WO2008054047A1

WO2008054047A1 - Push-pull system for transporting load

Info

Publication number: WO2008054047A1
Application number: PCT/KR2007/001091
Authority: WO
Inventors: Myeong-Jun Jeong
Original assignee: Sungdong Shipbuilding & Marine Engineering Co., Ltd.
Priority date: 2006-11-03
Filing date: 2007-03-06
Publication date: 2008-05-08
Also published as: KR20080040549A; KR100839983B1

Abstract

Disclosed is a system for horizontally moving super heavy load such as a ship along skid rails on land including a hydraulic pressure generator and a push-pull device. In the hydraulic pressure generator, an engine, a generator, a motor, and a hydraulic pump are modulized into and mounted in a frame, and guide rollers are provided to move along skid rails. The push-pull device receives pressurized fluid from the hydraulic pressure generator to activate a pair of launching cylinders in opposite directions. A clamping device, coupled with the launching cylinders to push or pull the heavy load, allows the skid rails to be coupled with and fixed to push plates and jaws during the movement of the heavy load. When returning, the clamping device is released and returned without load so that the heavy load can be moved at a constant speed without stopping.

Description

PUSH-PULL SYSTEM FOR TRANSPORTING LOAD

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to an apparatus for moving a heavy load along rails, and more particularly, to an apparatus for moving a bogie train by pushing and pulling the bogie train to load a heavy load when a ship or a structure constructed on land is moved to a floating dock.

Description of the Related Art

Generally, a large-scale ship is constructed in a dry dock and launched by filling water in the dry dock. However, it takes a great deal of costs and time to construct the dry dock and there are many restrictions in constructing the dry dock due to discord with foreign countries. Thus recently, there is developed a launching method in which the large- scale ship is constructed on land and is launched by a sinking method of horizontally moving the constructed ship to a floating dock using a skid way and moving the floating dock to the deep sea to be sunk.

Korean Patent Application No. 2005-86673, filed prior to this application, proposes a method of horizontally launching a ship constructed on land in the longitudinal direction by constructing the ship on land, connecting the rails of a floating dock to come alongside an inner wall in the longitudinal direction to the skid rails of the inner wall by link beams, leveling by adjusting a ballast, and continuously moving the constructed ship along the skid rails by a push-pull apparatus to the floating dock to launch the ship.

In the patent application, since the proposed push-pull apparatus is described only in a conceptual view of the method, the present invention proposes a concrete structure thereof to enable those skilled in the art to easily make and use the present invention and is provided to contribute industrial development.

SUMMARY OF THE INVENTION

Therefore, the present invention has been made in view of the above problems, and it is an aspect of the present invention to provide an apparatus in which a control is easily performed when moving a big sized heavy load and safety and productivity can be improved while maintaining a constant speed.

It is another aspect of the present invention to provide an apparatus whose components are made in the form of modules for the convenient installation and movement of the apparatus.

It is still another aspect of the present invention to provide an apparatus to conveniently move a very large heavy load.

It is stall another aspect of the present invention to provide a bi-directional moving apparatus to push and pull a heavy load.

In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a push-pull system for moving a heavy load comprising a generator directly coupled with an internal combustion engine, a hydraulic pressure generator in which a modulized hydraulic pump directly coupled with a motor is mounted, and a push-pull device is modulized so that a hydraulic cylinder can grip skid rails and push and pull a heavy load.

A control unit to control the hydraulic pressure generator and the push-pull device is added to an outer side of a power generator such that a user controls the hydraulic pressure generator and the push-pull device while walking or may be configured by a control device in which a monitor and a measuring device are combined and modulized such that a user can mount the push-pull system for control. Moreover, the above described devices move along with the skid rails and can be separated from each other for movement and are coupled with each other again after the movement .

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side sectional view illustrating a push- pull system for moving a heavy load according to the present invention;

FIG. 2 is a plan view illustrating the push-pull system in FIG. 1;

FIG. 3 is a sectional view of a push-pull device taken along the line A-A in FIG. 1; FIG. 4 is a sectional view of a push-pull device taken along the line B-B in FIG. 1;

FIG. 5 is a side sectional view illustrating a frame cover of the push-pull device of the push-pull system according to the present invention; and FIG. 6 is a sectional view illustrating taken in the direction C in FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings .

FIG. 1 is a side sectional view illustrating a push- pull system for moving a heavy load according to the present invention, FIG. 2 is a plan view illustrating the push-pull system in FIG. 1, FIG. 3 is a sectional view of a push-pull device taken along the line A-A in FIG. 1, FIG. 4 is a sectional view of a push-pull device taken along the line B-B in FIG. 1, FIG. 5 is a side sectional view illustrating a frame cover of the push-pull device of the push-pull system according to the present invention, and FIG. 6 is a sectional view illustrating taken in the direction C in FIG. 5.

As illustrated in FIGS. 1 and 2, the push-pull system according to the embodiment of the present invention includes a hydraulic pressure generator 10 and a push-pull device 20. A control unit 30 is connected to the hydraulic pressure generator 10 such that an operator mounts the push-pull system to control the system while the control unit 30 is pulled along skid rails 40, or is configured such that the operator walks and controls the system using a control panel

11 provided at a side of the hydraulic pressure generator 10.

The hydraulic pressure generator 10 includes an engine

12, a generator 13, a motor 14, and a hydraulic pump 15 that are mounted to a frame including guide rollers 41 such that the hydraulic pressure generator 10 moves on the skid rails 40 and generates hydraulic pressure using a driving force generated therefrom.

The motor 14 and the hydraulic pump 15 include plural motors 14 and hydraulic pumps 15 to control flow rate by considering moving speed of a heavy load, such that the motors 14 and the hydraulic pumps 15 are selectively operated as needed, and the control panel 11 is provided to the side of the hydraulic pressure generator 10 to control the push- pull system. The hydraulic pressure generator 10 is connected to the push-pull device 20 by a hydraulic line (not shown) to be pulled during the movement of the push-pull device 20, and a control unit 30 may be connected to a side opposite to the side connected to the push-pull device 20. Since two pairs of the push-pull systems of the present invention are connected to each other on four skid rails 40, the control unit 30 is connected to simultaneously control the two pairs of the push-pull systems by control cables.

The push-pull device 20, as illustrated in FIG. 5, includes clamping devices 22 to clamp the skid rails 40, launching cylinders 23 that are mounted to a frame cover 21 having guide rollers 41 installed at front and rear sides thereof, and piston rods 24 for the launching cylinders 23 that are coupled with an end of the frame cover 21. The clamping devices 22 and the launching cylinders 23, mounted in the frame cover 21, are separately provided on the respective skid rails 40 such that a pair of the clamping devices 22 and a pair of the launching cylinders 23 are mounted in the single frame cover 21. With a side of the frame cover 21 opposite to a side to which the hydraulic pressure generator 10 is connected, a plate 25 is coupled to push or pull the heavy load being moved. To a lower side of the plate 25, that is to the lower sides of heads of the skid rails 40 with which the guide rollers 41 provided at the leading end of the push-pull device 20 are in contact as illustrated in FIG. 6, fixing rollers 26 are provided to prevent the leading end of the frame cover 21 from rising up when the frame cover 21 pushes the heavy load. Since a large force is required to move the heavy load from a still state, the heavy load to be moved must be moved at a constant speed without stopping during the movement.

A pair of the launching cylinders 23 pushes out and pulls in the piston rods 24 in opposite directions such that the push-pull device 20 can push or pull the heavy load without stopping. When a single launching cylinder 23 moves the heavy load, the clamping device 22 coupled with the launching cylinder 23 clamps the skid rails 40 such that a force of the launching cylinder 23 is transmitted to the frame cover. The other launching cylinder 23 releases the clamping device 22 and pushes and pulls the piston rod in the directions opposite to the directions of the piston rod 24 of the launching cylinder 23 is performing the movement such that the other launching cylinder 23 takes over the movement before the piston rod 24 of the launching cylinder being performing the movement reaches the top dead center or the bottom dead center.

Although the pair of the launching cylinder 23 mounted in the frame cover 21 may be actuated in the directions opposite to each other, a pair of the push-pull devices 20 activates the launching cylinders 23 in the opposite directions such that a pair of the launching cylinders 23 mounted in parallel in the single frame cover 21 can be controlled to be actuated in the same direction. When the clamping devices 22 to fix or release the launching cylinders 23 to or from the skid rails 40, as illustrated in FIG. 3, pushes down push plates 27 contacting the heads 42 of the skid rails 40 using hydraulic devices 29 to closely contact the heads 42, the clamping devices 22 float up and jaws 28 integrated with the clamping devices 22 closely contact the lower sides of the heads 42 of the skid rails 40 so that the clamping devices 22 are fixed to the skid rails 40.

Contacting surfaces of the push plates 27 and the jaws 28 with the skid rails 40 are knurled so as to secure the close contact.

The control unit 30 integrates control devices of the push-pull system into a single unit to effectively control the push-pull system. In the control unit 30, a display is provided to display data detected by various meters and sensors, provided in the push-pull devices 20 and the hydraulic pressure generator 10, and a hydraulic control device is also provided such that the operator mounts to control the push-pull system. As described above, in the push-pull system according to the present invention, a constant speed can be maintained without applying shock to a heavy load or a movement apparatus during the movement of a very big and heavy load along the skid rails, and stopping and reverse movement of the movement are freely and conveniently controlled. Moreover, since the push-pull system is modulized, the installation and movement of the system are convenient so that a super heavy load such as a ship can be moved in safe and rapid manner.

Claims

WHAT IS CLAIMED IS:

1. A push-pull system for moving a heavy load comprising: a hydraulic pressure generator including an engine, a generator, a hydraulic pump that are modulized, and guide rollers to move along skid rails; a push-pull device to receive pressurized fluid from the hydraulic pressure generator to activate a pair of launching cylinders in directions opposite to each other; and a clamping device to fix and release the launching cylinders to and from the skid rails using a hydraulic device .

2. The push-pull system for moving a heavy load according to claim 1, wherein the heavy load is continuously moved such that the launching cylinders are fixed to the skid rails by the clamping device when pushing and pulling the heavy load and the clamping device is released to alternately activate the pair of the launching cylinders when returning the launching cylinders.

3. The push-pull system for moving a heavy load according claim 1, wherein the clamping device comprises: push plates to be closely contacted to heads of the skid rails by the hydraulic device; and jaws to contact lower sides of the heads of the skid rails .

4. The push-pull system for moving a heavy load according to claim 1, wherein each of the launching cylinders of the push-pull device is configured that a piston rod is fixed to a frame cover such that each of the launching cylinders pushes out and pulled in the piston rod within the frame cover and a plate provided in a front side of the push-pull device pushes and pulls the heavy load.

5. The push-pull system for moving a heavy load according to claim 1, further comprising a control unit, in which meters, sensors, and control devices are modulized to integrally control the hydraulic pressure generator and the push-pull device, to move along the skid rails.