channels and gaps of the actuator, so that the actuator can resist the intrusion of external colloid into the transmission part under the overall potting environment of the aircraft. The overall potting of the aircraft does not have reverse operability. Therefore, it is particularly important to verify the sealing performance and reliability of the pre-potted position of the actuator before the overall potting.

[0005] Therefore, how to provide a testing device that can detect the sealing performance of the pre-potted high-overload servo actuator, can detect the overall sealing performance of the servo actuator, and further determine which component of the servo actuator has unqualified pre-potting is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0006] In view of the above analysis, an embodiment of the present invention aims to provide a sealing performance testing device for a high-overload servo actuator, which is used to detect the sealing performance of the pre-potted high-overload servo actuator, and during the sealing performance detection, determine which component of the servo actuator has unqualified pre-potting treatment, and quickly re-pot the unqualified component.

[0007] The present invention provides a sealing performance testing device for a high-overload servo actuator, which includes a test chamber, an inflation member, and a detection member; the inflation member fills the test chamber with a detection gas; the detection member is used to detect the gas pressure value inside the test chamber; The test chamber includes a sealing ring and a telescopic rod; the sealing ring includes an encircling airbag, and the inflating member inflates the encircling airbag. The encircling airbag encircles the upper sealing ring of the component to be tested, forming a first sub-test chamber for sealing detection of the upper sealing ring. The telescopic rod includes a first plugging airbag. The telescopic rod extends into the hollow flow channel of the component to be tested, and the inflating member inflates the first plugging airbag. The first plugging airbag plugs the hollow flow channel, forming a second sub-test chamber for sealing detection of the hollow flow channel of the component to be tested. Wherein, the inflating member inflates the first sub-test chamber and the second sub-test chamber, and the detecting member detects the sealing performance of the upper sealing ring and the hollow flow channel of the component to be tested.

[0008] Further, the test chamber further includes a cavity with one end open. The sealing ring is arranged at the open end of the cavity, and the telescopic rod is arranged inside the cavity. When the encircling airbag encircles the upper sealing ring of the component to be tested and the first plugging airbag plugs the hollow flow channel, a third sub-test chamber is formed between the first plugging airbag and the first plugging airbag. The third sub-test chamber is used for sealing detection of the motor of the component to be tested.

[0009] Further, the encircling airbag includes a first inflatable cavity, a second inflatable cavity and a third inflatable cavity. The inflating member inflates the first inflatable cavity, and the first acting end of the first inflatable cavity expands downward and presses the upper end face of the frame of the component to be tested. The inflating member inflates the second inflatable cavity, and the second acting end of the second inflatable cavity expands toward the upper sealing ring and presses the upper sealing ring. The inflating member inflates the third inflatable cavity, and the third acting end of the third inflatable cavity expands toward the outer wall of the frame of the component to be tested and presses the outer wall of the frame of the component to be tested.

[0010] Further, the first sub-test chamber includes an upper test chamber and a lower test chamber. When the first inflatable cavity and the second inflatable cavity are inflated, the first inflatable cavity and the second inflatable cavity form the upper test chamber. When the second inflatable cavity and the third inflatable cavity are inflated, the lower test chamber is formed between the second inflatable cavity and the third inflatable cavity.

[0011] Further, a first shape memory alloy is arranged on the inner wall of the first acting end; a second shape memory alloy is arranged on the inner wall of the second acting end; a third shape memory alloy is arranged on the inner wall of the third acting end.

[0012] Further, a first air outlet valve is arranged on the upper test chamber; a second air outlet valve is arranged on the lower test chamber; a third air outlet valve is arranged on the second sub-test chamber; a fourth air outlet valve is arranged on the third sub-test chamber.

[0013] Further, the telescopic rod includes a fixed end and a telescopic end; the fixed end is fixed on the upper end surface of the inner cavity of the test chamber; the sealing airbag is arranged at the telescopic end.

[0014] Further, the telescopic rod includes a connecting rod, one end of the connecting rod is arranged on the telescopic rod, and the connecting rod is arranged close to the telescopic end.

[0015] Further, the sealing ring is arranged at the other end of the connecting rod away from the telescopic rod.

[0016] Further, it further includes a base and a bracket; the bracket is arranged on the base; the test chamber reciprocates up and down on the bracket.

[0017] Further, the base further includes a second sealing airbag, and the second sealing airbag is arranged on the upper end surface of the base; The piece to be detected is placed on the base, and the lower end of the hollow flow channel of the piece to be detected is arranged opposite to the second sealing airbag; the inflating member inflates the second sealing airbag, and the second sealing airbag expands to seal the lower end of the hollow flow channel.

[0018] On the other hand, the present invention also provides a sealing performance test method applicable to a high-overload servo actuator, which uses the above-mentioned sealing performance test device, and includes the following steps: Step 1: Inflate the surrounding airbag and the second sealing airbag, and fix the piece to be detected in the test chamber; Step 2: The inflating member inflates the inside of the test chamber, and the detecting member detects that the pressure value inside the test chamber reaches a predetermined pressure value and is stable at the predetermined pressure value, then the sealing performance of the piece to be detected is qualified, and the test ends; If the detecting member detects that the pressure value inside the test chamber does not reach the predetermined pressure value, or the pressure value cannot be stable at the predetermined pressure value, the sealing performance of the piece to be detected is unqualified, then the piece to be detected is subjected to the detection in Step 3; In Step 3, the first sealing airbag is inflated, the test chamber is divided into a second sub-test chamber and a third sub-test chamber, the second sub-test chamber and the third sub-test chamber are respectively inflated, and the pressure change situation after inflation is detected to determine that the sealing performance of the motor or the hollow flow channel of the piece to be detected is unqualified.

[0019] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects: (1)A sealing performance testing device for an anti-high-overload servo actuator according to the present invention places the part to be tested (anti-high-overload servo actuator) in a test chamber. An inflating part fills the test chamber with gas. If the pressure value in the test chamber remains unchanged within a predetermined time, the pre-potting of the part to be tested is qualified; if the pressure value in the test chamber decreases within the predetermined time, the pre-potting of the part to be tested is unqualified. To determine which part of the part to be tested has unqualified pre-potting, the inflating part inflates the first plugging airbag and the second plugging airbag, dividing the test chamber into a first sub-test chamber, a second sub-test chamber, and a third sub-test chamber. By detecting whether the pressure value decreases after the first sub-test chamber, the second sub-test chamber, and the third sub-test chamber are inflated, it is determined which part of the part to be tested has unqualified pre-potting, so as to perform re-potting targeted.

[0020] (2)A sealing performance testing device for an anti-high-overload servo actuator according to the present invention can detect whether the pre-sealing performance of the part to be tested meets the usage requirements of anti-high-overload. When the part to be tested is detected as a part with unqualified pre-potting, it can quickly determine which component of the part to be tested has unqualified pre-potting, re-pot the unqualified part of the pre-potting of the part to be tested targeted, or replace the defective component, saving maintenance time and increasing the yield rate of qualified products of the pre-potting of the part to be tested.

[0021] (3)A sealing performance testing device for an anti-high-overload servo actuator according to the present invention seals the upper sealing ring of the part to be tested through a sealing ring and seals the lower end of the hollow flow channel of the part to be tested through the second plugging airbag, so as to detect whether the overall pre-potting performance of the part to be tested is qualified. The sealing ring and the second plugging airbag are inflated to place the part to be tested in the test chamber, and the test chamber can test parts to be tested with different sizes.

[0022] (4)A sealing performance testing device for an anti-high-overload servo actuator according to the present invention By inflating the surrounding airbag, the first plugging airbag, and the second plugging airbag, the first sub-test chamber, the second sub-test chamber, and the third sub-test chamber are constructed. The pressure exerted by the airbag on the part to be tested can be controlled by the inflation volume, and at the same time, the amount of gas and the pressure value filled in the first sub-test chamber, the second sub-test chamber, and the third sub-test chamber are controlled, so as to determine the anti-high-overload degree of each component of the part to be tested respectively.

[0023] In the sealing test device for the anti-high overload servo actuator according to the present invention, the sealing test of the upper sealing ring is realized by inflating the surrounding airbag. The surrounding airbag can match workpieces to be detected with different sizes. At the corresponding positions on the surrounding airbag, a first shape memory alloy, a second shape memory alloy and a third shape memory alloy are arranged. The inflating member inflates the surrounding airbag, and the surrounding airbag moves towards the upper sealing ring of the workpiece to be detected, initially surrounding the upper sealing ring. By changing the temperatures of the first shape memory alloy, the second shape memory alloy and the third shape memory alloy, the shape memory alloys extend towards the workpiece to be detected, driving the surrounding airbag to squeeze the workpiece to be detected, ensuring good sealing performance of the first sub-test chamber and the accuracy of the detection.

[0024] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can be made obvious from the description, or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the content specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of showing specific embodiments, and are not considered as limitations to the present invention. Throughout the drawings, the same reference signs denote the same components. Figure 1 One of the structural schematic diagrams of the sealing test device for the anti-high overload servo actuator described in Embodiment 1; Figure 2 Structural schematic diagram of the anti-high overload servo actuator; Figure 3 Another structural schematic diagram of the sealing test device for the anti-high overload servo actuator described in Embodiment 1; Figure 4 Still another structural schematic diagram of the sealing test device for the anti-high overload servo actuator described in Embodiment 1; Figure 5 Structural schematic diagram of the telescopic rod in the sealing test device for the anti-high overload servo actuator described in Embodiment 1; Figure 6 Flowchart of the sealing test method for the anti-high overload servo actuator described in Embodiment 2.

[0026] REFERENCE SIGNS: 1 - Workpiece to be detected; 11 - Frame; 12 - Motor; 13 - Transmission mechanism; 14 - Hollow flow channel; 15 - Upper sealing ring; 16 - Lower sealing ring; 2 - Base; 21 - Second sealing airbag; 3 - Bracket; 31 - First chute; 32 - Fixed groove; 33 - First lead screw; 34 - First motor; 4 - Test chamber; 41 - Connection assembly; 411 - Connector; 412 - First rack; 42 - Sealing ring; 421 - Encircling airbag; 4211 - First inflation chamber; 42111 - First shape memory alloy; 4212 - Second inflation chamber; 42121 - Second shape memory alloy; 4213 - Third inflation chamber; 42131 - Third shape memory alloy; 43 - Telescopic rod; 431 - First plugging airbag; 432 - Outer cylinder; 4321 - Second motor; 4322 - Second lead screw; 433 - Telescopic cylinder; 434 - Damping pad; 44 - First sub - test chamber; 441 - Upper test chamber; 442 - Lower test chamber; 45 - Third sub - test chamber; 46 - Second sub - test chamber; 47 - Connecting rod; 48 - Cavity 5 - Inflation part interface 6 - Detection part Specific implementation mode

[0027] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, rather than to limit the scope of the present invention.

[0028] The test piece 1 described in the present invention, that is, the high - g servo actuator, as Figure 2 shown, includes a frame 11, a motor 12 and a transmission mechanism 13. The motors 12 are arranged in a matrix on the upper end surface of the frame 11. The transmission mechanism 13 is arranged inside the frame 11. A hollow flow channel 14 is opened at the center of the frame 11 and the transmission mechanism 13. An upper sealing ring 15 is arranged on the upper part of the side wall of the frame 11, and a lower sealing ring 16 is arranged on the lower end surface of the frame 11.

[0029] Embodiment 1 The present invention provides a sealing test device for a high - g servo actuator, as Figure 1 shown. The sealing detection device described in this embodiment performs a sealing detection on the test piece 1 as Figure 2 shown. It includes a base 2, a bracket 3, a test chamber 4, an inflation part and a detection part 6. An inflation part interface 5 is opened on the test chamber. The inflation part fills the test chamber 4 with detection gas through the inflation part interface 5. The detection part 6 is used to detect the gas pressure value in the test chamber 4. The bracket 3 is vertically arranged on the base 2, and the test chamber 4 is arranged on the bracket 3 in a liftable manner; the bracket 3 includes a first chute 31, a fixed slot 32 and a first lead screw 33. The first lead screw 33 is rotatably arranged in the fixed slot 32. The first lead screw 33 is arranged at the output end of a first motor 34, and the first lead screw 33 rotates driven by the first motor 34; the connection assembly 41 of the test chamber 4 is arranged on the bracket 3 in a liftable manner. The connection assembly 41 includes a connecting piece 411 and a first rack 412. The first rack 412 is arranged on the connecting piece 411; the connecting piece 411 includes a slider which is slidably arranged in the first chute 31. Correspondingly, the first rack 412 meshes with the first lead screw 33.

[0030] When the piece to be detected 1 is placed on the base 2, the first motor 34 is started. The first motor 34 drives the first lead screw 33 to rotate. The first lead screw 33 drives the first rack 412 to move downward, and then the test chamber 4 moves downward to the detection position of the piece to be detected 1.

[0031] As Figure 3 shown, the test chamber 4 includes a sealing ring 42 and a telescopic rod 43; the sealing ring 42 includes an encircling airbag 421. The inflating member inflates the encircling airbag 421, and the encircling airbag 421 encircles the upper sealing ring 15 of the piece to be detected 1 to form a first sub-test chamber 44 for sealing detection of the upper sealing ring 15; the telescopic rod 43 includes a first plugging airbag 431. The telescopic rod 43 extends into the hollow flow channel 14 of the piece to be detected 1. The inflating member inflates the first plugging airbag 431, and the first plugging airbag 431 plugs the hollow flow channel 14 to form a second sub-test chamber 46 for sealing detection of the hollow flow channel 14 of the piece to be detected 1. Wherein, the inflating member inflates the first sub-test chamber 44 and the second sub-test chamber 46, and the detecting member 6 performs sealing detection on the upper sealing ring 15 and the hollow flow channel 14 of the piece to be detected 1.

[0032] The test chamber 4 further includes a cavity 48 with one end open. The sealing ring 42 is arranged at the open end of the cavity 48, and the telescopic rod 43 is arranged in the cavity 48. When the encircling airbag 421 encircles the upper sealing ring 15 of the piece to be detected 1, the cavity 48 forms a sealing structure for sealing detection of the piece to be detected 1; when the first plugging airbag 431 plugs the hollow flow channel 14, the first plugging airbag 431 divides the sealing structure into the second sub-test chamber 46 and a third sub-test chamber 45; the third sub-test chamber 45 is used for sealing detection of the motor 12 of the piece to be detected 1.

[0033] When the test chamber 4 descends to the test position, the lower end of the telescopic rod 43 is exactly located at the upper end of the hollow flow channel 14, and the sealing ring 42 is located at the position of the upper sealing ring 15 of the component 1 to be detected; an inflation channel of the inflating component is arranged in the detection device. The inflation channel includes channel one, channel two, and channel three. One end of the inflation channel is connected to the inflating component interface 5, and the other end of the inflation channel is connected to the test chamber. The inflation channel is arranged in the detection device and its channel layout is adjusted according to the usage requirements. To ensure the sealing performance of the test chamber, the layout position of the channel is sealed. Channel one is used to inflate the surrounding airbag 421 and the first sub-test chamber 44 for leak tightness testing, and channel one is arranged on the side wall of the cavity 48. Channel two inflates the second sub-test chamber 46 for leak tightness testing, and channel two is arranged inside the telescopic rod 43. Channel three inflates the third sub-test chamber 45 for leak tightness testing.

[0034] In the embodiment, a connecting rod 47 is horizontally arranged on the telescopic rod 43. The connecting rod 47 is arranged near the telescopic end of the telescopic rod 43. When the telescopic rod 43 descends, the connecting rod 47 moves to the upper end surface of the frame 11, and the telescopic rod 43 stops descending. Due to the blockage of the frame 11, the connecting rod cannot continue to descend. In a specific embodiment, it can be achieved by setting the descending height, or by arranging a touch switch on the connecting rod 47. When the connecting rod contacts the upper end surface of the frame 11, the touch switch controls the first motor 34 to stop working, and the test chamber stops descending. At this time, the first sealing airbag 431 located at the telescopic end of the telescopic rod 43 is located at the upper end of the hollow flow channel 14, and the sealing ring 42 is located at the position of the upper sealing ring 15 of the component 1 to be detected.

[0035] Channel one includes a first branch, a second branch, a third branch, a fourth branch, and a fifth branch.

[0036] In the embodiment, as Figure 4 shown, the surrounding airbag 421 includes a first inflation chamber 4211, a second inflation chamber 4212, and a third inflation chamber 4213; the first branch communicates with the first inflation chamber 4211 and the inflating component, and the inflating component inflates the first inflation chamber 4211. The first acting end of the first inflation chamber 4211 expands downward and presses the upper end surface of the frame 11 of the component 1 to be detected; the second branch communicates with the second inflation chamber 4212 and the inflating component, and the inflating component inflates the second inflation chamber 4212. The second acting end of the second inflation chamber 4212 expands toward the upper sealing ring 15 and presses the upper sealing ring 15; the third branch communicates with the third inflation chamber 4213 and the inflating component, and the inflating component inflates the third inflation chamber 4213. The third acting end of the third inflation chamber 4213 expands toward the outer wall of the frame 11 of the component 1 to be detected and presses the outer wall of the frame 11 of the component 1 to be detected.

[0037] A sealed upper test chamber 441 is formed between the first inflation chamber 4211 and the second inflation chamber 4212, and a sealed lower test chamber 442 is formed between the second inflation chamber 4212 and the third inflation chamber 4213. A first air outlet valve is provided on the upper test chamber 441; a second air outlet valve is provided on the lower test chamber 442; a fourth branch communicates the inflatable member and the first air outlet valve, and a fifth branch communicates the inflatable member and the second air outlet valve; the sealed upper test chamber 441 and the lower test chamber 442 are inflated through the fourth branch and the fifth branch, and the detection member 6 detects the change in the gas pressure in the upper test chamber 441 and the lower test chamber 442 to detect whether the upper sealing ring 15 is sealed qualified.

[0038] In order to further ensure the sealing performance of the upper test chamber 441, a first shape memory alloy 42111 is provided inside the first acting end of the first inflation chamber 4211 to ensure that the first inflation chamber 4211 applies a certain acting force to the upper end face of the frame 11 of the component to be detected 1, ensuring the sealing performance between the first inflation chamber 4211 and the upper end face of the frame 11; at the same time, a second shape memory alloy 42121 is provided on the inner wall of the second acting end of the second inflation chamber 4212. When the second inflation chamber 4212 applies an acting force to the upper sealing ring 15 of the component to be detected 1, the second shape memory alloy 42121 is heated, and the second shape memory alloy 42121 further moves in the direction of the upper sealing ring 15, and the outer wall of the second inflation chamber 4212 presses the upper sealing ring 15, so that a sealed upper test chamber 441 is formed between the first inflation chamber 4211 and the second inflation chamber 4212; similarly, the third inflation chamber 4213 is inflated, and the third shape memory alloy 42131 on the inner wall of the third acting end of the third inflation chamber 4213 is energized, so that the outer wall of the third inflation chamber 4213 presses the outer wall of the frame 11, and a sealed lower test chamber 442 is formed between the second inflation chamber 4212 and the third inflation chamber.

[0039] In the embodiment, the first shape memory alloy 42111, the second shape memory alloy 42121 and the third shape memory alloy 42131 are all reverse-type elongation alloys, that is, they are in a contracted state at normal temperature and in an elongated state after heating; the heating wire (nickel-chromium wire) is spirally wound around the outside of the shape memory alloy spring at an interval of 2-3 mm and fixed with a high-temperature resistant insulating tape (such as polyimide tape). At the same time, in order to avoid damage to the airbag during the heating process of the heating wire, the airbag is made of high-temperature resistant rubber materials such as silicone rubber and fluororubber, or ceramic fiber cotton is provided between the heating wire and the inner wall of the airbag.

[0040] The sealed upper test chamber 441 and the lower test chamber 442 are inflated through the first air outlet valve and the second air outlet valve respectively to detect whether there is air leakage in the upper test chamber 441 and the lower test chamber 442, and the sealing performance of the upper sealing ring 15 of the component to be detected 1 is detected.

[0041] The second channel inflates the second sub-test chamber 46 for a leak tightness test.

[0042] When the first plugging airbag 431 is inflated to plug the upper end of the hollow flow channel 14, and the surrounding airbag 421 surrounds the upper sealing ring 42 of the component to be tested 1, the inflating member inflates the second sub-test chamber 46 through the second channel to detect whether there is air leakage in the second sub-test chamber 46, thereby completing the detection of the sealing performance of the motor 12 of the component to be tested 1.

[0043] The third channel inflates the third sub-test chamber 45 for a leak tightness test.

[0044] A fourth air outlet valve is provided on the first plugging airbag 431. The third channel includes a sixth branch channel and a seventh branch channel. The sixth branch channel communicates the inflating member and the first plugging airbag 431. The inflating member inflates the first plugging airbag 431 through the sixth branch channel, causing the first plugging airbag 431 to expand and plug the upper end of the hollow flow channel 14, and then the inflating member stops inflating the first plugging airbag 431.

[0045] The lower end surface of the hollow flow channel 14 is plugged by the gravitational force between the component to be tested and the base 2. Preferably, a second plugging airbag 21 is provided on the base 2. The second plugging airbag 21 is disposed opposite to the hollow flow channel 14. When the component to be tested 1 is disposed on the base 2, the second plugging airbag 21 is inflated to plug the lower end of the hollow flow channel 14, thereby achieving the plugging of the lower end of the hollow flow channel 14. The second channel is used to inflate the second plugging airbag 21, causing the second plugging airbag 21 to expand and plug the lower end of the hollow flow channel 14, and then the inflating member stops inflating the second plugging airbag 21.

[0046] The upper and lower ends of the hollow flow channel 14 are plugged by the first plugging airbag 431 and the second plugging airbag 21. The second branch channel inflates the plugged hollow flow channel 14 through the fourth air outlet valve, and the detector 6 detects the change in the gas pressure in the hollow flow channel 14 to detect whether the hollow flow channel 14 is sealed qualified.

[0047] Such as Figure 5As shown, the telescopic rod 43 includes an outer cylinder 432 and a telescopic cylinder 433, and the outer cylinder 432 is sleeved outside the telescopic cylinder 433; the first sealing airbag 431 is arranged at the telescopic end of the telescopic cylinder 433. The outer cylinder 432 includes a second motor 4321 and a second lead screw. The second motor 4321 and the second lead screw 4322 are arranged in the inner cavity of the outer cylinder 432. The second motor 4321 is fixed on the upper end face of the inner wall of the outer cylinder 432, and the second lead screw is arranged at the output end of the second motor 4321; a second rack is arranged in the telescopic cylinder 433, and the second rack is arranged opposite to the second lead screw 4322; a second chute is arranged on the inner wall of the outer cylinder 432, and a second slider is arranged at a position corresponding to the chute on the outer wall of the telescopic cylinder 433.

[0048] In the embodiment, a damping pad 434 is arranged at the lower end of the outer cylinder 432.

[0049] When detecting the airtightness of the third sub-test chamber 45, when it is found that there is a problem with poor sealing in the hollow flow channel 14 of the part to be detected 1, the first sealing airbag 431 after inflation is deflated, and the second motor 4321 is started, so that the telescopic cylinder 433 moves downward. The size of the telescopic rod 43 is smaller than the size of the hollow flow channel 14, and the telescopic cylinder 433 can extend to the inner wall of the hollow flow channel 14 and stop moving downward at the corresponding test site in the hollow flow channel 14. Then, the first sealing airbag 431 is inflated again. The area sealed by the first sealing airbag 431 and the second sealing airbag 21 is used as the third sub-test chamber 45, and its airtightness is tested to determine which area in the hollow flow channel 14 has a problem with poor pre-potting.

[0050] Embodiment 2 This embodiment provides a method for testing the airtightness of a high-overload servo actuator. The airtightness testing device described in Embodiment 1 is used to detect the airtightness of the pre-potted servo actuator, as Figure 6 shown, and it includes the following steps: Step 1, the part to be detected 1 is arranged on the base 2, and the lower end of the hollow flow channel 14 of the part to be detected 1 is arranged corresponding to the second sealing airbag 21; the test chamber 4 moves downward on the bracket 3, and the connecting rod 47 moves downward until the connecting rod 47 moves to the upper end face of the frame 11; the inflating member inflates the surrounding airbag 421 and the second sealing airbag 21, so that the surrounding airbag 421 surrounds the upper sealing ring 15 of the part to be detected, and at the same time, the second sealing airbag 21 seals the lower end of the hollow flow channel 14; Among them, when the inflating member inflates the surrounding airbag 421, it includes the following steps: 1.1. Given the rated pressure when the circumferential airbag 421 is inflated to 100%, inflate the circumferential airbag 421 at a rate of 0.1 MPa / s until the pressure inside the circumferential airbag 421 reaches 70% of the rated pressure; 1.2. Continue to inflate the circumferential airbag 421 at a rate of 0.02 MPa / s until the pressure inside the circumferential airbag 421 reaches 90% of the rated pressure; 1.3. Continue to inflate the circumferential airbag 421 at a rate of 0.01 MPa / s until the pressure inside the first sealing airbag 431 reaches 95% of the rated pressure; 1.4. Energize the heating wire to heat the first shape memory alloy 42111, the second shape memory alloy 42121, and the third shape memory alloy 42131 to cause them to collide, driving the circumferential airbag 421 to expand towards the test piece 1; continue to inflate the circumferential airbag 421 at a rate of 0.01 MPa / s until the pressure inside the first sealing airbag 431 reaches 100% - 105% of the rated pressure.

[0051] Step 2: The inflating member inflates the test chamber 4. If the pressure value in the test chamber 4 remains unchanged after inflation, the pre-potting of the test piece 1 is qualified, and the detection of the test piece 1 is completed; if the pressure in the test chamber 4 decreases, it indicates that the pre-potting inside the test piece to be tested is unqualified, and the following detection is carried out; In the vacuum potting environment, the pressure difference between the inside and outside of the aircraft is about 0.1 Mpa. Taking 0.5 MPa pressure as the ultimate compressive condition, evaluate the airtightness bearing capacity and the tolerable time of the servo actuator under this pressure. Use the inflating device to inflate the pressure test chamber 4. If the pressure gauge value can gradually rise with the inflation amount, it can prove that the internal flow path of the actuator is well sealed. When the pressure gauge value jumps to 0.5 MPa, at this time, the actuator inside the chamber and the outside are under a pressure difference of 0.5 MPa, stop inflating, and keep the pressure gauge showing 0.5 MPa for a period of time and then relieve the pressure.

[0052] Step 3: The inflator inflates the first sealing airbag 431. The first sealing airbag 431 seals the upper end of the hollow flow channel 14. The inflator inflates the second sub-test chamber 46 and the third sub-test chamber 45 respectively. If the air pressure in the second sub-test chamber 46 drops, it means that the motor 12 part of the workpiece 1 to be detected is not qualified for sealing. If the air pressure in the third sub-test chamber 45 drops, it means that the pre-potting of the hollow flow channel 14 of the workpiece 1 to be detected is not qualified. Perform a deflation operation on the first sealing airbag 431. The second motor 4321 drives the telescopic cylinder 433 to move downward along the hollow flow channel 14. After moving a predetermined distance, the inflator inflates the first sealing airbag 431 again. The first sealing airbag 431 and the second sealing airbag 21 redefine the third sub-test chamber 45, and then inflate the redefined third sub-test chamber 45 again to test the sealing performance of the redefined third sub-test chamber 45 until the area where the pre-sealing of the hollow flow channel 14 is unqualified is determined.

[0053] When the inflator inflates the first sealing airbag 431, the following steps are included: 3.1. Given the rated pressure when the first sealing airbag 431 is inflated to 100% expansion, inflate the first sealing airbag 431 at a rate of 0.1 MPa / s until the pressure inside the first sealing airbag 431 reaches 70% of the rated pressure. 3.2. Continue to inflate the first sealing airbag 431 at a rate of 0.02 MPa / s until the pressure inside the first sealing airbag 431 reaches 80% of the rated pressure. 3.3. Continue to inflate the first sealing airbag 431 at a rate of 0.01 MPa / s until the pressure inside the first sealing airbag 431 reaches 90% - 100% of the rated pressure.

[0054] The expansion diameter of the first sealing airbag 431 ; Wherein, D represents the expansion diameter of the first sealing airbag 431, d represents the distance between the inner walls of the hollow flow channel 14, and k is a coefficient with a value ranging from 1.1 to 1.3.

[0055] The first sealing airbag 431 has a small volume. The inflator first inflates the first sealing airbag 431 to 70% of the rated pressure to make the first sealing airbag 431 expand preliminarily and come into initial contact with the inner wall of the hollow flow channel 14. Then, reduce the inflation speed and inflate the pressure inside the first sealing airbag 431 to 80% of the rated pressure. During the further expansion of the first sealing airbag 431, the contact area between the outer wall of the first sealing airbag 431 and the inner wall of the hollow flow channel 14 is increased. Finally, at a rate of 0.01 MPa / s, the pressure inside the first sealing airbag 431 reaches 90% - 100% of the rated pressure.

[0056] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing test device for a high - overload resistant steering gear actuator, characterized in that, It includes a test chamber (4), an inflatable member, and a detection member (6); The test chamber (4) includes a sealing ring (42) and a telescopic rod (43); the sealing ring (42) includes an encircling airbag (421), the inflatable member inflates the encircling airbag (421), the encircling airbag (421) encircles the upper sealing ring (15) of the member to be detected (1), forming a first sub-test chamber (44) for sealing detection of the upper sealing ring (15); the telescopic rod (43) includes a first plugging airbag (431), the telescopic rod (43) extends into the hollow flow channel (14) of the member to be detected (1), the inflatable member inflates the first plugging airbag (431), and the first plugging airbag (431) plugs the hollow flow channel (14), forming a second sub-test chamber (46) for sealing detection of the hollow flow channel (14) of the member to be detected (1); Wherein, the inflatable member inflates the first sub-test chamber (44) and the second sub-test chamber (46), and the detection member (6) performs a sealing performance detection on the upper sealing ring (15) and the hollow flow channel (14) of the member to be detected (1).

2. The sealing test device for a high - overload resistant steering gear actuator according to claim 1, characterized in that, The test chamber (4) further includes a cavity (48) with one end open; the sealing ring (42) is arranged at the open end of the cavity (48), and the telescopic rod (43) is arranged inside the cavity (48); When the encircling airbag (421) encircles the upper sealing ring (15) of the member to be detected (1) and the first plugging airbag (431) plugs the hollow flow channel (14), the first plugging airbag (431) and the inner wall of the cavity (48) form a third sub-test chamber (45); the third sub-test chamber (45) is used for performing a sealing performance detection on the motor (12) of the member to be detected (1).

3. The sealing test device for a high - overload resistant steering gear actuator according to claim 2, characterized in that, The encircling airbag (421) includes a first inflation chamber (4211), a second inflation chamber (4212), and a third inflation chamber (4213); the inflatable member inflates the first inflation chamber (4211), the first acting end of the first inflation chamber (4211) expands downward and presses against the upper end surface of the frame (11) of the member to be detected (1); the inflatable member inflates the second inflation chamber (4212), the second acting end of the second inflation chamber (4212) expands toward the upper sealing ring (15) and presses against the upper sealing ring (15); the inflatable member inflates the third inflation chamber (4213), and the third acting end of the third inflation chamber (4213) expands toward the outer wall of the frame (11) of the member to be detected (1) and presses against the outer wall of the frame (11) of the member to be detected (1).

4. The sealing test device for a high - overload resistant steering gear actuator according to claim 3, characterized in that, The first sub-test chamber (44) includes an upper test chamber (441) and a lower test chamber (442); After the first inflation chamber (4211) and the second inflation chamber (4212) are inflated, the first inflation chamber (4211) and the second inflation chamber (4212) form the upper test chamber (441); After the second inflatable cavity (4212) and the third inflatable cavity (4213) are inflated, a lower test cavity (442) is formed between the second inflatable cavity (4212) and the third inflatable cavity (4213).

5. The sealing test device for a high - overload resistant steering gear actuator according to claim 3, characterized in that, A first shape memory alloy (42111) is provided on the inner wall of the first acting end; a second shape memory alloy (42121) is provided on the inner wall of the second acting end; a third shape memory alloy (42131) is provided on the inner wall of the third acting end.

6. The sealing test device for a high - overload resistant steering gear actuator according to claim 4, characterized in that, A first air outlet valve is provided on the upper test cavity (441); a second air outlet valve is provided on the lower test cavity (442); a third air outlet valve is provided on the second sub-test chamber (46); a fourth air outlet valve is provided on the third sub-test chamber (45).

7. The sealing test device for a high - overload resistant steering gear actuator according to claim 1, characterized in that, The telescopic rod (43) includes a fixed end and a telescopic end; the fixed end is fixed on the upper end surface of the inner cavity of the test chamber (4); the first sealing airbag (431) is provided at the telescopic end.

8. The sealing test device for a high - overload resistant steering gear actuator according to claim 7, characterized in that, The telescopic rod (43) includes a connecting rod (47), the connecting rod (47) is provided on the telescopic rod (43), and the connecting rod (47) is arranged close to the telescopic end.

9. The sealing test device for a high - overload resistant steering gear actuator according to claim 1, characterized in that, It further includes a base (2); a second sealing airbag (21) is provided on the base (2); The piece to be detected (1) is placed on the base (2), and the lower end of the hollow flow channel (14) of the piece to be detected (1) is arranged opposite to the second sealing airbag (21); the inflating member inflates the second sealing airbag (21), and the second sealing airbag (21) expands to seal the lower end of the hollow flow channel (14).

10. A sealing test method for a high - overload resistant steering gear actuator, characterized in that, Using the sealing performance testing device according to any one of claims 1-9, it includes the following steps: Step 1, inflate the surrounding airbag (421) and the second sealing airbag (21) to fix the piece to be detected (1) in the test chamber (4); Step 2, the inflating member inflates the inside of the test chamber (4), and the detector (6) detects that the pressure value inside the test chamber (4) reaches a predetermined pressure value and stabilizes at the predetermined pressure value, then the sealing performance of the piece to be detected (1) is qualified and the test ends; If the detector (6) detects that the pressure value inside the test chamber (4) does not reach the predetermined pressure value, or the pressure value cannot stabilize at the predetermined pressure value, and the sealing performance of the piece to be detected (1) is unqualified, then the piece to be detected (1) is subjected to the detection in Step 3; In Step 3, inflate the first sealing airbag (431) to divide the test chamber (4) into a second sub-test chamber (46) and a third sub-test chamber (45), respectively inflate the second sub-test chamber (46) and the third sub-test chamber (45), and detect the pressure change after inflation to determine that the sealing performance of the motor (12) or the hollow flow channel (14) of the piece to be detected (1) is unqualified.

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