Container transportation is pivotal in global trade due to its efficiency,safety,and cost-effectiveness.However,structural defects—particularly in grapple slots—can result in cargo damage,financial loss,and elevated...Container transportation is pivotal in global trade due to its efficiency,safety,and cost-effectiveness.However,structural defects—particularly in grapple slots—can result in cargo damage,financial loss,and elevated safety risks,including container drops during lifting operations.Timely and accurate inspection before and after transit is therefore essential.Traditional inspection methods rely heavily on manual observation of internal and external surfaces,which are time-consuming,resource-intensive,and prone to subjective errors.Container roofs pose additional challenges due to limited visibility,while grapple slots are especially vulnerable to wear from frequent use.This study proposes a two-stage automated detection framework targeting defects in container roof grapple slots.In the first stage,YOLOv7 is employed to localize grapple slot regions with high precision.In the second stage,ResNet50 classifies the extracted slots as either intact or defective.The results from both stages are integrated into a human-machine interface for real-time visualization and user verification.Experimental evaluations demonstrate that YOLOv7 achieves a 99%detection rate at 100 frames per second(FPS),while ResNet50 attains 87%classification accuracy at 34 FPS.Compared to some state of the arts,the proposed system offers significant speed,reliability,and usability improvements,enabling efficient defect identification and visual reconfirmation via the interface.展开更多
This article introduces the history and development of log grapple in China.Ac-cording to the special conditions of Chinese forest areas,we have selected log grapple driven byelectric drum,and have analyzed and calcul...This article introduces the history and development of log grapple in China.Ac-cording to the special conditions of Chinese forest areas,we have selected log grapple driven byelectric drum,and have analyzed and calculated its parameters theoretically.This is the first loggrapple driven by an electric drum made successfully in China.The Model DZ1 log grapple has alarge closing force,works safely and is suitable for the special forest working conditions inChina.展开更多
This paper study on grabbing moving resistance and performance of double-power screw driving grapple with vibration in the grabbing logs. Applying the vibration mechanism can reduce the grabbing moving resistance when...This paper study on grabbing moving resistance and performance of double-power screw driving grapple with vibration in the grabbing logs. Applying the vibration mechanism can reduce the grabbing moving resistance when the grapple grabs logs. According to this principle, we have developed the contruction of this double-power screw driving grapple with vibration. It has great significance for increasing efficiency and decreasing dead-weight of grapple(grab bucket).展开更多
It's reported that the British House of Commons passed a bill February 14 to ban smoking in every pub, club and indoor public space in England. The legislation is now submitted to the upper House of Lords. If pass...It's reported that the British House of Commons passed a bill February 14 to ban smoking in every pub, club and indoor public space in England. The legislation is now submitted to the upper House of Lords. If passed, it will become law by mid-2007. With the ban, Britain joins Ireland, Finland, Italy, New Zealand, Norway, South Africa, Spain, Sweden and several U.S. states and cities, all of which have restricted smoking in public places in recent years.展开更多
文摘Container transportation is pivotal in global trade due to its efficiency,safety,and cost-effectiveness.However,structural defects—particularly in grapple slots—can result in cargo damage,financial loss,and elevated safety risks,including container drops during lifting operations.Timely and accurate inspection before and after transit is therefore essential.Traditional inspection methods rely heavily on manual observation of internal and external surfaces,which are time-consuming,resource-intensive,and prone to subjective errors.Container roofs pose additional challenges due to limited visibility,while grapple slots are especially vulnerable to wear from frequent use.This study proposes a two-stage automated detection framework targeting defects in container roof grapple slots.In the first stage,YOLOv7 is employed to localize grapple slot regions with high precision.In the second stage,ResNet50 classifies the extracted slots as either intact or defective.The results from both stages are integrated into a human-machine interface for real-time visualization and user verification.Experimental evaluations demonstrate that YOLOv7 achieves a 99%detection rate at 100 frames per second(FPS),while ResNet50 attains 87%classification accuracy at 34 FPS.Compared to some state of the arts,the proposed system offers significant speed,reliability,and usability improvements,enabling efficient defect identification and visual reconfirmation via the interface.
文摘This article introduces the history and development of log grapple in China.Ac-cording to the special conditions of Chinese forest areas,we have selected log grapple driven byelectric drum,and have analyzed and calculated its parameters theoretically.This is the first loggrapple driven by an electric drum made successfully in China.The Model DZ1 log grapple has alarge closing force,works safely and is suitable for the special forest working conditions inChina.
文摘This paper study on grabbing moving resistance and performance of double-power screw driving grapple with vibration in the grabbing logs. Applying the vibration mechanism can reduce the grabbing moving resistance when the grapple grabs logs. According to this principle, we have developed the contruction of this double-power screw driving grapple with vibration. It has great significance for increasing efficiency and decreasing dead-weight of grapple(grab bucket).
文摘It's reported that the British House of Commons passed a bill February 14 to ban smoking in every pub, club and indoor public space in England. The legislation is now submitted to the upper House of Lords. If passed, it will become law by mid-2007. With the ban, Britain joins Ireland, Finland, Italy, New Zealand, Norway, South Africa, Spain, Sweden and several U.S. states and cities, all of which have restricted smoking in public places in recent years.
