Portable Pin Pulling Device with Electric Drive
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Solution Overview
Problem
Existing pin pulling devices for construction machinery are cumbersome, heavy, and require manual operation, posing risks to operators due to the need for direct proximity with heavy lattice pieces during assembly, and are time-consuming to handle and transport.
Innovation Solution
A compact, portable pin pulling device with an electric drive and integrated rechargeable battery, featuring a linear actuator driven by a hydraulic or pneumatic cylinder, allowing for remote control operation and safety monitoring to manage high forces, reducing operator risk and improving assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional hydraulic pin pulling devices are used, then high pinning energy is provided, but the device has large dimensions and mass making handling and transport difficult
Solution Approach 1:
The device is divided into a handle body and a separately attachable pin pulling cylinder. The handle body contains the electric drive and control electronics, while the pin pulling cylinder can be detached and carried separately to the connection point, reducing the weight that must be transported as a single unit.
Solution Approach 2:
The conventional hydraulic system with heavy pump and reservoir is replaced with an electric drive system. The electric motor drives a ball screw mechanism to generate the linear motion needed for pin insertion and extraction, eliminating the need for heavy hydraulic components while maintaining sufficient force.
2Force
If conventional pin pulling devices are used, then pin insertion force is sufficient, but handling and transport to construction site is time consuming
Solution Approach 1:
The device transitions from a static, heavy hydraulic system to a dynamic electric drive system with a brushless DC motor and ball screw. This allows for precise control of the pin insertion speed and force, enabling faster operation while maintaining sufficient force for pin insertion into the hard material.
Solution Approach 2:
The system uses variable speed control of the electric motor to optimize performance. The motor can operate at high speeds for rapid positioning and then provide high torque for the actual pin insertion, changing operational parameters to balance speed and force requirements.
3Ease of operation
If manual pin pulling operation is used, then operator can control the process, but operator must be in direct proximity with heavy lattice pieces creating safety risks
Solution Approach 1:
A wireless remote control unit serves as an intermediary between the operator and the pin pulling device. The operator can control the device from a safe distance using radio frequency communication, eliminating the need to be in direct proximity to the heavy lattice pieces and potential hazard zones.
Solution Approach 2:
The remote control unit replicates the control functions of the handheld controller, allowing the operator to issue commands from a distance. The control signals are transmitted wirelessly to operate the pin pulling device without physical presence near the work area.
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 device simplifies handling and reduces assembly time by enabling safe, remote operation of high-force pin insertion and pulling, minimizing operator risk and improving construction efficiency with a smaller, lighter design.
Implementation Method 1
an electric drive with a rechargeable battery
Implementation Method 2
a linear actuator for moving at least one pin, which is driven by means of the electric drive
Implementation Method 3
a linear actuator for moving at least one pin, which is driven by means of the electric drive; hydraulic or pneumatic cylinder
Data Source
AI summary
The invention relates to a mobile, in particular portable, pin pulling device for pulling/inserting pins for connecting components of a construction machine, in particular of a crane, wherein the pin pulling device is designed in compact construction and has at least one electric drive having a rechargeable battery and a linear actuator drivable by the drive to move at least one pin.