Safety control system for fork of forklift and method of control system

A safety control and fork technology, which is applied in the direction of lifting device, fluid pressure actuating device, servo motor assembly, etc., can solve the problem of forklift tipping, fork backward tilting speed not being controlled accordingly, easy crushing or smashing operator issues

Active Publication Date: 2019-04-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are the following problems in the use of forks that need to be improved: (1) The forks tilt forward to the limit position, and the goods fall off due to inertia, causing casualties; the forks tilt back to the limit position, and the goods move backward due to inertia , causing the cargo to squeeze or injure the operator
(2) The driver inadvertently leans forward excessively when operating the fork, which may cause the cargo to fall or the forklift to tip over
(3) The reclining speed of the fork has not been controlled accordingly, causing the cargo to be easily squeezed or injured by the operator when it exceeds the corresponding height
(4) The forklift is not equipped with an active stabilization system, and the operator must manually adjust and level the fork, which causes great inconvenience when stacking goods on the sh...

Method used

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  • Safety control system for fork of forklift and method of control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] Example 1: Cushioning control of the limit position of the fork

[0134] Fork forward tilt operation:

[0135] First, according to the forward position angle of the fork buffer control and the corresponding buffer speed determination method, it is determined that the forward position angle of the fork buffer control in this state is 4°, and the fork buffer speed is 1.5° / s;

[0136] Secondly, the rated test weight of the fork shovel is 3.5 tons, and the forward tilting work is performed at a full speed of 3° / s from the horizontal position. reduce the oil filling speed of tilt cylinder 7, so that the fork moves to the limit position of forward tilt at the corresponding buffer speed of 1.5° / s, so as to complete the buffer control of the limit position of forward tilt of the fork; during the operation of the fork, the rated The experimental weight did not move forward, and the ground pressure of the rear tire measured by the pressure sensor changed steadily.

[0137] Fork...

Embodiment 2

[0140] Example 2: Fork forward tilt angle limitation

[0141] First, according to the method of determining the installation height of the height switch, the installation height of the height switch is determined to be 1.68m;

[0142] Secondly, according to the determination method of the forward tilt limit angle of the fork, the forward tilt limit angle of the fork under the load of 3.5T is determined to be 1°;

[0143] When the rated test weight of the fork is 3.5 tons for lifting work, the lifting height of the fork is 3m, and the test weight exceeds the limit weight of the fork by 0.25 tons, when the fork is tilted forward from the horizontal position to the forward tilt angle of 1 °, the forward tilt solenoid valve 3 is closed, and the oil pump 2 stops supplying oil to the tilt cylinder 7 to complete the control of the forward tilt angle of the fork; during the operation of the fork, the rated test weight does not move forward, and the pressure sensor detects that the rea...

Embodiment 3

[0144] Example 3: Speed ​​limit control for fork backward tilt

[0145] First, the rated test weight of the pallet fork is 3.5 tons for lifting work, the lifting height of the pallet fork is 3m, and the experimental weight exceeds the limit weight of the pallet fork by 0.25 tons, and the pallet fork is tilted backward from the horizontal position;

[0146] Secondly, according to the determination method of the reclining speed of the fork, the reclining speed of the fork under the load of 3.5T is determined to be 2° / s;

[0147] When the fork is tilted backward from the horizontal position, the opening of the backward tilt solenoid valve 4 decreases, the oil supply speed of the oil pump 2 to the tilt cylinder 7 decreases, and the fork tilts backward at a corresponding backward tilt speed of 2° / s to complete the cargo. Fork rear tilt speed control; during the operation of the fork, the rated test weight does not move backward, and the ground pressure of the front tire measured by...

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PUM

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Abstract

The invention discloses a safety control system for a fork of a forklift and a method of the control system. A controller acquires a fork angle signal detected by a tilt angle sensor, a fork altitudesignal detected by an altitude switch and a fork load signal detected by a load sensor, controls the opening changes of a forward tilting solenoid valve, a backward tilting solenoid valve, a lifting solenoid valve and a falling solenoid valve, and realizes a fork extreme position buffer function, a fork forward tilting angle limiting function, a fork backward tilting speed limiting function and afork one-key leveling function. The safety control system and the method realize fork low-position buffer control, high-altitude forward tilting angle control, backward tilting speed control and one-key leveling control, so that the safety, the comfort and the convenience of drivers are improved.

Description

technical field [0001] The invention relates to the field of safety control of forklift forks, in particular to a control system and a control method for realizing the safety of forklift forks. Background technique [0002] With the rapid development of China's market economy and forklift industry, the utilization rate of forklifts in all walks of life is getting higher and higher. People's requirements for forklifts have shifted from functional requirements to high efficiency, safety, comfort, energy saving and other requirements. As the simplest and most commonly used forklift work attachment, the fork is used to carry goods of various shapes and weights. As an important component of the forklift, the corresponding working environment of the fork is becoming more and more complicated. In order to ensure the safety of the forklift Safety performance, which puts forward higher requirements for the safety control of forklifts. [0003] At present, there are the following pro...

Claims

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Application Information

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IPC IPC(8): B66F9/22B66F9/16B66F9/075F15B13/06
CPCB66F9/0755B66F9/16B66F9/22F15B13/06
Inventor 夏光许立平石鹏赵名卓张洋高军杨猛
Owner HEFEI UNIV OF TECH
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