Coaxial Screw Driving Machine With Radial Force Adjustment
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Solution Overview
Problem
Existing screw driving machines with air motors on the upper side of the driving cylinder increase the overall height, leading to potential issues with driving force adjustment and fastening strength due to excessive screw penetration.
Innovation Solution
A screw driving machine design with a driving piston partitioning the cylinder into two chambers, an air motor coaxially positioned with the driving cylinder, and a throttle portion on the outer periphery to adjust driving force, along with a main valve and on-off valve placement to minimize length and reduce air loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the air motor is provided on the upper side of the driving cylinder, then the screw driving machine can achieve the function of causing the driver bit to rotate, but the overall height of the machine increases
Solution Approach 1:
The air motor is merged with the driving cylinder by positioning the air motor's piston rod directly connected to the driver bit, which is also connected to the driving piston. This integration eliminates the need for separate upper mounting space, reducing overall height while maintaining the rotation function.
Solution Approach 2:
The air motor is positioned coaxially with the driving cylinder, with the air motor's piston rod passing through or alongside the driving cylinder's structural elements. This nested arrangement allows both components to occupy overlapping spatial volumes, minimizing the axial height of the assembly.
2Ease of operation
If the driving force adjustment mechanism is provided on the upper portion of the cylinder cap, then the driving force can be adjusted, but the overall height of the machine increases
Solution Approach 1:
The throttle portion is moved from the vertical dimension (upper portion of cylinder cap) to the radial dimension (outer periphery of driving cylinder). This dimensional shift allows the adjustment mechanism to be positioned horizontally rather than vertically, maintaining adjustment functionality while reducing overall height.
Solution Approach 2:
The throttle portion is made displaceable on the outer periphery of the driving cylinder, allowing it to move radially to adjust the opening area of the supply port. This dynamic positioning enables driving force adjustment without requiring additional vertical space.
3Speed
If compressed air is excessively supplied to the driving cylinder, then the driver bit can penetrate the driven member, but the screw hole becomes too deep and fastening force is weakened
Solution Approach 1:
The throttle portion provides continuous feedback control of the compressed air supply to the driving cylinder. By adjusting the opening area of the supply port, the system regulates air pressure and flow to the driving piston, preventing excessive penetration while ensuring adequate fastening force. This feedback mechanism maintains optimal driving force throughout the screw driving process.
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
Prevents increased length along the axial direction, maintains driving force adjustment, and reduces air loss, ensuring effective screw penetration and fastening without excessive hole boring.
Implementation Method 1
a driving cylinder partitioned into a first chamber and a second chamber by the driving piston, the driving cylinder being configured to cause the driver bit to move in an axial direction when compressed air is supplied to the second chamber
Implementation Method 2
an air motor configured to cause the driver bit to rotate about an axis through the driving piston when the compressed air is supplied
Implementation Method 3
a throttle portion that is disposed so as to be displaceable on an outer periphery of the driving cylinder, the throttle portion being configured to change an opening area of the supply port by being displaced
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A screw driving machine includes a driving piston to which a driver bit is attachable, a driving cylinder partitioned into a first chamber and a second chamber by the driving piston and moving the driver bit when compressed air is supplied to the second chamber, an air motor rotating the driver bit by the compressed air, an air flow path communicating the second chamber and the air motor, a main chamber storing the compressed air and communicating with the air flow path, and a main valve opening and closing communication between the air flow path and the main chamber. The driving cylinder has a supply port communicating the air flow path and the second chamber. A throttle portion is disposed to be displaceable on an outer periphery of the driving cylinder to change an opening area of the supply port.