本文件规定了制造商拟用支腿和柱塞的安全要求。包括支腿、支撑闸板和闸板，包括机械延伸件、内部阀门和安全装置、密封件、液压连接件（至第一软管管线或设计B的阀门，见EN 1804-3:2020）及其吊点，但不包括保护管和防尘罩，外部阀门、液压和电液控制系统。 注:本标准系列的其他部分讨论了一些组件。 本文件适用于在-10°C至60°C环境温度下使用的支腿、支撑柱塞和油缸。 本文件确定并考虑到: -支腿、支撑闸板和闸板操作可能造成的危险； -可能导致任何类型危险的危险区域和操作条件； -可能导致伤害或损害健康的危险的情况； -矿井瓦斯和/或易燃粉尘可能造成的危险。 本文件描述了减少这些危险的方法。 第4条列出了所讨论的危害。 本文件未规定以下任何附加要求: -特殊腐蚀性环境； -与制造和退役相关的风险； -地震。 完整的液压车顶支架由支撑装置（EN 1804-1:2020）、支腿和支撑油缸（EN 1804-2:2020）以及液压和电液控制装置（EN 1804-3:2020）组成。本多部分文件的每一部分都阐述了本多部分系列各部分范围内所述组件的安全要求。 本文件不适用于出版日期前制造的支腿和闸板。

This document stipulates the safety requirements for use of legs and rams as intended by the manufacturer. These include legs, support rams and rams, including the mechanical extensions, the inner valves and safety devices, seals, the hydraulic connections (up to the 1st hose line or to the valve of design B, see EN 1804-3:2020) and their lifting points, but excluding protective pipes and gaiters, external valves and hydraulic and electrohydraulic control systems. NOTE Some components are discussed in other parts of this standard series. This document applies for legs, support rams, and cylinders that are used at ambient temperatures between -10 °C and 60 °C. This document identifies and takes account of: - possible hazards which may be caused by the operation of legs, support rams and rams; - the hazardous areas and the operating conditions that can cause any type of hazard; - the situations that can result in hazards that cause an injury or impair health; - dangers that can be caused through mine gas and/or flammable dusts. This document describes methods for reducing these hazards. Clause 4 contains a list of the hazards discussed. This document does not specify any additional requirements for: - specially corrosive environments; - risks associated with manufacturing and decommissioning; - earthquake. A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020). Each part of this multipart document addresses the safety requirements of the components mentioned in the scopes of the respective parts of this multipart series. This document is not applicable to legs and rams manufactured before the date of its publication.