Mobile Lifting Device Hand Pump Hydraulic Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lifting devices are strenuous to operate over long distances and require fluid line connections to external pressure sources, posing obstacles and safety risks in industrial settings.
Innovation Solution
A mobile lifting device with a closed fluid circuit and a gear pump driven by a hand tool, eliminating the need for external fluid connections and featuring a flow control arrangement for efficient fluid management, allowing for quick and effortless movement of loads over long distances without electrical power or motorized components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a foot pedal is used to operate a foot pump for lifting devices, then the lifting device can be operated without external fluid connections, but the operation becomes strenuous when covering long distances
Solution Approach 1:
The lifting device is divided into two independent control systems: a foot pedal for precise control and a hand tool interface for rapid extension. This segmentation allows the operator to use the appropriate control method for different phases of lifting, resolving the contradiction between ease of operation and lifting speed.
Solution Approach 2:
A control unit acts as an intermediary between the foot pedal and the hydraulic system, enabling precise control of the piston rod extension. The control unit processes signals from the foot pedal and regulates fluid flow accordingly, improving operational ease without sacrificing lifting speed.
2Speed
If a compressed air cylinder is used with external fluid line connections, then rapid air-assisted movement is achieved, but fluid lines on the floor create obstacles and safety risks
Solution Approach 1:
The external fluid line connections are completely removed from the system. The lifting device uses a self-contained hydraulic system with a hand tool interface that eliminates the need for external compressed air lines, thereby removing the safety risks associated with fluid lines on the floor while maintaining rapid movement capability.
Solution Approach 2:
The lifting device is designed to be self-sufficient with its own hydraulic fluid system and hand tool interface. It does not require external compressed air supplies or fluid line connections, making it self-contained and safe for use in various locations without creating obstacles or safety hazards.
3Speed
If a compressed air cylinder is used for lifting, then rapid movement is achieved, but the support is minimal and requires external compressed air supply
Solution Approach 1:
The external compressed air supply and associated infrastructure are extracted from the system. The lifting device uses a self-contained hydraulic system with a hand tool interface, eliminating the need for external air lines and reducing overall device complexity while maintaining rapid movement capability.
Solution Approach 2:
The system uses hydraulic principles with a hand tool interface to generate the necessary force for rapid piston rod extension. The hydraulic fluid system provides sustained support and control, replacing the minimal support of compressed air cylinders while reducing complexity by eliminating external supply requirements.
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 effortless and safe operation over long distances with high extension speeds under load, reducing operator effort and eliminating the need for external fluid connections, while maintaining quiet operation and adhering to labor regulations.
Implementation Method 1
a main pump (45) arranged in the first fluid line (24), which, when driven, can pump fluid through the first fluid line (24), in particular from the fluid reservoir (26) via the first fluid line (24) into the lifting chamber (23), in order to extend the piston rod (32)
Implementation Method 2
a flow control arrangement (47) in the second fluid line (25). The flow control arrangement (47) can be switched between a blocked state and a released state... The flow control arrangement (47) is preferably configured to throttle the fluid flow flowing through the second fluid line (25) in the released state and/or to control or regulate it
Implementation Method 3
By changing a fluid volume in the lifting chamber (23), the piston (31) can be moved in the lifting direction in order to extend or retract the piston rod (32)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a mobile lifting device (10), which preferably has a chassis (12) with several casters (13). The lifting device (10) has a closed fluid circuit, in particular a hydraulic circuit. It has a cylinder (21) with a lifting chamber (23). The lifting chamber (23) is fluidically connected to a fluid reservoir (26) via a first fluid line (24) and a second fluid line (25). A main pump (45) is arranged in the first fluid line (24), which can be driven by means of a rotating hand tool to pump fluid from the fluid reservoir (26) into the lifting chamber (23), thereby extending a piston rod (32) of the fluid cylinder (21), for example to lift a load (20). In the second fluid line (25) a flow control arrangement (47) is arranged which can be switched between a blocking state and a release state by means of a lowering control element (48).When the piston rod (32) is extended, the flow control arrangement (47) is in the locked position. To retract the piston rod (32), it is moved into the unlocked position, allowing fluid to flow from the lifting chamber (23) through the second fluid line (25).