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US-12623894-B2 - Load fall preventing system for forklift

US12623894B2US 12623894 B2US12623894 B2US 12623894B2US-12623894-B2

Abstract

Provided is a load fall preventing system for a forklift according to an exemplary embodiment of the present disclosure includes a load weight measuring unit 1 including a plurality of pressure sensors for measuring weight of a load loaded on a fork of a forklift, a risk determination unit 2 for determining a degree of risk of a loading situation of the load based on pressure information measured by the plurality of pressure sensors; and an operation unit 3 that performs an operation to prevent a fall of the load in accordance with the degree of risk of the loading situation determined by the risk determination unit.

Inventors

  • Gwangwoo KIM

Assignees

  • DOOSAN INDUSTRIAL VEHICLE CO., LTD.

Dates

Publication Date
20260512
Application Date
20231207
Priority Date
20230308

Claims (10)

  1. 1 . A system for preventing a load from falling for a forklift, the system comprising: a load weight measuring unit including a plurality of pressure sensors for measuring weight of a load loaded on a fork of a forklift; a risk determination unit for determining a degree of risk of a loading situation of the load based on pressure information measured by the plurality of pressure sensors and an assigned weight based on a load location; and an operation unit for performing an operation to prevent a fall of the load according to the degree of risk of the loading situation determined by the risk determination unit, wherein the degree of risk of the loading situation is determined by assigning weight proportional to the closeness of the loading position of the load toward the end of the fork to the loaded load, or by assigning weight when the load is loaded while hanging from one fork.
  2. 2 . The system of claim 1 , wherein the forklift forks are formed as a left and right pair, and the plurality of pressure sensors of the load weight measuring unit is mounted in a plurality of compartmentalized regions compartmentalized in a longitudinal direction of each of the left and right pair of forks, respectively.
  3. 3 . The system of claim 2 , wherein the risk determination unit determines a loading position of the load based on the pressure information measured in real time from the plurality of pressure sensors, respectively.
  4. 4 . The system of claim 3 , wherein the risk determination unit determines a left-right balance state of the loaded load from the pressure information measured by the plurality of pressure sensors, respectively.
  5. 5 . The system of claim 4 , wherein the risk determination unit determines the degree of risk of the loading situation of the load based on the loading position of the load, the left-right balance state of the load, and the weight of the load measured by the load weight measuring unit.
  6. 6 . The system of claim 5 , wherein the degree of risk of the loading situation is categorized into a safe state, a cautionary state, and a warning state.
  7. 7 . The system of claim 6 , wherein the safe state corresponds to the case where the load is unloaded because the load is weightless, or when the load is balanced left and right.
  8. 8 . The system of claim 7 , wherein the cautionary state corresponds to the case where the load is not left and right balanced and is loaded with a bias toward one fork, but the load applied to the one fork is equal to or less than the maximum loaded load of the one fork, or when the load is left and right balanced, but the load equal to or greater than the maximum loaded load of all two forks is applied.
  9. 9 . The system of claim 8 , wherein he warning state corresponds to the case where the load is not left and right balanced and is loaded with a bias toward one fork, but the load applied to the one fork is equal to or greater than the maximum loaded load of the one fork, where the left and right balanced state of the loaded load is in the cautionary state and the load equal to or greater than the maximum loaded load of all two forks is applied, or where a movement of the load in one direction by a certain threshold or more is detected during driving.
  10. 10 . The system of claim 9 , wherein the operation unit, in real time during the loading of the load and during an operation of a vehicle, informs a forklift operator of the degree of risk of the loading situation, or slows down and stops the forklift, or restricts an operation of a forklift operating device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims benefit and priority to Korean Patent Application No. 10-2023-0030419, filed on Mar. 8, 2023, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. TECHNICAL FIELD The present disclosure relates to a system for preventing a load fall of a forklift, and more particularly, to a system for preventing a load fall accident that may occur when a load of a forklift is tilted to one side or swayed when the forklift operates. BACKGROUND Forklifts are required to carry a wide variety of loads, and forklifts do not operate with only flat-shaped loads. Accordingly, it is common for a driver to drive a forklift with a load based on the driver's experience or visual perception when loading the load, and in this case, there is a high probability that the load will fall because the load is tilted to one side or swayed when the forklift operates. To prevent such a fall of a load, Korean Patent Application Laid-Open No. 10-2022-0022554 (published on Feb. 28, 2022) discloses installation of a structure that prevents a load from falling as a prior art. Referring to FIG. 1, a forklift load fall preventing device according to the prior art includes a main body; an elevating part having a fixed frame part fixed to the main body, an elevating frame part installed to the fixed frame part to be elevatable; a towing part mounted to the elevating frame part, elevated upon elevation of the elevating frame part, and securing a load; and a fall preventing part mounted to the fixed frame part and preventing the load secured to the towing part from falling. However, this prior art has a problem in that it is impossible to predict in advance the possibility of a load falling. Accordingly, there is a need to develop a system for detecting a load condition in advance when a forklift loads or transports a load, and taking measures to prevent a fall of the load. PRIOR ART LITERATURE Patent Document Korean Patent Application Laid-Open No. 10-2022-0022554 (published on Feb. 28, 2022) SUMMARY The present disclosure has been made in an effort to provide a system for preventing a load fall accident by detecting a loading situation in real time when a forklift loads or transports the load and notifying a driver of the loading situation or decreasing a forklift speed or stopping the forklift. An exemplary embodiment of the present disclosure provides a system for preventing a load from falling for a forklift, the system including: a load weight measuring unit including a plurality of pressure sensors for measuring weight of a load loaded on a fork of a forklift; a risk determination unit for determining a degree of risk of a loading situation of the load based on pressure information measured by the plurality of pressure sensors; and an operation unit for performing an operation to prevent a fall of the load according to the degree of risk of the loading situation determined by the risk determination unit. The forklift forks may be formed as a left and right pair, and the plurality of pressure sensors of the load weight measuring unit may be mounted in a plurality of compartmentalized regions compartmentalized in a longitudinal direction of each of the left and right pair of forks, respectively. The risk determination unit may determine a loading position of the load based on the pressure information measured in real time from the plurality of pressure sensors, respectively. The risk determination unit may determine a left-right balance state of the loaded load from the pressure information measured by the plurality of pressure sensors, respectively. The risk determination unit may determine the degree of risk of the loading situation of the load based on the loading position of the load, the left-right balance state of the load, and the weight of the load measured by the load weight measuring unit. The degree of risk of the loading situation may be categorized into a safe state, a cautionary state, and a warning state. The safe state may correspond to the case where the load is unloaded because the load is weightless, or when the load is balanced on the left and right. The cautionary state may correspond to the case where the load is not left and right balanced and is loaded with a bias toward one fork, but the load applied to the one fork is equal to or less than the maximum loaded load of the one fork, or when the load is left and right balanced, but the load equal to or greater than the maximum loaded load of all two forks is applied. The warning state may correspond to the case where the load is not left and right balanced and is loaded with a bias toward one fork, but the load applied to the one fork is equal to or greater than the maximum loaded load of the one fork, where the left and right balanced state of the loaded load is in the cautionary state and the load equal to or greater than the maximum loaded load o