JPH0547191Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention relates to an air conditioning system for an aerial work vehicle that supplies cold or warm air to a work platform held at the tip of a boom.

(2) Prior Art Supplying cold air or hot air to the work platform of an aerial work vehicle has been known for some time, as described in Japanese Utility Model Application Publication No. 59-64898.

(3) Problems that the invention aims to solve However, in conventional air conditioners, the air conditioner operating circuit that operates the air conditioner is connected in series or parallel to the pipe that connects the hydraulic power source and the boom operating circuit that operates the boom. Therefore, when the air conditioner and boom are operated at the same time, there is a problem in that the amount of pressurized oil discharged from the hydraulic source is insufficient, and the air conditioner and boom do not operate smoothly.

(4) Means for solving the problems In order to solve the above problems, the present invention provides an aerial work vehicle equipped with a boom operating circuit for operating the boom and an air conditioner operating circuit for operating the air conditioner. A switching valve is inserted into the pipe connecting the hydraulic power source and the boom operating circuit, and the switching valve connects the branched pipe to the air conditioner operating circuit, and detects that the operating device of the boom operating circuit has been operated. A detector is provided, and the detector and the switching valve are interlocked and connected so that the boom operating circuit is connected to the hydraulic pressure source only when the operating device for the boom operating circuit is operated.

(5) Effect With the above configuration, the hydraulic power source is normally connected to the air conditioner operating circuit via the switching valve, so the air conditioner operates, but when the operating device is operated to operate the boom, the detector is activated. It operates, switches the switching valve, connects the hydraulic power source and the boom operating circuit, and operates the boom.

(6) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the aerial work vehicle has a turntable 2 rotatably provided on a vehicle body 1, a base end of a telescoping boom 3 is pivotally supported on the turntable 2, and the telescoping boom 3 is built-in. The telescopic boom 3 is extended and contracted by a telescoping device (not shown), and is raised and lowered by a hoisting cylinder 4. A work platform 5 is held in equilibrium at the tip of the telescoping boom 3;
The operation device 6 that controls the operation of the air conditioner and the operation of the air conditioner.
An operation switch 7 for stopping is provided. An air conditioner 8 connected by hoses 11 and 12 is attached to the side surfaces of the base of the turntable 2 and the telescopic boom 3, and an air blower that expands and contracts in a telescopic manner in conjunction with the expansion and contraction of the telescopic boom 3 is attached to the side surface of the telescopic boom 3. A pipe 9 is attached, the base end of the blow pipe 9 is connected to the air conditioner 8, and the tip of the blow pipe 9 is connected by a duct 10 to a blow port 13 provided on the workbench 5.

As shown in FIG. 3, the air conditioner 8 includes a compressor 18 driven by a hydraulic motor 17, a condenser 39 equipped with a cooling fan 20 driven by an electric motor 19, and a receiver 21, which are sequentially connected by a conduit. a heater unit 15 to which a water tank 22 and a heater 23 equipped with a burner are connected by a pipe, and an evaporator 25 connected to an expansion valve 24.
, a heater core 26 provided in parallel with the evaporator 25, and a blower fan 27 driven by a hydraulic motor 28 to blow air to the evaporator 25 and the heater core 26. The 16 expansion valves 24 are connected by a hose 11a, the evaporator 25 of the blower unit 16 and the compressor 18 of the cooler unit 14 are connected by a hose 11b, and the heater 23 of the heater unit 15 and the heater core 26 of the blower unit 16 are connected by a hose 11b. connected by 12a,
The heater core 26 and the water tank 22 of the heater unit 15 are connected by a hose 12b.

FIG. 1 shows a control circuit for the air conditioner 8, in which a hydraulic pump 30 is a hydraulic power source driven by a prime mover 29 such as an engine of a working vehicle, and a telescopic boom 3 is controlled by an operating device 6 provided on a work platform 5. A conduit 32 that connects the boom operating circuit 31 that operates the
Insert the electromagnetic switching valve 33 into the
The wiring 3 connects the air conditioner operating circuit 34 that operates the air conditioner 8 to the branched pipe line, and connects the solenoid 33a of the electromagnetic switching valve 33 and the power source 35.
6, an operation switch 7 for starting and stopping the air conditioner 8, and a switch 38, which is connected to a detector 37 that detects the operation of the operation device 6 and issues a signal, and is turned off by the signal from the detector 37. inserted in series.

With the above configuration, if the air conditioner 8 is not operated, the operation switch 7 is in the off state, so the electromagnetic switching valve 33
is held at position a, the hydraulic pump 30 is connected to a boom operating circuit 31, and the telescopic boom 3 is operated by operating the operating device 6. Next, when the operating switch 7 is turned on, the solenoid 33a and the power source 35 are connected, the electromagnetic switching valve 33 is switched to the b position, and the hydraulic pump 30 is switched to the air conditioner operating circuit 34.
The air conditioner 8 is connected to the air conditioner 8 to operate the air conditioner 8 and send cold or warm air to the workbench 5. At this time, the operating device 6
When operated, the detector 37 emits a signal, turns off the switch 38, and disconnects the solenoid 33a and power supply 35.
The electromagnetic switching valve 33 is switched to position a, and the hydraulic pump 30 and boom operating circuit 31 are disconnected from each other.
are connected and the telescopic boom 3 is operated.

(7) Effects of the invention As described above, according to the invention, when the air conditioner is operating, the connection between the hydraulic power source and the air conditioner operating circuit is cut off only when the operating device is operated, and the hydraulic power source is disconnected from the air conditioner operating circuit. Since the air conditioner and the boom are connected to the boom operating circuit, the air conditioner and the boom do not operate at the same time, thereby providing an air conditioner for an aerial work vehicle in which the air conditioner and the boom operate smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a control circuit for an air conditioner, FIG. 2 is a side view of an aerial work vehicle equipped with an air conditioner, and FIG. 3 is a configuration diagram of the air conditioner. 3...Telescopic boom, 6...Operation device, 8...Air conditioner, 30...Hydraulic pump, 31...Boom operation circuit, 32...Pipe line, 33...Solenoid switching valve, 3
4... Air conditioner operating circuit, 35... Power supply, 37...
...Detector, 38...Switch.

Claims (1)

[Scope of utility model registration request] In an aerial work vehicle equipped with a boom operating circuit that operates the boom and an air conditioner operating circuit that operates the air conditioner, a switching valve is inserted into the pipe connecting the hydraulic power source and the boom operating circuit, and the switching valve allows the branching. The pipe line connected to the air conditioner operating circuit is provided with a detector that detects when the operating device of the boom operating circuit is operated, and only when the operating device of the boom operating circuit is operated, the boom operating circuit is activated. An air conditioner for an aerial work vehicle, characterized in that the detector and the switching valve are interlocked and connected to a power source.