GB/T 25629-2021Hydraulic excavator—Central turning joint (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB/T 25629-2010 "Central Swivel Joint for Hydraulic Excavators". Compared with GB/T 25629-2010, except for the In addition to structural adjustments and editorial changes, the main technical changes are as follows:

--- Modified the scope of application (see Chapter 1, Chapter 1 of the:2010 edition);

--- Modified the product classification (see Chapter 4, Chapter 4 of the:2010 edition);

--- Modified the requirements (see Chapter 5, Chapter 5 of the:2010 edition);

--- Modified the test method (see Chapter 6, Chapter 6 of the:2010 edition);

--- Modified the inspection rules (see Chapter 7, Chapter 7 of the:2010 edition).

1 Scope

This document specifies the classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of central rotary joints for hydraulic excavators lose and so on.

This document applies to central swivel joints for hydraulic excavators, cranes, aerial work vehicles, shield machines, rotary drilling rigs, motor graders, offshore The central rotary joints for mechanical equipment such as industrial platforms can be used for reference.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 2828.1 Counting Sampling Inspection Procedure Part 1. Lot-by-Lot Inspection Sampling Plan Retrieved by Acceptance Quality Limit (AQL)

GB/T 7932 General rules and safety requirements for pneumatic systems and their components

GB/T 7935 General Specifications for Hydraulic Components

GB/T 13306 Signs

GB/T 14039-2002 Hydraulic transmission oil solid particle pollution grade code

GB/T 17446 Vocabulary of fluid transmission system and components

GB/T 17489 Hydraulic particle pollution analysis Extracting liquid samples from working system pipelines

JB/T 7858 Hydraulic component cleanliness assessment method and hydraulic component cleanliness index

3 Terms and Definitions

GB/T 17446 as well as the following terms and definitions apply to this document.

4 Marks