JP7847386B2 - Fishing net storage support system - Google Patents

Description

This invention relates to a fishing net storage assistance system.

For centuries, fishing has been carried out day and night to bring fish to our tables.

Among the various fishing methods, purse seine fishing, for example, involves forming a fleet of vessels including a net boat (main vessel), a search vessel, and a transport vessel. The fishing net surrounds a school of fish, and the net is gradually reclaimed onto the net boat, narrowing the area until a net-like enclosure is formed between the net boat and the transport vessel. The fish are then retrieved using a dip net. In the following explanation, the process of reclaiming most of the net onto the net boat from the main side and gradually narrowing the area is referred to as the first net-hauling process; the process of reclaiming the fish-catching side of the net using side rollers, following the net-hauling process, is referred to as the second net-hauling process; and the state where a net-like enclosure is formed is called the fish-loading form.

In the first net-hauling process, net-hauling machines located at the stern of the vessel and net-handling machines positioned above the net platform are used to retrieve the fishing nets that have been swung around by the net-handling machines and are now hanging down and drifting away, and then collect them on the net platform.

Furthermore, because the fishing net needs to be smoothly deployed during the next casting, multiple crew members guide each part of the net—for example, the float section, the main net section, and the sinker section—to the appropriate position on the net platform during retrieval.

However, guiding these fishing nets is physically demanding work, so labor-saving methods are desired.

Therefore, as described in Patent Document 1 below, for example, a net processing device has been proposed to assist in the deployment of the net body portion of a fishing net.

Japanese Patent Application Publication No. 04-183344

However, achieving sufficient labor savings is still difficult with such standalone machinery alone.

This invention has been made in view of the above circumstances, and provides a fishing net storage assistance system that can reduce labor in the first net hauling process.

To solve the above conventional problems, the fishing net storage assistance system according to the present invention includes: (1) a fishing net storage assistance system for lifting a fishing net from the sea and storing it on a net stand on the deck, the system comprising: a net lifting machine positioned at the stern of the deck for lifting the fishing net from the sea; a net handling device for further lifting the fishing net lifted by the net lifting machine above a net stand set on the deck, changing its direction, and lowering it; a float handling device for guiding the float side of the fishing net descending from the net handling device to the float area of the net stand; a sinking device for guiding the sinking side of the fishing net descending from the net handling device to the sinking area of the net stand; and when positioning the net body of the fishing net descending from the net handling device to the net body area of the net stand, the net body The net-hauling machine comprises a net-processing device for assisting deployment, a rotating drum having a substantially horizontal axis that slides against the fishing net and pulls it onto the ship, and a pair of guide rollers having a substantially vertical axis that are located upstream of the rotating drum to converge the fishing net, which has been deployed in an expansive manner toward the sea, to a width that can be wound up, the pair of guide rollers consisting of a sliding roller that guides the float side of the fishing net toward the rotating drum and a guide roller that guides the sinker side, and the diameter of the lower half of the guide roller is widened to a position where it substantially contacts a virtual plane that has the axis of the rotating drum as its normal and cuts the V-shaped bottom of the annular groove .

Furthermore, the fishing net storage assistance system according to the present invention also has the following features.
(2 ) The sinker area is an area set adjacent to the main net area on either the left or right side of the net platform, and the sinker processing device is provided in the form of a partition wall at the boundary between the sinker area and the main net area.
( 3 ) The sinker processing device is equipped with a sinker guide roller section that is movable along the partition wall-shaped device housing section, and the sinker guide roller section has a main roller that guides the sinker-side end of the sinker and a sub-roller that guides the net section closer to the float side than the sinker-side end, and the main roller is configured to rotate in the forward direction in which the sinker-side end is guided toward the sinker area, while the sub-roller is configured to rotate in the reverse direction in which the net section is guided toward the net area.
( 4 ) The net processing device comprises a net processing roller having friction surfaces on one and the other sides of a rotatable rod-shaped body that are oppositely threaded, and a support part that supports the net processing roller so as to contact the net portion of the fishing net hanging down from the net handling device, wherein the support part is a cantilevered arm having its base on the side of the hull on the float area side.
( 5 ) The ship shall be equipped with a side-mounted fishing net winding device for tightening the fishing net when loading fish.
( 6 ) The side fishing net winding device comprises a side roller arranged along one side of the hull and a fish tightening roller that rotates in contact with the rotating surface of the side roller.
( 7 ) The net handling device is configured to loop the hoisted fishing net around the drum section of a net handling machine installed at the tip of the crane device and lower it down, and the drum section is composed of a left drum section and a right drum section, and each drum section is made capable of rotating at different speeds.
Furthermore, in the net hauling machine according to the present invention, (8) a net hauling machine positioned at the stern of the deck and used to haul fishing nets out of the sea, comprising: a rotating drum having a substantially V-shaped annular groove on its circumferential surface and a substantially horizontal axis for hauling the fishing net onto the ship while sliding it in contact with it; and a pair of guide rollers having a substantially vertical axis provided upstream of the rotating drum to converge the fishing net, which has been cast out in an expansive manner toward the sea, to a width that can be wound up, wherein the pair of guide rollers consists of a sliding roller that guides the float side of the fishing net toward the rotating drum and a guide roller that guides the sinker side, and the diameter of the lower half of the guide roller is widened to a position where it substantially contacts a virtual plane that has the axis of the rotating drum as its normal and cuts the V-shaped bottom of the annular groove.

The fishing net storage assistance system according to the present invention provides a fishing net storage assistance system for retrieving a fishing net from the sea and storing it on a net stand on the deck, comprising: a net hauling machine positioned at the stern of the deck for retrieving the fishing net from the sea; a net handling device for further lifting the fishing net retrieved by the net hauling machine above a net stand set on the deck, changing its direction, and lowering it; a float handling device for guiding the float end of the fishing net descending from the net handling device to the float area of the net stand; a sinker handling device for guiding the sinker end of the fishing net descending from the net handling device to the sinker area of the net stand; and a net handling device for assisting in the deployment of the net body when positioning the net body of the fishing net descending from the net handling device to the net body area of the net stand. As such, it is possible to provide a fishing net storage assistance system that can reduce labor in the first net retrieval process.
Furthermore, according to the net hauling machine of the present invention, a net hauling machine positioned at the stern of the deck and used to pull fishing nets out of the sea comprises a rotating drum having a substantially V-shaped annular groove on its circumferential surface and a substantially horizontal axis for pulling the fishing net onto the ship while sliding it in contact with the drum, and a pair of guide rollers having a substantially vertical axis provided upstream of the rotating drum to converge the fishing net, which has been cast out in an expansive manner toward the sea, to a width that can be wound up. The pair of guide rollers consist of a sliding roller that guides the float side of the fishing net toward the rotating drum and a guide roller that guides the sinker side, and the diameter of the lower half of the guide roller is widened to a position where it substantially contacts a virtual plane that is normal to the axis of the rotating drum and cuts the V-shaped bottom of the annular groove, thereby providing a net hauling machine that can reduce labor in the first net hauling process.

This is a plan view showing a fishing vessel equipped with the fishing net storage support system according to this embodiment. This is a plan view showing a fishing vessel equipped with the fishing net storage support system according to this embodiment. This is an explanatory diagram showing the configuration of the aft deck as seen from the starboard side. This is an explanatory diagram showing the configuration of the aft deck when viewed from the bow towards the stern. This is an explanatory diagram showing the configuration of a net hauling machine. This is an explanatory diagram showing the configuration of the sinker processing device. This is an explanatory diagram showing the configuration of the sinker processing device. This is an explanatory diagram showing the configuration of the roller section. This is an explanatory diagram showing the configuration of the network processing device. This is an explanatory diagram showing the configuration of the network processing device. This is an explanatory diagram showing the configuration of the functional parts. This is an explanatory diagram showing the configuration of the fishing net winding section on the side of the ship. This is an explanatory diagram showing the configuration of the fishing net winding section on the side of the ship. This is an explanatory diagram showing the configuration of a modified net handling machine. This is an explanatory diagram showing the configuration of the drive circuit section of the net handling machine. This is the flow chart for the switching control process.

The fishing net storage assistance system according to the present invention will be described below with reference to the drawings. Figure 1 is a plan view showing the configuration of a fishing vessel 10 equipped with the fishing net storage assistance system S according to this embodiment. In the following description, the right side of the drawing of the fishing vessel 10 shown in Figure 1(a) will be referred to as the bow side, the left side as the stern side, the area above the centerline P1 as the port side, and the area below as the starboard side. Also, the upper and lower parts of the fishing vessel 10 in the height direction will be referred to as "up" and "down," respectively.

As shown in Figure 1(a), various fishing equipment is fitted out on the deck 11 of the fishing vessel 10. In particular, a stern-side fishing net winding unit 12 is located around the net platform 15 in the area closer to the stern than the center of the hull, and a side-side fishing net winding unit 13 is located on the starboard side, extending from the stern to the bow.

Figure 1(b) is an enlarged view of the area near the stern where the stern-side fishing net winding unit 12 is located. As shown in Figure 1(b), the stern-side fishing net winding unit 12 is constructed by arranging a net hoisting machine 16, a net handling device 17, a float handling device 18, a sinker handling device 19, and a net handling device 20 around the net platform 15.

Furthermore, as shown in Figure 2, the net platform 15 defines a float region 15a along the port side where the floats of the hoisted fishing net are placed, and a sinker region 15b along the starboard side where the sinkers are placed.

Furthermore, the area between the float region 15a and the sinker region 15b is designated as the net region 15c, where the net body of the fishing net is located, and the aforementioned sinker processing device 19 is positioned at the boundary between the net region 15c and the sinker region 15b.

To briefly explain the fishing net retrieval process with reference to the diagram, in the first net hauling process described above, as shown in Figure 3, the fishing net M deployed in the sea is pulled up by the net hauling machine 16 located at the stern (starboard stern in this embodiment), and then the net handling device 17 further lifts it to a position above the net platform 15.

The retrieved fishing net M is redirected via the net handling machine 21 located at the tip of the net handling device 17, and then lowered downwards.

At this time, as shown in Figure 4, the fishing net M is unfolded from its converged state. The float portion Ma is guided to the float region 15a by the float processing device 18, the sinker portion Mb is guided to the sinker region 15b by the sinker processing device 19, and the main net portion Mc is unfolded in the direction of the ship by the net processing device 20, landing and being positioned and stored in the main net region 15c.

Then, once the majority of the fishing net M has been recovered from the main boat, the side-mounted net winding unit 13 shown in Figure 1(a) is used to prepare the fishing net M for loading fish, and the fish catcher recovers the net and loads the fish (second net hauling process).

Next, the configuration of each device constituting the stern-side fishing net winding section 12 will be explained. Figure 5 is an explanatory diagram showing the configuration of the net hauling machine 16. Figure 5(a) is an explanatory diagram showing the net hauling machine 16 as viewed from viewpoint Q1 in Figure 2, and Figure 5(b) is an explanatory diagram showing the net hauling machine 16 as viewed from viewpoint Q2.

As shown in Figure 5, the net hauling machine 16 consists of a base section 23 and a net hauling body section 24. The net hauling body section 24 is constructed by positioning a rotating drum 26 between two side plates 25, 25, and is capable of hauling the fishing net M from the sea using power from a hydraulic motor 27.

Furthermore, the rotating drum 26 has an annular V-shaped groove (annular groove 29) formed therein, as shown in Figure 5(b).

Furthermore, guide roller sections 28 are provided near the seaward opening ends of the two side plates 25, 25 that constitute the main body of the net-lifting unit 24. These guide roller sections are positioned at a slight angle towards the sea surface and extend approximately vertically, thereby converging the fishing net M, which is deployed in an expanded manner, to a width that can be wound up by the rotating drum 26.

Furthermore, the guide roller section 28 consists of a sliding roller 30 that guides the float direction Ma and a guide roller 31 that guides the sinker direction Mb.

In particular, the guide roller 31 has a narrow diameter section 31a in its upper half and a wide diameter section 31b in its lower half. The diameter of this wide diameter section 31b is widened to the extent that it contacts the virtual plane P2 that cuts the V-shaped bottom of the annular groove 29.

Furthermore, with a net-hauling machine 16 having this configuration, the sinker portion Mb of the hauled-up fishing net M can be firmly guided to the bottom of the V-shaped groove of the annular groove 29, thereby preventing the fishing net M from twisting.

Furthermore, since the upper half of the guide roller 31 is a narrow-diameter section 31a, even when a larger float is placed in the fishing net M, it can be lifted without hindrance through the wide opening between the sliding roller 30 and the narrow-diameter section 31a.

As shown in Figure 3, the net handling device 17 consists of a crane device 17a and a net handling machine 21. The fishing net M, lifted by the net hoisting machine 16, is further raised to a position above the net platform 15, and then its direction is changed to lower it, sending the fishing net M towards the net platform 15, thereby facilitating the placement and storage of the fishing net M.

As shown in Figures 1(b) and 4, the float processing device 18 consists of a travel base 18a, an arm section 18b, and a drum section 18c. Note that the float processing device 18 is omitted from the description in Figure 3.

The travel base 18a is the part for moving the float processing device 18 along the rail section 33, which is arranged at the port side end of the net platform 15 to extend in the bow-to-stern direction. The arm section 18b is a support section for positioning the drum section 18c in the desired location.

Furthermore, the drum section 18c is the part that wraps around the float section Ma of the fishing net M and lowers it into the float area 15a. It works in cooperation with the travel base 18a and the arm section 18b to adjust the lowering position to the desired location.

The sinker processing device 19 is a device for guiding the sinker portion Mb of the fishing net M descending from the net handling device 17 to the sinker region 15b of the net platform 15. As shown in Figures 1 and 2 in plan view and Figure 4 in side view, it is installed as a partition wall at the boundary between the sinker region 15b and the main net region 15c.

As shown in Figures 6(a) and 6(b), the sinker processing device 19 consists of a device housing 35 and an internal mechanism 36.

The device housing 35 forms the external appearance of the sinker processing device 19, and the stern-side 1/3 to 1/4 of its longitudinal length is sloped downwards towards the stern. Furthermore, the sinker processing device 19 is hollow inside to accommodate the internal mechanism 36, and a roughly rectangular opening 35a is provided on the surface facing the sinker area 15b in the forward-side 2/3 to 3/4 of its longitudinal length.

As shown in Figure 6(b), the internal mechanism 36 comprises a rail 37, a moving body 38, and a drive mechanism 39.

The rail 37 is arranged inside the device housing 35 along the longitudinal direction of the device housing 35, and defines the range of movement of the movable body 38.

The movable body 38 is a component for guiding the sinker portion Mb of the fishing net M to the sinker region 15b. It is configured to be guided to a desired position in the sinker region 15b by moving along the rail 37.

The drive mechanism 39 is the part that moves the movable body 38 along the rail 37.

Here, the configuration of the moving body 38 will be explained in detail with reference to Figures 7 and 8. Figure 7 is an explanatory diagram showing the cross-sectional structure of the sinker region 15b when viewed from the bow towards the stern.

As shown in Figure 7, the movable body 38 is composed of a movable base 40, an arm portion 41, and a roller portion 42.

The movable base 40 is a base for moving the movable body 38 along the rail 37.

The arm portion 41 is the part that moves the roller portion 42 together with the movable base portion 40. The arm portion 41 also plays a role in supporting the roller portion 42 so that it can extend and retract from the device housing portion 35 through the opening 35a, between the stored position (shown by the dashed line in Figure 7) and the operating position (shown by the solid line).

The roller section 42 is a roller-shaped part located at the tip of the arm section 41, and its purpose is to guide the sinker section Mb of the fishing net M into the sinker region 15b.

Furthermore, the roller section 42 has the function of actively guiding the sinker-side end Md of the sinker-side Mb of the fishing net M into the sinker region 15b, while actively guiding the net section Me closer to the float side than the sinker-side end towards the body net region 15c to prevent it from entering the sinker region 15b as much as possible.

Figure 8 is an explanatory diagram showing the relationship between the roller section 42 and the sinker Mb of the fishing net M. As shown in Figure 8, the roller section 42 comprises a main roller 44 and a sub-roller 45. While not limited to this embodiment, the main roller 44 and the sub-roller 45 are arranged coaxially.

The main roller 44 is a roller that rotates in the forward direction indicated by the black arrow near the roller section 42 in Figure 7, and is a roller that actively guides the contacted fishing net M toward the sinker region 15b.

The auxiliary roller 45 is a roller that rotates in the reverse direction indicated by the white arrow. Its purpose is to actively guide the fishing net M, upon contact, over the sinker processing device 19 and towards the main net area 15c, preventing it from entering the sinker area 15b.

In this embodiment, as shown in Figure 8, the sub-roller 45 is configured to have the mesh portion Me in contact with the sub-roller 45 by using it while the sinker-side end Md of the sinker portion Mb is in contact with the main roller 44 which rotates in the forward direction.

This configuration allows for minimizing the amount of netting Me flowing into the sinker region 15b, resulting in a more orderly storage of the fishing net M.

The configuration of the net processing device 20 is shown in Figures 9 to 11. Figure 9 is an explanatory diagram showing the external appearance of the net processing device 20 from a viewpoint looking from the bow towards the stern, Figure 10 is an explanatory diagram showing a plan view of the net processing device 20, and Figure 11 is an explanatory diagram showing the configuration of the functional unit 47 from a viewpoint looking from the starboard side towards the port side.

While net processing devices themselves have existed for some time, gate-type net processing devices, such as those described in Japanese Patent Publication No. 04-183344, can be cumbersome to work because the nets remain suspended on the net platform even when not in use. The net processing device 20 of the fishing net storage assistance system S according to this embodiment is distinctive in that it addresses this issue.

As shown in Figures 9 and 10, the mesh processing device 20 consists of a support section 46 and a functional section 47.

The support section 46 is a part that supports the functional section 47 to position it in the desired location. It comprises a movable base 54, a vertical section 48 extending vertically, and a horizontal section 49 extending horizontally. The vertical section 48 is erected on the movable base 54, and the vertical section 48 and the horizontal section 49 are connected at approximately a right angle.

The movable base 54 is the part that moves the net processing device 20 in the bow-to-stern direction along the rail section 33 located on the port side.

Furthermore, a height adjustment cylinder 51 is provided via a link mechanism 50 on the inner corner side of the connecting portion between the vertical section 48 and the horizontal section 49. By extending and retracting the height adjustment cylinder 51, the vertical position of the functional section 47 can be adjusted while maintaining the horizontal position of the horizontal section 49.

Furthermore, a functional unit 47 is attached to the tip of the horizontal section 49 via a side-direction adjustment cylinder 52, allowing the side-direction position of the functional unit 47 to be adjusted by extending and retracting the side-direction adjustment cylinder 52.

Furthermore, a storage cylinder 53 is provided in the vertical section 48. This storage cylinder 53 is used to change the orientation between a working position, where the horizontal section 49 and functional section 47 are extended perpendicular to the rail section 33 (as shown in Figure 10(a)), and a storage position, where the horizontal section 49 and functional section 47 are extended approximately parallel to the rail section 33 (as shown in Figure 10(b)).

In other words, when the net processing device 20 is not in use, the functional unit 47 does not remain positioned on the net base 15, but is configured to be moved to the side of the ship as needed. With this configuration, even when the net processing device 20 is not in use, it does not get in the way.

Furthermore, this effect stems from the fact that the support section 46 is configured as a so-called cantilever arm, which dramatically improves work efficiency compared to the aforementioned gantry-type mesh processing device.

The functional section 47 consists of a support rod 55, suspension rods 56, 56, and a mesh processing roller 57.

The support rod 55 functions as a pivot shaft for swinging the mesh processing roller 57 via the suspension rods 56, 56, and is connected to and arranged in a direction extending from the horizontal portion 49 of the support portion 46.

The suspension rods 56, 56 are support members for swingably supporting the mesh processing roller 57.

The net processing roller 57 is a roller that contacts the main net portion Mc of the fishing net M to spread the net in the direction of the ship's side. In this embodiment, when the net processing roller 57 is rotated along the downstream direction of the fishing net M, the fishing net M is spread to the left and right. Therefore, spiral friction bodies are formed with a reverse screw shape (reverse helix) on either side of the approximately central part in the longitudinal direction.

Furthermore, as shown in Figure 11, a swing cylinder 58 is interposed between the support rod 55 and the suspension rods 56, 56, allowing for a swinging motion between the hanging position shown by the solid line and the protruding position shown by the dashed line, enabling the lowered net section Mc to be stored in a web-like shape. In Figure 11, reference numeral 59a denotes a drive motor 59a for rotating the net processing roller 57, and 59b denotes a chain 59b for transmitting power from the drive motor 59a to the net processing roller 57.

As described above, the fishing net storage assistance system S according to this embodiment is equipped with the aforementioned stern-side fishing net winding unit 12. Therefore, in the first net hauling process, where the majority of the fishing net is recovered onto the fishing vessel from the main side and the area is gradually narrowed, the work can be carried out efficiently while saving labor.

Next, the side fishing net winding unit 13 shown in Figure 1(a) will be described. As shown in Figure 12, the side fishing net winding unit 13 is equipped with a side roller 60 and a fish tightening roller device 61.

The side roller 60 is a long, rod-shaped (log-shaped) roller positioned along the starboard side, with its axis running from bow to stern. This side roller 60 is used during the second net-hauling process for loading fish and retrieving the fish-catching end of the fishing net M. As shown in Figure 12, the side roller 60 rotates in the winding direction, and the side roller 60 assists in the retrieval of the fishing net M by contacting the fishing net M held by the worker 62 as they pull it onto the ship.

As shown in Figures 12 and 13, the fish-holding roller device 61 consists of an arm portion 63 and a fish-holding roller 64.

The arm portion 63 has its base fixed to the hull and functions as a support for supporting the fish-holding roller 64, located at its tip, so that it can move toward and away from the side roller 60 by two cylinders 65, 65.

The fish-holding roller 64 rotates while being pressed against the rotating surface of the side roller 60, thereby lifting the fishing net M that is held between the side roller 60 and the fish-holding roller 64.

In the second net-hauling process, several workers 62 line up along the side rollers 60 and manually haul in the fishing net M. However, the fishing net storage assistance system S according to this embodiment is equipped with a side-mounted fishing net winding unit 13, which dramatically reduces the labor required by the workers 62 in this second net-hauling process.

[Variation]
As described above, the fishing net storage assistance system S according to this embodiment achieves labor savings in the first net hauling process by including a net hauling machine 16, a net handling device 17, a float processing device 18, a sinker processing device 19, and a net processing device 20.

In particular, the twisting that occurs in the fishing net M during retrieval hinders the smooth organization and storage of the fishing net M on the net stand 15, and conventionally, it was necessary to assign workers to untangle the net.

In this regard, the fishing net storage assistance system S according to this embodiment is equipped with a guide roller section 28 with a distinctive structure on the net hauling machine 16, thereby suppressing the occurrence of twisting and greatly contributing to labor saving.

However, even in a fishing net storage support system S equipped with such a net-lifting machine 16, there was still room for further attempts to suppress twisting.

Therefore, this modified version describes a net handling machine equipped with a twist suppression mechanism and a fishing net storage assistance system equipped with the same net handling machine. Specifically, the fishing net storage assistance system S2 according to the modified version has the same configuration as the fishing net storage assistance system S described above, but differs in that the net handling machine is equipped with a twist suppression mechanism.

Figure 14 is an explanatory diagram showing the net handling machine 70 of the fishing net storage auxiliary system S2 according to a modified example. Figure 14(a) shows the external appearance of the net handling machine 70, and Figure 14(b) shows the internal structure of the net handling machine 70 with a portion cut out.

As shown in Figures 14(a) and 14(b), the net handling machine 70 consists of a shaft support 71, a drum shaft 72, a drum section 73, and a suspension connection section 74.

The shaft support 71 is a support member that functions as a bearing for the drum shaft 72, which is the rotation axis of the drum section 73. The shaft support 71 comprises a left plate section 71L and a right plate section 71R, and the drum shaft 72 is arranged across both of these sections.

Furthermore, the left and right plate portions 71L and 71R of the shaft support 71 are respectively equipped with a hydraulic motor 75L for the left drum and a hydraulic motor 75R for the right drum. This configuration allows either the left drum section 73L or the right drum section 73R of the drum section 73 (described later) to rotate faster than the other.

The drum shaft 72 is the shaft for rotating the drum portion 73 between the gaps in the shaft support 71, that is, between the left plate portion 71L and the right plate portion 71R.

The drum section 73 is rotated by a hydraulic motor mounted on the shaft support 71 and is the part that feeds the swung fishing net M downwards. In particular, the drum section 73 in this modified example comprises a roughly bowl-shaped left drum section 73L and a right drum section 73R, each inserted onto the drum shaft 72 so that they can rotate independently.

Furthermore, as shown in Figure 14(b), internal gears 76 are formed on the inner circumferential surfaces of the arm-shaped edges of the left drum section 73L and the right drum section 73R. These internal gears 76 mesh with drive gears 77, which are located on the drive shafts of the left drum hydraulic motor 75L and the right drum hydraulic motor 75R, respectively. The left drum section 73L and the right drum section 73R can rotate at different rotational speeds, depending on the drive speed of the left drum hydraulic motor 75L and the right drum hydraulic motor 75R, as shown by the white arrows in Figure 14(a).

The suspension connection section 74 is the part that connects to the tip of the crane device 17a to suspend the net handling machine 70. In the front view shown in Figures 14(a) and 14(b), it has a roughly arched shape, with each end connected to the upper part of the left plate section 71L and the right plate section 71R.

Next, the hydraulic circuit that drives the net handling machine 70 will be described. Among the hydraulic circuits that drive hydraulic mechanism components at various locations on the ship, the fishing net storage assistance system S2 according to this modified example includes a net handling machine drive circuit 110 for driving the net handling machine 70. Figure 15 is a hydraulic circuit diagram showing an excerpt of the configuration of the net handling machine drive circuit 110 related to the driving of the net handling machine 70.

As shown in Figure 15, the net handling machine drive circuit 110 comprises a main circuit 111 and a sub-circuit 112.

The main circuit section 111 is a circuit for supplying hydraulic fluid evenly to both the left drum hydraulic motor 75L and the right drum hydraulic motor 75R. The main circuit section 111 also serves to adjust the rotational speed and switch between forward and reverse rotation.

Specifically, the main circuit section 111 comprises a main flow rate adjustment section 115, a counterbalancing section 116, a distribution section 117, and a hydraulic motor section 118.

The main flow rate adjustment unit 115 is responsible for switching the supply and cessation of hydraulic fluid from the pressure line P, and for switching the direction of supply, thereby driving and stopping the hydraulic motor 75L for the left drum and the hydraulic motor 75R for the right drum, and for switching between forward and reverse rotation.

The main flow rate adjustment unit 115 is equipped with a manual switching valve 120. By operating the operating lever 121, it is possible to switch between three states: a parallel communication state in which hydraulic pressure from the first port (which serves as the pressure inlet) is output to the third port; a closed state in which hydraulic pressure from the first port is not output to either port; and a cross-communication state in which hydraulic pressure from the first port is output to the fourth port. The second port is a port for hydraulic pressure return connected to the tank line T. Furthermore, in this modified example, the operating lever 121 is connected to a separate hydraulic system and can be operated remotely.

Furthermore, the manual switching valve 120 allows for adjustment of the oil supply amount by operating the operating lever 121.

Furthermore, the operating lever 121 is equipped with a switching position detection means 121a that can detect whether the switching position of the operating lever 121 is at least in the closed state. This switching position detection means 121a is electrically connected to a control unit (not shown), and whether or not the manual switching valve 120 is in the closed state is referenced by the control unit in the switching control of the flow path switching unit 127, described later.

The counterbalancing unit 116 is a component that suppresses the runaway operation of both hydraulic motors 75L and 75R caused by the fall of the fishing net M, which is being handled by the net handling machine 70, due to gravity.

The distribution section 117 comprises a first port, which is a pressure inlet, and second and third ports, which are outlets. Its purpose is to evenly distribute the hydraulic fluid supplied from the first port to the second and third ports.

The first port of the distribution unit 117 is connected to the third port of the main flow rate adjustment unit 115 via the counterbalancing unit 116. Furthermore, the second port is connected to the first port of the hydraulic motor unit 118, and the third port is connected to the second port of the hydraulic motor unit 118.

The hydraulic motor unit 118 consists of a hydraulic motor 75L for the left drum, located on the left side plate 71L of the net handling machine 70, and a hydraulic motor 75R for the right drum, located on the right side plate 71R.

The hydraulic motor unit 118 includes a first port connected to the forward rotation port 80a of the left drum hydraulic motor 75L, a second port connected to the forward rotation port 80a of the right drum hydraulic motor 75R, and a third port connected to the reverse rotation port 80b of both the left drum hydraulic motor 75L and the right drum hydraulic motor 75R. The third port is also connected to the fourth port of the main flow rate adjustment unit 115 via the counterbalance unit 116.

When the manual switching valve 120 of the main flow rate adjustment unit 115 is in parallel communication, hydraulic fluid is supplied to the hydraulic motor unit 118 from the first and second ports. Therefore, hydraulic fluid is supplied from the forward rotation port 80a of the left drum hydraulic motor 75L and the right drum hydraulic motor 75R, causing both hydraulic motors 75L and 75R to rotate in the forward direction. Here, "forward rotation" refers to the winding rotation direction that lowers the fishing net M, which has been wrapped around the net handling machine 70, onto the net stand.

Furthermore, the hydraulic fluid discharged from both hydraulic motors 75L and 75R is discharged from the third port and returns to the tank line T via the counterbalancing unit 116 and the main flow rate adjustment unit 115.

On the other hand, when the manual switching valve 120 of the main flow rate adjustment unit 115 is in cross-communication state, hydraulic fluid is supplied to the hydraulic motor unit 118 from the third port. Therefore, hydraulic fluid is supplied from the reverse rotation port 80b of the left drum hydraulic motor 75L and the right drum hydraulic motor 75R, causing both hydraulic motors 75L and 75R to rotate in the reverse direction of the discharge.

Furthermore, the hydraulic fluid discharged from the forward rotation ports 80a of both hydraulic motors 75L and 75R is discharged from the first and second ports of the hydraulic motor unit 118 and returned to the tank line T via the distribution unit 117, counterbalancing unit 116, and main flow rate adjustment unit 115.

The sub-circuit section 112 is a component that, as needed, supplies a predetermined amount of additional hydraulic fluid to either the left drum hydraulic motor 75L or the right drum hydraulic motor 75R, which have been equally distributed and supplied by the distribution section 117 of the main circuit section 111, thereby increasing the rotational speed of the hydraulic motor on the side to which the hydraulic fluid has been added.

Specifically, the sub-circuit section 112 includes a pressure reducing valve section 125, a sub-flow rate adjustment section 126, and a flow path switching section 127.

The pressure reducing valve section 125 is a component that reduces the hydraulic pressure of the hydraulic fluid supplied from the pressure line P to an appropriate hydraulic pressure that matches the additional flow rate. The pressure reducing valve section 125 has a first port which serves as a pressure inlet and a second port which serves as an outlet for the reduced-pressure hydraulic fluid. The first port is connected to the pressure line P, while the second port is connected to the first port of the auxiliary flow rate adjustment section 126.

The auxiliary flow rate adjustment unit 126 is a component for adjusting the amount of additional hydraulic fluid supplied, that is, for adjusting the degree of speed increase of the hydraulic motor. The auxiliary flow rate adjustment unit 126 has a first port, which is the hydraulic fluid inlet, and a second port, which is the hydraulic fluid outlet. The first port is connected to the second port of the pressure reducing valve unit 125, allowing it to receive hydraulic fluid that has been depressurized by the pressure reducing valve unit 125. The second port is connected to the flow path switching unit 127, allowing the flow-adjusted hydraulic fluid to be supplied to the flow path switching unit 127.

The flow path switching unit 127 is a switching unit that determines whether to add additional hydraulic fluid to the left drum hydraulic motor 75L or the right drum hydraulic motor 75R, that is, which hydraulic motor to increase the speed of, or to set the system so that neither hydraulic motor increases speed.

The flow path switching unit 127 includes a first port, which serves as the inlet for the hydraulic fluid whose flow rate has been adjusted by the sub-flow rate adjustment unit 126; a third port, which is an additional hydraulic fluid outlet for speeding up the left drum hydraulic motor 75L; and a fourth port, which is an additional hydraulic fluid outlet for speeding up the right drum hydraulic motor 75R. The second port is a drain port and is connected to the drain line Dr.

The third port is connected to the middle of the hydraulic piping connecting the second port of the distribution unit 117 and the first port of the hydraulic motor unit 118, forming a junction 129a for the left drum. It supplies additional hydraulic fluid in addition to the hydraulic fluid discharged from the second port of the distribution unit 117, enabling the left drum hydraulic motor 75L to increase speed during forward rotation.

Similarly, the fourth port is connected to the middle of the hydraulic piping connecting the third port of the distribution unit 117 and the second port of the hydraulic motor unit 118, forming a junction 129b for the right drum. This junction supplies additional hydraulic fluid in addition to the hydraulic fluid discharged from the third port of the distribution unit 117, enabling the right drum hydraulic motor 75R to increase speed during forward rotation.

Furthermore, the flow path switching section 127 is equipped with a switching valve 127a, which can be switched between three states: a parallel communication state in which hydraulic pressure from the first port is output to the third port; a closed state in which hydraulic pressure from the first port is not output to either port; and a cross-communication state in which hydraulic pressure from the first port is output to the fourth port.

Furthermore, this switching valve 127a employs a solenoid valve and is electrically connected to a control unit (not shown), allowing the switching to be controlled by the control unit. For example, in the fishing net storage assistance system S2 according to this modified example, the switching of the switching valve 127a is achieved by the operator operating a predetermined control unit to input to the control unit a speed-up stop instruction (closing the switching valve 127a to prevent speed-up of either hydraulic motor), a left motor speed-up instruction (connecting the switching valve 127a in parallel to increase the speed of the left drum hydraulic motor 75L), or a right motor speed-up instruction (connecting the switching valve 127a in cross-connection to increase the speed of the right drum hydraulic motor 75R).

Here, the control process for the switching valve 127a will be explained with reference to Figure 16. Figure 16 is a flowchart showing the switching control process for the switching valve 127a in the control unit. In the fishing net storage assistance system S2 according to this modified example, various processes are implemented in the control unit, such as the main process for coordinating various processes and the processes when operators operate various pieces of equipment. However, here we will explain the switching control process for the switching valve 127a, which is executed as one of the subroutines, and the explanation of other processes will be omitted.

In the switching control process, the control unit refers to the input from the operator's control unit and determines whether or not a speed increase/stop instruction has been received (step S11). If it is determined that a speed increase/stop instruction has been received (step S11: Yes), the control unit executes the process of switching the switching valve 127a to the closed state (step S12), and returns the process to the address before the branch, such as the main routine. On the other hand, if it is determined that there is no speed increase instruction (step S11: No), the control unit moves the process to step S13.

In step S13, the control unit refers to the switching position detection means 121a and determines whether the switching position of the operating lever 121 is in the closed position, that is, whether the manual switching valve 120 is in the closed state. If it is determined that the manual switching valve 120 is in the closed state (step S13: Yes), the control unit returns the process to the address before the branch. On the other hand, if it is determined that the manual switching valve 120 is not in the closed state (step S13: No), the control unit moves the process to step S14.

In step S14, the control unit refers to the input from the operator's control unit and determines whether or not a left motor speed increase instruction was received. If it determines that a left motor speed increase instruction was received (step S14: Yes), the control unit executes the process of switching the switching valve 127a to the parallel communication state (step S15) and returns processing to the address before the branching. On the other hand, if it determines that there was no left motor speed increase instruction (step S14: No), the control unit moves processing to step S16.

In step S16, the control unit refers to the operator's input from the control unit and determines whether or not a right motor speed increase instruction has been received. If it determines that a right motor speed increase instruction has been received (step S16: Yes), the control unit executes the process of switching the switching valve 127a to the cross-communication state (step S17) and returns the process to the address before the branching. On the other hand, if it determines that there was no right motor speed increase instruction (step S16: No), the control unit returns the process to the address before the branching.

Next, the operation of the net handling machine 70 and the net handling machine drive circuit 110, configured in this way, will be explained with reference to Figure 15.

When the operator sets the manual switching valve 120 of the main circuit unit 111 to parallel connection, both hydraulic motors 75L and 75R rotate in the forward direction when closed, stop when closed, and reverse direction when cross-connected.

Furthermore, the manual switching valve 120 allows for adjustment of the discharge oil volume by operating the operating lever 121, enabling the rotational speed of both hydraulic motors 75L and 75R to be adjusted to the desired speed.

Furthermore, when no additional hydraulic fluid is supplied from the sub-circuit section 112, i.e., when the flow path switching section 127 (switching valve 127a) is in the closed state, the distribution section 117 of the main circuit section 111 supplies hydraulic fluid equally to both hydraulic motors 75L and 75R. Therefore, both drum sections 73L and 73R can rotate integrally at approximately the same speed.

Here, if twisting occurs in the fishing net M, an attempt is made to eliminate the twist by creating a speed difference between the two drum sections 73L and 73R.

In other words, while adjusting the speed difference using the sub-flow adjustment unit 126, if you want to increase the speed of the drum section 73L, setting the flow path switching unit 127 to the parallel communication state will supply additional hydraulic fluid to the left drum hydraulic motor 75L, thus increasing the rotational speed of the left drum hydraulic motor 75L. Therefore, in the drum section 73 of the net handling machine 70, the left drum section 73L can be rotated faster than the right drum section 73R.

Furthermore, if you want to increase the speed of the right drum section 73R, setting the flow path switching unit 127 to the cross-communication state will supply additional hydraulic fluid to the right drum hydraulic motor 75R, thereby increasing the rotational speed of the right drum hydraulic motor 75R. Therefore, in the drum section 73 of the net handling machine 70, the right drum section 73R can be rotated faster than the left drum section 73L.

In this way, by utilizing the movement associated with the supply of hydraulic fluid from the speed-increasing hydraulic fluid confluence section 129, such as the left drum confluence section 129a and the right drum confluence section 129b, the operator can eliminate twisting in the fishing net M and store the fishing net M while maintaining a speed difference that prevents twisting, thereby achieving further labor savings.

Furthermore, in the fishing net storage assistance system S2, the switching position detection means 121a and the switching valve 127a are electrically connected to the control unit, and the control unit performs the switching control processing described above. Therefore, even when hydraulic fluid is not being supplied to each hydraulic motor in the main circuit unit 111, hydraulic fluid is supplied from the sub-circuit unit 112, preventing the left drum split 73L or the right drum split 73R from rotating.

As described above, the fishing net storage assistance system S according to this embodiment provides a fishing net storage assistance system for retrieving fishing nets from the sea and storing them neatly on a net stand on the deck. This system includes: a net hauling machine positioned at the stern of the deck for retrieving the fishing nets from the sea; a net handling device for further lifting the nets retrieved by the hauling machine above the net stand set on the deck, changing their direction, and lowering them; a float handling device for guiding the float portion of the fishing net descending from the net handling device into the float area of the net stand; a sinker handling device for guiding the sinker portion of the fishing net descending from the net handling device into the sinker area of the net stand; and a net handling device for assisting in the deployment of the net portion when positioning the net portion of the fishing net descending from the net handling device into the net area of the net stand. Therefore, a fishing net storage assistance system that can reduce labor in the first net retrieval process is provided.

Finally, the descriptions of the embodiments described above are merely examples of the present invention, and the present invention is not limited to the embodiments described above. Therefore, it goes without saying that various modifications are possible depending on the design, etc., even in embodiments other than those described above, as long as they do not depart from the technical spirit of the present invention.

In this modified example, the fishing net storage assistance system S2 includes a control unit to perform switching control processing. However, the system is not limited to this configuration, and the fishing net storage assistance system S may also include a control unit to perform various other processes.

Furthermore, in this case, the configuration of the control unit is not particularly limited. For example, it can be built using a PCL (Programmable Logic Controller), or it can be built using a computer equipped with a predetermined CPU, ROM, RAM, etc., and various processes can be executed as predetermined software.

11 Deck 12 Stern fishing net winding section 13 Side fishing net winding section 15 Net platform 15a Float area 15b Sinker area 15c Main net area 16 Net hauling machine 17 Net handling device 17a Crane device 18 Float processing device 19 Sinker processing device 20 Net processing device 21 Net handling machine 28 Guide roller section 29 Annular groove 30 Sliding roller 31 Guide roller 31a Narrow diameter section 31b Wide diameter section 35 Device housing section 35a Opening 44 Main roller 45 Sub-roller 53 Storage cylinder 57 Net processing roller 58 Oscillating cylinder 60 Side roller 61 Fish tightening roller device 64 Fish tightening roller M Fishing net Ma Float side Mb Sinker side Mc Body net section Md, sinker end Me, net section P2, virtual plane S, fishing net storage support system

Claims (8)

In a fishing net storage assistance system for retrieving fishing nets from the sea and storing them neatly on a net stand on the deck,
Located at the stern of the deck, it houses a net hauling machine for pulling fishing nets out of the sea,
The net handling device, which lifts the fishing nets that have been pulled up by the net hauling machine, further raises them above the net platform set up on the deck, changes their direction, and lowers them down,
A float processing device that guides the float side of the fishing net descending from the net handling device into the float area of the net platform,
A sinker processing device that guides the sinker portion of the fishing net descending from the net handling device into the sinker area of the net platform,
The system includes a net handling device that assists in unfolding the net portion of the fishing net as it descends from the net handling device and is positioned within the net area of the net platform .
The aforementioned net hauling machine is
A rotating drum with a roughly V-shaped annular groove on its circumferential surface and a roughly horizontal axis for pulling fishing nets onto the ship while maintaining contact with them,
It comprises a pair of guide rollers having an axis in a substantially vertical direction, located upstream of the rotating drum, in order to converge the fishing net, which has been deployed in an expansive manner toward the sea, to a width that can be wound up,
The fishing net storage assistance system is characterized in that the pair of guide rollers consists of a sliding roller that guides the float side of the fishing net to the rotating drum and a guide roller that guides the sinker side, and the diameter of the lower half of the guide roller is widened to a position where it substantially contacts a virtual plane that is normal to the axis of the rotating drum and cuts the V-shaped bottom of the annular groove. The sinker area is a region set adjacent to the main net area on either the left or right side of the net platform, and the sinker processing device is provided in a partition-like manner at the boundary between the sinker area and the main net area, as described in claim 1. The sinker processing device includes a sinker guide roller section that is movable along the partition-shaped device housing section,
The sinker guide roller section has a main roller that guides the sinker-side end of the sinker and a secondary roller that guides the net section closer to the float side than the sinker-side end.
The fishing net storage assistance system according to claim 2, characterized in that the main roller is configured to rotate in the forward direction in which the sinker-side end is guided toward the sinker region, while the sub-roller is configured to rotate in the reverse direction in which the net portion is guided toward the body net region. The aforementioned mesh processing apparatus is
A mesh processing roller comprising a rotatable rod-shaped body with friction surfaces on one side and the other side having opposite threads,
The net processing device includes a support that supports the net processing roller so that it contacts the net body portion of the fishing net that is suspended from the net processing device,
The fishing net storage assistance system according to claim 1, characterized in that the support portion is a cantilever arm having its base on the side of the hull on the float area side. The fishing net storage assistance system according to claim 1, characterized by being equipped with a side-mounted fishing net winding device for tightening the fishing net in the manner of loading fish. The aforementioned side fishing net winding device is,
A side roller is positioned along one of the sides of the hull,
The fishing net storage assistance system according to claim 5 , further comprising a fish-binding roller that rotates in contact with the rotating surface of the side roller. The aforementioned net handling device involves hoisting the fishing net onto the drum of a net handling machine installed at the tip of a crane device and then lowering it down.
The fishing net storage assistance system according to claim 1, characterized in that the drum section is composed of a left drum section and a right drum section, and each drum section is capable of rotating at different speeds. In a net hauling machine located at the stern of the deck, used to pull fishing nets out of the sea,
A rotating drum with a roughly V-shaped annular groove on its circumferential surface and a roughly horizontal axis for pulling fishing nets onto the ship while maintaining contact with them,
It comprises a pair of guide rollers having an axis in a substantially vertical direction, located upstream of the rotating drum, in order to converge the fishing net, which has been deployed in an expansive manner toward the sea, to a width that can be wound up,
The aforementioned pair of guide rollers consist of a sliding roller that guides the float side of the fishing net to the rotating drum and a guide roller that guides the sinker side, and the diameter of the lower half of the guide roller is widened to a position where it substantially contacts a virtual plane that is normal to the axis of the rotating drum and cuts through the V-shaped bottom of the annular groove.