Single-Acting Mold Clamp With Pneumatic Shaft Actuation
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Solution Overview
Problem
Existing clamping techniques in molding processes, such as rotational molding, require multiple manual actions and are limited by cycles of heating and cooling, making it difficult to efficiently compress and separate mold portions for easy part removal.
Innovation Solution
A device with a body, shaft, spring, and piston that applies a compressive force to mold portions, allowing for single-action engagement and disengagement by axial movement and rotation of the shaft, facilitated by pressurized motive fluid, enabling easy attachment and detachment of mold portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bolts are used to secure mold portions in the engaged condition, then the mold portions are held firmly in place, but multiple manual actions are required to install and remove the bolts
Solution Approach 1:
The patent replaces the manual bolt tightening system with a pneumatic or hydraulic actuation system. The actuator applies force through a shaft to the mold portion, eliminating the need for manual bolt installation and removal. This substitution of mechanical fastening with fluid-powered actuation reduces operational complexity while maintaining clamping strength.
Solution Approach 2:
The patent employs pneumatic or hydraulic actuators to generate the clamping force. Pressurized fluid is introduced into the actuator to move the shaft axially and rotate it, thereby engaging and disengaging the mold portions. This use of pneumatic/hydraulic systems enables single-action operation while providing sufficient clamping force to hold mold portions firmly.
2Reliability
If multiple manual actions are required to separate mold portions, then the clamping is secure, but the productivity is reduced due to time-consuming operations
Solution Approach 1:
The patent uses pneumatic or hydraulic actuators to perform both engagement and disengagement of mold portions through single actions. The pressurized fluid enables rapid movement of the shaft for both clamping and releasing operations, significantly reducing cycle time compared to manual bolt operations while maintaining secure clamping during the molding process.
Solution Approach 2:
The patent employs dynamic actuation where the shaft can rapidly move between engaged and disengaged positions. The actuator provides controlled motion for engagement and equally efficient motion for disengagement, enabling the mold portions to be separated quickly after curing. This dynamic capability reduces the time mold portions remain in the mold, thereby improving productivity.
3Ease of operation
If a single actuating action is used to disengage the shaft, then the operation is simplified, but the device complexity increases due to the actuator mechanism
Solution Approach 1:
The actuator serves multiple functions: it generates axial movement of the shaft for engagement/disengagement, provides rotational movement for the shaft, and controls the timing of these movements. This multi-functionality consolidates what would otherwise require separate mechanisms into a single device, reducing overall system complexity while maintaining operational simplicity.
Solution Approach 2:
The patent combines the axial movement mechanism and rotational movement mechanism into a single actuator system. The actuator integrates the force application, motion conversion, and control functions that would otherwise be separate components. This merging of functions simplifies the operator's task while the internal integration manages the mechanical complexity.
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 efficient clamping and separation of mold portions with a single actuating action, improving the ease of removing finished parts and charging molds, while maintaining compressive force during the molding process.
Implementation Method 1
The spring is disposed in the housing for applying a compressive spring force on the shaft in the first condition to engage the first and second objects in the compressive clamping relationship
Implementation Method 2
an inlet port that passes through the first end plate for introducing a pressurized motive fluid into the housing below the piston to move the piston against the spring force
Data Source
AI summary
A single-acting, full return clamp (10) holds first and second objects, such as mold portions, in a compressive clamping relationship. A body (12), for attachment to the first object, has a housing (22) with first and second end plates (16, 18). A shaft (26) moves axially in the body and rotates about an axis of the body. A shaft end (32) outside of the housing bears against the second object in a first condition and disengages from the second object in a second condition, where the shaft end is lifts away from the body, and rotates relative to the axis. A spring (40) in the housing applies compressive force on the shaft in the first condition. A piston (74), in the housing near the first end plate when the device is in the first condition, moves axially against the spring force to move the shaft while in the second condition.