GB 28243-2012Hydraulic press brakes - Safety requirements (English PDF)

2.1 Charged with human body contact (direct contact) Electrical Equipment

2.2 Since the human body and under fault conditions becomes Into contact with live parts of the body (indirect contact) Electrical Equipment 4.3 5.8.1

3 thermal hazards

3.1 Thermal hazards to persons may reach production Health burns and scalds Hydraulic System Components 4.4 5.8.2

4.1 dangerous noise can cause hearing damage risk of hearing damage exists bender area 4.5 5.8.5

5 radiation risks

5.2 Basic design requirements

5.2.1 slider prevent accidental fall (acting on the bending machine)

5.2.1.1 should take one of the following measures to prevent accidents during operation of the slider whereabouts danger (gravity than 150N) arising from.

--- Mechanical support means;

--- Hydraulic support means;

--- Only a combination of hydraulic support means with a mechanical valve support means support. When the operator may enter the danger zone die, whenever slider to stop supporting means should be able to work automatically.

5.2.1.2 When the mechanical support device is not used but there is a risk of falling accidents slider, one of the following shall be a hydraulic support device consists of.

a) the use of two separate support slider or the return of the cylinder, each cylinder support means having the ability to support quality slider.

b) operate independently of each cylinder set two series of hydraulic valve support (ie, the cylinder should be set for each individual operation redundancy support valve). Hydraulic valve should be used to support other forms of welding flange or rigid pipe and the cylinder port connection, should not take the pressure mounting, cement circle Or other similar methods.

5.2.1.3 If the bending machine is equipped with a permit only one of the following ways of working hydraulic valves or mechanical support device support.

--- Automatic operation;

--- Fixed enclosing guards;

--- Only low closing speed - the dynamic control device.

5.2.1.4 whether the system should automatically detect the correct operation of the support means, and the system failure should not travel bending machine operation.

5.2.2 General requirements for hydraulic and pneumatic systems

5.2.2.1 Hydraulic and pneumatic systems should be consistent with GB/T 3766 and GB/T in 7932 safety requirements.

5.2.2.2 should be configured with a filter and pressure regulator valve.

5.2.2.3 should be designed to ensure that pressure is maintained within the allowable range. When subjected to pressure

5.2.2.4 transparent appliance (such as glass, plastic) without affecting the visibility of the case, it should be protected against accidental damage Injury to personnel.

5.2.2.5 All piping, pipe fittings, gas-liquid passage, fuel tank and hole machining burrs and debris should be removed.

5.2.2.6 pipeline should keep the connection open, should take measures to prevent damage due to thermal expansion, rigid conduit should be spaced a fixed support, To prevent vibration or movement. Avoid hose winding, irregular distortions.

5.2.2.7 pressure drop may result in unexpected slider dangerous actions should not be used at the hose; pipes and connections should be able to prevent pressure drops.

5.2.2.8 valve should not rely solely on the connecting pipe support.

5.2.2.9 Control valves and other control or display components (such as pressure regulators, pressure gauges, etc.) should be installed in easily accessible and easily damaged place. Action

5.2.2.10 manual valve or mechanical valve (as opposed to motorized control valve) should be flexible and reliable recovery, such as when the relief valve operating member, Valve automatically reply to a safe location.

5.2.3 Hydraulic System

5.2.3.1 As with controlled gravity fall fast closing the mold for the inner support cylinder block all hydraulic oil should flow through the main control valve Or with valve redundancy and monitoring system.

5.2.3.2 When a pressure mechanism stops working, the energy accumulator hydraulic system comprising an accumulator is not allowed to produce any dangerous move For, should allow fluid pressure drop, if not possible, the circuit should be equipped with a manual pressure relief valves, and comply with the relevant provisions of the accumulator required Other devices (such as safety valves and pressure gauges, etc.), and should be clearly labeled with the danger warning signs.

5.2.3.3 hydraulic circuit system should be used to protect the safety valve. Use tools to adjust the safety valve and the safety valve set pressure not 10% of the maximum working pressure of the system should be higher.

5.2.3.4 for acting on the bending machine, in order to avoid accidental pressure surge damage caused by the lower chamber of the cylinder should be used to set up a Valve cylinder lower chamber. The valve should belt locking device (such as seals) to prevent unauthorized adjustments. Set pressure valve should be at least higher than the Department The system maximum working pressure of 10%.

5.2.4 Electrical System

5.2.4.1 bending machine electrical equipment shall comply with the provisions of GB 5226.1. Such as power, environment and working conditions differ from the actual GB 5226.1-2008 specified in

4.3 and 4.4, the producer and the consumer should be resolved through consultation.

5.2.4.2 should belong to stop category 0 stop (see GB 5226.1-2008 of 9.2.5.4), the emergency stop should be able to stop all dangerous actions (such as Slider back gauge, care and other materials).

5.2.4.3 hand control devices shall comply with GB/T 19671 of. The minimum degree of protection

5.2.4.4 operator panel and suspended from the bending machine control device is IP54 (see GB 4208).

5.2.4.5 control device housing protection rating of IP54 (see GB 4208).

5.2.4.6 In addition to neutral and protective conductor, the other wire identification shall comply with GB 5226.1-2008 in 13.2.4.

5.2.4.7 stop - motion control device connected to the operation section, inching devices and control systems between should not rely on a relay. Should not be short-circuited Accidental starting.

5.3 Mechanical hazards danger zone

5.3.1 General requirements Bending machine operating hazardous area mainly positive bending machine molds and related areas, such as sports care feeding, movement and tilt gauge work Member should take appropriate protective measures to prevent the risk.

5.3.2 Security guards Designers, manufacturers and suppliers on the basis of a serious risk of considering bending machine and the operating mode selected on the line with GB/T 15706.1 Can risk and GB/T 15706.2 specified to minimize safety device for operator safety protection.

c) interlocking guard with or without guard locking;

d) photoelectric protection device;

e) stop - motion control device with low closure (not more than 10mm/s) used in combination;

f) scanning system.

5.3.3 security measures in combination The selected combination of security measures should be able to protect all persons exposed to hazardous areas, such as the ongoing operation, commissioning, maintenance, maintenance Repair, all persons may enter the danger zone when cleaning and inspection activities.

5.3.4 enter the danger zone from the front (front)

5.3.4.1 Manual on materials and/or manual material bending machine, it should not use its Security closed-end fixed mold and protective equipment Home, should be equipped with one or more safety systems, such as interlocking guard with or without guard locking, optoelectronic protective devices (including laser protection Means), stop - motion control devices, scanning systems, reliable safety device, in the case of security system is not connected, the bending machine should not exceed Over 10mm/s speed.

5.3.4.2 and automatic cycle with automatic feeding and unloading bending machine shall be equipped with one or more safety systems, such as with or without protection Lock interlocking guards, optoelectronic protective devices (including laser protection devices), the stop - motion control devices, scanning systems, reliable safety protective equipment Home. Should prevent the entry into or stand in the security zone. Just under

5.3.4.3 Auto Cycle mode and with automatic feeding and unloading bending machine, adjust the mode of work and without human intervention circumstances It can be designed to use only the enclosed mold or fixed guards.

5.3.5 Connection Classification Control systems and safety devices should be connected to at least the requirements of these safety devices belong to the same category.

5.3.6 Closed Die Closed mold should be intrinsically safe, mold opening and related spacing should be consistent with GB 23821 requirements and should avoid any additional Risk of crushing. Any area can cause crushing external closed mold in accordance with the requirements of GB 12265.3-1997 should be Table

5.3.7 Fixed guards Fixed guards shall comply with GB/T 8196's. The safety device is firmly connected to the machine, or other rigid floor member on. Open...

6.4 Human error, human habits produce Danger

6.5 Since the manually operated means unreasonable Design, production and installation location and identification Students dangerous

6.6 Since the display device unreasonable design Or hazardous to the installation position generated Working position, control, adjustment, maintenance and manipulation of any HE area 4.9 5.8.8 5.8.8.2, 7.2.2d) 5.4.5.1, 5.4.5.4, 5.4.3,5.4.6 5.4.5, 5.8.8.2

5.8.8.2 Table 1 (continued) No. Danger area GB/T 15706.1- Section 2007 Protective measures (the present standard Quasi corresponding section)

7.5 The operator of human error

8 power supply failure