CN205971884U - Can protect light fixed wing uavs of carry equipment - Google Patents
Can protect light fixed wing uavs of carry equipment Download PDFInfo
- Publication number
- CN205971884U CN205971884U CN201620999760.2U CN201620999760U CN205971884U CN 205971884 U CN205971884 U CN 205971884U CN 201620999760 U CN201620999760 U CN 201620999760U CN 205971884 U CN205971884 U CN 205971884U
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- Prior art keywords
- storehouse
- umbrella
- equipment
- main body
- fixed
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Abstract
The utility model discloses a can protect light fixed wing uavs of carry equipment. This unmanned aerial vehicle includes: the fuselage main part has been seted up in the fuselage main part and has been flown to control storehouse and umbrella storehouse, and the lower surface in the fuselage main part is seted up in the umbrella storehouse, the wing is connected in the outside of fuselage main part, flight control system sets up in flying to control the storehouse, carry equipment, carry are on unmanned aerial vehicle, and wherein, carry equipment has the component parts who stretches out fuselage main part lower surface downwards, and parachute and umbrella accuse equipment, the parachute sets up in the umbrella storehouse, and umbrella accuse equipment is connected with flight control system is electric for the control parachute leaves the umbrella storehouse and opens. Through the utility model provides an unmanned aerial vehicle when unmanned aerial vehicle falls down, can avoid carry equipment collision ground, has effectively protected carry equipment.
Description
Technical field
This utility model is related to unmanned air vehicle technique field, more particularly, to a kind of lightweight fixed-wing that can protect carry equipment
Unmanned plane.
Background technology
It is related in the application of image acquisition, the basis instrument planning of such as digital terrain modeling, such as mine etc, lean mineral deposit
Etc the reserves calculating of large ore deposit, planning and construction of the city, the vegetation detection in land reclamation or agricultural industry, and be related in real time
In the other application monitoring, carry fixed-wing unmanned plane just like monitoring devices such as video cameras using more and more universal.
In the fixed-wing unmanned plane of this kind of application, the unmanned plane that light material is made is because of its light weight, low cost, manufacture
The feature of the low and easy batch production of complexity, and be widely used.But, the lightweight fixed-wing unmanned plane of prior art is taken notice of
When falling outward, the video camera that it carries falls as well as body, and wherein, the photographic head of video camera is substantially more expensive, in pendant
When falling again easily direct collision ground and impaired, thus, lightweight fixed-wing unmanned plane of the prior art cannot be effectively protected
Photographic head.
Above-mentioned technical problem present in prior art, not yet proposes effective solution at present.
Utility model content
The purpose of this utility model is to provide a kind of lightweight fixed-wing unmanned plane that can protect carry equipment, when carry sets
Standby for camera head when, when unmanned plane falls, it can be avoided that photographic head collision ground, effective protection photographic head.
To achieve these goals, to provide a kind of lightweight fixed-wing that can protect carry equipment unmanned for this utility model
Machine.This unmanned plane includes：Fuselage main body, fuselage main body offers and flies control storehouse and umbrella storehouse, umbrella storehouse is opened under fuselage main body
Surface；Wing, is connected to the outside of fuselage main body；Flight control system, is arranged at and flies in control storehouse；Carry equipment, carry is in unmanned plane
On, wherein, carry equipment has the ingredient extending downwardly from fuselage main body lower surface；And parachute and umbrella control equipment, fall
The umbrella that falls is arranged in umbrella storehouse, and umbrella control equipment is electrically connected with flight control system, opens for controlling parachute to leave umbrella storehouse.
Further, umbrella storehouse is provided with Cang Gai, and the lower surface of fuselage main body is further opened with steering wheel storehouse；Umbrella control equipment includes setting
Interface arrangment inside the steering wheel being placed in steering wheel storehouse and the storehouse lid being fixed on umbrella storehouse, steering wheel is electrically connected with flight control system, steering wheel
Horn and interface arrangment clamping when umbrella storehouse storehouse cover buckle together on umbrella storehouse, umbrella storehouse when the horn of steering wheel is separated with interface arrangment
Cang Gai departs from umbrella storehouse.
Further, interface arrangment is the tetragonal body with groove, and the upper surface of tetragonal body is fixed in the storehouse lid in umbrella storehouse
One end of side, through two sides of tetragonal body, the side at the opening place of groove is near steering wheel, the opening institute of groove for groove
To side away from steering wheel, the second position that the horn of steering wheel has the primary importance to groove for the clamping and departs from groove.
Further, the other end inside the storehouse lid in umbrella storehouse is fixed with two fixed blocks, two fixed blocks and tetragonal body
Triangle fixing point, fixed block includes being fixed on fixed part and the projection protruding from fixed part that the storehouse in umbrella storehouse covers, umbrella
It is provided with the bulkhead in storehouse and accommodate raised groove.
Further, fuselage main body is further opened with equipment compartment, in the lower surface of fuselage main body, equipment compartment, steering wheel storehouse and
Umbrella storehouse sets gradually from front to back.
Further, the storehouse in umbrella storehouse covers and is provided with counter weight construction, and umbrella storehouse is arranged at the first half of fuselage main body.
Further, steering wheel storehouse is provided with Cang Gai, and in fuselage main body upper surface side, equipment compartment is provided with Cang Gai.
Further, carry equipment is camera head, and the photographic head of camera head extend out to fuselage main body from equipment compartment
Lower surface is shot.
Further, fuselage main body and wing are integrally formed by foam.
Further, it is embedded with carbon pipe in fuselage main body and wing.
This utility model includes fuselage by a kind of lightweight fixed-wing unmanned plane that can protect carry equipment, this unmanned plane
Main body and the wing in the outside being connected to fuselage main body, offer in fuselage main body and fly control storehouse and umbrella storehouse, set winged in winged control storehouse
Control system；Carry equipment is set, carry equipment has the ingredient extending downwardly from fuselage main body lower surface in equipment compartment；Umbrella storehouse is opened
It is located at the lower surface of fuselage main body, inside set parachute and umbrella control equipment, umbrella control equipment is electrically connected with flight control system, sends out in unmanned plane
When life is fallen, according to the control command of flight control system, parachute is controlled to leave umbrella storehouse and open, after parachute is opened, unmanned
Machine integrally can overturn, carry equipment extend downwardly from fuselage main body lower surface ingredient also can accordingly overturn supreme, unmanned
When machine lands, be not in this ingredient contact ground and impaired situation, be effectively protected carry equipment.
Brief description
The top view of the lightweight fixed-wing unmanned plane that Fig. 1 provides for the embodiment of the present application；
The upward view of the lightweight fixed-wing unmanned plane that Fig. 2 provides for the embodiment of the present application；
The schematic diagram of the umbrella control equipment of the lightweight fixed-wing unmanned plane that Fig. 3 provides for the embodiment of the present application；And
The schematic diagram of the fixed block of the lightweight fixed-wing unmanned plane that Fig. 4 provides for the embodiment of the present application.
The schematic diagram in the umbrella storehouse of the lightweight fixed-wing unmanned plane that Fig. 5 provides for the embodiment of the present application.
Description of reference numerals
10- fuselage main body；11- flies control storehouse；12- umbrella storehouse；13- equipment compartment；14- steering wheel storehouse；In the middle part of 15-；16- sidepiece；20-
Wing；30- umbrella control equipment；31- steering wheel；32- interface arrangment；33- horn；34- groove；35- fixed block；36- fixed part；37-
Raised.
Specific embodiment
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.But the use of these exemplary embodiments
Way and purpose are only used for this utility model is described, not real protection scope of the present utility model are constituted any type of any
Limit, more non-protection domain of the present utility model is confined to this.
In this utility model, in the case of not being specified to the contrary, the noun of locality such as " upper and lower " of use typically refers to
The lightweight fixed-wing unmanned plane that can protect carry equipment that this utility model provides defines under normal usage." interior,
Refer to outward " inside and outside with respect to each part profile of itself, these nouns of locality adopt for the ease of understanding, thus should not
Constitute the restriction to this utility model protection domain.
Suitably with reference to Fig. 1, for the lightweight fixed-wing unmanned plane that can protect carry equipment, fuselage main body 10 offers
Fly control storehouse 11 and umbrella storehouse 12, umbrella storehouse 12 is opened in the lower surface of fuselage main body 10；Wing 20 is connected to the outside of fuselage main body 10；
Flight control system is arranged at and flies in control storehouse 11；Carry hanging equipment is loaded on unmanned plane, and wherein, carry equipment has and extends downwardly from fuselage
The ingredient of main body 10 lower surface；And parachute and umbrella control equipment 30, parachute is arranged in umbrella storehouse 12, umbrella control equipment 30
Electrically connect with flight control system, open for controlling parachute to leave umbrella storehouse 12, for example, spring equipment, fall are set in umbrella storehouse orlop
When the umbrella that falls is arranged in umbrella storehouse, spring is in compressive state, and when needing parachute to open, umbrella control equipment controls spring by compressing
Condition conversion is free state to eject parachute.
Because parachute is arranged at the lower surface of fuselage main body, leave after umbrella storehouse opens in parachute, unmanned plane integrally can
Upset, the ingredient of the carry equipment under fuselage main body also can accordingly overturn supreme, therefore, when unmanned plane lands, no
Occur carry equipment contact ground and impaired situation, be effectively protected carry equipment.
It should be noted that following examples all so that carry equipment is as camera head are as a example said in the embodiment of the present application
Bright, actually the application is not limited to this.
Suitably referring to figs. 1 to Fig. 5, the lightweight fixed-wing unmanned plane that can protect carry equipment that the embodiment of the present application provides
Including fuselage main body 10 be connected to wing 20 outside fuselage main body 10 both sides, fuselage main body 10 offers fly control storehouse 11,
Umbrella storehouse 12 and equipment compartment 13, wherein, fly the upper surface that control storehouse 11 is opened in fuselage main body 10, are provided with and fly control in winged control storehouse 11
System (not shown), flight control system is made up of master control borad, communication module and some necessary sensor assemblies etc., realizes
Control to unmanned plane during flying and work.Equipment compartment 13 runs through the upper and lower surface of fuselage main body 10, in equipment compartment 13
It is provided with camera head, this camera head is connected with flight control system, take pictures for convenience meanwhile, the photographic head of camera head
Shoot downwards via equipment compartment 13, photographic head stretches out the lower surface of fuselage main body 10.Umbrella storehouse 12 is opened under fuselage main body 10
Surface, arranges parachute, in normal flight operations, the storehouse cover buckle in umbrella storehouse is together in the parachute on umbrella storehouse, in storehouse in umbrella storehouse
It is limited in umbrella storehouse.
Unmanned plane also includes the umbrella control equipment 30 electrically connecting with flight control system, and this umbrella control equipment 30 can be according to flight control system
Control command apply and release the storehouse cover buckle controlling umbrella storehouse 12 together in the active force on umbrella storehouse 12, when umbrella control equipment 30 applies control
The storehouse cover buckle in umbrella storehouse 12 processed keeps buckling state together in the active force on umbrella storehouse 12, Cang Gai, and parachute is in umbrella storehouse；When umbrella control sets
Standby 30 release the storehouse cover buckle controlling umbrella storehouse 12 together in the active force on umbrella storehouse 12, and Cang Gai departs under the action of gravity of counter weight construction
Umbrella storehouse, discharges parachute.
Parachute loses the constraint of Cang Gai, ejects and opens outside storehouse, after parachute is opened, unmanned plane integrally can overturn,
Photographic head under fuselage main body also can accordingly overturn supreme, therefore, when unmanned plane lands, be not in photographic head contact ground
And impaired situation, it is effectively protected photographic head.
Wherein, umbrella control equipment can be to be arranged at the motor switch controlling between umbrella Cang Canggai and umbrella storehouse, by flight control system,
Can also be the mechanical switch including motor and frame for movement, motor is controlled and output campaign by flight control system, and driving mechanical is tied
Structure produces state change and makes Cang Gai be converted into free state by buckling state.
Preferably, the lower surface in fuselage main body 10 is further opened with steering wheel storehouse 14, and umbrella control equipment 30 includes being arranged at steering wheel
Steering wheel 31 in storehouse 14 and the interface arrangment 32 being fixed on umbrella Cang Cang lid inner side, before unmanned plane takes off, parachute are loaded umbrella
In storehouse, flight control system sends the control instruction closing umbrella storehouse, under this control instruction, the horn 33 of steering wheel 31 to steering wheel 31 simultaneously
After turning over certain angle, with interface arrangment 32 clamping, the storehouse cover buckle making umbrella storehouse 12 is together on umbrella storehouse 12；In normal flight operations
In, the horn 33 of steering wheel 31 keeps this angle so that the Cang Gai in umbrella storehouse 12 keeps the state fastening, and parachute is controlled in umbrella storehouse
Within 12；When flight abnormal in fact it could happen that unexpected air crash situation when, flight control system sends the control opening umbrella storehouse to steering wheel 31
Instruction, under this control instruction, after the horn 33 of steering wheel 31 is again rotated through an angle, releases the clamping to interface arrangment 32,
The Cang Gai in umbrella storehouse 12 is made to depart from control under the action of gravity of counter weight construction and depart from umbrella storehouse 12, now parachute is at its own
Leave umbrella storehouse 12 under action of gravity, so that parachute faster and is easier to eject umbrella storehouse, spring structure can be set in the bilge,
Cang Gai keeps the state fastening, and spring is in compressive state, and when Cang Gai departs from umbrella storehouse, spring is changed into free state from compressive state
And eject parachute.
Using the preferred embodiment, control mode is simple, good stability.
It is further preferred that interface arrangment 32 is the tetragonal body with groove 34, the upper surface of tetragonal body is fixed on umbrella storehouse
One end inside the lid of storehouse, groove 34 through two sides of tetragonal body, the side that the opening of groove 34 is located near steering wheel 31,
The opening of groove 34 to side away from steering wheel 31, the horn 33 of steering wheel 31 have the primary importance to groove 34 for the clamping and
Depart from the second position of groove 34, the structure of this interface arrangment 32 is simple, low production cost.
In order to increase the stability that parachute is maintained in umbrella storehouse, it is to avoid parachute mistake ejects, inside umbrella Cang Cang lid
The other end be fixed with two fixed blocks 35, two fixed blocks 35 and the triangle fixing point of tetragonal body, Cang Gai is more stable
Be fixed on buckling state.Fixed block 35 includes being fixed on fixed part 36 and the projection protruding from fixed part 36 that umbrella Cang Cang covers
37, the bulkhead in umbrella storehouse 12 is provided with the groove accommodating raised 37, structure is simple, low production cost.
Preferably, in the upper surface of fuselage main body 10, equipment compartment 13 and winged control storehouse 11 set gradually, from front to back in fuselage
The lower surface of main body 10, equipment compartment 13, steering wheel storehouse 14 and umbrella storehouse 12 set gradually from front to back, fly control storehouse 11 and steering wheel Cang14Chu
In position opposing upper and lower, facilitate the connection line cabling to steering wheel 30 for the flight control system.
Umbrella storehouse 12 is arranged at the first half of fuselage main body 10 so that parachute basic setup is in the centre bit of unmanned plane
Put, stability is more preferable.
Steering wheel storehouse 14 is provided with Cang Gai, and in fuselage main body 10 upper surface side, equipment compartment 13 is also equipped with Cang Gai, on the one hand
Protection is formed to steering wheel and picture pick-up device, on the other hand, makes unmanned plane have the surface of continuous transition, be conducive to reducing flight resistance
Power.
Preferably, fuselage main body 10 and wing 20 all adopt foam making, low cost, light weight, are easy to flight control.Enter
Preferably, unmanned plane is additionally included in the carbon pipe being initially embedded in advance in fuselage main body 10 and wing 20 making unmanned plane to one step, with
Strengthen the intensity of unmanned plane, make fuselage more firm with the connection of wing.
The lightweight fixed-wing unmanned plane that can protect carry equipment being provided from above-mentioned record, this utility model,
With respect to prior art, have the advantages that：When unmanned plane lands, by being arranged at the landing of fuselage main body lower surface
Umbrella is so that whole unmanned plane spins upside down when falling parachute-opening, thus the photographic head of the downward shooting of unmanned plane carry is also turned over
In steering, when unmanned plane contact ground, it is to avoid pick-up lenss contact ground, are effectively protected pick-up lenss.
The sequencing of embodiment of above only for ease of description, does not represent the quality of embodiment.
Finally it should be noted that：Embodiment of above is only in order to illustrating the technical solution of the utility model, rather than it is limited
System；Although being described in detail to this utility model with reference to aforementioned embodiments, those of ordinary skill in the art should
Understand：It still can be modified to the technical scheme described in aforementioned each embodiment, or special to wherein portion of techniques
Levy and carry out equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from each reality of this utility model
Apply the spirit and scope of mode technical scheme.
Claims (10)
1. a kind of lightweight fixed-wing unmanned plane that can protect carry equipment is it is characterised in that include：
Fuselage main body (10), described fuselage main body (10) offers and flies control storehouse (11) and umbrella storehouse (12), and described umbrella storehouse (12) is opened
It is located at the lower surface of described fuselage main body (10)；
Wing (20), is connected to the outside of described fuselage main body (10)；
Flight control system, is arranged in described winged control storehouse (11)；
Carry equipment, on described unmanned plane, wherein, described carry equipment has and extends downwardly from described fuselage main body (10) carry
The ingredient of lower surface；And
Parachute and umbrella control equipment (30), described parachute is arranged in described umbrella storehouse (12), described umbrella control equipment (30) and institute
State flight control system electrical connection, open for controlling described parachute to leave described umbrella storehouse (12).
2. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 1 is it is characterised in that described umbrella
Storehouse (12) is provided with Cang Gai,
The lower surface of described fuselage main body (10) is further opened with steering wheel storehouse (14)；
Described umbrella control equipment (30) includes the steering wheel (31) being arranged in described steering wheel storehouse (14) and is fixed on described umbrella storehouse (12)
Storehouse lid inside interface arrangment (32), described steering wheel (31) electrically connected with described flight control system, the horn of described steering wheel (31)
(33) with the storehouse cover buckle of described umbrella storehouse (12) during described interface arrangment (32) clamping together on described umbrella storehouse (12), described steering wheel
The Cang Gai of horn (33) described umbrella storehouse (12) when separating with described interface arrangment (32) departs from described umbrella storehouse (12).
3. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 2 is it is characterised in that described card
Access node structure (32) is the tetragonal body with groove (34), and the upper surface of described tetragonal body is fixed in the storehouse lid of described umbrella storehouse (12)
One end of side, described groove (34) is through two sides of described tetragonal body, the side at the opening place of described groove (34)
Near described steering wheel (31), the opening of described groove (34) to side away from described steering wheel (31), described steering wheel (31)
Horn (33) has the primary importance to described groove (34) for the clamping and the second position departing from described groove (34).
4. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 3 is it is characterised in that described
The other end inside the storehouse lid in umbrella storehouse (12) is fixed with two fixed blocks (35), described two fixed blocks (35) and described tetragonal body
Triangle fixing point, described fixed block (35) includes being fixed on the fixed part (36) that the storehouse of described umbrella storehouse (12) covers and convex
Projection (37) for described fixed part (36), the bulkhead of described umbrella storehouse (12) is provided with and accommodates the recessed of described projection (37)
Groove.
5. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 4 is it is characterised in that described machine
Equipment compartment (13) is further opened with body main body (10), in the lower surface of described fuselage main body (10), described equipment compartment (13), described
Steering wheel storehouse (14) and described umbrella storehouse (12) set gradually from front to back.
6. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 5 is it is characterised in that described umbrella
The storehouse in storehouse (12) covers and is provided with counter weight construction, and described umbrella storehouse (12) is arranged at the first half of described fuselage main body (10).
7. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 6 is it is characterised in that described rudder
Cabin (14) is provided with Cang Gai, and in described fuselage main body (10) upper surface side, described equipment compartment (13) is provided with Cang Gai.
8. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 1 is it is characterised in that described extension
Load equipment is camera head, and the photographic head of described camera head extend out to described fuselage main body (10) from described equipment compartment (13)
Lower surface is shot.
9. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 1 is it is characterised in that described machine
Body main body (10) is integrally formed by foam with described wing (20).
10. the lightweight fixed-wing unmanned plane that carry equipment can be protected according to claim 9 is it is characterised in that described
It is embedded with carbon pipe in fuselage main body (10) and described wing (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620999760.2U CN205971884U (en) | 2016-08-30 | 2016-08-30 | Can protect light fixed wing uavs of carry equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620999760.2U CN205971884U (en) | 2016-08-30 | 2016-08-30 | Can protect light fixed wing uavs of carry equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205971884U true CN205971884U (en) | 2017-02-22 |
Family
ID=58038549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620999760.2U Expired - Fee Related CN205971884U (en) | 2016-08-30 | 2016-08-30 | Can protect light fixed wing uavs of carry equipment |
Country Status (1)
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| CN (1) | CN205971884U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108778931A (en) * | 2017-10-10 | 2018-11-09 | 深圳市大疆灵眸科技有限公司 | A kind of method for controlling rotation of photographic device, control device and aircraft |
| CN109018425A (en) * | 2018-08-27 | 2018-12-18 | 成都飞机工业（集团）有限责任公司 | A kind of small drone steering engine exchanging structure of low cost |
| CN109250111A (en) * | 2018-09-29 | 2019-01-22 | 长光卫星技术有限公司 | A kind of Modularized unmanned machine parachute cabin system |
| CN113978747A (en) * | 2021-11-05 | 2022-01-28 | 武汉市工程科学技术研究院 | Mechanical measuring device capable of suspending geographic information |
| CN116986036A (en) * | 2023-09-27 | 2023-11-03 | 杭州牧星科技有限公司 | Recovery system of fixed wing unmanned aerial vehicle |
-
2016
- 2016-08-30 CN CN201620999760.2U patent/CN205971884U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108778931A (en) * | 2017-10-10 | 2018-11-09 | 深圳市大疆灵眸科技有限公司 | A kind of method for controlling rotation of photographic device, control device and aircraft |
| WO2019071444A1 (en) * | 2017-10-10 | 2019-04-18 | 深圳市大疆灵眸科技有限公司 | Turning control method for photographic device, control apparatus and aircraft |
| CN108778931B (en) * | 2017-10-10 | 2021-10-29 | 深圳市大疆灵眸科技有限公司 | Rotation control method and control equipment of camera device and aircraft |
| CN109018425A (en) * | 2018-08-27 | 2018-12-18 | 成都飞机工业（集团）有限责任公司 | A kind of small drone steering engine exchanging structure of low cost |
| CN109250111A (en) * | 2018-09-29 | 2019-01-22 | 长光卫星技术有限公司 | A kind of Modularized unmanned machine parachute cabin system |
| CN113978747A (en) * | 2021-11-05 | 2022-01-28 | 武汉市工程科学技术研究院 | Mechanical measuring device capable of suspending geographic information |
| CN116986036A (en) * | 2023-09-27 | 2023-11-03 | 杭州牧星科技有限公司 | Recovery system of fixed wing unmanned aerial vehicle |
| CN116986036B (en) * | 2023-09-27 | 2023-12-22 | 杭州牧星科技有限公司 | Recovery system of fixed wing unmanned aerial vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20200830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |