BG110544A - A cantilever with double jiggers and hydraulic drive - Google Patents

Abstract

The cantilever with double jiggers and hydraulic drive is applied on ships, other transport means or as a loading device in stationary conditions. The advantages of the cantilever in comparison with the known hydraulic cantilevers are that, instead of with two or three hydraulic cylinders, it allows to accomplish the two movements û change of the reach and rotation û only with one inbuilt in the cantilever hydraulic cylinder, which makes the construction considerably lighter for the ships and because of its low disposition is essential for their stability, as well as for their cost. The cantilever with double jiggers involves an in-built cylinder (2), which means that it is a part of the cantilever (1), and one of the jiggers (5), after passing through the block, fixed upon the erection site (16), passes through the diverting rollers (12, 14, 15), covers the movable roller (8), installed upon the hollow piston rod (9) of the movable piston, its end being immovably fixed to the front part of the guiding tube (6). The change of the cantilever reach is achieved by feeding oil into the space ôAö and simultaneously the change of the volume in the space ôBö is prevented, i.e. the movable piston is blocked together with the hollow piston rod (9) and the fixed to it movable pulling out roller (8), at the same time an equal quantity of oil is released from the space ôCö. The rotation of the cantilever (1) to the left or to the right is accomplished by giving the movable roller (8) the possibility to follow the hydro cylinder (2), which means that together with feeding oil into the space ôAö approximately the same quantity of oil is released from the space ôbö.

Description

SUBSTANCE: invention relates to double-tapered crane boom and hydraulic actuator, which can be used as a loading device intended for lifting and moving loads.

BACKGROUND OF THE INVENTION

Known cargo-type two-pointing arrows of the type ..Halen, Velle, Ebel and others, applicable to ship loading and unloading operations in cases where a roll greater than 5 degrees is required, permissible for rotary deck cranes.

The downside of these arrows is that it required two separate winches in addition to the load -

for each individual topenant.

Hydraulic crane booms are known to be applicable to ships, other vehicles or as stationary loading devices.

The disadvantage of the crane booms is that they are provided with two for the implementation of movements related to load positioning (change of range and rotation). and in some cases, three hydraulic actuators (hydraulic cylinders or motors), in which the boom is loaded with the necessary torque in addition to pressure.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a hydraulically actuated crane boom capable of performing two movements / change of range and rotation / using only the

one hydraulic cylinder.

The object of the invention is solved by a double-tapered crane boom. in which the hydraulic! cylinder is built in, ie the tune is part of the boom, and one of the topenant, after passing through the block secured to the salish pad, passes through deflecting rolls, comprises a movable roll mounted on the hollow piston rod of a movable piston. after which the end is fixed to the front of the guide tube.

Changing the range of the boom is facilitated by feeding oil into the space ..A while preventing volume change in the space ..B ”, ie. the movable piston is blocked together with its hollow piston rod and the movable pull roller attached thereto, while at the same time draining the same amount of oil from the space. As the length of the topentant remains constant and the length of the arrow. due to the avoidance of the hydraulic cylinder increases, it causes straightening and decreasing range /.

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Turning the boom to the left or right is made possible by allowing the movable roller to follow the hydraulic cylinder. ie at the same time as oil is fed into space "A", approximately the same amount of oil from space "B" is emitted. As approaching the movable roller to the deflection roller mounted on the front end of the guide tube causes a double extension of the topenant relative to the extension of the boom, the boom is thus deflected / rotated / to the corresponding board.

The advantages of the proposed edge boom compared to the known hydraulic boom boom are. on the one hand, that instead of having two or three hydraulic cylinders, it allows the two movements - changing the range and turning, to be achieved with only one hydraulic cylinder, the same being integrated in the boom, and on the other, due to the application ia the forces of the torpedoes and the fastening at the ends, the boom is not loaded with bending moments.

Explanation of the annexed figures

The construction of the proposed double-tapered crane boom and hydraulic drive is illustrated by the accompanying figure.

Figure 1 is a schematic diagram of a double-tapered edge arm and hydraulic actuator, whereby the two movements (rotate and range change) are accomplished by means of a hydraulic cylinder mounted in the boom in which a fixed and movable piston is mounted.

Examples of hi embodiment of the invention

According to the exemplary embodiment shown in Figure 1, the double-tapered and hydraulically operated crane boom consists of a boom 1. attached to the mast and suspended to the saling 16 of two topenants. one of which is of constant length. The other topenate 5. which is of variable length is initially attached to the front end of the boom 1. and then passes through the mounting of the saling 16. deflection roller 14. continues through the deflection rollers 6 mounted on the guide tube 15. and covers the movable pull roller 8 and is engaged to the front end of the guide tube 6. A hydraulic cylinder 2 is mounted in the lower end of the boom 1 in which a fixed piston is mounted to the front end of hollow piston rod (4) secured to the mast. on which a movable hollow ball rod (9) is slid with a movable piston at the front and a movable withdrawal roller (8) mounted on its rear cock.

Using n toopciciinero

The use of double-tapered edge and hydraulic actuator boom is effective on ships and other means of transport. when it is necessary to perform

loading and unloading operations in the presence of a known mast slope (for example roll on ships) when a large torque is required to rotate the load. This moment exerts a great deal of pressure on the crowns and the small gear wheel of the rotary mechanism, so loading and unloading operations at angles exceeding 5 degrees are not allowed. The application of one or two hydraulic cylinders to rotate a mechanical boom gives it a lateral bending moment, which requires the necessary reinforcement and weights the construction. Also the application of one hydraulic boom integrated into the boom instead of two or three. it greatly facilitates the construction, which, because of its high positioning, is essential for the sustainability of ships and their value.

Implementation is the crane boom is a double hopper, and the hydraulic actuator for changing its range is achieved by feeding oil through the nozzle 3 into space., A '', while preventing volume change in space "B", ie. the movable piston is blocked together with its hollow piston rod 9 and the movable pull roll 8 attached thereto, while at the same time draining the same amount of oil from the space .. With the nozzle 7. Since the length of the topents 5 and 13 remains constant, and the length of the boom, due to the pushing of the hydraulic cylinder 2 increases, this causes it to straighten (decrease the range). Reversing the direction of the oil through the aforementioned nozzles causes the boom to be bent (increasing the range).

Turning the boom to the right is performed to allow the movable roller 8 to follow the hydraulic cylinder 2. i. at the same time is the supply of oil through the nozzle 3 in space "A" approximately the same amount of oil is emitted from the space .. B "through the nozzle 10. As the approach of the movable roller 8 to the deflecting roller 15. mounted on the front end of the guide tube 6 causes double extension of topenap 5 compared to the extension of the boom, resulting in boom deflecting / rotating / to the right. Reversing the oil direction through the aforementioned nozzles causes a left-hand rotation.

Claims (3)

1. Double crank and hydraulic drive crane boom including boom (1), mast (11), constant length hoist (13), saling (16), pendulum (17). driven through a cantileverly rotating upper block (18), a cut-in roller (19) ending with a hook (20), characterized in that a hydraulic cylinder (2) is fitted at the lower end of the boom (1) in which a fixed piston to the front end of a hollow piston rod (4) fixed to the mast. along which a movable hollow piston rod (9) slides, with a movable piston at the front and a movable withdrawal roller (8) mounted at its rear end. Crank boom with twin hoops and hydraulic actuator according to claim 1, characterized in that the variable length hoist (5) is fixed to the front end of the boom (1). and then passes through the deflection roller (1,4) mounted on the saling (16). proceeds through the deflection rollers (12) and (15) mounted on the guide tube (6), grips the movable pull roller (8) and is engaged to the front end of the guide tube (6). Crank boom with double topents and hydraulic actuator according to claim 1 and 2, characterized in that the nozzles (4) are fitted to the front and rear ends of the hydraulic cylinder (2) and to the rear cock of the hollow piston rod (4). 3). (7) and (10). through which the oil can be supplied / discharged / pressurized.