JP3136094B2 - Tower crane coupling 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 tower crane having a tower boom and a tower jib attached to the top of the tower boom, and more particularly to a tower crane for connecting the tower jib to the tower boom when the tower jib is folded. A coupling device.

[0002]

2. Description of the Related Art An example of a conventional tower crane will be described with reference to FIG. A tower boom 1 is attached to the front of the crane body (not shown) so as to be able to move up and down. Have been. A backstop 4 for preventing the tower boom 1 from falling backward is provided between the lower rear portion of the tower boom 1 and the crane body, and the tower jib 2 is raised and lowered on the crane body. An up-and-down winch (hereinafter referred to as a winch) 5 and an up-and-down winch 6 for raising and lowering the tower boom 1 are provided, and a front leg 7 and a rear leg 8 constituting an A frame for supporting the tower boom 1.
Is provided.

The tip of the tower jib 2 and the swing lever 3
Is connected to each other by a guy line 9, and the other end of the swing lever 3 and a bridle 10 having a plurality of sheaves are connected to each other by a guy line 11. Undulating rope 1 unreeled from winch 5
2 is bridged between the sheave of the bridle 10 and the hanger 13. The guy line 11 is stretched over a guide roller 14 provided on the rear side of the top of the tower boom 1. The back side of the top of the tower boom 1 and a bridle 15 having a plurality of sheaves are connected to each other by a guy line 16. The undulating rope 17 extended from the winch 6 is stretched between a sheave of the bridle 15 and a hanger 18 attached to the A frame. When the hoisting rope 17 is wound on the winch 6, the tower boom 1 is raised. When the hoisting rope 17 is extended, the tower boom 1 is tilted forward of the crane main body. When the hoisting rope 12 is wound on the winch 5, the tower jib 2 is raised, and the hoist is raised. When the rope 12 is pulled out, the tower jib 2 is turned down.

In such a tower crane, when the crane is moved, it is necessary to fold the tower jib 2 as shown in FIG. As shown in FIG. 6, a hook 19 is swingably attached to the tower boom 1 and the hook 19 is hooked on a horizontal member 2a that crosses between main members of the tower jib 2, as shown in FIG. . Hook 19
A hook removing rope 21 for swinging the hook 19 is connected to the end opposite to the hooking hook portion of the hook. The hook 19 is raised by pulling down the hook removing rope 21.

After the tower jib 2 and the tower boom 1 are connected by the hook 19 in this manner, the tower boom 1 is tilted forward to attach the tower boom 1 to the ground.
Further, in order to raise the tower boom 1 again, the tower boom 1 is raised while the tower jib 2 and the tower boom 1 are connected, and after the tower boom 1 is raised, the hook 19 is removed and the undulating rope 12 is removed. The tower jib 2 is erected by winding it around the winch 5.

[0006]

When the tower boom 1 is raised and lowered in this way, the tower boom 1 and the tower jib 2
When the connection is disconnected, the up-and-down rope 12 is in the extended state, and the tower jib 2 swings due to the up-and-down operation of the tower boom 1. For this reason, when the tower jib 2 is folded and the tower boom 1 is raised and lowered, it is checked whether or not the tower jib 2 is securely connected to the tower boom 1 by the hook 19 so that the tower jib 2 does not swing. There is a need to.

For this reason, a detecting device is used which detects that the tower boom 1 and the tower jib 2 are connected by the hook 19 and informs the driver of the detection result by a lamp or the like.

However, since the detection device may malfunction, it is certain that the driver can directly visually check the connection between the tower boom 1 and the tower jib 2. Are combined in a truss shape, and the hook 19 is provided in a space surrounded by the main member. Therefore, it is determined whether or not the tower boom 1 and the tower jib 2 are connected to each other. Was difficult to visually confirm.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting device for a tower crane which can easily confirm a connecting state between a tower jib and a tower boom.

[0010]

Means for Solving the Problems (1) Referring to FIGS. 1 to 5 showing an embodiment, when the tower jib 2 is folded, the tower jib 2 and the tower boom 1
It is applied to the connection device of the tower crane which connects with.
A hook support member 42 is provided on the tower boom 2 such that both ends of the tower boom 1 project outward from a space surrounded by the main member 1a.
And a hook 19 rotatably supported at both ends of the hook support member 42. Both ends of the tower jib 2 project outward from a space surrounded by the main member 2 a constituting the tower jib 2. The above object is achieved by providing the connecting pin 46a with which the hook 19 is engaged. (2) According to a second aspect of the present invention, in the tower crane coupling device of the first aspect, the hook supporting member 42 is rotatably supported by a shaft, and a hook shaft 44 having hooks fixed to both ends thereof, and a hook shaft. And a driving member 19a that is provided at the center of the hook 44 and rotates the hook shaft 44.

According to the present invention, a pair of hooks 1 is provided outside the space surrounded by the main member 1a constituting the tower boom 1.
9 are provided, and both ends of the connecting pin 46a protrude outside the space surrounded by the main member 2a constituting the tower jib 2. Then, the pair of hooks 19 are engaged with both ends of the connection pin 46a. Therefore, whether or not the tower boom 1 and the tower jib 2 are connected can be easily confirmed from the driver's seat.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a first embodiment of a connecting device according to the present invention, and is an enlarged view of a portion F of FIG. 5 showing the configuration of the crane described in the above-mentioned conventional technique, and FIG. FIG. 3 is a circuit diagram for monitoring the state of the coupling device according to the present embodiment, and FIG.
FIG. 4 is a diagram for explaining a state in which a hook described later is hooked on a protruding pin. Since FIG. 5 has been described in the related art, a detailed description is omitted here.

As shown in FIGS. 1 and 2, the tower boom 1 has a main member 1a having an axis at four corners of a rectangular cross section.
And a horizontal member 1b connecting each of the main members 1a in a rectangular shape
And a plurality of truss members (not shown), and the tower jib 2 also includes a main member 2a, a lateral member 2b, and a truss member. The pair of main members 1a of the tower boom 1 are U bolts 41.
The connecting hook supporting member 42 is attached so that both ends 42a of the connecting hook supporting member 42 protrude outside the main material 1a.
The hook 19 is swingably attached to a protruding pin 42a protruding from the hook. That is, the hook 19 is fixed to both ends of a hook shaft 44 rotatably supported on both end support plates 43 of the hook support member 42, and a driving plate for swinging the hook 19 is provided at the center of the hook shaft 44. 19a is fixed. Similarly to the tower boom 1, the connecting pin support shafts 46 are attached to the pair of main members 2a of the tower jib 2 by U-bolts 45 so that the pins 46a at both ends thereof protrude outside the main member 2a. The hook 19 is hooked on the protruding pin 46a of the tower jib 2. A hook removal rope 21 is attached to the tip of a driving plate 19a provided at the base end of the hook 19, and the notch 19 of the driving plate 19a is provided.
A spring 19b for urging the hook 19 clockwise in FIG. 1 is attached between the hook c and the hook support member 42. Therefore, the hook 19 is constantly urged in the clockwise direction in FIG. 1, and the hook 19 is rotated to the disengaged position as shown by a two-dot chain line by pulling down the unhooking rope 21.

Next, the circuit diagram of FIG. 3 will be described.
As shown in FIG. 3, a detector 22 that is turned off when the hook 19 is securely connected to the protruding pin 46a of the tower jib 2 is attached to the hook 19 or the tower boom 1. The relay 34 is connected to the power supply 25 via the detector 22. When the detector 22 is turned on, the lamp 35b
When the detector 22 is off, the lamp 35a is energized. Lamps 35a, 35b
Is provided in the driver's seat of the crane.
Is a red lamp and the lamp 35b is a blue lamp. And
Lighting the lamp 35a informs the driver that the hook 19 and the protruding pin 46a are completely connected, and lighting the lamp 35b informs the driver that the hook 19 and the protruding pin 46a are not connected. Can be.

Next, the operation of this embodiment will be described. During normal operation, the hook 19 and the projecting pin 4
6a, the detector 22 is turned on, so that the relay 34 is energized. Therefore, the lamp 35b and the power supply 25 are energized to turn on the lamp 35b, and the driver can confirm that the hook 19 and the protruding pin 46a are not connected by turning on the lamp 35b.

When the tower crane is disassembled, the hoisting rope 12 is extended and the tower jib 2 is folded. As a result, as shown in FIG.
When it comes into contact with the tip of 9 and further folds the tower jib 2,
As shown in FIG.
Is pushed upward as shown in FIG.
Rolls up the protruding pin 46a, and the hook 19 is hooked on the protruding pin 46a as shown in FIG. In this manner, the tower jib 2 and the tower boom 1 are connected by the hook 19 only by folding the tower jib 2. on the other hand,
When the tower jib 2 and the tower boom 1 are completely connected, the detector 22 is turned off.

After connecting the tower jib 2 and the tower boom 1 as described above, the work of tilting the tower boom 1 forward is performed. The hook 19 is provided outside the space surrounded by the main member 1a of the tower boom 1. Therefore, the driver can directly visually check whether or not the tower jib 2 and the tower boom 1 are completely connected from the driver's seat. When the tower jib 2 and the tower boom 1 are completely connected, the detector 22 is turned off, the relay 34 is switched, and the power supply 25 and the lamp 35a are turned on, and the lamp 35a is turned on. Therefore, the driver can confirm that the tower jib 2 and the tower boom 1 are completely connected by turning on the lamp 35a. After confirming that the tower jib 2 and the tower boom 1 are completely connected in this manner, the driver pulls out the up-and-down rope 17 and tilts the tower boom 1 forward.

Also, when performing the work of erecting the tower boom 1, the driver visually or by turning on the lamp 35a confirms that the tower jib 2 and the tower boom 1 have been completely connected. The work of raising the tower boom 1 by winding the undulating rope 17 is performed. Then, with the tower boom 1 substantially upright, the hook 19 is removed from the protruding pin 46a, and the tower jib 2 is raised. Also at this time, the posture of the hook 19 can be reliably confirmed visually from the driver's seat.

As described above, according to the present embodiment, while the driver is in the driver's cab, the hook 19 is
It is possible to directly visually check whether or not the tower jib 2 and the tower boom 1 are securely connected to each other, or whether or not the tower boom 1 is securely disconnected.
In this case, appropriate attention can be paid to the up-and-down operation, and the up-and-down operation of the tower boom 1 can be surely performed.

In the above-described embodiment, the driver is informed of the connection state between the tower jib 2 and the tower boom 1 by the lamps 35a and 35b. You may. Further, a buzzer and a lamp may be used in combination.

[0022]

As described in detail above, according to the present invention, the hook member is provided outside the space surrounded by the main member constituting the tower boom and at a position visible from the driver's seat. Whether or not the tower boom and the tower jib are connected can be easily visually confirmed from the driver's seat. Therefore, proper attention can be paid to the operation of raising and lowering the tower boom, and the operation of raising and lowering the tower boom can be performed without fail.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a tower crane connection device according to the present invention.

FIG. 2 is a sectional view showing a configuration of an embodiment of a tower crane connection device according to the present invention.

FIG. 3 is a circuit diagram for monitoring the state of the embodiment of the tower crane coupling device according to the present invention.

FIG. 4 is a view for explaining a state in which a hook is hooked on a protruding pin.

FIG. 5 is a diagram showing a configuration of a tower crane.

FIG. 6 is a diagram showing a configuration of a conventional coupling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tower boom 1a Main material 1b Horizontal member 2 Tower jib 2a Main material 2b Horizontal member 5,6 Winch 19,39 Hook 21 Hook removal rope

Claims (2)

(57) [Claims] At 1. A Tawajibu folding, the coupling device filters work lanes to connect the said Tawajibu and the tower boom, wherein the tower boom, the main constituting the tower boom
Both ends protrude outward from the space surrounded by the material.
A hook support member provided so as to protrude , and rotatable at the both ends of the hook support member, respectively.
A pivotally supported hook is provided, and the tower jib has a main material constituting the tower jib.
Both ends protrude outward from the enclosed space
And a connecting pin for engaging the hook is provided . 2. The tower crane connecting device according to claim 1,
And The hook support member is rotatably supported on the shaft,
A hook shaft to which the hook is fixedly attached to the portion,
Provided at the center of the hook shaft to rotate the hook shaft
And a driving member.
Coupling device.