MT 312-2000 in English

VALID

General specification for powered support

Issued on:2000-12-08
Implemented on:2001-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $280.00
$272.00

Standard No:	MT 312-2000
Document status:	VALID
Title in English:	General specification for powered support
Title in Chinese:	液压支架通用技术要求
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2000-12-08
Implemented on:	2001-05-01
ICS Classification:	73.100-Mining equipment
Chinese Classification:	D97-Mine support equipment
Professional Classification:	MT-Coal
Related Keywords:	performance column pressure maintenance zero pressure drop powered support introduction background versionimprovement range test items23 items31 items+34.8 % sealing requirements5min pressure drop hydraulic support
Related Topics:	30 pieces of science and technology support Support technical parameters General technical conditions for bridge erecting machines Mining hydraulic support joint Stacking of hydraulic supports Hydraulic support liquid pipe Hydraulic support design Hydraulic support industry American hydraulic support Liquid cooling technology general technology

本标准规定了矿用液压支架（以下简称支架）的通用技术要求、试验方法、检验规则、标志、包装、运输、贮存。
本标准适用于煤矿综采工作面用液压支架。

Introduction

Background of Standard Revision and Technological Evolution

MT312-2000, as a revised version of MT312-1992, mainly strengthens the performance index system of hydraulic support:

Improvement dimensions	1992 version	2000 version	Improvement range
Test items	23 items	31 items	+34.8%
Sealing requirements	5min pressure drop ≤5%	Zero pressure drop	Absolute standard
Number of endurance tests	3000 times	5000 times	+66.7%

Core performance indicator system

4.2.3 Key indicators of sealing performance

Column pressure maintenance: zero pressure drop for 5 minutes at 90% of the rated working pressure
Natural retraction: the retraction amount of the active column after extending 2/3 and placing for 16 hours is ≤2mm
External leakage standard: no more than 1 drop of exudate within 5 minutes

4.2.6 Innovation points of strength test

Test items	Loading coefficient	Judgment standard
Main structural parts	1.2 times rated pressure	Residual deformation≤0.4%
Column socket loading	1.3 times rated pressure	Center line deviation≤3°
Guard plate test	1.3 times rated pressure	No functional deformation

Implementation suggestions and quality control

6.1 Type inspection trigger conditions

When finalizing and appraising new products
After major changes in structure/materials
Resuming production after 5 years of suspension

7.4 Special requirements for transportation

When the temperature is below 0℃, the antifreeze liquid must be replaced and key components such as columns and jacks must be treated for low temperature protection.

More samples: YD/T 3934-2021 JJG 21-2008 DL/T 368-2010

Sample only — not a preview of MT 312-2000