A hydraulic control system and a forklift

By introducing a second return oil passage and accumulator assembly into the forklift hydraulic control system, the problem of high-level stagnation caused by the hydraulic lock effect was solved, enabling the controllable descent of the forks and standing platform, and improving the forklift's emergency response capability and safety.

CN224453245UActive Publication Date: 2026-07-03NINGBO RUYI JOINT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NINGBO RUYI JOINT CO LTD
Filing Date
2025-07-23
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the event of a power outage or malfunction, the existing hydraulic control system of forklifts may cause the forks and standing platform to remain in a high position for an extended period due to the hydraulic locking effect, posing a safety hazard and making it difficult to achieve a reliable emergency descent.

Method used

Design a hydraulic control system comprising an oil supply assembly, a hydraulic cylinder assembly, a first solenoid valve, a manual control valve, and a second solenoid valve. The system ensures that the forks and stand-up platform can be lowered in a controlled manner during power failure through a second return oil passage, and buffers pressure fluctuations through an accumulator assembly to enhance system stability and reliability.

Benefits of technology

It effectively avoids the problem of high-level stagnation caused by the hydraulic lock effect, improves the emergency response capability and operational safety of the forklift in sudden situations, and ensures reliable control and smooth descent of the forks and standing platform.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the field of forklift technology and discloses a hydraulic control system and a forklift. The hydraulic control system includes an oil supply assembly, which includes an oil tank; a hydraulic cylinder assembly, which includes a first hydraulic cylinder and a second hydraulic cylinder. The first hydraulic cylinder is connected to the forks and drives the forks to move up and down, and the second hydraulic cylinder is connected to the standing platform and drives the standing platform to move up and down; a first solenoid valve, whose input end is connected to the oil tank and whose output end is connected to the first and second hydraulic cylinders respectively, forming an oil supply passage and a first oil return passage; and a manual control valve, whose input end is connected to the first and second hydraulic cylinders respectively, and whose output end is connected to the oil tank, forming a second oil return passage; when the first solenoid valve is de-energized, the first and second hydraulic cylinders can be connected to the oil tank through the second oil return passage. The advantages of this utility model are stable performance, safety, and high reliability.
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