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GB/T 30574-2021: Safety of machinery - Implementation criteria for safeguarding Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 30574: Historical versions
Similar standardsGB/T 30574-2021: Safety of machinery - Implementation criteria for safeguarding---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT30574-2021GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.110 CCS J 09 Replacing GB/T 30574-2014 Safety of Machinery – Implementation Criteria for Safeguarding Issued on: DECEMBER 31, 2021 Implemented on: JULY 1, 2022 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 4 Introduction... 6 1 Scope... 8 2 Normative References... 8 3 Terms and Definitions... 9 4 General Principles... 12 4.1 Risk assessment... 12 4.2 Implementation principles... 12 4.3 Implementation process... 13 5 Safeguarding Methods... 14 5.1 General requirements... 14 5.2 Minimum spacing safeguarding method... 14 5.3 Maximum spacing safeguarding method... 14 5.4 Safe-opening safeguarding method... 15 5.5 Safe-location safeguarding method... 15 6 Guards... 15 6.1 General requirements... 15 6.2 Fixed guards... 16 6.3 Movable guards... 16 6.4 Adjustable guards... 16 6.5 Interlocking guards... 17 7 Protective Devices... 17 7.1 General requirements... 17 7.2 Interlocking devices... 17 7.2.1 General requirements for the interlocking devices... 17 7.2.2 Interlocking device with guard locking... 18 7.3 Enabling device... 18 7.3.1 Design and construction... 18 7.3.2 Installation, operation and maintenance... 19 7.4 Hold-to-run control device... 20 7.4.1 General requirements... 20 7.4.2 Design and construction... 21 7.4.3 Installation, operation and maintenance... 21 7.5 Two-hand control device... 22 7.5.1 General requirements... 22 7.5.2 Installation, operation and maintenance... 23 7.6 Sensitive protection equipment... 24 Safety of Machinery – Implementation Criteria for Safeguarding1 ScopeThis Document specifies the general principles of safeguarding, the adopted safeguarding methods and supplementary protection measures, the used guards and protective devices; and provides use information on safeguarding, etc. This Document applies to the design, construction, installation, inspection, implementation and maintenance of mechanical equipment safeguarding; and is also applicable to the preparation of safety operating procedures and the training of relevant personnel. This Document does not specify the requirements for the selection of safeguarding for specific purposes, which are usually specified in Class-C standards.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 8196-2018 Safety of machinery – Guards - General requirements for the design and construction of fixed and movable guards GB/T 12265-2021 Safety of machinery - Minimum gaps to avoid crushing of parts of the human body GB/T 15706-2012 Safety of machinery - General principles for design - Risk assessment and risk reduction GB/T 16754-2021 Safety of machinery - Emergency stop function - Principles for design GB/T 16855.1-2018 Safety of machinery - Safety-related parts of control systems - Part 1.General principles for design GB/T 17454.1-2017 Safety of machinery - Pressure-sensitive protective devices - Part 1.General principles for design and testing of pressure-sensitive mats and pressure sensitive floors b) The maximum spacing shall not exceed 4mm. 5.4 Safe-opening safeguarding method When the workpiece is considered as part of the safeguarding, any opening shall prevent personnel from reaching the identified hazard. When adopting the safe-opening safeguarding method, the requirements are as follows. a) When the workpiece is in place, the remaining opening shall be small enough to prevent any part of the operator's body from entering the dangerous zone; b) If the dangerous zone can be approached because the workpiece is not in place, measures shall be taken to prevent the machine cycle from being started when the workpiece is not in place. Such measures shall achieve the risk reduction level determined by the risk assessment. 5.5 Safe-location safeguarding method The determination of the safe location shall be calculated according to Appendix C. When adopting the safe-location safeguarding method, the requirements are as follows. a) For the case of unintentional approach to the dangerous zone from the working plane, the dangerous zone shall be high enough and/or far enough; b) If the location of the identified hazard is clear, the access to the dangerous zone shall be limited by means of closure, isolation, etc.6 Guards6.1 General requirements The design, construction and selection of guards shall comply with the relevant provisions of Clauses 5 to 7 in GB/T 8196-2018. If the dangerous zone needs to be observed, a transparent guard or metal mesh with sufficient strength shall be selected according to the risk assessment results. When selecting a metal mesh, the color of the metal mesh shall be darker than the color of the observed area, such as black. After the machine is repaired, modified or moved, a risk assessment shall be re-performed in accordance with Clause 5 of GB/T 15706-2012 to ensure that the repaired, modified or reinstalled guard is still effective. 6.2 Fixed guards 6.2.1 Before operating the machine or causing hazard, ensure that the fixed guards have been correctly installed. 6.2.2 The fixing methods of the fixed guards should be adapted to the specific application. The common fixing methods include welding, bonding or fastener connection, etc. 6.2.3 If fasteners are used for fixing, in order to ensure that the fixed guards can only be removed by special tools; fasteners that can be opened by ordinary tools such as slotted screws, cross screws, butterfly nuts, and snaps shall not be used. 6.2.4 For fixed guards (such as protective covers) fixed by fasteners, measures shall be taken to ensure that the fasteners remain on the fixed guards after the fixed guards are removed. The anti-drop fasteners given in Appendix A of GB/T 8196-2018 should be used. 6.3 Movable guards 6.3.1 For the movable parts of the movable guards, if it can approach the hazardous area after opening, the following measures shall be taken. a) The movable part is interlocked, and the movable guards shall meet the requirements of the interlocking guards; b) It is firmly fixed and prevented from unauthorized modification. If it is impossible to interlock or prevent unauthorized modification, the fixing method of the movable guards shall be suitable for the specific application and can reduce the risk to an acceptable level determined by the risk assessment. 6.3.2 The movable guards shall not be opened towards the danger or dangerous zone. 6.4 Adjustable guards 6.4.1 The adjustable guards shall. --- Be adjustable at any time; --- Maintain the adjusted state during a given operation; --- Be correctly installed and adjusted before operating the machine or causing danger; --- Be only adjusted with authorization. 6.4.2 Operators and maintenance personnel of adjustable guards shall be trained and shall understand the purpose of adjustable guards. 6.5 Interlocking guards 6.5.1 Interlocking guards shall not be able to close and activate the interlocking circuit automatically. If the guard is kept open by the elastic force of the spring, the interlocking circuit shall be designed to be manually restarted. 6.5.2 When the interlocking guard is closed, the interlocking device shall not trigger the dangerous movement of the machine and can only be triggered after manual restart. 6.5.3 When the interlocking guard is opened, the stop command shall be triggered immediately. The interlocking guard shall always protect the dangerous state it protects until the interlocking guard is closed. 6.5.4 The interlocking device of the interlocking guard shall comply with the provisions of 7.2. 6.5.5 The interlocking guard shall be prevented from being opened before the dangerous state ends; and when the interlocking protective device is opened, it shall be ensured that personnel cannot reach the dangerous zone before the dangerous state ends. 6.5.6 If the interlocking guard adopts an interlocking device with protective locking, the interlocking device shall comply with the provisions of 7.2.2. 6.5.7 The interlocking guard shall have at least one interlocking device with a forced disconnection mode.7 Protective Devices7.1 General requirements The safety function of the guard shall be realized by the safety-related parts of the machine control system. The performance level (PL) and category of the safety-related parts of the control system (SRP/CS) shall comply with the provisions of 4.5 and Clause 6 of GB/T 16855.1-2018.For examples of determining the required performance level (PLr) of the SRP/CS, see Appendix A of GB/T 16855.1-2018. 7.2 Interlocking devices 7.2.1 General requirements for the interlocking devices 7.2.1.1 The design and selection of the interlocking devices shall comply with the provisions of Clauses 5 and 6 of GB/T 18831-2017. 7.2.1.2 Unless the interlocking device is used only to prevent accidental start-up, the 7.3.1.2 The force/pressure required to activate the enabling device shall not itself be dangerous. The design and construction of the enabling device shall not cause the following hazards. --- Cutting, puncture; --- Crushing; --- Radiation; --- Electromagnetic interference; --- Electric shock. 7.3.1.3 The design and installation of enabling devices shall follow ergonomic principles (force, posture, etc.). 7.3.1.4 The enabling device shall adopt three positions and shall allow the machine to operate when the middle enabling position is pressed continuously. The release of the enabling device or pressing through the middle enabling position shall trigger an immediate stop command for the dangerous movement or situation. The enabling function shall only be activated when it is actuated from position 1 to position 2. NOTE. Position 1 (released or unoperated) is closed, position 2 (midpoint) is opened, and position 3 (operated through midpoint) is closed. When returning from position 3 to position 2, this function is not enabled. 7.3.1.5 The enabling device shall not be affected by environmental conditions. 7.3.1.6 The design and construction of the components, assemblies and modules of the enabling device shall achieve the risk reduction level determined by the risk assessment. 7.3.2 Installation, operation and maintenance 7.3.2.1 The enabling device shall be properly operated in accordance with the manufacturer's recommendations during installation, operation and maintenance. For enabling devices as supplementary protection measures when safeguarding is bypassed, it shall be ensured that only trained and qualified personnel can operate the enabling devices in accordance with safe operating procedures. 7.3.2.2 The selection of enabling devices shall prevent. --- unauthorized selection; --- deselecting the enabling device during use. 7.3.2.3 The machine control system shall ensure that only one drive controller or workstation can start the machine operation when the enabling device is used. NOTE. The enabling device does not start the machine movement. Its function is only to start the drive controller or start at the workstation to limit the possibility of accidental machine function. 7.3.2.4 For situations where multiple people are in the dangerous zone, if enabling devices are used for safeguarding them, each person shall be equipped with their own enabling device. In addition, each selected enabling device shall be operated simultaneously before the machine movement can be started, and all selected enabling devices need to be released and operated again to start the machine movement. 7.3.2.5 It shall be ensured that each enabling device is inspected, checked or adjusted in accordance with the manufacturer's recommendations and the procedures established by the user. All necessary adjustments, repairs and maintenance shall be completed before starting the machine movement. 7.3.2.6 When the enabling device is interrupted during the machine cycle, the enabling device shall issue an immediate stop command to the machine control system. The machine shall be restarted in normal start mode before starting or continuing to move. 7.3.2.7 The control device that returns the machine to normal mode shall be located outside the dangerous zone to ensure that it cannot be touched in the dangerous zone, and the machine shall not return to normal mode before there are no people in the dangerous zone. 7.4 Hold-to-run control device 7.4.1 General requirements 7.4.1.1 The applicable working conditions of the hold-to-run control device are as follows. --- The hold-to-run control device is the only control device for dangerous movement; --- The hold-to-run control device is used by personnel exposed to dangerous conditions; --- The hold-to-run control device is used for safeguarding. NOTE. The typical application of the hold-to-run control device is to reduce risks in conjunction with other supplementary equipment and measures or other methods (such as deceleration, power/force reduction, step-by-step operation, etc.). 7.4.1.2 When the hold-to-run control device is used in conjunction with other supplementary equipment, supplementary measures or safeguards (such as two-hand operating devices, enabling devices, etc.), the hold-to-run control device shall only be used as a logical device and shall not be used as a component that performs safety functions in the safety-related 7.4.3.3 It shall be ensured that when the safety-related parts of the machine control system are bypassed, only a hold-to-run control device can start the machine operation. The hold-to- run control device shall be located in the dangerous location where the safeguarding is bypassed. For occasions where the same machine function may be started by several drive controllers, the control circuit shall be set up so that the selected controller is only effective at a given time. 7.4.3.4 If multiple people are exposed to danger, only one person shall be allowed to operate the hold-to-run control device, and an enabling device shall be provided for all others. 7.4.3.5 The user shall ensure that each hold-to-run control device can be operated in accordance with safe working procedures; and all necessary adjustments, repairs and maintenance work on the machine shall be completed before operating the machine. The manufacturer's recommendations should be followed when establishing safe working procedures, and within the scope of direct control of the hold-and-run control device, the user should also decide whether an emergency stop device is required based on risk assessment. 7.4.3.6 The design and construction of the interface or machine control system components, assemblies or modules shall meet the performance level determined by the risk assessment. 7.4.3.7 The above requirements of 7.4.3 do not apply in the following cases. --- If the hold-and-run control device is used with the enabling device and is operated by the same person; --- When the hold-and-run control device is used with the protective device. 7.5 Two-hand control device 7.5.1 General requirements 7.5.1.1 The selection, safety function and control category requirements of the two-hand control device shall comply with the provisions of Clauses 4 to 6 of GB/T 19671-2005. 7.5.1.2 Unless the two-hand control device is used only to prevent accidental start-up or is used as a hold-and-run control device, the two-hand control device shall ensure that personnel cannot reach the dangerous zone before reaching a safe state. 7.5.1.3 Two-hand control devices shall ensure that the machine cycle can only be restarted by actuating the control actuators again after the operator releases all control actuators. 7.5.1.4 Two-hand control devices using single-cycle mode shall have anti-repeat performance. EXAMPLE. For a two-hand trigger device, the performance of the integrated system consisting of a two-hand trigger and a drive or clutch mechanism can achieve an anti-repeat function. 7.5.1.5 When a two-hand control device (operator station) is selected, the operator shall be provided with a way to indicate whether the two-hand control device is selected or not selected. 7.5.2 Installation, operation and maintenance 7.5.2.1 The distance between the control actuator of the two-hand control device and the nearest dangerous zone shall be no less than the minimum distance calculated according to Appendix C, so that the operator cannot reach the dangerous zone before the dangerous movement stops. 7.5.2.2 The operator shall not be able to operate the control actuator with the hand and elbow (or other part) on the same arm. EXAMPLE. Separate the control actuators with a linear distance of no less than 550mm. 7.5.2.3 If a two-hand control device is used to safeguard more than one operator, each operator shall have his own control actuator, and the machine cycle can only be started when each operator operates the control actuator at the same time. Each operator shall be provided with a way to indicate whether his manual controller is selected or not. If the unselected two-hand control station causes a danger or dangerous state, other protective measures shall be taken. 7.5.2.4 To ensure the normal operation of the actuator, the following factors that may cause it to malfunction shall be tested or inspected regularly. --- Whether spring wears or breaks; --- Whether there is the influence from impurities, dirt or other environmental factors; --- Whether the action of the drive is slow, sticky or stuck; --- Whether the downtime is consistent with the set time; --- Whether there is an erroneous conduction condition. For other tests or inspections, as well as requirements relevant to test and inspection records, see 9.2. 7.5.2.5 The design and construction of components, assemblies or modules of the interface or machine control system shall meet the performance level determined by the risk assessment. --- Cover the controller with a locked cover; --- Use a controller that requires a tool or password to access. Adjustments or configurations should only be performed by authorized personnel. Adjustments or configurations can use functions or methods as follows. --- Inhibit; --- Configuration; --- Reset function; --- Adjustment of object resolution. 7.6.1.2.2 It should not be possible for a person to enter the dangerous zone from above, below or around the pressure-sensitive mat or pressure-sensitive floor without stepping on the effective sensitive area of the pressure-sensitive mat or pressure-sensitive floor. These zones shall be protected by other safeguarding measures such as guards. The effective sensitive area shall be of sufficient length and width to detect any person entering the dangerous zone. If a person can be between the effective sensitive zone and the dangerous zone, the pressure- sensitive mat or pressure-sensitive floor should be used in conjunction with supplementary protection to prevent the person exposure to the dangerous zone. 7.6.1.2.3 The location of the pressure-sensitive mat or pressure-sensitive floor shall ensure that its effective sensitive area prevents personnel from entering the dangerous zone during the dangerous phase of the machine cycle. The installation position of the pressure-sensitive mat or pressure-sensitive floor from the dangerous zone shall be calculated according to the calculation method specified in Appendix C. It shall be ensured that only authorized personnel can conduct reposition and installation of the pressure-sensitive mat or pressure-sensitive floor. Methods to prevent accidental movement of the pressure-sensitive mat or pressure-sensitive floor include but are not limited to. --- Reinforce the edge; --- Trimming the edge to ensure safety; --- Fix with fasteners; --- Grooves; --- Increase the size and weight of the pressure-sensitive mat or pressure-sensitive floor. 7.6.1.2.4 When a person is detected in the effective sensitive area of the pressure-sensitive mat or pressure-sensitive floor during the dangerous phase of the machine cycle, the pressure- sensitive mat or pressure-sensitive floor shall be able to protect the person by triggering an immediate stop command of the machine control system, and the machine control system shall be manually reset before starting or continuing the machine movement. The operator shall ensure that no person is in the safeguarding zone before resetting the pressure-sensitive mat or machine controller and before starting the dangerous movement of the machine. The resetting device shall be installed outside the safeguarding zone and cannot be touched in the safeguarding zone. The pressure-sensitive mat or machine controller shall be reset only after verification that there are no persons in the safeguarding zone. 7.6.1.2.5 Where the pressure-sensitive mat or pressure-sensitive floor is connected together using a sensor strip at the joint, it shall be ensured that there is no foreign matter under the sensor strip to prevent its activation. 7.6.1.2.6 The pressure-sensitive mat or pressure-sensitive floor shall not allow or enable the start or continuation of the dangerous movement of the machine simply by indicating that the person is in a safe position relative to the danger. NOTE. Pressure-sensitive mats or pressure-sensitive floors are not used as enabling signals for the following three main reasons. --- Placing a heavy object on the pressure-sensitive mat or pressure-sensitive floor will bypass the intended safety function; --- A malfunction of the pressure-sensitive mat or pressure-sensitive floor controller shall result in a false enabling signal; --- To prevent other persons from being exposed to danger, everyone on the pressure-sensitive mat or pressure-sensitive floor needs to start the dangerous movement of the machine at the same time. 7.6.2 Pressure-sensitive edge 7.6.2.1 General requirements 7.6.2.1.1 The design, testing and verification of the pressure-sensitive edge shall comply with the provisions of Clauses 4 and 7 in GB/T 17454.2-2017. 7.6.2.1.2 The minimum object resolution of the pressure-sensitive edge shall be sufficient to detect a person at any position on its effective sensitive zone. The manufacturer shall indicate the amount of force or pressure on a given area required to activate the pressure-sensitive ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 30574-2021 be delivered?Answer: The full copy PDF of English version of GB/T 30574-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 30574-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 30574-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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