Detail of QB/T 5271-2018

Introduction of QB/T 5271-2018

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules given in the GB/T 1.1-2009. This standard was proposed by China National Light Industry Council. This standard is under the jurisdiction of National Technical Committee 101 on Light Industrial Machinery of Standardization Administration of China (SAC/TC 101) and National Technical Committee 480 on Furniture of Standardization Administration of China (SAC/TC 480). This standard is issued as first edition. Electric Height Adjustable Table 1 Scope This standard specifies the terms and definitions, requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of electric height adjustable tables. This standard is applicable to height adjustable tables for office and household. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 191 Packaging — Pictorial Marking for Handling of Goods GB/T 3325 Metal Furniture — General Technical Requirements GB 4706.1 Household and Similar Electrical Appliances — Safety — Part 1: General Requirements GB/T 4798.1 Environmental Conditions Existing in the Application of Electric and Electronic Products — Section 1: Storage GB/T 4798.2 Environmental Conditions Existing in the Application of Electric and Electronic Products — Section 2: Transportation GB 18584 Indoor Decorating and Refurbishing Materials — Limit of Harmful Substances of Wood Based Furniture QB/T 4288 DC Electric Linear Actuator 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 electric height adjustable table height adjustable table which is powered by electricity and driven by DC motor to adjust the expansion and contraction of table leg, so as to achieve the height adjustment of the table 3.2 stroke expansion distance of height adjustable table leg 3.3 lock status height adjustable table stops at a certain height in the stroke, it is locked 3.4 leveling device device that keeps a table top level. It Includes height adjustable table leg or similar devices 3.5 middle clear height unobstructed height from floor to table bottom (see Figure 1) Figure 1 Middle clear height of height adjustable table 4 Requirements 4.1 Permissible deviation The dimension deviation of products shall be in accordance with those specified in Table 1. Table 1 Permissible deviation No. Item Requirements 1 Perpendicularity of adjacent side of table top and frame /mm < Diagonal length ≥1000mm 3 Diagonal length <1000mm 2 Length of opposite side ≥1000mm 3 Length of opposite side <1000mm 2 2 Permissible level deviation of table top (‰) ≤ 5 3 Permissible deviation of stroke (mm) ±2 4 Permissible deviation of middle clear height ±10 4.2 Appearance requirements The appearance of height adjustable table shall meet those specified in GB/T 3325. 4.3 Mechanical properties The mechanical properties of products shall be in accordance with those specified in Table 2. Table 2 Requirements for mechanical properties No. Item Requirements 1 Vertical stability Shall not be dumped 2 Vertical strength 1) Components and parts shall be free from fracture or crack; 2) They shall be free from deformation with strong impact on use functions; 3) The connecting position shall be free from looseness; 4) The lifting function shall be continuous and smooth; 5) Hardware shall be free from obvious deformation and damage. 6) Some components to be pressed by hands shall be firm and shall be free from permanent looseness; 3 Horizontal strength 4 Horizontal durability 5 Drop test 6 Unilateral load When the unilateral load of height adjustable table is 1000 N, the height deviation between the two short sides of the height adjustable table top shall not more than 5 mm 7 Backoff When the height adjustable table runs, it can run in the opposite direction with a protection distance of (20±10)mm when encountering obstacles 8 Durability of lifting mechanism The lifting function shall be continuous and smooth. During the test, there is no sliding phenomenon when the lifting mechanism is in static status 4.4 Requirements for limit of harmful substances The limit of harmful substances shall be in accordance with GB 18584. 4.5 Electrical safety performance 4.5.1 The electrical strength requirements of height adjustable table shall be in accordance with GB/T 4706.1. 4.5.2 Working system protection: If the continuous lifting time of height adjustable table is more than 4 min, the lifting protection device shall be started automatically. 4.5.3 Height adjustable tables shall be equipped with abnormal position signal protection. 4.6 Properties of linear actuator The properties of electric linear actuator shall meet the requirements of QB/T 4288.

Contents of QB/T 5271-2018

Foreword II 1 Scope 2 Normative References 3 Terms and definitions 4 Requirements 5 Test Methods 6 Inspection Rules 7 Marking, Packaging, Transportation and Storage