JPS6316706Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cabin cooler device for a winch crane working machine such as a self-propelled crane vehicle.

Conventional drive means for a compressor for a cooler in a cabin cooler device in a self-propelled crane vehicle include a cooler drive hydraulic circuit for a boom hoisting, boom extension and retraction drive hydraulic path of a crane working machine, or a swing drive hydraulic circuit for a revolving superstructure. The drive hydraulic circuit of the compressor is connected, the drive pressure source (hydraulic pump) is shared, and the drive pressure fluid is controlled by a flow rate control valve and divided to be directed to the compressor drive hydraulic motor. There is.

In this conventional configuration, by using a common driving pressure source for boom raising, boom extension/retraction, and upper rotating structure, there is no need to separately install a driving pressure source for the cooler compressor, which is cost effective. Not only is it effective, but it is also effective because it does not consume the engine's rated output unnecessarily.

However, in the case of the above means, boom hoisting,
The cooler switch was turned on while the boom was being extended or retracted or the upper rotating structure was being rotated.
When the compressor turns on or off while the cooler is operating, the operating pressure fluid volume fluctuates and affects the above operating status, so the dynamic speed changes in the case of dynamics during crane boom hoisting, extension and contraction operations. This may cause a swinging effect on the suspended load, or may cause the suspended load to become misaligned during minute positioning, leading to an unexpected accident.

Therefore, during crane hoisting work, especially during crane hoisting work that requires fine manipulation, it is necessary to restrict the use of the cooler, which is inconvenient for the operator in hot weather.

The present invention was developed in consideration of the above problems, and attempts to improve the above problems by sharing the drive hydraulic power source of the cooler compressor with the hydraulic power source of the hydraulic circuit for controlling the clutch/brake operating pressure of the winch. It is something.

In other words, the winch clutch/brake is
The clutch/brake is not activated by the continuous load action of the drive pressure fluid flow, such as the crane boom hoisting and telescoping movements, but by creating and maintaining a predetermined hydraulic pressure in the clutch/brake operating circuit. The driving hydraulic circuit of the cooler compressor is connected to the clutch/brake circuit of the winch, focusing on the point that the operating state is obtained and the pressure fluid above a predetermined pressure is relieved.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1a and 1b are main and sub brake devices of the winch device, 2a and 2b are main and sub clutch devices, and the brake devices 1a and 1b are released by the hydraulic pressure acting on the hydraulic chamber 3, and the spring It is designed to be activated at 4. Further, the clutch device 2a,
2b is connected by hydraulic pressure acting on the hydraulic chamber 5,
By draining the hydraulic pressure, the cutting state is achieved by the spring force.

6 is an independent hydraulic pump, this hydraulic pump 6
are connected via a clutch brake control valve 7 to the hydraulic chambers 3, 5 of the brake devices 1a, 1b and the clutch devices 2a, 2b, respectively. A check valve 8 is interposed between the hydraulic pump 6 and the control valve 7, and a relief circuit 9 is branched upstream from the check valve 8. And this relief circuit 9
Cooler compressor fluid pressure control circuit 10 known in
and an unload relief valve 11 that is on-loaded during winch work are connected in series.

In the cooler compressor fluid pressure control circuit 10, 12 is a sequence valve, 13 is a shuttle valve, 14 is a cooler hydraulic motor, 15 is a cooler compressor, 16 is a shuttle valve switching solenoid valve,
17 is a cooler switch.

On the other hand, 18 is a relief valve of the unload relief valve 11, 19 is an electromagnetic switching valve for switching the set pressure of this relief valve 18 to high or low, and 20 is this electromagnetic switching valve 1.
This switch 2 is a switch that turns ON and OFF 9.
0 is linked to the operating switch of the winch device.

In the above configuration, the clutch brake control valve 7
By operating the winch device, pressurized oil from the hydraulic pump 6 is supplied to the brake devices 1a, 1b and clutch devices 2a, 2b of the winch device, and both devices are operated in conjunction with each other.

At this time, the relief pressure oil in the clutch/brake control device is relieved from the relief circuit 9.

In this state, when the cooler switch 17 is turned on and the shuttle valve switching solenoid valve 16 is placed in the closed position, the shuttle valve 13 is switched to the communicating position, the cooler hydraulic motor 14 is driven, and the cooler is operated.

The present invention is as described above, and has a winch device controlled by a clutch device and a brake device which are operated by hydraulic pressure, and the clutch device and the brake device are connected to a hydraulic pump 6 via a clutch brake control valve 7. In the connected self-propelled crane, a check valve 8 is interposed between the hydraulic pump 6 of the clutch/brake device and the clutch brake control valve 7, and a relief circuit 9 is installed upstream of the check valve 8. to this relief circuit 9,
A cooler compressor fluid pressure control circuit 10 consisting of a cooler hydraulic motor 14 that drives a cooler compressor 15 and control valves such as a shuttle valve 13 that controls this cooler hydraulic motor 14, a relief valve 18, and this relief valve 18. Since the cabin cooler device of the self-propelled crane is configured by connecting in series the unload relief valve 11 consisting of the electromagnetic switching valve 19 for switching the set pressure of The boom does not affect the boom's raising/lowering and extending/contracting operations, and the cooler can be operated regardless of the boom's raising/lowering and extending/contracting operations. Further, according to the present invention, as described above, a cooler compressor fluid pressure control circuit 1 for a clutch device and a brake device for a winch device is provided.
0 and the unload relief valve 11 that controls the relief pressure are connected in series, so that the cabin cooler device is operated by the relief fluid of the clutch device and brake device of the winch device, and the hydraulic pressure of the clutch/brake device is controlled. The discharge oil pressure of the pump 6 can be used effectively.

[Brief explanation of drawings]

The drawing is a hydraulic circuit diagram showing an embodiment of the present invention. 6 is a hydraulic pump, 7 is a clutch/brake control valve, 8 is a check valve, 10 is a cooler compressor fluid pressure control circuit, and 11 is an unload relief valve.

Claims (1)

[Scope of utility model registration request] A self-propelled crane having a winch device controlled by a clutch device and a brake device that are switched and actuated by hydraulic pressure, and in which the clutch device and the brake device are connected to a hydraulic pump 6 via a clutch brake control valve 7. A check valve 8 is interposed between the hydraulic pump 6 of the clutch brake device and the clutch brake control valve 7, and a relief circuit 9 is connected to the upstream side of the check valve 8. , a cooler compressor fluid pressure control circuit 10 consisting of a cooler hydraulic motor 14 that drives a cooler compressor 15 and control valves such as a shuttle valve 13 that controls this cooler hydraulic motor 14, a relief valve 18, and this relief valve. This cabin cooler device for a self-propelled crane is characterized in that an unload relief valve 11 consisting of an electromagnetic switching valve 19 for switching a set pressure of 18 is connected in series to enable cooling regardless of whether the crane is working or traveling.