Fork Movement Valve Control Without Side Shift Frame Obstruction
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Solution Overview
Problem
Existing forklifts require a single shift cylinder and side shift frame to simultaneously move forks, obstructing the operator's visual field and increasing manufacturing costs.
Innovation Solution
A fork movement control device with a system of control valve units connected through flow path lines allows simultaneous fork movement using a single lever, excluding the need for a single shift cylinder and side shift frame, thereby improving visual field clarity and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single shift cylinder and side shift frame are used to simultaneously move forks, then the forks can be positioned accurately, but the operator's visual field is obstructed and manufacturing costs increase
Solution Approach 1:
The patent removes the side shift frame from the forklift structure, extracting the obstructive component while preserving the fork positioning function through an alternative control mechanism using proportional valves and hydraulic flow path lines
Solution Approach 2:
The patent replaces the mechanical side shift frame structure with a hydraulic control system using proportional valves and flow path lines, eliminating the need for physical side shift components while maintaining fork movement capability
2Manufacturing precision
If a single shift cylinder and side shift frame are used to simultaneously move forks, then the forks can be moved together, but manufacturing costs increase
Solution Approach 1:
The patent removes the expensive side shift frame and single shift cylinder assembly, extracting these costly components while replacing them with a more economical proportional valve-based hydraulic control system
Solution Approach 2:
The patent uses relatively simple proportional valves and hydraulic flow path lines instead of complex mechanical side shift frames, opting for cheaper hydraulic control components to reduce manufacturing costs
3Manufacturing precision
If a single shift cylinder and side shift frame are used, then simultaneous fork movement is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the control functions of multiple valves into a single proportional valve unit that can control both left and right fork movements, reducing the number of separate control components and simplifying the overall hydraulic system
Solution Approach 2:
The proportional valve unit performs multiple functions - controlling both left and right fork movements, enabling simultaneous operation of both forks, and providing precise positioning control, thereby reducing device complexity through multi-functionality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous fork movement without the single shift cylinder and side shift frame, enhancing operator visibility and reducing manufacturing costs by simplifying the forklift's design and hydraulic line arrangement.
Implementation Method 1
a first control valve unit 110 which is connected to a first head port 25 of a first cylinder 21 through a first flow path line L1 and connected to a first tail port 26 of the first cylinder 21 through a second flow path line L2; a second control valve unit 120 which is connected to a second head port 35 of a second cylinder 31 through a third flow path line L3 and connected to a second tail port 36 of the second cylinder 31 through a fourth flow path line L4
Implementation Method 2
a seventh flow path line L7 which connects the second flow path line L2 and the fourth flow path line L4 so that the first tail port 26 and the second tail port 36 are connected
Data Source
AI summary
The present disclosure relates to a fork movement control device. A fork movement control device according to an exemplary embodiment of the present disclosure may control and simultaneously move two forks by manipulating a single lever.