JPS58144093A - Stretcher for multistage boom - 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 The present invention relates to a telescoping device for a multi-stage boom such as a crane, in which the multi-stage boom can be telescopically operated in a predetermined order.

Generally, multi-stage booms are used for cranes, etc.
The multi-stage boom is preferably operated sequentially according to a fixed order. For this purpose, devices that hydraulically control sequential operation have been used, but they have the drawback of not only being unable to maintain sequential operation if abnormally high pressure is generated due to frictional resistance, but also being expensive overall. .

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a multi-stage boom extension/retraction device that can reliably perform sequential extension/retraction operations of the multi-stage boom with an extremely simple configuration.

To explain the first embodiment of the present invention with reference to the drawings, as shown in FIG. 21-
a sixth boom 6 that slides within the second boom 2 and extends and contracts with respect to the second boom 2; and a fourth boom 6 that slides within the sixth boom 3 and extends and contracts with respect to the sixth boom 6. A double-acting hydraulic cylinder 5 is installed at the inner base of the first boom 1.
(1:! Hereinafter referred to as multi-stage cylinder) The piston lower drawer tip is pivoted 6゜, and the hydraulic cylinder 5
The tip of the cylinder main body Z is pivoted 7' to the inner base of the second boom 2 together with the base of the main body 9 of a multi-attack double-acting hydraulic cylinder 8 (hereinafter referred to as a multi-stage cylinder).

On the other hand, the base of the main body 9 of the multi-stage cylinder 8 is pivotally supported 7' together with the main body 7 of the hydraulic cylinder 5 at the inner base of the second boom as described above. A first cylinder 10 that is extendable and retractable relative to the first cylinder 10, and a second cylinder 11 that is extendable and retractable relative to the first cylinder 10.
The tip of the second cylinder 11 is the fourth cylinder.
A connecting rod 12 is provided between the tip of the first cylinder 10 of the multi-stage cylinder 8 and the base of the sixth boom 3.
The base of the main body 7 of the hydraulic cylinder 5 and the front end of the main body 9 of the multi-stage cylinder are supported by a connecting member 16 having a sliding portion with the T44 poom 4 inward at the lower end.

The aforementioned hydraulic cylinder 5, multistage cylinder 8, and connecting rod 12 constitute a hydraulic drive device.

By the way, as described later, the second boom 2 base and the sixth
Cam devices 1114 and 14 are provided at the base of the boom 6, and matching rollers and locking rollers are arranged on each boom of the multi-stage boom in correspondence with the cam devices 14 and 14. The hydraulic circuit of the above-mentioned hydraulic cylinder 5 and multi-stage cylinder 8 will be explained with reference to FIG. Conduit 17 communicating with
and is drilled.

On the other hand, the aforementioned piston side oil chamber 14 and the main body piston side oil chamber 18 of the multi-stage cylinder 8 are connected via a communication pipe 19, and further via a communication passage 20 bored in the piston of the first cylinder 10. Piston side oil chamber 21 of the first cylinder 10
is communicated with.

22 via a communication pipe line 23, and further communicates with the piston red oil chamber 25 of the first cylinder 10 via a communication passage 24 bored in the piston rod of the first cylinder 10.

That is, pressure oil from a hydraulic pump (not shown) is simultaneously supplied to the extension side oil chamber or narrow side oil chamber of the hydraulic cylinder 5 and the multistage cylinder 8. A cam mount [14, 14] is installed on the earthen wall at the base of the boom 6.
This cam device 14.14A will be explained with reference to FIG. In addition, since both the cam devices 14 and 14A provided in the 21st and 6th booms 2 and 6 have the same structure, the cam device 14 provided in the 2nd boom 2 will be explained.

A base plate 2' is fixed to the upper wall of the base of the boom 2, a pair of guides 26.26' are fixed to the base plate 2', and a shaft 27.27' is inserted into the guides 26.26'. Guide 26.
It is inserted slightly beyond the upper and lower ends of 26.
And on this shaft 27.27' there is also a locking arm 29.29' which has a locking part 28.28' on the one hand and on the other hand on its upper part.
．． Abutment arms 50 and 30' are respectively fixed to the mounting side opposite to the substrate 29'. On the other hand, there are strips F and pads 51 and 31 at appropriate locations on the inner surface and outer surface of the substrate 2'.
The locking arms 29, 29 are fixed to each other, and are biased by springs 32, 327 (FIGS. 4 and 5) that are fixed to the ends of the locking arms 29, 29' and the base plate 2'. ' and the abutment arm 30.30' are restricted from rotating clockwise relative to the guide 26.26'.

By the way, the outer surface base of the upper wall of the sixth boom 6 and the first boom A
1. At the tip of the inner surface of the upper wall, there are locking rollers 53, 53 that can be engaged with the locking portions 28, 28' of the locking arm 29, 29' mentioned above.
' are fixed to the inner tip of the upper wall of the first boom 1 and the outer base of the upper wall of the sixth boom 6, and abutment rollers 54, 54' that can come into contact with the aforesaid abutment arms 30 and 30' are provided. is fixed (Figure 4). Therefore, when the multi-stage boom is in the contracted state as shown in FIG.
2' against the abutting arm 60' and the locking arm 29'.
In addition to being rotated counterclockwise, the locking roller 63 is engaged with the locking 1s28 of the locking arm 29.

Next, operation 1 of the embodiment of the present invention will be explained. When the multi-stage boom is in the contracted state, a hydraulic pump (not shown) is operated and pressure oil is introduced into the pipe line 15. It reaches the side oil chamber and passes through the communication pipe 19' to the main piston side oil chamber 18 of the multi-stage cylinder 8 and the piston side oil chamber 21 of the first cylinder 10 via the communication passage 20.
The piston loader reaches the first cylinder 10. The entire second cylinder 11 can be extended.

At this time, the cam device 14 provided at the base of the second boom 2 releases the engagement and binding between the first and second booms 1 and 2, while the second boom 2 and the 61st boom are engaged. has been done. That is, as shown in FIG. 4, the locking arm 29 and the locking roller 63 are connected to the locking portion 2 of the locking arm 29
8, the expansion of the sixth pool 6 is prevented.

Similarly, the cam device 14A provided at the base of the sixth boom 6 releases the connection between the 21st boom 2 and the sixth boom 6, and the sixth boom 3 and the fourth boom 4 are engaged and secured. There is.

Therefore, the hydraulic cylinder 5 is first extended, and the second boom 2 is extended with respect to the 111 poom 1.

When the second l-A2 is fully extended, the abutting arm 30 contacts the abutting roller 34- and rotates counterclockwise against the spring 32, and at the same time, the locking portion 28 of the locking arm 29'
' is the locking roller 3! It faces J'.

As the abutting arm 60 moves, the locking portion 28 of the locking arm 29 is simultaneously released from the locking haze 33, so that the sixth boom 3 is unlocked. Therefore, although the first cylinder 10 of the multi-stage cylinder 8 extends from the main body 9, the I
F! Since the first cylinder 10 and the sixth boom 6 are connected by the connecting rod 12, the sixth boom 3 is extended.
When the third bar 5 extends, the locking roller 6! Since the abutting roller 64' moves, the abutting arm 36' and the locking arm 29' return clockwise due to the urging force of the spring 329, and as a result, the locking arm 29' moves against the locking roller 63. 112 boom 2 and the first poom 1 are secured by engaging ' (815) O! 113 With the expansion of Poom 3, #! 6 Cam device 14 provided at the base of the poom 6
When the II6 poom 6 is fully extended, the fourth boom 4 and the sixth boom 3 are moved as in the case of the cam device 14 described above.
The guarantee will be canceled. Therefore, the multistage cylinder 8
The second cylinder 11 is extended from the first cylinder 10, and the fourth boom 4 is extended. When the fourth boom 4 extends, the second boom 2 and the third boom 3 are engaged and secured.

Also, when retracting the multi-stage boom from its most extended state, the first poom 1 and the second poom 2 are tied together, and #!
2 poom 2 and lI3 poom 6 are tied together, and the 41st-A
4 has been released, by supplying pressure oil to the pipe 17, the second cylinder 11 is first contracted, and the I
Retract the I4 boom 4 into the third boom 3. Then,
Contrary to the above, the three pools 6 are sequentially contracted into the second pool 2, and then the second boom is contracted into the first boom.

Next, the configuration of the second embodiment of the present invention will be explained with reference to Figures 6 and 7. At the base of the first boom 1, there is a multi-stage Il# hydraulic cylinder. The base of the main body 35 of Q (hereinafter referred to as a multi-stage cylinder) is pivoted 65', and the multi-stage cylinder, fO, includes a main body 35, a first cylinder 36 that is telescopic with respect to the main body 35, and a first cylinder 36 that is extendable and retractable with respect to the main body 35. Flexible for 66! It is composed of a 112 cylinder 37 and a sixth cylinder 38 that is extendable and retractable with respect to the second cylinder 37, and the tip of the fifth cylinder 68 is pivoted 68' to the tip of 14 plumb 4. There is.

In addition, connecting rods 39.40 are provided between the tip of the l111 cylinder 66 and the base of the second boom 2 of the multi-stage cylinder IQ, and between the tip of the second cylinder 37 and the base of the sixth boom 3. The tip of the second cylinder 67 has a fourth cylinder at the lower end.
It is supported by a connecting member 41 provided with a front portion that connects to the inner surface of the boom 4.

A hydraulic drive device is constituted by the aforementioned multi-stage cylinder tq1 connecting rod 59.40.

Further, the hydraulic circuit of the multi-stage cylinder tIJ will be explained with reference to FIG. Communication path 46
to the piston side oil chamber 44, and further to the second cylinder 6.
It communicates with a piston-side oil chamber 46 through a communication passage 45 bored in the piston No. 7. Further, the pressure oil supplied to the piston rod side oil chamber 47 of the main body 65 passes through a communication passage 48 bored in the piston rod of the first cylinder, and is further transferred to the piston rod side oil lI49 of the second cylinder 3.
It communicates with the oil chamber 51 on the C piston rod side through a communication passage 50 bored in the piston rod No. 7. That is, pressure oil from a hydraulic pump (not shown) is simultaneously supplied to the extension side oil chamber or the contraction side oil chamber of the multistage cylinder 34.

In addition, regarding the cam constants 14, 14 provided at the base of the second boom 2 and the base of the sixth boom 3, respectively, and having an abutting arm and a locking arm, and the abutting roller and the locking roller provided on each boom, Since this is the same as the first embodiment described above, detailed explanation will be omitted.

As described above, the present invention installs a cam device having a locking arm and a balance arm on the second and sixth booms, and arranges an abutting roller and a retaining roller on each boom of a multi-stage boom. A hydraulic drive including at least a multi-stage dynamic hydraulic cylinder is disposed between each boom of the multi-stage boom, which allows the height of each boom to be reduced marginally and also ensures that the multi-stage booms are arranged in a fixed order. 041, Brief Description of the Drawings The drawings show an embodiment of the present invention, and Figure 1 is a simplified illustration of the entire multi-stage boom of the first embodiment. 2 is a hydraulic circuit diagram, 3 WJ (aXb) is an enlarged plan view and side view showing the cam device installed in the intermediate boom, 4
Figure 165 is a partial plan view showing the second boom in its extended state; Figure 6 is a cross section 4IIW schematically showing the entire multistage boom of the second embodiment.
o figure, #! Figure 7 shows the hydraulic circuit diagram.0 1...First boom, 2...Second boom, 6...
... 6th boom, 4... 4th boom, 5... multiple # hydraulic cylinder, 8. Iku Q...Multiple-acting double-acting hydraulic cylinder, 1'4. L4...Cam device, 29.29'
... Locking arm, 60.30'... Collision arm, 33.33'... Locking roller, 34.34'...
...Balancing roller.

Claims (4)

[Claims] (1) A multi-stage boom is configured by sequentially slidably inserting a second boom into the first boom, a sixth boom into the second boom, and a fourth boom into the third boom, and the multi-stage boom A hydraulic drive device including at least a multi-stage double-acting hydraulic cylinder is disposed between the booms of the multi-stage boom so that each boom of the multi-stage boom can be expanded and contracted, and a locking arm is provided at the base of each of the second boom and the third pump. A cam device consisting of an abutting arm is installed, and the abutting roller that comes into contact with the abutting arm of the cam device and the locking roller that can be freely engaged and detached by the locking arm are arranged in multiple stages corresponding to the arms of the cam device. A multi-stage boom extension/retraction device installed on each boom. (2) The hydraulic drive device (m) includes a double-acting hydraulic cylinder disposed between the first boom and the second boom, and a multi-stage double-acting hydraulic cylinder disposed between the second boom and the fourth boom. The multi-stage boom telescoping device according to claim 1, comprising a hydraulic cylinder and a connecting rod disposed between the first cylinder and the third boom of the multi-stage double-acting hydraulic cylinder. (3) The Wm period hydraulic drive device includes a multi-stage double-acting hydraulic cylinder disposed between a first boom and a fourth boom, and between the first cylinder and second boom of the multi-stage double-acting hydraulic cylinder, and a connecting rod disposed between the second cylinder and the sixth boom, respectively. (4) Connect the tip of the cylinder body of the IJ hydraulic cylinder and the base of the cylinder body of the multi-stage double-acting hydraulic cylinder to ts2.
The multi-stage boom telescoping device according to claim 1, which is pivotally connected to the pool base.