JPH06255985A - Control device for crane - Google Patents

Abstract

PURPOSE:To enable the continuation of operation of a crane, even in the case where the operation system of the crane has failed, by providing the operation room with an electric main control system, and providing the machine body with a hydraulic driving system, and also by providing the machine body with a hydraulic emergency control system. CONSTITUTION:An electric main control system is provided to an operation room, and a control stand 22 fitted with a joint-stick type control lever is provided to the front inside of the operation room. The driving system provided to the machine body is of a hydraulic type, and first to fourth winch drums 17 to 20 are driven by hydraulic motors 37 to 40 through speed reducers 33 to 36 respectively. On the machine body side, a control box 46 equipped with a hydraulic control valve is provided as an emergency control system. The control box 46 is housed so as to be freely drawn out from the machine body, and in the case where the main control system in the operation room cannot be used due to the failure of the electric system or the like, the driving system can be operated by operating the control box 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane operating device, and more particularly to a mobile crane operating device having a driver's cab provided independently of a machine body.

[0002]

2. Description of the Related Art A large-sized mobile crane has a large aircraft body, which is restricted in transportation and a driver's cab is arranged outside the aircraft in order to secure a view when operating the crane. There is. An electric or hydraulic operation system is provided in the operator's cab, and is formed so as to control the drive system of the crane mounted on the machine body.

[0003]

In the conventional mobile crane, only one operating system is provided in the operator's cab, and if the operating system fails, the crane cannot be operated. In that case, work must be interrupted and the crane must be on standby until the repair of the operating system is completed. Therefore, even if a failure occurs in the operation system of the crane, there arises a technical problem to be solved in order to be able to continue the operation of the crane, and the present invention solves this problem. With the goal.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and in a mobile crane in which a driver's cab is provided independently of the machine body, an electric type is used in the operator's cab. The present invention provides an operating device for a crane, in which a main operation system is provided, a hydraulic drive system is provided on the machine body, and a hydraulic temporary operation system is provided on the machine body side.

[0005]

[Operation] The main operation system installed in the cab is of the electric type,
An operation signal is input to the control unit by operating a joystick or the like. The control unit sends an electric signal to the corresponding proportional control valve based on the input signal. The drive system provided on the machine side is a hydraulic type, and operates the directional control valve by operating the proportional control valve to drive the hydraulic motor to rotate the winch drum.

A hydraulic temporary operation system is provided on the machine body side. When the electric main operation system fails, the temporary operation control valve is operated to operate the drive system directional control valve. Rotate the winch drum.

[0007]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a mobile crane, and an upper revolving structure 12 is placed on a lower traveling structure 11 composed of a crawler or the like to form a machine body 13. The jib 14 is attached to the front part of the upper revolving structure 12, and the counterweight 15 is fixed to the rear part of the upper revolving structure 12. A driver's cab 16 is provided on the front side of the upper swing body 12 independently of the machine body 13.

FIG. 2 shows a plane of the machine body 13, and the first winch drum 17, the second winch drum 18, the third winch drum 19, and the fourth winch drum 17 are sequentially arranged from the front of the upper swing body 12.
A winch drum 20 of the engine 2 is provided between the second winch drum 18 and the third winch drum 19.
1 is installed. The main operation system provided in the driver's cab 16 is an electric type, a control stand 22 having a joystick-type operation lever attached is provided in front of the inside of the driver's cab 16, and an operation panel board 23 is provided on the side thereof. Has been done. Further, a cab-side control panel 24 and a moment limiter 25 are provided behind the cab 16.

On the cab side control panel 24, there are provided a control section for processing the operation signal of the operation lever of the control stand 22, and a proportional valve amplifier for amplifying a command signal transmitted from the control section to a proportional control valve described later. It is built in. On the other hand, a machine-side control panel 26 is installed on the upper revolving superstructure 12, and an electric cable 27 is connected between the machine-side control panel 24 and the cab-side control panel 24.
, To supply electric power between the machine body 13 and the operator's cab 16 and to transmit a command signal. Distribution board 28 in various places on the body 13,
28 are provided and the electric cables 29, 29 ... Are wired and connected to the machine side control panel 26. Reference numeral 30 is an engine power distribution board, and 31 is a breaker board. Further, the remote control operation panel 32 can be pulled out from the machine body side control panel 26 for remote operation.

As shown in FIG. 3, the drive system provided in the machine body 13 is of a hydraulic type, and the first to fourth winch drums 17 to 20 have hydraulic motors 37 via reduction gears 33 to 36, respectively. Driven by ~ 40. Each hydraulic motor 3
7 to 40 are rotated or stopped by the switching operation of the directional control valves 41 to 44, and as described above, the cab side control panel 2
Command signal from the control unit built in 4 is proportional control valve 4
5, 45, ..., The proportional control valve 45 that receives the command signal is activated to switch any of the directional control valves 41 to 44.

Here, as shown in FIGS. 2 and 3, on the side of the machine body 13, in addition to the electric main operation system, a control box 4 having a hydraulic control valve as a temporary operation system is provided.
6 is provided. As shown in FIG. 2, the control box 46 is retractably stored in the machine body 13.
When the main operation system of the cab 16 cannot be used due to a failure of the electric system or the like, the control box 46 can be operated to operate the drive system. Alternatively, even when the cab 16 is not yet attached during the assembly process of the mobile crane, the control box 4 for the temporary operation system is used.
It is possible to operate the drive system by 6.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0013]

As described in detail in the above one embodiment of the present invention, since two operation systems are installed, when an electrical failure occurs in the main operation system, a hydraulic system provided on the machine side is used. The drive system can be operated by the temporary operation system. Therefore, without interrupting the operation of the crane while repairing the main operating system,
The work can be continued, which contributes to the improvement of operability and the work efficiency.

[Brief description of drawings]

FIG. 1 is a side view of a mobile crane.

FIG. 2 is a plan view of the airframe.

FIG. 3 is a block diagram of an operating device.

[Explanation of symbols]

 13 Aircraft 16 Cab

Claims (1)

[Claims] 1. A mobile crane in which a driver's cab is provided independently of the machine body, an electric main operation system is provided in the operator's cab, a hydraulic drive system is provided in the machine body, and the machine side An operating device for a crane, characterized in that a hydraulic temporary operation system is installed in the.