JPS6343258Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drag head device with a cutter used in a self-propelled suction dredger, and more particularly to a drag head device with a cutter suitable for use in dredging work on hard soil.

In general, a self-propelled suction dredger has a drag head body 3 attached to the tip of a drag arm 2 grounded to seabed soil 4, as shown in Figure 1 (schematic diagram), and the seabed soil 4 is removed by a dredging pump installed inside the ship. Dredging is carried out while suctioning and storing it in the hopper 1.

By the way, as the drag head main body 3, a California type drag head 5 as shown in FIG. 2 (side view) has conventionally been used. The seabed soil can be dredged by the scouring effect, in which seabed soil is excavated and moved by the jet water flow.

In addition, the reference numeral 7 in FIG. 2 indicates a claw, and the reference numeral 8 indicates an inlet member.

However, such conventional draghead devices have the disadvantage that their dredging ability is significantly reduced when the seabed soil is hard and compact.

Therefore, a drag head device with a cutter equipped with a rotary cutter has been developed.

FIG. 3 (longitudinal sectional view) shows an example of the above-described drag head device with cutters.

In this cutter-equipped drag head device, seabed soil 4 is excavated by a large number of cutters 11 provided in a case 9.

In FIG. 3, reference numeral 10 indicates an inlet member, P indicates the flow of seawater to the inlet member 10, and Q indicates the direction of movement of the drag head with cutter.

The blades of the conventional drag head device with cutters are shown in Fig. 4 (front view), Fig. 5 (cross-sectional view taken along the - arrow in Fig. 4), and Fig. 6 (cross-sectional view taken along the - arrow in Fig. 4). as shown in Figure 7 (side view) and Figure 8 (front view in the direction of - arrow in Figure 7).
The ones shown are used. The cutter shown in Figures 4 to 6 is used when excavating relatively soft seabed soil, and has a large number of blades 1 between 12 disks.
1 is placed.

In this example of the blade 11, the blade 11 does not change in the width direction of the cutter, but there is also a type that has a twist in order to smooth the digging force of the cutter.

Further, the cutter shown in FIGS. 7 and 8 is used for hard seabed soil, and has a tooth row-shaped blade 13 instead of a knife-shaped blade. This blade 1
In the example No. 3, there are six blades 13 in the circumferential direction, arranged in seven rows in the cutter width direction, and a total of 42 blades 13 are arranged.

The cutter is generally attached as shown in FIG. That is, the blade 11 or 13
The cutter rotor 14 is connected to the shaft 15 via bolts 20. Power from a hydraulic motor 17 is transmitted to the shaft 15 via an output shaft 16 . Note that there is also one in which the cutter rotor 14 and shaft 15 are integrated.

Since the cutter rotor 14 of such a conventional cutter drag head is integrated,
In order to remove the cutter rotor 14, it is necessary to remove the hydraulic motor 17, bearing 19, shaft 15, etc. from the cutter rotor 14 in advance.

By the way, in actual dredging work, the cutter rotor 14 may be damaged or wires may become wrapped around the cutters 11 and 13, making it necessary to remove the cutter rotor 14. However, with the conventional drag head with cutters, the above-mentioned circumstances arise. Therefore, it takes a lot of time to remove the cutter rotor 14,
There is a problem in that the time during which dredging is not possible increases.

The present invention is an attempt to solve these problems, and aims to provide a drag head device with a cutter that allows the cutter to be easily and quickly attached and removed.

For this reason, the cutter-equipped drag head device of the present invention is equipped with a rotary cutting cutter for digging inside the drag head body, and the cutter is removably fitted into a rotor that is removably mounted on a support shaft at both ends of the cutter. It is composed of a large number of donut-shaped support plates attached together, a large number of blades attached to the outer periphery of the support plates via holders, and a spacer arranged between the support plates, and the above-mentioned The rotor is composed of a pair of rotor end portions each having an inner peripheral flange removably connected to the flange portions of the support shafts at both ends, and a rotor center portion disposed between these rotor end portions. , the rotor center portion is fixed to the outer circumferential flange of the rotor end portion via the support plate removably connected.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figures 10 to 14 show a drag head device with a cutter as an embodiment of the present invention.
Fig. 10 is a perspective view showing the main parts, Fig. 11 is an exploded perspective view of the support plate and blade, Fig. 12 is a sectional view showing the arrangement of the cutter rotor and support plate, and Fig. 13 is the spacer. A perspective view showing the first
FIG. 4 is a perspective view showing the split spacer.

A rotary cutter C for excavation as shown in FIGS. 10 to 14 is installed inside the drag head main body as shown by reference numeral 3 in FIG. , a blade 13 and spacers 24 and 26.

The cutter rotor shaft S is mounted on support shafts 15 at both ends, and a donut-shaped support plate 21 is fitted onto the cutter rotor shaft S.

In other words, the key 25 of Katsuta rotor shaft S
The support plate 21 is attached to the cutter rotor shaft S so that a key groove 26 formed on the inner circumference of the donut-shaped support plate 21 is engaged with the support plate 21. , are locked in the circumferential direction, so that the rotational force of the cutter rotor shaft S is transmitted to the donut-shaped support plate 21.

On the other hand, in the axial direction of the cutter rotor shaft S, the support plate 21 is capable of sliding along the cutter rotor shaft S, and can be moved on the cutter rotor shaft S or pulled out from the cutter rotor shaft S as necessary. It is now possible to take and take.

A large number of holders 22 are provided on the outer periphery of the support plate 21, and a large number of blades 13 are attached to the support plate 21 via each of these holders 22.

Further, between the support plates 21 attached to the cutter rotor shaft S, a ring-shaped spacer 2 is provided.
4 is fitted into the cutter rotor shaft S.

This ring-shaped spacer 24 is designed to be held between the support plates 21 when the cutter C is installed in the drag head main body.
It is designed to rotate together with 1.

On the other hand, the cutter rotor shaft S is divided into three parts: a rotor center part 29 and a pair of rotor end parts 30.
A flange portion 30a having an inner circumferential flange 30b and an outer circumferential flange 30c is formed at the 9-side end.

The rotor end portion 30 is removably fixed to the support shaft 15 by connecting the inner peripheral flange 30b and the flange portion 15a of the support shaft 15 with bolts 28.

On the other hand, support plates 21' having bolt holes are fitted to both ends of the rotor central part 29, and the outer periphery of the rotor end 30 is connected to the support plates 21' via bolts 27 attached to the bolt holes. flange 30
c are removably fixed to each other, whereby the pair of rotor end portions 30 and the rotor center portion 29, which are divided into three parts, are integrally connected.

A split spacer 26 as shown in FIG. 14 is installed between the support plates 21' on both sides of the rotor central portion 29 and the support plate 21 installed inside the support plates 21'.

Since the cutter-equipped drag head device of the present invention is constructed as described above, when removing the cutter rotor shaft S from the support shaft 15 in order to remove the cutter C inside the drag head body, the following procedure is required. Let's do it.

First, the split spacers 26 attached to both ends of the rotor central portion 29 are removed. Next, the parts group constituted by the support plate 21 and the spacer 24 on the inner side of the bolted support plate 21' are shifted toward one end as a whole, and the distance between the support plate 21' and the support plate 21 is widened. Make work easier. Next, the support plate 21' and the rotor end 3 with a wider spacing
Remove the bolt 27 that was connecting the outer peripheral flange 30c of the cutter c from the center side of the cutter c. Then, perform the same operation on the other end, and then
9 is moved outward along the end surface of the rotor end 30 and removed.

After removing the rotor center portion 29 in this manner, the bolt 28 is removed from the cutter center side. Then, the rotor shaft both ends 30 can be moved toward the center of the cutter, and can be pulled out from the shaft 15 toward the center of the cutter to completely remove the cutter rotor shaft S from the drag head body.

Note that the bolts 28 are attached to the flange portion 1 of the support shaft 15 so as not to become an obstacle when removing the rotor center portion 29.
5a and the inner peripheral flange 30b of the rotor end 30
When the bolt 28 is attached to the rotor center part 29 side, the bolt 28 is attached to the flange part 30 of the rotor end part 30.
a Make sure that it does not come out from the end surface.

Further, when attaching the cutter rotor shaft S to the support shaft 15, the above-mentioned operation is performed in reverse order.

After removing the cutter C from the drag head main body as described above, remove the support plates 21, 21' and the spacer 24 from the cutter rotor shaft S of the cutter C, and remove the spacer 24 of a different size.
The cutter C can be changed to a new cutter C by replacing it with new cutter component parts such as new support plates 21 and 21' and attaching it to the cutter rotor shaft S again.

As described in detail above, according to the cutter-equipped drag head device of the present invention, a rotary cutting cutter for excavation is provided inside the drag head body, and the rotor is removably mounted on the support shafts at both ends of the cutter. A large number of donut-shaped support plates that are removably fitted to the rotor, a large number of blades that are attached to the outer periphery of the support plates via holders, and spacers that are arranged between the support plates. The rotor is comprised of a pair of rotor end portions each having an inner peripheral flange removably connected to the flange portions of the support shafts at both ends, and a rotor disposed between these rotor end portions. It has a simple structure in which the rotor center is fixed to the outer peripheral flange of the rotor end via the support plate that is detachably connected to the outer peripheral flange of the rotor end, and the hydraulic motor, support shaft, etc. can be removed. This has the advantage that only the cutter can be easily attached or removed from the drag head body without having to do so.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the working state of a self-propelled suction dredger, Figs. 2 to 9 show conventional drag head devices, Fig. 2 is a side view of the device as an example, and Fig. 3 is a vertical cross-sectional view showing the improved drag head device with cutters shown in Figure 2, and Figure 4 is a front view showing the cutter for excavating soft seabed soil.
Figure 5 is a cross-sectional view taken along the - arrow in Figure 4, Figure 6 is a cross-sectional view taken in the - arrow direction of Figure 4, Figure 7 is a side view showing a cutter for excavating hard seabed soil, and Figure 8 is a cross-sectional view taken in the - arrow direction of Figure 4. 7 is a front view as viewed from the - arrow; FIG. 9 is a front view of the drag head device with cutter shown in FIG. 3;
Figures 1 to 14 show a drag head device with a cutter as an embodiment of the present invention. Figure 10 is a perspective view showing the main parts thereof, Figure 11 is an exploded perspective view of its support plate and blade, and Figure 12. 13 is a perspective view showing the spacer, and FIG. 14 is a perspective view showing the split spacer. 1... Hopper, 2... Drag arm, 3... Drag head body, 4... Seabed soil, 13... Teeth in the form of a row of teeth, 14
...Katsuta rotor, 15... Support shaft, 15a... Flange portion of support shaft, 16... Output shaft, 17... Hydraulic motor, 2
0... Bolt, 21, 21'... Support plate, 22... Holder, 24... Spacer, 25... Key, 26... Split type spacer, 27, 28... Bolt, 29... Rotor center, 30... Rotor end, 30a... Flange portion at the end of the rotor, 30b...Inner flange at the end of the rotor, 30c...Outer flange at the end of the rotor, C...Cut, S...Cut rotor shaft.

Claims (1)

[Scope of utility model registration request] A rotary cutter for excavation is provided inside the drag head body, and the cutter has a rotor that is removably mounted on a support shaft at both ends of the cutter, and a number of donut-shaped support plates that are removably fitted to the rotor. , the rotor is composed of a large number of blades attached to the outer periphery of the support plate via holders, and spacers arranged between the support plates, and the rotor is connected to the flanges of the support shafts at both ends. A pair of rotor end portions each having an inner circumferential flange detachably connected to the rotor end portion, and a rotor center portion disposed between these rotor end portions, the rotor center portion being connected to the rotor end portion. Fixed via the support plate removably connected to the outer peripheral flange of the
Drag head device with cutter.