KR101698976B1 - Turn-over apparatus for propeller - Google Patents

Abstract

The propeller is turned over from a horizontal posture to a vertical posture in order to install a large-scale propeller for ship propulsion on a hull, and a large propeller is stably mounted on the apparatus in a horizontal posture and fixed. To a large propeller turnover device in which a large propeller can be stably turned over from a horizontal posture to a vertical posture in accordance with the rotation of the bed for turningover by the propeller.

Description

[0002] Large propeller turnover device {TURN-OVER APPARATUS FOR PROPELLER}

The present invention relates to a large propeller turnover device required to turn over a large propeller for ship propulsion.

Generally, the large propeller for ship propulsion is manufactured by machining after casting (cutting off the pressure, eye bolt hole operation for propeller lifting, boss lowering process, boss upper surface machining, inner diameter boring) It should be inverted about 6 to 8 times in order to do boring, forward face milling, backward face wing milling, forward face grinding, reverse face grinding, inspection, etc.).

In addition, the large-scale propeller for machining completed with such machining should be moved to a horizontal posture and then to a vertical posture to be installed on the hull.

Conventionally, a method for changing the posture of a large propeller for ship propulsion was to use an overhead crane and a wire rope.

On the other hand, as a conventional technology for turning over a propeller for processing a propeller, Korean Patent No. 10-0478248 entitled " Large Propeller Turnover Device "(Registered on Nov. 3, 2005), Korea Patent No. 10-1250231 Propeller turnover device using a frame equipped with a swing arm and a conveying roller "(registered in 2013. 3.28) have been proposed, but the installation work of the propeller is still carried out using a crane and a wire rope.

Korean Patent No. 10-0478248 "Large propeller turnover device" (registered on March 31, 2005) Korean Patent No. 10-1250231 entitled " Propeller Turnover Device Using Frames with Swing Arm and Feed Roller "

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a large-scale propeller turnover device capable of turning over a propeller from a horizontal posture to a vertical posture in order to install a large- ≪ / RTI >

According to an aspect of the present invention, there is provided an airbag module comprising: a base frame horizontally disposed; a pair of body frames disposed on the upper portion of the base frame, the pair of body frames facing each other; And a turn-over hydraulic cylinder provided between the base frame and the turn-over bed for rotating the turn-over bed, wherein the turn- A propeller fixing means provided on the bed for fixing the hub portion of the propeller; The propeller fixing means includes a hydraulic cylinder for a holder provided on the turnover bed, a truncated pyramid member mounted on a rod of the hydraulic cylinder for the holder and moving up and down, and a pyramid member mounted on each side of the truncated pyramid member, And a holder piece which moves in a radial direction in accordance with the upward / downward movement and can be tightly fixed to the inner circumferential surface of the propeller hub portion; Wherein the hydraulic cylinder for the holder is a hollow hydraulic cylinder, a hydraulic cylinder for a stopper is further provided below the hydraulic cylinder for the holder, and a rod of the hydraulic cylinder for the stopper is disposed along the inside of the hydraulic cylinder for the holder and the truncated pyramid Wherein a stopper plate is provided on an upper portion of the pyramidal member through a spring, and a plurality of stoppers are rotatably provided on the stopper mounting plate, The stopper is changed to a horizontal posture or a vertical posture by being separated from the pressure plate by the pressure plate; .
According to another aspect of the present invention, there is provided an air conditioner comprising: a base frame provided horizontally; a pair of body frames disposed on the upper portion of the base frame, the pair of body frames facing each other; A turn-over bed rotatably supported on an upper portion of the body frame, a turn-over hydraulic cylinder provided between the base frame and the turn-over bed for rotating the turn-over bed, A propeller fixing means for fixing the hub portion of the propeller; The propeller fixing means includes a hydraulic cylinder for a holder provided on the turnover bed, a truncated pyramid member mounted on a rod of the hydraulic cylinder for the holder and moving up and down, and a pyramid member mounted on each side of the truncated pyramid member, And a holder piece which moves in a radial direction in accordance with the upward / downward movement and can be tightly fixed to the inner circumferential surface of the propeller hub portion; Wherein the hydraulic cylinder for the holder is a hollow hydraulic cylinder, a hydraulic cylinder for a stopper is further provided below the hydraulic cylinder for the holder, and a rod of the hydraulic cylinder for the stopper is disposed along the inside of the hydraulic cylinder for the holder and the truncated pyramid Wherein a pressure plate is provided at an upper end of a rod of the hydraulic cylinder for the stopper and is mounted on a rod of the hydraulic cylinder for the stopper and an inverted truncated pyramid member is provided below the pressure plate, An auxiliary stopper mounted to be slidable along each side is provided and an auxiliary spring for elastically supporting the auxiliary stopper is provided on an upper portion of the truncated pyramid member; .

In this case, a bed rotation shaft is provided on both sides of the turnover bed so that the turnover bed is rotatable with respect to the body frame, and the turnover bed includes a front bed extending forward with respect to the bed rotation axis, And an extension of a shaft center of the hub portion of the propeller is disposed so as to pass through a rear bed portion of the turnover bed, and the rear bed portion is extended longer than an extension length of the front bed portion, And the hydraulic cylinder for turning-over is connected to the rear edge of the rear bed portion of the turn-over bed.

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In the above, it is preferable that a video camera is provided on the upper portion of the pressure plate, the hydraulic cylinder for the stopper is a hollow hydraulic cylinder, and the video camera passes through the inside of the stopper hydraulic cylinder, And is connected to an external video receiver through a connection line.

As described above, the present invention provides a large-scale propeller turnover device of a new structure capable of turning over a propeller from a horizontal posture to a vertical posture in order to install a large propeller for ship propulsion on a hull.

In particular, according to the present invention, a large propeller is stably mounted and fixed in a horizontal posture on the apparatus, and a large propeller can be stably turned over from a horizontal posture to a vertical posture in accordance with rotation of a turn- Will provide a large propeller turnover device.

1 is a perspective view of a large propeller turnover device according to a first embodiment of the present invention,
Figure 2 is a conceptual side view of Figure 1,
FIG. 3 is a perspective view showing the inside of the body frame of FIG. 1,
FIG. 4 is a perspective view showing a main part of the propeller fixing means in FIG. 1,
FIG. 5 is an exploded perspective view of the truncated pyramid member and the holder member of FIG. 4,
Figure 6 is a conceptual cross-sectional view of Figure 4,
Fig. 7 is a perspective view showing a state where Fig. 4 is changed to fix the propeller,
Figure 8 is a conceptual cross-sectional view of Figure 7,
Figs. 9 to 13 sequentially show states using the embodiment of Fig. 1. Fig.
FIG. 14 is a conceptual sectional view showing a main part of a propeller fixing means according to a second embodiment of the present invention, FIG.
Fig. 15 is an exploded perspective view of the inverted truncated pyramid member and the auxiliary stopper in Fig. 14,
Figure 16 is a view corresponding to Figure 9 of a second embodiment of the present invention,
Figure 17 corresponds to Figure 12 of the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a first embodiment of the present invention will be described.

FIG. 1 is a perspective view of a large propeller turnover device according to a first embodiment of the present invention, FIG. 2 is a conceptual side view of FIG. 1, FIG. 3 is a perspective view showing the inside of the body frame of FIG. 1, FIG. 5 is a perspective view showing the main part of the propeller fixing means in FIG. 1, FIG. 5 is a perspective view showing the truncated pyramid member and the holder piece in FIG. 4, FIG. 6 is a conceptual sectional view of FIG. FIG. 8 is a conceptual cross-sectional view of FIG. 7, and FIGS. 9 to 13 are views sequentially showing states using the embodiment of FIG.

The large propeller turnover device of the present embodiment mainly includes a base frame 110, a body frame 120, a turnover bed 130, a hydraulic cylinder 140 for turnover, a propeller provided in the turnover bed 130, Fixing means and the like.

A large propeller (10, hereinafter referred to as "propeller") for ship propulsion is a very heavy weight weighing approximately 75 to 150 tons.

The large propeller turnover device is for converting the propeller 10 into a vertical posture in a state where the propeller 10 is placed in a horizontal posture on the turnover bed 130 and then fixed.

The base frame 110 is provided horizontally. The base frame 110 serves as a base for mounting the body frame 120 to be described later.

A pair of body frames 120 are formed on the upper portion of the base frame 110. The pair of body frames 120 are disposed facing each other and facing each other.

A rib frame 121 for supporting the body frame 120 is provided on the outer side of each body frame 120.

A horizontal stopper 122 and a vertical stopper 123 are provided on the inner side of each body frame 120 for restricting the turning angle of the turn-over bed 130 (see FIG. 3).

The horizontal stopper 122 is provided to maintain the horizontal posture of the turnover bed 130 and the vertical stopper 123 is provided to maintain the vertical posture of the turnover bed 130.

Between the pair of body frames 120, a bed 130 for turning over is provided.

The turntable bed 130 is provided for rotating the propeller 10 and is provided with bed rotating shafts 131 on both sides of the turn turning bed 130 to rotate the bed rotating shaft 131 Is rotatably supported on a shaft support 124 provided on the upper portion of the body frame 120. [

 Therefore, the turn-over bed 130 can be rotated around the bed rotating shaft 131. A shaft support 124 for supporting the bed rotating shaft 131 of the turnover bed 130 is provided on the upper portion of the body frame 120. This is to prevent the turntable bed 130 and the propeller 10 from being distanced from the base frame 110 even when the turn-over bed 130 is converted into a vertical posture.

A turn-over hydraulic cylinder 140 is provided to rotate the turn-over bed 130. The turn-over hydraulic cylinder 140 is connected to the upper edge of the base frame 110 and the edge of the turn-over bed 130, and has a tilted posture.

In this embodiment, two turn-over hydraulic cylinders 140 are provided, and a cover plate 125 is provided on the upper portion of the turn-over hydraulic cylinder 140 so that both sides are connected to the body frame 120.

The turnover bed 130 is divided into a front bed portion 130a extending forward and a rear bed portion 130b extending rearward with respect to the bed rotating shaft 131. The rear bed portion 130b is divided into a front And the hydraulic cylinder 140 for turning over is connected to the rear edge of the rear bed part 130b of the turn-over bed 130. The turn-

An extension of the axial center of the hub portion 11 of the propeller 10 is disposed so as to pass through the rear bed portion 130b.

That is, in the posture of the turnover bed 130 shown in FIG. 2, the extension line of the axial center of the hub portion 11 of the propeller 10 is positioned between the backward edge of the bed rotating shaft 131 and the rear bed portion 130b do.

This arrangement prevents sudden rotation of the turn-over bed 130 due to the weight of the propeller 10 when the propeller 10 is rotated, that is, when the turn-over bed 130 is rotated And the turn-of-use hydraulic cylinder 140 exert a maximum moment on the turn-over bed 130 by the same force.

Propeller fixing means for fixing the hub portion 11 of the propeller 10 to the bed 130 for turning-over is provided.

A holder hydraulic cylinder 210 is provided on the turnover bed 130 and a rod 211 of the holder hydraulic cylinder 210 protrudes above the turnover bed 130.

A truncated pyramid member 220 is fixed to an upper end of a rod 211 of a hydraulic cylinder 210 for a holder and the truncated pyramid member 220 moves vertically as the rod 211 moves up and down.

A first holder piece guide groove 222 is formed on each side surface 221 of the truncated cone member 220.

The holder piece 230 is mounted on each side surface 221 of the truncated pyramid member 220.

In this embodiment, the truncated pyramid member 220 is in the form of a quadrangular pyramid, so that the truncated pyramid member 220 has four side surfaces 221, and the truncated pyramid member 220 is equipped with four holder pieces 230, The shape of the truncated cone member 220 can be variously changed.

A first guide protrusion (not shown) for guiding the movement along the side surface 221 of the truncated pyramid member 220 is inserted into the first holder piece guiding groove 222 of the truncated pyramid member 220 inside each of the holder pieces 230 231 are formed. That is, each holder piece 230 can be moved along the side surface 221 of the truncated pyramid member 220.

On the other hand, a holder piece guide plate 240 is provided on the upper surface of the turn-over bed 130.

The holder piece guide plate 240 is provided to guide the movement of the holder piece 230 in the radial direction. The holder piece guide plate 240 has a second holder piece guide groove 241 formed therein.

A second guide protrusion 232 is formed in the lower portion of the holder piece 230 so as to be inserted into the second holder piece guide groove 241 of the holder piece guide plate 240 to guide the movement in the radial direction. I.e., in the radial direction along the holder piece guide plates 240 of the respective holder pieces 230.

As a result, the upward and downward movement of the truncated pyramid member 220 is converted to the radial movement of the holder piece 230 due to the shape of the truncated pyramid member 220 formed at an angle.

When the upper portion of the truncated pyramid member 220 is further moved, the holder piece 230 moves radially outward and can be closely fixed to the inner circumferential surface of the propeller hub portion 11.

A bronze coating is applied to the outer surface of the holder piece 230 (that is, the surface contacting the propeller hub portion 11) in order to prevent damage to the hub portion 11 in consideration of the function of the holder piece 230. [ Or rubber-coated.

In the present embodiment, the hydraulic cylinder 210 for a holder is a hollow hydraulic cylinder, and the rod 211 of the hydraulic cylinder 210 for a holder is also hollow, and a hollow 223 is formed also at the center of the truncated cone member 220 .

A hydraulic cylinder 250 for a stopper is provided below the hydraulic cylinder 210 for a holder.

The rod 251 of the hydraulic cylinder 250 for the stopper is disposed inside the hydraulic cylinder 210 for the holder, inside the rod 211 of the hydraulic cylinder 210 for the holder, along the hollow 223 of the truncated cone member 220 As shown in FIG.

A disk-shaped pressure plate 260 is provided at the upper end of the rod 251 of the stopper hydraulic cylinder 250.

Therefore, the pressure plate 260 can be moved up and down by driving the hydraulic cylinder 250 for the stopper.

The diameter of the pressure plate 260 should be smaller than the inner diameter of the hub portion 11 of the propeller 10 so that the pressure plate 260 can be inserted into the hub portion 11 of the propeller 10.

On the other hand, a stopper mounting plate 280 is provided on the upper part of the truncated pyramid member 220 through a spring 270.

A plurality of stoppers 281 are rotatably provided on the stopper mounting plate 280.

When there is no external force, the stopper 281 is converted into a downwardly suspended state, that is, a vertical posture. Such an attitude allows the stopper mounting plate 280 provided with the stopper 281 to be inserted into the hub portion 11 of the propeller 10.

Further, the stopper 281 is pressed by the pressure plate 260 and converted into a horizontal posture.

A first spring guide pipe 224 is provided on the upper part of the truncated pyramid member 220 and a second spring guide pipe 283 is provided on the lower part of the stopper mounting plate 280 to guide compression and relaxation of the springs 270. [ ).

On the other hand, a video camera 290 is provided on the top of the pressure plate 260.

The video camera 290 is connected to an external video receiver 292 through a connection line 291 (communication line or power line).

At this time, the connection line 291 is disposed inside the hydraulic cylinder 250 for the stopper and inside the rod 251 of the hydraulic cylinder 250 for the stopper.

Due to such a structure, the arrangement structure of the connection line 291 becomes very simple.

The operation state of the above-described embodiment will be described.

First, the propeller 10 is placed on the apparatus as shown in FIG.

The propeller 10 descends in a horizontal posture by a crane or the like and is placed on the upper portion of the holder piece guide plate 240.

The video camera 290 photographing the upper part while the propeller 10 descends can check in real time whether the propeller 10 descends to the correct position in the image receiver 292 or the notebook computer etc. and confirms the position of the propeller 10 Can be adjusted.

Particularly, when the video camera 290 shoots the straight portion and the video camera 290 shoots the hub portion 11 of the propeller 10, the propeller 10 can be positioned at the correct position.

The stopper 281 provided on the stopper mounting plate 280 does not interfere with the propeller 10 because it takes a vertical posture while the propeller 10 descends.

On the other hand, the horizontal stopper 122 fixes the turn-over bed 130 in a fixed position, so that the load is not applied to the turn-over hydraulic cylinder 140, despite the presence of the heavy propeller 10.

10, the inner circumferential surface of the hub portion 11 of the propeller 10 is crimped and fixed by the holder piece 230. As shown in FIG.

That is, the truncated pyramid member 220 is moved upward by the hydraulic cylinder 210 for the holder, whereby the holder piece 230 moves in the radially outward direction and is brought into close contact with the inner circumferential surface of the propeller hub portion 11. Whereby the propeller 10 is fixed primarily to the apparatus.

11, the pressure plate 260 is moved downward by the stopper hydraulic cylinder 250 to convert the stopper 281 of the stopper mounting plate 280 into a horizontal posture.

12, the pressure plate 260 further moves downward by the stopper hydraulic cylinder 250 so that the stopper 281 of the stopper mounting plate 280 is moved to the upper end of the hub portion 11 of the propeller 10 . Whereby the propeller 10 is firmly fixed to the apparatus.

10 to 12, the inner circumferential surface of the hub portion 11 of the propeller 10 is fixed by the holder piece 230 while the upper end of the hub portion 11 of the propeller 10 is fixed to the stopper 281).

Then, as shown in FIG. 13, the turn-over hydraulic cylinder 140 is driven to rotate the turn-over bed 130 in a counterclockwise direction, and the propeller 10 is converted into a vertical posture do.

At this time, the turn-over bed 130 rotates until it contacts the vertical stopper 123.

Hereinafter, a second embodiment of the present invention will be described.

FIG. 14 is a conceptual sectional view showing a main part of a propeller fixing means according to a second embodiment of the present invention, FIG. 15 is an exploded perspective view of an inverted truncated pyramid member and an auxiliary stopper of FIG. 14, FIG. 17 is a view corresponding to FIG. 12 of the second embodiment of the present invention.

The present embodiment differs from the first embodiment in constituent elements for fixing the upper end of the hub portion 11 of the propeller 10, and the rest are the same. Only different elements are described below.

A disk-shaped pressure plate 260 is provided at the upper end of the rod 251 of the hydraulic cylinder 250 for the stopper as in the first embodiment.

An inverted truncated pyramid member 320 and a support plate 340 are provided under the pressure plate 260.

The inverted truncated pyramid member 320 and the support plate 340 are provided on the rod 251 of the hydraulic cylinder 250 for the stopper.

The inverted truncated pyramid member 320 is positioned below the pressure plate 260.

The inverted truncated pyramid member 320 has a truncated pyramid shape whose sectional area decreases while facing downward.

The auxiliary stopper guide groove 321a is formed on each side surface 321 of the inverted truncated pyramid member 320 and the auxiliary stopper 330 is mounted on each side surface 321 of the inverted truncated pyramid member 320.

In this embodiment, the inverted truncated pyramid member 320 is in the form of an inverted quadrangular pyramid, so that the inverted truncated pyramid member 320 has four sides 321, The shape of the inverted truncated pyramid member 320 may be variously changed.

A guide protrusion 331 inserted into the auxiliary stopper guide groove 321a of the inverted truncated pyramid member 320 and guided along the side surface 321 of the inverted truncated pyramid member 320 is provided inside each auxiliary stopper 330, Respectively. Each auxiliary stopper 330 can be moved obliquely along the side surface 321 of the inverted truncated pyramid member 320.

The support plate 340 is fixed to the rod 251 of the hydraulic cylinder 250 for the stopper to fix the inverted truncated pyramid member 320 at the lower portion and to restrict the movement range of the auxiliary stopper 330.

On the other hand, an auxiliary spring 350 is provided on the upper part of the truncated pyramid member 220.

An auxiliary support pipe 360 is provided on the upper surface of the truncated cone member 220 and the lower end of the auxiliary spring 350 is supported by the auxiliary support pipe 360.

The auxiliary spring 350 is provided to elastically support the auxiliary stopper 330.

The operation of the second embodiment will be described.

After the propeller 10 is placed as shown in Fig. 16, the hub portion 11 of the propeller 10 is fixed as shown in Fig.

17, the truncated pyramid member 220 is moved upward by the hydraulic cylinder 210 for the holder, whereby the holder piece 230 is radially outwardly moved and brought into close contact with the inner peripheral surface of the propeller hub portion 11. Whereby the propeller 10 is fixed primarily to the apparatus.

Further, the auxiliary spring 350 is moved upward by the hydraulic cylinder 210 for the holder, and the auxiliary stopper 330 is moved upward while the auxiliary stopper 330 is moved to the upper side in the radial direction.

The pressure plate 260 is moved downward by the stopper hydraulic cylinder 250 so that the auxiliary stopper 330 is brought into close contact with the upper end of the hub portion 11 of the propeller 10. Whereby the propeller 10 is firmly fixed to the apparatus.

The process of turning the propeller 10 after the propeller 10 is fixed is the same as that of the first embodiment.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: Propeller
110: base frame
120: body frame 121: rib frame
122: horizontal stopper 123: vertical stopper
124: shaft support 125: cover plate
130: Turnover bed 130a: Front bed part
130b: rear bed part 131: bed rotating shaft
140: Hydraulic cylinder for turnover
210: Hydraulic cylinder for holder 211: Rod
220: Prismatic member 221: Side
222: first holder piece guide groove 223: hollow
224: first spring guide pipe
230: holder piece 231: first guide projection
232: second guide projection
240: holder piece guide plate 241: second holder piece guide groove
250: hydraulic cylinder for stopper 251: rod
260: Platen
270: spring
280: stopper mounting plate 281: stopper
282: hollow 283: second spring guide tube
290: video camera 291: connection line
292: Video receiver
320: inverted pyramid member 321: side surface
321a: Auxiliary stopper guide groove
330: Auxiliary stopper 331: Guide projection
340: Support plate
350: auxiliary spring
360: auxiliary supporting pipe

Claims (5)

A pair of body frames disposed on the upper portion of the base frame, the pair of body frames being disposed to face each other, and a pair of body frames disposed on both sides of the body frame to house the propeller, A turntable hydraulic cylinder provided between the base frame and the turnover bed for rotating the turnover bed, a propeller fixed to the turnover bed for fixing the hub portion of the propeller, Means;
The propeller fixing means includes a hydraulic cylinder for a holder provided on the turnover bed, a truncated pyramid member mounted on a rod of the hydraulic cylinder for the holder and moving up and down, and a pyramid member mounted on each side of the truncated pyramid member, And a holder piece which moves in a radial direction in accordance with the upward / downward movement and can be tightly fixed to the inner circumferential surface of the propeller hub portion;
Wherein the hydraulic cylinder for the holder is a hollow hydraulic cylinder, a hydraulic cylinder for a stopper is further provided below the hydraulic cylinder for the holder, and a rod of the hydraulic cylinder for the stopper is disposed along the inside of the hydraulic cylinder for the holder and the truncated pyramid Wherein a stopper plate is provided on an upper portion of the pyramidal member through a spring, and a plurality of stoppers are rotatably provided on the stopper mounting plate, The stopper is changed to a horizontal posture or a vertical posture by being separated from the pressure plate by the pressure plate;
A large propeller turnover device.
A pair of body frames disposed on the upper portion of the base frame, the pair of body frames being disposed to face each other, and a pair of body frames disposed on both sides of the body frame to house the propeller, A turntable hydraulic cylinder provided between the base frame and the turnover bed for rotating the turnover bed, a propeller fixed to the turnover bed for fixing the hub portion of the propeller, Means;
The propeller fixing means includes a hydraulic cylinder for a holder provided on the turnover bed, a truncated pyramid member mounted on a rod of the hydraulic cylinder for the holder and moving up and down, and a pyramid member mounted on each side of the truncated pyramid member, And a holder piece which moves in a radial direction in accordance with the upward / downward movement and can be tightly fixed to the inner circumferential surface of the propeller hub portion;
Wherein the hydraulic cylinder for the holder is a hollow hydraulic cylinder, a hydraulic cylinder for a stopper is further provided below the hydraulic cylinder for the holder, and a rod of the hydraulic cylinder for the stopper is disposed along the inside of the hydraulic cylinder for the holder and the truncated pyramid Wherein a pressure plate is provided at an upper end of a rod of the hydraulic cylinder for the stopper and is mounted on a rod of the hydraulic cylinder for the stopper and an inverted truncated pyramid member is provided below the pressure plate, An auxiliary stopper mounted to be slidable along each side is provided and an auxiliary spring for elastically supporting the auxiliary stopper is provided on an upper portion of the truncated pyramid member;
A large propeller turnover device.
3. The method according to claim 1 or 2,
A bed rotating shaft is provided on both sides of the turnover bed so that the turnover bed can rotate with respect to the body frame, the turnover bed includes a front bed portion extending forward with respect to the bed rotating shaft, The extension of the axial center of the hub portion of the propeller is arranged to pass through the rear bed portion of the turnover bed and the rear bed portion extends longer than the extension length of the front bed portion, And the overhead hydraulic cylinder is connected to the rearward edge of the rear bed portion of the bed for turning over.
3. The method of claim 2,
Wherein the video camera is provided with a video camera on an upper portion of the pressure plate, the video camera is a hollow hydraulic cylinder, and the video camera is connected to the outside through a connecting line passing through the inside of the stopper hydraulic cylinder, Of the propeller turnover device.
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