Split-Claw Puller Structure for Interference-Fit Valve Seat Removal
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Solution Overview
Problem
The existing puller tools for valve seats in hydraulic plunger pumps face difficulties in disassembly and replacement due to interference fits, leading to increased pressure and impact loads, which damages the tools and reduces operation efficiency.
Innovation Solution
A puller design featuring two split-type claws with specific notch and thread configurations allows for easier assembly and disassembly without a clamp, preventing thread damage and enabling thicker, more robust pulling parts to withstand higher loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a valve seat is tightly pressed in the valve box through interference fit, then the connection strength is improved, but the ease of disassembly and replacement deteriorates
Solution Approach 1:
The puller is divided into two separate claws (first claw and second claw) that can be independently inserted into the valve seat. Each爪 has its own limiting part that can be positioned against the valve seat end face, allowing the tool to be assembled and disassembled in segments rather than as a single unit, thereby facilitating easier removal despite the interference fit
2Force
If the puller tool is subjected to high pressure and impact load, then the pulling capability is improved, but the reliability of the tool deteriorates due to thread damage
Solution Approach 1:
The pulling force is distributed to two separate claws instead of concentrating it on a single tool body. Each爪 has its own thread engagement with the valve seat, so the total load is split into two independent load paths. This segmentation reduces the stress on individual threads and prevents single-point failure, thereby improving reliability under high pressure and impact conditions
Solution Approach 2:
The limiting parts of both claws are designed to abut against the valve seat end face, creating localized contact points that distribute the pulling load. This local quality enhancement at the contact interface prevents stress concentration on the threads, allowing the tool to withstand higher forces without thread damage
3Stability of the object's composition
If a clamp is used to secure the puller, then the stability during operation is improved, but the device complexity increases
Solution Approach 1:
The clamp component is completely removed from the tool design. Instead of using a clamp to secure the pulling mechanism, the invention relies on the two claws being independently insertable into the valve seat with their limiting parts abutting against the end face. This extraction of the clamp simplifies the overall device structure while maintaining operational stability through the distributed claw configuration
Data Source
AI summary
A puller includes a first claw and a second claw arranged opposite to each other. The first claw includes a first pulling part, a first limiting part and a first connecting part. The first limiting part includes a first body part, a first notch part and a second notch part. The second claw includes a second pulling part, a second limiting part and a second connecting part. The second limiting part includes a second body part, a third notch part and a fourth notch part. A size of the second pulling part is smaller than or equal to a size of the second notch part.