JPS5848476B2 - crane gantry - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gantry for supporting the boom of a crane.

Conventionally, a crane gantry is constructed by erecting a front member F and a rear member R on the top of a crane body A, and connecting the upper ends of both members F and R, as shown in Fig. 7. .

The boom supporting force by this gantry is determined by the height H of the gantry.
The higher the gantry height H, the more stable the gantry becomes, and especially in the case of a long boom, it is desirable to make the gantry height H as high as possible.

In order to increase the gantry height H, both the front and rear members F and R can be made longer as shown by the dotted line in Figure 7, but this will reduce the gantry's top angle α, making it difficult to stabilize the gantry itself. In addition to this, there was a problem in that the upper part of the gantry protruded significantly to the rear of the crane body when folded, causing problems in transportation of the crane, etc.

Also, move the front member F as much as possible to the crane body A.
Although the above-mentioned problem of the top angle α is solved by placing the gun at the front of the crane body, the problem of the gun IJ protruding to the rear of the crane body still remains.

For this reason, in the past, a mast gantry M was unavoidably used in the case of a long boom, but this was disadvantageous in various aspects such as assembly, disassembly, and transportation.

In view of the above points, the present invention aims to provide a crane gantry which can solve the problem of the gantry top angle and the problem of folding at once, and which can lengthen both the front and rear members. The precepts are as follows.

A feature of the present invention is that a front member consisting of an upper column and a lower column and a telescoping member are connected to each other at their upper ends so that they can be rotated in the front and rear directions at the top of both front and rear ends of the crane body. The upper and lower columns of the front member are connected via two types of pins along the left and right directions, and by removing one pin, the front member can be moved forward using the other pin as a fulcrum. A hydraulic cylinder is provided between the front member and the crane body for bending and extending the front member, and
The present invention consists in that a lock rod is provided which is removably installed between the bending point and the crane body in order to fix the bending point in position when the front member is in the above-mentioned halfway bent state.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a crane main body, 2 is a boom, 3 is a hanging hook, 4 is a wire for raising and lowering the hook, 5 is a guy cable, 6 is a wire for raising and lowering the boom, and 7 is a gantry according to the present invention.

This gantry 7 is constructed of a front member 8 and a carrier member 9, the front member 8 is in an inclined position in the front-back direction, and the rear member 9 is in a tenon vertical position, respectively, in the front-rear direction at the top of both the front and rear ends of the crane body 1. They are erected so as to be rotatable, and their upper ends are connected to each other by a gantry peak pin 10.

The front member 8 connects upper and lower pillars 11 and 12, each consisting of a pair of left and right pipes, so that it can be bent in the middle.

That is, as shown in FIGS. 2 and 3, brackets 13 and 14 are provided at the ends of the upper column 11 and the lower column 12 that are to be connected to each other, and the two brackets 13 and 14 are fitted together. The front member 8 is connected by left and right pins 15 and 16, and by removing one of the pins 15 and 16, the front member 8 can be bent into a U-shape.

The lower end of the lower column 12 is connected to the upper surface of the front end of the crane body 1 via mutual brackets 17 and 18 by a pin 19 so as to be rotatable in the front-rear direction.

Furthermore, a hydraulic cylinder 20 is installed between the lower part of the upper column 11 and the crane main body 1 so as to be able to swing in the front and rear directions.
The cylinder 20 allows the front member 8 to bend and extend.

21. 22 is a bracket for connecting this front member 8 and the hydraulic cylinder 20, 23 is the same pin, 24. 25
2 is a bracket for connecting the hydraulic cylinder 20 and the crane body 1, and 26 is a pin thereof.

On the other hand, the rear member 9 consists of a pair of left and right pillars, each of which has a plurality of pipes 27 whose diameters gradually become smaller.
The lower end of the lower end pipe 27 is connected to the rear end of the crane main body 1 by a pin 30 via a bracket 29. It is connected so that it can rotate freely in the front and rear directions.

Therefore, when folding this gantry 7, first remove one of the pins 15 and 16 connecting the upper column 11 and lower column 12 of the front member 8, and in this state, open the hydraulic cylinder 20. Activate.

In this way, when the piston rod 20a pushes the front member 8, the member 8 is moved across the pivot connection portion by the pin 16 of both the upper and lower columns 11, 12.
It falls forward while bending in the shape of a square, and at the same time, the rear member 9 is also pulled forward according to the movement of the front member 8.

When the hydraulic cylinder 20 is operated to its limit, it becomes the state shown in FIG.
A lock rod 32 is attached between the crane body 1 and a bracket 31 provided at the front end of the crane body 1, thereby fixing the bending point of the front member 8 in position.

Next, when the pins 28 connecting the pipes 29 of the rear member 9 are sequentially removed from the bottom and the piston rod 20a of the S hydraulic cylinder 20 is moved backward, the rear member 9 contracts while the front member 8 upper pillar 11
gantry 7 was pulled backwards, and finally this gantry 7
It is folded into the state shown in the figure.

In addition, in order to lock the rear member 9 in the contracted position in this folded state, a pin hole provided at the upper part of the pin connection part of the crane body 1 in the lower end pipe 27 and the connection between the other pipes 27... Insert the lock pin 34 across the pin hole 33.

Further, when using a crane, the operation of raising the gantry 7 is performed in the reverse order to the above-mentioned folding procedure.

According to this gantry I with such a configuration, it can be folded compactly by bending the front member 8 and reducing the rear member 9, and as shown in the figure, the gantry height H is equal to that of the crane body 1. Although it is longer than the full length, both members 8 and 9 can be sufficiently accommodated within the full length and height of the crane main body 1 when folded.

In other words, because it can be folded compactly as mentioned above,
Since both the front and rear members 8 and 9 are made long, the gantry height H can be made very high, and since the front member 8 is attached to the front end of the crane body 1, the top angle α can be made sufficiently large.

Therefore, the boom support state can be stabilized, and even in the case of a particularly long boom, a good support state can be obtained without the need to use a mast gantry in combination as in the past.

Note that the constituent material of the rear member 9 is not limited to a pipe, but may also be a strip plate, shaped steel, or the like.

As described above, according to the present invention, the front member erected at the front end of the crane body is configured to be bendable, and the rear member erected at the rear end of the crane body is configured to be extendable and retractable. When folding, the front member is bent and the rear member is reduced, allowing the entire gantry to be folded into a very compact size, which solves the folding problem and top angle problem caused by the lengthening of both members at once. .

Therefore, the gantry height can be made much higher than before and the boom support condition can be stabilized. Especially in the case of long booms, good boom support conditions can be achieved without the need to use a mast gantry as in the past. It is extremely useful in practice.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention, Figure 1 is a side view of the entire crane, Figure 2 is a partially enlarged side view of the gantry front member, and Figure 3 is Figure 2 1-1. 4 is a sectional view taken along the line IV-IV, FIG. 5 is a side view showing the state in the middle of folding, FIG. 6 is a side view showing the completed state of folding, and FIG. γ is a conventional example. FIG. 1...Crane body, 7...Gantry, 8...Front member, 9...-'J
Yamenha, 1 0... Pin for connecting both members, 11... Upper pillar of front member, 1
2...Lower column, 13, 14...Bracket for connecting both upper and lower columns, 15, 16...
...Two types of pins, 20...Hydraulic cylinder,
27... Pipes constituting the rear member, 28
...Pin for connecting each pipe, 32...
・Rotsukurotsudo.

Claims (1)

[Claims] 1. A front member consisting of an upper column and a lower column and a telescopic member are connected to each other at their upper ends and are erected at the upper part of both front and rear ends of the crane body so as to be freely rotatable in the front and rear direction. The upper and lower columns of the member are connected through two types of pins along the left and right directions, and by removing one pin, the front member is bent in the middle with the other pin as the fulcrum and facing forward. In addition, a hydraulic cylinder for bending and extending the front member is provided between the front member and the crane body, and the bending point is positioned in the middle bending state of the front member. A crane gantry comprising a locking rod that is removably installed between a bending point and a crane body for fixation.