JPH0810587Y2 - Crane rollover alarm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rollover alarm device for a hydraulic crane.

(Prior Art) Conventionally, as a rollover warning device for a hydraulic crane, for example,
According to Japanese Utility Model Publication No. 57-33028, as shown in FIG. 7, the piston rod 8 side of the telescopic cylinder device 4 provided inside the boom is connected to the base portion of the base end boom, and the cylinder tube 7 side is connected to the extension side boom. In the telescopic boom of the hydraulic crane connected to the rear part, the electric cord reel 13 connected to the power source side through the winding over warning means is provided inside the base portion of the base end boom, and the electric cord connected to the electric contact that conducts at the time of winding The reel 10 is installed inside the tip of the tip boom, while fixed wiring 22 is provided on the outside of the cylinder tube 7 of the telescopic cylinder device 4, and both ends of this fixed wiring are connected to the lead wires of the electric cord reels 10 and 13, respectively. Connected to 11 is known.

In the winding over warning device described in Japanese Utility Model Publication No. 57-33028, as shown in FIG. 7, in addition to the electric cord reel 10 at the boom tip 3a, an electric cord is provided inside the base end of the base boom 1. The reel 13 is installed, and the stoppers 15, 16, 17, 18 are provided on the outside of the cylinder tube 7 of the telescopic cylinder device 4 so as to project.
Fixed wiring 22 is installed between 6, 17 and one electric cord reel
The end of the leader line 11 of 10 is fixed to the stopper 18, the end of the leader line 14 of the other electric cord reel 13 is fixed to the stopper 15, and the stopper
15 and 16 and 17 and 18 are connected by outlets 19 and 20, respectively.

However, in the known winding over warning device described above, 2
Each of the electric cord reels 13 and 10 must be provided inside the crane boom base and tip, and the leader lines 11 and 14 of these electric cord reels 10 and 13 must be connected in the boom. When the boom is multi-staged and there are multiple telescopic cylinder devices, the wiring position becomes the back of the boom, the structure is complicated and the installation and wiring work is troublesome, and the overall price of the crane with rollover alarm device increases. There was a problem.

(Problems to be solved by the invention) The present invention eliminates the above-mentioned drawbacks of the conventional structure and simplifies the wiring inside the boom, thereby facilitating the installation and wiring work and reducing the price of the crane with a rollover alarm device. It is something to reduce.

(Means for Solving the Problem) The present invention provides a proximal boom, at least one intermediate boom slidably inserted in the proximal boom, and a distal end of these intermediate booms. Boom telescopic device for a crane, which includes a tip boom slidably inserted in the intermediate boom and telescopic means for extending and retracting the tip boom with respect to the base boom between the booms. In at least one of the expanding and contracting means for expanding and contracting the boom is an expanding and contracting cylinder device, and the cylinder tube is mounted on the cylinder tube of any one of the expanding and contracting cylinder devices. A tubular guide extending in the length direction of the electric cord and an electric cord reel provided at a proper position inside the tip portion of the tip boom, and a winding connection for energizing the fixed connection of the electric cord reel during winding. A crane winding characterized in that it is connected to a detection switch, the lead wire of an electric cord reel is inserted into the tubular guide and guided to the proximal boom side, and is led to the outside of the proximal boom and connected to an alarm device. There is an over-warning device.

(Operation) According to the present invention, with the above-mentioned configuration,
The electric cord reel only needs the electric cord reel 10 installed at the tip portion 3a of the tip boom 3, and when the boom is expanded or contracted, the lead wire 11 that is unwound or rewound from the electric cord reel 10 is guided inside the boom by the tubular guide 21. Can guide you without any problems. Therefore, only one electric cord reel is required, and a connecting means such as a stopper on the cylinder tube and an outlet is not required, and mounting and wiring work can be easily performed regardless of the number of boom stages and the number of telescopic cylinder devices. be able to. Further, since the connecting portion of the lead wire from the electric cord reel 10 is outside the boom, maintenance and inspection can be easily performed.

(Embodiment) FIGS. 1 and 2 show an embodiment of a winding over warning device according to the present invention. In the three-stage telescopic boom of the illustrated example, when the intermediate boom 2 is telescopically extended relative to the base end boom 1 by the telescopic cylinder device 4, the tip boom 3 is telescopically extended relative to the intermediate boom 2 by the wire ropes 28 and 30. In this system, the cylinder tube 7 of the telescopic cylinder device 4 is connected to the base end of the intermediate boom 2 by the shaft 25, and the tip 8a of the piston rod 8 is connected by the shaft 26 to the base end of the base boom 1. The pulley 27 is attached to the tip of the intermediate boom 2, and the pulley 27
The wire rope 28 for boom extension is hung from the base end boom 1 to the base end of the tip boom 3 via the, and the pulley 29 is attached to the base end of the intermediate boom 2, and from the tip of the base boom 1 via this pulley 29. A boom reduction wire rope 30 is laid across the base end of the tip boom 3.

A tubular guide 21 such as a pipe having substantially the same length as this cylinder tube is extended and fixed to the cylinder tube 7 of the telescopic cylinder device 4 in the length direction of the boom, and is attached at a proper position inside the tip portion of the tip boom 3. The lead wire 11 of the electric cord reel 10 is inserted into the tubular guide 21 and guided to the base end side, and is led out to the outside of the boom through the hole (not shown) of the base end wall 1a of the base end boom 1 and the lead end. 11a is connected to the connection portion 31 of the alarm horn 12 which is an alarm means. Reference numeral 32 indicates a power source connected to the alarm horn 12.

The electric cord reel 10 is connected to the winding over detection switch 9 by a fixed connection 33. In addition, 34 is a hook, 35 is a hook support, 36 is a hoisting line for the hook 34, and 37, 38, 39 are hook hoisting lines.
36 guide pulleys are shown.

In the above embodiment, the three-stage telescopic boom of the type in which the telescopic cylinder device and the telescopic rope extend and retract has been described. As shown in FIG. 4 and FIG. 4, a three-stage boom of a type that expands and contracts using two telescopic cylinder devices 4, 4 ′, as shown in FIGS. 5 and 6,
The same operation and effect can be obtained by applying the same to a four-stage boom or the like of a method of expanding and contracting using three telescopic cylinder devices 4, 4 ', 4 ". In the case of, the example in which the tubular guide 21 is attached to the telescopic cylinder device 4 has been shown, but it may be attached to the telescopic cylinder device 4 ', and in FIG. 5 and FIG. Although the example in which it is attached to the cylinder device 4 ″ is shown, it goes without saying that it may be attached to the expansion / contraction cylinder device 4 or 4 ′. As described above, when a plurality of telescopic cylinder devices are provided, the tubular guide 21 can be attached to the cylinder tube of any one of the telescopic cylinder devices.

(Effect of the Invention) According to the present invention, the structure is much simpler than that of the conventional rollover alarm device, and the wiring and mounting work can be performed easily, and therefore the price of the entire crane can be reduced. In particular, the effect is remarkable as a rollover warning device for a crane having a multistage boom with three or more stages.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a three-stage boom equipped with a rollover warning device according to the present invention in an extended state, and FIG. 2 is a schematic sectional view showing the three-stage boom shown in FIG. 1 in a contracted state, third and FIG. 4 is a schematic sectional view similar to FIGS. 1 and 2, showing an example in which the present invention is applied to a three-stage boom that is telescopic using two telescopic cylinder devices, and FIGS. 5 and 6 are three sectional views of the present invention. FIG. 7 is a schematic sectional view similar to FIGS. 1 and 2 showing an example in which a four-stage boom is expanded and contracted using the telescopic cylinder device of FIG. 7, and FIG. 7 is a three-stage boom with a conventional rollover alarm device in an extended state. It is a schematic sectional drawing shown by. 1 ... Base boom, 2 ... Intermediate boom 3 ... Tip boom, 3a ... Tip 4 ... Telescopic cylinder device, 7 ... Cylinder tube 8 ... Piston rod, 9 ... Winding over detection switch 10 ...... Electric cord reel, 11 ...... Leader wire 12 …… Alarm, 21 …… Tubular guide

Claims (1)

[Scope of utility model registration request] 1. A base end boom 1, at least one intermediate boom 2 slidably fitted in the base end boom 1, and an intermediate boom 2 on the most distal end side of these intermediate booms 2.
Boom telescopic device 4 of a crane comprising a tip boom 3 slidably inserted in the inside, and an extension / contraction means for extending / contracting the tip side boom with respect to the base end side boom between these booms. In at least one of the expansion / contraction means for expanding / contracting the boom is an expansion / contraction cylinder device 4, and any one of these expansion / contraction cylinder devices 4 is mounted on a cylinder tube of the expansion / contraction cylinder device 4. A tubular guide 21 provided extending in the length direction of the cylinder tube,
An electric cord reel 10 is provided at a proper position inside the tip portion of the tip boom 3, and a fixed wire 33 of the electric cord reel 10 is connected to a winding detection switch 9 that is energized during winding, and a lead wire 11 of the electric cord reel 11 is provided. Is passed through the tubular guide 21 to be guided to the base end boom 1 side, is guided to the outside of the base end boom 1 and is connected to the alarm device 12. The crane rollover alarm device.