Puller for fluid coupling maintenance

The design of a detachable threaded sleeve and an adjustable push rod solves the problems of thread damage and fixed push rod length in pullers, achieving the effects of reducing costs and improving disassembly efficiency.

WO2026113517A1 Publication Date: 2026-06-04HUANENG HAINAN POWER GENERATION CO LTD DONGFANG POWER PLANT
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Patent Information

Application Number
PCT/CN2025/114867
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-11-28
Filing Date
2025-08-14
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

The existing puller uses a one-piece cast connection module, which requires the entire module to be replaced when the threads are damaged, increasing costs; the push rod length is fixed and cannot adapt to hydraulic couplers of different depths, making it inconvenient to use.

Method used

The design incorporates a detachable threaded sleeve that connects to the connecting sleeve, allowing for individual replacement of the threaded sleeve. The push rod length is adjustable, with various lengths achieved through a combination of the lead screw and connecting seat, adapting to hydraulic couplings of different depths.

Benefits of technology

It reduces usage costs, minimizes waste of spare parts, improves disassembly efficiency and applicability, and facilitates the disassembly of different models of hydraulic couplings.

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Abstract

The present invention relates to the technical field of fluid coupling maintenance equipment. Disclosed is a puller for fluid coupling maintenance, comprising a hydraulic cylinder and a connecting sleeve. A screw rod is threadedly mounted inside the hydraulic cylinder. The connecting sleeve is sleeved on the outside of the screw rod. A threaded sleeve is provided inside the connecting sleeve. The threaded sleeve extends outwards from an end portion of the connecting sleeve away from the hydraulic cylinder, and the threaded sleeve is detachably connected to the connecting sleeve. An end portion of the screw rod proximal to the connecting sleeve is movably inserted into the threaded sleeve. An ejector rod having an adjustable length is disposed on the end portion of the screw rod inserted into the threaded sleeve. The ejector rod is arranged to extend out of the threaded sleeve. In the present invention, the connecting sleeve and the threaded sleeve are detachably connected, such that the threaded sleeve can be easily replaced when threads on the threaded sleeve are damaged. The screw rod is provided with an ejector rod having an adjustable length, so as to adapt to disassembly of different models of fluid couplings. The invention provides the advantages of reduced usage costs, ease of use, and improved disassembly efficiency.
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