ISO 11901-5:2021 Tools for pressing — Gas springs —Part 5: Safety instructions for gas springs
标准简介
Tools for pressing — Gas springs —Part 5: Safety instructions for gas springs是于2021-03发布的ISO标准,适用于世界范围。标准截图

标准文档说明
标准文档类型为Tools for pressing — Gas springs —Part 5: Safety instructions for gas springs高清PDF版本(文字版),标准文档内可进行搜索,可以复制原文,可粘贴。标准部分原文
Tools for pressing — Gas springs —
Part 5: Safety instructions for gas springs
1 Scope
This document describes the safety requirements for gas springs in accordance with ISO 11901-1, ISO 11901-3 and ISO 11901-4 intended for use in press tool and their correct installation instructions.
The instructions and operating conditions described in Annex A help to maximise lifetime and ensure the safe operation of nitrogen gas springs.
2 Normative references
There are no normative references in this document.
3 Terms a nd definiti ons
No terms and definitions are listed in this document
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http://w ww .electropedia. org/ 4 Safety protection for nitrogen gas springs
4.1 General
Incorrect use of nitrogen gas springs can pose a risk to people and the machine/die.
Some potential causes of damage and the mode of operation of the protection equipment used to avoid them are described in 4.2 to 4.4.
4.2 Uncontrolled return stroke safety protection
It is possible that the piston rod of the nitrogen gas spring does not immediately follow the return stroke of the press: this can be caused by a jammed tool part or cam (see Figure 1). As a result, when the jammed part is released, the piston rod of the nitrogen gas spring exceeds the permitted speed during the return stroke and the piston rod slams unchecked onto the final stop (return stroke of the rod pushing out the jammed part without stamping counterforce). This can seriously damage the nitrogen gas spring or cause it to fail. To avoid this, nitrogen gas springs shall be designed to vent the gas to the atmosphere – thereby depressurizing the spring – in the event that the maximum permitted piston rod speed is exceeded. This reduces the risk of injuries caused by the ejection of gas spring parts.
Figure 1 — Return stroke of nitrogen gas spring without counterforce
4.3 Overstroke safety protection
Overstroke occurs when the piston rod is pushed deeper into the gas spring body than nominal stroke. This could damage the gas spring (see Figure 2) and cause sudden dislocation of spring body (e.g. the spring base). Therefore, gas springs shall be designed to vent the gas to the atmosphere in a controlled manner in the event of overstroke.
Figure 2 — Damaging of the gas spring due to overstroke
4.4 Overpressure safety protection
If the pressure inside gas springs rises above the permitted limit, due to fluid penetration or incorrect charging, gas springs can break away. Therefore, gas springs shall include overpressure protection.
When the overpressure protection system is triggered, the gas is vented to the atmosphere.
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