JPS6032071Y2 - vehicle type crane - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a vehicle type crane equipped with a jib boom.

[Technical background of the invention]

Some vehicle-type cranes are equipped with a jib boom.

This jib boom supplements the boom length of the main boom to expand the crane's working range and increase the lifting height of the lifted load.When not in use, this jib boom is stored along the main boom. It is sometimes used by extending out in front of the main boom.

By the way, the jib boom storage methods for vehicle-type cranes equipped with a jib boom are generally the so-called horizontal storage method, in which the jib boom is stored along the side of the main boom, and the so-called bottom storage method, in which the jib boom is stored along the bottom surface of the main boom. There is a holding method, but the horizontal holding method requires a large space for extending and retracting the jib boom, so the bottom holding method is said to be advantageous in this respect.

In other words, the jib boom is stored along the main boom with its base end facing the front end of the main boom. The main boom is extended in front of the main boom by locking the end to the tip of the main boom and rotating the jib boom around this base end. Therefore, the jib boom cannot be extended unless there is a space on the side of the main boom that is equal to or larger than the length of the jib boom, and therefore a large space is required for extending the jib boom.

This also applies when the jib boom extending in front of the main boom is rotated and stored on the side of the main boom.

In this regard, in the case of the lower holding method, since the jib boom is extended and retracted by rotating it vertically, no space is required on the sides of the main boom, so the jib boom can be extended even in narrow spaces. and storage.

On the other hand, in a vehicle-type crane, a hoisting cylinder for hoisting the main boom is placed directly below the main boom, and this hoisting cylinder is connected to the underside of the main boom, so that the main boom is hoisted by this single hoisting cylinder. , there is a system in which a hoisting cylinder is placed on both sides of the main boom, and these two hoisting cylinders are connected to both sides of the main boom, and the main boom is hoisted by these two hoisting cylinders. Those that use cylinders only need two cylinders to obtain the hoisting force of the main boom, so each cylinder may have a relatively small diameter, but the overall diameter is smaller than when using one hoisting cylinder. The cost is high, and since the two undulation cylinders have to be expanded and contracted in synchronization, the control system is also more complicated than when one undulation cylinder is used.

Therefore, as a vehicle-type crane, it is advantageous to connect a hoisting cylinder to the lower surface of the main boom and use this single hoisting cylinder to hoist the main boom.

[Problems with background technology]

However, in a vehicle-type crane that stores the jib boom along the underside of the main boom, when the hoisting cylinder is connected to the underside of the main boom, the storage space for the jib boom is expanded from the main boom's luffing cylinder connection part to the tip of the main boom. It will be limited to the side range,
This places restrictions on the length of the jib boom.

In other words, in a vehicle type crane in which the main boom is hoisted by two hoisting cylinders connected to both sides of the main boom,
Since there is no hoisting cylinder on the underside of the main boom, the jib boom stored under the main boom passes between the two hoisting cylinders and is stored under the main boom without interfering with the hoisting cylinder. In the case of a vehicle-type crane that has a luffing cylinder connected to the underside of the main boom, if the length of the jib boom is long, the tip of the jib boom will hit the luffing cylinder when storing the jib boom under the main boom. This luffing cylinder becomes a hindrance, making it impossible to store the jib boom.

For this reason, conventionally, the length of the jib boom has been limited to a length that prevents the tip of the jib boom from reaching the main boom's luffing cylinder connection part when stored under the main boom. Since the jib boom becomes shorter, the crane work range and the lifting height of the load cannot be increased very much when the jib boom is extended.

Note that if you move the connection position of the luffing cylinder to the main boom closer to the base end of the main boom, the jib boom can be made that much longer. If the main boom is brought closer to the pivot side, the moment acting on the hoisting cylinder during crane work increases, so the hoisting cylinder must be able to withstand this moment.

[Purpose of invention]

This idea was made in view of the above-mentioned circumstances, and its purpose is to connect a hoisting cylinder for hoisting the main boom to the underside of the main boom,
In addition, although the jib boom is stored along the bottom surface of the main boom, it is possible to store a jib boom whose length exceeds the main boom's luffing cylinder connection position. To provide a vehicle-type crane capable of increasing the length of a jib boom without moving a connection position closer to the base end side of a main boom.

[Summary of the idea]

That is, this invention enables the jib boom, which is stored along the lower surface of the main boom, to be separated near the main boom connection part of the luffing cylinder that is connected to the lower surface of the main boom and raises and lowers the main boom, and also allows the jib boom to be detached from the jib boom, which is stored along the lower surface of the main boom. The proximal end from the detached part is stored under the main boom, and the distal end from the detached part is stored along the luffing cylinder. The jib boom can be stored under the main boom.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

In the figure, 1 is a vehicle body of a vehicle-type crane, for example, a truck crane, and 2 . . . are wheels of the vehicle body 1.

The vehicle body 1 is provided with a driver's seat 3 for driving and outriggers 4 .

Further, a swivel base 5 that can rotate is provided on the vehicle body 1.

The swivel base 5 is provided with a driver's seat 6 for crane work, and a main boom 8 whose base end is pivotally supported on a pivot shaft 7.

This main boom 8 is extendable and retractable by a telescopic cylinder (not shown).

Further, on the swivel base 5, there is a unit directly below the main boom 8 that is connected to the lower surface of the main boom 8 and supports the main boom 8.
A book hoisting cylinder 9 is provided, and a main boom 8
is undulated by the expansion and contraction of this undulation cylinder 9.

Note that 10 is a pivot bracket that connects the luffing cylinder 9 and the main boom 8, and 9a is a foot pin.

Further, 11 is a main wire, 12 is a main hook, and the main wire 11 is wound and let out by a main winding winch (not shown).

A jib boom 13 is stored under the main boom 8, and a base end 13a of the jib boom 13 is removably pivoted to a pivot pin 14 provided at the tip 8a of the main boom 8.

This jib boom 13 is separated and stored near the main boom connection part of the hoisting cylinder 9, and its base end jib 15 and tip end jib 17 are connected when the jib boom 13 is extended and used. It is now considered to be one jib boom.

The proximal jib 15 of the jib boom 13 is stored and supported along the lower surface of the main boom 8 by a mounting bracket 16.16, and the distal end jib 17 is supported by the mounting bracket 16.
8.18, it is stored and supported along the lower surface of the undulation cylinder 9.

That is, the jib boom 13 is stored separately into a base end jib 15 and a distal end jib 17, as shown in FIG.

Further, connecting portions 17a, 15a are formed at the base of the distal side jib 17 and the distal end of the proximal side jib 15, respectively, and pin holes 19...
is formed.

These connecting parts 17a, 15a are for connecting the distal end side jib 15 and the base end side jib 17 when the jib boom 13 is used, and the fixing pins 20... are inserted into the pin holes 19... of the connecting parts 17a, 15a. These connecting parts 17a, 15
By connecting a, the distal end side jib 17 and the proximal end side jib 15 can be connected and fixed in a straight line.

Further, a tension rod 21 is provided on the proximal end side jib 15.

The tip 22 of this rod 21 is attached to be rotatable around a rotation pin 23, and the base 24 is adapted to be engaged with an engagement pin 25 provided at the top of the tip 8a of the main boom 8. It has become.

Note that 26°26 is a support bracket for the rod 21,
28.28 is a sheave that guides the auxiliary wire 29.

This auxiliary wire 29 is wound up and fed out by an auxiliary winch (not shown).

According to the above embodiment, when the jib boom 13 is stored, the jib boom 13 is moved between the distal side jib 17 and the proximal side jib 15.
These distal side jib 17 and proximal side jib 1
5 are housed and supported along the lower surfaces of the luffing cylinder 8 and the main boom 8, the length of the jib boom 13 is not restricted by the main boom connection position of the luffing cylinder 9, and therefore the jib boom 12 Since the length of the main boom 8 can be made longer than the connecting position of the undulating cylinder of the main boom 8, the range of work of the crane can be further expanded, and the lifting height of the suspended load can be further increased.

In addition, since the jib boom 13 is detached and stored, the length of the jib boom 13 can be secured sufficiently, and the main boom connection position of the luffing cylinder 9 can be separated from the base end of the main boom 8, making it possible to perform crane work. The moment acting on this undulation cylinder 9 can be reduced at times.

Also, when stored, the jib boom 13 is separated into the proximal jib 15 and the distal jib 17, so the distal jib 17
is always stored along the lower surface of the luffing cylinder 9 regardless of the luffing angle of the main boom 8.

For this reason, as shown in the imaginary line in Figure 2, when the main boom 8 is erected and crane work is carried out, the main boom 8 is
Since the bosom can be made wider, this tip side jib 17 does not become an obstacle during crane work.

Furthermore, since the tip side jib 17 of the jib boom 13 is stored on the lower surface side of the luffing cylinder 9, the center of gravity of the vehicle type crane can be lowered by the weight of the tip side jib 17. There is also the advantage that the jib boom 13 can protect the hoisting cylinder 9 and various valves and piping.

In addition, when using the jib boom 13, the main boom is erected so that the proximal side jib 15 supported by the main boom 8 and the distal side jib 17 supported by the luffing cylinder 9 are in a straight line. In this state, connect the connecting parts 17a and 15a of the distal side jib 17 and the proximal side jib 15 with the fixing pin 2.
0... to connect and fix the distal end jib 17 and proximal jib 15. After that, as shown in FIG. It is only necessary to engage the engagement pin 27.

Note that 14a is a fixing pin that fixes the base end 13a of the jib boom 13 to the pivot pin 14.

Note that this invention is not limited to the above embodiments.

For example, the mounting bracket 18.18 for storing and supporting the tip side jib 17 along the lower surface of the luffing cylinder 9 does not necessarily need to be provided on the luffing cylinder 9, and the mounting bracket 18 may be provided on the pivot bracket 10 of the luffing cylinder 9. good.

Furthermore, in the above embodiment, the main boom connecting position of the hoisting cylinder 9 is relatively close to the tip side of the main boom 8 as shown in FIG. The position may be in the vicinity of right above the foot pin 9a in the maximum tilted state.

[Effect of idea]

This invention allows the jib boom, which is stored along the bottom surface of the main boom, to be separated near the main boom connection part of the luffing cylinder that is connected to the bottom surface of the main boom and raises and lowers the main boom. The proximal end from the section is supported by the main boom, and the distal end from the detached section is supported by the undulating cylinder.
According to this invention, a jib boom whose length exceeds the connecting position of the main boom's hoisting cylinder can be stored under the main boom. Although the jib boom is stored along the lower surface of the main boom, the length of the jib boom can be increased without moving the connection position of the luffing cylinder to the main boom closer to the base end side of the main boom.

Moreover, according to this invention, the tip side of the jib boom is stored along the luffing cylinder, which lowers the center of gravity of the vehicle type crane when the jib boom is stored, thereby improving stability. It also has the effect of being able to.

[Brief explanation of drawings]

The drawings show one embodiment of this invention; Fig. 1 is a side view of a vehicle-type crane, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is an explanatory diagram showing when the jib boom is used. . Death...Main boom, 9...Luffing cylinder, 13...Jib boom.

Claims (1)

[Scope of utility model registration request] an extendable main boom; a hoisting cylinder connected to the lower surface of the main boom to hoist the main boom;
It is stored along the underside of the main boom with the base end facing the base end of the main boom, and when in use, it is rotated around the base end and placed in front of the main boom. In a vehicle-type crane equipped with an extended jib boom, the jib boom is bendable near the main boom connecting portion of the hoisting cylinder, and the proximal end of the jib boom is placed below the main boom from the bent portion. A vehicle-type crane, characterized in that the crane is retracted, and the tip side from the bending portion is retracted along the undulation cylinder.