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1. Description

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Applicable models XCMG QY25K5C_2 QY70KC QY50KC QY25K5D_2 QY25KC XCT35_BR QY25K5D_3 QY25K5D_3 QY25K5C_1 QY55KC_1 QY25K5F_1 QY50KC QY50K5C_1 QY25K5C_2 QY25K5F qy25k5c qy25k5d_2 qy30kc qy55k5c_2 qy25k5f_1 qy25k5d_1 qy30kc qy55k5d
XCT80L6 XCT130_1 XCT12 XCT80L6 XCT25L4_S XCA40_M XCA30_JY XCT25L5_3 XCT55L5 XCT110_1 XCT60L6 XCT12 XCT25L5_SR XCT25L5_2 XCT95L7 XCT75L7 QY110K8C  QY95K7C QY110K7C XCT100 XCT75_S QY40KC XCT90 XCT25 XCT25L5_E QY70KC QY40K5C_2 XCT60L6_1 QY75KC QY100K7C QY95KH QY100K6C QY50JW XCT16_1 XCT100_BR  XCT60 QY20K5D QY85KC XCT25 XCT80L5 XCT100 XCT20L5_1 XCT75L6 XCT20L5 XCT80_S XPD36 QY16KC QY16KC QY40K5D_1 QY25K5L XCA40 QY40KD QY80K5D QY70K5D_1   QY50KD QY20K5C XCT50_Y XCT16_Y XCT25L4_Y XCT80_Y XCT60_Y XCT50_Y and other XCT QY RT series models.

Wedge joints are generally made of carbon cast steel whose material is not lower than ZG 35Ⅱ specified in GB979-67 (classification and technical conditions of carbon steel castings), and has been scientifically heat treated to obtain higher comprehensive strength and durability.
According to Article 9.4.1.1.6 of GB/T 3811-2008 “Code for Design of Cranes”, “When using wedge blocks and wedge sleeves to connect, the wedge sleeves should be made of steel, and the connection strength should not be less than 75% of the breaking force of the wire rope”.
Wedge joints are generally made of casting or integral forging, and are mainly composed of three parts: wedge sleeve, wedge core and horizontal pin. The surface should be smooth and flat, the sharp edges and risers should be removed, and there should be no defects that reduce the strength and obviously damage the appearance (such as pores, cracks, looseness, slag inclusion, sand inclusion, casting scars, etc.), and the wedge joints should be rust-proof deal with.
Two samples of wedge joints of each nominal size must be taken for tensile testing before production. During the test, preload is performed first, and then gradually loaded to the breaking load. During the loading process, the length of the free end of the steel wire cannot be shortened. After the test, the wedge sleeve and wedge are not allowed to appear cracks or any other damage that affects the use.
In batch production, the wedge joints of each nominal size must also be tested at the factory. The number of tests is 2% of the batch, and the absolute number is not less than 2. All test pieces must meet the requirements, then the batch of products If one of the products does not meet the requirements, the sampling test must be doubled. If the test does not meet the requirements, the batch of products is unqualified.