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. The device includes a propeller hub, the propellers are installed at both ends of the propeller hub through bearings, and an automatic folding device is installed inside the propeller hub; the propeller hub includes A propeller hub structure consisting of an upper propeller hub and a lower propeller hub; the automatic folding device includes an upper mounting disk and a lower mounting disk, the upper mounting disk is fixed below the upper propeller hub, and the lower mounting disk is fixed on the lower propeller hub Above the disk, the center of gravity of the lower mounting disk is fixed, and the upper mounting disk and the lower mounting disk are fixedly connected by fixing; the center of the coil spring is clamped on the fixed column, the rotating disk is clamped on the outside of the coil spring, and the middle of the coil is bound to the rotating disk. , initially in a winding state, with both ends of the coil protruding out and bound to the propeller. The invention changes the folding process of the propeller to automatic folding without additional machinery or manual manipulation, the mechanical structure is relatively simple, and a lot of manpower and material resources are saved.

Description

Limitable automatic folding propeller and its working method

technical field

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

Background technique

In recent years, the development of helicopters and multi-rotors has made great progress. Whether it is a sightseeing autogyro or a multi-rotor focusing on aerial photography, they are very popular recently and are widely loved by children and young men and women. However, due to the structural characteristics of the propeller itself, the portability of small aircraft, the footprint of large aircraft, and the long diameter of the propeller are obstacles. In addition, on some new-configured aircraft that rely on the lift of the rotor at low speed, but do not need the lift of the rotor at high speed, under certain flight conditions, the propeller is not required, and the excessively long extension of the propeller will also become an obstacle. Therefore, folding propellers or folding rotors are more and more used. In recent years, innovations have only focused on the appearance and manual folding of the propeller, that is, when the propeller is stopped, manual operation is required to fold the propeller to reduce the volume.

SUMMARY OF THE INVENTION

In order to solve the problems of the prior art, the present invention provides a limitable automatic folding propeller and a working method thereof, so that the folding process of the propeller is changed to automatic folding without additional mechanical or manual manipulation. Simple, save a lot of manpower and material resources.

The invention provides a limitable automatic folding propeller, which includes a propeller hub, the propellers are installed at both ends of the propeller hub through bearings, and an automatic folding device is installed inside the propeller hub; the propeller hub comprises an upper propeller hub and a A propeller hub structure composed of a lower propeller hub; the automatic folding device includes an upper mounting disk, a lower mounting disk, a fixed column, a coil spring, a rotating disk and a coil, the upper mounting disk is fixed below the upper propeller hub, and the lower mounting disk is installed The disk is fixed above the lower propeller hub, the center of gravity of the lower mounting disk is fixed, and the upper mounting disk and the lower mounting disk are fixedly connected by fixing; The middle part is bound to the rotating disk, which is initially wound, and the two ends of the coil protrude out and are bound to the propeller.

As a further improvement, the center of the propeller hub is provided with a plurality of bolt holes for fixed connection with the aircraft or other devices.

Further improvement, the main section of the propeller is a two-dimensional airfoil.

As a further improvement, the upper mounting plate and the lower mounting plate are respectively installed with limiting pieces.

Further improvement, the propeller includes a propeller main body, a propeller locking ring, a connecting rod, and a restricting piece, 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 both ends of the coil in the movable folding device Tethered to the propeller locking ring.

As a further improvement, the top of the connecting rod is connected with a restricting piece through bolts.

As a further improvement, spacers are installed on the upper and lower sides of the bolt holes at both ends of the propeller hub.

Further improvement, the length of the propeller hub is 20%-40% of the overall structure of the self-folding propeller that can be limited.

The present invention provides a working method of a position-limitable automatic folding propeller, including the following processes:

1) The initial state of the self-folding propeller that can be limited is the folded state;

2) When the power system drives the propeller to rotate, the propeller is subjected to the centrifugal force in the radial direction. With the increase of the rotational speed, the centrifugal force continues to increase. It is stretched and drives the rotation of the rotating disk, and the rotation of the rotating disk makes the coil spring store a certain force and kinetic energy;

3) When the propeller is unfolded to a suitable position, the limiting piece of the propeller head rests on the limiting piece of the automatic folding device, so that the propeller 1 cannot be unfolded more, so as to achieve the normal rotation state of the propeller 1;

4) When the lift or thrust of the propeller is not needed, the engine reduces the speed, and the centrifugal force of the propeller gradually decreases until it cannot be balanced with the elastic force of the coil spring, so that the force and kinetic energy stored by the coil spring in the unfolded state act to make the rotation. The disc rotates in the opposite direction, the rotating disc rotates the condensing coil in the opposite direction, and the coil drives the propeller to return to the folded state.

The beneficial effects of the present invention are:

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

2. Good economy, the structures adopted in the present invention are all common mechanical parts on the market, the procurement is simple, the quality is guaranteed, the cost performance is high, and the invention has good economy.

3. High automation, the present invention breaks through the shackles of the conventional folding propellers, and can make the propellers fold automatically without manual operation, saving a lot of manpower and material resources.

Description of drawings

Fig. 1 is the unfolded view of the folding propeller;

Figure 2 is a folded view of a folding propeller;

Figure 3 is a structural view of a folding propeller;

Figure 4 is a structural view of the automatic folding device of the folding propeller.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

A limitable automatic folding propeller of the present invention, as shown in FIG. 3 , includes a propeller 1 , a propeller hub 2 and an automatic folding device 3 .

The propeller 1 includes: a propeller main body 4 , a propeller locking ring 5 , a connecting rod 6 , and a restricting piece 7 . The propeller main body 4 is a component that provides flight lift, and its section is a two-dimensional airfoil, which can provide lift or thrust through rotation. The propeller locking ring 5 and the propeller main body 4 are formed of an integral material, and are fixedly connected to the propeller main body 4 , and are located outside the propeller rotating shaft. The specific position is determined by the actual size of the propeller 1 and the size of the propeller hub 2 . The connecting rod 6 is at the top of the propeller root and is integrally formed and fixedly connected with the propeller body 4 . The restricting piece 7 is on the top of the connecting rod 6 and is fixedly connected with the connecting rod 6 through bolt connection.

The propeller hub 2 includes: an upper propeller hub 8 , a lower propeller hub 9 , a bearing 10 , and a gasket 11 . There are a plurality of bolt holes 12 in the center position of the disk of the propeller hub 2, which are used for fixed connection with the aircraft or other devices. The bolt holes 13 at both ends of the disk of the propeller hub 2 are used to fix the propeller 1 . Bearings 10 are installed in the bolt holes 13 at both ends to support the rotational folding of the propeller 1 . The gaskets 11 are installed on the upper and lower sides of the bolt holes of the propeller 1 respectively during installation, and are used as sealing and friction-increasing components when the propeller 1 and the propeller hub 2 are connected to each other.

As shown in FIG. 4 , the automatic folding device 3 includes: an upper mounting plate 14 , a lower mounting plate 15 , a fixing column 16 , a coil spring 17 , a rotating plate 18 , a limiting piece 19 , and a coil 20 . The upper mounting plate 15 is fixed below the upper propeller hub 8 with bolts, and the lower mounting plate 15 is fixed above the lower propeller hub 9 . The fixing column 16 is fixed at the center of gravity of the lower mounting plate 15, and there is a bolt hole 21 at the top. The coil spring 17 is centrally clamped on the fixing post 16 . The rotating disk 18 is clamped on the outside of the coil spring 17, and is not otherwise fixed, and can be rotated by force. The middle of the coil 20 is bound to the rotating disk 18 and is initially wound, and both ends of the coil 20 protrude out and are bound to the propeller locking ring 5 . The limiting piece 19 is fixedly connected with the upper and lower mounting plates 14 and 15 . The upper mounting plate 14 and the lower mounting plate 15 are bolted and connected to the fixing posts 16 of the lower mounting plate 15 through the bolt holes 22 of the upper mounting plate 14 .

The present invention is a position-limiting automatic folding propeller, and the initial state is a folded state, as shown in Figure 2.

When the power system drives the propeller 1 to rotate, the propeller 1 is subjected to the centrifugal force in the radial direction. With the increase of the rotational speed, the centrifugal force increases continuously. The increasing centrifugal force balances the elastic force of the coil spring 17 and makes the propeller 1 automatically unfold. , the coil 20 will be stretched, and drive the rotation of the rotary disk 15, and the rotation of the rotary disk 18 makes the coil spring 17 store a certain force and kinetic energy. When the propeller 1 is unfolded to an appropriate position, the limiting piece 7 of the propeller head of the propeller 1 will be placed on the limiting piece 19 of the automatic folding device, so that the propeller 1 cannot be unfolded more, so as to achieve the normal rotation state of the propeller 1, as shown in the figure 1 shown.

When the lift or thrust of the propeller 1 is not required, the engine will reduce the rotational speed, and the centrifugal force of the propeller 1 will gradually decrease until it cannot be balanced with the elastic force of the coil spring 17, so that the coil spring 17 stores the force and kinetic energy in the unfolded state It will act to make the rotating disk 18 rotate in the reverse direction, and the rotating disk 18 will rotate in the reverse direction to converge the coil 20, and the coil 20 will drive the propeller 1 to return to the folded state.

There are many specific application ways of the present invention, and the above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements can be made. These Improvements should also be considered as the protection scope of the present 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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