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Loading and unloading vehicles

A technology for loading and unloading vehicles and loading and unloading devices, which is applied to lifting devices, fluid pressure actuating devices, servo motors, etc., and can solve problems such as stopping of loading and unloading actions

Active Publication Date: 2019-11-05
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in loading and unloading vehicles such as the above-mentioned prior art, when the hydraulic load between the loading and unloading pump and the loading and unloading hydraulic working device increases, the loading and unloading operation may temporarily stop.

Method used

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  • Loading and unloading vehicles
  • Loading and unloading vehicles
  • Loading and unloading vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0020] figure 1 It is a figure which shows the schematic structure of the engine type forklift which is one embodiment of the handling vehicle concerning this invention. exist figure 1 Among them, a forklift 1 as a loading and unloading device according to this embodiment includes a loading and unloading device 2 . The loading and unloading device 2 includes a mast 3, a fork 5 that is attached to the mast 3 via a lifting bracket 4 to load cargo, a lift cylinder 6 that lifts the fork 5, and a swing cylinder 7 that tilts the mast 3 forward or backward. .

[0021] In addition, the forklift 1 is provided with an engine 8 used as a drive source for travel and loading and unloading operations, a hydraulic pump 9 driven by the engine 8 to discharge hydraulic oil, an oil tank 10 for storing hydraulic oil, and a hydraulic pump 9 disposed between the hydraulic pump 9...

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PUM

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Abstract

A cargo vehicle includes a hydraulic pump (9) driven by an engine (8), a cargo handling apparatus (2) operated by hydraulic oil from the hydraulic pump, a cargo operating unit (12, 13) for performing an instruction operation to operate the cargo handling apparatus, an electromagnetic proportional control valve (14, 15) disposed between the hydraulic pump and the cargo handling apparatus, a valve controller (22) that controls the electromagnetic proportional control valve depending on an operation state of the cargo operating unit, and a revolution detector (20) that detects a revolution of the engine, wherein the valve controller controls the electromagnetic proportional control valve such that an opening degree of the electromagnetic proportional control valve is limited for a certain time when the revolution of the engine detected by the revolution detector is lower than a predetermined value.

Description

technical field [0001] The present invention relates to loading and unloading vehicles. Background technique [0002] As a loading and unloading vehicle, for example, a forklift as described in JP 2012-62137 A is known. The loading and unloading vehicle recorded in Japanese Patent Laid-Open No. 2012-62137 has: a hydraulic working device for loading and unloading; a pump for loading and unloading driven by an engine; A hydraulic pipeline is used to branch and connect with the fuel tank; a switch valve is set in the discharge pipeline; a control device is used to control the switch valve so that the discharge pipeline is closed when the engine speed is greater than the default value, and the discharge pipeline is closed when the engine speed is below the default value case, the discharge pipe is opened; and the sub-relief valve is provided on the downstream side of the switching valve of the discharge pipe. When the pressure of the working oil flowing in the discharge pipeli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66F9/22
CPCB66F9/22E02F9/2203E02F9/2246F15B11/08F15B13/044F15B19/00F15B2211/20523F15B2211/633F15B2211/7051
Inventor 加藤纪彦小出幸和
Owner TOYOTA IND CORP