Cam Roller Hold-Back Device for Carriage Gap Control
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Solution Overview
Problem
Existing hold-back systems for vehicle production lines face issues with equipment failure due to high load on electric torque motors, leading to accidents and non-operation, as they generate excessive heat and experience frequent failures.
Innovation Solution
A hold-back device utilizing a cam roller operated by a cylinder, which applies back pressure or discharged air to prevent the gap between carriages, rotating in the same direction as the carriage movement, and includes a spring and spring bar for elastic support, along with a brake device to stop the system when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electric torque motor is used to rotate the driving roller in reverse direction to push carriages, then the gap between carriages can be prevented from increasing, but a large amount of load is applied to the motor causing high-temperature heat generation and frequent failures
Solution Approach 1:
Instead of rotating the roller in reverse direction against carriage movement, the invention rotates the roller in the same direction as carriage movement. The roller surface moves faster than the carriage, creating forward friction that pushes the carriage forward, thereby preventing gap increase without applying reverse load to the motor
2Object-affected harmful factors
If rollers are attached to electric motor to rotate reversely and push carriages, then accidents caused by large gaps can be prevented, but the motor generates excessive heat leading to frequent failures
Solution Approach 1:
The invention inverts the rotation direction principle: the roller rotates in the same direction as carriage movement rather than reverse. The speed difference between roller surface and carriage creates forward friction force, eliminating the need for reverse rotation and the associated high-temperature heat generation
Solution Approach 2:
The invention replaces the electric motor-driven system with a pneumatic cylinder that directly pushes the roller. The cylinder rod connects to the roller center, and pneumatic pressure provides the driving force, eliminating the electric motor and its heat generation issues
3Ease of operation
If the driving roller rotates in reverse direction to provide friction interference, then carriages can be pushed in reverse direction, but the structure becomes complex and maintenance difficult
Solution Approach 1:
The invention replaces the complex electric motor-speed reducer-roller drive system with a simpler pneumatic cylinder-roller system. The cylinder directly pushes the roller, eliminating the need for motor rotation control and speed reduction mechanisms
Solution Approach 2:
Instead of using reverse rotation to push carriages, the system uses forward rotation with speed difference. The roller rotates in the same direction as carriage movement but at higher speed, creating forward friction that simplifies the control mechanism
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
This solution reduces the risk of accidents, improves operational rates, simplifies the structure for easier maintenance, and lowers costs by using standard mechanical parts, thereby enhancing the reliability and efficiency of the hold-back system.
Implementation Method 1
provides back pressure when a cam roller is rotated
Implementation Method 2
rotated while coming into contact with the carriage, and a spring and a spring bar which elastically support the entirety of the cylinder frame including the cam roller and the cylinder to the carriage
Implementation Method 3
a spring and a spring bar which elastically support the entirety of the cylinder frame including the cam roller and the cylinder to the carriage
Implementation Method 4
rotated while coming into contact with the carriage
Data Source
AI summary
A device for restricting movement of a carriage that is used to convey vehicles and workers in an assembly line in a factory for assembling complete vehicles includes a hold-back device for the carriage which can prevent an accident caused by equipment failure and improves an operating rate by implementing a new conceptual hold-back system which allows a cam roller operated by a cylinder to come into close contact with a side surface of the carriage to rotate in a direction identical to a carriage movement direction, and provides a load to the carriage by using back pressure/discharged air from the cylinder so as to prevent an increase in gap between carriages.