JPH0455029Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a warning device for a crane.

Prior Art Conventionally, when a crane truck works under power lines,
There is a risk of contact with the power lines, so as part of the prevention, a rope indicating the approach limit commensurate with the height of the power line is attached to the boom of the crane and suspended.
Accidents have previously been prevented by monitoring the operating range of the boom using a suspended rope, but this accident prevention method had the inconvenience of having to constantly monitor the rope and not be able to take one's eyes off the rope.

Problems that the present invention aims to solve In the conventional technology, as mentioned above, the rope was constantly monitored and there was the inconvenience of not being able to take one's eyes off the rope.Therefore, the present invention not only relies on the human eye to check the condition of the rope. The purpose of this invention is to provide a countermeasure that can effectively prevent crane accidents by sensing the state of approaching electric wires and automatically activating a warning device.

Means for Solving the Problems In order to achieve the above objectives, the present invention not only monitors the operating range of the boom by attaching a rope to the boom that indicates the approximate approach limit commensurate with the height of the power transmission line. If the crane comes close to the power lines, the approach is electrically sensed and an alarm is automatically generated to prevent crane accidents. As a means for generating this alarm, an automatic switch is provided on the alarm, a battery that serves as the power source for its operation, and a circuit that connects the two, and these are housed in a case with an appropriate external shape. The upper end of the mantle frame is attached to the lower end of a rope of the required length that is attached to the boom of the crane, so that it moves on the ground as the boom moves during crane operation, and the boom approaches the power lines, creating a dangerous situation. The time frame is designed to automatically create a state in which an alarm is generated, that is, a state in which the alarm circuit is closed.

Operation The alarm generator configured as described above is constructed by attaching a rope with a length that corresponds to the wire access limit to the boom in advance, and connecting the lower end of this rope to the head of the mantle housing the alarm generator. connected via pins,
When the crane is operating, the mantle is dragged on the ground with a rope, and at this time, the alarm inside the mantle and the switch on the circuit that connects the power supply are activated when the mantle is suspended upright. The other parts are kept open at all times, and the mantle frame is suspended from a rope.
When suspended vertically away from the ground, the switch on the circuit is configured to close automatically, so in this case, current flows directly to the alarm circuit and generates an alarm. If this alarm is generated as a guide for when the boom approaches a power transmission line, the operator of the crane can work with peace of mind, and accidents on the power transmission line can be prevented.

Example An example will be explained with reference to drawings. At a construction site, a rope 1 indicating the approximate approach limit commensurate with the height of a power transmission line is attached to the boom 3 of a crane vehicle 2 to predict the operating range of the boom. Then, a mantle frame 4 with an alarm device is attached to the lower end of the rope as shown in FIG. As shown in FIG. 2, the mantle frame 4 is formed into a cylindrical shape 5 from a suitable synthetic resin, houses a battery 6 as a power source inside, and a buzzer 8 connected to the battery 6 separately through an electric circuit 7. and buzzer circuit automatic changeover switches 9 and 10 are provided as shown in FIG. The lower end of the rod 12 faces directly above the switch 9, and the pressing seat piece 14 attached to the lower end of the connecting rod 12 is attached to the second
As shown in the figure, when the rope 1 is in a slack state, it is pressed against the switch 9 to keep it open. An inner cavity 15 having a leak-shaped bottom is provided, and a bell ring 17 having a slightly larger diameter than the inner diameter of the opening 16 provided at the center of the bottom is housed in this inner cavity, so that the bell round 17 is inserted into the opening 16. When fitted, the weight of the bell ring 17 cuts the switch 10 directly below, and when the mantle frame 4 falls sideways as shown in Fig. 2 and the rope 1 is slack, the bell ring 17 As shown in FIG. 2, since the lumen 15 has moved laterally from the position of the bottom aperture 16 and is out of the aperture, the switch 10 remains turned off, and the buzzer circuit is therefore opened. If the rope 1 is suspended vertically as the boom is raised as shown in Fig. 1, the switches 9 and 10 of the buzzer circuit will be closed as shown in Fig. 3. An alarm will start to sound. In this way, the mantle frame 4 connected to the rope automatically makes the buzzer sound or stops the buzzer depending on the tension or loosening of the rope 1.

Effects of the invention Since the present invention is configured as described above, there is no need to constantly monitor the condition of the rope as in the case of conventional methods, and when the boom approaches a power transmission line, the situation is detected by an alarm system. Since it is possible to automatically detect the occurrence of crane accidents, it is effective in preventing crane accidents.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the state in which the present invention is applied to a crane truck, Figure 2 is a cross-sectional view of a cannula with an internal alarm buzzer, and Figure 3 is an illustration of the automatic switch when the cannula is held vertically. The cross-sectional view showing the blockage, FIGS. 4 and 5, are explanatory diagrams of electrical circuit connections showing the opening and closing of the switch. 1... Rope, 2... Crane truck, 3... Boom, 5... Mantle frame, 6... Battery, 7... Electric circuit,
8... Buzzer, 9... Switch, 10... Switch, 11... Ring, 12... Connecting rod, 13... Coil spring, 14... Pressing seat piece, 15... Inner cavity, 1
6... open hole, 17... bell round.

Claims (1)

[Scope of utility model registration request] A battery is placed inside a mantle frame with an appropriate external shape
A buzzer is installed inside, and a switch that automatically opens and closes the circuit according to the ups and downs of the mantle is connected to the circuit connecting this battery and the buzzer, and a switch is connected to the head of the mantle.
A warning device for a crane, characterized in that the upper end is attached to the boom of a crane and the lower end of a rope of a required length is connected.