JPS6030296Y2 - crane - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jib crane used for ordinary crane work and pile driving work.

Jib cranes must always be used with the boom tilted forward at a certain angle or more to prevent the boom from flipping over.

Therefore, the suspended load cannot be brought extremely close to the crane body.

On the other hand, this jib crane may be used as a pile driver by attaching a so-called suspended league to the boom.

In this case, due to the above-mentioned limit on the boom elevation angle, the league will move away from the crane body, so the pile driving capacity will be lower than that of a so-called league-direct type pile driver in which the league is supported by a long stay. becomes.

That is, in the case of a league-directly connected pile driver, there is no restriction due to the boom, and the league can be brought close to the crane body to the limit of interference with the crane body, so the crane capacity can be used to its full capacity as pile driving capacity.

On the other hand, with a suspended league type pile driver that uses the boom as it is, even if the boom is raised to its maximum limit, the league position is further forward than in the league direct type, resulting in inferior stability. Unable to attach large pile hammer etc.
This resulted in poor pile driving ability.

However, in the case of a league-directly connected pile driver, it is economically disadvantageous because it uses an expensive stay, and it also has drawbacks such as troublesome assembly, disassembly, and switching between the pile driving position and the normal crane working position. Was.

Therefore, when this invention is used as a suspended league type pile driver, it can provide pile driving capacity comparable to that of a league direct type, and when used for normal crane work, it can achieve the original working radius and work load. Some provide cranes for use with capacity.

A feature of the present invention is that in a crane in which a boom foot mounting bracket is provided on the crane body, and the boom foot is pivotally attached to this bracket by a boom foot bin, the boom foot mounting bracket is attached to the crane body in a predetermined manner at the front and rear. At least two boom foot movement guide surfaces are provided at intervals, and the boom foot is provided with rolling wheels that can be moved forward and backward on the boom foot movement guide surfaces, and the boom foot is attached to the bracket. A means of transportation was provided to move between the two.

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

1 is a crane body; 2 is a boom; the lower end (boom foot) of the boom 2 is pivotally attached to the crane body 1 via a boom foot pin 3 so as to be freely rotatable back and forth; It's getting wet.

This boom foot attachment portion is shown in Figures 2 and 3.

The crane main body 1 is provided with a horizontal boom foot movement guide surface (hereinafter simply referred to as a movement guide surface) la over a predetermined length range in the front and rear direction at a portion where the boom foot 21 is attached, and this movement guide surface 1a There is a boom foot mounting bracket 11 for crane work, and a boom foot mounting bracket 1 for piling work is installed at a predetermined distance behind this bracket.
2 (hereinafter simply referred to as a front bracket and a rear bracket).

On the other hand, the boom foot 21 has bubbles 22.2 on both left and right sides.
2 are fixed together, and rolling rollers 23, 23 are rotatably mounted on both the bubs 22 and 22, respectively.

These rolling rollers 23, 23 allow the boom foot 21 to move back and forth on the movement guide surface 1a of the crane main body 1.

Both front and rear brackets 11 and 12 of the crane body 1,
The boom foot 21 is provided with a pin hole 1 law 12av 21a into which the foot pin 3 is inserted.

4 is a hydraulic cylinder for moving the boom, the cylinder case end is attached to the crane body 1, and the rod end is attached to the bubs 22 and 22 on both sides of the boom foot, and the boom foot 21 is moved back and forth by the telescoping operation of this cylinder 4. do.

However, when using it as a normal crane,
As shown in Figures 3 to 3, the boom foot 21 is attached to the front bracket 11 of the crane main body 1 by foot pins 3.

In this state, the crane can carry out lifting work with the same working radius and working capacity as conventional machines.

Next, when using this crane as a suspended leader type pile driver, first remove the foot pin 3 and press the hydraulic cylinder 4.
By reducing the boom foot 21, the boom foot 21 is pulled rearward and moved rearward by the rolling action of the rolling rollers 23, 23.

Then, as shown in FIGS. 4 and 5, at the position of the rear bracket 12, the same boom foot 21 is again attached to the foot pin 3.
Attach it to the crane body 1 by.

In this way, the mounting position of the boom foot 21 relative to the crane main body 1 can be moved rearward.

In this way, the upper end (front end) of the boom 2 can be removed from the crane main body 1.
The distance 1° to the crane is smaller than the distance 11 in the normal crane working position shown in FIG.

Therefore, if a suspended league type pile driver is constructed by attaching the leader 5 to the boom 2 in this boom attached state, the leader 5 can be brought closer to the crane body 1, making it impossible to move the conventional boom attachment position. The pile driving capacity can be increased compared to the suspended league type pile driver.

In FIG. 4, 6 is a stay for supporting the lower part of the leader, 7 is a pile hammer, and 8 is a pile.

Front and rear brackets 11.12 of crane body 1
The interval m (shown in Figure 2), that is, the rearward movement distance of the boom 2 when used as a pile driver, can be selected as appropriate, but it is possible to select it as far as the leader 2 and the crane main body 1 do not interfere with each other. The above distance m so as to approach the main body 1
Of course, it is also possible to take .

Therefore, according to this crane, it is possible to construct a pile driver that has a pile driving ability that is comparable to that of a direct-coupled leader type pile driver.

Also, when switching from a pile driver to a regular crane,
Change the mounting position of the boom foot 21 to the front bracket 11 again.
All you have to do is return it to .

In addition, the boom foot mounting bracket for pile driving work is
In practice, a sufficient effect can be obtained by simply providing the boom foot mounting bracket at the rear of the boom foot mounting bracket for crane work as described above, but it may be provided at two or more locations as necessary.

As mentioned above, the crane of the present invention is designed so that the mounting position of the boom foot relative to the crane body can be changed back and forth depending on whether it is used for normal crane work or piling work. It can be used with the same wide working radius and lifting capacity as the previous model, while increasing stability by bringing the leader closer to the crane body during pile driving, making it comparable to the league-direct type pile driver. This allows you to acquire the ability to drive piles.

In addition, the structure is simple and equipment costs are kept to a minimum, and the boom can be moved back and forth easily and smoothly using the boom foot movement guide surface on the crane body, the transfer roller attached to the boom foot, and the movement means. It has extremely high practical value.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Figure 1 is an overall side view of the crane working posture, Figure 2 is an enlarged side view of the boom foot attachment part, and Figure 3 is a sectional view taken along the line ■-■ in Figure 2. , Figure 4 is an overall side view of the pile driving position, and Figure 5 is a second view in the same position.
It is a figure equivalent figure. 1...Crane body, 1a/curve/boom foot movement guide surface, 2...Boom, 11...
Tool l, front bracket for foot installation, 12...
・Same rear bracket, 21...Boom foot,
23, 23... Rolling roller, 3... Boom foot pin, 4... Boom moving means (hydraulic cylinder), 5... Leader.

Claims (1)

[Scope of utility model registration request] In a crane in which a boom foot mounting bracket is provided on the crane body, and the boom foot is pivotally attached to the bracket by a boom foot pin, the boom foot mounting brackets are provided on the crane body at at least two locations at a predetermined distance in the front and back. A boom foot moving guide surface is provided, the boom foot is provided with a rolling wheel that can be moved forward and backward on the boom foot moving guide surface, and a moving means is provided for moving the boom foot between the brackets. A crane characterized by: