Magnetic Force Measuring Device Using Screw Rod Mechanism

The patent introduces an intermediate mechanical transmission system consisting of a screw rod, nut, and jacking block that acts as a mediator between the operator and the test workpiece. This intermediary mechanism converts rotational motion into linear motion with controlled, uniform speed, eliminating the direct human-hand-spring scale connection that causes measurement variations. The screw rod mechanism ensures consistent lifting speed regardless of operator differences, thereby resolving the contradiction between operational simplicity and measurement precision.

The patent replaces the direct mechanical pulling method with a screw rod-nut-jacking block mechanical transmission system. This substitution transforms the uncontrolled linear motion of direct pulling into controlled, uniform linear motion through the mechanical advantage and self-locking properties of the screw mechanism. The replacement maintains mechanical operation simplicity while achieving precise, repeatable measurement results.

The jacking block serves as a critical intermediary component that concentrates and transmits the pulling force uniformly to the test workpiece. By introducing this intermediary, the system ensures that the full maximum force is reliably applied and measured, eliminating the force distribution inconsistencies that occur with direct spring scale pulling. The jacking block's rigid structure and controlled motion ensure reliable force transmission.

The patent transforms the static spring scale measurement into a dynamic controlled lifting process using the screw rod mechanism. The dynamic rotation-to-linear-motion conversion allows the system to progressively apply and maintain the maximum required force, ensuring reliable capture of the peak magnetic force value. The mechanical dynamics of the screw system provide controlled force application that enhances measurement reliability.

The screw rod-nut-jacking block mechanism is designed to be self-regulating, where the mechanical properties of the screw threads automatically control the lifting speed and force application. Once the operator initiates the measurement by rotating the screw rod, the system self-regulates the motion speed and force distribution without requiring operator skill or attention to maintain consistency. This self-service characteristic eliminates operator-induced variations while maintaining ease of operation.

The patent replaces the human operator's direct manual pulling action with a mechanical screw rod-nut-jacking block system. This substitution removes the human element of variable lifting speed from the measurement process. The mechanical system's inherent properties (thread pitch, friction, mechanical advantage) ensure that all operators, regardless of individual differences, achieve identical measurement conditions, thereby resolving the contradiction between operational accessibility and result consistency.