Automatic leveling device and method for forward moving type forklift truck

Abstract

The invention discloses an automatic leveling device and method for a forward moving type forklift truck. The automatic leveling device comprises a transmission mechanism, an angle sensor, a sloping oil cylinder and a controller. One end of the transmission mechanism is connected with a fork frame, and the other end of the transmission mechanism is connected with the angle sensor for transmission. The angle sensor is fixed to a side moving device assembly so as to output an electric signal in proportional relation with the rotating angle of the fork frame. The sloping oil cylinder is fixed to the side moving device assembly, and the pushing end face of the sloping oil cylinder faces the fork frame. The controller is connected with the angle sensor and the sloping oil cylinder and shields other sloping orders and controls the sloping oil cylinder to act when receiving the leveling order until the upper surface of a horizontal section of a fork rotates to the horizontal position. By means of the automatic leveling device and method for the forward moving type forklift truck, the closed-loop control principle is adopted, the electric signal output by the angle sensor serves as the negative feedback, the sloping angle of the fork is judged, the action of the sloping oil cylinder is controlled, and therefore the fork can be automatically horizontal. The control manner is simple, the work efficiency is improved, and the safety risk generated when the fork frame forks goods and retreats from a tray in the non-horizontal state is lowered.

Description

technical field [0001] The invention relates to the field of forklifts, in particular to an automatic leveling device and method for a reach-type forklift. Background technique [0002] Forklifts are common equipment in the warehousing and logistics industry, and are widely used in the indoor transportation, loading and unloading of palletized goods. During the operation of the forklift, the operator will frequently adjust the inclination angle of the fork as needed, especially when the fork is about to pick up the goods or exit from under the pallet, the angle needs to be kept basically level. However, when the lifting height of the fork exceeds the height of the cab, it will become difficult to manually adjust the angle of the fork and visually check whether it is level. It may even happen that the fork starts to pick up the goods or exits from the bottom of the pallet before the fork is level, causing the fork to fall. Unsafe factors such as hitting the pallet increase t...

AI Technical Summary

Problems solved by technology

When the vehicle is going uphill or downhill at a certain angle, the reference object of the inclination angle of the fork body measured by the inclination sensor is still the horizontal plane instead of the slope surface, which will cause the fork body to be horizontal relative to the horizontal plane instead of the slope when the operator triggers the leveling. Relative to the vehicle level, this does not match the operator's judgment habits

In addition, when the sensing device is an infrared emitting and receiving device, the problem of poor adaptability of the vehicle in the uphill and downhill working environment cannot be solved.

Images