GB 28240-2012Shears - Safety requirements (English PDF)

1.4 Winding danger

1.5 introduce or involved in dangerous Blades and related areas.

--- Motion between the blade and the workpiece;

--- Motion between the blade and the fixed blade;

--- Between moving parts and fixed parts;

--- Between the bench and the workpiece;

--- Nip between the device and the table or the workpiece;

--- Security guards 4.2 5.2.4,5.3,5.5

1.6 shock hazard electrical, hydraulic, pneumatic equipment moving parts; Motor and drive mechanism; Sports flywheel, belts, pulleys and other motors Drive member; Mechanical handling means

1.7 high pressure fluid ejection hazard hydraulic system, pneumatic system 5.6

5.8.3 Table 1 (continued) No. Danger Zone GB/T 15706.1- Article 2007 of the relevant chapter Security measures (This standard is relevant clauses)

2 electrical hazards

2.1 people in contact with live parts (direct contact) Electrical Equipment 4.3 5.8.1

2.2 people live and becomes zero under fault conditions Member contact (indirect contact) Electrical Equipment 4.3 5.8.1

3 thermal hazards

5.1 Laser laser-risk area 4.7 5.8.6

6 hazardous materials and substances produced using mechanical or processing

6.1 and hazardous liquids, gases, dust clouds, foam And dust caused by contact or inhalation Danger Shears intended use and used in the manufacture Toxic substances 4.8 5.8.7.1,5.8.7.2

7 dangerous neglect Ergonomic machine design school due

5.2.1 Clutches and brakes

5.2.1.1 does not allow the use of hydraulic or pneumatic means to manipulate the brake, unless there are measures to ensure that under fluid or gas pressure loss in the case of Brake can maintain its function, can disengage the clutch.

5.2.1.2 should be designed to ensure that.

a) for the brake or disengaging the clutch spring should be compact;

b) use multiple spring assemblies;

c) spring specifications, dimensions, requirements should be the same;

d) when the compression spring adjustment, clamping device should be locked to prevent the relaxation of the spring;

e) should be able to prevent the spring from the wound.

5.2.1.3 clutch and brake combination and disengagement should not affect its safety function. NOTE. Usually should clutch - brake combination structure to minimize the possibility of simultaneous binding.

5.2.1.4 brakes and clutches should be designed to ensure that any failure of a component failure can cause other elements, in order to avoid the risk of rapid emergence of Failure. Broken or loose parts should not cause brake or clutch failure.

5.2.1.5 heat generated if they can produce dangerous conditions, cooling measures should be taken.

5.2.1.6 should take effective measures to prevent the lubricant to penetrate except brake friction surface brake design requires otherwise.

5.2.1.7 clutches and brakes in the design, should be destroyed or eroded sealing material (such as seals or gaskets) moisture, dust, or Lubricants can not adversely affect the required functions, such as clogged air line.

5.2.1.8 should not use a belt brake tool holder slider.

5.2.1.9 clutch in the allowable limit conditions of use, to be joined and the suspension travel in the correct position.

5.2.2 General requirements

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

5.2.2.2 should filter regulator.

5.2.2.3 ensure that pressure is maintained within the allowable range.

5.2.2.4 withstand the pressure of a transparent appliance (such as glass, plastic) without affecting visibility conditions should be protected to prevent accidental breakage When spatter injury to personnel.

5.2.2.5 All piping, pipe fittings, channels, tanks and processing holes should remove burrs and debris.

5.2.2.6 piping connections shall be smooth and should take measures to prevent damage due to thermal expansion, rigid conduit should be spaced fastening the support, in order to avoid Free vibration or movement. Special attention should be to avoid entanglement or twisting of the hose.

5.2.2.7 drop in pressure could cause dangerous actions turret unexpected places should not use a hose; pipes and connections should be chosen to prevent Pressure drop; the connection is not allowed to take the pressure mounting, cement ring or other similar connection method.

5.2.2.8 valve should not rely on the connecting pipe be supported.

5.2.2.9 clutch control valve should be designed to ensure that in the non-operative position, there should be no pressure on clutch operating cylinder.

5.2.2.10 clutch and brake control valve should ensure that the inlet and outlet can not be closed.

5.2.2.11 clutch operating cylinder and the valve between the inlet and discharge piping should have sufficient capacity to ensure fluid from clutch operating cylinder fast Discharged. Measures should be taken to ensure the operation of the valve of the discharge opening of a sufficient size to prevent residual pressure in the cylinder.

5.2.2.12 Control valves and other control elements (such as a regulator, etc.) should be installed in easily accessible and easily damaged location.

5.2.2.13 manually when required or by mechanical (ie, non-electrical) the pilot control valve, the end of its stroke to reset the clutch disengaged position It should be compulsory. NOTE. The valve safety position may be open or closed position, depending on the principle of hydraulic or pneumatic circuit.

5.2.3 pneumatic system Valves and other parts requiring lubrication

5.2.4 Hydraulic System

5.2.4.1 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 It was 10% higher than the system maximum working pressure.

5.2.4.2 When the pressure generated when the mechanism stops working on the hydraulic system with accumulator, fluid pressure should be released, otherwise in pressure Loop portion due under the manual drain valves and other equipment related to compliance with the provisions of the accumulator required (such as unloading valves, pressure gauges, etc.), and should There are clear warning signs posted.

5.2.4.3 In order to avoid accidental pressure surge damage caused by the lower chamber of the cylinder, the fuel tank should be set for the security of the lower chamber (unloading) valve. Set pressure valve should be at least 10% higher than the system maximum working pressure.

5.2.5 Electrical System

5.2.5.1 Electrical equipment of machines shall comply with the provisions of GB 5226.1, power, physical environment and operating conditions differ from GB 5226.1- 2008 specified in

4.4 should be resolved through consultation.

5.2.5.2 should stop category 0 emergency stop function (see GB 5226.1-2008 in 9.2.5.4). Emergency stop all dangerous movement (Turret, back gauge, care feeding and other devices).

5.2.5.3 The operator control panel is at least a minimum degree of protection IP54 (see GB 4208).

5.2.5.4 electric control box housing protection rating of at least IP54 (see GB 4208).

5.2.5.5 outside the control cabinet wiring shall ensure that a short circuit does not cause unintended operation, shall comply with GB/T 19670 of.

5.2.6 maintenance or repair during the turret to prevent accidental gravity fall

5.2.6.1 When there is risk of injury gravity fall should provide mechanical holding means (such as a stopper rod), when it is put into repairing Shears Machine, or when replacing the tool to ensure that necessary break.

5.2.6.2 When the mechanical retaining means can not completely absorb the entire shearing force, which should shears interlock control system to ensure the turret Held on the dead can not be down, shall comply with GB/T 19670 of.

5.3 Mechanical hazards danger zone

5.3.1 General requirements Shears blade operation and its associated danger zone is the area should take security measures to prevent danger, when the gap is no more than 6mm When you do not need security. Select

5.3.2 Safety Measures Designers, manufacturers and suppliers shall select a fixed guard to protect persons exposed to the danger zone. Not as fixed guards Feasible, should be selected according to the following safety precautions and operation of major hazard.

a) interlocking guard;

b) photoelectric protection device.

5.3.3 shears from the front into the danger zone

5.3.3.1 General requirements The selected protective device combination should protect all persons exposed to the danger zone, such as in the operation, commissioning, maintenance, cleaning and inspection process Personnel entering the danger zone. Guards and protective devices should be chosen with the shears control system having at least the same security category, and its compatibility. Shears front bench should extend beyond the protected area. A feed and opening it to the danger zone (pressing device/shear line) distance B (see Figure 1) shall comply with the requirements of Table 2. To the feed opening Port A > shears 38mm, the guards should use interlocking guard or protector. Explanation. 1

--- squeeze danger; 2

--- cut danger; 3

--- motion blade; 4

--- binder foot; 5

--- fixed guards. A

--- feed opening; B

--- minimum safety distance. Figure 1 feed opening shears stationary anti-loaded device to the minimum safety distance Table

2 Feed opening A and B the minimum safety distance in millimeters Fee...

7.4 Local lighting inappropriate

7.6 various human error

7.7 Manually operated device design, substandard location Reason, it is difficult to identify

7.8 display device design, unreasonable position 4.9 5.8.8,7.2.2 5.4.3,5.4.5,5.4.6 5.4.3,5.4.4,5.4.5, 5.8.8 5.8.8 8 unexpected start, unexpectedly overtravel, speeding

8.1 control system failure or disorder

8.3 Outside interference of electrical equipment

8.4 Other effects (gravity) Blades and related areas.

--- Motion between the blade and the workpiece;

--- Motion between the blade and the fixed blade;

--- Between the bench and the workpiece;

--- Nip between the device and the table or the workpiece;

--- Clamping device or positioning device and the workpiece between;

--- Motorized backgauge place;

--- Movement of the work place;

--- Flying shears and drop the rear part;

--- Back plate material holding means;

--- Rear plate conveyors;

--- Sheet stacking device 5.2.1,5.2.2,5.4.1 5.4,7.2.2

5.4 Table 1 (continued) No. Danger Zone GB/T 15706.1- Article 2007 of the relevant chapter Security measures (This standard is relevant clauses) 8.5 4.9

5.4.2 Software Error Human operator to operator error 8.6 4.9 7.2.2 13 energy supply failure 5.2.1.12 14