Pneumatic Impact Wrench Pilot-Operated Valve Control
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Solution Overview
Problem
Conventional impact wrenches with manually operated switches and valves suffer from power density reduction and increased supply air pressure requirements, leading to inefficient handling and reduced working speed.
Innovation Solution
A hand tool with a rotating tool shaft and an impact mechanism, utilizing a pilot-operated 5/3-way valve controlled by an electrical switch or microprocessor for precise torque and rotation control, eliminating the need for throttling components and optimizing air routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manually operated switches and valves are used in impact wrenches, then the device structure is simple, but power density is reduced and supply air pressure requirements increase
Solution Approach 1:
The patent replaces manual mechanical switches and valves with an electrical control system. A trigger switch activates an electromagnetic valve that controls compressed air flow to the turbine, substituting manual mechanical operations with automated electro-pneumatic control. This eliminates the need for multiple manual throttling components while maintaining simple overall device structure.
Solution Approach 2:
The patent introduces an electromagnetic valve as an intermediary component between the electrical trigger switch and the compressed air turbine. This intermediary automatically controls air flow based on electrical signals, eliminating the need for direct manual operation of multiple valves and switches, thereby reducing resistance losses and improving power density.
2Device complexity
If manually operated switches and valves are used in impact wrenches, then the device structure is simple, but supply air pressure requirements increase
Solution Approach 1:
The electrical control system with electromagnetic valve replaces manual mechanical valve operation, eliminating the need for high supply air pressure that would be required to actuate multiple manual valves. The electromagnetic valve uses electrical energy rather than pneumatic pressure for actuation, reducing the required supply air pressure while keeping the device structure simple.
3Speed
If throttling components are used in impact wrenches, then speed control is possible, but resistance losses increase and working speed decreases
Solution Approach 1:
The patent extracts and eliminates throttling components from the air flow path. Instead of using throttling valves to control turbine speed, the system uses an electromagnetic valve that controls the presence or absence of compressed air flow. This removes the source of resistance losses while maintaining the ability to control rotational speed through electrical signaling.
Solution Approach 2:
Manual throttling control is replaced with electrical control of an electromagnetic valve. The electromagnetic valve responds to electrical signals from the trigger switch, eliminating mechanical throttling components that cause resistance losses. This substitution maintains speed control capability while reducing energy losses.
4Adaptability or versatility
If multiple manual switches and valves are used, then control functions are comprehensive, but handling efficiency is reduced and user effort increases
Solution Approach 1:
The patent merges multiple manual control functions into a single integrated electrical control system. The trigger switch and directional control are combined into one hand-operated mechanism that actuates the electromagnetic valve, which in turn controls both turbine rotation and impact mechanism activation. This consolidation maintains comprehensive control functions while dramatically improving handling efficiency by requiring minimal user effort.
Solution Approach 2:
The electromagnetic valve serves as an intermediary that translates simple electrical signals from the trigger switch into complex pneumatic control actions. This intermediary handles the coordination of multiple control functions automatically, eliminating the need for the user to manually operate multiple switches and valves, thereby improving ease of operation while maintaining versatile control capabilities.
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
The solution enhances power density, simplifies construction, and improves handling efficiency by reducing resistance losses and enabling remote control, resulting in faster operation and reduced user effort.
Implementation Method 1
pilot-operated 5/3-way valve (electromagnetic, piezoelectric or similar pilot-controlled)
Implementation Method 2
The compressed air normally acts on a turbine, which converts the pneumatic pressure and the pneumatic volume flow into a rapid rotation of the tool shaft.
Implementation Method 3
an impact mechanism for exercising and/or generating a periodic impact function acting in the radial direction on the tool shaft
Data Source
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AI summary
A pneumatically operated hand tool (10) with a rotating tool shaft (14) is disclosed. The tool shaft (14) is coupled to an impact mechanism for generating or applying a periodic impact function acting radially on the tool shaft (14). The hand tool (10) comprises at least one actuating element (20) for activating the pneumatic drive for the tool shaft (14). At least one pilot-operated 5/3-way valve (26) for activating and controlling the functions of the hand tool (10) is arranged between a pneumatic connection (22) of the hand tool (10) and the pneumatic drive of the tool shaft (14). This valve is operatively connected to the at least one actuating element (20) and can be controlled by or via the actuating element (20).