The invention discloses a variable-amplitude oil cylinder protection device, a variable-amplitude oil cylinder and a luffing jib tower crane. The variable-amplitude oil cylinder protection device comprises a hoisting mechanism and a variable-amplitude oil cylinder protection mechanism; one end of the variable-amplitude oil cylinder protection mechanism is hinged to the end of a piston rod of the variable-amplitude oil cylinder, and the other end of the variable-amplitude oil cylinder protection mechanism is provided with an embedded opening clamped with the piston rod; in the working state ofthe variable-amplitude oil cylinder protection mechanism, the hoisting mechanism releases a steel wire rope; and in a non-working state of the variable-amplitude oil cylinder protection mechanism, thehoisting mechanism withdraws the steel wire rope. The variable-amplitude oil cylinder protection mechanism is additionally arranged, so that stability instability of the variable-amplitude oil cylinder in a non-working state and any cargo boom displacement caused by the fact that the stress is larger and exceeds a safety pressure range are prevented, the stability of the variable-amplitude oil cylinder is maintained through direct bearing of the variable-amplitude oil cylinder body, meanwhile, a cargo boom is prevented from falling off due to failure of a locking valve of the variable-amplitude oil cylinder, and the reliability of the variable-amplitude oil cylinder is improved.
本发明公开了一种变幅油缸保护装置、变幅油缸及动臂塔式起重机,包括卷扬机构和变幅油缸保护机构;所述变幅油缸保护机构一端与变幅油缸的活塞杆端部铰接,所述变幅油缸保护机构另一端设有与所述活塞杆实现卡紧的嵌入口;在变幅油缸保护机构工作状态下:卷扬机构放出钢丝绳;在变幅油缸保护机构非工作状态下:卷扬机构将钢丝绳收回。本发明增加变幅油缸保护机构,防止在非工作状态下变幅油缸发生稳定性失稳以及受力较大超出安全压力范围导致的任何起重臂变位,通过变幅油缸体直接承载,维持变幅油缸的稳定性,同时,防止因变幅油缸锁止阀失效导致的起重臂坠落,提高变幅油缸可靠性。
Variable-amplitude oil cylinder protection device, variable-amplitude oil cylinder and luffing jib tower crane
一种变幅油缸保护装置、变幅油缸及动臂塔式起重机
2021-02-26
Patent
Electronic Resource
Chinese
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