JPH0316924Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drag head device suitable for use in a drag suction dredger or the like.

[Conventional technology]

There are various types of mud suction port 4 (usually referred to as a drag head) of the drag suction dredger 1 shown in Fig. 2, but the type used when the underwater bottom ground is hard and compact is the type. It has been proposed that a drag head is equipped with a rotary cutter indicated by a locus circle 8 of the cutting edge of the cutter (hereinafter referred to as the cutting edge circle) as shown in FIG.

A drag head equipped with a rotary cutter (hereinafter referred to as a drag head with a cutter) consists of a suction mouth 5, a drag head case 6, and a cutter. In FIG. 3, reference numeral 7 indicates a hydraulic motor for driving the cutter, and reference numeral 10 indicates a sled for sliding the drag head along the bottom surface of the water to keep the excavation depth 11 constant. This drag head with a cutter is connected at a flange 12 to a drag arm 3 shown in FIG. Note that the reference numeral 2 in Fig. 2 indicates a mud storage.

The depth 11 excavated by the cutters of the drag head with cutters shown in FIG. 3 is the distance between the bottom of the sled 10 and the lowest end of the cutting edge circle 8. always remains constant. However, when the subsoil becomes extremely hard, the power required for excavation increases, so the excavation depth may be reduced to 11 mm as necessary.
may be made shallower. A drag head device with cutters proposed to enable such operations is shown in FIGS. 4 and 5.

The state shown in FIG. 4a is exactly the same as that shown in FIG. 3, and shows the deepest excavation state. Figure 4b
shows the condition when digging shallowly, sled 10
An excavation depth adjustment plate 13 with a triangular cross section is attached below to lift the cutter upward. Although the excavation depth 11 can be appropriately changed using the device shown in FIG. There is a drawback that it is necessary to prepare many types of depth adjustment plates 13.

What has been proposed to overcome these drawbacks is shown in FIG. In the case shown in FIG. 5, the sled 10 is divided into two parts, and the two parts are connected by a hinge 14. Figure 5a shows the deepest digging state. When digging shallowly, as shown in Fig. 5b, 2
The divided sled is opened and the lower sled member 15 is slid along the soil surface. In this way, the cutter is lifted upward and the distance between the lower end of the lower member 15 and the lower end of the cutting edge circle 8 is shortened, so that the excavation depth 11 becomes shallower. The device shown in FIG. 5 can change the excavation depth 11 more easily than the device shown in FIG. 15 and the hinge 14 slide in contact with the bottom of the water,
The hinge 14 has a disadvantage in that it is susceptible to damage due to wear and impact, and therefore the durability of the hinge 14 is poor.

[Problem that the invention attempts to solve]

The present invention is an attempt to solve these problems, and aims to provide a drag head device with a cutter that allows adjustment of the excavation depth by a simple means and has improved warpage strength, durability, etc. shall be.

[Means for solving problems]

Therefore, the drag head device with a cutter of the present invention has a suction mouth at the lower end of the drag arm.
A drag head case rotatably coupled via a pivot portion, a rotary cutter provided in the drag head case, and a sled attached to a lower part of the drag head case, A sled restraining mechanism, wherein the front portion of the sled is rotatably coupled to the drag head case via a second pivot joint, and capable of restraining the sled at a desired angle with respect to the drag head case; The sled restraining mechanism is interposed between the rear part of the sled and the drag head case, and includes a perforated plate provided at the rear part of the drag head case and having a plurality of holes, and a perforated plate provided at the rear part of the drag head case, and It is characterized by comprising a fixed eye plate and a bolt for fixing the eye plate of the sled to a required hole position of the perforated plate.

[Effect]

In the drag head device with cutters of the present invention described above, the angle of the sled whose front part is rotatably connected to the lower part of the drag head case is adjusted by the angle of the sled interposed between the rear part of the sled and the drag head case. By adjusting the bolt operation of the restraint mechanism, the excavation depth of the cutter can be appropriately set according to the hardness of the seabed soil.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figs. 1a and 1b are side views showing the operating state of a drag head device with a cutter as an embodiment of the present invention.

As shown in FIGS. 1a and 1b, the drag head case 6 is attached to the suction mouse 5 at the first pivot point 27.
are rotatably connected via. Note that the suction mouse 5 has a drag arm (reference numeral 3 in Fig. 2).
(see) is fixed at the bottom edge.

A rotary cutter indicated by a cutting edge circle 8 and a hydraulic motor 7 are provided inside the drag head case 6, and a sled 1 is provided at the bottom of the drag head case 6.
0 is provided.

The sled 10 has a drag head case 6 at its front.
an eye plate 19 provided on the sled 10 side;
It is rotatably coupled via a second pivot joint formed by an eye plate 20 and a pin 21 provided on the side plate 25 of the drag head case.

The sled 10 is connected to the drag head case 6 between the rear part of the sled 10 and the drag head case 6.
A warp restraining mechanism is provided that can restrain the warp at a desired angle.

This sled restraining mechanism is provided at the rear of the drag head case 6, and includes a perforated plate 22 with a plurality of holes 23, an eye plate 10a fixed to the rear of the sled 10, and an appropriate combination of the perforated plate 22. It consists of a bolt 24 for fixing the eye plate 10a of the sled 10 at the hole position.

With the above-described configuration, when the seabed soil is relatively soft and deep digging is possible, as shown in FIG. It is rotated around the pin 21 of the second pivot portion and fixed with the bolt 24 of the warp restraining mechanism.

In addition, if the soil on the seabed is relatively hard and only shallow digging is possible, use a sled 10 as shown in Figure 1b.
is rotated around the pin 21 of the second pivot joint so that its rear part is lowered to the minimum extent possible with respect to the lower end of the cutter cutting edge circle 8, and is fixed with the bolt 24 of the warpage restraining mechanism. .

As described above, in the drag head device with cutters of the present invention, the angle of the sled 10, whose front part is rotatably coupled to the lower part of the drag head case 6, is interposed between the rear part of the sled 10 and the drag head case 6. By adjusting the extremely simple warpage restraint mechanism consisting of the eye plate 10a, the perforated plate 22, and the bolt 24 by operating the bolts, the excavation depth 11 of the cutter indicated by the cutting edge circle 8 can be adjusted to the hardness of the seabed soil 9. It is set appropriately depending on the situation.

[Effect of idea]

As described in detail above, according to the drag head device with a cutter of the present invention, the drag head case is rotatably coupled to the suction mouth at the lower end of the drag arm via the first pivot joint, and A rotary cutter is provided in the case, and a sled is attached to the lower part of the drag head case, and the front part of the sled is rotatable to the drag head case via a second pivot joint. a sled restraining mechanism that is operably coupled to restrain the sled at a desired angle with respect to the drag head case;
a perforated plate with a plurality of holes interposed between the rear part of the sled and the drag head case, and an eye plate fixed to the rear part of the sled; With a simple structure consisting of a bolt for fixing the eye plate of the sled to a predetermined hole position of a perforated plate, the following effects and advantages can be obtained.

(1) The excavation depth can be adjusted appropriately by adjusting the attitude of the sled relative to the cutter according to the soil quality of the seabed by operating the bolts of the sled restraint mechanism.

(2) Compared to conventional excavation depth adjustable drag head devices, there is no need for a complicated structure such as dividing the sled into a fixed part and a movable part, and there is no reduction in strength.

(3) The pivot joint between the drag head case and the sled can be located above the sled, so the pivot joint is not directly damaged by the bottom of the water, greatly improving durability.

(4) The sled restraint mechanism includes a perforated plate provided at the rear of the drag head case with a plurality of holes, an eye plate fixed to the rear of the sled, and a perforated plate provided with the required number of holes on the perforated plate. Since it is comprised of a bolt for fixing the eye plate of the sled at the hole position, it can be manufactured extremely simply and at low cost.

[Brief explanation of drawings]

Figures 1a and b are side views showing the operating state of a drag head device with cutters as an embodiment of the present invention, and Figure 2 is a side view showing the working state of a dredger equipped with a drag head device with cutters. Figures 3 to 5 show a conventional drag head device with cutters. Figure 3 is a side view thereof, Figures 4a and 4b are side views showing its excavation state, and Figures 5a and 5 are
FIG. 3b is a side view showing another conventional drag head device with cutters and its excavating state. 1...Drag suction dredger, 2...Mud storage,
3...Drag arm, 4...Drag head, 5...
...Suction mouse, 6...Drag head case, 7...Hydraulic motor, 8...Cut cutting edge circle, 9
...Underwater ground, 10... Sled, 10a... Eye plate, 11... Excavation depth, 12... Flange,
13... Excavation depth adjustment plate, 14... Hinge, 15
... Sled bottom member, 16 ... Hole, 17 ... Plate, 18
...Bolt, 19,20...Eye plate, 21
... Pin, 22 ... Perforated plate, 23 ... Hole, 24
...Bolt, 25...Drag head case side plate,
27... Pivot joint.

Claims (1)

[Scope of utility model registration request] The drag head case includes a drag head case rotatably connected to a suction mouse at the lower end of the drag arm via a first pivot joint, and a rotary cutter provided in the drag head case. a sled attached to a lower portion of the sled, the front portion of which is rotatably coupled to the drag head case via a second pivot joint to rotate the sled at a desired angle with respect to the drag head case. A sled restraint mechanism capable of restraining the sled is interposed between the rear part of the sled and the drag head case, and the sled restraint mechanism is provided at the rear part of the drag head case and has a plurality of holes drilled therein. A cutter comprising a perforated plate, an eye plate fixed to the rear part of the sled, and a bolt for fixing the eye plate of the sled at a required hole position of the perforated plate. Includes drag head device.