JP2002029690A - Heating device for battery type forklift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce battery wastage, by not making a battery serve as a power source but making a temperature rise of hydraulic oil in a hydraulic device serve as a heat source, in a heating device for a battery type forklift truck. SOLUTION: Hydraulic oil generating a rise of temperature in operation of a cargo handling device in the battery type forklift truck is allowed to flow into an oil cooler 8 connected to be inserted between a control valve 7 and an oil tank 9, to be fed to a driver side by driving a blower 11. In this way, heating can be operated with no consumption of power of a battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for a battery-powered forklift, and more particularly to a technology of a heating device utilizing a rise in the temperature of hydraulic oil in a cargo handling device.

[0002]

2. Description of the Related Art Heretofore, in a battery-powered forklift heating system, a battery mounted on a battery-powered forklift is used to heat an electric heater to use the heat generated for heating.

[0003]

However, in a battery-type forklift using a battery as a driving energy source, the electric heater consumes a large amount of electric power, which causes a reduction in the operating time of the battery-type forklift.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has been made to reduce battery consumption by using hydraulic oil, which rises in temperature when a hydraulic device is operated, as a heat source for heating. An object of the present invention is to provide a heating device for a battery-powered forklift.

[0005]

According to one aspect of the present invention, there is provided a battery provided with a cargo handling device driven by supply of pressurized oil from a hydraulic device to carry out and carry in a load. A forklift equipped with an oil cooler inserted in the middle of an oil pipeline in which hydraulic oil supplied to a cargo handling device returns to an oil tank, and a fan for exchanging heat with air in the oil cooler and discharging warm air It is a thing.

[0006] In the above configuration, hot oil from the cargo handling device flows into the oil cooler, and heat is exchanged with air in the oil cooler portion by driving a fan to obtain hot air. For this reason, compared with the electric heater using the electric energy of the battery, the amount of power consumption of the battery can be reduced, and the operating time of the battery-type forklift can be maintained longer.

According to a second aspect of the present invention, in the heating device for a battery type forklift according to the first aspect, the oil cooler is provided between the control valve for controlling the supply of hydraulic oil to the cargo handling device and the oil tank. Is inserted in the middle of the oil pipeline. In this configuration,
The temperature rise of the hydraulic oil discharged from the cargo handling equipment is high,
By opening and closing the control valve, high-temperature operating oil is appropriately supplied to the oil cooler, so that the driver can be supplied with warm air having a temperature suitable for heating.

According to a third aspect of the present invention, there is provided a battery type forklift according to the first or second aspect,
The oil cooler is disposed near a driver's seat so as to discharge hot air toward the driver's feet. In this configuration, warm air can be sent to the feet of the driver during driving, and the driver can work comfortably even in a severely cold season.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery-powered forklift heating apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an external configuration of a battery-powered forklift according to an embodiment. The battery-powered forklift 1 is a so-called counter type, and includes a frame 2, a loading / unloading device 3 mounted to be tiltable in front of the frame 2, and a traveling drive device ( (Not shown) and a rear wheel 5 disposed below and behind the frame 2.

A dashboard 2a is fixed to the upper front of the frame 2, and a space is formed above the rear of the frame 2 at a predetermined distance from the dashboard 2a so that the driver can get on and off freely. An oil tank 9 is housed in the frame 2 below the space formed between the dashboard 2a and the battery B in which the battery B is arranged.

On the dashboard 2a, a steering handle 10 capable of changing the direction of travel of the rear wheel 5 is provided.
And a loading / unloading operation lever 6 for tilting the loading / unloading device 3 in the front-rear direction to drive the loading / unloading device 3, and a control valve 7 for opening / closing the pipeline by tilting the loading / unloading operation lever 6 in the forward / backward direction.

The cargo handling device 3 includes a mast 30 which is mounted to be tiltable in front of the frame 2, a fork 31 which moves vertically along the mast 30, and a rear portion of the mast 30. And a tilt cylinder 33 having one end fixed to the frame 2 and tilting the mast 30 in the front-rear direction in accordance with the expansion and contraction of the rod. The lift cylinder 32 and the tilt cylinder 33 are connected to the loading operation lever 6.
And a control valve 7 respectively.

Lift cylinder 32 and tilt cylinder 3
3 are separately connected to a control valve 7 and an oil pipe (not shown).
Are inserted and connected between the control valve 7 and the oil tank 9 and are disposed in a U-shaped space formed between the dashboard 2a, the frame 2 and the battery B in a side view.

FIG. 2 shows a configuration of a heating device in the battery-powered forklift, and FIG. 3 shows a plan configuration of the battery-powered forklift. The oil cooler 8 is inserted between an oil line 7 a connected to the control valve 7 and an oil line 9 a connected to the oil tank 9.
The oil cooler 8 is fixed to the frame 2 near the driver's feet near an oil tank 9 provided below the frame 2. Blower 11 facing oil cooler 8
A (fan) is disposed, and the air discharged by the blower 11 exchanges heat with the high-temperature hydraulic oil in the oil cooler 8 to be turned into warm air and sent toward the driver's feet. By the way,
When the temperature of the hydraulic oil reaches about 100 ° C., hot air of about 40 ° C. can be obtained even in a freezing warehouse (for example, about −20 ° C.).

A loading operation lever 6 for tilting forward and backward is disposed above and in front of the frame 2, and a control valve for opening and closing a pipeline by operating the loading operation lever 6 is provided near the loading operation lever 6 of the frame 2. The control valve 7 is fixed, and the control valve 7 is connected to the lift cylinder 32 and the tilt cylinder 33 via an oil pipe (not shown).

The operation of the above-described circuit configuration will be described. When the cargo handling operation lever 6 is manually tilted forward, the control valve 7 is opened and the lift cylinder 3 is opened.
Hydraulic oil is supplied to the lift cylinder 32 or the tilt cylinder 33 from one port of the lift cylinder 32 or the tilt cylinder 33, the rod of the lift cylinder 32 or the tilt cylinder 33 is extended, and the inside of the lift cylinder 32 or the tilt cylinder 33 is extended from another port. Hydraulic fluid is discharged.
The internal hydraulic oil discharged at this time is compressed and discharged by the extension of the rod, so that the temperature of the hydraulic oil rises.
The raised operating oil flows into the oil cooler 8 and exchanges heat with the air sent by the blower 11 to obtain hot air, which is used for heating.

According to the present embodiment, the lift cylinder 32
The hydraulic oil whose temperature has risen due to the operation of the tilt cylinder 33 flows into the oil cooler 8 and exchanges heat with the hydraulic oil in the oil cooler 8 and the wind sent by the blower 11 to use the warm warm air for heating. Therefore, the power of the battery B is not consumed. Further, since the blower 11 can send warm air to the driver's feet, the driver can work comfortably even in a severe cold season, and can comfortably work in a low-temperature work environment such as a freezing warehouse. It is possible to proceed with the work.

Further, since the oil cooler 8 can be arranged in the vicinity of the control valve 7 and the oil tank 8, it is possible to shorten the oil pipeline and simplify the piping.

The present invention can be variously modified without being limited to the configuration of the above embodiment. For example, the oil cooler 8 can be inserted and connected in the middle of the oil line between the control valve 7 and the cargo handling device 3.

The control valve 7 may be of an electric type instead of a manual type in which the pipeline is directly opened and closed by the forward and backward tilting operations of the cargo handling operation lever 6. In this case, an electromagnetic coil (not shown) of the control valve 7 may be excited by a limit switch (not shown) operated by the cargo handling operation lever 6 to open and close the pipeline.

[0021]

As described above, according to the battery-powered forklift heating system of the present invention, the oil cooler is inserted and connected in the middle of the oil pipeline in which the hydraulic oil supplied to the cargo handling device returns to the oil tank. The discharged air is heat-exchanged with the operating oil whose temperature has been increased by the oil cooler, and the warm air warmed by this heat exchange is sent to the driver, so that heating is performed without consuming battery power. Becomes possible.

Also, by blowing warm air to the feet of the driver during driving, if sufficient measures to prevent cold can not be taken at the feet during a severe cold season, warm air is sent to the feet of the driver. It is possible to work comfortably.

[Brief description of the drawings]

FIG. 1 is a side view of a battery-powered forklift according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the heating device.

FIG. 3 is a plan view of the same heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery-powered forklift 3 Cargo handling device 7 Control valve 8 Oil cooler 9 Oil tank

Claims (3)

[Claims] 1. A battery type forklift equipped with a cargo handling device driven by supply of pressure oil from a hydraulic device to carry out and carry in a load, wherein an oil pipeline in which hydraulic oil supplied to the cargo handling device returns to an oil tank. A heating device for a battery-type forklift, comprising: an oil cooler inserted in the middle; and a fan for exchanging heat with air in the oil cooler portion and discharging hot air. 2. The oil cooler according to claim 1, wherein the oil cooler is inserted in the middle of an oil pipe between the control valve for controlling supply of hydraulic oil to the cargo handling device and the oil tank. A heating device for a battery-powered forklift according to claim 1. 3. The battery according to claim 1, wherein the oil cooler is disposed near a driver's seat so as to discharge hot air toward a driver's feet. Type forklift heating system.