JPS6022072Y2 - Telescopic boom crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telescopic boom type crane, and more particularly to the structure of the tip boom of such a telescopic boom type crane.

As shown in Fig. 1, a telescoping boom crane in which a telescoping boom crane device is mounted on a truck body C has been known for a long time, but this type of telescoping boom crane has recently become larger and larger. As a result, the head 5 of the tip boom 3 has become heavier.

By the way, this type of telescopic boom type crane is usually equipped with an auxiliary jib, and the auxiliary jib is used to lift relatively light objects to high places, or for high-lift/light-weight crane work (hereinafter referred to as auxiliary jib-specific work). However, when the telescopic boom type crane shown in FIG. 1 is used for this auxiliary jib-only work, the head 5 of the tip boom 3 is essentially unnecessary.

In other words, in the past, when the auxiliary jib was used exclusively for high-lift/light-weight crane work (the main pulley 8 of the tip boom head 5
Since the tip boom head 5 was still installed even if the auxiliary jib is not used, the tip boom head 5 acts as an element that increases the overturning moment of the crane, which reduces the lifting capacity and work range ( Lifting height and boom turning radius) were to be limited.

In particular, such a problem cannot be ignored in view of crane performance in recent large-scale cranes where the weight of the tip boom head 5 is increasing.

In view of the above-mentioned problems, the present invention divides the tip boom of a telescoping boom into a base on the proximal side and a head on the tip side, and when working exclusively for the auxiliary jib, the head is removed from the front of the base. The purpose of this invention is to provide a telescoping boom type crane that can expand the lifting capacity and work range during auxiliary jib-only work.

Hereinafter, the present invention will be explained based on the embodiment shown in FIGS. 2 to 7. FIG. A vehicle-mounted telescopic boom type crane B is shown.

The telescopic boom 1 is composed of a base end boom 2, a tip boom 3 that extends and contracts with respect to the base end boom 2, and an appropriate number of intermediate booms. The boom length can be adjusted accordingly.

The tip boom 3 is divided into a cylindrical base 4 on the proximal side and a head 5 on the tip side having a main lifting pulley 8. The portion 5 can be attached to the front of the base 4 or stored on the side of the base 4.

The specific structure of the boom 3 will be explained below. As shown in FIG. In addition, the head 5 is provided with a pair of upper and lower brackets 14, 14 and 1 on both sides 5a and 5a of the proximal end so as to correspond to the brackets 10.10 and 11.11.
5°15 is provided protrudingly.

Therefore, the base 4 and the head 5 of the tip boom 3 are arranged by fitting the brackets 10.10 and 11.11 on the base 4 to the brackets 14, 14 and 15, 15 on the head 5, and also overlapping each other. pin holes 40° in bracket 10.10, pin holes 44, 44 in bracket 14.14 and pin holes 41, 41 in bracket 11.11 and bracket 1
A strong connection can be achieved by fitting the connecting pins 30, 30 and 31, 31 into the pin holes 45, 45 of 5.15 (see Fig. 4).

On the other hand, a pair of upper and lower brackets 12, 12 and 13, 13 are provided protruding from both side surfaces 5b, 5b on the tip side of the head 5.

These brackets 12, 12 and 13, 13 are for attaching the auxiliary jib 6 to the front of the head 5, and the vertical distance between the brackets 12, 12 and 13, 13 and the brackets are 12.12 (in detail, the pin holes 42.42 of bracket 12.12 and the pin holes 43, 43 of bracket 13.13)
The horizontal distance between the brackets 10.10 and 11.11 is the same as that of the pair of upper and lower brackets 10.10 and 11.11 provided on the base 4.

Further, the auxiliary jib 6 has brackets 12, 12 and 1 provided at its base end 6a on both sides 5b, 5b of the tip side of the head 5.
A pair of upper and lower brackets 16.1 correspond to 3 and 13.
6 and 17, 17 are formed.

Therefore, the auxiliary jib 6 is attached to the brackets 12, 1 provided on the head 5.
Bracket 16.1 of auxiliary jib 6 on 2 and 13, 13
The pin hole 42.42 of the bracket 12.12 and the pin hole 46.46 of the bracket 16.16 and the bracket) 1
By fitting the connecting pins 32, 32 and 33, 33 into the pin holes 43, 43 of the bracket 17, 13 and the pin holes 47, 47 of the bracket 17, 17, respectively, it can be attached to the front of the head 5. If necessary, it can be similarly attached to the front of the base 4 (see FIGS. 5 and 7).

In addition, when the head 5 is attached to the front of the base 4 as shown in FIG. 6 and the connecting pins 31 and 31 on one side are removed, the head 5 rotates in an arc in the direction of arrow M about the connecting pin 30 and 30 on the other side. It can be moved and fixed to the side of the base boom 2 in a horizontally held state.

At this time, one side surface 2a of the base end boom 2 and the side surface 2a
The base end boom 2 supports the head 5 between the side faces 5C on one side of the head 5 corresponding to the base end boom 2, and a guide member for moving the head 5 further backward along the base end boom 2. A guide rail 20 is attached which acts as a guide rail.

The guide rail 20 includes a pair of upper and lower rails 21, 21 with a cross section of 1 shape, which are attached to the base end boom 2 parallel to each other and spaced apart appropriately, and a slider 22 with a T shape cross section with an appropriate length attached to the head 4. It is composed of.

The guide rail 20 has a front end plate 22a of the slider 22 fitted into a gap 23 formed by the rail 21.21 and the proximal boom side surface 2a so as to be slidable in the longitudinal direction. key surfaces 21a, 21
A and the front plate 22a of the slider 22 are brought together to restrict horizontal movement of the head 5 with respect to the base end boom 2.

Furthermore, the head 5 is changed from the above-mentioned state (see FIG. 6).
The head 5 can be separated from the base 4 and stored on the side of the base end boom 2 by removing the connecting pins 30, 30 connecting the base 4 and the base 4 (see FIG. 7). ).

Near the base end portions 21b, 21b of the rails 21.21 on the base end boom side surface 2a, there is a distal end side surface 5b of the head 5.
A pair of upper and lower brackets 18.18 are protruded so as to correspond to the pair of upper and lower brackets 12.12 provided on the head 5, and the brackets 12.18 of the head 5 are further attached to the brackets 18.18.
12 and further fit the connecting pins 34 and 34 into the pin holes 48 of the bracket 18 and the pin holes 42 of the bracket 12, which are overlapped with each other.
can be fixed to the side of the proximal boom 2.

Next, the use and operation of the telescoping boom type crane of the illustrated embodiment will be explained. This telescoping boom type crane separates the tip boom 3 into its base 4 and head 5, and can be connected or separated from each other. It is used by changing its mode as follows depending on the working condition.

First, during boom work, that is, when performing crane work using the main hook 7 (see Figure 2) attached to the head 5 of the tip boom 3, the head 5 and base 4 are connected as shown in Figure 4. The head 5 is used with the head 5 attached to the front surface of the base 4 by connecting them with connecting pins 30, 30 and 31, 31.

At this time, the auxiliary jib 6 is stored and fixed on the side of the base end boom 2.

Next, when performing jib work, that is, when performing crane work by attaching an auxiliary hook (not shown) to the auxiliary jib 6, there are two ways of use depending on the mounting position of the auxiliary jib 6.

First, in the first case, as shown in Fig. 5, the auxiliary jib 6
In the second case, the head 5 attached to the front of the base 4 is connected to the head 5 by connecting pins 32, 32 and 33, 33, and the second case is as shown in FIG. 5 is removed from the base 4 and stored on the side of the proximal end boom 2, and the auxiliary jib 6 is attached to the front of the base 4 and used (during work exclusively for the auxiliary jib).

In this latter case, the head 5 is connected to the connecting pins 34 and 34.
It is stored and fixed on the side of the base end boom 2 by.

In the former case, the length of the boom when extended is longer than in the latter case by the size of the head 5, so the working radius and hook lifting height during jib work increase, improving work efficiency. Since the head 5, which is comparatively extremely heavy, is fixed to the side of the base end boom 2, the overturning moment of the crane during jib work is significantly reduced compared to the former, and the lifting capacity of the crane itself is improved. , the former and the latter can be used depending on their own unique strengths.

In this embodiment, when moving the crane, from the state where the head 5 is attached to the front of the base 4 (as shown by the chain line 5') as shown in FIG. Either the head 5 is rotated in an arc to the side of the proximal boom 2, or the head 5 is removed from the connecting pins 30, 30 and further moved in the direction of arrow R, and the connecting pin 34 is moved as shown in FIG. .34, it is stored and fixed on the side of the proximal end boom 2 and is moved.

At this time, the auxiliary jib 6 is stored and fixed on the other side of the base end boom 2.

When the head 5 is removed from the front surface of the base 4 in this way, as shown in FIGS. 2 and 6, the total boom length L2 when the boom is stored is the same as the boom when the head 5 is glued to the front surface of the base 4. Length compared to total length.

can be made shorter. As a result, especially in a vehicle-mounted telescopic boom type crane as shown in the figure, when the vehicle is moving, the boom tip that protrudes in front of the vehicle body collides with the vehicle in front, or the boom tip protrudes in front of the vehicle body. Therefore, it is possible to improve the problem that the vehicle itself cannot turn easily and its maneuverability is not impaired.

In this regard, in the conventional example shown in FIG. 1, the head 5 of the tip boom 3 is fixed, so when the vehicle is moving, the head 5 protrudes largely forward of the vehicle body, preventing contact with the vehicle in front as described above. This includes the problem of not being able to maneuver around.

Conversely, if the boom length when the boom is retracted is one inch the same as that of the conventional telescopic boom type crane shown in Figure 1, the effective length of the boom when the boom is extended can be increased by that length. can.

Incidentally, the head 5 is stored on the side of the base end boom 2 in the following procedure.

That is, first, with the head 5 attached to the front of the head 5 as shown by the imaginary line 5' in FIG.
Pull out the appropriate length from the
．． 31, and the head 5 is rotated in an arc in the direction of arrow M about the other connecting pin 30, 30 so as to follow the side of the base 4.

Next, the rails 21, 21 of the guide rail 20 and the slider 22 are fitted together, and the distal end boom 3 is drawn into the proximal end boom 2 (the position shown by the solid line in FIG. 6).

In this state, the head 5 is held horizontally on the side of the proximal boom 2 by the connecting pins 30, 30 and the guide rail 20.

Furthermore, the connecting pin 30.30 is removed and the head 5 is further moved in the direction of the arrow R shown in the figure, and the distal end side bracket 12.12 of the head 5 and the bracket 18.18 of the proximal end boom 2 are connected to the connecting pin 34.34. The head 5 can be stored and fixed on the side of the proximal boom 2 by connecting with the base end boom 2 (see FIG. 7).

Next, to explain the effects of the present invention, according to the telescopic boom type crane of the present invention, the tip boom, which is extendable and retractable with respect to the proximal boom, is divided into a base on the proximal side and a head on the distal side. The head of the tip boom or the auxiliary jib can be selectively attached to the front of the base of the tip boom, so when the auxiliary jib is used exclusively for high-lift/light crane work, the head of the tip boom can be attached to the front of the base of the tip boom. This has the effect of reducing the overturning moment of the crane itself by the weight of the crane, and expanding the lifting capacity and work range during jib work.

In addition, in this invention, the head of the tip boom can be removed, so the overall length of the telescoping boom can be shortened when moving or storing a vehicle equipped with a crane.
There is also the effect that the driving performance (for example, the turning performance of the vehicle) of the vehicle can be improved accordingly.

[Brief explanation of the drawing]

Figure 1 is a side view of a crane equipped with a conventional telescopic boom type crane, Figure 2 is a side view of a telescopic boom type crane according to an embodiment of the present invention, and Figure 3 is a schematic diagram of the telescopic boom type crane shown in Figure 2. 4 to 7 are partially exploded perspective views, and FIGS. 4 to 7 are views of the telescopic boom type crane of FIG. 2 in use, and FIG. 8 is a view of the use of the telescopic boom type crane according to another embodiment of the present invention. 2... Proximal boom, 3... Tip boom, 4... Base of tip boom, 5... Head of tip boom, 8... ...Main pulley.

Claims (1)

[Scope of utility model registration request] A telescopic boom 1 having a base end boom 2 and a tip boom 3 that extends and retracts with respect to the base end boom 2 is mounted on a traveling vehicle body C, and in addition to the telescopic boom 1, there are additional parts attached to the telescopic boom 1. A telescopic boom type crane equipped with an auxiliary jib 6 used for lifting, the tip boom 3 is divided into a base end 4 and a head 5 on the tip side having a main pulley 8 for lifting. and the base 4 of the tip boom 3.
The head 5 of the tip boom 3 or the auxiliary jib 6 is attached to the front of the
A telescoping boom type crane characterized in that the crane is configured such that it can be selectively installed.