JPH08127388A - Work ship - Google Patents

Abstract

PURPOSE: To easily fine adjust an advancing direction by a thruster. CONSTITUTION: A direction changing device 17 of turning a propeller 13 of a rear side thruster 9 in right/left directions is provided. A turning range of the propeller 13 is set from a position of directing one of the right/left directions of a hull 2 to pass through a rearward directing position toward the rearward of the hull so as to lead to a position directing the other of the right/left directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work boat provided with a thruster that generates a water flow in the left-right direction of a hull and changes the direction of the hull.

[0002]

2. Description of the Related Art Conventionally, as a work ship equipped with a thruster, there is a seaweed cultivation work ship, for example. This seaweed aquaculture work vessel has a structure in which a guide for seaweed nets is obliquely projected into the sea ahead of the bow, and this guide is advanced so as to enter below the seaweed nets on the surface of the sea so that the seaweed nets are guided onto the ship. Was becoming. In addition, the seaweed net guided on the ship moves on the seaweed net guide from the bow side to the stern side as the hull further advances, and is returned from the stern to the sea surface. Was cut and the seaweed was cut and then acid-treated by an acid-treatment device. The seaweed cutting device and the acid treatment device were provided on the seaweed net guide.

In a conventional seaweed aquaculture work vessel, when the seaweed net is moved forward to guide it onto the ship, the direction of the hull may deviate from the extending direction of the seaweed net due to the influence of wind and ocean current. While the main propulsion device such as a drive device was moving at a slow speed, the thruster was used to finely adjust the horizontal direction of the hull.

This thruster is constructed so that a propeller driven by a hydraulic motor with its axial direction oriented in the left-right direction is rotated in the forward or reverse direction to generate a water flow in either the left-right direction or the left-right direction. It was installed.
And, in the conventional seaweed aquaculture work boat, this thruster was mainly placed only in the front part of the hull, but in recent years, it has been provided in both the front part and the rear part of the hull in order to improve the turning performance. Came. In the thruster provided at the rear of the hull, the propeller portion was projected downward from the rear of the bottom of the ship.

The thruster hydraulic motor is constructed such that hydraulic pressure is supplied from a hydraulic pump driven by the engine of the main propulsion device. Therefore, the rotation speed of the thruster also increases or decreases according to the rotation of the engine. When switching the rotation of the propeller between normal rotation and reverse rotation, the hydraulic circuit for supplying hydraulic pressure to the hydraulic motor is switched between normal and reverse.

[0006]

However, in the seaweed cultivation work vessel constructed as described above, there is a problem that the traveling direction is finely adjusted by the front and rear thrusters while guiding the seaweed net onto the ship. That is, at this time, the thrust of the main propulsion device is kept relatively small because the hull needs to be advanced at a very low speed, but if the engine speed in the main propulsion device is low, the rotation speed of the thruster will also be low, and the thruster This is because it becomes difficult to obtain thrust.

On the other hand, auxiliary machinery such as seaweed reaper is also driven by hydraulic pressure supplied from a hydraulic pump driven by engine power. Therefore, when engine speed is lowered, rotation of auxiliary machinery such as seaweed reaper is reduced. Work will be hindered.

Further, when switching from the forward drive state to the reverse drive, it is necessary to lower the rotational speed of the engine for the main propulsion device to about the idling rotational speed before operating the forward / reverse switching device. When the seaweed reaping device and the chemical liquid supply pump are driven by hydraulic pressure, the output of these hydraulic devices will decrease.

Further, if the thruster at the rear of the hull is provided so as to project downward from the rear of the bottom of the ship, there is also a problem that this becomes a resistance when sailing.

The present invention has been made in order to solve such problems, and a first object thereof is to obtain a work boat in which the traveling direction can be finely adjusted by a thruster. In addition, when adopting a configuration in which the auxiliary propulsion equipment such as the seaweed reaper is driven by the power of the engine for the main propulsion device in the seaweed aquaculture work vessel, make sure that the operating conditions of the auxiliary equipment do not change during cruising or switching between forward and reverse. The second purpose is to do so. Further, a third object is to prevent the thruster from being a resistance at the time of traveling when installing the thruster on the hull.

[0011]

A work boat according to a first aspect of the present invention is a work boat in which a propeller of a thruster is directed from one position in one of the left and right directions of a hull to a other position through a rearward directed position facing the rear of the hull. Since the direction changing device for rotating in the rotation range up to is provided, the hull can be slantly and delicately moved by rotating the propeller in the rotation range.

A work boat according to a second aspect of the present invention is the work boat according to the first aspect of the present invention, which is used as a seaweed aquaculture work boat provided with a seaweed net guide for guiding the seaweed net from the bow side to above the bridge, and is used for the main propulsion device. And a structure for transmitting power to either one of a main propulsion device for an engine and an auxiliary drive device having a function of converting engine power into a flow of a transmission medium to transmit to a driven member and controlling the driven member. In addition, since the thruster is driven by the accessory drive device, the power of the engine for the main propulsion device is transmitted to the accessory drive device, and this power is converted to the flow of the transmission medium. Since it is supplied to the thruster, the thrust required by the thruster can be obtained by increasing or decreasing the engine speed. At this time, the direction of the hull is changed to the left or right by changing the direction of the propeller of the thruster by the direction changing device. Further, by positioning the propeller of the thruster at the rearward-directed position that faces the rear of the hull, it is possible to move at a slow speed.

A work boat according to a third aspect of the present invention is the work boat according to the first or second aspect of the present invention, wherein thrusters are provided at a front portion and a rear portion of the hull, and the thruster is provided on one of the thrusters. Since the direction changing device is provided, the propeller of one thruster can be positioned at the rearward-directed position facing the rear of the hull to generate a water flow backward, while the other thruster can generate a water flow laterally.

A work boat according to a fourth aspect of the present invention is the work boat according to any one of the first to third aspects of the present invention, wherein a concave portion opened downward is formed in the hull, and the concave portion is formed in the concave portion. Since the thruster propeller equipped with a direction changing device is faced, and the thruster is provided with a vertical movement device for vertically moving the propeller between the inside of the recess and the outside of the recess and below the bottom of the recess, Since the propeller of the thruster is raised by the moving device to be housed in the recess, there is no one protruding downward from the bottom of the ship, so that the hull can move smoothly with respect to seawater.
Further, by projecting the propeller of the thruster downward from the recess, the propeller can receive water for generating thrust.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment Hereinafter, an example of an embodiment of a work boat according to the present invention will be described in detail with reference to FIGS. 1 to 8. In this embodiment, an example in which the present invention is applied to a seaweed aquaculture work vessel will be described.

FIG. 1 is a view showing a ship for seaweed cultivation work as a work ship according to the present invention. FIG. 1 (a) is a side view and FIG. 1 (b) is a plan view. 2 is an enlarged side view showing the front part of the seaweed aquaculture work vessel, FIG. 3 is an enlarged side view showing the center part in the front-rear direction, and FIG. 4 is an enlarged side view showing the rear part. 2 to 4, a part of the hull is broken and drawn.

FIG. 5 is an enlarged plan sectional view showing a joint portion of the seaweed net guide, and FIGS.
-The joint part A-joint part F in FIG. 4 are each shown. 6A and 6B are schematic configuration diagrams showing an up-and-down state of the bridge. FIG. 6A shows a state where the bridge is positioned at a low position, and FIG. 6B shows a state where the bridge is positioned at a high position. The figure shows VI- in FIG.
It is drawn with the hull broken along line VI. FIG. 7 shows FIG.
FIG. 8B is a sectional view taken along line VII-VII of the main part of the rear thruster in FIG. 8B, and FIG. 8 is a sectional view taken along line VIII-VIII of the main part in FIG. 7.

In these drawings, reference numeral 1 shows a seaweed aquaculture work vessel according to this embodiment. The seaweed aquaculture work vessel 1 mainly cuts seaweed. Reference numeral 2 denotes a hull of the seaweed aquaculture work vessel 1, 3 denotes a bridge, and 4 denotes a seaweed net guide for guiding the seaweed net onto the ship.

As shown in FIG. 1 (b), a hydraulically driven front thruster 5 for changing the direction of the hull by generating a water flow in the left-right direction is attached to the front part of the bottom of the hull 2.
A stern drive device 8 including an engine 6 and a drive unit 7 and a hydraulic drive type rear thruster 9 are attached to the rear portion of the hull 2. The stern drive device 8 constitutes the main propulsion device according to the present invention. Further, a hydraulic pump 10 is connected to the output shaft of the engine 6 in addition to the drive unit 7, and a power transmission destination of the engine 6 is transmitted by a switching device (not shown) interposed in the power transmission path. The drive unit 7 and the hydraulic pump 10 can be switched to either one.

The hydraulic pressure outlet of the hydraulic pump 10 communicates with this hydraulic pump 10 and a hydraulic circuit device 11 constituting a drive device for an auxiliary machine according to the present invention. This hydraulic circuit device supplies hydraulic pressure to each auxiliary machine (front side thruster 5, rear side thruster 9, bridge lifting device, seaweed reaping device which will be described later), and the operating direction, output or displacement amount of each of these auxiliary machines. Is configured to be controlled by using various hydraulic devices such as an electromagnetic switching valve. In addition, the operating direction of the hydraulic motor and hydraulic cylinder used in each auxiliary machine,
Since the configuration for controlling the output or the displacement amount is well known in the related art, detailed description thereof will be omitted here.

That is, in the auxiliary machine drive device shown in this embodiment, the power of the engine 6 is changed to the flow of the hydraulic oil using the hydraulic oil as a transmission medium, and the driven members (the hydraulic motors and hydraulic cylinders of the respective auxiliary machines) are driven. Is configured to communicate. In addition to the hydraulic oil as the transmission medium, an electric current may be used as the transmission medium. In this case, a generator is used instead of the hydraulic pump 10, and each auxiliary machine has an electric structure.

The front thruster 5 has a structure in which a propeller 5a having its axis lined in the left-right direction is rotated by a hydraulic motor (not shown) in the cabin, and projects downward at the center of the ship bottom in the left-right direction. The propeller 5a faces the inside of the horizontal water passage formed in the central protrusion 2a.
A screen (not shown) for preventing foreign matter in the sea from hitting the propeller 5a is provided at the left and right openings of the left-right water passage. This screen is formed by combining stainless steel pipes in a grid pattern.

The hydraulic pressure for driving the hydraulic motor of the front thruster 5 is supplied from the hydraulic circuit device 11. Further, in the front thruster 5, the propeller 5a is switched between normal rotation and reverse rotation by switching the hydraulic circuit in the hydraulic circuit device 11 between forward and reverse, and the hull 2
Is capable of turning in either left or right direction.

The rear thruster 9 is shown in FIG. 7 and FIG.
As shown in FIG. 3, the recess 12 is formed in the transom 2b of the hull 2 so as to penetrate the upper wall 12a of the recess 12. As shown in FIG. 1 (b), the recess 12 is located in the rear portion of the hull 2 at a position biased to the right and left in the left-right direction.
As shown in (3), the corner portion where the bottom surface 2c of the hull and the transom 2b intersect is formed so as to be partially recessed upward, and is opened downward and rearward.

The rear thruster 9 has a propeller 13 rotatably attached to a lower end thereof and is rotatable and axially (vertical) on the upper wall 12a via a cylindrical support member 14.
A thruster body 15 movably attached to the hull, a vertical movement device 16 for vertically moving the thruster body 15 with respect to the hull 2, a direction changing device 17 for rotating the thruster body 15 around an axis extending in the vertical direction, and the like. It consists of

The thruster body 15 has a circular cross section and is fitted into the tubular support member 14.
5a and a propeller driving hydraulic motor 15b fixed to the lower end of the main spindle pipe 15a. The upper portion of the main spindle pipe 15a is a slider 16a of the vertical moving device 16.
Is rotatably connected in a state in which the movement in the vertical direction is restricted. Although not shown, the spindle pipe 1
A seal member that prevents seawater from entering the hull is provided at a fitting portion between the 5a and the tubular support member 14. Also,
The oil passage of the hydraulic motor 15b has a main shaft pipe 15
The joint 15c at the upper end of the main shaft pipe 15a and the oil hose 15 connected to the joint 15c are extended upward in a.
It communicates with the hydraulic circuit device 11 via d and the like.

That is, in this thruster body 15,
Hydraulic motor 1 for propeller driving by hydraulic circuit device 11
5b is driven and the propeller 13 rotates.
Then, by switching the rotation direction of the hydraulic motor 15b by the hydraulic circuit device 11 between the forward and reverse directions, the rotation direction of the propeller 13 is also switched between the forward and reverse directions.

The vertical moving device 16 includes the slider 1
6a, a pair of left and right round rod-shaped guide rods 16b and 16b that vertically penetrate the slider 16a, and a slider 16
It is composed of a feed screw 16d that vertically extends by being screwed into a nut member 16c fixed to a, and a vertical movement hydraulic motor 16e that is gear-coupled to the upper end of the feed screw 16d. The guide rods 16b, 16b have their lower ends fixed to the upper wall 12a, and their upper ends fixed to the hull 2 via a support plate 18.

The feed screw 16d has an upper end rotatably supported by the support plate 18 and a lower end rotatably supported by the upper wall 12a. In addition, the feed screw 16d is formed such that the upper end thereof penetrates the support plate 18 and is projected upward from this, and the handle lever 19 (FIG. 8) can be attached to the projecting end. That is, by attaching the handle lever 19 to the feed screw 16d and turning it,
6d can be manually rotated. The vertical movement hydraulic motor 16e is supported and fixed to the hull 2 via a bracket (not shown). The oil passage of the vertical movement hydraulic motor 16e is also communicated with the hydraulic circuit device 11 via an oil hose (not shown).

In other words, according to the vertical movement device 16, the vertical movement hydraulic motor 16e is driven by the hydraulic circuit device 11, so that the hydraulic motor 16e is moved.
Is transmitted to the feed screw 16d, and the slider 16a having the nut member 16c screwed to the feed screw 16d moves up and down along with the thruster body 15 along the guide rod 16b. The vertical movement device 16 is provided between a raised position shown by solid lines in FIGS. 7 and 8 and a lowered position where most of the propellers 13 project downward from the hull bottom surface 2c as shown by a chain double-dashed line in FIG. The thruster body 15 can be moved up and down. In addition,
The vertical movement device 16 has a structure in which the thruster body 15 can be lifted from the lowered position only when the propeller 13 is positioned within a rotation range of about 10 degrees to the left and right with respect to the position facing the rear. There is. This is propeller 1
This is to prevent 3 from hitting the left and right side walls 12b of the recess 12 when rising.

The thruster body 15 can be manually moved up and down by rotating the feed screw 16d with the handle lever 19. Also, FIG.
The chain double-dashed line L shown inside is the sea surface when traveling.

The direction changing device 17 has a structure in which the thruster body 15 is rotated around its axis by a hydraulic cylinder. This hydraulic cylinder is configured by connecting a pair of left and right single-acting cylinder bodies 17a via a common piston rod, and the cylinder body 17a is supported and fixed to the slider 16a of the vertical moving device 16 and is attached to the piston rod. An integrally provided rack 17b is meshed with a pinion 17c of the main shaft pipe 15a. Also,
The cylinder body 17a has a structure in which pressure oil is supplied only to the extension side, and this oil passage has an oil hose 17d.
It is connected to the hydraulic circuit device 11 via. Further, in the direction changing device 17, the propeller 13 has the recess 12
The thruster body 15 cannot be rotated when it is housed in. This prevents the propeller 13 from hitting the left and right side walls 12b of the recess 12.

That is, according to the direction changing device 17, the left and right cylinder bodies 17 are placed in a state where the thruster body 15 is positioned at the lowered position by the vertical movement device 16.
By supplying hydraulic pressure from the hydraulic circuit device 11 to the cylinder body 17a on the right side in FIG. 7 of a, the thruster body 15 rotates clockwise when viewed from above in the axial direction. Therefore, the hydraulic pressure is supplied to the left and right cylinder bodies 1
By switching with 7a, the thruster body 15 rotates clockwise or counterclockwise from the position shown in FIG.

Further, the direction changing device 17 is set so that the maximum rotation angle of the thruster body 15 is about 180 degrees. More specifically, the propeller 13 goes from a position pointing to the right side of the hull as indicated by a chain double-dashed line 13R in FIG. 7 to a position pointing to the left side of the hull as indicated by 13L through a backward pointing position indicated by 13B. It is set to be rotated within a rotation range.

The bridge 3 is shown in FIGS. 3, 4 and 6.
As shown in FIG. 2, the ceiling portion 3a has a seaweed net guide 4 described later.
Is supported by the hull 2 via a hydraulic cylinder 20. The hydraulic cylinders 20 are arranged at four positions so as to correspond to the four corners of the bridge 3 formed in a substantially rectangular shape in plan view as shown in FIG.
The lower end of 0a is fixed to the hull 2 and the piston rod 20b
Is pivotally supported on the bridge bottom plate 3b. The oil passage of the hydraulic cylinder 20 communicates with the hydraulic circuit device 11 via an oil hose (not shown).

That is, by supplying the hydraulic pressure from the hydraulic circuit device 11 to the hydraulic cylinder 20 to extend the hydraulic cylinder 20, the bridge 3 rises as shown in FIG. 6B, and from this state, the hydraulic pressure is reversed. By shortening the cylinder 20, the bridge 3 is lowered as shown in FIG. 6 (a). The hydraulic cylinder 20 may be a single-acting type that extends by hydraulic pressure. In this case, by stopping the hydraulic pressure supply while the bridge 3 is raised, the bridge 3 is lowered by its own weight to the lowest position.

Reference numeral 21 is a seat on which an occupant is seated, 22
Is a slide type cover for closing an opening formed below the bridge 3 when the bridge 3 is raised, and 23 is a deck of the hull 2.

The seaweed net guide 4 is for guiding the seaweed net N floating on the sea surface L1 onto the ship, and is formed by combining stainless steel pipes. In addition, this seaweed net N is
It is connected to a pillar (not shown) erected on the sea floor via a guide rope. This guide rope has a sufficient length so that the seaweed net N can float on the sea surface even when the sea surface rises and falls due to the tide.

The seaweed net guide 4 is, as shown in FIGS. 1 to 4, connected to first to seventh connecting portions A to F.
It is formed by the rails 24 to 30, and the connecting portion A to
C and fifth and seventh rails 28 and 30 are supported with respect to the hull 2.

As shown in FIG. 1 (b), the first rail 24 has a main rail 24a, which is substantially V-shaped in plan view, arranged so that its front is convex, and a sub-rail 24b is hung inward. As shown in FIG. 2, the left and right sides of the rear end portion are formed so as to cross each other, and are connected to a support column 31 extending upward from the deck 23 via a bracket 24c so as to be rotatable about a horizontal axis. The mounting position of the first rail 24 is positioned such that the tapered portion on the rotating end side projects forward of the hull 2, as shown in FIG. 1 (b). In addition, as shown in FIG. 1A, the first rail 2
The reference numeral 4 is formed by bending it into a substantially V shape when viewed from the side, and is configured such that the tip end portion is submerged in the sea surface L1 when the rotating end portion is directed forward. This L1 indicates the sea level when the ship is in an almost berthed state.

That is, when the nori net N is pulled up, the first rail 24 is in a state in which the rotating end is submerged in the sea surface L1 as shown by the solid line in FIGS. At the time of round trip to the sea area where the net exists, as shown by the chain double-dashed line in Fig. 2, the rotation axis a (Fig. 2)
Is rotated to the rear.

As shown in FIG. 1 (b), the second rail 25 is composed of a main rail 25a extending forward and backward on both left and right sides of the hull, and a sub-rail 25b arranged between the main rails 25a and 25a. The front end of the main rail 25a is connected to the bracket 24c of the first rail 24 via the connecting portion A, and the rear end is connected to the third rail 26 via the connecting portion B.

The connecting portion A is, as shown in FIG.
The horizontal connecting shaft 32, which is erected on the bracket 24c of the first rail 24, is fitted into the elongated hole 33 of the main rail 25a of the second rail 25 while adopting a retaining structure. As a result, the front end of the second rail 25 is
With respect to the above, it is connected so as to be rotatable about the axis line in the left-right direction and movable in the longitudinal direction.

The third rail 26 is composed of a pair of left and right pipe members, and its front and rear ends are connected to the second rail 25 and the fourth rail 27 via connecting portions B and C, respectively. .

The connecting portion B is, as shown in FIG.
The horizontal connecting shaft 34 erected at the rear end of the rail 25 is fitted into the elongated hole 35 at the front end of the third rail 26 while adopting a retaining structure. Therefore, the front end portion of the third rail 26 is connected to the second rail 25 so as to be rotatable about the axis line in the left-right direction and movable in the longitudinal direction.

The connecting portion C is, as shown in FIG.
The rear end of the rail 26 and the front end of the fourth rail 27 are rotatably connected to each other via a horizontal connecting shaft 36. The connecting portions B and C use brackets 38 and 39 of a seaweed reaping device 37, which will be described later, to prevent the rails from slipping off from the horizontal connecting shaft.

As shown in FIGS. 1 and 3, the fourth rail 27 includes a pair of left and right main rails 27a and reinforcing rails 27b, 27b provided below the main rails 27a, 27a.
27b and a cross pipe 27c that is bridged between these reinforcing rails 27b, 27b, the front end portion is connected to the third rail via the connecting portion C, and the rear end portion is a connecting portion. It is connected to the fifth rail 28 via D.

The fifth rail 28 is composed of a pair of left and right pipe members extending forward and backward through the bridge 3.
The ceiling part 3 of the bridge 3 via two columns 40 respectively
It is supported and fixed to a. The rear end of the fifth rail 28 is connected to the sixth rail 29 via the connecting portion E.

As shown in FIG. 5D, the connecting portion D connecting the fourth rail 27 and the fifth rail 28 has a horizontal connecting shaft 41 which is erected at the front end of the fifth rail 28 and which is The four rails 27 are fitted into the elongated holes 42 at the rear end of the four rails 27 while adopting a retaining structure. Therefore, the fourth rail 27
The rear end portion is connected to the fifth rail 28 so as to be rotatable about an axis line in the left-right direction and movable in the longitudinal direction.

The connecting portion E also has the same structure as the connecting portion D as shown in FIG. 5 (e). In the figure, 43 is a horizontal connecting shaft erected at the rear end of the fifth rail, and 44 is a sixth connecting shaft.
It is an elongated hole formed at the front end of the rail 29.

The sixth rail 29 is composed of a pair of left and right pipe members, the front end of which is connected to the fifth rail 28 via the connecting portion E, and the rear end of which is connected to the seventh rail 30.
Are connected via As shown in FIG. 5F, the connecting portion F is configured to rotatably connect the front end portion of the seventh rail 30 to the rear end portion of the sixth rail 29 via a horizontal connecting shaft 45. The seventh rail 30 is formed in a substantially U shape in a plan view as shown in FIG. 1 (b), and is in a state where the open portion is directed forward, as shown in FIG. It is supported and fixed to. The connecting portion F is also structured to be supported by the hull 2 via the support columns 47.

Further, the connecting portion B of the guide 4 for seaweed net,
The seaweed cutting device 37 connected to C has a conventionally known structure for cutting the seaweed from the seaweed net by rotating a not-shown cutting blade around a horizontal axis by a hydraulic motor. The oil passage of the hydraulic motor used in the seaweed cutting device 37 is also connected to the hydraulic circuit device 11. As shown in FIG. 2, this seaweed cutting device 37 is connected to the seaweed net guide 4 via the brackets 38 and 39 as described above, and is also used between the deck 23 of the hull 2 and the seaweed cutting device. An elevating device 48 is interposed.

The mowing device elevating / lowering device 48 includes a total of four elevating / lowering guides 49 vertically and telescopically configured by a telescopic type, and two left and right hydraulic cylinders 50 for elevating the seaweed mowing device 37. It consists of and. The hydraulic cylinder 50 is of a double-acting type, and the oil passage of the cylinder body 50a communicates with the hydraulic circuit device 11.

That is, hydraulic pressure is supplied to the cylinder body 50a by the hydraulic circuit device 11, and the hydraulic cylinder 50a
The seaweed cutting device 37 is raised to the rising position shown by the solid line in FIG. 2, and the hydraulic cylinder 50 is shortened from this rising state, whereby the seaweed cutting device 37 is moved to the two-dot chain line in FIG. It will descend to the descending position indicated by.

When the seaweed cutting device 37 moves up and down, the seaweed net guide 4 connected via the connecting portions B and C is also moved up and down. Here, the lifting operation of the seaweed net guide 4 will be described.

Since the fifth rail 28 is integrally provided with the bridge 3, the nori net guide 4 is arranged such that the bridge 3 is moved up and down by the hydraulic cylinder 20 so that the central portion in the longitudinal direction moves up and down. Become. That is,
By raising the bridge 3 and the seaweed cutting device 37 from the lowered state of the bridge 3 shown in FIG.
As shown by the solid line in FIGS. 2 to 4, the seaweed net guide 4 is in the raised state.

At this time, the angle formed by the adjacent rails changes, but this angle change is absorbed by the rotation of one rail with respect to the other rail at each of the connecting portions A to F. Along with this, the dimensional difference that occurs due to the rails between the connecting portions A and F rising relative to the connecting portions A and F whose vertical movement is restricted is At E, the other rail shifts with respect to the one rail, and is absorbed.

The bridge 3 and the seaweed cutting device 37
It is also possible to raise only one of them, instead of raising both of them. When the seaweed reaper 37 is lowered and only the bridge 3 is raised, the fourth rail 27 inclines forward and downward as shown by the chain double-dashed line 27A in FIG. As shown by the solid line, it will slope backward and downward.

When only the seaweed cutting device 37 is raised with the bridge 3 in the lowered position, the second rail 25 inclines forward and downward as shown by the solid line in FIG. As shown by the alternate long and two short dashes line 27B, it is inclined downward and rearward. 2 to 4, a chain double-dashed line 4A indicates the position of the nori net guide when both the bridge 3 and the nori cutting device 37 are positioned at the lowered position. Further, the chain double-dashed line 3A indicates the bridge position in the lowered position.

The operation of the seaweed cultivation work vessel 1 configured as described above will be described. When the seaweed net is pulled up on the ship and the seaweed is mowed, first, the first rail 24 of the seaweed net guide 4 is rotated so that its tip is submerged in the sea, and the bridge 3 and the seaweed cutting device 3 are used.
Adjust the vertical position of 7 so that the seaweed net guide 4 is at the position corresponding to the tide. That is, the sea level is high at or near high tide, and there is little room for the guide ropes that connect the seaweed net N to the stanchions, and the seaweed net N cannot be pulled higher than the water surface. I'll do it.

On the other hand, at low tide or in a state close to this, the guide rope has a large margin contrary to the above. Therefore, the nori net N is prevented from being displaced with respect to the nori cutting device 37 by raising the nori net guide 4. To

After adjusting the height of the nori net guide 4 in this way, the nori net N is maneuvered so that the nori net N is positioned in front of the tip of the first rail 24, and the tip of the first rail 24 is moved to the nori net N. Move forward to sneak in below. At this time, the front thruster 5 and the rear thruster 9 are used. That is, the switching device of the engine 6 is switched to transmit power to the hydraulic pump 10, and the hydraulic circuit device 11 controls the front and rear thrusters 5 and 9.

At this time, the propeller 5 of the front thruster 5
By rotating a normally or reversely, the front part of the hull 2 moves in either the left or right direction. In addition, the device for changing the direction of the propeller 13 of the rear thruster 9 is used.
By changing to either left or right by 7, the rear part of the hull 2 moves leftward or rightward. When the vehicle moves forward or backward, the propeller 13 of the rear thruster 9 is rotated forward or backward in the state of being directed backward as shown in FIG. The rear thruster 9 can be moved forward or backward even if the direction in which the propeller 13 is directed is shifted from right behind to left or right.

When the seaweed aquaculture work vessel 1 is moved forward in this way, the seaweed net N rides on the first rail 24, and the seaweed aquaculture work vessel 1 is further moved forward to move the first rail 2
The second rail 25 and the third rail 26 on the rear side from 4 reach the seaweed reaping device 37. At this time, when the seaweed net N reaches above the seaweed cutting device 37, the seaweed hanging from the seaweed net N is cut off. The cut seaweed is stored in the deck 23.

Then, as the hull 2 further rises and moves forward, the seaweed net N from which the seaweed has been cut off is moved from the fourth rail 27 to the fifth rail 28 to the sixth rail 29 to the seventh rail 3.
It follows the route of 0 and moves backward on the ship, and descends from the rear end of the seventh rail 30 to the sea surface.

When the sea level rises or falls due to the ebb and flow of the tide during the cutting operation, the bridge 3 and the seaweed cutting device 37 are moved up and down accordingly to adjust the vertical position of the seaweed net guide 4.

When the mowing operation is completed and the vehicle returns to the harbor (the same applies when going from the harbor to the sea area with the seaweed net), the bridge 3 is positioned in the ascending position and the seaweed reaping device 37 is in the lower position. It is positioned so that the distance from the bridge 3 can be easily seen. At the same time, the first rail 24 of the seaweed net guide 4 is rotated so that its tip end gets on the ship. In addition to this, the rear thruster 9 is installed in the propeller 1 by the vertical movement device 16.
The thruster body 15 is moved to the upper side so that the propeller 13 is housed in the recess 12 of the hull 2 after the position of 3 is turned rearward.

Thereafter, the switching device of the engine 6 is switched so that the power transmission destination is the drive unit 7, and the main propulsion device 8 is used to drive. In addition, during high speed navigation,
Since the seawater is separated from the bottom surface 2c of the hull at the corners indicated by reference numeral 2A in FIG. 8, the propeller 13 of the rear thruster 9 is not splashed with the seawater at this time. That is, the rear thruster 9 does not become a resistance when traveling.

When the pier is to be used with the bow facing the pier, the bridge 3 and the seaweed reaper 37 are raised and the first rail 24 of the seaweed net guide 4 is used.
It is possible to get on and off across the first rail 24 by rotating the to the front side and putting the tip on the wharf.

Therefore, in this seaweed cultivation work vessel 1, the engine 6 for the main propulsion device 9 is configured to transmit power to either the drive unit 7 or the hydraulic pump 10, and the hydraulic drive type rear thruster 9 is used. Is configured so that thrust can be obtained in the front, rear, left, and right directions. Therefore, if the destination of the power of the engine 6 for the main propulsion device 8 is the hydraulic pump 10,
Even if the engine speed is increased to drive auxiliary equipment such as the seaweed reaping device 37, the hydraulic pressure sent from the hydraulic pump 10 to the rear thruster 9 is controlled so that the rear thruster 9 can obtain a desired thrust. (Lower) makes it possible to run at a very slow speed.

In other words, the seaweed reaping device 37 can be used even when the vehicle is moving forward at a slow speed, when moving backward at a slow speed, or when switching between forward and backward movement.
It is possible to maintain auxiliary equipment such as the above in a desired operating state.

The rear thruster 9 has a vertical moving device 1
6 is provided so that the propeller 13 moves up and down with respect to the recessed portion 12, so that the propeller 13 is mounted on the recessed portion 12 during traveling.
By storing it in the ship, there is no one projecting downward in the rear part of the ship bottom, so that the hull can move smoothly with respect to seawater. By projecting the propeller 13 of the rear thruster 9 downward from the recess 12, the propeller 13 can receive water for generating thrust.

Further, in this embodiment, since the bridge 3 and the seaweed cutting device 37 are configured to be vertically movable so that the vertical position of the seaweed net guide 4 can be adjusted, the sea area in which the height difference of the sea surface due to the tide is large. Even when seaweed is cultivated in, it is possible to continue cutting the seaweed for a long time. This is because the cutting operation can be performed while adjusting the vertical position of the seaweed net guide 4 according to the height of the sea surface.

Moreover, since the distant view can be seen when only the bridge 3 is raised, there is also an advantage that the visibility can be secured at the time of traveling and the maneuvering can be facilitated.

Second Embodiment The propeller of the thruster provided at the front of the hull can also be configured to be rotatable left and right. This embodiment will be described with reference to FIG. FIG. 9 is a side view showing another embodiment in which the front thruster is configured to be vertically movable and directionally changeable. In FIG. 9, the same or equivalent members as those described in FIGS. 1 to 8 are designated by the same reference numerals. And detailed description is omitted.

The front thruster 5 shown in FIG. 9 has a structure similar to that of the rear thruster 9 described in the first embodiment, and the hull 2 is provided by a vertical moving device and a direction changing device (not shown). It is mounted so that it can move vertically and change its direction. More specifically, the front thruster 5 extends in the vertical direction between a position projecting downward from the ship bottom as shown by a solid line in FIG. 9 and a position housed inside the hull 2 as shown by a broken line in FIG. You can move to. Along with this, the front thruster 9 has a solid line from the position where the propeller 5a is directed in one of the left and right directions of the hull 2 shown by the chain double-dashed line in FIG. 9 when the propeller 5a is projected downward from the bottom of the ship. As shown by (3), the hull 2 can be turned within a turning range through a backward pointing position facing the rear of the hull 2 to a position pointing the other side.

When the front thruster 5 is constructed so that its direction can be changed, the rear thruster does not necessarily have to be provided. In other words, it is not necessary to provide thrusters on both the front and rear portions of the hull 2, and a thruster may be attached to at least one of the front and rear of the hull 2 so that the thrusters can change directions. Further, even when the thrusters are provided on both the front and the rear of the hull 2, the thrusters on the front side of the hull are not changeable but the thrusters on the front side of the hull are changeable. You may.

Further, in the above-described embodiment, an example in which the present invention is applied to a seaweed aquaculture work vessel is shown.
It can also be applied to a type of ship other than the seaweed aquaculture work ship, that is, a general fishing ship or a ship that performs special work.

[0079]

As described above, the work boat according to the first aspect of the present invention directs the propeller of the thruster from the position in which the propeller of the thruster is directed in one of the left and right directions of the hull to the other in a rearward directed position in which the propeller of the thruster is directed to the rear of the hull. Since the direction changing device that rotates in the rotation range to reach the position is provided, the hull can be slightly and delicately moved by rotating the propeller in the rotation range. Therefore, it is possible to obtain a work boat in which the traveling direction can be finely adjusted by the thruster.

A work boat according to a second aspect of the present invention is the work boat according to the first aspect of the present invention, which is used as a seaweed aquaculture work boat equipped with a seaweed net guide for guiding the seaweed net from the bow side to above the bridge. And a structure for transmitting power to either one of a main propulsion device for an engine and an auxiliary drive device having a function of converting engine power into a flow of a transmission medium to transmit to a driven member and controlling the driven member. In addition, since the thruster is driven by the accessory drive device, the power of the engine for the main propulsion device is transmitted to the accessory drive device, and this power is converted to the flow of the transmission medium. Since it is supplied to the thruster, the thrust required by the thruster can be obtained by increasing or decreasing the engine speed. At this time, the direction of the hull is changed to the left or right by changing the direction of the propeller of the thruster by the direction changing device. Further, by positioning the propeller of the thruster at the rearward-directed position that faces the rear of the hull, it is possible to move at a slow speed.

Therefore, in adopting the structure in which the thruster is driven by the power of the engine for the main propulsion device, the operating condition of the auxiliary machine such as the seaweed reaping device can be maintained at the desired operating condition at the time of the slow forward movement.

Further, when the propeller of the thruster is positioned at the rearward-directed position facing the rear of the hull, the forward / reverse can be switched by switching the forward / reverse rotation direction of the propeller. Switching of the advance is performed while transmitting the power of the engine to the drive device for the auxiliary machine. Therefore, when the auxiliary drive device drives an auxiliary machine such as a seaweed mowing device, the output of the auxiliary machine does not decrease during operation even if the forward / reverse movement is switched. That is, it is possible to maintain the operating state of the auxiliary equipment such as the seaweed reaping device at a desired operating state even when switching between forward and reverse.

A work boat according to a third aspect of the present invention is the work boat according to the first or second aspect of the present invention, wherein thrusters are provided at a front portion and a rear portion of a hull, and the thruster is provided on either one of the thrusters. Since the direction changing device is provided, the propeller of one thruster can be positioned at the rearward-directed position facing the rear of the hull to generate a water flow backward, while the other thruster can generate a water flow laterally. Therefore, the direction of the hull with respect to the left-right direction can be finely adjusted while moving forward at a slow speed.

A work boat according to a fourth aspect of the present invention is the work boat according to any one of the first to third aspects of the present invention, wherein a concave portion opened downward is formed in the hull and the concave portion is formed in the concave portion. Since the thruster propeller equipped with a direction changing device is faced, and the thruster is provided with a vertical movement device for vertically moving the propeller between the inside of the recess and the outside of the recess and below the bottom of the recess, Since the propeller of the thruster is raised by the moving device to be housed in the recess, there is no one protruding downward from the bottom of the ship, so that the hull can move smoothly with respect to seawater.
Further, by projecting the propeller of the thruster downward from the recess, the propeller can receive water for generating thrust. Therefore, when installing the thruster, this does not become a resistance when sailing.

[Brief description of drawings]

FIG. 1 is a view showing a seaweed cultivation work ship as a work ship according to the present invention, in which FIG. 1 (a) is a side view and FIG. 1 (b) is a plan view.

FIG. 2 is an enlarged side view showing the front part of the seaweed aquaculture work vessel.

FIG. 3 is a side view showing an enlarged center portion in the front-rear direction of the seaweed aquaculture operation vessel.

FIG. 4 is an enlarged side view showing a rear portion of a seaweed aquaculture operation ship.

5 is an enlarged plan sectional view showing a joint portion of the seaweed net guide, and FIGS. 5A to 5F show joint portions A to F in FIGS. 1 to 4, respectively. .

FIG. 6 is a schematic configuration diagram showing an up-and-down state of the bridge. FIG. 6A shows a state in which the bridge is positioned at a low position,
The figure (b) has shown the state which has positioned the bridge in the high position. The drawing is drawn with the hull broken along the line VI-VI in FIG. 1 (b).

FIG. 7 shows a main part of the rear thruster in FIG.
FIG. 7 is a sectional view taken along line VII-VII.

8 is a sectional view taken along the line VIII-VIII of the main part in FIG.

FIG. 9 is a side view showing another embodiment in which the front thruster is configured to be vertically movable and directionally changeable.

[Explanation of symbols]

1 ... Nori aquaculture work boat, 2 ... Hull, 2c ... Hull bottom surface, 3
... bridge, 4 ... seaweed net guide, 5 ... front thruster, 6 ... engine, 8 ... main propulsion device, 9 ... rear thruster, 10 ... hydraulic pump, 11 ... hydraulic circuit device, 12 ... recess, 13 ... propeller, 16 ... Vertical moving device, 17 ... Direction changing device.

Claims (4)

[Claims] 1. A work boat provided with a thruster that changes the direction of a hull by generating a water flow in the left-right direction of the hull, and a propeller of the thruster is directed rearward of the hull from a position in which the propeller of the thruster is directed in one of the left-right direction of the hull. A work boat provided with a direction changing device for turning within a turning range from a pointing position to a position pointing to the other. 2. The work boat according to claim 1, wherein the work boat is a seaweed cultivation work boat equipped with a seaweed net guide that guides the seaweed net from the bow side to above the bridge, and the main propulsion device engine is used for main propulsion. And a structure for transmitting power to any one of a device and an auxiliary device drive device that has a function of converting engine power into a flow of a transmission medium and transmitting the same to a driven member and controlling the driven member. A work boat having a structure in which a thruster is driven by an auxiliary drive device. 3. The work boat according to claim 1 or 2, wherein thrusters are provided at a front portion and a rear portion of the hull, and a propeller is directed to one of the thrusters in one of the left and right directions of the hull. A work boat provided with a direction changing device for turning within a turning range from a turning position to a position pointing to the other through a backward pointing position facing the rear of the hull. 4. The work propeller for a thruster according to claim 1, wherein a concave portion opened downward is formed in the hull, and the concave portion is provided with a direction changing device. And a vertical moving device for moving the propeller up and down between the inside of the recess and the outside of the recess and below the bottom of the ship.