JPH03216493A - Boom telescopic device of crane in cargo handling vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure of a telescoping boom of three or more stages in a cargo handling vehicle such as a mobile crane truck.

(Prior art) Fig. 7 is a side view of a conventional mobile crane vehicle in a running position, and Fig. 8 is a front view of a conventional mobile crane vehicle in a working position.
From the running posture shown in Figure 7. When the boom cylinder a is extended, the first boom b rotates upward around the foot pin C, and when the swivel frame e is rotated by 90 degrees around the rotation center line dd, it assumes the attitude shown in Figure 8. Further, when a boom extension/retraction device (not shown) is operated, the second boom f and the third boom g are extended/retracted.

h is the hook, j is the winch, and p is the amount of boom overhang from the vehicle body. q is the turning radius of the rear end when driving, r is the turning radius of the rear end when working, and S indicates obstacles such as walls. (Problem to be solved by the invention) In the above conventional mobile crane vehicle. In order to ensure stability during running, the foot pin C is installed at the rear of the vehicle body so that the boom overhang amount p from the vehicle body is small, but as a result, the winch J also needs to be moved rearward, so that the rear end during work is There was a major problem in that the turning radius r became large, making it difficult to work in narrow spaces.

Therefore, the inventor of this invention invented and proposed a new boom extension and retraction device shown in Figures 9 and 10 in order to solve the above problems. This new boom telescoping device will be explained in detail later (see Figs. 1 to 4).

However, when a conventional hose reel device is attached to this new boom extension device, the following major problems arise.

In other words, fil As shown in Figure 9, the boom rear end trajectory when the boom is raised and lowered is 6, and the hose V is in the second position.
To enter behind boom 6. Due to the rotation, the hose V gets caught on tree branches, which poses a safety problem.

(2) If the second boom 6 and subsequent parts protrude from the rear end of the first boom 2, the space for installing the first hose reel W is limited, so reduce the diameter of the hose reel or install the boom further upwards. The need will arise.

(3) Hose reel rollers A and B on the boom side
(respectively indicated by symbols x and y in FIG. 10) are required, making the structure complicated.

(Means and effects for solving the problem) This invention has been made to solve the above problems, and when the boom is retracted, the second boom protrudes from the rear of the first boom, and as the boom extends, the first boom A boom extension/retraction device in which the second and subsequent booms move forward from the rear end of the boom,
Oil is supplied to the telescopic cylinder connecting the boom and the third boom, with one end connected to the first boom. The other end is supplied by a hose attached to the telescopic cylinder of the second boom, and the hose passes through a hose sheave installed on the side of the second boom so as to freely roll around, and the hose sheave is One end is the first boom. By providing a hose reel device whose other end is elastically connected to a wire rope sheave through which the wire rope attached to the second boom is passed, it is perfectly compatible with the boom extension device and does not cause any problems. This is to prevent it from being derived.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of a mobile crane truck according to an embodiment of the present invention in a running position, and FIG. 2 is a front view of the same in a working position, from the running position shown in FIG. When the boom cylinder 1 is extended, the first boom 2 rotates upward about the foot pin 3. When the swivel base frame 5 is rotated 90 degrees about the rotation center line 4-4 and the boom telescoping device described later in FIGS. 3 and 4 is activated. Second boom6.
The third boom 7 is extended to take the position shown in FIG.

P is the amount of boom overhang from the vehicle body, Q is the turning radius of the rear end during traveling, and R is the turning radius of the rear end during work. The embodiments of this invention are characterized by the following three points.

That is, (1) the rear part of the second boom 6 (including the third boom 7 therein) is made smaller when the boom is retracted in the running position shown in FIG. 1 to reduce the boom overhang amount P from the vehicle body.

(2) The winch device 10 was installed on the first boom 2 in front of the rear end 21 of the first boom 2.

(3) When the boom is extended, I7tI2 after the first boom 2
The second boom 6 and the subsequent booms (third boom 7 in this embodiment) that had been protruding rearward from the front move forward,
Since the second boom rear part 6l moves to the position shown in Figure 2, the rear end turning radius R during work changes to the rear end turning radius Q during traveling.
Smaller. In other words, it is configured so that Q>R holds. This invention was made to enable a boom configuration having the above three features. The configuration and operation of the boom telescoping device will be explained with reference to FIGS. 3 and 4.

In the figure, one end of the telescopic cylinder l1 is attached to the second boom 6. The other end is attached to the third boom 7.

Hydraulic pressure for the telescopic cylinder l1 is supplied by a hose reel 12.

The hydraulic hose from the hose reel 12 is guided into the boom by a roller Bl3 attached to the second boom 6 and a roller A14 attached to the first boom 2. Figure 3 shows the case where the boom is extended, and the extension rope 15 is connected to the first boom 2.
2a of the third boom 7 and the third boom 7 through the extension sheave 16 attached to the second boom 6, when the telescopic cylinder 1l is extended, the third
When the boom 7 comes out of the second boom 6, the second boom 6 also comes out of the first boom.

When retracting the boom, attach the retraction rope 17 to point 2C of the first boom 2 and point 7d of the third boom 7.
By configuring this through the contraction sheave 18 attached to the second boom 6. When the telescopic cylinder 11 is retracted, the third boom 7 is retracted into the second boom 6. In the retracted state, the second boom 6 is lowered from the rear end of the first boom 2.
Ijin becomes prominent (see Figure 4).

Next, an embodiment of the hose reel device according to the present invention will be described with reference to FIGS. 5 and 6.

Figure 5 shows the telescopic device in its retracted state. Figure 6 shows the same extended state. In the figure, oil is supplied to the telescopic cylinder 11 that connects the second boom 6 and the third boom 7. One end is at the position indicated by the reference numeral 32 on the first boom 2, and the other end is indicated at the number 33 on the second boom 6. It is supplied by a hose 3l attached to the telescopic cylinder 11 at a position indicated by the reference numeral 331. The hose 31 is passed through a hose sheave 34 provided on the side of the second boom 2 so as to freely roll. Also, the wire rope 35. One end is at the position indicated by 36 on the first boom 2. The other end is attached to the second boom 6 at the position indicated by 37. It is arranged via a wire lobe sheave 38.
What are the hose sheave 34 and the wire rope sheave 38?
It is connected by an elastic joint 39 such as a cable or a spring, and rolls on a rail provided on the second boom side plate.

A hose 41 is connected to the piping of the vehicle body from a position indicated by reference numeral 32. In this way, the hose reel device shown in FIGS. 5-6 is perfectly compatible with the new boom telescoping device described in FIGS. 1-4. It does not cause any problems. (Effects of the invention) This invention is made as detailed above. A boom extension/retraction device for a crane that can increase the lifting height without increasing the amount of boom overhang when traveling, and also greatly improves workability in narrow spaces. This has the great effect of making it possible to realize a hose reel device that is completely compatible with the boom telescoping device.

[Brief explanation of drawings]

FIG. 1 is a side view of a mobile crane truck according to an embodiment of the present invention in a running position. Figure 2 is a front view in the same working posture, and Figure 3 is an explanatory diagram when the boom is extended and retracted using the boom extension device. Figure 4 is an explanatory diagram when the boom is retracted. Figures 5 and 6 are explanatory diagrams of the hose reel device with the telescoping device retracted and extended, Figure 7 is a side view of a conventional mobile crane vehicle in the running position, and Figure 8 is also in operation. Front view in posture. Figures 9 and 10 are a side view of a mobile crane in a running position and a front view of a mobile crane in a working position to explain the problems when a conventional hose reel is attached to a new boom telescoping device. ．． 1... Boom cylinder, 2... First boom 3.
...Boom foot pin, 6...Second boom, 7...
Third boom. 11... Telescopic cylinder, 12... Hose reel. 16... Extension sheave, l8... Contraction sheave, 31... Hose, 34... Hose sheave, 35... Wire rope, 38... Wire rope sheave, 39... Sheave Between joints.

Claims (1)

[Claims] In a crane system for a cargo handling vehicle that has three or more stages of telescoping booms and revolving frames, when the boom is retracted, the second boom protrudes from the rear of the first boom, and as the boom extends, the second and subsequent booms move from the rear end of the first boom. A boom telescoping device characterized by moving forward, the boom extending and retracting device having a second
Oil is supplied to the telescopic cylinder connecting the boom and the third boom by a hose that is attached to one end of the telescopic cylinder of the first boom and the other end of the telescopic cylinder of the second boom, and the hose is connected to the side of the second boom. The hose sheave is connected to a wire rope sheave, which is connected to a wire rope attached to the first boom at one end and the second boom at the other end. A boom telescoping device for a crane, characterized in that it is provided with an elastically coupled hose reel device.