A sealing test device and method for high overload resistant steering gear actuator

Abstract

The present invention relates to a sealing test device and method for a high-overload resistant servo actuator, which belongs to the technical field of servo sealing detection. It solves the technical problem in the prior art that it is impossible to perform partitioned detection and determine which area of ​​the servo actuator is unqualified for pre-filling during the detection process. The present invention includes a test chamber, an inflatable part, and a detection part; the test chamber includes a sealing ring and a telescopic rod, and the sealing ring and the telescopic rod divide the test chamber into a first sub-test chamber, a second sub-test chamber, and a third sub-test chamber for inflation, thereby completing the sealing test of the upper sealing ring, hollow flow channel, and motor of the part to be detected. The present invention can determine whether the part to be detected is a qualified pre-filled part, and further determine which part of the part to be detected that is unqualified for pre-filling is unqualified for pre-filling.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing detection of steering gears, and in particular to a sealing test device for a high-overload resistant steering gear actuator. Background Art

[0002] At present, in the design process of high-overload resistant servos, in addition to adopting measures such as high-overload resistant structures and high-overload resistant key parts, the most important means is to take measures such as 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 sealing the entire aircraft, vacuum potting is primarily used to ensure the sealant flows throughout the entire cabin. The aircraft is placed in a vacuum chamber, and the air inside is removed. As the air inside the chamber decreases, the pressure inside also decreases. This pressure forces the sealant to flow into the aircraft, and the vacuum sealant fills all gaps within the aircraft.

[0004] The servo actuator structure is complex, with its irregularly shaped frame featuring multiple channels and gaps, containing numerous components. The potting adhesive has low viscosity and high fluidity, which can easily lead to the adhesive seeping into the actuator, seriously affecting its operation and even causing the transmission to jam. Before the entire aircraft is potted, it is often necessary to pre-pot the actuator's internal channels, gaps, and other locations to ensure that the actuator can resist external colloid from penetrating the transmission components. Since the entire aircraft potting process is not reversible, verifying the sealing and reliability of the actuator's pre-potted locations before potting is particularly important.

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

[0006] In view of the above analysis, an embodiment of the present invention aims to provide a sealing test device for a high-overload resistant servo actuator, which is used to perform sealing performance testing on a pre-sealed high-overload resistant servo actuator, and during the sealing test, determine which component of the servo actuator has failed the pre-sealing process, and quickly reseal the unqualified component.

[0007] The present invention provides a sealing test device for a high-overload resistant steering gear actuator, which comprises a test chamber, an inflatable component, and a detection component; the inflatable component is used to fill the test chamber with a test gas; the detection component is used to detect the gas pressure value in the test chamber;

[0008] The test chamber includes a sealing ring and a telescopic rod; the sealing ring includes an embracing airbag, the inflatable member inflates the embracing airbag, and the embracing airbag surrounds the upper sealing ring of the part to be tested, forming a first sub-test chamber for sealing testing of the upper sealing ring; the telescopic rod includes a first blocking airbag, the telescopic rod extends into the hollow flow channel of the part to be tested, the inflatable member inflates the first blocking airbag, and the first blocking airbag blocks the hollow flow channel, forming a second sub-test chamber for sealing testing of the hollow flow channel of the part to be tested;

[0009] The inflatable component inflates the first and second sub-test chambers, and the detection component performs a sealing test on the upper sealing ring and the hollow flow channel of the component to be detected.

[0010] Furthermore, the test chamber further comprises a cavity with an open end, the sealing ring is arranged at the open end of the cavity, and the telescopic rod is arranged in the cavity;

[0011] When the embracing airbag embraces the upper sealing ring of the part to be tested and the first blocking airbag blocks the hollow flow channel, the first blocking airbag and the first blocking airbag form a third sub-test chamber; the third sub-test chamber is used to perform sealing testing on the motor of the part to be tested.

[0012] Furthermore, the surrounding airbag includes a first inflation chamber, a second inflation chamber and a third inflation chamber; the inflatable member inflates the first inflation chamber, and the first active end of the first inflation chamber expands downward and squeezes the upper end surface of the frame of the part to be detected; the inflatable member inflates the second inflation chamber, and the second active end of the second inflation chamber expands toward the upper sealing ring and squeezes the upper sealing ring; the inflatable member inflates the third inflation chamber, and the third active end of the third inflation chamber expands toward the outer wall of the frame of the part to be detected and squeezes the outer wall of the frame of the part to be detected.

[0013] Furthermore, the first sub-test chamber includes an upper test chamber and a lower test chamber;

[0014] 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 cavity;

[0015] When the second inflatable cavity and the third inflatable cavity are inflated, the lower test cavity is formed between the second inflatable cavity and the third inflatable cavity.

[0016] Furthermore, a first memory alloy is provided on the inner wall of the first active end; a second memory alloy is provided on the inner wall of the second active end; and a third memory alloy is provided on the inner wall of the third active end.

[0017] Furthermore, the upper test chamber is provided with a first air outlet valve; the lower test chamber is provided with a second air outlet valve; the second sub-test chamber is provided with a third air outlet valve; and the third sub-test chamber is provided with a fourth air outlet valve.

[0018] Furthermore, the telescopic rod includes a fixed end and a telescopic end; the fixed end is fixed to the upper end surface of the inner cavity of the test chamber; and the blocking airbag is arranged on the telescopic end.

[0019] Furthermore, 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.

[0020] Furthermore, the sealing ring is arranged at the other end of the connecting rod away from the telescopic rod.

[0021] Furthermore, it also includes a base and a bracket; the bracket is arranged on the base; and the test chamber reciprocates up and down on the bracket.

[0022] Furthermore, the base further comprises a second blocking airbag, which is arranged on the upper end surface of the base;

[0023] The part to be tested is placed on the base, and the lower end of the hollow flow channel of the part to be tested is arranged opposite to the second blocking airbag; the inflatable part inflates the second blocking airbag, and the second blocking airbag expands to block the lower end of the hollow flow channel.

[0024] Another aspect of the present invention provides a sealing test method for a high-overload resistant steering gear actuator, which uses the above-mentioned sealing test device and includes the following steps:

[0025] Step 1: Inflate the surrounding airbag and the second blocking airbag, and fix the object to be tested in the test chamber;

[0026] Step 2: The inflatable component inflates the test chamber, and the detection component detects that the pressure value in the test chamber reaches a predetermined pressure value and stabilizes at the predetermined pressure value, indicating that the sealing performance of the component to be tested is qualified, and the test is terminated;

[0027] If the pressure value in the test chamber detected by the detection component does not reach the predetermined pressure value, or the pressure value cannot be stabilized at the predetermined pressure value, the sealing performance of the component to be detected is unqualified, and the component to be detected is tested in step three;

[0028] In the step three, the first blocking airbag is inflated to divide the test chamber into a second sub-test chamber and a third sub-test chamber, the second sub-test chamber and the third sub-test chamber are inflated respectively, and the pressure change after inflation is detected to determine whether the sealing performance of the motor or hollow flow channel of the test part is unqualified.

[0029] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0030] (1) The sealing test device for a high-overload servo actuator according to the present invention is characterized in that the part to be tested (the high-overload servo actuator) is placed in a test chamber, and the inflatable part fills the test chamber with gas. If the pressure value in the test chamber remains unchanged within a predetermined time, the pre-sealing of the part to be tested is qualified; if the pressure value in the test chamber decreases within a predetermined time, the pre-sealing of the part to be tested is unqualified. In order to determine which part of the pre-sealing of the part to be tested is unqualified, the inflatable part inflates the first blocking airbag and the second blocking 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 values ​​of the first sub-test chamber, the second sub-test chamber and the third sub-test chamber decrease after being inflated, it is determined which part of the pre-sealing of the part to be tested is unqualified, so that resealing can be performed in a targeted manner.

[0031] (2) The sealing test device for a high overload resistant servo actuator described in the present invention can detect whether the pre-sealing performance of the part to be tested meets the use requirements of high overload resistance. When the part to be tested is detected as a pre-sealed unqualified part, it can quickly determine which part of the part to be tested is unqualified in pre-sealing, and re-seal the unqualified pre-sealed part of the part to be tested or replace the defective part in a targeted manner, thereby saving maintenance time and improving the output rate of qualified pre-sealed parts of the part to be tested.

[0032] (3) The sealing test device for a high-overload resistant servo actuator described in the present invention seals the upper sealing ring of the part to be tested by a sealing ring, and seals the lower end of the hollow flow channel of the part to be tested by a second blocking airbag, so that the pre-filling performance of the whole part to be tested is tested to see whether it is qualified. The sealing ring and the second blocking airbag are inflated to place the part to be tested in a test chamber, and the test chamber can test parts to be tested of different sizes.

[0033] (4) A sealing test device for a high overload resistant steering gear actuator according to the present invention,

[0034] By inflating the surrounding airbag, the first blocking airbag and the second blocking airbag, the first sub-test chamber, the second sub-test chamber and the third sub-test chamber are constructed. The pressure applied by the airbag to the part to be tested can be controlled by the inflation volume. At the same time, the amount of air filled in the first sub-test chamber, the second sub-test chamber and the third sub-test chamber and the pressure value are controlled to determine the degree of resistance to high overload of each component of the part to be tested.

[0035] (5) In the sealing test device for a high overload resistant servo actuator described in the present invention, the sealing test of the upper sealing ring is achieved by inflating the surrounding airbag. The surrounding airbag can match the parts to be tested of different sizes. At the same time, the first memory alloy, the second memory alloy and the third memory alloy are arranged at corresponding positions on the surrounding airbag. The inflatable part inflates the surrounding airbag, and the surrounding airbag moves toward the upper sealing ring of the part to be tested, initially encircling the upper sealing ring, changing the temperature of the first memory alloy, the second memory alloy and the third memory alloy. The memory alloy extends toward the part to be tested, driving the surrounding airbag to squeeze toward the part to be tested, ensuring that the first sub-test chamber has good sealing performance and the accuracy of the test.

[0036] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. Throughout the drawings, the same reference symbols denote the same components.

[0038] Figure 1 This is a schematic diagram of the structure of the sealing test device for the high-overload resistant steering gear actuator described in Example 1;

[0039] Figure 2 Schematic diagram of the structure of the anti-high overload steering gear actuator;

[0040] Figure 3 This is a second structural schematic diagram of the sealing test device for the high-overload resistant steering gear actuator described in Example 1;

[0041] Figure 4 This is a third structural schematic diagram of the sealing test device for the high-overload resistant steering gear actuator described in Example 1;

[0042] Figure 5 This is a schematic structural diagram of the telescopic rod in the sealing test device for the high-overload servo actuator described in Example 1;

[0043] Figure 6 This is a flow chart of the sealing test method for the high-overload resistant servo actuator described in Example 2.

[0044] Reference numerals:

[0045] 1-Part to be tested; 11-Frame; 12-Motor; 13-Transmission mechanism; 14-Hollow flow channel; 15-Upper sealing ring; 16-Lower sealing ring;

[0046] 2-base; 21-second blocking airbag;

[0047] 3- bracket; 31- first slide slot; 32- fixed slot; 33- first lead screw; 34- first motor;

[0048] 4-test chamber; 41-connecting assembly; 411-connecting piece; 412-first rack; 42-sealing ring; 421-encircling airbag; 4211-first inflatable chamber; 42111-first memory alloy; 4212-second inflatable chamber; 42121-second memory alloy; 4213-third inflatable chamber; 42131-third memory alloy; 43-telescopic rod; 431-first blocking 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;

[0049] 5-Inflatable component interface;

[0050] 6-Test piece. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0052] The component to be tested 1 of the present invention is a high overload resistant steering gear actuator. Figure 2 As shown, it includes a frame 11, a motor 12 and a transmission mechanism 13. The motor 12 is arranged in a matrix on the upper end surface of the frame 11, and the transmission mechanism 13 is arranged in the frame 11. A hollow flow channel 14 is opened in the center of the frame 11 and the transmission mechanism 13. An upper sealing ring 15 is provided on the upper part of the side wall of the frame 11, and a lower sealing ring 16 is provided on the lower end surface of the frame 11.

[0053] Example 1

[0054] The present invention provides a sealing test device for a high overload resistant steering gear actuator, such as Figure 1 As shown, the sealing detection device described in this embodiment is Figure 2The test piece 1 shown in the figure is subjected to a sealing test and comprises a base 2, a bracket 3, a test chamber 4, an inflatable member, and a test member 6. The test chamber is provided with an inflatable member interface 5, through which the inflatable member fills the test chamber 4 with test gas. The test member 6 is used to detect the gas pressure value in the test chamber 4.

[0055] The bracket 3 is vertically arranged on the base 2, and the test cabin 4 can be raised and lowered on the bracket 3; the bracket 3 includes a first slide groove 31, a fixed groove 32 and a first screw 33, the first screw 33 is rotatably arranged in the fixed groove 32, the first screw 33 is arranged at the output end of the first motor 34, and the first screw 33 rotates under the drive of the first motor 34; the connecting component 41 of the test cabin 4 can be raised and lowered on the bracket 3, the connecting component 41 includes a connecting member 411 and a first rack 412, the first rack 412 is arranged on the connecting member 411; the connecting member 411 includes a slider, the slider is slidably arranged in the first slide groove 31, and correspondingly, the first rack 412 is engaged with the first screw 33.

[0056] When the test piece 1 is placed on the base 2, the first motor 34 is started, the first motor 34 drives the first screw 33 to rotate, and the first screw 33 drives the first rack 412 to move downward, thereby realizing the downward movement of the test chamber 4 to the detection position of the test piece 1.

[0057] like Figure 3 As shown, the test chamber 4 includes a sealing ring 42 and a telescopic rod 43; the sealing ring 42 includes an embracing airbag 421, and the inflatable member inflates the embracing airbag 421, and the embracing airbag 421 surrounds the upper sealing ring 15 of the to-be-tested part 1, forming a first sub-test chamber 44 for performing a sealing test on the upper sealing ring 15; the telescopic rod 43 includes a first blocking airbag 431, and the telescopic rod 43 extends into the hollow flow channel 14 of the to-be-tested part 1, and the inflatable member inflates the first blocking airbag 431, and the first blocking airbag 431 blocks the hollow flow channel 14, forming a second sub-test chamber 46 for performing a sealing test on the hollow flow channel 14 of the to-be-tested part 1;

[0058] The inflatable component inflates the first and second sub-test chambers 44 and 46 , and the detection component 6 performs a sealing test on the upper sealing ring 15 and the hollow flow channel 14 of the component to be detected 1 .

[0059] The test chamber 4 further includes a cavity 48 with an open end, the sealing ring 42 is disposed at the open end of the cavity 48, and the telescopic rod 43 is disposed in the cavity 48;

[0060] When the embracing airbag 421 embraces the upper sealing ring 15 of the part to be tested 1, the cavity 48 forms a sealing structure for performing a sealing test on the part to be tested 1; when the first blocking airbag 431 blocks the hollow flow channel 14, the first blocking airbag 431 divides the sealing structure into the second sub-test chamber 46 and the third sub-test chamber 45; the third sub-test chamber 45 is used to perform a sealing test on the motor 12 of the part to be tested 1.

[0061] When the test chamber 4 is lowered 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 part to be tested 1; the testing device is provided with an inflation channel for the inflatable part, and the inflation channel includes channel 1, channel 2, and channel 3. One end of the inflation channel is connected to the inflatable part interface 5, and the other end of the inflation channel is connected to the test chamber. The inflation channel is set in the testing device and the channel layout is arranged according to the needs of use; in order to ensure the sealing of the test chamber, the layout position of the channel is sealed. Channel 1 is used to inflate the surrounding airbag 421 and the first sub-test chamber 44 for sealing testing. Channel 1 is set on the side wall of the cavity 48. Channel 2 is used to inflate the second sub-test chamber 46 for sealing testing. Channel 2 is set in the telescopic rod 43. Channel 3 is used to inflate the third sub-test chamber 45 for sealing testing.

[0062] 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 obstruction of the frame 11, the connecting rod cannot continue to descend. In a specific embodiment, this can be achieved by setting a descent height, or by setting 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 blocking 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 part to be tested 1.

[0063] The channel 1 includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch.

[0064] In the embodiment, Figure 4As 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 connects the first inflation chamber 4211 and the inflatable member, and the inflatable member inflates the first inflation chamber 4211, and the first active end of the first inflation chamber 4211 expands downward and squeezes the upper end surface of the frame 11 of the part to be detected 1; the second branch connects the second inflation chamber 4212 and the inflatable member, and the inflatable member inflates the second inflation chamber 4212, and the second active end of the second inflation chamber 4212 expands toward the upper sealing ring 15 and squeezes the upper sealing ring 15; the third branch connects the third inflation chamber 4213 and the inflatable member, and the inflatable member inflates the third inflation chamber 4213, and the third active end of the third inflation chamber 4213 expands toward the outer wall of the frame 11 of the part to be detected 1 and squeezes the outer wall of the frame 11 of the part to be detected 1.

[0065] 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. The upper test chamber 441 is provided with a first air outlet valve; the lower test chamber 442 is provided with a second air outlet valve; the fourth branch connects the inflatable component and the first air outlet valve, and the fifth branch connects the inflatable component 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 component 6 detects the changes in the gas pressure in the upper test chamber 441 and the lower test chamber 442, and detects whether the upper sealing ring 15 is sealed properly.

[0066] In order to further ensure the sealing of the upper test cavity 441, a first memory alloy 42111 is provided inside the first action end of the first air-filled cavity 4211, ensuring that the first air-filled cavity 4211 applies a certain force to the upper end surface of the frame 11 of the to-be-tested object 1, ensuring that the first air-filled cavity 4211 and the upper end surface of the frame 11 have a sealing performance; at the same time, a second memory alloy 42121 is provided on the inner wall of the second action end of the second air-filled cavity 4212, and when the second air-filled cavity 4212 applies a force to the upper sealing ring 15 of the to-be-tested object 1, the second memory alloy 42121 is heated. 121, the second memory alloy 42121 further moves toward the upper sealing ring 15, and the outer wall of the second air-inflating chamber 4212 squeezes the upper sealing ring 15, so that a closed upper test chamber 441 is formed between the first air-inflating chamber 4211 and the second air-inflating chamber 4212; similarly, the third air-inflating chamber 4213 is inflated, and the third memory alloy 42131 on the inner wall of the third active end of the third air-inflating chamber 4213 is energized, so that the outer wall of the third air-inflating chamber 4213 squeezes the outer wall of the frame 11, so that a closed lower test chamber 442 is formed between the second air-inflating chamber 4212 and the third air-inflating chamber.

[0067] In this embodiment, the first memory alloy 42111, the second memory alloy 42121, and the third memory alloy 42131 are all inverted elongation alloys, meaning they are contracted at room temperature and elongated upon heating. A heating wire (nickel-chromium wire) is spirally wound around the outside of the memory alloy spring at a pitch of 2-3 mm and secured with high-temperature insulating tape (such as polyimide tape). To prevent damage to the airbag during heating by the heating wire, the airbag is made of a high-temperature resistant rubber material such as silicone rubber or fluororubber, or ceramic fiber wool is interposed between the heating wire and the inner wall of the airbag.

[0068] The sealed upper test chamber 441 and the lower test chamber 442 are inflated through the first and second air outlet valves respectively to detect whether there is any leakage in the upper test chamber 441 and the lower test chamber 442, thereby completing the test of the sealing performance of the sealing ring 15 on the test piece 1.

[0069] The second channel inflates the second sub-test chamber 46 to perform a sealing test.

[0070] When the upper first blocking airbag 431 is inflated to block the upper end of the hollow flow channel 14, and the embracing airbag 421 embraces the upper sealing ring 42 of the part to be tested 1, the inflatable part inflates the second sub-test chamber 46 through channel 2 to detect whether there is any leakage in the second sub-test chamber 46, thereby completing the inspection of the sealing performance of the motor 12 of the part to be tested 1.

[0071] The channel three inflates the third sub-test chamber 45 to perform a sealing test.

[0072] A fourth air outlet valve is provided on the first blocking airbag 431, and the channel three includes a sixth branch channel and a seventh branch channel. The sixth branch channel connects the inflatable part and the first blocking airbag 431, and the inflatable part inflates the first blocking airbag 431 through the sixth branch channel, so that the first blocking airbag 431 blocks the upper end of the hollow flow channel 14 after expansion, and the inflatable part stops inflating the first blocking airbag 431.

[0073] The lower end face of the hollow flow channel 14 is blocked by the gravity between the test piece and the base 2. Preferably, a second blocking airbag 21 is provided on the base 2, and the second blocking airbag 21 is arranged opposite to the hollow flow channel 14. When the test piece 1 is set on the base 2, the second blocking airbag 21 is inflated, and the second blocking airbag 21 blocks the lower end of the hollow flow channel 14, thereby achieving the blocking of the lower end of the hollow flow channel 14. The second channel is used to inflate the second blocking airbag 21, so that the second blocking airbag 21 blocks the lower end of the hollow flow channel 14 after expansion, and the inflator stops inflating the second blocking airbag 21.

[0074] The upper and lower ends of the hollow flow channel 14 are sealed by the first sealing airbag 431 and the second sealing airbag 21, and the second branch channel inflates the sealed hollow flow channel 14 through the fourth air outlet valve. The detection part 6 detects the change in gas pressure in the hollow flow channel 14 to detect whether the hollow flow channel 14 is sealed properly.

[0075] like Figure 5 As shown, the telescopic rod 43 includes an outer tube 432 and a telescopic tube 433, and the outer tube 432 is sleeved on the outside of the telescopic tube 433; the first blocking airbag 431 is arranged at the telescopic end of the telescopic tube 433, and the outer tube 432 includes a second motor 4321 and a second screw, and the second motor 4321 and the second screw 4322 are arranged in the inner cavity of the outer tube 432, and the second motor 4321 is fixed on the upper end surface of the inner wall of the outer tube 432, and the second screw is arranged at the output end of the second motor 4321; a second rack is arranged in the telescopic tube 433, and the second rack is arranged opposite to the second screw 4322; a second slide groove is provided on the inner wall of the outer tube 432, and a second slider is provided on the outer wall of the telescopic tube 433 at a position corresponding to the slide groove.

[0076] In the embodiment, a damping pad 434 is provided at the lower end of the outer cylinder 432 .

[0077] When the third sub-test chamber 45 is tested for sealing, if it is found that there is a poor sealing problem in the hollow flow channel 14 of the test piece 1, the first blocking airbag 431 is deflated after inflation, and the second motor 4321 is started to move the telescopic cylinder 433 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 reach the inner wall of the hollow flow channel 14 and stop moving downward at the corresponding test point in the hollow flow channel 14. The first blocking airbag 431 is inflated again, and the area sealed by the first blocking airbag 431 and the second blocking airbag 21 is used as the third sub-test chamber 45, which is subjected to a sealing test to determine which area in the hollow flow channel 14 has the problem of poor pre-sealing.

[0078] Example 2

[0079] This embodiment provides a method for testing the sealing performance of a high overload resistant steering gear actuator, which uses the sealing testing device described in Example 1 to perform sealing testing on a pre-filled steering gear actuator. Figure 6 As shown, it includes the following steps:

[0080] Step 1: Place the test piece 1 on the base 2, with the lower end of the hollow flow channel 14 of the test piece 1 corresponding to the second blocking 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 surface of the frame 11; the inflatable member inflates the embracing airbag 421 and the second blocking airbag 21, so that the embracing airbag 421 embraces the upper sealing ring 15 of the test piece, and at the same time, the second blocking airbag 21 blocks the lower end of the hollow flow channel 14;

[0081] The inflatable member inflates the surrounding airbag 421, including the following steps:

[0082] 1.1. Given the rated pressure of the surrounding airbag 421 when it is 100% inflated, inflate the surrounding airbag 421 at a rate of 0.1 MPa / s until the pressure inside the surrounding airbag 421 reaches 70% of the rated pressure;

[0083] 1.2. Continue to inflate the surrounding airbag 421 at a rate of 0.02 MPa / s until the internal pressure of the surrounding airbag 421 reaches 90% of the rated pressure;

[0084] 1.3, continue to inflate the surrounding airbag 421 at a rate of 0.01 MPa / s until the internal pressure of the first blocking airbag 431 reaches 95% of the rated pressure;

[0085] 1.4. Energize the heating wire to heat and collide the first memory alloy 42111, the second memory alloy 42121, and the third memory alloy 42131, driving the surrounding airbag 421 to expand toward the test piece 1; continue to inflate the surrounding airbag 421 at a rate of 0.01 MPa / s until the internal pressure of the first blocking airbag 431 reaches 100%-105% of the rated pressure.

[0086] Step 2: The inflatable member inflates the test chamber 4. If the pressure in the test chamber 4 remains unchanged after inflation, the pre-filling of the test piece 1 is qualified, and the test of the test piece 1 is completed. If the pressure in the test chamber 4 decreases, it means that the pre-filling inside the test piece is unqualified, and the following test is performed;

[0087] In a vacuum potting environment, the pressure differential between the inside and outside of the aircraft is approximately 0.1 MPa. Using a pressure of 0.5 MPa as the ultimate pressure resistance condition, the servo actuator's airtightness tolerance and the duration of its ability to withstand this pressure are tested. Using an inflation device, the pressure test chamber 4 is inflated. If the pressure gauge reading gradually increases with the amount of air inflated, it indicates that the actuator's internal flow channel is properly sealed. When the pressure gauge reading reaches 0.5 MPa, indicating a 0.5 MPa pressure differential between the actuator inside the chamber and the outside world, inflation is stopped. The pressure gauge maintains 0.5 MPa for a period of time before releasing the pressure.

[0088] In step three, the inflatable component inflates the first blocking airbag 431, and the first blocking airbag 431 blocks the upper end of the hollow flow channel 14. The inflatable component 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, the motor 12 part and the blocking of the test piece 1 are unqualified; if the air pressure in the third sub-test chamber 45 drops, the pre-filling of the hollow flow channel 14 of the test piece 1 is unqualified; the first blocking airbag 431 is deflated, and the second motor 4321 drives the telescopic cylinder 433 to move toward the lower part of the hollow flow channel 14. After moving a predetermined distance, the inflatable component inflates the first blocking airbag 431, and the third sub-test chamber 45 is redefined between the first blocking airbag 431 and the second blocking airbag 21. The third sub-test chamber 45 is inflated again to test the sealing performance of the redefined third sub-test chamber 45; until the pre-sealing unqualified area in the hollow flow channel 14 is determined.

[0089] The inflating member inflates the first blocking airbag 431, including the following steps:

[0090] 3.1. Given the rated pressure of the first blocking airbag 431 when inflated to 100%, inflate the first blocking airbag 431 at a rate of 0.1 MPa / s until the pressure inside the first blocking airbag 431 reaches 70% of the rated pressure;

[0091] 3.2. Continue to inflate the first blocking airbag 431 at a rate of 0.02 MPa / s until the internal pressure of the first blocking airbag 431 reaches 80% of the rated pressure;

[0092] 3.3. Continue to inflate the first blocking airbag 431 at a rate of 0.01 MPa / s until the internal pressure of the first blocking airbag 431 reaches 90% to 100% of the rated pressure.

[0093] The first blocking airbag 431 has an expanded diameter ;

[0094] Wherein, D represents the expanded diameter of the first blocking airbag 431, d represents the distance between the inner walls of the hollow flow channel 14, and k represents a coefficient, with a value of k ranging from 1.1 to 1.3.

[0095] The first blocking airbag 431 is relatively small in size. The inflator first inflates the first blocking airbag 431 to 70% of the rated pressure, so that the first blocking airbag 431 is initially deployed and the first blocking airbag 431 is initially in contact with the inner wall of the hollow flow channel 14; then the inflation speed is reduced, and the internal pressure of the first blocking airbag 431 is inflated to 80% of the rated pressure. During the further expansion of the first blocking airbag 431, the contact area between the outer wall of the first blocking airbag 431 and the inner wall of the hollow flow channel 14 is increased; finally, at a speed of 0.01 MPa / s, the internal pressure of the first blocking airbag 431 reaches 90%~100% of the rated pressure.

[0096] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A sealing test device for a high overload resistant steering gear actuator, characterized in that: The device comprises a test chamber (4), an inflatable component, a detection component (6), and a base (2); the component to be detected (1) is placed on the base (2); a second blocking airbag (21) is provided on the base (2); the second blocking airbag (21) is arranged opposite to the lower end of the hollow flow channel (14) of the component to be detected (1); The test chamber (4) includes a sealing ring (42) and a telescopic rod (43); the sealing ring (42) includes an embracing airbag (421), and the embracing airbag (421) can match the test pieces of different sizes; the inflatable member inflates the embracing airbag (421), and the embracing airbag (421) surrounds the upper sealing ring (15) of the test piece (1) to form a first sub-test chamber (44) for performing a sealing test on the upper sealing ring (15); the telescopic rod (43) includes a first blocking airbag ( 431), the telescopic rod (43) extends into the hollow flow channel (14) of the part to be tested (1), the inflatable part inflates the first blocking airbag (431), the first blocking airbag (431) blocks the hollow flow channel (14), the inflatable part inflates the second blocking airbag (21), the second blocking airbag (21) expands to block the lower end of the hollow flow channel (14), and forms a second sub-test chamber (46) for performing a sealing test on the hollow flow channel (14) of the part to be tested (1); The inflatable component inflates the first sub-test chamber (44) and the second sub-test chamber (46), and the detection component (6) performs a sealing test on the upper sealing ring (15) and the hollow flow channel (14) of the component to be detected (1).

2. The sealing test device for high overload resistant steering gear actuator according to claim 1, characterized in that: The test chamber (4) further comprises a cavity (48) with an open end; 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 embracing airbag (421) embraces the upper sealing ring (15) of the part to be tested (1) and the first blocking airbag (431) blocks the hollow flow channel (14), the first blocking 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 to perform a sealing test on the motor (12) of the part to be tested (1).

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

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

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

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

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

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

9. A method for testing the sealing performance of a high overload resistant steering gear actuator, characterized in that: Using the sealing test device according to any one of claims 1 to 8, comprising the following steps: Step 1: Inflate the surrounding airbag (421) and the second blocking airbag (21), and fix the object to be tested (1) in the test chamber (4); Step 2: the inflatable component inflates the test chamber (4), and the detection component (6) detects that the pressure value in the test chamber (4) reaches a predetermined pressure value and stabilizes at the predetermined pressure value, then the sealing performance of the component to be detected (1) is qualified, and the test is terminated; If the pressure value in the test chamber (4) detected by the detection component (6) does not reach the predetermined pressure value, or the pressure value cannot be stabilized at the predetermined pressure value, the sealing performance of the test component (1) is unqualified, and the test of step three is performed on the test component (1); In the step three, the first blocking airbag (431) is inflated to divide the test chamber (4) into a second sub-test chamber (46) and a third sub-test chamber (45), the second sub-test chamber (46) and the third sub-test chamber (45) are inflated respectively, and the pressure change after inflation is detected to determine whether the sealing performance of the motor (12) or the hollow flow channel (14) of the component to be tested (1) is unqualified.

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