Push-pull stacker

CN122233306APending Publication Date: 2026-06-19LINDE MATERIAL HANDLING GMBH

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: LINDE MATERIAL HANDLING GMBH
Filing Date: 2025-12-17
Publication Date: 2026-06-19

AI Technical Summary

Technical Problem

In push-pull forklifts, undesirable combinations of motion between the lifting gantry and the load receiving device can lead to dangerous operating conditions when the load receiving device is unloaded or lightly loaded, especially when the lifting of the load receiving device is activated while the push-pull carriage is retracting.

Method used

By employing electronic control devices and proportional valve technology, the proportional positions of the lifting control valve and the push-pull control valve are controlled by detecting the load pressure of the lifting cylinder and the push-pull cylinder, ensuring that the hydraulic oil flow is distributed to the push-pull cylinder and the lifting cylinder, and avoiding unwanted motion combinations, especially when the load is small or there is no load.

Benefits of technology

This technology enables the parallel operation of the push-pull carriage retraction and load receiving device lifting functions, avoiding sudden changes in movement, ensuring safety and stability, and saving energy consumption.

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Figure CN122233306A_ABST

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Abstract

This invention relates to a push-pull forklift, which includes a lifting gantry mounted on the vehicle body and movable along the longitudinal direction of the vehicle by means of a push-pull drive mechanism. The lifting gantry is equipped with a load receiving device that can be raised and lowered within the lifting gantry by means of the lifting drive mechanism. A lifting control valve with a stop position and a raised position is provided for controlling the lifting cylinder. A push-pull control valve with a retracted position and an extended position is provided for controlling the push-pull cylinder. The lifting control valve and the push-pull control valve are electrically driven by an electronic control unit connected at its input to an operating unit that controls the lifting control valve and the push-pull control valve. The lifting control valve is configured as a proportional valve with throttling in the intermediate position. The electronic control unit is configured such that, during the retraction operation of the push-pull cylinder, when the operating unit is additionally operated to control the lifting operation of the load receiving device, the lifting control valve, configured as a proportional valve, is driven toward the raised position, thereby maintaining the retraction operation of the push-pull cylinder.

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