CN112061388A - Automatic folding propeller capable of limiting and working method thereof - Google Patents

Abstract

The invention provides a limitable automatic folding propeller and a working method thereof, wherein the device comprises a propeller hub, wherein propellers are arranged at two ends of the propeller hub through bearings, and an automatic folding device is arranged in the propeller hub; the hub comprises a hub disc structure consisting of an upper hub disc and a lower hub disc; the automatic folding device comprises an upper mounting disc and a lower mounting disc, wherein the upper mounting disc is fixed below an upper propeller hub disc, the lower mounting disc is fixed above a lower propeller hub disc, the gravity center position of the lower mounting disc is fixedly arranged, and the upper mounting disc and the lower mounting disc are fixedly connected through fixation; the center of the coil spring is clamped on the fixing column, the rotating disk is clamped on the outer side of the coil spring, the middle of the coil is bound to the rotating disk and is in a winding state initially, and the two ends of the coil extend outwards and are bound to the propeller. The invention changes the folding process of the propeller into automatic folding without additional machinery or manual operation, has simpler mechanical structure and saves a large amount of manpower and material resources.

Description

Automatic folding propeller capable of limiting and working method thereof

Technical Field

The invention relates to the technical field of aviation equipment, in particular to a limitable automatic folding propeller and a working method thereof.

Background

The development of helicopters and multi-rotors has advanced in the last few years, and both sightseeing autorotation rotorcraft and multi-rotors focused on aerial photography are very popular recently and are widely popular among children and young men and women. However, due to the structural characteristics of the propeller, the size of the large aircraft is too large to be portable, which is an obstacle to the large aircraft. In addition, in some new configuration aircraft that rely on rotor lift at low speeds and do not require rotor lift at high speeds, propellers are not needed under certain flight conditions, and the extended length of the propellers that is too long can also be an obstacle. Folded propellers or folded rotors are increasingly being used. And the innovation of recent years only focuses on appearance and manual folding of the propeller, namely, after the propeller stops rotating, manual operation is needed, and the propeller can be folded to achieve the effect of reducing the volume.

Disclosure of Invention

The invention provides a limitable automatic folding propeller and a working method thereof in order to solve the problems of the prior art, so that the folding process of the propeller is changed into automatic folding without additional machinery or manual operation, the mechanical structure is simpler, and a large amount of manpower and material resources are saved.

The invention provides a limitable automatic folding propeller which comprises a propeller hub, wherein propellers are arranged at two ends of the propeller hub through bearings, and an automatic folding device is arranged in the propeller hub; the hub comprises a hub disc structure consisting of an upper hub disc and a lower hub disc; the automatic folding device comprises an upper mounting disc, a lower mounting disc, a fixed column, a coil spring, a rotating disc and a coil, wherein the upper mounting disc is fixed below an upper propeller hub disc, the lower mounting disc is fixed above a lower propeller hub disc, the gravity center position of the lower mounting disc is fixed, and the upper mounting disc and the lower mounting disc are fixedly connected through the fixing disc; the center of the coil spring is clamped on the fixing column, the rotating disk is clamped on the outer side of the coil spring, the middle of the coil is bound to the rotating disk and is in a winding state initially, and the two ends of the coil extend outwards and are bound to the propeller.

In a further improvement, the central position of the hub disk is provided with a plurality of bolt holes for fixedly connecting with an aircraft or other devices.

In further improvement, the section of the propeller main body is a two-dimensional airfoil.

Further improve, last mounting disc and lower mounting disc install spacing piece respectively.

The propeller comprises a propeller main body, a propeller locking ring, a connecting rod and a limiting sheet, wherein the propeller locking ring and the propeller main body are integrally formed, the propeller locking ring is fixedly connected with the propeller main body, and two ends of a coil in the movable folding device are bound on the propeller locking ring.

In a further improvement, the top of the connecting rod is connected with a limiting sheet through a bolt.

In a further improvement, gaskets are arranged on the upper side and the lower side of the bolt holes at the two ends of the propeller hub.

Further improved, the length of the propeller hub is 20% -40% of the whole structure of the automatic folding propeller capable of limiting.

The invention provides a working method of a limitable automatic folding propeller, which comprises the following processes:

1) the automatic folding propeller capable of limiting is in a folding state in an initial state;

2) when the power system drives the propeller to rotate, the propeller is acted by centrifugal force in a radial direction, the centrifugal force is continuously increased along with the increase of the rotating speed, the continuously increased centrifugal force balances the elastic force of the coil spring and enables the propeller to automatically unfold, the coil is stretched and drives the rotating disc to rotate, and the rotating disc enables the coil spring to store certain force and kinetic energy;

3) when the propeller is unfolded to a proper position, the limited sheet of the propeller head of the propeller is pressed against the limited sheet of the automatic folding device, so that the propeller 1 cannot be unfolded more, and the normal rotating state of the propeller 1 is achieved;

4) when the lifting force or the thrust of the propeller is not needed, the engine reduces the rotating speed, the centrifugal force of the propeller is gradually reduced until the centrifugal force cannot be balanced with the elastic force of the coil spring, so that the force stored by the coil spring in the unfolding state acts on the kinetic energy, the rotating disc rotates in the reverse direction to wind the coil, and the coil drives the propeller to return to the folding state.

The invention has the beneficial effects that:

1. the mechanical structure is simple, the coil spring is used for stroke recovery, and the mechanical structure is simple.

2. The structure adopted by the invention is common mechanical parts on the market, the purchase is simple, the quality is ensured, the cost performance is high, and the economy is good.

3. The automatic folding device has high automation, and the invention breaks through the limitation of the prior common folding propeller, can ensure that the propeller can be automatically folded without manual operation, and saves a large amount of manpower and material resources.

Drawings

FIG. 1 is an expanded view of a folding propeller;

FIG. 2 is a folded view of the folding propeller;

FIG. 3 is a structural view of a folding propeller;

fig. 4 is a structural view of an automatic folding device for folding a propeller.

Detailed Description

The invention will be further explained with reference to the drawings.

The invention discloses an automatic folding propeller capable of limiting, which is shown in figure 3 and comprises: propeller 1, propeller hub 2 and automatic folding device 3.

The propeller 1 includes: the propeller locking ring comprises a propeller body 4, a propeller locking ring 5, a connecting rod 6 and a limiting sheet 7. The propeller body 4 is a member for providing flight lift, and has a two-dimensional wing section, and can provide lift or thrust by rotation. The propeller locking ring 5 and the propeller main body 4 are formed by an integrated material and are fixedly connected to the propeller main body 4, the position of the propeller locking ring is arranged outside the propeller rotating shaft, and the specific position of the propeller locking ring is determined by the actual size of the propeller 1 and the size of the propeller hub 2. The connecting rod 6 is arranged at the top of the propeller root and fixedly connected with the propeller body 4 in an integrated forming mode. The restricted piece 7 is fixedly connected with the connecting rod 6 through bolt connection at the top of the connecting rod 6.

The hub 2 comprises: upper hub 8, lower hub 9, bearing 10, spacer 11. A plurality of bolt holes 12 are centrally located in the hub 2 for securing to an aircraft or other device. Bolt holes 13 at both ends of the disk of the propeller hub 2 are used for fixing the propeller 1. Bearings 10 are mounted in the bolt holes 13 at both ends for supporting the rotation folding of the propeller 1. The gaskets 11 are respectively arranged at the upper side and the lower side of the bolt hole of the propeller 1 during installation and are used as sealing and friction force increasing components when the propeller 1 is connected with the hub 2.

As shown in fig. 4, the automatic folding apparatus 3 includes: an upper mounting plate 14, a lower mounting plate 15, a fixing post 16, a coil spring 17, a rotating plate 18, a limiting piece 19, and a coil 20. The upper mounting plate 15 is bolted to the underside of the upper rotor hub 8 and the lower mounting plate 15 is bolted to the underside of the lower rotor hub 9. The fixing post 16 is fixed at the center of gravity of the lower mounting plate 15, and a bolt hole 21 is formed at the top. The coil spring 17 is centrally caught on the fixing post 16. The rotary disk 18 is clamped outside the coil spring 17, is not fixed, and can rotate under stress. The coil 20 is constrained to the rotary disc 18 in the middle, initially wound, and the coil 20 is extended out at both ends and constrained to the propeller locking ring 5. The limiting sheet 19 is fixedly connected with the upper and lower mounting discs 14 and 15. The upper mounting plate 14 and the lower mounting plate 15 are fixedly connected with the fixing column 16 of the lower mounting plate 15 through the bolt hole 22 of the upper mounting plate 14.

The invention relates to an automatic folding propeller capable of limiting, wherein the initial state is a folding state, as shown in figure 2.

When the power system drives the propeller 1 to rotate, the propeller 1 is acted by centrifugal force in a radial direction, the centrifugal force is continuously increased along with the increase of the rotating speed, the continuously increased centrifugal force balances the elastic force of the coil spring 17 and enables the propeller 1 to automatically unfold, the coil 20 is stretched and drives the rotating disc 15 to rotate, and the rotating disc 18 rotates to enable the coil spring 17 to store certain force and kinetic energy. When the propeller 1 is unfolded to a proper position, the limiting sheet 7 of the head of the propeller 1 is pressed against the limiting sheet 19 of the automatic folding device, so that the propeller 1 cannot be unfolded any more, and the normal rotating state of the propeller 1 is achieved, as shown in fig. 1.

When the lifting force or the thrust of the propeller 1 is not needed, the engine will reduce the rotating speed, the centrifugal force of the propeller 1 will gradually decrease until the centrifugal force cannot be balanced with the elastic force of the coil spring 17, so that the force and the kinetic energy stored by the coil spring 17 in the unfolding state will act to enable the rotating disc 18 to rotate in the reverse direction, the rotating disc 18 rotates in the reverse direction to wind the coil 20, and the coil 20 drives the propeller 1 to return to the folding state.

While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (9)

1. The utility model provides a can spacing automatic folding screw, includes the propeller hub, the propeller hub both ends are installed the screw through the bearing, its characterized in that: an automatic folding device is arranged in the propeller hub; the hub comprises a hub disc structure consisting of an upper hub disc and a lower hub disc; the automatic folding device comprises an upper mounting disc, a lower mounting disc, a fixed column, a coil spring, a rotating disc and a coil, wherein the upper mounting disc is fixed below an upper propeller hub disc, the lower mounting disc is fixed above a lower propeller hub disc, the gravity center position of the lower mounting disc is fixed, and the upper mounting disc and the lower mounting disc are fixedly connected through the fixing disc; the center of the coil spring is clamped on the fixing column, the rotating disk is clamped on the outer side of the coil spring, the middle of the coil is bound to the rotating disk and is in a winding state initially, and the two ends of the coil extend outwards and are bound to the propeller.

2. The automatically collapsible propeller of claim 1, wherein: and a plurality of bolt holes for fixedly connecting with an aircraft or other devices are formed in the center of the hub disk.

3. The automatically collapsible propeller of claim 1, wherein: the section of the propeller main body is a two-dimensional wing type.

4. The automatically collapsible propeller of claim 1, wherein: the upper mounting disc and the lower mounting disc are respectively provided with a limiting piece.

5. The automatically collapsible propeller of claim 1, wherein: the propeller comprises a propeller body, a propeller locking ring, a connecting rod and a limiting sheet, wherein the propeller locking ring and the propeller body are integrally formed, the propeller locking ring is fixedly connected with the propeller body, and two ends of a coil in the movable folding device are bound on the propeller locking ring.

6. The automatically collapsible propeller of claim 5, wherein: the top of the connecting rod is connected with a limiting sheet through a bolt.

7. The automatically collapsible propeller of claim 1, wherein: gaskets are arranged on the upper side and the lower side of the bolt holes at the two ends of the propeller hub.

8. The automatically collapsible propeller of claim 1, wherein: the length of the propeller hub is 20% -40% of the whole structure of the automatic folding propeller capable of limiting.

9. A working method of a limitable automatic folding propeller is characterized by comprising the following processes:

1) the automatic folding propeller capable of limiting is in a folding state in an initial state;

2) when the power system drives the propeller to rotate, the propeller is acted by centrifugal force in a radial direction, the centrifugal force is continuously increased along with the increase of the rotating speed, the continuously increased centrifugal force balances the elastic force of the coil spring and enables the propeller to automatically unfold, the coil is stretched and drives the rotating disc to rotate, and the rotating disc enables the coil spring to store certain force and kinetic energy;

3) when the propeller is unfolded to a proper position, the limited sheet of the propeller head of the propeller is pressed against the limited sheet of the automatic folding device, so that the propeller cannot be unfolded more, and the normal rotation state of the propeller is achieved;

4) when the lifting force or the thrust of the propeller is not needed, the engine reduces the rotating speed, the centrifugal force of the propeller is gradually reduced until the centrifugal force cannot be balanced with the elastic force of the coil spring, so that the force stored by the coil spring in the unfolding state acts on the kinetic energy, the rotating disc rotates in the reverse direction to wind the coil, and the coil drives the propeller to return to the folding state.

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