GB 21009-2007Mine blast-hole drills - Safety requirements (English PDF)

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Notes and Explanations

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5.2 Safety requirements for operating positions

5.2.1 The operation of the drill shall be carried out in a state where the surrounding environment is not dangerous to personnel. The position and standing space required by the operator shall meet the requirements of GB/T 8420 and JB/T 3683.

5.2.2 For drill used for underground or tunnel operations, protective measures shall be taken as needed to prevent the danger caused by splashing objects.

5.2.3 The driving and operating positions of the drill shall have good visibility to ensure that there is no danger to personnel.

5.2.4 The drill can be equipped with an operator's cab as needed. The operator's cab shall meet the following requirements:

a) The operator's cab shall be equipped with air conditioning or safe heating and cooling devices according to the working conditions to ensure that the temperature in the operator's cab is within the range of 15°C31°C;

b) An air purification device shall be equipped; and the dust concentration in the air in the operator's cab shall meet the requirements of

5.13.1 in this Standard;

c) When the drill is operating with the doors and windows closed and the air conditioning and purification devices turned on, the noise in the operator's cab shall not exceed 85dB (A), and the noise shall be tested in accordance with the provisions of GB/T 13325;

d) Necessary vibration reduction measures shall be taken, and the weighted root mean square acceleration correction value at the seat cushion shall not exceed 1.25m/s2. The vibration test shall be carried out in accordance with the method of GB/T 8419;

e) The direction of the door opening shall enable the operator to quickly leave the operator's cab in case of danger;

f) The decorative materials in the operator's cab shall meet the fire protection requirements of

5.12.1 in this Standard;

g) The illumination in the operator's cab shall meet the requirements of

5.11.3 in this Standard;

5.3 Control system

5.3.1 The safety part of the drill control system shall meet the requirements of GB/T 16855.1.

5.3.2 The main transmission system of the drill shall be manually started through the starting device. If the drill has multiple devices for starting, these devices shall be linked to each other so that one of them can be used to complete the start. For pneumatically driven drill, a shut-off valve shall be set on the main circuit to connect or disconnect the power unit and the main machine, and to release the system pressure.

5.3.3 The drill shall have a normal shutdown command device to enable it to stop safely during operation. The drill shall be equipped with a total stop switch; and each operating position for operation and driving shall have an emergency stop device to prevent dangers caused by emergencies.

5.3.4 The interruption of power supply or the re-supply after interruption shall not lead to the occurrence of danger and shall meet the following requirements:

a) The drill can only be restarted by human command;

b) If the shutdown command has been issued, the drill must be shut down;

c) Equipment parts or tools are not allowed to fall or pop out;

d) Protective devices and protective measures shall be ensured effective. Power supply failure or hydraulic and pneumatic pressure deviation from the set value is not allowed to cause dangerous actions and emergency shutdown system failure.

5.3.5 Failure of the control circuit or logical failure of the control circuit is not allowed to cause danger.

5.4 Control device

5.4.1 The operation of the control device shall be safe, flexible and comfortable; and its design configuration and marking shall meet the requirements of

GB/T 15706.2. The main control device shall be arranged in the comfortable area of operation, and the auxiliary control device can be arranged in the reach of operation or other positions outside the danger zone. If the drill has multiple operating positions, a selection switch shall be configured so that the operator can purposefully select a favorable operating position.

5.4.2 The drill shall have corresponding emergency stop and safety devices; and the emergency

5.6.5 When the drill is operating, traveling and stopping on a slope exceeding the maximum allowable slope, a traction winch shall be equipped to prevent the drill from slipping on the slope.

5.7 Protection of moving parts

5.7.1 The design, manufacture and installation of the moving parts of the drill shall avoid the dangers described in

GB/T 15706.1; and shall minimize the number of manual operations in the danger zone.

5.7.2 For rotating transmission parts within the reach of personnel, such as drive shafts, couplings and V-belts, protective devices shall be provided. Transmission parts that are not frequently approached shall be equipped with fixed protective devices. The protective devices shall be placed in their positions by spot welding or fixed installation so that they can only be opened or removed with auxiliary tools such as wrenches. When frequent repairs or maintenance are required, movable protective devices shall be installed. Movable protective devices shall meet the following requirements:

--- When they are opened, they shall be fixed to the machine as much as possible;

--- Where they are opened, a supporting mechanism shall be equipped. Protective devices shall meet the requirements of GB/T 15706.2 and GB/T 8196.

5.7.3 If the operator works in a danger zone close to moving parts, special attention shall be paid to the dangers of connecting and disconnecting drill pipes, breaking of the connecting threads of the drill bit group, and installation, disassembly and replacement of drill bits.

5.7.4 If the weight of a single drill pipe exceeds 25 kg, the drill shall have a mechanical connection and disconnection mechanism for the drill pipe or an auxiliary hoist.

5.7.5 The pressure mechanism of the drill with a push slide (except for those driven by oil or air cylinder) must be equipped with upper and lower limit limiting devices.

5.7.6 When the drill operates in the danger zone between the carrying equipment and the working surface of the tunnel, a warning sign shall be set in front of the drill.

5.7.7 If an assistant is required to work in the danger zone during the operation of the drill, it can only be carried out when the requirements of

6.4.5 of this Standard are complied with.

5.8 Electrical equipment

5.8.1 The electrical equipment of the drill shall have a set of grounding protection devices. The electrical equipment shall meet the relevant requirements of

GB 5226.1; the drill used for underground explosion-proof requirements shall have explosion-proof functions, and its electrical equipment shall meet the requirements of GB 3836.1 ~ 3836.9.

5.8.2 For drill with their own transformers, protective railings shall be set around the transformer or the transformer shall be placed in an isolation room; and corresponding safety signs should be set; the safety signs shall meet the requirements of

GB 2894. Drill with their own transformers shall be equipped with cable reels as much as possible. Drill without cable reels shall be equipped with high-voltage cable introduction devices to prevent the joints from falling off. Reliable protection measures shall be taken for manually dragging cables.

5.8.3 The battery shall be firmly installed in the designated position; and the electrolyte shall not be allowed to splash onto people or surrounding equipment. The electrodes shall have protective shields; and the circuit shall be equipped with insulating switches. Protective shields shall be installed around the battery to prevent the operator from being burned by electrolyte or steam when the drill overturns.

5.8.4 The ladder for climbing onto the drill from the ground shall be laid with insulating materials such as rubber or plastic to prevent injury to personnel due to leakage.

5.9 Hydraulic system The hydraulic system shall comply with the relevant safety provisions in GB/T 15706.2 and

GB/T 3766. The system pressure shall not exceed the maximum allowable pressure of the pipeline, and the pressure drop and liquid leakage shall not cause danger. The system shall be equipped with temperature and pressure monitoring devices to sound an alarm when the temperature or pressure exceeds the permitted range. The hydraulic oil should be non-toxic. Hydraulic hoses shall be prefabricated. Hydraulic hoses shall be isolated from electrical wires and away from hot surfaces and sharp edges. Moving hydraulic hoses shall be equipped with guide devices. Hydraulic oil tanks shall have level indicators; and the full oil tank shall not overflow when the drill is operating and traveling on an inclined surface.

5.10 Pneumatic device Pneumatic devices shall meet the relevant safety requirements in GB/T 15706.2 and

GB/T 7932. The system pressure shall not exceed the maximum allowable pressure of the pipeline, and the pressure drop and gas leakage shall not cause danger. The pneumatic system shall be equipped with a pressure monitoring device to sound an alarm when the pressure exceeds the permitted range. Pneumatic hoses shall have necessary guide devices, and measures shall be taken to prevent the

--- Moving wire rope under exceptional operating case is 2.0;

--- Wire rope for installation, traction and hanging is 2.5;

--- Wire rope for impact drilling is 5.0 (ratio of minimum breaking load of wire rope to weight of drill bit group);

--- Wire rope for feed is 3.0. Diameter:

5.16 Drilling rig, drill pipe and working platform

5.16.1 The lifting and lowering mechanism of the drilling rig and the drill pipe shall be equipped with a safety device, which can automatically prevent the drilling rig and the drill pipe from falling down in the event of an accidental failure of the lifting and lowering mechanism. The lifting and lowering of the drilling rig and the main working state of the drill shall be within the operator's field of vision.

5.16.2 There shall be appropriate stairs or steps at the entrance of the working platform, and there shall be guardrails around it. The high drilling rig shall be equipped with a ladder, and there shall be guardrails around the ladder and on the top of the drilling rig.

5.16.3 The working platform of the drill and the passageway accessing to the working platform shall comply with the provisions of

GB 17888.2; and the equipped stairs, steps and guardrails shall comply with the provisions of GB 17888.3.

5.17 Special requirements for remote control (including remote) drill

5.17.1 The drill shall be equipped with an additional controller to operate the drill. The start and stop of the drill are only allowed to be controlled by the operating device on the drill or at an operating position. This operating position shall be able to clearly monitor the working area. If this operating position cannot directly monitor the working area, it can be monitored by a monitoring system such as a TV screen. The drill shall be equipped with a visual or audible warning device, which automatically intervenes in the work before the drill is started and displays the working status of the drill working in the remote-control state.

5.17.2 The remote-control position of the drill shall be equipped with an emergency stop device, and the auxiliary emergency stop device shall be installed on the drill and can be safely and conveniently reached from outside the drill.

5.17.3 The design of the control system shall meet the following requirements:

--- If the contact between the operator and the drill is interrupted or the initial command sequence is completed, the control circuit shall be able to automatically stop the drill;

--- The control system of the unmanned automatic control drill shall be equipped with a complete diagnostic system, which shall be able to stop the drill if an error state or abnormal operation is found;

--- After an error occurs in a part of the system, restarting through automatic functions is not allowed. The operator is only allowed to start the recovery operation through manual startup;

--- The drill shall be equipped with a selection switch to switch between on-site control and remote control. On-site control shall take precedence over remote control.

5.17.4 Remote control drill for underground operations shall be equipped with an automatically activated onboard fire extinguishing device that can extinguish fires in diesel engines and electrical systems. The fire extinguishing system shall be able to be triggered from the control panel or monitoring position.

5.18 Warning device The warning device that sends out signals shall be able to send out warning signals conveniently

--- Explanation of use markings;

--- General drawing of components and the whole machine;

--- Required symbols, schematic diagrams, and example illustrations, which shall be of sufficient size to clearly indicate the model, function, location of the main components and their relationship with the entire drill;

--- Load/speed diagram of winch and lifting mechanism;

--- Maximum ground pressure ratio under certain working conditions;