JP3110704B2 - Crane rear post pendant rope connection device and rear post pendant rope connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane for raising and lowering a shib pivotally attached to the tip of a tower boom by changing the angle between a front post and a rear post. The present invention relates to a rear post pendant rope connection device and a rear post pendant rope connection method for connecting a distal end portion and a lower portion of a tower boom.

[0002]

2. Description of the Related Art FIG. 8 shows a large crane, in which a tower boom 2 is attached to a front portion of an airframe 1, and a live mast 3 and a high mast 4 are pivotally mounted to a rear portion of the tower boom 2. The tip of the tower boom 2 and the tip of the live mast 3 are connected by a boom support rope 5, and the live mast 3
The sheaves 6 and 7 are pivotally connected to the tip of the high mast 4 and the tip of the high mast 4, respectively.
Around.

On the other hand, a tower head 9 is attached to the tip of the tower boom 2, and a jib 10 is attached to a front portion of the tower head 9.
With the front post 1 behind the jib 10
1 and the rear post 12 are pivotally connected. The jib support rope 1 is used to connect the tip of the jib 10 and the tip of the front post 11
The sheaves 14 and 15 are pivotally connected to the front end of the front post 11 and the rear end of the rear post 12, respectively, and a jib hoisting rope 16 is looped between the sheaves 14 and 15.

Further, a front end of the rear post 12 and a lower portion of the tower boom 2 are connected by a rear post pendant rope 17. The rear post pendant ropes 17 are provided one by one on the left and right, and mounting lugs 18 are fixed to the lower part of the tower boom 2 one by one on the right and left respectively. 18 is pin-connected.

[0005] When the winch 19 is driven to raise and lower the boom hoisting rope 8, the angle between the live mast 3 and the high mast 4 changes, and the tower boom 2 hoists. Also, the winch 20 is driven to move the jib
If the jig 10 is raised and lowered, the angle between the front post 11 and the rear post 12 changes, and the jib 10 is raised and lowered.

As shown in FIG. 9, when connecting the rear post pendant rope 17 between the tower boom 2 which has been turned down horizontally and the rear post 12, first, the rear post 12 is attached to the tip of the rear post 12. The one end 17a of the pendant rope is connected, and the wire 22 of the hand winch 21 is locked to the other end 17b of the rear post pendant rope.

Next, as shown by a two-dot chain line, the rear post 12 is lifted by an auxiliary crane (not shown), and an operator winds up the wire 22 of the hand winch 21 to pull the rear post pendant rope 17, and The other end 17b of the pendant rope is pulled toward the mounting lug 18. Then, the other end 17b of the rear post pendant rope
After the pin is connected to the mounting lug 18, the hand winch 2
The first wire 22 is loosened and removed from the other end 17b of the rear post pendant rope.

[0008]

When connecting a rear post pendant rope 17 between the tower boom 2 and the rear post 12 in a large crane, as described above, a manual operation using the hand winch 21 is performed. However, since the rear post pendant rope 17 is bowed by its own weight, a large tension is required, and it is difficult to align the hole position when inserting the connect pin into the mounting lug 18. Therefore, the connection work of the rear post pendant rope 17 is difficult and involves a risk.

On the other hand, as shown in FIG. 10, the rear post backstop 23 is constituted by a hydraulic cylinder,
The rear post backstop 23 is operated by operating the hydraulic system.
Is contracted, the rear post 12 is inclined rearward and the rear post pendant rope 17 is relaxed, so that the work of connecting the other end 17b of the rear post pendant rope to the mounting lug 18 becomes easy. Further, since the rear post pendant rope 17 is not forcibly tensioned, safety during connection work can be ensured. However, rear post backstop 23
In order to drive the hydraulic cylinder, a non-leak valve and a hydraulic source are separately required, resulting in an increase in cost.

[0010] Therefore, when connecting the rear post pendant rope between the tower boom and the rear post turned down horizontally, the connection operation can be easily performed while ensuring safety, and an inexpensive connection device is provided. A technical problem to be solved arises in order to provide, and an object of the present invention is to solve this problem.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object. A tower head is mounted on the tip of a tower boom, a jib is pivotally mounted on the tower head, and a jib is provided. In a crane in which a front post and a rear post are pivotally attached to a rear portion and an angle between the front post and the rear post is changed so as to raise and lower a jib, a mounting lug fixed to a lower portion of the tower boom and a rear post are provided. A rear post pendant rope for connecting to a tip end, wherein a lower end of the rear post pendant rope is pin-connected to the mounting lug via a connecting bar and a connecting link, and a guide sheave is pivotally mounted at a position below the mounting lug. The winch rope extended from the winch is formed so as to be engageable with the connecting bar through the guide sheave, and the winch rope is connected. When was tension engaged to over,
A rear post pendant rope connection device for a crane configured such that a tip portion of a winch rope guided by a guide sheave and the rear post pendant rope are substantially aligned in a side view, and a tower boom turned down horizontally. When connecting the rear post pendant rope between the rear post and the rear post, connect one end of the rear post pendant rope to the tip of the rear post, and connect the connection bar to the other end of the rear post pendant rope, and After the extended winch rope is locked to the connecting bar through the guide sheave, the rear post is raised, and when the winch is driven to tension the winch rope, the tip of the winch rope and the rear post pendant are guided by the guide sheave. The rope and the rope are almost straight when viewed from the side Then, while pulling up the winch rope and pulling the connecting bar toward the mounting lug, the pin hole of the connecting link pin-connected to the connecting bar is aligned with the pin hole of the mounting lug, and both pin holes are connected. The present invention provides a method of connecting a rear post pendant rope of a crane, in which a pin is inserted to connect a connecting link to the mounting lug, and then the winch rope is loosened and removed from the connecting bar.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a large crane in a state where the tower boom 2 is turned horizontally. The main configuration of the large crane is substantially the same as the crane shown in FIG. The description is omitted. The large crane has left and right mounting lugs 18, 18 fixed to the lower portion of the tower boom 2, and a guide sheave 2 at the left and right central portions of the tower boom 2 below the mounting lugs 18.
5 is pivoted.

When connecting the rear post pendant rope 17 between the tower boom 2 and the rear post 12, first connect one end 17a of the rear post pendant rope to the tip of the rear post 12, and connect the other end of the rear post pendant rope. The connecting bar 30 is connected to the end 17b.

As shown in FIG. 2, the connecting bar 30 is composed of an I-shaped bar 31 in side sectional view and left and right plates 32, 32 fixed to both ends thereof. A pin hole 32a is opened, and a connect pin 33 is inserted into the pin hole 32a, and the other ends 17b of the left and right rear post pendant ropes are pin-connected. A pin hole 32b is formed in a rear portion of each plate 32, and a connecting pin 34 is inserted into the pin hole 32b, and left and right connecting links 35 are pin-connected.

The lower end of each connecting link 35 has a pin hole 3 for connecting to the mounting lug 18 of the tower boom 2.
5b is perforated. In addition, connecting lugs 18, 35 are provided on both sides of the connecting bar 30 with connecting links 35, 35 therebetween.
The dimension between the left and right plates 32, 32 is formed to be substantially equal to the dimension between the left and right mounting lugs 18, 18, so as to be able to be connected.

On the other hand, a bracket 36 is fixed to the substantially central lower surface of the I-shaped bar 31, and a pin hole 36a for a winch rope is formed in the bracket 36. As shown by a two-dot chain line in the figure, the tip of the winch rope 40 is engaged with the bracket 36, the connect pin 37 is inserted into the pin hole 36a, and the winch rope 40 is connected to the bracket 36. As shown in FIG. 1, the winch rope 40 is fed out of the winch 41, passes below the guide sheave 25, and is locked to the connecting bar 30.

After driving the auxiliary crane (not shown) or the winch 41 to raise the rear post 12, as shown in FIG. 3, the winch 41 is driven to wind the winch rope 40, and the rear post The pendant rope 17 is pulled and tensioned. At this time, the guide sheave 25 guides the tip portion of the winch rope 40 and the rear post pendant rope 17 so that the connecting bar 30 Are substantially straight through when viewed from the side.

When the winch rope 40 is further wound up in this state, as shown in FIG. 4, the connecting bar 30 moves in the direction of the arrow A, and the connecting link 35 connected to the rear portions of the left and right plates 32 is moved. It approaches the mounting lug 18, and the pin hole 35 b at the lower end of the connecting link 35 is attached to the mounting lug 18.
Pin hole 18a. The connecting link 35 is a pin 3
4, the pin holes 35b,
The alignment of 18a is very simple.

As shown in FIGS. 5 and 6, when the pin holes 35b of the left and right connecting links 35 coincide with the pin holes 18a of the left and right mounting lugs 18, the connect pins 42 are inserted into both pin holes 35b, 18a. Then, the lower end of the connecting link 35 is pin-connected to the mounting lug 18. Thus, the rear post pendant rope 17 is connected between the tower boom 2 and the rear post 12.

Thereafter, when the winch rope 40 is lowered and relaxed, the rear post 12 pulls the rear post pendant rope 17 forward as shown by the two-dot chain line in FIGS. Is connect pin 4
2 rotates counterclockwise in the figure. Then, when the winch rope 40 is removed from the bracket 34 of the connecting bar 30, the connection work of the rear post pendant rope 17 is completed.

Here, reference numeral 43 denotes a rear post backstop, which is formed so as to be able to freely expand and contract.
When the rear post pendant rope 17 shown in FIG. 7 is connected, the rear post backstop 43 is fixed at the most contracted position. In addition, when the rear post pendant rope is removed when the crane is disassembled, the operation can be easily performed by performing the operation reverse to the above connection.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0023]

As described above, according to the present invention, the left and right
By pulling one or more rear post pendant ropes with a single winch rope through a connecting bar, the installation of multiple rear post pendant ropes in a short time can be performed without the need for operator's labor. It became possible to connect to lugs. Further, since the winch rope is locked to the connection bar through the guide sheave, when the winch rope is tensioned, the tip portion of the winch rope guided by the guide sheave and the rear post pendant rope are viewed from the side. Therefore, the connecting link is freely rotated with respect to the connecting bar, so that the connecting pin can be easily positioned and the safety at the time of operation can be improved. Further, since no hydraulic device is used, an inexpensive connection device can be provided.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a side view of a large crane in a state where a tower boom is horizontally turned down.

2A and 2B show an embodiment of the present invention, wherein FIG. 2A is a plan view of a connecting bar, and FIG. 2B is a side view of the connecting bar.

FIG. 3 is a side view of the large crane showing the embodiment of the present invention and showing a connecting process of a rear post pendant rope.

FIG. 4 is an essential part side view of a mounting lug and a guide sheave showing a connecting process of a rear post pendant rope.

FIG. 5 is an essential part side view of a mounting lug and a guide sheave showing a state where a rear post pendant rope is connected.

FIG. 6 is a plan view of a main part of FIG. 5;

FIG. 7 is a side view of the large crane with a rear post pendant rope connected.

FIG. 8 is a side view of a conventional large crane.

FIG. 9 is a side view of a large crane showing a connecting process of a conventional rear post pendant rope.

FIG. 10 is a side view of a large crane showing another connection process of a conventional rear post pendant rope.

[Explanation of symbols]

 2 Tower boom 9 Tower head 10 Jib 11 Front post 12 Rear post 17 Rear post pendant rope 18 Mounting lug 25 Guide sheave 30 Connection bar 35 Connection link 40 Winch rope 41 Winch

Claims (2)

(57) [Claims] 1. A tower head is mounted on a front end of a tower boom, a jib is pivotally mounted on the tower head, and a front post and a rear post are pivotally mounted on a rear part of the jib. The angle between the front post and the rear post is changed. In a crane adapted to raise and lower a jib, a rear post pendant rope for connecting a mounting lug fixed to a lower portion of the tower boom and a tip end of the rear post, wherein a lower end of the rear post pendant rope is provided. Is pin-connected to the mounting lug via a connecting bar and a connecting link, and a guide sheave is pivotally mounted below the mounting lug so that a winch rope extended from a winch can be locked to the connecting bar through the guide sheave. When the winch rope is locked to the connecting bar and tensioned, the winch rope guided by the guide sheave A rear end pendant rope connection device for a crane, wherein a tip portion of the rear post pendant rope and the rear post pendant rope are substantially aligned in a side view. 2. When a rear post pendant rope is connected between a tower boom that has been turned down horizontally and a rear post, one end of the rear post pendant rope is connected to the tip of the rear post, and the rear post is connected to the rear post. When the connecting bar is connected to the other end of the pendant rope, and the winch rope extended from the winch is locked to the connecting bar through the guide sheave, the rear post is raised, and the winch is driven to tension the winch rope. The guide sheave guides the tip of the winch rope and the rear post pendant rope so that they are substantially aligned in a side view.Furthermore, the winch rope is wound up and the connecting bar is pulled to the mounting lug, and is pin-connected to the connecting bar. The pin hole of the connecting link and the pin hole of the mounting lug, 2. A crane using a rear post pendant rope connecting device according to claim 1, wherein a connecting pin is inserted into both pin holes to connect the connecting link to the mounting lug, and then the winch rope is loosened and removed from the connecting bar. Rear post pendant rope connection method.