Measuring Table Lift Mechanism for Collision-Free Workpiece Placement
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Solution Overview
Problem
Existing measuring devices face challenges in accurately placing large and heavy work pieces on measuring tables without causing collisions, which can damage the device and reduce rotation accuracy due to the limitations of traditional lifting mechanisms.
Innovation Solution
A method and device that utilize a retention device to hold the work piece above the table, then lift the table to contact the work piece and transfer the load, allowing the work piece to be placed on the table while minimizing the risk of collision, using a lifting/lowering device such as a crane or anti-vibration table with gas springs and control valves to manage the movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a crane or lifter is used to suspend an extremely large work piece, then the work piece can be transported to the measuring device, but fine movement control is lost and collisions are likely to occur
Solution Approach 1:
Instead of lowering the work piece from above using a crane, the invention inverts the approach by lifting the table from below to meet the suspended work piece. This reverses the direction of movement, allowing the table to be precisely controlled while the work piece remains suspended in a stable position, thereby preventing collisions.
Solution Approach 2:
The table acts as an intermediary element between the suspended work piece and the measuring device. By lifting the table to contact the work piece, the system transfers the load from the crane to the table's support mechanism, enabling precise positioning without requiring fine movement control from the crane itself.
2Object-affected harmful factors
If the work piece is lowered slowly to prevent collision, then damage is avoided, but the operation becomes difficult and time-consuming
Solution Approach 1:
The invention eliminates the need for slow lowering by inverting the approach: the table is rapidly lifted to meet the suspended work piece. This reverses the movement dynamics, allowing fast table movement without collision risk, thereby reducing placement time while still preventing damage.
3Measurement precision
If a highly accurate guide mechanism is employed in the displacement mechanism, then measurement accuracy is ensured, but the mechanism is not resilient to collision damage
Solution Approach 1:
The invention applies preliminary anti-action by preventing collisions before they can occur. The table lifting mechanism ensures that the table contacts the work piece in a controlled manner, eliminating the need for collision-resistant design in the accurate but fragile guide mechanisms.
4Adaptability or versatility
If the work piece is suspended from a crane, then large work pieces can be handled, but the crane cannot set adequately low speed and movement may be intermittent
Solution Approach 1:
The table lifting mechanism serves as an intermediary that compensates for the crane's speed control limitations. The crane maintains coarse positioning capability for large work pieces, while the table lifting mechanism provides fine speed control during the final contact phase, combining the advantages of both approaches.
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 approach effectively prevents collisions between the work piece and the table during placement, reduces the need for skilled operation, and maintains the accuracy of the measuring device by transferring the load to the table without moving the work piece, thus avoiding damage to the device.
Implementation Method 1
a gas spring installed on the bottom surface member and supporting the top surface member
Implementation Method 2
an air layer of between several μm and tens of μm (microns) is formed in a gap between a rotor (on a rotation side) and a stator (on a fixed side), and the rotor is floating supported with respect to the stator by rigidity of the air layer
Data Source
AI summary
A method of placing a work piece on a measuring device in which a work piece is placed on a table of a measuring device is provided. The method includes: using a retainer capable of holding the work piece above the table and a lifting/lowering device lifting and lowering a top surface of the table; holding the work piece above the table with the retainer; lifting the top surface of the table with the lifting/lowering device to bring the top surface of the table into contact with a bottom surface of the work piece; and, after a load of the work piece is borne by the table, releasing the hold of the retainer on the work piece.