JP2545738Y2 - Mobile crane intercom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a communication device for a mobile crane.

[0002]

2. Description of the Related Art As shown in FIG. 5, a mobile crane has a crane operating room 1 and a swing table 3 which is swingably mounted on a vehicle 2 and a hanging tool 4 is hung up and down at the end thereof. A telescopic boom 5 is mounted so as to be able to move up and down, and is configured to control the hoisting and lowering movement of the hanger 4, the turning movement of the swivel base 3, and the undulation and extension and contraction movement of the telescopic boom 5 from the crane cab 1. doing. In order to ensure the safety of the crane operation of this type of mobile crane, the crane operator in the crane operator's cab 1 checks the state of slinging on the hoisting tool 4 (the state in which the hanging load is hung on the hoisting tool 4). Is what you do. For this reason, when the hanger 4 is blocked by a building or the like and cannot be visually recognized directly from inside the crane cab 1, a slinger who removes a load from the hanger 4 at a position near the hanger 4 sounds. The portable crane has a portable transmitting device 6 that converts the signal into a radio signal and transmits the radio wave, and a receiving device 7 that receives the radio wave from the transmitting device 6 and outputs the sound in the crane operating room 1. The slinger transmits the slinging state to the crane operator via the transmitting device 6 and the receiving device 7.

[0003] In this type of wireless communication device comprising a transmitting device 6 and a receiving device 7, a receiving antenna 7 a of the conventional receiving device 7 is arranged at an appropriate position in the crane cab 1 or the swivel 3. The portable transmitting device 6
There is a problem that a shield such as a building easily exists between the receiving antenna 7a of the receiving device 7 and the radio wave is hard to reach in that case. To cope with this problem, it is conceivable to increase the intensity of the transmitted radio wave of the transmitting device 6, but the increase in the intensity of the transmitted radio wave is severely restricted by the recently revised Radio Law.

[0004]

[Problems to be solved by the present invention]
It is an object of the present invention to provide a novel mobile crane communication device in which there is almost no shielding such as a building between the transmitting device 6 and the receiving antenna 7a in consideration of the arrangement position of the receiving antenna 7a. is there.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a communication device for a mobile crane according to the present invention is configured as follows. A swivel 3 provided with a crane operating room 1 and rotatably mounted on a vehicle 2 is provided with a telescopic boom 5 having a lifting tool 4 lifted and lowered so as to be freely raised and lowered at the end thereof. 1 is a communication device of a mobile crane configured to control the hoisting and lowering movement of the hanging tool 4, the swiveling movement of the swivel base 3, and the undulation and extension and retraction of the telescopic boom 5; And a receiving device 7 attached to a mobile crane that receives a radio wave from the transmitting device 6 and outputs a sound in the crane operating room 1. A receiving antenna 7a disposed at the distal end of the telescopic boom 5 for receiving a radio wave transmitted from the transmitting device 6, a cord winder disposed at the distal end or the proximal end of the telescopic boom 5; High-frequency signal transmitting means for transmitting a high-frequency signal received by the receiving antenna 7a to the proximal end of the telescopic boom 5 including a cord stretched between the distal end and the proximal end of the telescopic boom 5; Demodulating means attached to the base end of the crane operating room 5 or the crane operating room 1 for demodulating a high-frequency signal transmitted to the base end side of the telescopic boom 5 via the high-frequency signal transmitting means into a low-frequency signal; Or a voice output means disposed in the crane cab 1 for outputting a low-frequency signal from the demodulation means by voice. The receiving device 7 is disposed at a tip end of a telescopic boom 5 to transmit the signal. A receiving antenna 7a for receiving a radio wave transmitted from the device 6, a demodulating means disposed at the tip of the telescopic boom 5 for demodulating a high-frequency signal received by the receiving antenna 7a into a low-frequency signal, A low frequency signal from the demodulating means, including a cord wound around a cord winder disposed at the distal end or the proximal end of the telescopic boom 5 and stretched between the distal end and the proximal end of the telescopic boom 5; A low-frequency signal transmitting means for transmitting the signal to the operator's cab 1; and a crane operating room 1 disposed in the crane operating room 1 and via the low-frequency signal transmitting means.
It is constituted by voice output means arranged in the crane cab 1 for outputting a low-frequency signal transmitted to the inside by voice.

[0006]

In the communication device of the mobile crane according to the present invention having the above-described structure, the receiving antenna 7a of the receiving device 7 is attached to the tip of the telescopic boom 5 on which the hanging device 4 is suspended. There is almost no interference between the portable transmitting device 6 carried by the slinger at the position and the receiving antenna 7a of the receiving device 7, and thus the radio wave from the transmitting device 6 is transmitted to the receiving antenna 7a of the receiving device 7. The problem that it is hard to reach does not arise.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a communication device for a mobile crane according to the present invention will be described below with reference to FIGS. Since the communication device of the mobile crane of the present invention has a different configuration of the receiving device 7 as compared with the conventional communication device, the code used in the communication device of the conventional mobile crane shown in FIG. ,
Except for this point, the same is used in the following description.

(First Embodiment) In FIG. 1, a receiving device 7 arranged on a mobile crane is shown.
Is a receiving antenna 7a arranged at the distal end of the telescopic boom 5 for receiving the transmission radio wave from the transmitting device 6, and a cord winder 8 disposed at the base end of the telescopic boom 5 to be wound around the telescopic boom 5. High frequency signal transmitting means 7 including a cord 9 stretched between a distal end and a proximal end and transmitting a high frequency signal received by the receiving antenna 7a to the proximal end of the telescopic boom 5
b, a demodulating means 7c which is attached to the base end of the telescopic boom 5 or the crane cab 1 and demodulates a high frequency signal transmitted to the base end of the telescopic boom 5 via the high frequency signal transmitting means 7b into a low frequency signal. And a voice output means 7d disposed in the crane cab 1 and disposed in the crane cab 1 and outputting a low-frequency signal from the demodulation means 7c as a voice. The cord 9 wound around the cord winder 8 is formed of a shielded wire so that the cord 9 does not receive noise radio waves. A suitable low frequency amplifying means (not shown) is provided between the demodulating means 7c and the audio output means 7d.

In the first embodiment, the receiving antenna 7a
And demodulating means 7c (the audio signal superimposed on the high-frequency signal,
The signal is demodulated to a low frequency signal. ) Includes a cord 9 wound around a cord winder 8 disposed at the base end of the telescopic boom 5 and stretched between the distal end and the base end of the telescopic boom 5, and the receiving antenna 7a receives the data. High-frequency signal transmitting means 7 for transmitting the converted high-frequency signal to the proximal end side of the telescopic boom 5
The connection is made by b.

In the first embodiment, an example is shown in which the cord winder 8 is disposed at the base end of the telescopic boom 5, but this cord winder 8 is attached to the distal end of the telescopic boom 5. Of course, it may be. In this case, as shown in FIG. 2, a receiving antenna 7a is attached to a winding drum 8a of a cord winder 8 disposed at the tip of the telescopic boom 5, and the winding side end of the cord 9 is connected to the receiving antenna 7a. Then, if the receiving antenna 7a and the demodulating means 7c are connected without interposing a rotary brush,
The reliability of the transmission of the high-frequency signal by the high-frequency signal transmission means 7b can be improved. In the first embodiment, the demodulation means 7c is arranged in the crane cab 1, but the demodulation means 7c may be attached to the base end of the telescopic boom 5.

(Second Embodiment) In FIG. 3, a receiving device 7 is disposed at the tip of the telescopic boom 5 and receives a radio wave transmitted from the transmitting device 6. A demodulating means 7c disposed to demodulate a high-frequency signal received by the receiving antenna 7a to a low-frequency signal; a demodulating means 7c wound around a cord winder 8 disposed at a base end of the telescopic boom 5; A low-frequency signal transmitting means 7e including a cord 9 stretched between the ends to transmit a low-frequency signal from the demodulating means 7c into the crane cab 1; It comprises a voice output means 7d arranged in the crane cab for outputting a low-frequency signal transmitted to the crane cab 1 via the signal transmission means 7e. An appropriate low frequency amplifying means (not shown) is provided between the demodulating means 7c and the low frequency signal transmitting means 7e or between the low frequency signal transmitting means 7e and the audio output means 7d.

In the second embodiment, a demodulating means 7c (for demodulating an audio signal superimposed on a high-frequency signal into a low-frequency signal, disposed at the end of the telescopic boom 5; The means supplied to the distal end of the telescopic boom 5 by means is used), and the cord is taken up by the cord winder 8 arranged at the base end of the telescopic boom 5 to
And a low-frequency signal transmitting means 7e for transmitting a low-frequency signal from the demodulating means 7c to an audio output means 7d in the crane cab 1 including a cord 9 stretched between the distal end and the base end of the crane. I have to.

In the second embodiment, the cord winder 8 is arranged at the base end of the telescopic boom 5, but the cord winder 8 is attached to the distal end of the telescopic boom 5. Of course, it may be. In this case, the receiving antenna 7 arranged at the tip of the telescopic boom 5 as shown in FIG.
a and the demodulating means 7c are attached to the winding drum 8a of the cord winder 8, and the output of the demodulating means 7c is
Is connected to the take-up side end of the device and connected to the demodulation means 7c and the audio output means 7d without the intervention of a rotary brush, the reliability of transmission of the low-frequency signal by the low-frequency signal transmission means 7e can be improved. Can be enhanced. In the case of the second embodiment, since the transmission of the signal between the distal end and the proximal end of the telescopic boom 5 is performed by a low-frequency signal, the shield wire need not be used for the cord 9 as a matter of course. It is.

[0014]

The communication device of the mobile crane according to the present invention having the above-described structure is configured such that the receiving antenna 7a of the receiving device 7 is
Since the shield is disposed at the tip of the telescopic boom 5 where it is difficult for the shield to intervene with the portable transmitting device 6 carried by the slinger located in the vicinity of the slingers 4, the slinger can be moved from the slinger to the crane operator. It has an excellent effect that a call can be made reliably.

[Brief description of the drawings]

FIG. 1 is a first view of a communication device of a mobile crane according to the present invention.
FIG.

FIG. 2 is an explanatory diagram of another embodiment of the cord winder in the communication device of FIG. 1;

FIG. 3 is a second view of the communication device of the mobile crane according to the present invention.
FIG.

FIG. 4 is an explanatory view of another embodiment of the cord winder in the communication device of FIG. 3;

FIG. 5 is an explanatory view of a communication device of a conventional mobile crane.

[Description of Signs] 1 Crane operation room 2 Vehicle 3 Turning table 4 Hanging device 5 Telescopic boom 6 Transmitting device 7 Receiving device 7a Receiving antenna 7b High frequency signal transmitting means 7c Demodulating means 7d Audio output means 7e Low frequency signal transmitting means 8 Cord winding Remover 9 code

Claims (2)

(57) [Scope of request for utility model registration] 1. A crane cab having a crane cab and a telescopic boom having a hanger lifted and lowered so as to be undulatingly mounted on a tip of a swivel that is rotatably mounted on a vehicle. From above, it is a communication device of a mobile crane configured to control the hoisting and lowering movement of the hoist, the swiveling movement of the swivel, and the undulation and telescopic movement of the telescopic boom, and convert the voice into a radio signal. A portable transmitting device that transmits radio waves, and a receiving device attached to a mobile crane that receives radio waves from the transmitting device and outputs sounds in the crane cab, wherein the receiving device is a distal end of a telescopic boom. A receiving antenna arranged to receive a transmission radio wave from the transmitting device, a retractable boom of a telescopic boom wound around a cord winder disposed at a distal end or a proximal end of the telescopic boom. High-frequency signal transmission means including a cord stretched between an end and a base end for transmitting a high-frequency signal received by the receiving antenna to the base end side of the telescopic boom, attached to a base end of the telescopic boom or a crane cab. Demodulating means for demodulating a high-frequency signal transmitted to the base end side of the telescopic boom via the high-frequency signal transmitting means into a low-frequency signal, and a voice output of the low-frequency signal from the demodulating means disposed in the crane cab. And a voice output means disposed in the crane cab. 2. A crane cab having a crane cab and a telescopic boom on which a lifting tool is lifted and lowered so as to be freely rotatable is attached to a tip of the turntable which is rotatably mounted on a vehicle. From above, it is a communication device of a mobile crane configured to control the hoisting and lowering movement of the hoist, the swiveling movement of the swivel, and the undulation and telescopic movement of the telescopic boom, and convert the voice into a radio signal. A portable transmitting device that transmits radio waves, and a receiving device attached to a mobile crane that receives radio waves from the transmitting device and outputs sounds in the crane cab, wherein the receiving device is a distal end of a telescopic boom. A receiving antenna disposed at the front end of a telescopic boom for receiving a radio wave transmitted from the transmitting device, and demodulating a high frequency signal received by the receiving antenna to a low frequency signal. Demodulating means, including a cord wound around a cord winder disposed at a distal end or a proximal end of the telescopic boom and stretched between a distal end and a proximal end of the telescopic boom, and a low frequency signal from the demodulating means. A low-frequency signal transmitting means for transmitting a signal to the crane cab; and the crane operation arranged in the crane cab and outputting a low-frequency signal transmitted to the crane cab via the low-frequency signal transmitting means as a voice. A communication device for a mobile crane, characterized by comprising audio output means arranged in a room.