JP2001139282A - Boom unhoused state warning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To house a boom without delay by warning an operator of the unhoused state of a boom before returning to an operator's cab. SOLUTION: In this boom unhoused state warning device, a boom unhoused state detecting switch 13 for closing a circuit in a boom unhoused state, and an outrigger housed state detecting switch 14 for closing the circuit in an outrigger housed state, are connected in series to a warning circuit 12 for connecting a boom unhoused state warning buzzer 10 to a power source 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane mounted on a vehicle, and more particularly to a boom non-storing alarm device for issuing an alarm when the boom is not stored in a predetermined storage position.

[0002]

2. Description of the Related Art As shown in FIG. 2, a vehicle-mounted crane 1 is mounted on a chassis 5 between a cab 3 and a carrier 4 of a vehicle 2. In the crane 1, a column 8 is rotatably provided on a base 7 having an outrigger 6, and a boom 9 is pivotally supported on the upper end of the column 8 so as to be able to move up and down. The boom 9 is a multi-stage telescopic boom.

Usually, such a vehicle-mounted crane 1 is used.
Is used as follows: The operator drives the vehicle 2 to travel to a place where the cargo work is performed, applies the parking brake of the vehicle 2 to a parking state, puts in a power take-off (hereinafter, referred to as PTO), and turns on the hydraulic pump that is the power of the crane 1. Drive. Next, after going out of the cab 3 and going to the place of the crane 1, the outrigger 6 is first extended to secure the stability of the vehicle 2, and the crane operation is enabled. Perform crane work.

[0004] When the crane operation is completed, all the operating members of the crane 1 such as the boom 9 and the outrigger 6 are stored, the operation returns to the cab 3, and the PTO is cut off to drive the hydraulic pump which is the power source of the crane 1. The vehicle is stopped, and finally, the parking brake is released, and the vehicle 2 travels to the next destination. Table 1 shows the states of the parking brake, the PTO, the outrigger 6, and the boom 9 in the above steps.

[0005]

[Table 1]

When the vehicle 2 is traveling, it is necessary that the outrigger 6 is retracted and the parking brake is released. Also, the boom 9 is completely reduced,
It must be stored in a storage position with the front end facing forward or just behind as shown. With the parking brake on or the outrigger 6 extended, the vehicle 2
It is not usually possible to drive. However, boom 9
Is stored, the vehicle 2 can travel.
There is a possibility that the operator forgets to store the boom 9 and runs the vehicle 2 with the boom not stored.

Therefore, the vehicle-mounted crane 1 is provided with a boom non-storing alarm device that issues an alarm when the boom is not stored in the storage position. A conventional boom non-storage alarm device is configured as shown in FIG.
In this boom non-storing alarm device, an alarm circuit 32 connecting the boom non-storing alarm buzzer 30 and the power supply 31 has
A normally closed relay 33 and a normally open relay 34 are provided. A coil of the normally closed relay 33 includes a parking brake switch 35, a parking brake lamp 36, and a normally open relay 34.
A boom non-storing detection switch 37 is connected to each of the coils.

Here, the boom non-storing detection switch 37 is provided on the crane 1 side, and all other devices are provided in the cab 3 of the vehicle 2. Parking brake switch 3
5 is on when the brake is on, and on when the brake is released
off. The boom non-storing detection switch 37 is turned on when the boom is not stored, and turned off when the boom is stored.

Accordingly, when the parking brake is on, the boom non-storing alarm buzzer 30 does not generate an alarm regardless of whether the boom 9 is in the retracted state or in the non-storing state. The buzzer 30 issues an alarm to notify the operator that the boom 9 is not stored. Whether the boom is stored or not stored is detected by a detection means (not shown) of the boom 9 at the most reduced position, the most lowered position, the position immediately before or the position immediately after the boom 9.

[0010]

In the conventional boom non-storing alarm device, if the boom is not stored when the parking brake is released, the boom non-storing alarm buzzer 30 issues an alarm. It is possible to prevent the vehicle 2 from running. However, when the operator notices that the boom 9 is not retracted by the alarm when the operator returns to the driver's cab 3 and turns off the PTO and releases the parking brake, the PT must be retracted again in order to retract the boom 9.
After inserting O, it is necessary to move out of the cab 3 and move to the crane 1.

Since the boom non-storage warning device is linked to the parking brake switch, it is necessary to guide the electric wiring from the crane 1 to the cab 3 and to modify the electric wiring in the cab 3. The content of the modification differs depending on the type of the vehicle 2 on which the crane 1 is mounted. Moreover, there is a problem that the structure is complicated, the number of parts is increased, and the cost is high.

The present invention solves the above-mentioned problem in the boom non-storing alarm device, and can alert the operator of the non-storing state of the boom before returning to the operator's cab.
An object of the present invention is to provide a boom non-storing alarm device which does not require modification of electric wiring in a cab, can reduce the number of assembling steps during mounting, has a simple structure, has a small number of parts, and is inexpensive.

[0013]

SUMMARY OF THE INVENTION According to the present invention, there is provided a boom non-retractable alarm device having an alarm device for issuing an alarm when a crane boom is in a non-retracted state. This problem is solved by connecting a boom non-storing detection switch that closes when the boom is not stored and an outrigger storing detection switch that closes when the outrigger is stored in series.

This boom non-storing alarm issues an alarm if the boom is not stored when the outrigger is stored, so the operator notices that the boom is not stored before returning to the cab and stores the boom. be able to. By providing the alarm, the boom non-storing detection switch, and the outrigger storage detecting switch on the crane side, it is not necessary to modify the electric wiring in the cab, and the number of assembling steps during mounting can be reduced.

[0015]

FIG. 1 is an electric circuit diagram showing a configuration of a boom non-storing alarm device according to an embodiment of the present invention. Since the configuration of the crane is the same as that of the conventional crane, the same parts will be described with the same reference numerals with reference to FIG.

The vehicle-mounted crane 1 is mounted on a chassis 5 between a driver's cab 3 of a vehicle 2 and a carrier 4. In the crane 1, a column 8 is rotatably provided on a base 7 having an outrigger 6, and a boom 9 is pivotally supported on the upper end of the column 8 so as to be able to move up and down. The boom 9 is a multi-stage telescopic boom. Usually, such a vehicle-mounted crane 1 is used as follows.

The operator drives the vehicle 2 to travel to a place where cargo handling work is performed, puts the vehicle 2 in a parking state by applying a parking brake, puts in PTO, and drives a hydraulic pump which is the power of the crane 1. Next, the driver goes out of the operator's cab 3 and goes to the place of the crane 1. First, the outrigger 6 is extended to secure the stability of the vehicle 2, and the crane operation is enabled.
The crane work is performed while turning, raising and lowering, and expanding and contracting the boom 9.

When the crane operation is completed, all the operating members of the crane 1 such as the boom 9 and the outrigger 6 are stored, and then the operation returns to the operator cab 3 where the PTO is cut off to drive the hydraulic pump which is the power source of the crane 1. The vehicle is stopped, and finally, the parking brake is released, and the vehicle 2 travels to the next destination. When the vehicle 2 travels, it is necessary that the outrigger 6 is retracted and the parking brake is released. Also, boom 9
Must be completely retracted, fully collapsed, and stored in a storage position with the tip facing directly forward or as shown.

As shown in FIG. 1, the boom non-storage alarm device includes a boom non-storage alarm buzzer 10 as an alarm device. A boom non-storage detection switch 13 and an outrigger storage detection switch 14 are connected in series in an alarm circuit 12 connecting the boom non-storage alarm buzzer 10 and the crane main power supply line 11. Here, the boom non-storing alarm buzzer 10 and the boom non-storing detection switch 1
3 and an outrigger storage detection switch 14 are provided on the crane 1 side, and the crane main power supply line 11 is connected to the power supply 3 on the vehicle 2 side.

The boom non-storing detection switch 13 turns on when the boom is not stored and turns off when the boom is stored.
The outrigger storage detection switch 14 is turned on in the outrigger storage state and turned off in the outrigger extended state. Therefore, in the state where the outrigger 6 is extended, the boom non-storing alarm buzzer 10 does not generate an alarm regardless of whether the boom 9 is in the retracted state or the non-storing state. 10 issues an alarm to inform the operator that the boom 9 is not stored. Therefore, before returning to the operator's cab 3, the operator can notice that the boom 9 is not stored and store the boom 9.

It should be noted that it is only necessary to judge whether the boom 9 is stored or not and issue an alarm from the end of the crane operation to the time when the operator returns to the cab 3. The switch 14 may detect the outrigger storage state at any time from the start of the storage operation of the outrigger 6 to the end of the storage of the outrigger 6. Therefore, the outrigger storage detection switch 14 can be appropriately selected from a switch that detects a storage operation of the outrigger 6, a limit switch that detects that the outrigger 6 has reached the storage position, and the like.

Whether the boom is stored or not stored is determined by
The boom 9 is detected by a detection means (not shown) at the most reduced position, the most lowered position, the position immediately before or the position immediately after the boom 9. As a detection location and detection means for detecting whether or not the boom 9 is in the retracted state, whether or not the outrigger 6 is in the retracted state, a limit switch is usually provided on one of the relatively moving members, and the movement (displacement) of the other member is provided. There is a method of mechanically detecting the state, but any detection place may be used as long as a required state can be detected. The detection means may be any means such as an electric or hydraulic detection means in addition to the mechanical means. May be used.

In this boom non-storing alarm device, when the outrigger 6 is retracted in the boom non-storing state, the boom non-storing alarm buzzer 10 issues an alarm. The boom 9 can be stored by noticing that it is a storage, and there is no need to move between the cab 3 and the crane 1 many times to store the boom 9.

Further, since the boom non-storing alarm buzzer 10, the boom non-storing detecting switch 13 and the outrigger storing detecting switch 14 are provided on the crane 1, there is no need to modify the electric wiring in the cab 3. In addition, the number of assembling steps during mounting can be greatly reduced. Since the alarm circuit 12 is configured separately from the electric circuit of the vehicle 2, the alarm circuit 12 does not affect the electric circuit of the vehicle 2 and maintenance and inspection are easy. Moreover, the structure is simple, the number of parts is reduced, and the cost is reduced.

[0025]

As described above, the boom non-storing alarm device of the present invention issues an alarm if the boom is in the non-storing state when the outrigger is stored, so that the operator does not store the boom before returning to the cab. And store the boom. By providing the alarm, the boom non-storing detection switch, and the outrigger storage detecting switch on the crane side, it is not necessary to modify the electric wiring in the cab, and the number of assembling steps during mounting can be reduced.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing a configuration of a boom non-storing alarm device according to an embodiment of the present invention.

FIG. 2 is a side view of the vehicle-mounted crane.

FIG. 3 is an electric circuit diagram showing a configuration of a conventional boom non-storing alarm device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane 2 Vehicle 3 Operator's cab 4 Backpack 5 Undercarriage 6 Outrigger 7 Base 8 Column 9 Boom 10 Boom non-storing alarm buzzer 11 Crane main power line 12 Alarm circuit 13 Boom nonstoring detection switch 14 Outrigger storage detecting switch 15 Power supply

Claims (2)

[Claims] 1. A boom non-retractable alarm device having an alarm device for issuing an alarm when a crane boom is in a non-retracted state. A boom non-storing detection switch for closing,
A boom non-storing alarm device, wherein an outrigger storage detection switch that closes in an outrigger storage state is connected in series. 2. The boom non-storage alarm device according to claim 1, wherein an alarm, a boom non-storage detection switch, and an outrigger storage detection switch are provided on the crane side.