JPS60242197A - Boom expander in 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 boom telescoping device in a multi-stage boom.

(Conventional Technique Wi) Cranes and the like are generally equipped with a multi-stage boom with a 2[lN1 first-reduction mechanism, and a hydraulic cylinder is used for the first shift of extension and contraction.

By the way, in such a multi-stage boom, if one hydraulic cylinder corresponds to one boom, m
The stage boom requires (m-1) hydraulic cylinders, and a large number of hydraulic cylinders must be disposed within the boom, which poses a problem in that the degree of freedom in design is limited.

For this reason, when extending and retracting the leading boom, the telescopic cylinder for extending and retracting the leading boom is made fragile and the leading boom is extended and retracted using the telescopic cylinder of the second boom into which the leading boom is slidably inserted. It has been known.

However, with such conventional technology, the first pump is #wJ
Because of this, the second boom may move with the first boom due to friction when the first boom is extended, and this tendency is even more pronounced when the multi-stage boom is in a hooked state.

(Problem to be solved by the present invention) The invention was made in view of the above-mentioned problems, and the purpose is to reliably prevent simultaneous extension of the second boom due to friction when the first boom is extended. It is.

(Technical means to solve the problem) The invention is to form a bottle hole in the first boom, the second boom and the connecting member in a continuous six-stage boom including the first boom, A locking part is formed on the sixth boom, and when the first boom is extended, the lashing pin is transferred from the bottle hole to the locking part and the second boom is extended.
A 1cfll was constructed to connect the boom to the sixth boom.

(Embodiment) Below, an embodiment of the invention will be explained based on the drawings. 1 shows the entire multi-stage boom, and 6.
It consists of a tiered boom.

In other words, the multi-throw boom 1 includes a base boom, an intermediate boom 6 inserted into the base boom in a sliding groove, and a tip boom 4 inserted into the intermediate boom 6 in a sliding groove. It is composed of

Reference numeral 5 denotes a hydraulic cylinder disposed within the multistage boom 1, the base end of which is pivotally supported by the base boom 2, and a connecting member 7 of an appropriate length extending from the lower end of the hydraulic cylinder.

At the tip of this connecting member 7, there is a bottle hole 10 that matches the pin holes 8 and 9 drilled at the tip of the intermediate boom δ and the front boom 40.
Usually, the connecting member 7 is connected to the base boom 4 and the intermediate boom 6 by inserting a lashing bin 11.

10,000, the tip poom 4 is equipped with a boom head 12 or a stop layer,
Align the insertion hole drilled there with the stop layer bolt 16.
It is secured by.

Further, when the boom head 12 and the boom 4 are secured with the stop bolts 16, the insertion holes 14 are drilled in the opposite direction.
．． 15, and the rough insertion holes 14 and 15 match the bottle holes 16 drilled in the connecting member 7, so that the lashing pins 11 can be inserted. There is.

By the way, as will be described later, a locking device 17 is provided on the base boom 2 and the intermediate boom 6 in order to prevent the intermediate boom 6 from extending simultaneously when the front boom 4 is extended.

This locking device 17 is connected to a bottle hole 19 of a projecting piece 18 provided on the base boom 2 and a bottle hole 21 of a tip member 20 of the intermediate boom B.
The lashing bottle 11 can be inserted into the lashing bottle 11.

In addition, the stopper 26 is fixed to the tip of the tip poom 4.
is a pin hole drilled in the base of the front boom 4, and when the front boom 4 is extended, the pin hole 10 of the connecting member 7 and the intermediate boom 6 is opened.
, 8 so that the lashing bottle 11 can be inserted.

Further, 24 and 25 are guide pieces and butts that are attached to the connecting member 7.

Next, the operation of the present invention will be explained. When the multi-stage boom 1 is retracted, the pin 11 is normally inserted into the pin hole 10 of the connecting member 7.
It is inserted into the bottle hole 8 of the intermediate boom 6 and the bottle hole 9 of the tip boom 4, and locks the champion together.

Therefore, if a two-stage boom is required, extend the hydraulic cylinder 5 in this state and move the intermediate boom 6 to the base boom 2 while keeping the first boom 4 in the intermediate boom 6 in the small state. When the intermediate boom 6 is extended and then the hydraulic cylinder 5 is contracted, the intermediate boom 6 is contracted to the handle poom 2.

If a 6-stage boom is required, the lashing bin 11
is pulled out from the bottle hole I Ll, 9.8 and inserted into the bottle hole 19 of the projecting piece 1B and the bottle hole 21 of the tip member 20, and the intermediate boom 6 is fixed to the base boom 2.

Thereafter, when the hydraulic cylinder 5 is extended, the connecting member 7 comes into contact with the stopper 22 and extends the front boom 4 with respect to the intermediate boom B (see FIG. 6(a)).

When the front boom 4 is fully extended, the hydraulic cylinder 5 is contracted, and only the hydraulic cylinder 5 is contracted while the front boom 4 is maintained in the extended state jlK. When the hydraulic cylinder 5 is contracted to the maximum, the bottle hole 10 of the connecting member 7 and the bottle hole 8 of the intermediate boom 3 are opened.
and the bottle hole 26 of the tip boom 4, so the lashing bottle 11 inserted into the bottle hole 19.21 is pulled out and inserted into the bottle hole 10°8, 26 (see Fig. 6(b)). .

Therefore, since the tip boom 4 is fixed in an extended state with respect to the intermediate boom B, if the hydraulic cylinder 5 is then extended, the intermediate boom 6 will be extended further than the base boom 2 (the sixth
(See figure (o)).

When the crane work is completed, the hydraulic cylinder 5t is reduced, the intermediate boom 6 is stored in the base boom 2, and the lashing pin 1 is
1 into the bottle hole 19.21.

Next, after extending the hydraulic cylinder 5 and bringing the connecting member 7 into contact with the strike bar 22, the lashing bottle 11 is inserted into the pin hole 1.
6, 15, and 14 and contracting the hydraulic cylinder 5, the tip boom 4 is stored in the intermediate boom 6. After this, the lashing bottle 11 is transferred to the bottle hole 10, 9.8, and becomes a running position.

In this example, the multi-stage boom consisted of a six-stage boom consisting of a base boom, an intermediate boom, and a front boom, but even if the multi-stage boom has four or more stages, there are six consecutive booms including the front boom. Applicable to booms.

(Effects of the invention) As described above, in the invention, since a single lashing bottle is selectively inserted into the bottle hole, operation is ensured, and
When the tip boom is extended, the second boom is slidably inserted into the tip boom.
It is possible to reliably prevent the boom from extending at four o'clock.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the invention, and FIG. 1 is a longitudinal sectional view of a multi-stage boom, FIG. 2 is an exploded sectional view of the main parts of the boom, and FIG. 6 (a) (b) (0) FIG. 2 is an explanatory diagram showing the decompression procedure. 1... Multi-stage boom, 2... Base boom (6th boom), 6... Intermediate boom (2nd boom), 4...
... Tip boom, 5 - Hydraulic cylinder, 7... Connection member, 8.9, 10, 14, 15, 16, 19. Soto・
... Bottle hole, 11 ... Lashing pin applicant ShinMaywa Industries Co., Ltd. t1

Claims (1)

[Claims] (1) A first boom, a second part into which the first boom is slidably inserted.
A multistage boom having at least a boom and a 61-m into which the second boom is slidably inserted, a hydraulic cylinder having one end pivotally connected to the sixth boom and a connecting member provided at the other end; A stopper provided on the separately mentioned destination boom, a bottle hole formed to match the first boom, the second boom and the connecting member, a lashing bottle that can be freely inserted into these bottle holes, and the second boom and the sixth boom. A locking device having a bottle hole formed to match the boom, locks the lashing bottle when the front boom is extended by bringing the connecting member into contact with a stopper and extending the hydraulic cylinder. It is characterized in that it can be transferred to the bottle hole of the device,
Boom extension device in multi-stage boom.