JPS5839758B2 - Cantilever bridge crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cantilever bridge type crane, and its main object is to improve a rope-type traveling drive device.

The rope trolley set traveling device (rope trolley set traveling device) installed on the cantilever bridge type crane is shown in Fig. 1.
- As shown in 6, the girder can run along a cantilever set elevating girder 3 extending in front of the front leg 1 and a fixed girder 4 installed between the front and rear legs 1 and 2 and behind the rear leg 2. A traveling main body 5b is of a suspension traveling type and has front and rear wheels 5a, 5a' engaged with guide rails (not shown) of a girder, and a winding provided inside the traveling main body 5b for winding up and down the lifting wire 5d of the gripper 5c. The take-up drum 5e, the winding drum 5e provided at the rear of the lower part of the traveling body 5b, the gripper 5C1, the traveling body 5
b, an operator's cab 5f for operating the crane main body CR1, the elevating girder 3, etc., and a rope traction type traveling drive device having a traction rope 6a connected to the traveling main body 5b.

The rope traction type traveling drive device winds the intermediate part of the traction rope 6a around a drum 6b for rope traction drive provided on the fixed girder 4, and the forward traction side 6 of the traveling body of the traction rope 6a.
a-1 [tensioning device 6c-elevating girder 3 and fixed girder 4]
Sheave mechanism 6d-1 for bending absorption provided at the connection part with
6d-3-The tip of the return sheave mechanism 6e-1, 6e-2) at the front end of the elevating girder 3 is connected and fixed to the rear wheel support portion of the traveling main body 5b via each guide, and the tow rope 6a is Move the traveling body backward traction side 6a-2 [fixed girder 4
The tip of the rear return sheave mechanism 6f-1゜6f-2 passes through each guide of the sheave mechanism 6g-1) for bending absorption provided at the connection between the elevation garter 3 and the fixed girder 4, and then connects its tip to the traveling main body 5b. It is connected and fixed to the rear wheel support part to form a closed loop, and the traveling main body 5 is driven by normal and reverse rotation of the drum 6b.
This allows the car to move forward and backward.

The rope traction type traveling drive device includes a tensioning device 6c.
This absorbs the slack of the towing rope 6a due to the expansion and contraction of the towing rope 6a itself or the play of each sheave mechanism, as well as a part of the significant rope loosening and tightening during the up-and-down movement of the up-and-down girder 3, and the sheave mechanism 6d- 1-6d-3 and 6g-1
The tensioning device 6c is made smaller by absorbing most of the rope slackening and tightening during the elevating motion of the elevating girder 3.

However, the sheave mechanism for absorbing bending has many bending points, and the tensioning device 6C has conventionally been fixed in position on the fixed girder 4, and the tension absorbing portion of the drag rope 6a is connected to the fixed sheave 6cm1° as shown in the figure. 6cm2 and fixed sheave 6c-
A movable sheave 6c installed between 1 and 6C-2 so as to be movable up and down.
The movable sheave 6cm3 is supported by a hydraulic cylinder mechanism 60-4 with a predetermined upward movement force applied, and the traction rope 2 between the fixed sheaves 6cm1 and 6cm2 is
A predetermined upward tensile force is always applied to part a to form a loop for absorbing loosening and straining of the rope.

While maintaining this state, the traveling body 5-
In order to run the rope 6, the line resistance in the sheave mechanism for absorbing bending and the tensioning device 6c is large, and an extremely large drum rotational driving force is required.Moreover, the rope itself deteriorates due to repeated bending and its lifespan is shortened. This made it extremely short-lived.

The present invention provides an excellent rope-type traveling device that solves these problems all at once.The main feature of the present invention is that the traveling main body is movably installed on a cantilever set elevation girder and a fixed horizontal girder. The forward pulling side of the traveling body of the towing rope of the rope towing type traveling 1 drive device provided on the fixed horizontal girder side is connected to the traveling body through the tip of the up-and-down girder, and the backward pulling side of the traveling body of the towing rope In a cantilever bridge type crane having a rope trolley set traveling device that is connected to the traveling body and pulls the traveling body to move it forward and backward, the towing rope has a forward pulling side of the traveling body or a backward pulling side of the traveling body The cantilever bridge type crane is provided with a rope tensioning device having a fixed sheave and a movable sheave through which at least one of the movable sheaves is inserted and guided, and a mechanism for applying a rope tensioning force to the movable sheave, which is installed in the traveling main body.

That is, in the present invention, the tensioning device 7 is provided on the traveling main body 5b as described above.
is installed so that it can move together with the traveling body 5b, the guideline of the tow rope 6a that pulls the traveling body 5b is replaced by a simple return sheave (6e-1, 6e-2, 6f-L).
6f-2) or this and a sheave (6d-1 to 6d-3, 6g-1) for refraction guide of the running path (3, 4). When the guideline is in a horizontal state, the bends of the guideline are limited to the return sheaves (6e-1, 6e-2, 6f-1, 6f-2), which significantly reduces the line resistance, and the rope traction drive drum The rotation and driving force of the towing rope 6b are significantly reduced, and the frequency of repeated bending of the towing rope 6a is equally reduced, thereby maintaining a healthy state over a long period of time.

Thus, the tension device 7 in the present invention is attached to either the forward-travel traction side 6a-1 end of the travel body 5b or the reverse traction side 6a-2 end of the tow rope 6a attached to the travel body 5b so that it can be pulled. However, as shown in the embodiment shown in FIGS. 2 to 4, both ends of the forward and backward traction sides 6a-1 and 6a-2 may be attached so as to be tensionable. It is preferable to have a structure in which the rope tensioning force of the hydraulic cylinder 7a (an example of a mechanism that applies rope tensioning force to the movable sheave) is the same as in the case of either one of the above installations. Since it is possible to secure double the tension absorption of the tow rope, the bending sheave 6d-2 of the tow rope guideline shown in FIG. 1, for example, shown in FIG. Three locations can be eliminated, further extending the rope life.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

This example is an example applied to a rope trolley set traversing device installed in a cantilever set bridge type crane shown in Fig. 1.
The overall configuration is shown in FIG. 2, and the same parts as in FIG. 1 are given the same reference numerals and detailed explanation thereof will be omitted.

In the circle A of FIG. 2 and in FIGS. 3 and 4, the traveling body 5b
A tensioning device 7 is fixedly installed on the rear wheel support portion of the vehicle.

The tensioning device 7 is connected to the forward pulling side 6 of the traveling body of the towing rope 6a.
a fixed sheave 7a forming a loose tension absorption section at the a-1 end;
A fixed sheave 7b forming a loose tension absorbing section at the end of the traveling main body backward traction side 6a-2 of the towing rope 6a, and both ends of the towing rope 6a (6a
-1, 6a -2) and a double groove type movable sheave 7c that can be moved downward simultaneously;
It consists of a hydraulic cylinder 7d that always applies a downward movement force of a predetermined pressure to C, and a frame 7e incorporating each of these sheaves and the hydraulic cylinder 7d.

The end of the traveling main body forward traction example 6a-1 of the towing rope 6a is connected to a fixed sheave 7a and a double groove type movable sheave 7c.
It is wound and connected to a rope winding adjustment drum 8 provided on the upper part of the frame body 7e via the m1 side, so that the effective pulling length of the pulling rope 6a can be finely adjusted.

Further, the end of the towing rope 6a on the backward traction side 6a-2 of the traveling body is connected to a fixed sheave 7b and a double groove type movable sheave 7c.
It is connected and fixed to the upper part of the frame 7e via the cm2 side with a stopper 9.

The bearing 7g of the double groove type movable sheave 7C has its upper part connected to the piston door of the hydraulic cylinder 7d.
A guide 7 is attached to the tip of the frame body 7e and formed inside the frame body 7e.
It is engaged and supported so that it can be raised and lowered.

[Brief explanation of the drawing]

Fig. 1 is a side explanatory view showing a conventional example, Fig. 2 is a side explanatory view showing an embodiment of the present invention, Fig. 3 is a detailed explanatory view of the main part in circle A in Fig. 2, and Fig. 4 is FIG. 3 is an enlarged cross-sectional explanatory view taken from arrow BB in FIG. 3; In the figure, 3... Elevation girder for the running road, 4
...Fixed girder for running road, 5b...
Traveling body, 6a...Tow rope, 7...
・Tension device, 7c...Double groove type movable sheave.

Claims (1)

[Claims] 1. A cantilever complete set of elevating girder and a fixed horizontal girder are provided with a traveling body so as to be movable, and the forward pulling side of the traveling body of the traction rope of the rope traction traveling drive device provided on the side of the fixed horizontal girder is passed through the tip of the elevating girder. , a cantilever one-piece bridge crane having a rope trolley set traveling device connected to the traveling main body, the backward pulling side of the traveling main body of the traction rope is connected to the traveling main body, and the traveling main body is pulled and moved forward and backward. , a fixed sheave and a movable sheave through which at least one of the forward pulling side of the traveling body or the backward pulling side of the traveling body of the towing rope is inserted and guided;
1. A cantilever bridge type crane, characterized in that a rope tensioning device having a mechanism for applying a rope tensioning force to the movable sheave is installed on the traveling main body.