JPS6124600Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drag arm swinging portion of a dredger, and particularly to a restraining device for a trunnion socket thereof.

Generally speaking, in a drag suction dredger, the trunnion socket, which is suspended from the upper end of the trunnion davit on the ship at the swinging out part of the drag arm, shakes when the ship rolls or tilts, causing the trunnion to become unstable. This may cause damage to the bottom end of the socket, etc.

The present invention is an attempt to solve these problems, and when the drag arm swings out due to the tilting of the trunnion davit, the trunnion socket can be swung out without any trouble, and the lateral side of the hull is maintained. It is an object of the present invention to provide a trunnion socket restraining device which can sufficiently prevent the trunnion socket from shaking during shaking.

Therefore, the trunnion socket restraint device of the present invention can be used at the drag arm swinging part of a dredger.
A trunnion socket connected to the drag arm is suspended from the upper end of the trunnion davit on the ship via a first pivot point, and a trunnion socket is attached to the trunnion socket to restrain movement of the trunnion socket. A rigid backstay is provided having an upper end pivotally connected via a second pivot point spaced from the first pivot point, the lower end of the backstay being pivoted on board the ship via a third pivot point. The first, second and third pivot points and a fourth pivot point that pivots the lower end of the trunnion davit onto the ship,
It is characterized by being placed at each vertex of a parallelogram.

Hereinafter, a trunnion socket restraining device in a drag arm swinging portion of a dredger as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a front view thereof, and FIG. 2 is an explanatory view showing its operation.

As shown in FIG. 1, a trunnion davit 1 on a ship is provided so as to be swung out of the ship by a hydraulic cylinder 2 as shown by a chain line. A trunnion socket 3 is suspended via one pivot point a.

This trunnion socket 3 is connected to a drag arm 5 via a sliding trunnion 4.

Further, a roller 6 attached to the lower end of the trunnion socket 3 is guided along a curved guide rail 7 when the trunnion socket 3 is swung out as shown by the chain line.

A wire rope 11 with a sliding trunnion 4 and a drag arm 5 suspended from one end is wrapped around the top sheave 8, intermediate sheave 9, and lower sheave 10 of the trunnion davit 1, and the wire rope 11 has a wire rope 11 suspended from the other end. After passing through the lower sheave 10, it is guided to a winch (not shown).

Furthermore, the upper end of a rigid backstay 12 is pivotally connected to an arm 13 that projects obliquely upward at the top of the trunnion socket 3 via a second pivot point b that is spaced apart from the first pivot point a. The lower end of this backstay 12 is connected to the third
It is pivotally connected via the pivot point c.

Note that instead of providing the arm 13 as a separate member, a projecting portion having the same function as the arm 13 is integrally formed on the trunnion socket 3, and the upper end of the backstay 12 is connected to the trunnion via the second pivot point b. It may also be pivoted directly to the above-mentioned protruding portion of the socket 3.

That is, the second pivot point b is the first pivot point a.
The trunnion socket 3 and the upper end of the backstay 12 are directly or indirectly pivotally connected to each other at a position separated from the trunnion socket 3 and the upper end of the backstay 12.

Then, connect the first, second, and third pivot points a, b, and c and the lower end of the trunnion davit 1 onto the ship (deck 14).
The fourth pivot point d, which is pivoted to the top), is located at each vertex of the parallelogram.

As a result, even when the trunnion davit 1 rotates outboard by the extension operation of the hydraulic cylinder 2 and the payout operation of the wire rope 11 when the drag arm 5 is swung outboard, the first to fourth pivot points a, b, c, d are always located at each vertex of a parallelogram and perform parallel link movement.

In other words, as shown in Figure 2, the line segment ab at the storage position A is always parallel to the line segment cd fixed on the ship until it assumes the position of line segment a'b' at the maximum swing position B. As a result, the attitude of the trunnion socket 3 with respect to the hull is kept constant.

Therefore, even if the ship's hull rolls when the drag arm 5 swings out, the roller 6 at the lower end of the trunnion socket 3 will not apply an impact to the guide rail 7, and the trunnion socket 3 can be smoothly moved to the position shown by the chain line.

The reason why the trunnion socket 3 continues to take a constant attitude with respect to the hull is explained as follows.

That is, in FIG. 1, when the trunnion socket 3 tries to rotate clockwise relative to the hull about the first pivot point a, this rotation is prevented by the tensile resistance of the rigid backstay 12, and vice versa. If the trunnion socket 3 attempts to rotate counterclockwise relative to the hull, this rotation is prevented by the compression resistance of the rigid backstay 12.

Since the conventional dredger was not provided with the backstay 12, the trunnion socket 3 oscillated around the pivot point a when the ship was rolling.
As a result, there was a risk that the rollers 6 would impact the guide rails 7 and the like, causing damage.

According to the trunnion socket restraint device of the present invention, as described above, the rigid backstay 12 that can restrain the movement of the trunnion socket 3 in the form of a parallel link mechanism is provided, so that the trunnion socket can be safely restrained even when the ship is shaking. There is an advantage that the swinging operation of the butt 3 and the drag arm 5 can be performed.

[Brief explanation of the drawing]

Figures 1 and 2 show a trunnion socket restraint device at the drag arm swinging part of a dredger as an embodiment of the present invention. Figure 1 is a front view of the device, and Figure 2 is an explanatory diagram showing its operation. be. 1... Trunnion davit, 2... Hydraulic cylinder, 3... Trunnion socket, 4... Sliding trunnion, 5... Drag arm, 6...
Roller, 7... Guide rail, 8... Top sheave, 9... Middle sheave, 10... Lower sheave,
11...wire rope, 12...backstay,
13... Arm, 14... Deck, a... First pivot point, b... Second pivot point, c... Third pivot point, d... Fourth pivot point.

Claims (1)

[Scope of utility model registration request] At the drag arm swinging part of the dredger, the trunnion socket connected to the drag arm is suspended from the upper end of the trunnion davit on the ship via the first pivot point, and the swing of the trunnion socket is controlled. The trunnion socket is provided with a rigid backstay having an upper end pivotally connected to the trunnion socket via a second pivot point spaced apart from the first pivot point, and the lower end of the backstay is connected to a third pivot point. The first, second and third pivot points and the fourth pivot point, which pivots the lower end of the trunnion davit onto the boat, are connected to the ship via the pivot points, and the first, second and third pivot points are connected to the ship on a parallelogram. A trunnion socket restraining device in a drag arm swinging portion of a dredger, characterized in that the device is disposed so as to be located at each vertex of the shape.