JP2000026073A - Communication device for crane with luffing jib - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a luffing jib from being reassembled due to failed communication cable connection between the front end and the base end of the luffing jib, in a communication device for crane with the luffing jib. SOLUTION: A transmitter receiver 5a disposed on the base end side of a luffing jib is provided with a discriminating means 15 discriminating that it has received its own transmission signal. In the case of no connection of a jib stage to be connected, dummy connectors 7c, 7c, 8c, 9c, 10c, 11c connecting its 2-circuit to connectors 7a, 7b, 8a, 9a, 10a, 11a disposed on the front side of the jib stage. In connecting the jib stage to be connected, the dummy connectors 7c, 7c, 8c, 9c, 10c, 11c are removed, and the connectors 7b, 8b, 9b, 10b, 11b of the jib stage to be connected are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for a crane provided with a luffing jib.

[0002]

2. Description of the Related Art A crane provided with a luffing jib of this type is constructed as shown in FIG. That is, the telescopic boom 3 is arranged on the vehicle 1 so as to be able to undulate, and a luffing jib 4 is provided at the end of the telescopic boom 3 to which a plurality of jib stages are detachably connected. Roughing jib 4
Proximal jib 41, a plurality of intermediate jibs 42, 43, 44, 4
5. It consists of a tip jib 46.

[0003] Transmitters 5a and 5b are arranged at the proximal end jib 41 and the distal end jib 45, respectively, and a wired cable 6 having at least two circuits (hereinafter, referred to as a cable 6) is connected between them. To communicate with each other. That is, as shown in FIG. 4, the transmitter / receiver 5a includes an information processing device 51a, a transmitter 52a, and a receiver 53a, and when transmitting information from the information processing device 51a to the transmitter / receiver 5b, a signal is transmitted by the transmitter 52a. The signal transmitted and received from the transceiver 5b is received by the receiver 53a, and the received signal is output to the information processing device 51a. The signal transmitted by the transceiver 5a is received by the transceiver 5b via one circuit of the cable 6, and the signal transmitted by the transceiver 5b is received by the transceiver 5a via the other circuit of the cable 6.
To transmit information between the distal end side and the proximal end side of the luffing jib 4.

[0004]

By the way, the roughing jib 4 has a base end jib 41 connected to the distal end of the telescopic boom 3, and then the intermediate jib 42, 43, 44, and 45 are sequentially connected. The assembly of the luffing jib 4 is completed by connecting the tip jib 46. Accordingly, as shown in FIGS. 5 and 6, the cables 6 can be connected and disconnected at each jib stage so that connectors 7a, 7b, 8a, 8b, 9a, 9b can be connected to each other at a connection portion of each jib stage. , 10
a, 10b, 11a, and 11b.

Therefore, when assembling each shib step to the end of the telescopic boom 3 sequentially, the connectors 7a, 7
b, 8a, 8b, 9a, 9b, 10a, 10b, 11
a, 11b are connected in sequence, and the final connectors 11a, 11b are connected.
When b is connected, it is possible to determine whether the transceivers 5a and 5b are connected by the cable 6 and the connection between the transceivers 5a and 5b is normally connected. That is, the connectors 7a, 7b, 8a, 8b, 9a, 9b, 10
a, 10b are connected (connectors 11,
11b), the transmitter / receiver 5a transmits a signal but does not receive a signal from the transmitter / receiver 5b, so that the connection state of the cable 6 cannot be determined. Therefore, the last connector 11
When the connection between a and 11b is completed, it is determined that the connection is not normal due to poor contact of the cable 6 or disconnection.

However, at this time, if it is determined that the connection is not normal due to poor contact or disconnection of the cable 6, etc.,
Until now, it was necessary to disassemble based on the assembly of each jib stage to find out the location of the failure and repair it. That is, the work of connecting the jib stages and assembling the luffing jib 4 requires a lot of work, but reassembling the luffing jib 4 due to the poor connection of the cable 6 wastes the work so far. . In addition, although the jib stages are often connected to complete the assembly of the luffing jib 4, the luffing jib 4 may be assembled by forgetting the connection of the connector during the assembly. Also in this case, it was necessary to reassemble the luffing jib 4 as a connection failure of the cable 6. An object of the present invention is to provide a communication device for a crane provided with a luffing jib that solves the above-mentioned problems.

[0007]

In order to achieve the above object, a communication device for a crane having a luffing jib according to the present invention comprises a plurality of jib stages which can be detachably attached to a tip of a boom which can be freely raised and lowered on a vehicle. A crane equipped with a connected luffing jib has a connector in which a transmitter / receiver is arranged on the boom side or the luffing jib base side and a luffing jib tip side, respectively, and a cable having at least two circuits between the two is arranged at a detachable portion of each jib stage. In a communication device of a crane provided with a luffing jib that is connected and arranged through and performs two-way communication, the transceiver arranged on the boom side or the luffing jib base end side includes:
A judging means for judging that the own transmission signal has been received is provided, and a dummy connector for connecting the two circuits is connected to a connector arranged at the end of the jib when the next jib is not connected. When the next jib is connected, the dummy connector is removed to connect the connector of the next jib.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A communication device for a crane provided with a luffing jib according to the present invention will be described with reference to FIG. Reference numerals 1 to 6, reference numeral 5a, reference numeral 5b, reference numeral 7a, reference numeral 7b, reference numeral 8a, reference numeral 8b, reference numeral 9a, reference numeral 9b, reference numeral 10a, reference numeral 10 used in the description of the prior art.
b, 11a, 11b, 51a, 52
a and 53a are used in the following description as the same thing, and detailed description is omitted.

In FIG. 1, 7c, 8c, 9c, 10
Reference numerals c and 11c denote dummy connectors, each of which has four jib stages.
1, 42, 43, 44, 45 are respectively connected to connectors 7a, 8a, 9a, 10a, 11a arranged on the distal end side, and internally connect two circuits of the cable 6.

In FIG. 2, reference numeral 15 denotes a discriminating means, which comprises a discriminator 16 and a display 17. The discriminator 16 converts the signal transmitted by the transmitter 52a into a receiver 53a.
Is a discriminator for discriminating the reception. Display 17
Is a display for displaying when a signal from the discriminator 16 is received, and is constituted by a lamp such as an LED.

[0011] The communication device of the crane provided with the luffing jib of the present invention configured as described above operates as follows. When the proximal jib 41 is connected to the distal end of the telescopic boom 3, the dummy connector 7c is connected to the connector 7a.
Determines that the signal transmitted by the transmitter 52a has been received by the receiver 53a, and the display 17 receives the signal from the determiner 16 and displays (turns on the LED). From this display, it can be determined that the cable 6 is normally connected up to the connector 7a. If the display 17 is not displayed, it is determined that there is a poor connection between the transmitter / receiver 5a and the connector 7a, and a check is made during this time to find and repair the defective part.

Next, the intermediate jib 42 is connected to the base jib 41, the dummy connector 7c is removed from the connector 7a, and the connector 7b arranged on the base end side of the intermediate jib 42 is connected to the connector 7a. Since the dummy connector 8c is connected to the connector 8a disposed on the distal end side of the intermediate jib 42, the discriminator 16 of the transceiver 5a determines that the signal transmitted by the transmitter 52a has been received by the receiver 53a. The display 17 receives the signal from the discriminator 16 and displays (turns on the LED). With this display, the cable 6
Can be determined that the connector 8a is normally connected. If the display 17 is not displayed, it is determined that there is a poor connection between the connector 7a and the connector 8a, and a check is made during this period to find and repair the defective part.

Similarly, when the next jib is connected to the intermediate jib, the next jib is connected while judging whether or not the connection state of the connected jib is normal. 46 is connected to connect the transceiver 5b to determine whether the connection status is normal. As described above, it is possible to determine whether or not the cable 6 connected by the connected jib stage is normally connected each time each jib stage is connected. It is said that the ruffing jib 4 is reassembled due to a poor connection of the cable 6. Wasteful work can be eliminated.

Further, it is possible to prevent the connection of the connector from being forgotten during the assembly of the luffing jib 4.
Further, the dummy connectors 7c, 8c, 9c, 10c, 1
1c can serve as a waterproof plug for each connector 7a, 8a, 9a, 10a, 11a when separating and storing each jib stage.

In the above embodiment, the transmitter 52a is arranged on the base jib 41, but may be arranged on the telescopic boom 3 side. Further, in the above embodiment, the cable 6 is described as a wired cable, but may be an optical fiber cable. Further, when the cable 6 is not properly connected, the display 17 is displayed, but an alarm may be issued by an alarm or the like.

[0016]

The communication device for a crane provided with the luffing jib of the present invention constructed and operated as described above can eliminate a wasteful operation of reassembling the luffing jib due to poor connection of the cable.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating a communication device of a crane provided with a luffing jib of the present invention, and shows a state before assembling the luffing jib.

FIG. 2 is an explanatory view illustrating a communication device of a crane provided with a luffing jib of the present invention, and is an explanatory view illustrating a transmitter / receiver arranged on a telescopic boom side or a jib base end side.

FIG. 3 is an explanatory diagram illustrating a crane provided with a luffing jib.

FIG. 4 is an explanatory view illustrating a communication device of a crane provided with a conventional luffing jib, and is an explanatory view illustrating a transmitter / receiver arranged on a telescopic boom side or a jib base end side.

FIG. 5 is an explanatory view illustrating a communication device of a crane provided with a conventional luffing jib, and shows a state before the luffing jib is assembled.

FIG. 6 is an explanatory view illustrating a communication device of a crane provided with a conventional luffing jib, and shows a state after the luffing jib is assembled.

[Explanation of symbols]

 1 vehicle 3 telescopic boom 4 luffing jib 5a transceiver 5b transceiver 6 cable 7a connector 8a connector 9a connector 10a connector 11a connector 7b connector 8b connector 9b connector 10b connector 11b connector 7c dummy connector 10c dummy connector 9c dummy connector 10c dummy connector 9c dummy connector 10c 15 Discriminating means

Claims (1)

[Claims] 1. A crane provided with a luffing jib in which a plurality of jib stages are detachably connected to a tip of a boom arbitrarily disposed on a vehicle, and a transmitter / receiver is provided on a boom side or a luffing jib base end and a luffing jib tip side. And a communication device for a crane including a luffing jib configured to perform bidirectional communication by connecting a cable having at least two circuits therebetween through a connector arranged at a detachable portion of each jib stage. The transmitter / receiver arranged on the boom side or the base end side of the luffing jib is provided with a judging means for judging that the own transmission signal has been received, and when the jib stage to be connected next is not connected, the jib stage is not connected. Connect the dummy connector that connects the two circuits to the connector located on the tip side, and then connect the jib to be connected Cranes of a communication device provided with the luffing jib, characterized in that the are so as to connect the connector of the jib stages are then coupled by removing the dummy connector in that.