JPH08208188A - Vortex preventer of crane - Google Patents

Abstract

PURPOSE: To detect the vortex surely even if a crane wire is inclined and delivered. CONSTITUTION: This is a crane's vortex preventer consisting of a tubular guide 36, where a wire 34 to be delivered out of a guide roller 32 is passed through, and a switch box 42 having a switch 40 and a lever 46 being projected beneath the guide 36 and operating the switch 40 as capable of moving whenever a sensitive piece 50 to be installed in the wire 34 comes into contact and then unified with the guide 36 and being hung down from an arm side member attached with the guide roller 32 through a chain 38 or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane overwinding prevention device.

[0002]

2. Description of the Related Art As shown in FIG. 7, a crane unwinds a wire C from a guide roller B attached to the tip of an arm A, winds the wire C around a winch drum (not shown), and lifts a load D. It is a thing. in this case,
If the wire C is excessively wound (overwound) until it hits the guide roller B, the wire C may be cut. Therefore, an overwinding prevention device is attached to avoid this situation.

As this overwinding preventive device, a switch E is attached to an arm A or the like, a weight G connected by a chain F is hung from an operating piece of the switch E, and a lube portion H is provided on the weight G to pass the wire C through. There is. As a result, when the wire C is wound and goes up to a predetermined position, the load D lifts the weight G and operates the switch E.

[0004]

However, the wire does not only extend directly below, but may extend laterally depending on the location of the load (this is referred to as lateral pulling). When the wire is pulled laterally, the weight may be caught on the wire, and the chain may be slackened, causing the switch to operate incorrectly. The present invention solves such a problem and prevents the switch from operating only by pulling the wire laterally.

[0005]

SUMMARY OF THE INVENTION Under the above problems, the present invention provides a tubular guide through which a wire fed from a guide roller is passed, and a sensing piece provided below the switch and the guide and provided on the wire. Has a lever that moves to operate the switch when is abutted, and is integrated with the guide,
(EN) Provided is a crane overwinding prevention device including a switch box that is suspended from an arm side member to which a guide roller is attached by a chain or the like.

[0006]

By the above means, even if the guide (switch box) rides on the wire and the chain etc. slackens, the switch will not move unless the wire is wound and the sensing piece hits the lever. Does not work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings by taking a rope-type carrier which is suspended by a rope stretched in the air and moves. FIG. 4 is an explanatory view showing the usage state of this rope-type carrier, but this rope-type carrier travels with the main rope 10 between two fixed points (for example, strong trees) in a forest or the like. The rope 12 and the main rope 1
At 0, the machine body 14 is suspended and the traveling rope 12 is manually moved to move.

FIG. 5 is a side view of the rope-type carrier, and FIG. 6 is a plan view. The front suspension-supporting drum 16 and the rear suspension-supporting drum 18 are attached to the machine body 14 in a state of extending upward. The suspension drums 16 and 18 are suspended on the main rope 10 so that the machine body 14 is movably suspended. In this example, the rear suspension drum 18 is fixed to the machine body 14, but the front suspension drum 16 has two extendable arms 2 extending horizontally from the machine body 14.
0 is attached to this overhanging arm 20.

A traveling drum 26, to which power is transmitted by an engine 22 and a transmission 24, is also attached to the machine body 14, and the traveling rope 12 is wound around the traveling drum 26 two to three times. As a result, when the traveling drum 26 is driven,
The body 14 will be able to move.

Further, a crane 28 is also equipped. The crane 28 here includes a winch drum 30 provided on the machine body 14 and a guide roller 32 provided at the tip of the overhanging arm 20, and the winch drum 30 is connected to the wire 34.
Is unwound and wound around the guide roller 32 attached to the tip of the overhanging arm 20, and is unwound downward.

FIG. 1 is a side view of a main part of a device for preventing excessive winding of a wire 34 mounted on the crane 28, and FIG. 2 is a plan view.
Although FIG. 3 is a bottom view, the overwinding prevention device of this example has a tubular guide 36 through which the wire 34 is passed and an overhang arm 20.
The switch box 42 is suspended from a side member (in this example, the bracket 21 to which the guide roller 32 is attached) or the like by a chain or the like 38 and is integrated with the guide 36.

The guide 36 has a semi-circular ring 36b provided on the upper and lower sides of a metal cylindrical body 36a, and a wire 34 is inserted through the ring 36b. The switch box 42 is a metal box, and the (micro) switch 40 is housed therein. The switch 40 is actuated by a lever 46 that is substantially L-shaped in a side view and rotates around a shaft body 44 provided in a switch box 42.

That is, one end of the lever 46 projects outside the switch box 42 and extends below the guide 36, and the other end extends to the side of the operating piece of the switch 40. The other end of the lever 46 is U-shaped in bottom view having a sufficient area (FIG. 3), and the wire 34 is passed through the space therein. In addition, the wire 34
A hook 48 is usually provided at the lower end of the, but a sensing piece 50 also serving as a weight is provided immediately above the hook 48.

As described above, when the winch drum 30 is driven, the wire 34 is wound to lift the load. At this time, when the sensing piece 50 contacts the lever 46, the lever 4
6 rotates about the shaft 44 to operate the switch 40. In this case, when the lever 46 comes into contact with the ring 36b at the lower end of the guide 36, the lever 46 does not rotate any more.
A conducting wire 41 is stretched between the switch 40 and the machine body 14, and when the switch 40 operates, appropriate measures such as a buzzer sound or an automatic stop of the winch drum 30 are taken.

Next, the above-mentioned engine 22 is an internal combustion engine that burns liquid fuel, and this fuel is stored in a fuel tank 52 mounted on the body 14 (FIG. 5). The so-called lack of gas is often overlooked when there is no fuel in the fuel tank 52, but since this rope-type carrier is suspended from the main rope 10 stretched in the air. , This gas shortage is very difficult to handle.

Therefore, the fuel remaining amount sensor 54 is attached to the fuel tank 52. The remaining amount sensor 54 may have a known structure, and a buzzer or the like notifies when the remaining amount reaches a certain amount. By the way, since this type of cord-operated transporter is often operated by radio control, the buzzer can be stopped by the radio control.

It should be noted that the above description relates to the crane provided in the rope-type transporter, but the present invention can be applied to all other cranes such as stationary type and vehicle-mounted type. Needless to say.

[0018]

As described above, according to the present invention, the wire is wound even when the guide (switch box) rides on the wire and the chain or the like is loosened when the wire is pulled horizontally. The switch will not operate unless the sensing piece hits the lever. Therefore, malfunctions are reduced, and troubles during work can be avoided. In addition, since the guide also has the effect of reinforcing the switch box, it is less likely that the switch will be damaged by an external force such as a wire.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an overwinding prevention device showing an embodiment of the present invention.

FIG. 2 is a plan view of a main part of an overwinding prevention device showing an embodiment of the present invention.

FIG. 3 is a bottom view of the main part of the overwinding prevention device showing the embodiment of the present invention.

FIG. 4 is a side view of a rope-type carrier to which the present invention is applied.

FIG. 5 is a plan view of a rope-type carrier to which the present invention is applied.

FIG. 6 is an explanatory diagram of a usage state of a cord-type transporter to which the present invention is applied.

FIG. 7 is an explanatory view of an overwinding prevention device in a conventional example.

[Explanation of symbols]

 10 main rope 12 traveling rope 14 airframe 16 front suspension drum 18 rear suspension drum 20 overhanging arm 26 traveling drum 28 crane 30 winch drum 32 guide roller 34 wire 36 guide 38 chain etc. 40 switch 42 switch box 46 lever 50 sensing Piece 52 Fuel tank 54 Remaining amount sensor

Claims (3)

[Claims] 1. A cylindrical guide through which a wire fed from a guide roller is passed, and a lever that moves when a switch and a sensing piece provided below the guide and a sensing piece provided on the wire come into contact with each other to operate the switch. An overwinding prevention device for a crane, which has a switch box that is integrated with a guide and is suspended from an arm-side member to which a guide roller is attached by a chain or the like. 2. The overwinding prevention device for a crane according to claim 1, wherein a main rope and a traveling rope are stretched between two points, and a front suspension drum and a rear suspension drum mounted on the main body are suspended. While suspending and suspending the body, the traveling drum around which the traveling rope is wound is driven to move the aircraft along the main rope, and
An over-winding prevention device for a crane that is installed in a crane of a rope-type transporter that drives a winch drum wound with wire to suspend a load. 3. The crane according to claim 2, wherein the rope-type transporter uses an internal combustion engine as a drive source, and the fuel of the internal combustion engine is supplied from a fuel tank having a residual amount sensor. Overwinding prevention device.