Hydraulic explosion-proof hoist and hoist winch safety requirements

1 Scope

The safety requirements and/or measures specified in this standard are for all hazards of hydraulic explosion-proof hoists and hoist winches. They apply to the hazards generated during the various stages of the machine life as specified in 3.11 of GB/T 15706.1-1995. .

This standard imposes restrictions on hydraulic explosion-proof hoists and hoist winches in terms of physical properties and intended use.

This standard applies to hydraulic explosion-proof hoist and hoist winch.

2 Reference standards

The provisions contained in the following standards are incorporated into this standard and constitute the provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised and all parties using this standard should explore the possibility of using the latest version of the following standards.

GB 191-1990 Packaging, Storage and Transportation Icon Marking

GB/T 3766-1983 General technical conditions of hydraulic system

GB/T 3768-1996 Acoustic sound pressure method for the determination of noise source sound power level

GB 3836.1-3836.8-1983 explosion-proof electrical equipment for explosive atmospheres

GB/T 6004-1985 Test screen with wire braided square hole mesh

GB/T 7935-1987 General technical conditions for hydraulic components

GB/T 11345-1989 Manual ultrasonic inspection method for welds of steel and classification of flaw detection results

GB/T 13306-1991 Signs

GB/T 15706.1-1995 General principles and design principles of mechanical safety - Part 1: Basic terms, methodology

GB/T 15706.2-1995 General principles and design principles of mechanical safety - Part 2: Technical principles and specifications

JB/T 1581-1996 Ultrasonic flaw detection method for steam turbine, turbine generator rotor and spindle forgings

JB 8519—1997 Mine Hoist and Mining Hoist Disc Brakes

Coal Mine Safety Regulations (1992 edition)

3 Danger List

The hazards that may occur during the intended service life of hydraulic explosion-proof hoists and hoist winches are shown in Table 1.

 
4 Safety requirements and/or measures

4.1 The mechanical safety shall comply with the provisions of GB/T 15706.1 and GB/T 15706.2.

4.2 The explosion-proof requirements shall comply with the provisions of GB 3836.1-3836.8.

4.3 The safety factor of wire ropes shall comply with the provisions of Article 376 of the "Coal Mine Safety Regulations".

4.4 The speed, acceleration and deceleration of lifting shall comply with the provisions of Articles 400, 401 and 402 of the Coal Mine Safety Regulations.

4.5 When the lifting container exceeds the normal terminal stop position 0.5 m, it should be able to automatically power off, safe braking, and achieve over-roll protection.

4.6 When the lifting speed exceeds 15% of the maximum speed, it shall be capable of automatic power-off, safe braking, and overspeed protection.

4.7 The speed limit protection shall comply with the requirements of paragraph 4 of Article 403 of the Coal Mine Safety Regulations.

4.8 The depth indicator should accurately indicate the location of the container and send a signal for deceleration, stoppage and overwinding.

4.9 The electrical system should have overload and undervoltage protection.

4.10 Disc brakes shall comply with the requirements of JB 8519.

4.11 The disc brake safety brake idle travel time should not exceed 0.3s.

4.12 Disc brakes shall be provided with brake shoe over-wear and spring fatigue protection devices.

4.13 When working brake or safe braking, the ratio of the generated braking torque to the maximum load static rotating torque shall comply with the provisions of Article 409 of the "Coal Mine Safety Regulations".

4.14 When braking safely, the braking deceleration shall comply with Article 410 of the Coal Mine Safety Regulations.

4.15 The main weld of the hoist drum shall meet the requirements of Class II welds in GB/T 11345, and shall be dealt with to eliminate internal stress.

4.16 The main shaft should meet the strength and stiffness requirements. The internal inspection of the flaws should not have white spots and cracks, and should not have defects such as loosening, slag inclusions, and shrinkage holes that affect the performance.

4.17 There should be no medium with friction coefficient on the brake disc, such as water and oil.

4.18 The full bouncing moment t of the end face of the brake disc shall meet: t≤0.4mm when the reel diameter is less than 2m, and t≤0.5mm when the reel diameter is greater than or equal to 2m.

4.19 The friction surface roughness Ra of brake disc should not exceed 3.2μm.

4.20 The hydraulic system safety requirements shall comply with the relevant provisions of GB/T 3766.

4.21 hydraulic components shall comply with the provisions of GB/T 7935.

4.22 When the hydraulic main system pressure exceeds 25% of the rated pressure, it should be able to automatically power off, safely brake, and achieve overpressure protection.

4.23 The cleanliness of the hydraulic system shall be filtered with a SSW 0.063/0.045 filter. The impurities shall not exceed the following requirements; 400mg of the hoist shall be used to lift the winch to 250mg.

4.24 When the product is continuously operated under rated load, the oil temperature should be 20 to 70°C. No oil leakage in the hydraulic system.

4.25 The hydraulic control system shall be safe and reliable, with stepless speed regulation, stable start-up reversing, complete monitoring, and a zero interlock protection device for the joystick.

4.26 Exposed rotary parts should be provided with protective devices.

4.27 The sound pressure level at the position of the driver's console shall not exceed 88 dB(A).

4.28 Working brakes and safety brakes shall be operated independently. The emergency brake switch should be set on the control console.

5 Determination of safety requirements and/or measures

5.1 Speed, Acceleration, and Deceleration The lifting smart tester or photoelectric oscilloscope or digital speed meter is used for the determination (the former method is used as arbitration).

5.2 Explosion-proof performance shall be measured according to the methods specified in GB 3836.1-3836.8.

5.3 The performance of disc brakes shall be measured in accordance with the test method specified in JB 8519.

5.4 Disc brakes The determination of the free travel time of the safety brake shall be applied to the smart tester of the hoist or to the metal foil on the brake disc and brake shoe, measured by an electric stopwatch (the former method is used as arbitration).

5.5 The determination of braking torque shall be carried out by using a hoist intelligent tester or a tension meter with an accuracy of not less than 2 (the former method is used as arbitration).

5.6 The main weld of the hoist drum should be measured according to the method specified in GB/T 11345.

5.7 Ultrasonic flaw detection of internal spindle defects shall be carried out according to the method specified in JB/T 1581.

5.8 Hydraulic system safety requirements shall be measured in accordance with the relevant provisions of GB/T 3766.

5.9 The performance of hydraulic components shall be measured according to the method specified in GB/T 7935.

5.10 Determination of the degree of cleanliness of the hydraulic system Application of the screens specified in GB/T 6004 shall be carried out by the dry weighing method.

5.11 Determination of noise at the driver's console should be carried out in accordance with the method specified in GB/T 3768.

5.12 The determination of various safety protections shall be field tested.

6 Use information

6.1 Each product should be fixed on the control table product label, the type and size of the sign should be consistent with the provisions of GB/T 13306's. Its main information content is as follows:

a) the name of the manufacturer;

b) product model and name;

c) The main technical parameters of the product;

d) Year, month and factory serial number of the product.

6.2 The packaging, storage and transportation icons of products shall be in accordance with the provisions of GB 191.

6.3 The product should be provided with the following information:

a) Product installation, commissioning, use and maintenance instructions;

b) Product installation drawings, basic drawings, hydraulic schematics, electrical schematics and piping layouts, etc.;

c) product packing list;

d) Product factory certification and so on.

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