CN111157231A - Quick loading and releasing device in testing device - Google Patents
Quick loading and releasing device in testing device Download PDFInfo
- Publication number
- CN111157231A CN111157231A CN202010117124.3A CN202010117124A CN111157231A CN 111157231 A CN111157231 A CN 111157231A CN 202010117124 A CN202010117124 A CN 202010117124A CN 111157231 A CN111157231 A CN 111157231A
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- loading
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- mounting seat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a quick loading and releasing device in a test device, which comprises a servo actuator cylinder, an actuator cylinder mounting seat, a mobile loading device and a horizontal mobile mounting seat, wherein the servo actuator cylinder is arranged on the servo actuator cylinder mounting seat; the movable loading device comprises a loading head, a unhook, a transmission assembly, a locking device and a rotational inertia compensation assembly, wherein the unhook, the transmission assembly, the locking device and the rotational inertia compensation assembly are assembled on the loading head; the servo actuating cylinder is arranged on the actuating cylinder mounting seat and connected with the loading head. During testing, the undercarriage ejection rod is locked with the unhooking rod, and the locking device enables the unhooking rod to be locked; loading a servo actuator cylinder; the locking device is unlocked, the ejection rod is quickly separated from the unhooking rod, and meanwhile the rotational inertia compensation assembly works to compensate the loss of the unhooking rotational inertia.
Description
Technical Field
The invention belongs to the technical field of simulation equipment in a sample device, and particularly relates to a quick loading and releasing device in a test device.
Background
At present, when the ejection rod of the landing gear is loaded and a function test of quick release is achieved, a corresponding simulation device is lacked, and when the conventional simulation test is commonly used, under the condition of bearing 120T loading, the release time is over 30ms, the release time is too long, and the ejection of the ejection rod is influenced to a certain extent in the release process.
Disclosure of Invention
The invention aims to provide a quick loading and releasing device in a testing device, which can be quickly released and does not influence an ejection rod, aiming at the defects of the prior art.
The invention provides a quick loading and releasing device in a test device, which comprises a servo actuator cylinder, an actuator cylinder mounting seat, a movable loading device and a horizontal movable mounting seat, wherein the servo actuator cylinder is arranged on the servo actuator cylinder mounting seat; the movable loading device comprises a loading head, a unhook, a transmission assembly, a locking device and a rotational inertia compensation assembly, wherein the unhook, the transmission assembly, the locking device and the rotational inertia compensation assembly are assembled on the loading head; the actuating cylinder mounting seat is assembled on the foundation, the horizontal moving mounting seat is arranged on the foundation, one end of the horizontal moving mounting seat is detachably connected with the actuating cylinder mounting seat, and the servo actuating cylinder is arranged on the actuating cylinder mounting seat and connected with the loading head so as to drive the moving loading device to move on the horizontal moving mounting seat relative to the actuating cylinder mounting seat.
The loading head comprises a guide bottom plate, vertical plates, a connecting plate and a loading pin shaft, wherein the guide bottom plate is a rectangular plate, three through holes are formed in the vertical plates along the length direction of the vertical plates, the vertical plates are oppositely arranged on the bottom plate, the loading pin shaft is assembled in the through holes in one ends of the vertical plates, and the connecting plate is connected between the two vertical plates.
The unhook comprises an eccentric wheel and a wheel shaft, a groove is formed in the eccentric wheel, splines are arranged at two ends of the wheel shaft, the unhook is installed at a through hole in the end portion of one end of the vertical plate through the wheel shaft, two ends of the wheel shaft extend out of the vertical plate, and a volute spiral spring is arranged at one end of the wheel shaft and used for resetting.
The rotational inertia compensation assembly comprises a loading cylinder, a force application rod and a support; the cylinder body of the loading cylinder is hung outside the side plate, the support is erected on the guide bottom plate, the stressing rod is hinged on the support, one end of the stressing rod is connected with the piston rod of the loading cylinder, and the other end of the stressing rod is connected with the transmission assembly; the locking device is an electromagnetic clutch and is arranged in a through hole in the middle of the vertical plate, and the main shaft extends out of the vertical plate and is in key connection with the transmission assembly.
The transmission assembly comprises a swing rod and a cam; the swing rod is a conical rod, a key groove is formed in the large end of the swing rod to be connected with the wheel shaft, and a claw groove is formed in the small end of the swing rod; a key groove is formed in a wheel body of the cam to be connected with a main shaft of the locking device, and a pawl is arranged outside the wheel body to be meshed with the swing rod; the transmission assembly and the rotational inertia compensation assembly are provided with two sets and are respectively arranged at two ends of the locking device.
The guide bottom plate is located below the swing rod, and a limit stop is arranged on the top surface of the limit stop.
And a reset cylinder is arranged between the cam and the vertical plate.
The horizontal moving installation seat comprises a base, an end plate, a rib plate, a guide rail installation seat and a linear guide rail; the top edge of the end plate is provided with a semicircular groove, and the end part of the guide rail mounting seat is provided with a limiting block; the end plate is fixedly connected outside one end of the base in the length direction, the rib plate is fixedly connected to the base through the bottom surface of the rib plate, one end of the rib plate is welded with the end plate, the guide rail mounting seat is connected to the base and aligned with the rib plate, the linear guide rail is assembled on the guide rail mounting seat, and the tail end of the linear guide rail is contacted with the limiting block; the loading head is assembled on the linear guide rail through a sliding block.
The actuating cylinder mounting seat is in a cuboid shape, and an oil cylinder flange plate is arranged at the center of the actuating cylinder mounting seat; the servo actuating cylinder is a hydraulic cylinder, and a mounting flange is arranged outside the cylinder body; the servo actuating cylinder is connected to the oil cylinder flange plate through a mounting flange, and the piston rod penetrates through the actuating cylinder mounting seat and is connected with the loading pin shaft through a loading joint.
The piston rod of the actuating cylinder mounting seat is externally provided with threads, and the piston rod is externally provided with a limit nut; the outer end of the piston rod is in threaded connection with a pull pressure sensor, and the other end of the pull pressure sensor is connected with the loading joint.
During testing, the servo actuator cylinder works to pull the movable loading device to be unhooked to an initial position; secondly, pressing down an ejection rod of the undercarriage to be locked with the unhooking, controlling a locking device to act to limit the rotational freedom degree of the unhooking, and enabling the unhooking to be in a locking state; then loading the servo actuator cylinder to a set stroke, loading the ejection rod of the undercarriage, and stopping loading after meeting the test requirement of the horizontal loading force; then the rotational freedom degree of the locking device for unlocking the unhook is controlled, the ejection rod is quickly separated from the unhook, and meanwhile, the rotational inertia compensation assembly works to compensate the loss of the rotational inertia of the unhook; after the simulation is completed, the ejection rod is released, the servo actuator cylinder is controlled to reset, the unhooking reset is carried out, and the next test is prepared. The quick release function is achieved by the cooperation of the locking device, the unhooking device and the rotational inertia compensation assembly, i.e. the quick release can be carried out in a very short time when the rated torque is reached.
Drawings
FIG. 1 is an axial schematic view of a preferred embodiment of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is an enlarged perspective view of the actuator mount of the preferred embodiment.
Figure 4 is an enlarged sectional view of the actuator mount of the preferred embodiment.
Fig. 5 is an exploded view of the horizontally movable mount in the preferred embodiment.
Fig. 6 is an exploded view of the mobile loading unit in the preferred embodiment.
Fig. 7 is an enlarged perspective view of the loading head in the preferred embodiment. (Loading pin not shown)
Fig. 8 is an enlarged perspective view of the unhooking in the preferred embodiment.
Fig. 9 is a schematic view of the assembly of the mobile loading unit and the horizontal movement mounting base in the preferred embodiment.
Sequence numbers of the drawings:
1-an installation seat of an actuating cylinder,
11-bottom plate, 12-front plate, 13-side plate, 14-rear plate, 15-top plate, 16-steel pipe, 17-oil cylinder flange, 18-triangular rib, 19-reinforcing rib;
2-horizontally moving the mounting seat,
21-a base, 22-an end plate, 23-a rib plate, 24-a guide rail mounting seat, 25-a linear guide rail, 26-a limiting seat and 27-a reinforcing rib plate;
3-a servo actuator cylinder, which is provided with a servo actuator cylinder,
31-a mounting flange, 32-a threaded section, 33-a limiting nut and 34-an operating rod;
4-pulling pressure sensor;
5-loading the joint;
6-moving the loading device to move the loading device,
61-loading head, 611-guiding bottom plate, 612-vertical plate, 613-connecting plate, 614-loading pin shaft,
62-unhooking, 621-eccentric wheel, 622-wheel shaft,
63-transmission component, 631-swing link, 632-cam,
64-a locking device, which is provided with a locking device,
65-rotational inertia compensation component, 651-loading cylinder, 652-forcing rod, 653-support,
66-spring seat, 67-scroll spring, 68-limit stop, 69-reset cylinder;
7-a slide block mounting plate;
8, a sliding block.
Detailed Description
As shown in fig. 1 and fig. 2, the quick loading and releasing device in the testing apparatus disclosed in this embodiment includes a ram mounting base 1, a horizontal moving mounting base 2, a servo ram 3, a pull pressure sensor 4, a loading joint 5, and a moving loading device 6; the actuator cylinder mounting seat and the horizontal moving mounting seat are respectively arranged on the foundation, and one end of the horizontal moving mounting seat is connected with the actuator cylinder mounting seat; the servo actuator cylinder is arranged at the axis of the actuator cylinder mounting seat, the mobile loading device is arranged on the horizontal mobile mounting seat, and the servo actuator cylinder and the horizontal mobile mounting seat are connected through a pull pressure sensor and a loading joint.
As shown in fig. 3 and 4, the actuator mount 1 is a fabricated base, and includes a bottom plate 11, a front plate 12, side plates 13, a rear plate 14, and a top plate 15. The front plate is a concave plate, and the periphery of the front plate is provided with mounting holes; the bottom plate is a rectangular plate, and a circle of mounting holes are formed in the periphery of the bottom plate; the center positions of the front plate and the rear plate are both provided with through holes. When assembling, welding the front plate outside the bottom plate; vertically welding a pair of side plates on a bottom plate, welding the front side of the side plates with a front plate, and leaving mounting holes in the front plate and the bottom plate outside the side plates; the rear plate is erected on the bottom plate and is welded after being abutted against the side plate, and the leakage of the mounting hole in the bottom plate is ensured; the welding top plate is enclosed into a cuboid box body, and each mounting hole is positioned outside the box body so as to be mounted with the outside. Steel pipes 16 are arranged in through holes of the front plate and the rear plate in the box body, oil cylinder flanges 17 are arranged at corresponding positions outside the rear plate so as to be convenient for mounting the servo actuating cylinders 3, triangular ribs 18 are additionally arranged among the plates outside the box body, and reinforcing ribs 19 are additionally arranged among the steel pipes and the plates so as to ensure that the strength of the seat body meets the test requirements. After the actuator cylinder mounting seat 1 is mounted on a foundation through the bottom plate, the horizontal moving mounting seat 2 is placed on the foundation and locked with the front plate 12.
As shown in fig. 5, the horizontal movement mounting base 2 is an L-shaped base body, and includes a base 21, an end plate 22, a rib plate 23, a guide rail mounting base 24, and a linear guide rail 25. Wherein the base 21 is a rectangular base body; the end plate 22 is a rectangular plate, the top edge of the end plate is provided with a semicircular notch matched with a piston rod of the supporting servo actuating cylinder 3, and two sides of the end plate are provided with mounting holes to be assembled with an actuating cylinder mounting seat; the rib plate 23 is a right-angle trapezoidal plate. During assembly, the end plate is welded outside the base, the pair of rib plates are arranged in parallel, the vertical edge is welded with the base, and the lower bottom is welded with the end plate; aligning a pair of guide rail mounting seats 24 with corresponding rib plates and connecting the guide rail mounting seats to the base; assembling the linear guide rail on a guide rail mounting seat, and arranging a limiting seat 26 at the end part of the guide rail mounting seat close to the rib plate to prevent the mobile loading device 6 from sliding out; finally, reinforcing rib plates 27 are arranged between the pair of guide rail mounting seats and between the guide rail mounting seats and the base to ensure the strength.
And after the actuator cylinder mounting seat 1 and the horizontal moving mounting seat 2 are arranged, the actuator cylinder 3 is servo-actuated. In this embodiment, the servo actuator cylinder 3 is a hydraulic cylinder, as shown in fig. 1 and 2, a mounting flange 31 is provided outside the cylinder body, the end section of the piston rod is a threaded section 32, a limit nut 33 is connected to the external thread of the mounting flange, an operating rod 34 is provided outside the limit nut 33 for operation, and the stroke of the piston rod is adjusted by adjusting the relative position of the limit nut and the piston rod. During assembly, the servo actuator cylinder is connected with an oil cylinder flange on the actuator cylinder mounting seat through a mounting flange, the threaded section of the piston rod penetrates through the semicircular notch on the end plate of the horizontal moving mounting seat and then is connected with one end of the pull pressure sensor 4 in a threaded manner, and the other end of the pull pressure sensor 4 is connected with the rod part of the loading joint 5. The other end of the loading joint 5 is hung on a lug and sleeved on a loading pin shaft of the movable loading device 6.
As shown in fig. 1 and 6, the mobile loading device 6 includes a loading head 61, a release hook 62, a transmission assembly 63, a locking device 64, and a rotational inertia compensation assembly 65.
As shown in fig. 6 and 7, the loading head 61 includes a guide bottom plate 611, a vertical plate 612, a connecting plate 613, and a loading pin 614. The guide bottom plate is a rectangular plate; three through holes are formed in the vertical plates along the length direction of the vertical plates, and the pair of vertical plates are oppositely arranged on the bottom plate; the two ends of the loading pin shaft are provided with stop grooves, the loading pin shaft is assembled in a through hole at one end of the vertical plate, and the outer part of the vertical plate is clamped into a blocking piece of the stop groove to limit the rotation of the loading pin shaft; the connecting plate is connected between the two vertical plates; the unhooking device 62 is arranged in the through hole at the other end of the vertical plate; the lock 64 is mounted in the central through hole.
As shown in fig. 8, the unhook 62 includes an eccentric wheel 621 and a wheel shaft 622, the eccentric wheel is provided with a groove, splines are provided outside two ends of the wheel shaft, the unhook is mounted on the vertical plate by the wheel shaft and can rotate around the axis thereof, two ends of the wheel shaft extend outside the side plate, a spring seat 66 is provided outside one end of the wheel shaft, and a spiral spring 67 is mounted in the spring seat for resetting.
The locking device 64 adopts a normally open jaw electromagnetic clutch, the model of the normally open jaw electromagnetic clutch is GDFP-258, the normally open jaw electromagnetic clutch is electrified, the normally open jaw electromagnetic clutch is closed, the normally open jaw electromagnetic clutch is disconnected, the maximum torque is 6000Nm, and main shafts at two ends of the locking device respectively extend out of the vertical plate and are connected with a 63-key transmission assembly.
The transmission assembly 63 comprises a swing rod 631 and a cam 632; the swing rod is a conical rod, a key groove is formed in the large end of the swing rod to be connected with a wheel axle key, and a claw groove is formed in the small end of the swing rod; a key groove is formed in a wheel body of the cam 632 to be connected with a main shaft key of the locking device, and a pawl is arranged outside the wheel body to be meshed with the swing rod; and is connected to the swing link by a moment of inertia compensation assembly 65 to compensate for loss of moment of inertia during the test. The pair of transmission assemblies 63 are respectively arranged on two sides of the loading head and connected to two ends of the unhooking wheel shaft and two stages of the locking devices. A limit stop 68 is arranged on the guide bottom plate in the area below the swing rod, and a cushion pad is arranged on the top surface of the limit stop to limit the swing angle of the swing rod and prevent rigid collision from damaging all parts; a reset cylinder 69 is additionally arranged between the cam on one side and the vertical plate to control unhooking reset after release is finished.
Rotational inertia compensation assembly 65 includes a load cylinder 651, a boost lever 652, and a pedestal 653; the cylinder body of the loading cylinder is hung outside the vertical plate, the support is erected on the guide bottom plate, the stressing rod is hinged on the support, one end of the stressing rod is connected with the piston rod of the loading cylinder, and the other end of the stressing rod is connected with the swing rod; during testing, the piston rod of the loading cylinder moves downwards to enable the stress application rod to rotate around the support, the swing rod is pried to compensate for loss of rotational inertia of the unhooking in the testing process, and the ejection rod is guaranteed to be rapidly separated from the unhooking. The rotational inertia compensation assembly 65 is provided in a kit with the drive assembly.
As shown in fig. 9, when the mobile loading device 6 is assembled with the horizontal movement mounting base 2, the sliding block mounting plate 7 is arranged below the guide bottom plate, the sliding block mounting plate 7 is provided with four sliding blocks 8, and each sliding block is clamped outside the linear guide rail, so that the mobile loading device can slide, and the sliding blocks can also bear the vertical force together with the horizontal movement mounting base while sliding is guaranteed.
When the test is carried out in the embodiment, the servo actuating cylinder works to pull the movable loading device to be unhooked to the initial position; secondly, pressing down an ejection rod of the undercarriage to be locked with the unhook, electrifying the electromagnetic clutch at the moment, limiting the rotation freedom degree of the unhook in an attraction state, and keeping the unhook in a locking state; then loading the servo actuator cylinder to a set stroke, loading the ejection rod of the undercarriage, and stopping loading after meeting the test requirement of the horizontal loading force; then the electromagnetic clutch is powered off and separated, the limitation on the rotational freedom degree of unhooking is removed, meanwhile, a loading cylinder of the rotational inertia compensation assembly is loaded, a piston rod moves downwards to compensate the loss of unhooking rotational inertia, and the ejection rod and the unhooking are ensured to be quickly separated; a test procedure was completed. And after the ejection rod is released, the servo actuator cylinder is controlled to reset, and the unhooking reset is carried out to prepare for the next test. The quick release function is achieved by the cooperative operation of the locking device, the unhooking device and the rotational inertia compensation assembly, namely, the quick release can be carried out within 3ms under the condition that the rated torque is achieved.
Claims (10)
1. A quick loading and releasing device in a testing device is characterized in that: the device comprises a servo actuator cylinder, an actuator cylinder mounting seat, a mobile loading device and a horizontal mobile mounting seat;
the movable loading device comprises a loading head, a unhook, a transmission assembly, a locking device and a rotational inertia compensation assembly, wherein the unhook, the transmission assembly, the locking device and the rotational inertia compensation assembly are assembled on the loading head;
the actuating cylinder mounting seat is assembled on the foundation, the horizontal moving mounting seat is arranged on the foundation, one end of the horizontal moving mounting seat is detachably connected with the actuating cylinder mounting seat, and the servo actuating cylinder is arranged on the actuating cylinder mounting seat and connected with the loading head so as to drive the moving loading device to move on the horizontal moving mounting seat relative to the actuating cylinder mounting seat.
2. A rapid load and release device in a test rig according to claim 1, wherein: the loading head comprises a guide bottom plate, vertical plates, a connecting plate and a loading pin shaft, wherein the guide bottom plate is a rectangular plate, three through holes are formed in the vertical plates along the length direction of the vertical plates, the vertical plates are oppositely arranged on the bottom plate, the loading pin shaft is assembled in the through holes in one ends of the vertical plates, and the connecting plate is connected between the two vertical plates.
3. A rapid load and release device in a test rig according to claim 2, wherein: the unhook comprises an eccentric wheel and a wheel shaft, a groove is formed in the eccentric wheel, splines are arranged at two ends of the wheel shaft, the unhook is installed at a through hole in the end portion of one end of the vertical plate through the wheel shaft, two ends of the wheel shaft extend out of the vertical plate, and a volute spiral spring is arranged at one end of the wheel shaft and used for resetting.
4. A rapid load and release device in a test rig according to claim 3, wherein: the rotational inertia compensation assembly comprises a loading cylinder, a force application rod and a support; the cylinder body of the loading cylinder is hung outside the side plate, the support is erected on the guide bottom plate, the stressing rod is hinged on the support, one end of the stressing rod is connected with the piston rod of the loading cylinder, and the other end of the stressing rod is connected with the transmission assembly; the locking device is an electromagnetic clutch and is arranged in a through hole in the middle of the vertical plate, and the main shaft extends out of the vertical plate and is in key connection with the transmission assembly.
5. The rapid load and release device in a testing apparatus according to claim 4, wherein: the transmission assembly comprises a swing rod and a cam; the swing rod is a conical rod, a key groove is formed in the large end of the swing rod to be connected with the wheel shaft, and a claw groove is formed in the small end of the swing rod; a key groove is formed in a wheel body of the cam to be connected with a main shaft of the locking device, and a pawl is arranged outside the wheel body to be meshed with the swing rod; the transmission assembly and the rotational inertia compensation assembly are provided with two sets and are respectively arranged at two ends of the locking device.
6. The rapid load and release device in a test rig according to claim 5, wherein: the guide bottom plate is located below the swing rod, and a limit stop is arranged on the top surface of the limit stop.
7. The rapid load and release device in a test rig according to claim 5, wherein: and a reset cylinder is arranged between the cam and the vertical plate.
8. A rapid load and release device in a test rig according to claim 1, wherein: the horizontal moving installation seat comprises a base, an end plate, a rib plate, a guide rail installation seat and a linear guide rail; the top edge of the end plate is provided with a semicircular groove, and the end part of the guide rail mounting seat is provided with a limiting block; the end plate is fixedly connected outside one end of the base in the length direction, the rib plate is fixedly connected to the base through the bottom surface of the rib plate, one end of the rib plate is welded with the end plate, the guide rail mounting seat is connected to the base and aligned with the rib plate, the linear guide rail is assembled on the guide rail mounting seat, and the tail end of the linear guide rail is contacted with the limiting block; the loading head is assembled on the linear guide rail through a sliding block.
9. A rapid load and release device in a test rig according to claim 2, wherein: the actuating cylinder mounting seat is in a cuboid shape, and an oil cylinder flange plate is arranged at the center of the actuating cylinder mounting seat; the servo actuating cylinder is a hydraulic cylinder, and a mounting flange is arranged outside the cylinder body; the servo actuating cylinder is connected to the oil cylinder flange plate through a mounting flange, and the piston rod penetrates through the actuating cylinder mounting seat and is connected with the loading pin shaft through a loading joint.
10. A rapid load and release device in a test rig according to claim 9, wherein: the piston rod of the actuating cylinder mounting seat is externally provided with threads, and the piston rod is externally provided with a limit nut; the outer end of the piston rod is in threaded connection with a pull pressure sensor, and the other end of the pull pressure sensor is connected with the loading joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117124.3A CN111157231A (en) | 2020-02-25 | 2020-02-25 | Quick loading and releasing device in testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010117124.3A CN111157231A (en) | 2020-02-25 | 2020-02-25 | Quick loading and releasing device in testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111157231A true CN111157231A (en) | 2020-05-15 |
Family
ID=70566418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010117124.3A Withdrawn CN111157231A (en) | 2020-02-25 | 2020-02-25 | Quick loading and releasing device in testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111157231A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2600128A (en) * | 2020-10-22 | 2022-04-27 | Anthony Best Dynamics Ltd | A test rig |
-
2020
- 2020-02-25 CN CN202010117124.3A patent/CN111157231A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2600128A (en) * | 2020-10-22 | 2022-04-27 | Anthony Best Dynamics Ltd | A test rig |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 410200 No. 279 Chigang Road, Wangcheng Economic and Technological Development Zone, Changsha City, Hunan Province Applicant after: Changsha Tianying Aviation Equipment Co., Ltd Address before: 410200 No. 279 Chigang Road, Wangcheng Economic and Technological Development Zone, Changsha City, Hunan Province Applicant before: CHANGSHA TIANYING MACHINERY MANUFACTURING Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200515 |
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| WW01 | Invention patent application withdrawn after publication |