JPS6224186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for assembling a cylindrical frustoconical structure, such as a stern nozzle, which is installed near the periphery of a screw in the stern of a ship, among other conical structures.

Conventionally, a cylindrical truncated conical structure has been formed by, for example, two halves that are formed using a press machine or the like and then joined together.

It has been difficult to obtain high precision in the conical structures that can be manufactured by the above-mentioned conventional methods.

For example, the stern nozzle is placed near the periphery of the screw and improves the propulsion performance of the vessel by the water flow flowing along its surface.The wide open end located at the front in the bow and stern direction is perpendicular to the axis. It is cut on an inclined surface that is different from the normal plane, and the cross-sectional shape of the shell portion is wing-like, requiring extremely high precision.

The object of the present invention is to provide a conical structure in which a cylindrical truncated conical structure can be assembled with high accuracy and efficiency by assembling within a rotating drum and while rotating the rotating drum, with the outer peripheral surface as a reference. An object of the present invention is to provide an assembly method and device for.

In order to achieve the above object, the present invention provides a rotary drum which is arranged at predetermined intervals in the circumferential direction in a rotating drum arranged such that its rotational axis is oriented in the vertical direction, and inclined from the inner side of the lower end to the outer side of the upper end. A plurality of columnar receiving jigs are positioned such that their inner edges can be supported along the outer periphery of a cylindrical truncated conical structure in an inverted position within a rotating drum, and the inner edges of the receiving jigs are The outer surface material of the conical structure is placed along the outer surface of the conical structure, the outer surface material is temporarily joined to the receiving jig, the aggregate is placed on the outer surface material and the two are temporarily joined, and then the rotating drum is Lay it on its side and place it on the rotating means so that the axis is facing horizontally,
Welding the outer surface materials to each other and the outer surface material and the aggregate while rotating and stopping around the horizontal axis, and further welding the inner surface material onto the aggregate while the rotating drum is placed on the rotating means. This is a method of assembling a cylindrical truncated conical structure, and a plurality of cylindrical truncated conical structures are arranged inside the rotating drum at predetermined intervals in the circumferential direction and are inclined from the inside at one end to the outside at the other end. A columnar receiving jig is provided, and position setting means capable of approaching and separating from the rotational axis of the rotary drum are provided at one end and the other end of the receiving jig, and the inner edge of the receiving jig is arranged in a cylindrical shape. The truncated conical structure is configured to be supportable along the outer periphery of the truncated conical structure, and is provided with a rotating means for rotating the rotating drum around a horizontal axis of rotation.

In the above method and apparatus, the outer circumferential portion of the cylindrical truncated conical structure is supported by the inner edge of the position-adjustable receiving jig provided in the rotating drum, and the rotating drum is aligned with the horizontal axis of rotation. Since the conical structure is welded and assembled while rotating and stopping around the machine, welding can be done in a fixed position, and centering is also easy.
Cylindrical truncated conical structures can be assembled efficiently and with high precision.

An embodiment of the present invention will be described below based on the drawings.

1 is a cylindrical rotating drum having a rotation axis 0, and has a radial reinforcing frame 3 at one end. Reference numeral 2 denotes, for example, 12 columnar receiving jigs arranged at equal intervals on the circumference of the rotational axis 0 inside the rotating drum 1, and one end of which is connected to a connecting frame 4 provided on the reinforcing frame 3. The other end is connected to the pin hole 5 of the drum 1 via a pin 6, and the other end is connected to the rotating drum 1.
The other end is connected to an adjustment screw 7 provided in the axis 0 direction, and each receiving jig 2 is set in an inclined posture such that the other end is further away from the axis 0. Further, this receiving jig 2 is designed so that the front and rear inclination angle of each receiving jig 2 with respect to the axis 0 can be adjusted by selecting the pin hole 5 and rotating the adjusting screw 7. The connecting portion between the tip of the adjusting screw 7 and the receiving jig 2 is rotatably connected to the adjusting screw 7. Reference numeral 8 denotes a manhole hole formed on the outer peripheral surface of the rotary drum 1 for construction work and weight reduction.

Reference numeral 9 denotes a stern nozzle assembled with this device, which has a cylindrical truncated conical shape consisting of an outer surface material 9a, an aggregate 9b, and an inner surface material 9c, and the outer surface material is attached to the inner edge 2a of the receiving jig 2. 9a is supported and assembled.

Reference numeral 10 denotes a roll that can rotate this rotating drum 1 with its rotational axis 0 being horizontal, and includes an outer surface material 9a and an aggregate 9b temporarily joined to a receiving jig 2 in the rotating drum 1, and an inner surface material 9b. Welding is performed while rotating and stopping the surface material 9c.

Next, a method of assembling the stern nozzle 8 using this assembly device will be explained.

First, as shown in Fig. 1, the rotating drum 1 is placed upright on the floor so that the axis 0 faces vertically and the reinforcing frame 3 is located at the lower end, and each receiving jig 1 is adjusted. Then, the inner edge thereof is set at a position where it can be supported along the outer circumference of the stern nozzle 9 in an inverted position, that is, a position with one end (truncated head) positioned downward. After that, the outer surface material 9a is placed along the inner edge 2a of the receiving jig 2, and the outer surface material 9a is temporarily joined to the receiving jig 2..., and then the aggregate 9b is placed on the outer surface material 9a. Then, the aggregate 9b and the outer surface material 9a are temporarily joined together, and the aggregates 9b are temporarily joined together. Thereafter, the rotating drum 1 is raised so that its axis 0 faces horizontally, and the rotating drum 1 is rotated into a roll 1 as shown in FIG.
Place it on top of 0. At that time, adjustment screw 7... is set to roll 1.
Rotating drum 1 is positioned outward from one end of 0.
Put on. Then, while the rotating drum 1 is rotated and stopped by the roll 10, the outer surface material 9a is
The outer surface material 9a and the aggregate 9b are welded together, and then the inner surface material 9c is placed on the aggregate 9b, and the inner surface materials 9c and the aggregate are welded together. The work of arranging the inner surface material on the aggregate may be carried out with the rotary drum 1 taken down from the roll 10 as shown in FIG. Furthermore, inner surface material 9c, aggregate 9
b and the inner surface material 9c are welded with the rotating drum 1 placed on the roll 10. The stern nozzle 9 assembled in this way is taken out of the rotating drum 1.

As described above, according to the present invention, the outer circumference of the cylindrical truncated conical structure is held by the inner edges of the plurality of holding jigs arranged at predetermined intervals in the circumferential direction of the rotating drum. The rotating drum is rotated and stopped while welding and assembling with the axis horizontally, so the welding position can be made easier by rotating the rotating drum around the horizontal axis during welding, and the conical Centering of the structure can be easily performed, and as a result, conical structures such as a stern nozzle can be assembled with high precision.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention.
The figure is a vertical cross-sectional view of the rotating drum showing the state at the time of temporary welding, Figure 2 is a schematic overall front view showing the state at the time of welding, Figure 3 is a front view of the same main part, and Figure 4 is a rear view of the same main part. It is. 0... Rotating shaft center, 1... Rotating drum, 2... Receiving jig,
2a...inner edge, 4...connection frame, 5...pin hole,
6...pin, 7...adjustment screw, 9...stern nozzle, 9a
... Outer surface board, 9b... Aggregate, 9c... Outer surface board, 10
…roll.

Claims (1)

[Scope of Claims] 1. A plurality of columnar receivers arranged at predetermined intervals in the circumferential direction in a rotating drum arranged such that the rotational axis is oriented in the vertical direction, and inclined from the inner side of the lower end to the outer side of the upper end. A jig is positioned so that its inner edge can be supported along the outer periphery of a cylindrical truncated conical structure in an inverted position within a rotating drum, and the jig is positioned so that its inner edge can be supported along the outer circumference of a cylindrical truncated conical structure in an inverted position. Arrange the outer surface material of the structure, temporarily bond this outer surface material to the receiving jig, place aggregate on the outer surface material and temporarily bond them together, and then rotate the rotating drum so that its axis is horizontal. The rotating drum is placed on the rotating means so as to face in the same direction, and while rotating and stopping around the horizontal axis, the outer surface materials and the outer surface materials and the aggregate are welded together, and the rotating drum is then placed on the rotating means. A method for assembling a conical structure, comprising assembling a cylindrical truncated conical structure by welding an inner surface material onto the aggregate in a placed state. 2. A plurality of columnar receiving jigs are provided in the rotating drum at predetermined intervals in the circumferential direction and are inclined from inwardly at one end of the rotating drum to outwardly at the other end, and one end and the other end of the receiving jigs are provided. a position setting means capable of approaching and separating from the rotational axis of the rotating drum is provided, and the inner end edge of the receiving jig is configured to be supportable along the outer circumference of the cylindrical frusto-conical structure; An apparatus for assembling a conical structure, characterized in that a rotating means for rotating the rotating drum around a horizontal axis of rotation is provided.