CN211954645U - Clamp for testing durability of rotary lock - Google Patents
Clamp for testing durability of rotary lock Download PDFInfo
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- CN211954645U CN211954645U CN202020860826.6U CN202020860826U CN211954645U CN 211954645 U CN211954645 U CN 211954645U CN 202020860826 U CN202020860826 U CN 202020860826U CN 211954645 U CN211954645 U CN 211954645U
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 62
- 230000033001 locomotion Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses an anchor clamps for testing rotatory lock durability, include: the rotary lock comprises a vertical plate, a lower flat plate, a horizontal plate, a left end and an upper flat plate, wherein the vertical plate is fixed on a machine tool through a bolt, the lower flat plate is positioned at the lower side of the vertical plate, the left end of the vertical plate is fixedly connected with the lower end of the vertical plate, the upper flat plate is horizontally arranged and positioned at the upper side of the vertical plate, the left end of the upper flat plate is fixedly connected with the upper end of the vertical plate, the upper flat plate, the vertical plate and the lower flat plate are mutually matched to form a C-; the clamping plate is vertically arranged and is positioned between the lower flat plate and the upper flat plate and outside the inner cavity of the C-shaped part, a fixing hole is formed in the clamping plate in a penetrating mode, the fixing hole is used for fixing an adjusting mechanism of the rotary lock on the left side plate surface of the clamping plate, and the adjusting mechanism is used for fixing the lock rod; the utility model discloses the uniformity is good, and the accuracy is high, and the good reliability replaces the manual work completely to carry out the durability test, has practiced thrift the cost, has improved efficiency.
Description
Technical Field
The utility model belongs to rotatory lock durability test field especially relates to an anchor clamps for testing rotatory lock durability.
Background
The durability test is a test performed for measuring the service life of a product under the examination, verification and maintenance conditions for specifying the service life and reliability, and predicting or verifying weak links and dangerous parts of a structure. The test frequency and time of the endurance test are generally longer than those of the reliability test, through the endurance test, which parts in the product design and manufacture have problems in reliability so as to improve the design or improve the process level, and meanwhile, through measuring the fatigue and abrasion change of the main part, the method can provide a basis for the design calculation of the service life of similar products in the future, and can calculate the service life of new products.
The durability test of the rotary lock is a form of product reliability test, the consistency, accuracy and reliability of the test and test method are all critical, in the prior art, the durability test is carried out by artificially rotating with external force, and the consistency, accuracy and reliability are different, so that the existing test requirements cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an anchor clamps for testing rotatory lock durability to solve artifical operation and carry out rotatory lock durability test reliability poor, problem with high costs.
The utility model adopts the following technical scheme: a fixture for testing the durability of a rotary lock, comprising:
a vertical plate which is vertically arranged,
a lower flat plate which is horizontally arranged, is fixed on the machine tool through bolts, is positioned at the lower side of the vertical plate, the left end of the lower flat plate is fixedly connected with the lower end of the vertical plate,
the upper flat plate is horizontally arranged and positioned on the upper side of the vertical plate, the left end of the upper flat plate is fixedly connected with the upper end of the vertical plate, the upper flat plate, the vertical plate and the lower flat plate are mutually matched to form a C-shaped part, and the inner cavity of the C-shaped part is used for accommodating the rotary lock;
the clamping plate is vertically arranged and is positioned between the lower flat plate and the upper flat plate and outside the inner cavity of the C-shaped part, a fixing hole is formed in the clamping plate in a penetrating mode, the fixing hole is used for fixing an adjusting mechanism of the rotary lock on the left side plate surface of the clamping plate, and the adjusting mechanism is used for fixing the lock rod;
wherein, go up and run through on the dull and stereotyped mounting hole of having seted up, the mounting hole suits with the rotor of rotatory lock, and the mounting hole is used for the spanner to stretch into the rotor lower extreme of rotatory lock, and lower flat board is used for the lathe to drive its rotation for the spring bolt that spanner rotated lock body mechanism carries out the reciprocating motion of locking and opening.
Furthermore, a plurality of threaded holes are formed in the upper flat plate and around the mounting hole, and each threaded hole is used for fixing the lock body mechanism below the upper flat plate through a bolt.
Furthermore, two positioning holes are formed in the vertical plate and used for horizontally fixing the clamping plate fixed with the adjusting mechanism on the vertical plate from right to left through the positioning bolts.
Furthermore, two positioning bolts are all sleeved with pretightening force springs, and each pretightening force spring is used for providing pretightening force between the lock body mechanism and the adjusting mechanism.
Furthermore, a T-shaped piece with a T-shaped cross section is fixedly connected to the lower plate surface of the lower flat plate, the vertical section of the T-shaped piece is arranged below the upper transverse section of the T-shaped piece, and the vertical section of the T-shaped piece is used for extending into a limiting groove on a machine tool, so that the machine tool drives the clamp to rotate.
Furthermore, the lower bottom surface of the upper flat plate is curved and is matched with the lower bottom surface of the rotary lock.
The utility model has the advantages that: the utility model fixes the rotary lock in the inner cavity of the C-shaped element, so that the wrench extends into the locking hole of the rotary lock, and the machine tool is used for autorotation, so that the wrench can perform the back-and-forth test of opening and locking the rotary lock; the utility model discloses the uniformity is good, and the accuracy is high, and the good reliability replaces the manual work completely to carry out the durability test, has practiced thrift the cost, has improved efficiency.
Drawings
Fig. 1 is a side view of the present invention;
fig. 2 is a top view of the present invention;
FIG. 3 is a cross-sectional view of the rotary lock held by the present invention;
FIG. 4 is a side view of the rotary lock held by the present invention;
FIG. 5 is an isometric view of the rotary lock held by the present invention;
fig. 6 is a schematic structural view of an adjusting mechanism of the rotary lock held by the present invention;
FIG. 7 is a schematic view of the locking bar of the rotary lock of the present invention;
fig. 8 is a schematic structural view of the rotary lock fixing plate clamped by the present invention.
Wherein: 1. a lock lever; 2. a lock body mechanism; 3. a housing; 4. a transmission rod; 5. a first blind hole; 6. a second blind hole; 7. a clamping rod; 8. a limiting groove; 9. a rotating body; 10. a latch bolt; 11. a lock hole; 12. an adjustment mechanism; 13. a fixing plate; 14. a ratchet wheel; 15. a third blind hole; 16. a third spring; 17. a ball bearing; 18. a window; 19. a limiting body; 20. a first spring; 21. a second spring; 22. a circular groove; 23. a through hole; 24. a protrusion; 25. a strip-shaped groove; 26. a limiting plate; 27. a vertical plate; 28. a lower flat plate; 29. a machine tool; 30. an upper flat plate; 31. clamping a plate; 32. mounting holes; 33. a wrench; 34. a threaded hole; 35. positioning the bolt; 36. a pre-tightening force spring; a tee.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses a with centre gripping rotating lock, consequently do not restrict the structure of rotating lock, mention a rotating lock below and explain, as shown in fig. 3-5, this rotating lock includes locking lever 1 and lock body mechanism 2, as shown in fig. 7, locking hole 11 has been seted up to one end of locking lever 1, the other end of locking lever 1 is installed on aircraft body frame through adjustment mechanism 12, lock body mechanism 2 is installed on the lower part arcwall face of radome, and set up with adjustment mechanism 12 relatively, locking hole 11 of locking lever 1 is used for lock body mechanism 2 to penetrate or wear out, when lock body mechanism 2 penetrates locking hole 11, just pull lock body mechanism 2, make lock body mechanism 2 can not pull out; when the lock body mechanism 22 passes through the lock hole 11, the lock body mechanism 2 is released, so that the lock body mechanism 2 and the lock bar 1 are separated from each other, and the rotary lock is unlocked.
The clamping rod 7 is perpendicular to the transmission rod 4, the free end of the clamping rod 7 is used for limiting the transmission rod 4, a second spring 21 is arranged in the second blind hole 6 and between the end portion of the clamping rod 7 and the shell 3, the second spring 21 is used for abutting against the clamping rod 7, a limiting groove 8 is formed in the side wall close to the upper end of the transmission rod 4 and is inwards recessed, and the limiting groove 8 is used for the clamping rod 7 to stretch into and limit the transmission rod 4. Still be provided with the latch fitting in the casing 3, the latch fitting comprises tongue 10 and rotor 9 that a body coupling, and set up from top to bottom, has seted up the transmission hole along the vertical running through of the central line of rotor 9, and transfer line 4 passes through the transmission hole and installs on rotor 9. When the rotary lock is opened and locked, the lower end of the transmission rod 4 is inserted through a special tool, the transmission rod 4 is pushed to move upwards, the clamping rod 7 is separated from the limiting groove 8, the special tool is rotated to drive the transmission rod 4 to rotate, and further the rotating body 9 is driven to rotate, so that the lock tongue 10 penetrates into or penetrates out of the lock hole 11 of the lock rod 1 to complete unlocking and locking, and the clamping rod 7 automatically resets after locking and enters the limiting groove 8 to complete locking.
As shown in fig. 6, the adjusting mechanism 12 includes a fixing plate 13 and a ratchet 14 installed on the fixing plate 13, the ratchet 14 is perpendicular to the locking rod 1, and the inner edge of the ratchet 14 is in threaded connection with the other end of the locking rod 1, a window 18 is formed in the fixing plate 13 and corresponding to the side of the ratchet 14, the window 18 is used for an external wrench to extend into the ratchet 14 to rotate, and further the length of the locking rod 1 extending out of the fixing plate 13 is adjusted, so that the magnitude of the locking force is adjusted, and the fixing plate 13 is used for fixing the adjusting mechanism 12 on the aircraft body frame through a bolt.
As shown in fig. 8, a circular groove 22 is formed on one side of the plate surface of the fixing plate 13 and is communicated with the window 18, the circular groove 22 is used for placing the ratchet 14, a through hole 23 is formed on the other side of the plate surface of the fixing plate 13 in a penetrating manner, the through hole 23 and the circular groove 22 are coaxially formed, and the through hole 23 is used for enabling the other end of the lock rod 1 to extend into and penetrate through the through hole 23 to be in threaded connection with the inner edge of the ratchet 14.
Be provided with arch 24 on the through-hole 23 inner wall of fixed plate 13, on the outer wall of locking lever 1, set up bar groove 25 along its trend, arch 24 and bar groove 25 mutually support and restrict locking lever 1 and rotate. A third blind hole 15 is formed in the inner wall of the circular groove 22 of the fixing plate 13, a third spring 16 and a ball 17 are placed in the third blind hole 15, the ball 17 is located on the third spring 16 and in an area between two gears of the ratchet 14, and the ball 17 is used for limiting the ratchet 14.
The side of the fixing plate 13 provided with the circular groove 22 is further provided with a limiting plate 26 with a central opening, the inner edge of the ratchet 14 extends to the side away from the lock hole 11 to form an annular limiting body 19, that is, the limiting body 19 is integrally connected with the ratchet 14, and the limiting body 19 is used for extending into the opening of the limiting plate 26, so that the ratchet 14 is located between the limiting plate 26 and the fixing plate 13 and is fixed.
The utility model discloses a anchor clamps for testing rotatory lock durability, as shown in fig. 1 and 2, including vertical plate 27, the level of vertical setting to lower dull and stereotyped 28 and upper flat board 30, the cardboard 31 of vertical setting that sets up, lower dull and stereotyped 28 passes through the bolt fastening on lathe 29, lower dull and stereotyped 28 is located the downside of vertical plate 27, the left end of lower dull and stereotyped 28 and the lower extreme fixed connection of vertical plate 27, upper flat board 30 is located the upside of vertical plate 27, the left end of upper flat board 30 and the upper end fixed connection of vertical plate 27, upper flat board 30, vertical plate 27, lower dull and stereotyped 28 mutually support and form C-shaped spare, the inner chamber of C-shaped spare is used for holding lock body mechanism 2; the lower plate 28 is used for the machine tool 29 to rotate, so that the wrench 33 rotates the lock body mechanism 2 to perform reciprocating movement of locking and unlocking.
The utility model also comprises a clamping plate 31, the clamping plate 31 is positioned between the lower flat plate 28 and the upper flat plate 30 and outside the inner cavity of the C-shaped piece, a fixing hole is arranged on the clamping plate 31 in a penetrating way, and the fixing hole is used for fixing the adjusting mechanism 12 of the rotary lock; the adjusting mechanism 12 is used for fixing the lock rod 1, the upper plate 30 is provided with a mounting hole 32 in a penetrating manner, the mounting hole 32 is matched with the rotating body 9 of the rotary lock, the mounting hole 32 is used for enabling a wrench 33 to extend into the center position of the rotating body 9 of the rotary lock, and the center position at the moment refers to the lower end of the transmission rod 4, so that the rotary lock is opened or locked.
A plurality of threaded holes 34 are formed in the upper plate 30 around the mounting hole 32, and each threaded hole 34 is used for fixing the lock body mechanism 2 of the rotary lock below the upper plate 30 through a bolt. Because the lower bottom surface of the shell 3 of the rotary lock is arc-shaped and is adapted to the lower arc-shaped surface of the radome, moreover, the upper flat plate 30 is used for being mutually attached to the lower bottom surface of the shell 3, and the shell 3 is fixed below the upper flat plate 30, then firstly, a plurality of threaded holes 34 need to be formed in the upper flat plate 30, so that the rotary lock is fixed, and the lower bottom surface of the upper flat plate 30 is curved and is mutually adapted to the lower bottom surface of the shell 3, so that the lower bottom surface of the shell 3 is ensured to be mutually matched with the lower bottom surface of the upper flat plate 30, and the rotary lock is better fixed.
The clamping plate 31 is provided with two fixing holes, the two fixing holes are used for fixing the adjusting mechanism 12 on the clamping plate 31 by bolts, and the adjusting mechanism 12 is positioned on the left side plate surface of the clamping plate 31, because the rotary lock of the type is composed of the adjusting mechanism 12 and the lock body mechanism 2 which are separated from each other, the two mechanisms are not integrated, therefore, after the lock body mechanism 2 is fixed below the upper flat plate 30, the adjusting mechanism 12 needs to be fixed, and the fixing position of the adjusting mechanism 12 corresponds to the lock body mechanism 2, therefore, by fixing the adjusting mechanism 12 on the clamping plate 31, namely, the adjusting mechanism 12 is fixed on the left side plate surface of the clamping plate 31 by two bolts in the two fixing holes on the clamping plate 31, the lock rod 1 of the adjusting mechanism 12 is convenient to extend into the lock body mechanism 2, so that the lock tongue 10 of the lock body mechanism 2 penetrates into or out of the lock hole 11 at the free end of the lock, and then the durability test of repeated locking and unlocking is completed.
The vertical plate 27 is provided with two positioning holes, and the two positioning holes are used for fixing the clamping plate 31 fixed with the adjusting mechanism 12 on the vertical plate 27 from right to left horizontally by the positioning bolts 35. After fixing adjustment mechanism 12 on cardboard 31, need fix cardboard 31 this moment again on vertical plate 27, and then make cardboard 31, vertical plate 27, go up dull and stereotyped 30, lower dull and stereotyped 28 mutually support and carry out holistic fixed with lock body mechanism 2 and the adjustment mechanism 12 of rotatory lock, and then make lathe 29 drive whole device and carry out the rotation to this accomplishes subsequent durability test.
Two positioning bolts 35 are all sleeved with pretightening force springs 36, and each pretightening force spring 36 is used for providing pretightening force between the lock body mechanism 2 and the adjusting mechanism 12 of the rotary lock. Because the rotary lock is basically used on the airplane, the requirement of the airplane on the gap of the rotary lock is high, a sealing ring is inevitably installed at the peripheral gap after the rotary lock is installed, the sealing ring mainly plays a sealing effect at the moment, after the rotary lock is installed, because of the existence of the sealing ring, the lock body mechanism 2 and the adjusting mechanism 12 mutually generate mutual counter force, namely pretightening force, and the pretightening force spring 36 is arranged in the clamp to provide pretightening force for the lock body mechanism 2 and the adjusting mechanism 12 so as to simulate the counter force in real use, wherein the pretightening force of the pretightening force spring 36 is 250N.
Fixedly connected with cross section is T shape's T shape 37 on the lower face of lower flat plate 28, T shape 37's vertical section is last, the horizontal section is under, T shape 37's vertical section is used for stretching into the spacing inslot on lathe 29, make lathe 29 drive anchor clamps to carry out the rotation, this anchor clamps can be fixed on lathe 29 through other instruments, but at the continuous rotation in-process of lathe 29, anchor clamps still produce the displacement easily, consequently, except that this anchor clamps of other instrument fixed, still set up T shape 37 at the lower face of lower flat plate 28, T shape 37 can stretch into the spacing inslot of lathe 29 through its horizontal section, consequently, in the in-process of lathe 29 drive anchor clamps rotation, T shape 37 can avoid anchor clamps to produce the position, guarantee the normal clear of durability test.
The utility model discloses a vertical plate 27, lower flat plate 28, last flat plate 30, cardboard 31 mutually support and constitute C shape spare, fix the inner chamber at C shape spare with rotatory lock for whole rotatory lock and anchor clamps are located between 29 platforms of lathe and 29's of lathe spanner 33, and then spanner 33 stretches into the keyhole of rotatory lock, utilizes lathe 29 to carry out the rotation, makes spanner 33 open and the test of coming and going of locking to the rotational lock. The utility model discloses the uniformity is good, and the accuracy is high, and the good reliability replaces the manual work completely to carry out the durability test, has practiced thrift the cost, has improved efficiency.
The utility model discloses experimental requirement in the test process:
the 1 time of opening and locking is 1 operation cycle, and 10000 times of opening and locking operation cycles are completed under the condition of no maintenance. The test frequency is 4 times/min, and a pre-tightening force load of 250N is applied during the test.
The utility model discloses well lathe 29 is digit control machine tool 29, locks the rotation of 29 machining center main shafts of lathe, and reciprocating motion, programming about only accomplishing of main shaft: the spindle is inserted into a square hole at the lower end of a transmission rod 4 of the rotary lock downwards by 7mm, the turntable, namely a platform of a machine tool 29, starts to rotate clockwise by 180 degrees, and the spindle moves upwards by 16mm to complete unlocking; the main shaft moves downwards by 16mm again, the rotary table rotates anticlockwise by 180 degrees, the main shaft moves upwards by 16mm to complete locking, the machining center automatically counts for 1 time, and the subsequent locking and unlocking cycle is completed to automatically accumulate and count. The rotating speed of the rotary table is 180 degrees clockwise and anticlockwise for 4 times per minute, 250N pretightening force is applied by compression of the pretightening force spring 36 in the locking process, and 10000 times of locking and unlocking circulation tests are completed.
Claims (6)
1. A fixture for testing the durability of a rotary lock, comprising:
a vertical plate (27) which is vertically arranged,
a lower flat plate (28) which is horizontally arranged, is fixed on a machine tool (29) through a bolt, is positioned at the lower side of the vertical plate (27), and the left end of the lower flat plate is fixedly connected with the lower end of the vertical plate (27),
the upper flat plate (30) is horizontally arranged and located on the upper side of the vertical plate (27), the left end of the upper flat plate is fixedly connected with the upper end of the vertical plate (27), the upper flat plate (30), the vertical plate (27) and the lower flat plate (28) are matched with each other to form a C-shaped part, and the inner cavity of the C-shaped part is used for accommodating a rotary lock;
the clamping plate (31) is vertically arranged and located between the lower flat plate (28) and the upper flat plate (30) and outside the inner cavity of the C-shaped part, a fixing hole penetrates through the clamping plate (31), the fixing hole is used for fixing the adjusting mechanism (12) of the rotary lock on the left side plate surface of the clamping plate (31), and the adjusting mechanism (12) is used for fixing the lock rod (1);
wherein, go up and run through on dull and stereotyped (30) and seted up mounting hole (32), mounting hole (32) suit with rotor (9) of rotatory lock, mounting hole (32) are used for spanner (33) to stretch into rotor (9) lower extreme of rotatory lock, lower flat board (28) are used for lathe (29) to drive its rotation for bolt (10) that spanner (33) rotated lock body mechanism (2) carry out the locking and the back and forth movement of opening.
2. The fixture for testing the durability of a rotary lock according to claim 1, wherein the upper plate (30) is provided with a plurality of threaded holes (34) around the mounting hole (32), and each threaded hole (34) is used for fixing the lock body mechanism (2) below the upper plate (30) through a bolt.
3. The clamp for testing the durability of the rotary lock as recited in claim 1, wherein the vertical plate (27) is provided with two positioning holes, and the two positioning holes are used for horizontally fixing the positioning bolt (35) from right to left and fixing the clamping plate (31) fixed with the adjusting mechanism (12) on the vertical plate (27).
4. The clamp for testing the durability of the rotary lock according to claim 3, wherein a pre-tightening force spring (36) is sleeved on each of the two positioning bolts (35), and each pre-tightening force spring (36) is used for providing pre-tightening force between the lock body mechanism (2) and the adjusting mechanism (12).
5. The clamp for testing the durability of the rotary lock according to any one of claims 1 to 4, wherein a T-shaped part (37) with a T-shaped cross section is fixedly connected to the lower plate surface of the lower flat plate (28), the vertical section of the T-shaped part (37) is arranged at the upper part and the transverse section of the T-shaped part are arranged at the lower part, and the vertical section of the T-shaped part (37) is used for extending into a limiting groove on a machine tool (29) so that the machine tool (29) drives the clamp to rotate.
6. A clamp for testing the durability of a rotary lock according to claim 5, wherein the lower bottom surface of the upper plate (30) is curved and conforms to the lower bottom surface of the rotary lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020860826.6U CN211954645U (en) | 2020-05-21 | 2020-05-21 | Clamp for testing durability of rotary lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020860826.6U CN211954645U (en) | 2020-05-21 | 2020-05-21 | Clamp for testing durability of rotary lock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211954645U true CN211954645U (en) | 2020-11-17 |
Family
ID=73170910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020860826.6U Active CN211954645U (en) | 2020-05-21 | 2020-05-21 | Clamp for testing durability of rotary lock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211954645U (en) |
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2020
- 2020-05-21 CN CN202020860826.6U patent/CN211954645U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A fixture for testing the durability of rotary lock Effective date of registration: 20221130 Granted publication date: 20201117 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: Xi'an alite Aviation Technology Co.,Ltd. Registration number: Y2022610000785 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231026 Granted publication date: 20201117 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: Xi'an alite Aviation Technology Co.,Ltd. Registration number: Y2022610000785 |