JPS61261188A - Fixing device of vertically movable thruster - Google Patents

Abstract

PURPOSE:To make the power for fixedly maintaining a thruster unnecessary by arranging a tight-fit sleeve tightening a rod via the hydraulic operation on the rod insertion section of an elevator bed and tightening the elevator bed against the rod via the friction force by the elasticity of this sleeve. CONSTITUTION:A thruster 1 is horizontally rotatably supported by a supporting tube 5, and an elevator bed 8 is provided at the upper end of this supporting tube 5. This elevator bed 8 is lifted or lowered by a lifting hydraulic cylinder 9, thereby the truster 1 is lifted or lowered between the storage position and usage position. Guide rods 10, 10a are inserted through this elevator bed 8, which is guided by the guide rod 10 and is lifted or lowered. A tight-fit sleeve 12 is provided at the rod 10 insertion section of the elevator bed 8. This tight-fit sleeve 12 tightens the rod 10 via its elastic force to hold the elevator bed 8 at a predetermined position. The sleeve 12 is expanded by the hydraulic pressure and the tightening force is released.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a thruster for a ship having a lifting device in which the thruster protrudes outside the hull when in use and is pulled up and stored inside the hull when stored. The present invention relates to a device for fixing a thruster to a ship's hull in a use position and a storage position of the thruster.

(Prior art) In a ship thruster that has a lifting device in which the thruster protrudes outside the hull when in use and is housed inside the hull when stored, the thruster is attached to the hull in order to transmit the thrust generated by the thruster to the hull when in use. Please fix it firmly on the side (necessary).

Conventionally, the method of fixing this type of thruster to the ship's hull in the operating position is to always apply constant hydraulic pressure to the thruster's lifting device, that is, the lifting cylinder, and press the support arm that is integrated with the thruster against the ship's hull to fix the thruster. It has been realized.

On the other hand, when the thruster is pulled up and stored inside the ship, it is required to be fixed so that the thruster does not sway due to any hull movement, but when the thruster is stored, it is different from when the thruster is in use. On the other hand, power sources such as hydraulic pressure can also be stopped, making it impossible to use hydraulic pressure to lift and secure the thruster and its associated components, and the thruster cannot be placed in its retracted position when it is pulled up into the hull. At present, they are fixed using methods such as manual screw tightening.

(Problems to be solved by the invention) As mentioned above, in the conventional thruster fixing device,
When the thruster is in use, it requires power to constantly generate hydraulic pressure to secure it in place, while when it is retracted, a complicated device is required to suspend and secure it, and furthermore, securing it in the retracted position requires manual labor by workers. This makes the work complicated and the reliability of the firm fixation is low (there are also problems such as the thruster swinging due to severe hull movement, which can cause various troubles).

This invention was made in order to improve the above-mentioned points, and an interference-fitting sleeve is disposed in the insertion part of a rod that is inserted into a lifting platform on which a thruster is suspended and serves as a guide for the lifting platform. The elevating platform is tightened against the rod by the frictional force generated by the sleeve's elasticity, and the thruster is firmly fixed to the ship's hull in its use position and storage position, and power such as hydraulic pressure is not required to maintain the thruster fixed. The purpose is to provide a thruster fixing device.

(Means for Solving the Problems) The gist of this invention to achieve the above object is to provide a storage position in which the thruster is pulled up and stored inside the hull, and a use position in which the thruster is projected outside the hull. A lifting platform with a thruster suspended thereon is guided by a rod provided on the hull to move up and down, and the lifting platform is hydraulically actuated at the rod insertion part of the platform. A fixing device for an elevating thruster, characterized in that the rod is provided with an interference fit sleeve for tightening the rod, the rod is divided in the middle part, and a spacer made of a highly elastic material is sandwiched between the divided parts. .

(Example) Examples of the present invention will be described below based on the drawings.

I will clarify.

FIG. 1 is a sectional view of the main part with the thruster in the use position, and FIG. 2 is a sectional view of the main part with the thruster in the retracted position.

In the figure, 1 is a thruster, and a scree propeller 1a
has. 2 is a support arm provided on the upper part of the thruster, and 3 is a lower block with which the tip of the support arm engages at a position where the thruster 1 protrudes outside the hull when the thruster is in use, and transmits the thrust of the thruster 1 to the hull. 4 is an upper block with which the tip of the support arm engages when the thruster 1 is stored in the hull; 5
1 is a support cylinder which supports the thruster 1 so as to be able to rotate in a horizontal plane, and an elevating platform 8 is provided at the upper end of the support cylinder 7 which penetrates the support body 7 provided on the hull floor surface 6. 9 is a hydraulic cylinder for lifting connected to the lifting platform 8, and 10 is a pin 11 at both upper and lower ends on the hull side.
A plurality of rods are attached to the lift table 8 and inserted through the lifting table 8 to guide its lifting and lowering movements.

Reference numeral 12 denotes an interference-fitting sleeve disposed in the rod insertion portion of the lifting platform 8, which is hydraulically operated by utilizing the property that metal elastically deforms when the pressure inside the body changes.
(not shown) and tightens the rod 10 by the frictional force due to the elasticity of the sleeve 12 when no oil is supplied, and expands the sleeve 12 in the circumferential direction by supplying pressure oil to release the tightening force on the rod 10. It is.

The rod 10 has an upper rod 10 at its intermediate portion.
The rod 10a is divided into a lower rod 10b and a shaft portion 10c and a cylindrical portion 10d that are fitted together so that the rod 10c can be expanded and contracted within an appropriate length range in the longitudinal direction of the rod.

The gap between the divided parts of the sleeve 10b absorbs the expansion and contraction of both the rods 10a and 10b, and prevents pressure oil from leaking when the sleeve 12 of the lifting platform 8 passes through the divided part.
A spacer ring 13 made of a highly elastic material is sandwiched in order to prevent damage to the seal portion of the sleeve 2 and to smoothen the movement of the sleeve 12. 14 is this spacer ring 13
This is an oil hole drilled through both the inner and outer surfaces of the sleeve to equalize the pressure from both the inner and outer surfaces when the sleeve passes through.

(for production) In the above configuration, the operation will be explained next.

When protruding thruster 1 from the storage position to the outside of the ship bottom,
When pressure oil is supplied to the sleeve 12 arranged on the lifting platform 8,
The sleeve 12 expands in the circumferential direction and the sleeve 12 is unfastened from the rod 10. Therefore, under this condition, when the lifting hydraulic cylinder 9 is extended and the lifting table 8 is pushed down together with the support cylinder 5 and the thruster 1, the tip of the supporting arm is finally pressed against the lower block 3 on the hull side. Further, the sleeve 12 is pressed so as to strengthen this pressing force.
When the pressure oil is removed, a tightening force is generated in the sleeve 12, tightening the loft 10, and the lifting platform 8 is locked to the lower rod 10b.

In this case, the rod 1 is removed by removing pressure oil from the sleeve 12.
0 is performed with the tip of the support arm strongly pressed against the lower block 3 by the operation of the lifting hydraulic cylinder 9, that is, with compressive force acting on the support cylinder 5. After the operation is stopped, a reaction force based on the deflection of the support arm 2 acts on the lifting platform 8 locked to the lower rod 10b, and a tensile force acts on the lower rod tab upwards from the floor surface to fix it.

In addition, at this time, the upper rod 10a from the lower rod 10b
The thrust force to the ring 13 sandwiched between the two rod parts
, and no compressive force is applied to the upper loft 10b.

Therefore, when the thruster 1 is in use, only an upward tensile force acts on a portion of the rod 10.

Next, in order to lift the thruster 1 from the use position and store it in the hull, pressurized oil is supplied to the sleeve 12 of the lifting platform 8 and the tension on the rod 10 is released. That is, this is carried out while the pressure oil is being supplied to the sleeve 12. In this state, when the lifting platform 8 is pulled up by the contraction operation of the lifting hydraulic cylinder 9, the lifting platform 8 is raised using the rod 1O as a guide. At this time, when the sleeve 12 of the lifting platform 8 moves from the lower rod 10b to the upper rod 10, a spacer ring 13 made of a highly elastic material is sandwiched between the rod division parts.
In order for the pressure oil supplied to the sleeve 12 to pass through the spacer ring 13, an oil passage hole 14 is formed through the inner and outer surfaces of the spacer ring 13.
The pressure oil also flows into the inner surface of the spacer ring 13, and the pressure oil acts uniformly on both the inner and outer surfaces of the ring, allowing the pressure oil to pass through without any leakage.

Then, when the lifting platform 8 reaches near the end point of lifting, the tip of the supporting arm is pressed against the upper block 4. Here too, press the sleeve 12 to increase this pressing force.
When the pressure oil is removed, a tightening force is generated in the sleeve 12, tightening the rod 10, and the lifting platform 8 is locked to the upper opening 7 door 10a.

In this case, the rod 1 is removed by removing pressure oil from the sleeve 12.
Tightening with respect to 0 is performed in a state in which the tip of the support arm is strongly pressed against the upper block 4 by the operation of the lifting hydraulic cylinder 9, that is, in a state in which a tensile force is applied to the support cylinder 5.

Here, too, the pushing down force from the upper loft 10a to the lower loft 10b is absorbed by the ring 13 sandwiched between the two rod division parts, and no compressive force is applied to the lower rod 10a.

Therefore, after the lifting hydraulic cylinder 9 stops operating, the support arm 2
A reaction force based on the deflection acts on the lifting platform 8 locked to the upper rod 10a, and the weight of the lifting platform 8, the support cylinder 5, and the thruster 1 is also applied, and a downward tensile force acts on the upper rod 10a, causing the thruster to move. 1 is fixed.

(Effects) As is clear from the above description, the present invention has a method in which a rod on the hull side that is inserted into a lifting platform on which a thruster is suspended and which guides the vertical movement of the lifting platform is divided into two parts in the middle. A spacer ring made of a highly elastic material is sandwiched between the rods, and the rod insertion portion of the lifting platform is connected to an external hydraulic power source. Equipped with an interference fit sleeve that tightens the
By operating the lifting hydraulic cylinder, the lifting platform is locked against the rod with the supporting arm integrated with the thruster pressed against the upper or lower block on the hull side, and the fixing force based on the deflection of the supporting arm is applied. Since it is made to act only as a tensile force on one of the divided rods via the lifting platform, there is no need to consider buckling of the rod as when compressive force is applied to the rod in terms of strength. It is possible to use a mending rod that can withstand tensile force, making the fixing device compact, and when the lifting platform is being raised or lowered, only by supplying pressure oil into the sleeve to release the lock on the rod of the lifting platform, the thruster can be fixed. Because there is no need to supply pressure oil to keep the thruster fixed in the operating and storage positions, the associated hydraulic system is simplified and the equipment is less expensive, and there is no need for manual work to fix the thruster. , it has excellent effects such as ensuring that the thruster is kept fixed and reliability is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part with the thruster in the use position, FIG. 2 is a sectional view of the main part with the thruster in the retracted position, and FIG. 3 is a partial sectional view of the rod. DESCRIPTION OF SYMBOLS 1... Thruster, 2... Support arm, 3... Lower block, 4... Upper block, 5... Support tube, 6...
- Floor surface 7...Support, 8...Elevating platform, 9...Elevating cylinder, 10...Rod, 11...Bin, 12
...Tight fit sleeve, 13--Spacer ring, 14--Oil hole.

Claims (3)

[Claims] (1) The thruster is suspended, with a storage position where the thruster is pulled up and stored inside the hull, and a use position where the thruster is projected outside the hull, with pressing means and a lifting device that are pressed against the hull side. In a platform where the platform moves up and down while being guided by a rod installed on the hull, the rod insertion part of the platform is equipped with an interference fit sleeve that tightens the rod using hydraulic pressure, and the rod is divided in the middle to fit the rod. A fixing device for an elevating thruster, characterized in that a spacer made of a highly elastic material is sandwiched between the divided parts. (2) The tight-fitting sleeve loosens the tightening of the rod when feeding pressure oil, enables the lifting platform to move up and down, and tightens the rod when no oil is supplied. Fixing device for lifting thrusters. (3) The elevating thruster fixing device according to claim 1, wherein the rod has a structure in which a shaft portion and a cylindrical portion are fitted in the split portion so that the rod can extend and contract in the longitudinal direction.