JP2619127B2 - Structure of suspension stand for towing cable - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a structure of a suspension stand installed at the stern of a ship for suspending a towing cable to which an underwater vehicle such as a sonar for ocean observation is attached. It is.

[Conventional technology]

Heretofore, various types of suspension stands for this type of towing cable have been proposed, and the most frequently used suspension stand is a combination of a vertical roller and a horizontal roller. .

FIG. 4 is a side view showing a towing state of a ship provided with a conventional suspension base having such a structure.

In the figure, 1 is a ship, 2 is a winch for cable feeding and recovery installed on the ship 1, and 3 is this winch 2
A suspension stand 4 is provided at the stern of the ship 1 at a predetermined interval, and a reference numeral 4 denotes a towing cable which also serves as a signal line having a surface coating of high-density polyethylene or the like, and 5 denotes an end of the towing cable 4. The undercarriage 5 is an underwater vehicle such as a sonar for ocean observation, and the underwater vehicle 5 is almost horizontally held in the water by the underwater cable 4 extended from the winch 2 and suspended underwater by the suspension stand 3. It is towed by navigation to collect marine information.

FIG. 5 is a side view showing the structure of the winch 2 and the conventional suspension stand 3, and FIG. 6 is a plan view thereof.

As shown in this figure, the winch 2 includes a rotatable drum 2a, and a pair of left and right translator rollers 2b and 2c arranged on the suspension base 3 side of the drum 2a. , 2c are rotatable and movable in the axial direction of the drum 2a, and the towing cable 4 is passed between the translatory rollers 2b, 2c.

On the other hand, the suspension base 3 has a pair of left and right vertical rollers 3a, 3b whose surfaces are formed of polyurethane or the like, and a pair of upper and lower horizontal rollers 3c, 3d also whose surfaces are formed of polyurethane or the like.
And so that the vertical rollers 3a and 3b are on the winch 2 side.

Here, the rollers 3a to 3d are rotatably supported by a suspension frame (not shown) fixed to the stern of the marine vessel 1. The distance between the opposing surfaces of the vertical rollers 3a and 3b is determined by horizontal rollers 3c and 3d.
And the distance between the opposing surfaces of the horizontal rollers 3c and 3d is within the axial length of the vertical rollers 3a and 3b.

Therefore, by passing the towing cable 4 between the vertical rollers 3a, 3b and between the horizontal rollers 3c, 3d, the horizontal machine rollers 2b, 2c of the winch 2 move to the position of the end of the drum 2a, or Even if 1 is shaken, the towing cable 4 does not come into contact with anything other than the vertical rollers 3a, 3b or the horizontal rollers 3c, 3d.

In this configuration, when the towing cable 4 is extended or retrieved, when the drum 2a is rotated, the transversely moving machine rollers 2b and 2c move in the axial direction of the drum 2a and guide the same, thereby moving the towing cable 4 from the drum 2a. Noei Cable 4
Are uniformly fed or wound in the axial direction.

At this time, when the horizontal traveling machine rollers 2b, 2c, the vertical rollers 3a, 3b, and the horizontal rollers 3c, 3d come into contact with the towing cable 4, they rotate by the unwinding or winding force, so that the towing cable 4 is smoothly unwound. You can make money.

[Problems to be solved by the invention]

However, in the conventional suspension base having the above-described structure, as shown in FIG. 5, when the towing cable 4 is in contact with the lower horizontal roller 3d, the vertical rollers 3a, 3b
And the angle α formed by the towing cable 4 on the winch 2 side
Since the inclination angle of the vertical rollers 3a and 3b is set to 90 degrees, there is a problem described below.

That is, during the towing of the covered vehicle 5 by the ship 1, for example, as shown in FIG.
c is located at one end of the drum 2a, the transverse machine roller 2b and the suspension
When the towing cable 4 is in contact with the vertical roller 3b at an angle θ and the vessel 1 pitches (moves vertically) due to marine conditions, the towing cable 4 is set to the fifth position. As shown by the two-dot chain line in the figure, there is a case where a vertical swing phenomenon occurs in which the roller relatively moves to a position in contact with the upper horizontal roller 3c, and further reciprocates the horizontal rollers 3c and 3d by repeating the pitching movement.

In this case, the longitudinal roller 3b does not rotate due to the relationship of the angle α, so that the towing cable 4 rubs vertically with the longitudinal roller 3b at the same place, whereby the between the towing cable 4 and the longitudinal roller 3b. A large frictional force will be generated.

The same applies to the relationship between the translator roller 2c and the longitudinal roller 3a. Therefore, the coating on the surface of the towing cable 4 is damaged by this large frictional force, and in the worst case, the towing cable 4 is broken. There was a problem.

The present invention has been made to solve such a problem, and it is an object of the present invention to minimize the frictional force with a vertical roller caused by a vertical run-out phenomenon of a towing cable to prevent damage to a coating on a towing cable surface. It is an object of the present invention to provide a structure of a suspension stand for a towing cable capable of performing the following.

[Means for solving the problem]

In order to achieve this object, the present invention comprises a pair of left and right rotatable vertical rollers, and a pair of upper and lower rotatable horizontal rollers arranged close to the vertical rollers, and is provided with a covered hull. For a winch provided with a drum installed on a ship to carry out and retrieve a towing cable, and a translator roller that moves parallel to the drum and guides the delivery and retrieval of the towing cable. In the structure of a towing cable suspension stand, a pair of vertical rollers are installed at a predetermined distance so as to be located on the winch side from the pair of horizontal rollers, and are suspended through the towing cable between the vertical rollers and the horizontal rollers. The vertical rollers are inclined such that the angle formed by the towing cable between the translator roller and the vertical roller and the vertical roller on the ship side is 50 degrees or less.

(Operation)

The present invention having the above-described structure, when the towing cable is at an end of the drum and the towing cable is in contact with the vertical roller at an angle, and when the towing cable has a vertical run-out phenomenon, Due to the inclination of the roller, the point of contact of the towing cable with the vertical roller shifts, thereby generating a force to rotate the vertical roller, and this force rotates the vertical roller, so that the frictional force between the towing cable and the vertical roller is minimized. Can be kept to a minimum.

Therefore, according to this, the frictional force with the vertical roller caused by the vertical run-out phenomenon of the towing cable can be minimized, so that the coating on the surface of the towing cable is damaged by the frictional force,
Breakage of the towing cable can be prevented.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the structure of a suspension cable for a towing cable according to the present invention, and FIG. 2 is a plan view thereof.

In the figure, reference numeral 1 denotes a ship, 2 denotes a winch for pulling out and recovering a cable comprising a drum 2a and transversely moving machine rollers 2b and 2c installed on the ship 1, and 4 denotes a conventional sailing cable serving also as a signal line. Since they are the same components as those described above, they are denoted by the same reference numerals and description thereof is omitted.

Although not shown in the figure, an underwater vehicle such as a sonar for ocean observation is attached to the end of the underwater cable 4 in the same manner as in the prior art.

Reference numeral 6 denotes a suspension stand according to the present embodiment, which is installed at a stern of the boat 1 at a predetermined interval from the winch 2.
Are vertical rollers 3a, 3b and horizontal rollers 3c,
The vertical rollers 6a and 6b corresponding to 3d and the horizontal rollers 6c and 6d are combined so that the vertical rollers 6a and 6b are on the winch 2 side.

Here, the rollers 6a to 6d are rotatably supported by a suspension frame (not shown) fixed to the stern of the boat 1, and the distance between the opposing surfaces of the vertical rollers 6a and 6b is a horizontal roller.
Although it is the same as before that the shaft length is set within the axial lengths of 6c and 6d, and the interval between the facing surfaces of the horizontal rollers 6c and 6d is set within the axial length of the vertical rollers 6a and 6b, in the present embodiment, As shown in FIG. 1, when the towing cable 4 is in contact with the lower horizontal roller 6d, the angle α formed between the vertical rollers 6a, 6b and the tow cable 2 on the winch 2 side on the ship upper surface side is 50 degrees or less (for example, 45
(Degree), the inclination angles of the vertical rollers 6a and 6b are set.

That is, in the conventional suspension table 3, the angle α formed between the longitudinal rollers 3a and 3b and the towing cable 4 is set to “α ゜ 90 °”, whereas the suspension table 6 in the present embodiment includes the vertical rollers 6a, The angle α formed by the cable 6b and the towing cable 4 is set to “α <50 °”.

And, between the vertical rollers 6a and 6b of the
By passing the towing cable 4 in series between c and 6d, respectively, even if the translating machine rollers 2b and 2c of the winch 2 move to the position of the end of the drum 2a or the ship 1 shakes, The towing cable 4 is a vertical roller 6a, 6b or a horizontal roller 6
No contact other than c and 6d.

FIG. 3 is an enlarged side view of a main part of the above-described structure, and FIG.
The operation will be described with reference to FIG. 2 and FIG.

First, during the towing of the covered vehicle by the ship 1, for example, as shown in FIG. 2, the translating machine rollers 2a, 2b of the winch 2 are at one end of the drum 2a, and the translating machine rollers 2b and the vertical rollers of the suspension stand 6 are provided. From the relationship with the position of the towing cable 4b, when the towing cable 4 is in contact with the longitudinal roller 6b at an angle θ and the vessel 1 pitches (push) due to sea conditions or the like, the towing cable 4 has two points in FIG. As shown by the dashed line, there is a case where a vertical swing phenomenon is caused in which the movable member relatively moves to a position in contact with the upper horizontal roller 6d and further reciprocates between the horizontal rollers 6c and 6d due to repetition of the pitching movement.

In this case, in this embodiment, the towing cable 4 and the vertical roller
The contact point 6b changes from point A to point B or from point B to point A as shown in FIG.

Therefore, when the contact point changes from point A to point B, point A on the towing cable 4 moves to point A ', and the point of contact with the longitudinal roller 6b becomes A' in the longitudinal direction of the towing cable 4.
In this movement, the tension of the towing cable 4 generates a pressing force on the vertical roller 6b in a direction perpendicular to its central axis, that is, in the direction of arrow X, thereby rotating the vertical roller 6b. .

Of course, when the contact point changes from point B to point A, a pressing force is applied to the vertical roller 6b in a direction opposite to the direction of the arrow X, whereby the vertical roller 6b rotates in the opposite direction.

The generation of these pressing forces varies depending on the tension applied to the towing cable 4, the mutual friction coefficient of the surface coating material of the navigation cable 4 which is the surface material of the longitudinal roller 6b, and the like.
As the angle α becomes smaller, the vertical roller 6a becomes easier to rotate.

In a partial experiment, when the surface material of the longitudinal roller 6b and the material of the surface coating of the towing cable 4 have large friction coefficients,
When the angle α was 50 degrees or less, the vertical roller 6b rotated smoothly.

As described above, in this embodiment, when the towing cable 4 oscillates vertically, the longitudinal roller 6a or 6b in contact with the towing cable 4 rotates accordingly, so that the frictional force between the towing cable 4 and the longitudinal roller 6a or 6b. Is minimized.

〔The invention's effect〕

As described above, the present invention relates to a structure of a suspension cable for a towing cable suspended between a longitudinal roller and a horizontal roller through a towing cable. The angle between the roller and
The configuration is such that the vertical roller is inclined so that it is 50 degrees or less,
When the towing cable is at the end of the drum and the towing cable is in contact with the vertical roller at a certain angle, if the towing cable experiences a vertical run-out phenomenon, the inclination of the vertical roller causes the vertical roller of the towing cable to move. The contact point with respect to the vertical roller is shifted, thereby generating a force for rotating the vertical roller, and this force rotates the vertical roller so that the frictional force between the navigation cable and the vertical roller is minimized.

Therefore, according to this, the frictional force with the vertical roller caused by the vertical run-out phenomenon of the towing cable can be minimized, so that the coating on the surface of the towing cable is damaged by the frictional force,
The effect that the breakage of the towing cable can be prevented can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an embodiment of a toy cable suspension stand according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged side view of a main part of the embodiment. FIG. 4 is a side view showing a towing state of a ship provided with a hanging stand, FIG. 5 is a side view showing a conventional towing cable hanging stand, and FIG. 6 is a plan view thereof. 1 ... Vessel 2 ... Winch 2a ... Drum 2b, 2c ... Transversal machine roller 4 ... Navigation cable 5 ... Covered vehicle 6 ... Suspension stand 6a, 6b ... Vertical roller 6c, 6d ... Horizontal roller

Claims (1)

(57) [Claims] 1. A tow cable, comprising a pair of left and right rotatable vertical rollers and a pair of upper and lower rotatable horizontal rollers arranged close to the vertical rollers, for feeding and lifting a tow cable to which a covering body is attached. The pair of vertical rollers is provided for a winch including a drum installed on a ship for performing the collection and a translatory roller which moves in parallel with the drum and guides out and recovers the towing cable. In a structure of a towing cable suspension stand which is installed at a predetermined distance so as to be located on a winch side from a pair of lateral rollers and is suspended between the longitudinal rollers and the lateral rollers through a towing cable, A suspension for a towing cable, characterized in that the longitudinal roller is inclined such that the angle formed by the towing cable and the longitudinal roller between the machine roller and the longitudinal roller is 50 degrees or less. Structure of.