JP5901826B1 - Tugboat winch - Google Patents

Abstract

Provided is a hydraulic tugboat winch having a small impact when an overload exceeding a normal braking force is applied in a hydraulic band brake device mounted on a winch. A brake drum 13 that rotates integrally with a winch drum 12, a brake band 14 that is wound around the brake drum 13 so as to be freely expandable and contractable in a circumferential direction, and one end portion of the brake band 14 that are connected to each other by a spring. A brake mechanism 15 that pulls the brake band 14 toward the brake side and loosens the brake band 14 against the tension of the spring by the first hydraulic cylinder 44, and the other end of the brake band 14 provided at the other end of the brake band 14 A support mechanism 16 that holds the position of the other portion and releases the position of the other end when the brake band 14 is overloaded. [Selection] Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tugboat winch in which a rope is wound around a drum so that the large ship can be towed and wound.

A large ship such as a tanker is towed to a port including a fishing port by a tug boat equipped with a winch for winding or unwinding a tow rope. The winch is provided with a hydraulic band brake device. For example, in Patent Document 1, a load cell is used to detect a load of a brake to adjust the load.

Japanese Patent No. 5345991

However, in a hydraulic band brake device that tightens the brake drum arranged on the side of the winch drum with a brake band composed of a tension side band and a pull side band, the brake is released when the brake device is under load. The only way to do this is to loosen the retracting side band, but even if the retracting side band is loosened, the friction material (brake shoe) of the tension side band may bite into the brake body due to the load and remain in a high friction state. is there. When high friction is released from this state at once, it is very dangerous because it involves a large impact.

In addition, in the case of a brake device equipped on a towing winch mounted on a tug boat that tows a large ship such as a tanker or a base boat, the load load of the brake device that is held during towing is as large as about 80 tons. If the situation suddenly changes, the load applied to the brake device due to the hull swaying, etc. will become even larger. Therefore, for safe navigation such as protection of the brake device, stability of the hull, avoidance of dangerous navigation, overload applied to the brake device There is a demand for a brake device that can be released smoothly without impact.

In the loosening operation of a loaded hydraulic band brake device, to loosen the retracting band of the brake band wound around the brake drum, start the hydraulic pump and operate the operating lever (button) to apply pressure to the hydraulic cylinder. Work to feed oil is necessary.
In addition, when overloading, complicated equipment that detects and determines abnormal load signals and the above-mentioned series of operations, such as starting a hydraulic pump, are necessary, and it takes time to release an emergency overload. The poor responsiveness is different from the required safety, and depending on the control, it may become a pre-built equipment that is not effective.

The present invention has been made in view of such circumstances, and in a hydraulic band brake device equipped in a winch, even when an overload exceeding a normal braking force is applied, a hydraulic type brake device that has less impact when releasing the overload is provided. The purpose is to provide a winch for a tugboat.

A tugboat winch according to the present invention that meets the above object is a tugboat winch in which a winch drum that winds a rope for towing is provided so as to be capable of forward and reverse rotation and rotational braking,
A brake drum that rotates integrally with the winch drum, a brake band that is wound around the brake drum in a circumferential direction, and a brake band that is connected to one end of the brake band, and is connected to the brake side by a spring A brake mechanism that loosens the brake band against the spring tension by a first hydraulic cylinder, and is provided at the other end of the brake band to hold the position of the other end of the brake band. , possess a support mechanism for solving the position held by the other end at the time of overload of said brake band, moreover,
The position holding of the other end of the brake band by the support mechanism is performed at the stroke end of the second hydraulic cylinder constituting the support mechanism, and the release of the position holding at the time of overload is performed by the second hydraulic cylinder. Is performed by a relief valve provided in a hydraulic circuit on the side that pressurizes the stroke end.

That is, the pressure to the stroke end of the second hydraulic cylinder is performed by the hydraulic circuit. When an overload is applied, the relief valve of the hydraulic circuit is opened, and the position holding by the second hydraulic cylinder is released.

In the tugboat winch according to the present invention, the other end of the brake band is pivotally attached to the tip of the one side arm of the first link member, and the other side arm of the first link member It is preferable that the driving side tip of the second hydraulic cylinder is in contact with the lower part.

In the tugboat winch according to the present invention, the second hydraulic cylinder is preferably a trunnion type. Thereby, the direction of the second hydraulic cylinder can be made to follow the angle of the other side arm, and the tensile force from the second hydraulic cylinder is not transmitted to the other side arm.

In the tugboat winch according to the present invention, a short arm of the second link member is connected to one end of the brake band via a turnbuckle, and the long arm of the second link member is connected to the brake mechanism. Should be connected.

The tugboat winch according to the present invention is connected to one end of a brake band that is wound around the brake trunk in a circumferential direction, and pulls (retracts) the brake band to the brake side with a spring. Since it has a brake mechanism that loosens the brake band against the pulling of the spring, driving the first hydraulic cylinder against the spring changes the pulling force of the brake band and smoothly brakes the brake body. it can.

In addition, it has a support mechanism that is provided at the other end of the brake band and holds the position of the other end of the brake band and releases the position of the other end when the brake band is overloaded. Even if a heavy load is applied, the load can be absorbed.

In the tugboat winch according to the present invention, the position holding by the support mechanism is performed at the stroke end of the second hydraulic cylinder, and the release of the position holding at the time of overload is applied to the second hydraulic cylinder at the stroke end. of is performed by the relief valve provided in the hydraulic circuit, when an excessive load on the brake band is applied,-out relief valve of the hydraulic circuit is opened, it absorbs the excessive load, the other end of the brake band constant pressure Can be hung.

In the tugboat winch according to the present invention, the other end of the brake band is rotatably attached to the tip of the one side arm of the first link member, and is attached to the lower part of the other side arm of the first link member. When the drive side tip of the second hydraulic cylinder constituting the support mechanism comes into contact, the load from the second hydraulic cylinder is transmitted only to one side.
In this case, by making the second hydraulic cylinder a trunnion type, the driving side tip of the second hydraulic cylinder smoothly contacts the lower part of the other arm.

It is explanatory drawing of the winch for tugboats concerning one embodiment of this invention. (A) is the same top view, (B) is the same part abbreviation plane sectional view. (A) is the front view, (B) is the side view. (A)-(C) are the operation | movement explanatory drawings. (A)-(C) are operation | movement explanatory drawings of a 1st hydraulic cylinder.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 5, a tugboat winch 10 according to an embodiment of the present invention includes a winch drum 12 that winds a tow rope 11, and a brake that rotates integrally with the winch drum 12. A cylinder 13, a brake band 14 wound around the brake cylinder 13 in a circumferential direction, a brake mechanism 15 connected to one end of the brake band 14 on the retracting side, and the tension side of the brake band 14. It has a support mechanism 16 provided at the end and a pedestal 17 that supports them. Usually, the support mechanism 16 is in a fixed state, and the brake mechanism 15 changes the frictional state between the brake body 13 and the brake band 14, The winch drum 12 is braked and released. These will be described in detail below.

The winch drum 12 having the body 18 and the side plates 19 and 20 provided on both sides thereof, and the annular brake cylinder 13 having a radius larger than that of the body 18 are integrated, and have a main shaft 24 at the center. The both sides are rotatably supported by bearings 25 and 26. The bearings 25 and 26 on both sides are supported at predetermined positions by the support member 26a. A drum drive mechanism 27 is provided on one side of the main shaft 24 so that the winch drum 12 can be rotated forward and backward and can be controlled in rotation.

The drum drive mechanism 27 includes a large gear directly attached to the main shaft 24, a small gear meshing with the large gear, a hydraulic motor that rotationally drives the small gear, and a support member for these. For example, it is basically the same as the structure of Japanese Patent No. 5714163 and Japanese Patent No. 5345991).

The brake band 14 is provided with a brake shoe 29 on the inner side, and is intended to slide (friction engagement) with the brake body 13. The brake shoe 29 is generally made of a friction material obtained by impregnating a special synthetic resin binder into a blended cotton fabric woven with special glass fibers containing metal wires, and heated and pressurized. Fixed to the inner surface. The brake band 14 has an arc shape and is divided into two, and an intermediate portion is fixed by a connecting member 30. Further, a part of the brake band 14 is supported by a holding member 30a.

A turnbuckle 35 having first and second female screw fittings 32 and 33 and a male screw 34 is provided at one end of the brake band 14 via a fitting 30b. A short arm (vertical arm) 39 of the second link member 38 is rotatably connected to the second female screw fitting 33 of the turnbuckle 35, and a long arm (horizontal arm) 40 of the second link member 38. A brake mechanism 15 is connected to the motor. Here, as shown in FIGS. 2A and 2B, the second link member 38 has a rotating shaft 37 supported by the support member 36 via a bush, and has a short arm 39 and a long arm 40. Are integrally provided on both sides of the rotating shaft 37.

As shown in FIGS. 3B, 5A, 5B, and 5C, the brake mechanism 15 includes a spring cylinder 42 on the lower side and an operating rod 43 that extends into the spring cylinder 42 on the upper side. The first hydraulic cylinder 44 is provided. A piston 45 of the first hydraulic cylinder 44 is provided at the upper part of the operating rod 43, and a connecting fitting 46 is provided at the lower part so as to protrude from below the spring cylinder 42.

An upper spring receiver 48 is provided at an intermediate position of the operating rod 43, and coil springs (an example of a spring) 50, 51 are provided between the upper spring receiver 48 and the lower metal fitting 49 of the spring cylinder 42 in an inner and outer double. It has been. As a result, when the piston 45 does not descend from the first hydraulic cylinder 44, the upper spring receiver 48 is pushed up by the coil springs 50 and 51, and the operating rod 43 has an upper limit as shown in FIG. It becomes a position state.

Next, when pressure oil is supplied to the first hydraulic cylinder 44 and the piston 45 is lowered, the coil springs 50 and 51 are compressed to an intermediate position (see FIG. 5B), and then the lower end of the operating rod 43 The connecting metal fitting 46 provided at the lowermost position is in the lowest position (see FIG. 5C). The connection fitting 46 is rotatably connected to the long arm 40 of the second link member 38.

Accordingly, assuming that the other end of the brake band 14 is fixed, the brake band 14 is loosened when the piston 45 of the first hydraulic cylinder 44 is at the lower limit, and the first hydraulic cylinder 44 is moved to the first hydraulic cylinder 44. When the supply of pressure oil is stopped and the oil is released to the tank 69, if the piston 45 is in a position that does not reach the upper limit position including the intermediate position, a spring force is applied, thereby tightening the brake band 14. (Retracted) The brakes are activated. Thus, the tugboat winch 10 is always braked against an unexpected accident such as a power failure.

Next, the support mechanism 16 will be described with reference to FIGS. 1, 2 </ b> A, 3 </ b> A, 3 </ b> B, and 4 </ b> A to 4 </ b> C.
The tip of the one-side arm 57 of the first link member 56 is attached to the other end of the brake band 14 via a mounting bracket 55. The first link member 56 is rotatably disposed on a support member (not shown) by a rotation pin 58.

The other arm 59 of the first link member 56 is elongated, and the upper flat surface (driving side front portion) of the piston rod 62 of the trunnion type second hydraulic cylinder 61 is disposed on the lower flat surface 60 on the front side. It is in contact. The second hydraulic cylinder 61 that constitutes the support mechanism 16 is provided with hydraulic connection ports 63 and 64 that communicate with the upper and lower chambers of the piston of the second hydraulic cylinder 61. The generated hydraulic pressure is always applied to the hydraulic connection port 64 via the electromagnetic valve 67 and the check valve 68. The hydraulic connection port 63 is connected to the tank 69 via an electromagnetic valve 67. 70 is a pressure sensor and 71 is a control unit.

Accordingly, the tip of the piston rod 62 of the second hydraulic cylinder 61 is a stroke end, and comes into contact with the lower flat surface 60 of the first link member 56 being lifted.
A relief valve 73 is provided in the hydraulic circuit connected to the hydraulic connection port 64 for supplying the pressurized oil so as to pressurize the second hydraulic cylinder 61 at the stroke end, and the piston rod 62 of the second hydraulic cylinder 61 is provided. When a large load is applied to the oil, oil escapes from the relief valve 73 and the piston rod 62 descends. The load at this time is the pressure area of the piston × oil pressure.

Accordingly, the position of the other end portion of the brake band 14 is not moved by the support mechanism 16 because the pressure held by the second hydraulic cylinder 61 is within the set pressure of the relief valve 73 of the hydraulic circuit under a normal load. (The position is maintained). On the other hand, when the overload occurs, the pressure in the lower chamber connected to the hydraulic connection port 64 becomes equal to or higher than the set pressure of the relief valve 73, the relief valve 73 is opened, and the amount of pressurized oil in the lower chamber is reduced. The piston rod 62 of the hydraulic cylinder 61 is lowered, and the other end side (tension side) of the brake band 14 is loosened (releasing its position holding).

At this time, the brake band 14 slides on the circumference of the brake body 13, and the movement amount is transmitted to one end side (retraction side) of the brake band 14, and the second link member 38 connected to the brake band 14. The long arm 40 is pushed up. As a result, the bending dimensions of the coil springs (compression springs) 50 and 51 for pulling one end of the brake band 14, that is, the overall length is extended, and the spring force is commensurately reduced.

Further, the brake band 14 slides to the loose side, and the biting by the load between the brake shoe 29 and the brake drum 13 is released. On the other hand, the brake band 14 is not retracted suddenly because the pull-in is maintained by a spring force having a deflection amount commensurate with the amount of movement of the brake band 14 on the outer periphery of the brake drum 13. Therefore, there is no impact that occurs when the biting of the brake shoe 29 is released.

Further, since only the braking force corresponding to the tightening force generated by the coil springs 50 and 51 acts as a resistance to the rotation of the brake drum 13, the rope 11 (wire) wound around the drum portion (winding drum) 18 is used. Rope) is released in an amount commensurate with overload.

Since the overload applied to the brake mechanism 15 holds the position of the other end of the brake band 14 with the second hydraulic cylinder 61, pressure oil equivalent to the load applied to the second hydraulic cylinder 61 is relieved. By letting it escape with the valve 73, it can be released instantly.
In addition, it is not necessary to detect overload electrically (eg, with a load cell) and feed back to a series of operations such as starting the hydraulic pump and loosening the pull-in side band as in the past. Excellent.

By configuring the hydraulic circuit so that the pressure oil equivalent to the load applied to the second hydraulic cylinder 61 that holds the position of the other end of the brake band 14 is released to the tank 69 by opening the relief valve 73 instantaneously. The braking force applied to the brake body 13 is eliminated, and the rope 11 can be released from the body part 18 freely. Further, in the event of an emergency when the tugboat is towed, it becomes a safety device that can quickly release the rope 11 and leave it.

In the hydraulic circuit of the second hydraulic cylinder 61 that holds the position of the other end of the brake band 14, the line on the rod side and the head side are connected by a closing valve (such as a stop valve) 75. Since the holding pressure can be released quickly by setting it to “open”, the emergency release of the brake can be performed.
In addition, a pressure sensor 70 is provided in the hydraulic circuit on the holding side of the second hydraulic cylinder 61 that holds the position of the other end of the brake band 14, and it is safe by transmitting “display” and “alarm” indicating overload. Can sail.

The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention.
For example, in this embodiment, the brake drum 13 is attached to the side plate of the winch drum 12, but is a brake drum structure having an annular plate and a side plate independently, and is integrated with the winch drum 12 and, in some cases, the main shaft 24. If it becomes, this invention is applied.

10: Tugboat winch, 11: rope, 12: winch drum, 13: brake drum, 14: brake band, 15: brake mechanism, 16: support mechanism, 17: mount, 18: trunk, 19, 20: side plate, 24: main shaft, 25, 26: bearing, 26a: support member, 27: drum drive mechanism, 29: brake shoe, 30: connecting member, 30a: holding member, 30b: mounting bracket, 32: first female screw bracket, 33 : Second female screw fitting, 34: male screw, 35: turnbuckle, 36: support member, 37: rotating shaft, 38: second link member, 39: short arm, 40: long arm, 42: spring cylinder, 43 : Actuating rod, 44: First hydraulic cylinder, 45: Piston, 46: Connection fitting, 48: Upper spring receiver, 49: Lower fitting, 50, 51: Coil spring, 5 : Mounting bracket, 56: first link member, 57: one side arm, 58: rotating pin, 59: other side arm, 60: lower plane, 61: second hydraulic cylinder, 62: piston rod, 63, 64: Hydraulic connection port, 65: Hydraulic source, 67: Solenoid valve, 68: Check valve, 69: Tank, 70: Pressure sensor, 71: Control unit, 73: Relief valve, 75: Closing valve

Claims (4)

A winch drum for winding a tow rope is a tugboat winch provided to be capable of forward and reverse rotation and rotational braking,
A brake drum that rotates integrally with the winch drum, a brake band that is wound around the brake drum in a circumferential direction, and a brake band that is connected to one end of the brake band, and is connected to the brake side by a spring A brake mechanism that loosens the brake band against the spring tension by a first hydraulic cylinder, and is provided at the other end of the brake band to hold the position of the other end of the brake band. , possess a support mechanism for solving the position held by the other end at the time of overload of said brake band, moreover,
The position holding of the other end of the brake band by the support mechanism is performed at the stroke end of the second hydraulic cylinder constituting the support mechanism, and the release of the position holding at the time of overload is performed by the second hydraulic cylinder. A tugboat winch characterized in that it is carried out by a relief valve provided in a hydraulic circuit on the side that pressurizes the stroke end . 2. The tugboat winch according to claim 1 , wherein the other end of the brake band is rotatably attached to a tip of one side arm of the first link member, and the other side arm of the first link member A tugboat winch, characterized in that a drive side tip of the second hydraulic cylinder abuts the lower part. 3. The tugboat winch according to claim 2 , wherein the second hydraulic cylinder is a trunnion type. 4. The tugboat winch according to claim 1, wherein a short arm of a second link member is connected to one end portion of the brake band via a turnbuckle, and the length of the second link member is increased. A tug winch, wherein the brake mechanism is connected to the arm.

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