JP3272683B2 - Counterweight self-removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight self-removing device for detaching a counterweight mounted on a construction machine such as a crane by itself.

[0002]

2. Description of the Related Art In self-propelled cranes, a counterweight is attached to the rear end of an upper revolving structure in order to improve the stability of the body and increase the lifting capacity. The counterweight needs to be detached when the lifting capacity is adjusted according to the work or when the body is disassembled and transported. For this reason, conventionally, for example, a self-removing device for the counterweight shown in FIG. 3 has been used.

[0003] A counterweight 2 is mounted on the rear end of the upper swing body 1 of the crawler crane. The counterweight 2 is divided in a direction perpendicular to the ground 3 and has a weight portion 2a having a convex planar shape and a concave weight portion 2 having a planar shape fitted to the convex portion.
b. Hanging lugs 4a, 4b are provided at the same height above the weight portions 2a, 2b.

A hydraulic cylinder 6 is provided on the back of the A frame 5, and one end of a self-removing rope 7 is attached to a rod end of the hydraulic cylinder 6.
The self-attaching detachable rope 7 is hung on a sheave 8 provided on the top of the A frame 5, and a bracket 9 is attached to the other end hanging down from above the counterweight 2.

To lower the counterweight 2 from the rear end of the upper swing body 1, first, the cylinder 6 is extended and the bracket 9 is connected to the suspension lug 4b. Next, the cylinder 6 is contracted to lift the weight portion 2b, and then the weight portion 2b is lowered onto the ground 3 as shown. Next, the cylinder 6 is extended again, and the bracket 9 is connected to the suspension lug 4a. Then, the cylinder 6 is contracted to lift the weight portion 2a, and thereafter,
The weight portion 2a is lowered on the ground 3.

[0006]

However, in the conventional counterweight self-removing device, the counterweight 2 is divided in the vertical direction perpendicular to the ground 3, and each of the weight portions 2a and 2b is divided. Lack of stability. For this reason, at the time of loading / unloading on a trailer at the time of transportation / assembly, it is necessary to stabilize each weight portion 2a, 2b by tilting it sideways, and this conventional operation of tilting heavy weights involved risks.

On the other hand, in order to avoid this dangerous work,
What is necessary is just to divide the counterweight in the direction parallel to the ground. When the counterweight is divided in the horizontal direction that is horizontal to the ground, the contact area of the divided weight portion is increased, so that the stability is improved. Therefore, the divided weight portions can be loaded and unloaded to and from the trailer in the same posture, thereby avoiding a dangerous work of falling down sideways.

[0008] However, when the counterweight is divided horizontally, the height of the suspension lug provided at each of the divided weight portions differs. In the conventional counterweight self-removing device, the self-removing rope 7 and the bracket 9 are used.
Is limited by the stroke of the cylinder 6. For this reason, the bracket 9 does not reach the suspension lug of the lower weight portion of the horizontally divided weight portions. That is, in the conventional counterweight self-detachment device, if the counterweight is divided horizontally, the counterweight cannot be detached by itself.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a cylinder provided on the back of an A frame, one end of which is attached to the cylinder, and which is mounted on the top of the A frame. A rope attached to the sheave provided, the other end of which hangs on the counterweight; and a bracket attached to the other end of the rope, which reaches a lug provided on the upper part of the counterweight when the cylinder extends. In a self-removing device for a counterweight, the counterweight is divided into a plurality of parts in a direction parallel to the ground, a lug is provided at an upper part of each of the divided weight parts, and a bracket located when the cylinder extends, It has a length that reaches the lug provided on the other weight parts located below the weight part other than the uppermost weight part. Characterized by comprising a link for connecting the door and the this lug.

According to this structure, even if the counterweight is divided horizontally, the lug of the weight portion located below the uppermost weight portion of the horizontally divided weight portions is connected to the bracket. Link is received.
Therefore, when the link is connected to the lug, the bracket is connected to the weight portion located below.

Further, the present invention is characterized in that the link is provided with a connecting portion for connecting a bracket located when the cylinder extends and each lug provided on each of the divided weight portions. .

According to this structure, it is not necessary to prepare a plurality of types of links having different lengths, and furthermore, each weight portion can be detached and attached by the same expansion and contraction operation of the cylinder as before.

Further, the present invention is characterized in that a storage portion for storing a link or a connecting tool for connecting the link and the lug is provided in the lowermost or lowermost weight portion of the uppermost stage. .

According to the present structure, the link and the connector can be used immediately when needed, and are not lost.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of an embodiment in which a self-removing device for counterweight according to the present invention is applied to a crawler crane.

FIG. 1A is a side view of a main part of a crawler crane provided with a self-removing device for a counterweight according to the present embodiment, and FIGS. 1B and 1C show a detachment process using the self-removing device. FIG.

A counterweight 12 is attached to the rear end of the upper revolving structure 11 of the crawler crane. The counterweight 12 is divided into three parts in a horizontal direction parallel to the ground 13, and has three weight parts 12a, 12a.
b, 12c. Suspended lugs 14a, 14b, 14c are provided above the divided weight portions 12a, 12b, 12c, respectively. These suspension lugs 14a, 14b, 14c are provided as a pair on each of the left and right sides in the width direction of the body.

The upper revolving unit 11 is provided with an A frame 17 including an upper strut 15 and a back stay 16. The A frame 17 is also called a mast, and a hydraulic cylinder 18 is provided on a back surface thereof. One end of a self-removing rope 19 is attached to the rod end of the hydraulic cylinder 18. The self-attaching detachable rope 19 is hung on a sheave 20 provided at the top of the A frame 17, and a bracket 21 is attached to the other end hanging on the counterweight 12.

These upper struts 15, back stays 16, hydraulic cylinders 18, self-removable ropes 19,
A pair of sheaves 20 and brackets 21 are also provided on each of the left and right sides in the width direction of the body.

The bracket 21 is provided above the counterweight 12 when the A frame 17 is tilted to the rear side of the fuselage as shown by a dashed line and the rod of the hydraulic cylinder 18 is extended, as shown in FIG. To the hanging lug 14a. Also, this bracket 21 has
The link 22 is connected as shown in FIG.

This connection is performed by aligning the pin holes opened in the bracket 21 with the pin holes 22a and 22b opened in the link 22, and inserting the pin 23. The pin hole 22a opened in the short piece and the pin hole 22b opened in the long piece of the link 22 are provided with the bracket 21 positioned when the hydraulic cylinder 18 is extended and the suspension provided on each of the divided weight portions 12b and 12c. Lug 14
b, 14c.

The link 22 is connected to each of the suspension lugs 14b, 14c.
It has a fan shape that requires a pin hole 22c that is a connecting portion with the
a and 22b are arranged in an arc shape at the peripheral end of this fan. Here, the distance R1 between the pin hole 22c and the pin hole 22b,
The difference (R1-R2) between the pin hole 22c and the distance R2 between the pin holes 22a is represented by the hanging lugs 14a and 14a.
b, that is, the height of the uppermost weight portion 12a. The distance R2 between the pin holes 22c and the pin holes 22a is equal to the distance between the suspension lugs 14b and the suspension lugs 14c, that is, the height of the second-stage weight portion 12b.

The link 22 is, as shown in FIG.
Bracket 2 located when hydraulic cylinder 18 is extended
1 to a hanging lug 14c provided on the lowermost weight portion 12c, and connects the bracket 21 to each of the hanging lugs 14b and 14c. In this connection, the pin hole 22c of the link 22 is connected to the suspension lug 14b, 1
This is performed by inserting the pin 24 into each pin hole opened in 4c.

A recess 25 for accommodating the two links 22 and the two pins 24 is formed in the weight portion 12b at the next lower stage of the uppermost stage. The recess 25 constitutes a storage section. FIG. 2A shows the weight portion 1
2B is a plan view, and FIG. 2B is a side view thereof.
The link 22 and the pin 24 are provided in the recess 2 as shown in FIG.
5, and does not protrude from the stacking surface of the weight portions 12b. Here, the pin 24 constitutes a connecting tool for connecting the link 22 and the suspension lugs 14b, 14c.

In such a configuration, the upper rotating body 11
The removal of the counterweight 12 from the rear end is performed as follows for each of the weight portions 12a, 12b, and 12c.

First, the uppermost weight portion 12a is removed. For this purpose, the pin 23 is pulled out from the side of the upper strut 15, and the bracket 21 locked to the side of the upper strut 15 by the pin 23 is usually removed as shown in FIG. Therefore, the rope 19
And the bracket 21 hangs down from the sheave 20. Next, the A frame 17 is lowered, and the bracket 21 is positioned above the suspension lug 14a of the weight portion 12a.

Next, the hydraulic cylinder 18 is extended, the bracket 21 is lowered, and the pin hole of the bracket 21 is aligned with the pin hole of the suspension lug 14a. Then, a pin 23 is inserted into each pin hole, and the bracket 21 is fixed to the suspension lug 14a as shown in FIG. Next, the hydraulic cylinder 18 is contracted, and the weight portion 12a is lifted upward. In this state, the A frame 17 is tilted to a position where it can be tilted. Subsequently, the hydraulic cylinder 18 is extended and the weight portion 12a is grounded. Next, the pin 23
Is released, and the fixing between the bracket 21 and the suspension lug 14a is released.

Next, the next-stage weight portion 12b is removed. Therefore, the A frame 17 is raised, and the bracket 21 is positioned above the suspension lug 14b of the weight portion 12b. Next, the link 22 and the pin 24 housed in the recess 25 are taken out. Then, the pin hole of the bracket 21 and the pin hole 22a of the link 22 are aligned, the pin 23 pulled out from the suspension lug 14a is inserted, and the bracket 21 and the link 22 are connected.

Next, the hydraulic cylinder 18 is extended, and the pin hole 22c of the link 22 is aligned with the pin hole of the suspension lug 14b. Then, the pin 2 taken out of the recess 25
4 is inserted, and the link 22 is fixed to the suspension lug 14b as shown in FIG. Next, the hydraulic cylinder 18 is contracted, and the weight portion 12b is lifted upward. In this state, the A frame 17 is tilted to a position where it can be tilted. Subsequently, the hydraulic cylinder 18 is extended and the weight portion 12b is grounded. Next, the pin 24 is pulled out, and the link 22 and the suspension lug 14b are unlocked.

Next, the lowermost weight portion 12c is removed. To this end, the A frame 17 is raised, and the link 22 is positioned above the suspension lug 14c of the weight portion 12c. Next, the pin 23 connecting the link 22 and the bracket 21 is removed, and the pin hole 22 of the link 22 is removed.
b and the pin hole of the bracket 21 are aligned. Then, the removed pin 23 is inserted, and the bracket 21 and the link 22 are newly connected.

Next, the hydraulic cylinder 18 is extended, and the pin hole 22c of the link 22 is aligned with the pin hole of the suspension lug 14c. Then, the pin 24 pulled out from the suspension lug 14b is inserted, and the link 22 is fixed to the suspension lug 14c as shown in FIG. Next, the hydraulic cylinder 18
Is reduced, and the weight portion 12c is lifted upward. In this state, the A frame 17 is tilted to a position where it can be tilted, and subsequently the hydraulic cylinder 18 is extended to ground the weight portion 12c. Finally, the pin 24 is removed, and the link 22 and the suspension lug 14c are released.

The removed counterweight 12
Is mounted on the rear end of the upper revolving unit 11 in the reverse order to the above for each of the weight portions 12a, 12b, 12c.

As described above, according to the counterweight self-removing device of the present embodiment, even if the counterweight 12 is divided horizontally, the horizontally divided weight portion 1
The links 22 connected to the brackets 21 reach the suspension lugs 14b, 14c of the lower weight portions 12b, 12c among the 2a, 12b, 12c. Therefore,
The link 22 is connected to the suspension lugs 14b, 14c, so that the weight portions 12b, 12
c, the bracket 21 is connected, and the distance between the lower limit position of the bracket 21 and the suspension lugs 14b, 14c is absorbed.

That is, according to the present embodiment, it is possible to divide the counterweight 12 in the horizontal direction parallel to the ground 13, and the divided weight portions 12a to 12c
, The contact area is increased, and the stability is improved. Therefore,
The divided weight portions 12a to 12c can be loaded and unloaded to and from the trailer in the same posture, thereby avoiding the conventional dangerous work of turning sideways.

In the structure of the self-removing device of this embodiment, pin holes 22a and 22b for connecting the bracket 21 and the suspension lugs 14b and 14c are provided in the short and long pieces of one link 22. Therefore, even if there are two types of distances between the lower limit position of the bracket 21 and the suspension lugs 14b and 14c, these distances are absorbed by one type of link 22. For this reason, according to this structure, it is not necessary to prepare a plurality of types of links 22 having different lengths, and the weight portions 12b and 12c are detached by their own operation by the expansion and contraction operation of the hydraulic cylinder 18 as in the related art.

In this embodiment, the weight portion 12
Since the concave portion 25 for accommodating the link 22 and the pin 24 is provided in b, the link 22 and the pin 24 can be used immediately when necessary, and are not lost.

In the above embodiment, the weight portion is 3
The self-removal of the counterweights stacked on the tier has been described. In this case, the link 22 has a fan shape requiring a connecting portion (22c) with each of the hanging lugs 14a, b, and c, and has two connecting portions (22a, 2a) with the bracket 21.
2b) was arranged in an arc at the peripheral end of the fan. However, the present invention can be similarly applied to self-removal of counterweights stacked in another plurality of stages such as four stages.

For example, in the case of four steps, there are three connecting portions of the link to the bracket, and these connecting portions are arranged in an arc at the peripheral end of the fan. In this arrangement, the farthest connecting part is located at the right end of the fan peripheral end, the farthest connecting part is placed at the center of the fan peripheral end, and the closest connecting part is located at the left end of the fan peripheral end It may be placed, or the connection part furthest from the center is placed at the center of the fan peripheral end, then the farthest connection part is placed at the right end of the fan peripheral end, and the closest connection part is placed It may be arranged at the left end of the end.

Further, in the above-described embodiment, the case where the link is constituted by one plate-like piece has been described. However, this link can be constituted by a chain. In this case, by providing a plurality of hooks constituting the connecting portion in the middle of the chain, the same operation and effect as in the above embodiment can be obtained.

Further, in the above-described embodiment, the case where the concave portion 25 is formed in the weight portion 12b of the next lowermost stage is described. Good. In this case, the same effects as those of the above embodiment can be obtained.

[0041]

As described above, according to the present invention, even if the counterweight is divided horizontally, the lug of the weight portion located below the uppermost weight portion among the horizontally divided weight portions is obtained. Receives the link connected to the bracket. Therefore, the divided weight portions can be loaded and unloaded onto and from the trailer in the same posture, thereby avoiding the conventional dangerous work of tilting sideways.

Further, by providing the link with a connecting portion for connecting the bracket and each lug, it is not necessary to prepare a plurality of types of links having different lengths. Accordingly, the self-removing device is simply configured with a small number of parts.

Further, by providing a storage portion for storing a link or a connecting tool for connecting the link and the lug to the lower one step or the uppermost weight portion of the uppermost step, the link or the connecting tool can be used when necessary. It can be used immediately and will not be lost.

[Brief description of the drawings]

FIG. 1A is a side view of a main portion of a crawler crane provided with a self-removing device for a counterweight according to an embodiment of the present invention, and FIGS. 1B and 1C are desorption processes using the self-removing device. FIG.

FIG. 2A shows a weight portion 12 in the present embodiment.
It is a top view of b, and (b) is its side view.

FIG. 3 is a side view of a main part of a crawler crane provided with a conventional counterweight self-removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Counter weight 12a, 12b, 12c ... Weight part 14a, 14b, 14c ... Hanging lug 15 ... Upper strut 16 ... Back stay 17 ... A frame 18 ... Hydraulic cylinder 19 ... Self-removable rope 20 ... Sheep 21 ... Bracket 22 ... Links 22a, 22b, 22c ... pin holes 23, 24 ... pins 25 ... recesses

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 23/74 B66C 23/76

Claims (6)

(57) [Claims] 1. A cylinder provided on the back surface of an A frame, a rope having one end attached to the cylinder, a rope hung on a sheave provided on the top of the A frame, and the other end hanging on a counterweight, A counterweight self-detachment device comprising a bracket attached to the other end of the rope and reaching a lug provided above the counterweight when the cylinder extends, wherein the counterweight is horizontal to the ground. A plurality of weights are provided in the upper portion of each of the divided weight portions, and other weight portions located below the uppermost weight portion from the bracket positioned when the cylinder extends. And a link for connecting the bracket and the lug. Self desorber of the counterweight, characterized in that the. 2. The link according to claim 1, wherein the link has a connecting portion connecting the bracket positioned when the cylinder is extended and the lugs provided on each of the divided weight portions. A self-removing device for the counterweight according to the above. 3. The link has a fan shape requiring a connection portion with each of the lugs, and the connection portion with the bracket is arranged in an arc shape at a peripheral end of the fan. The self-removing device of the counterweight according to claim 2. 4. The device according to claim 2, wherein the link is formed of a chain. 5. The counterweight according to claim 1, wherein the counterweight has a storage portion for storing the link in a lower portion of the uppermost stage or a weight portion of the uppermost stage. Self-removing device for the counterweight according to the paragraph. 6. The storage section also stores a connector for connecting the link and the lug.
A self-removing device for the counterweight according to the above.