JPS5913440B2 - marine crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marine crane in which a boom is raised and lowered by one small cylinder.A conventional device for raising and lowering a boom is shown in FIG. There is a system in which a boom attached to the top of a post is directly supported by a cylinder b attached to the middle of the post, and the boom a is raised and lowered by the operation of the cylinder b.

However, this method requires a cylinder with a long stroke, and there is a risk of damage to the cylinder due to load swing during work.In addition, the load of the boom is directly applied to the cylinder, so special consideration must be given to buckling. The disadvantage is that the cylinder must be designed.

Conventionally, traversing rope trolley cranes equipped with traversing trolleys have also been commonly used, but there are few examples of such cranes that can change the boom angle. All of the traversing drums that simultaneously take in and unwind the traversing rope are installed on the boom, increasing the weight of the boom, installing a sheep to guide the hoisting rope and the traversing rope to the upper side of the boom, and increasing the weight of the traversing rope at both ends of the boom. There are still various problems that need to be improved, such as the problem that the attachment positions of the traversing rope and the hoisting sheave are different from each other.

The present invention was made with the aim of making it possible to raise and lower the boom with a small cylinder, and to be able to carry out cargo handling work over a wide range, and to reduce the weight of the boom. a boom is mounted so that it can be raised and lowered, a pair of short stays are rotatably pivoted on both sides of an intermediate position of the boom, and a portion of the short stay that is closer to the post than the pivot point on each short stay is pivoted to the post; The tips of the long stays attached so as to be tiltable are connected to each other, and a luffing cylinder with a rond tip connected to the part of the short stay located above the boom is attached to the pivot point between both ends of the long stay and the boom of the short stay. The long stay is installed on the boom so that it is extended to the maximum when it is almost in a straight line with the landing point, and by the extension of the undulation cylinder, both ends of the long stay and the pivot point at the intermediate position of the boom are made almost in a straight line. It is characterized by being able to hold the boom horizontally, and further supporting the traversing trolley on the boom so that it can traverse horizontally. The present invention is characterized in that the traversing drum of the traversing trolley is provided below the attachment side end of the boom.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 2 to 4 show an example of the present invention. 3 is rotatably attached with a vertical pin 4, and the end of a boom 5 is attached to the swing arm 3 with a horizontal pin 6 so that it can be raised and lowered, and the end of the boom 5 is pivoted on the bracket 2 with a hinge pin 7. Tip and above rotating arm 3
A swinging hydraulic cylinder 11 is installed on a cylinder mounting arm 10 which is connected to the upper surface of the cylinder via a link 9 and which is protruded from the top of the post 10 and extends in a direction perpendicular to the bracket 2. The tip of the piston rod 11 is connected to the tip of the lever 8, and the lever 8 rotates around the hinge pin 7 due to the expansion and contraction of the cylinder 11, and the boom 5 rotates together with the swing arm 3 via the link 9. be able to do so.

In addition, a bracket 12 is provided in the middle of the post 1 so as to protrude in the same direction as the bracket 2 at the top.
Two long stay fittings 13 are rotatably attached to the mounting fittings 13 using vertical pins 14, and the ends of the long stays 16 are attached to each of the fittings 13 so as to be tiltable using stay hinge pins 15, while the intermediate portion of the boom 5 To do this, short triangular stays 17 are arranged on both sides of the boom 50, and one ridge of each of the short stays 17 is rotatably attached to the boom 5 with a support pin 18, and the two short stays Centering around the mounting portion of each support pin 18 of the stay 17, one of the ridges is connected to the tip of the corresponding long stay 16 by a hinge pin 19, and the other ridges of both short stays 17 are connected to each other by a hinge pin 19. As shown in FIG. 4, the piston rond end of one hydraulic cylinder 21 for luffing, which is connected by a connecting beam 20 and installed on the upper surface of the boom 5, is pivoted to the connecting beam 20 by a pin 22, and the cylinder 21 is expanded and contracted. When activated, the short stays 17 on both sides can simultaneously rotate about the support pin 18, and when the boom 5 is in the horizontal working position, the cylinder 21 is at its maximum extension, and at this time. The center of the hinge pin 19 is made to be slightly lower than the straight line connecting the support point of the short stay 17, that is, the center of the support bin 18, and the support point of the end of the long stay 16, that is, the center of the stay hinge pin 15. When the cylinder 21 is shortened, the short stay 17 comes above the boom 5 and the boom 5 starts to fall down, and when the boom 5 falls down, the tip side of the long stay 16 comes to the upper part of the boom.

The boom 5 is provided with rails extending in the longitudinal direction at the bottom of both sides, and a sheave 24 for the hoisting rope is attached to the rails.
, 25, 26, and a hook block 2 on the sheave 26.
A traversing trolley 23 having a structure in which a trolley 7 is supported is supported so as to be able to traverse through wheels 28, and a traversing drum 29 is provided at the lower end of the boom 5, and a hoisting drum 30 is provided at the upper surface of the end of the boom 5. In addition, tip sheaves 31 and 32 are provided at the tip of the boom 5, one end of the traversing rope 33 wound around the traversing drum 29 is fixed to one end of the traversing trolley 23, and the other end is connected to the tip sheave 31 and then attached to the traversing trolley 23. The trolley 23 is fixed to the other end of the boom 5 so that the trolley 23 can move sideways to the tip and end of the boom 5 by rotating the drum 290. After hooking the sheave 35 and the tip sheave 32, the sheave 24, 26, and 25 of the traversing trolley 23 are hooked, and the terminal is fixed to the end of the boom, and as the hoisting drum 300 rotates, the hook block 27 moves up and down together with the sheave 26, and the suspended load is lifted. It will be possible to carry out deep-frying and wholesale.

Since the marine crane of the present invention is constructed as described above, when the boom 5 is in a horizontal state as shown by the solid line in the drawing, cargo handling work is performed using the traversing trolley 23.

The traversing drum 29 is rotated by the traversing winch, the traversing trolley 23 is moved to a predetermined position via the traversing rope 33 whose both ends are fixed to the traversing trolley 23, and then the hoisting winch is driven to hoist the traversing drum 29. The drum 30 is rotated, the hook block 27 is hoisted up and down via the hoisting rope 34, and the suspended load is lifted and unloaded.
3 to an appropriate position and carry out cargo handling work.

At this time, since the transverse drum 29 is provided below the end of the boom 5, compared to a configuration in which the transverse drum is installed on the top surface of the boom 5, the bending load acting on the boom is reduced, reducing the weight of the boom. The transverse rope 33 can be connected to the boom 5.
Since it is located on the lower side, the number of sheaves for guiding the rope to the upper side of the boom 5 can be reduced, and the position of the sheave for the traversing rope at the boom tip can be adjusted to the drum within the range of the fleet angle. Since it can be adjusted in the width direction, sheave placement becomes easy.

In the above work, by telescopically operating the swing cylinder 11 at the top of the post 10, the swing arm 3 is turned via the lever 8 and the link 9, and the boom 5 is horizontally turned 180 degrees or more in the left and right direction. By doing so, cargo handling work can be carried out efficiently over a wide range.

When a certain work is completed, the boom 5 is folded down and stored as shown by the two-dot chain line in FIG. 2. In this case, the procedure is as follows.

First, the traversing trolley 23 is moved to the end of the boom 5 and held fixed, and then one small cylinder 21 on the boom 5 is operated to shorten.

As a result, the center of the hinge pin 19 that pivotally connects the short stay 17 and the long stay 16 is moved from below the straight line connecting the center of the support pin 18 and the center of the stay hinge pin 15 to the upper side beyond the position (dead center) of the straight line. 2, the short stay 17 is rotated clockwise in FIG. 2 on both sides of the boom 5 due to the load of the boom 5.

At this time, the cylinder 21 receives a compressive force, but due to the slow contraction operation of the cylinder 21, the boom 5 gradually lies down and reaches the retracted position shown by the two-dot chain line in FIG.

At this time, in this embodiment, the short stay 17 has a shape in which the connecting part to the cylinder 21 is brought closer to the long stay 16 side, so that the piston rond tip of the cylinder 21 and the connecting beam 2
Since the pivot pin 22 with respect to the boom 5 is positioned close to the long stay 16 side, when the boom 5 is collapsed to the storage position, the short stay 17 can be positioned in a state protruding above the boom 5, and the long stay The tip of the stay 16 can be positioned above the boom 5, the tilting angle of the long stay 16 can be made small, and there is room above the stay hinge pin 15 at the end of the long stay 16. A driver's cab etc. can be placed there.

In addition, the short stays 17 on both sides of the boom are connected together by a connecting beam 20 at a position above the boom 5, so that they straddle the boom 5, so the number of cylinders 21 for hoisting can be reduced to one, and the equipment can be Significant cost savings can be achieved.

When the boom 5 is to be raised from the storage position to the horizontal working position for work again, the cylinder 21 is extended and the short stay 17 is rotated counterclockwise in FIG. 2 about the support pin 18. Raise the boom 5 via the long stay 16. The boom 5 is in a nearly horizontal position, and the center of the hinge pin 19 is aligned with the stay hinge pin 15.
The position of the straight line connecting the center of the support pin 18 and the center of the support pin 18 (dead center)
When the piston rod of the cylinder 21 slightly exceeds downward, the piston rod of the cylinder 21 receives a tensile force due to the counterclockwise rotational moment generated in the short stay 17 due to the load of the boom 5, and this tensile force is supported by the cylinder 21. As a result, the rotation of the short stay 170 is stopped, and the boom 5 is held horizontally.

When the boom 5 is raised to the working position, the work is performed by using the traversing trolley 23 and rotating the boom 5 as described above.

The above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment. For example, post 1
It is possible to attach two booms facing each other to the top of the post, and to perform work by installing two booms of the same size and rotating 180 degrees on one post using a similar turning mechanism and raising and lowering mechanism, and In the embodiment shown in FIGS. 2 and 4, it is also possible to install two hydraulic cylinders 21 on the boom 5 and connect them to each other without connecting the short stay 17 with the connecting beam 20. Of course, in the embodiment shown, the orientation of the respective hydraulic cylinders 21 may be reversed so that the cylinders 21 are most compressed when the boom 5 is in the horizontal working position, etc.

As described above, according to the marine crane of the present invention, (I) the luffing cylinder installed on the boom is installed in such a state that it is maximally extended when the long stay and short stay are almost in a straight line; Therefore, when the boom is in a horizontal working state, no compressive force is applied to the hoisting cylinder, ensuring safety. As a result, the stroke of the huffing cylinder can be shortened and the huffing cylinder can be made smaller, and the cylinder will not be damaged even by load swings. Since it is located above the boom, there is no need to install luffing cylinders on both sides of the boom, and one unit can be used, reducing equipment costs. Since it is located closer to the post than the stay pivot point, when the short stay is rotated and the boom collapses, the long stay will come to the top of the boom, creating more room below the end of the long stay. This is advantageous when placing a driver's cab, etc.

(2) Since the boom has a traversing trolley that can be traversed, and the boom can be rotated 180 degrees or more, cargo handling work can be carried out extremely efficiently over a wide range.

M Since the transverse drum is provided at the end of the boom, the overturning moment due to the boom's own weight can be reduced, and the weight of the boom can be reduced.

M Since the traversing drum is installed below the boom attachment part, the traversing rope can be positioned below the boom, which reduces the number of sheaves compared to the case where the traversing drum is installed on the top of the boom, and the traversing rope The mounting position of the sheave for the traversing rope at the tip of the boom can be shifted in the width direction of the traversing drum depending on the fleet angle.
Interference with the hoisting sheave at the tip of the boom can be avoided.

(b) Since the boom is raised and lowered by a separate mechanism from the boom rotation, it is not difficult to store the boom.

It can produce excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing an example of a conventional boom hoisting device, Fig. 2 is a side view showing an example of the marine crane of the present invention, Fig. 3 is an enlarged plan view from the direction of Fig. 2, and Fig. 4 The figure is an enlarged plan view taken from the direction {circle around (2)} in FIG. 2. DESCRIPTION OF SYMBOLS 1... Post, 2... Bracket, 3... Swivel arm, 5... Boom, 8... Lever, 9... Link, 11... Hydraulic cylinder for swing, 12...・Plat, 16... Long stay, 17... Short stay, 20... Connecting beam, 21... Hydraulic cylinder for undulation, 23... Traversing trolley, 29... Traversing drum, 30... Hoisting drum, 33... Traverse rope, 3
4...Hoisting rope.

Claims (1)

[Claims] 1. A boom is attached to the top of the post so that it can be rotated and raised,
A pair of short stays are rotatably attached to both sides of the intermediate position of the boom, and a long stay is rotatably and tiltably attached to the post at a portion closer to the post than the pivot point on each short stay. The ends of the long stay are connected to each other, and the undulating cylinder is connected with the end of the rond to the part of the short stay located above the boom. It is installed on the boom so that it is extended to the maximum when it is in the position, and by extension of the hoisting cylinder, the boom can be held horizontally by keeping both ends of the long stay and the pivot point at the intermediate position of the boom almost in a straight line. A marine crane characterized by: 2 A boom is attached to the top of the post so that it can swivel and raise and lower.
A pair of short stays are rotatably attached to both sides of the intermediate position of the boom, and a long stay is rotatably and tiltably attached to the post at a portion closer to the post than the pivot point on each short stay. The ends of the long stay are connected to each other, and the undulating cylinder is connected with the end of the rond to the part of the short stay located above the boom. It is installed on the boom so that it is extended to the maximum when it is in the position, and by extension of the hoisting cylinder, the boom can be held horizontally by keeping both ends of the long stay and the pivot point at the intermediate position of the boom almost in a straight line. A marine crane, further comprising a traversing trolley supported on the boom so as to be able to traverse laterally, and a traversing drum of the traversing trolley being provided below an attachment side end of the boom.