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    • 73. 发明公开
    • METHOD FOR TIGHTENING A THREAD JOINT
    • EP3382215A1
    • 2018-10-03
    • EP17163298.7
    • 2017-03-28
    • Melnikov, Mikhail Borisovich
    • Melnikov, Mikhail Borisovich
    • F16B31/04F16D1/00F16B33/02F16B33/04
    • B23P19/061B23P2700/11E21B19/16F16B31/04F16B33/02F16B2033/04F16D1/00
    • The invention relates to thread joints and can be used in mechanical engineering, equipment construction, the oil and gas industry and communal utility systems.
      A method for tightening a thread joint of a base part with a small thread pitch and a part to be attached with a large thread pitch by rotation in screw-in direction of a differential thread connector, comprising portions of a one-directional thread corresponding to the threads of the base part and the part to be attached. The differential thread connector is formed in such a way that it can be screwed on the small thread of the base part to a predetermined length, subsequently the part to be attached is screwed on the large thread of the differential thread connector until contact with the base part is reached, and the preliminary tightening is carried out in screw-in direction, and subsequently the differential thread connector is rotated in screw-out direction and the final tightening is carried out. For instance, the method is applicable for tightening two cylindrical parts, one part 1 with a threaded portion with a pitch S1 and a plane contact surface 4, to another part 2 with a threaded portion with a pitch S2 and a plane contact surface 5, the thread pitch S2 being larger than the pitch S1 by an amount of ΔS = S2 - S1. A differential thread connector 3 is formed as a coupling with portions with an inner thread with pitches S1 and S2. The method for tightening a thread joint is carried out as follows. The part 1 with the thread pitch S1 is screwed into a threaded aperture of the differential thread joint 3 to a predetermined length A. Subsequently the part 2 with the thread pitch S2 is screwed into the differential thread connector 3 from the opposite end until coupling of the contact surface 5 of the part 2 with the contact surface 4 of the part 1 is reached. In this position the preliminary tightening of the joint with a torque M1 in the direction of the arrow 6 (screw-in) is carried out. Further, while the part 2 is kept immobile, the differential thread connector 3 is rotated around the arrow 7 (screw-out), and the final tightening of the joint is carried out with a torque M2 > M1.
      The technical result is an increase of the strength of the joint by an increase of the tightening force of the parts to be attached.
      1 independent claim, 6 dependent claims, 16 drawings.
    • 79. 发明公开
    • EXCAVATOR PIVOT APPARATUS PROVIDED WITH PIVOT THRUST PREVENTION DEVICE
    • BAGGERGELENKVORRICHTUNG MIT EINER GELENKSCHUBVORBEUGUNGSVORRICHTUNG
    • EP2837744A1
    • 2015-02-18
    • EP13866481.8
    • 2013-11-11
    • Hyundai Heavy Industries Co., Ltd.
    • SHIN, Kyung Chul
    • E02F9/12E02F9/20
    • E02F9/128E02F9/202E02F9/2025E02F9/226E02F9/2285E02F9/265F16D1/00
    • Provided is a swing device of an excavator having an anti-sliding device, which includes a brake channel connected to a hydraulic chamber of a brake piston, a select valve for connecting the brake channel to a brake hydraulic port or a delay channel, a spring compartment channel having one side connected to a spring compartment of the brake piston and the other side connected to one point of the delay channel, a check valve provided at the spring compartment channel to allow a hydraulic pressure to be supplied only in a direction from the delay channel toward the spring compartment, a spring compartment bypass channel for connecting one point of the spring compartment channel between the spring compartment and the check valve and one point of the spring compartment channel between the check valve and the delay channel, an anti-sliding valve provided at the spring compartment bypass channel to block or open the spring compartment bypass channel, a slope detection sensor provided at one side of the excavator to sense a slope, and an anti-sliding valve controller for blocking the anti-sliding valve when the excavator located on a slope and opening the anti-sliding valve when the excavator is located at a place other than a slope, based on slope information of the slope detection sensor.
    • 提供一种具有防滑装置的挖掘机的摆动装置,其包括连接到制动活塞的液压室的制动通道,用于将制动通道连接到制动液压端口或延迟通道的选择阀,弹簧 隔间通道的一侧连接到制动活塞的弹簧室,另一侧连接到延迟通道的一个点;止回阀,设置在弹簧室通道处,以允许液压仅沿着从 延伸通道朝向弹簧室,弹簧室旁通通道,用于连接弹簧室和止回阀之间的弹簧室通道的一个点以及止回阀和延迟通道之间的弹簧室通道的一个点,防滑 设置在弹簧室旁路通道处的阀,以阻挡或打开弹簧室旁通通道,一个设置的斜坡检测传感器 挖掘机用于感测坡度的侧面,以及当挖掘机位于斜坡上并且当挖掘机位于除了斜坡之外的位置时打开防滑阀的防滑阀的防滑阀控制器, 基于斜率检测传感器的斜率信息。