GB 12367-1990 Safety regulations for painting operations Safety of electrostatic spray painting process
Some standard content:
National Standard of the People's Republic of China
Safety Code for Painting Operations
Safety for Electrostatic Spray Painting Process
Safety code for painting-
Safety for electrostatic spray painting process1Subject content and scope of application
GB12367--90
This standard specifies the safety requirements for electrostatic spray painting process and its equipment, paint storage and transportation, operation and maintenance. This standard applies to the design, manufacture and use of electrostatic spray painting process and its equipment using flammable or combustible paint and water-based paint. 2 Reference standards
Safety colors
GB 2893
GB 2894
Safety signs
Safety regulations for painting operationsPainting process safetyGB6514
GB6515
Safety regulations for painting operationsPainting process ventilation and purificationGB7691Safety regulations for painting operationsLabor safety and labor health managementGBJ4Trial standard for industrial "three wastes" dischargeTJ36 Hygiene standards for industrial enterprise design
3 Terms
3.1 Electrostatic spray paintingelectrastatic spray painting is a painting method that uses the principle of corona discharge to make the atomized solvent-based and water-based paints negatively charged under the action of a high-voltage DC electric field and adsorbed on the surface of a positively charged substrate for discharge.
Working area for electrostatic spray painting3.2
The painting area of electrostatic spray painting is the electrostatic spray painting area. 3.3 Electrostatic atomizer Electrostatic atomizing head is a pneumatic, electric or other form of atomizing device that can fully atomize the paint and charge it with static electricity, and has high-voltage electrostatic protection measures. Such as: spray gun, spray plate, etc.
3. 4 Electrostatic spray painting booth is a completely closed or semi-closed room or enclosure structure with good mechanical ventilation devices, which is specially used for electrostatic spray painting. The indoor air flow organization can prevent the paint mist and solvent vapor from escaping to the outside, so that it can be concentrated and safely discharged to the outside. 4 Electrostatic spray painting area
4.1 Scope
The electrostatic spray painting area should generally include the following scope: 8. The interior of the electrostatic spray painting room and the exhaust duct, and other places where the paint can be directly sprayed; the enclosed internal space on the electrostatic spray painting line approved by the State Bureau of Technical Supervision on June 18, 1990 260
1991-04-01 implementation
GB 12367-90
; b.
Other working areas where the electrostatic spray painting process is located as determined by the relevant departments. 4.2 Lighting
The electrostatic spray painting area should be illuminated by explosion-proof lamps or partitions. When general lighting is used in the electrostatic spray paint room, the illumination should not be lower than the values listed in Table 1:
Table 1 Minimum illumination values when general lighting is used in the electrostatic spray paint room Paint film requirements
More precise
Automobile topcoat, paint film inspection, etc.
Ordinary decals, vehicle painting, etc.
Primer spray, etc.
When lighting is achieved through partitions made of transparent materials such as glass, the following requirements shall be met:a.
Fixed lamps are used as light sources;
Illumination, lx
Use partitions to separate the area where lamps are installed from the electrostatic spray paint area, and reliable sealing measures shall be taken for the installation gaps; the material of the partitions shall be flame retardant and not easily damaged; c.
The thickness of the deposits on the partitions shall not affect the specified illumination. d.
4.3 Mobile live equipment
4.3.1 Electrical equipment not related to painting shall not be installed in the electrostatic painting area. When performing electrostatic painting operations, it is strictly prohibited to use portable lamps and other mobile electrical equipment in the electrostatic painting area. 4.3.2 The electrical equipment used for cleaning or maintenance must comply with the national regulations on electrical equipment in explosion-hazardous areas to achieve overall electrical explosion protection.
4.4 Electrostatic painting equipment
Electrostatic painting equipment can only be installed and used in the electrostatic painting area if it meets the requirements of Chapter 6 and Chapter 7. 4.5 Fire prevention
4.5.1 The fire prevention requirements for the electrostatic painting area shall be implemented in accordance with the provisions of Chapter 5 and Chapter 11 of GB6514. 4.5.2 The electrostatic painting room shall be equipped with an automatic or semi-automatic fire alarm device, which shall be interlocked with the automatic stop feeding, power cut-off device, automatic fire extinguishing device, etc.
4.5.3 Automatic fire-proof regulating valves shall be installed in the ventilation ducts associated with the electrostatic spray painting room. 4.5.4 Sufficient number of fire extinguishers shall be set up in the electrostatic spray painting area. 4.6 Electrostatic grounding
All conductive metal parts that need to be grounded in the electrostatic spray painting area shall be reliably grounded. The grounding resistance value of each set of dedicated electrostatic grounding bodies shall be less than 100S2; the total leakage resistance value of the charged area of the charged body to the earth shall be less than 1×106Q. 4.7 Safety signs
Safety signs that meet the requirements of GB2893 and GB2894 shall be installed in conspicuous positions in the electrostatic spray painting area. 4.8 Other requirements
Other requirements for the electrostatic spray painting area shall comply with the requirements of Chapter 2 of GB6514 for the painting operation site. 5 Ventilation and purification
5.1 Mechanical ventilation devices must be installed in the electrostatic spray painting room. The ventilation and purification of the electrostatic spray painting room shall comply with the requirements of GB6515. 5.2 During electrostatic painting, the mechanical ventilation device should be kept in working state at all times, and the painting equipment should be started only after the ventilation device is started. After the painting work stops, the ventilation device should continue to run for 5~10 minutes. 5.3 When using automatic electrostatic painting equipment, the operation control of the equipment must be interlocked with the ventilation device. 261
GB 12367—90
5.4 The leveling or drying area of the workpiece after painting should be well ventilated. 5.5 During the electrostatic painting process, in order to capture the wastewater generated by the paint mist, purification measures should be taken to make it meet the requirements of GBJ4. 5.6 The waste residue generated when cleaning the electrostatic spray room and the paint spray equipment should be properly handled. 6 Fixed electrostatic painting equipment
6.1 Equipment allowed to be used
The electrostatic atomizer is an electrostatic painting equipment fixed by mechanical clamping. The equipment and the anti-static equipment should meet the requirements of Chapter 4 of GB7691 and should have a factory acceptance certificate. 6.2 Electrical and control equipment
Except for high-voltage grids, electrodes, electrostatic atomizers and connecting cables, transformers, high-voltage power supplies, control devices and other electrical components (such as plugs, etc.) shall be installed outside the electrostatic spraying area and shall comply with the requirements of Chapter 5 of GB6514. 6.3 High-voltage electrostatic generators
The requirements for high-voltage electrostatic generators shall comply with the provisions of Article 11.1 of GB6514. 6.4 Electrodes and electrostatic atomizers
6.4.1 Electrodes and electrostatic atomizers shall be firmly installed on the base, bracket or reciprocating device and shall have reliable insulation to the ground, and their resistance to the ground shall be greater than 1×10102.
6.4.2 When the fixing element is a thin metal wire, the metal wire shall be taut at all times, and knotted, twisted or hardened metal wires shall not be used. 6.5 High-voltage cables
6.5.1 High-voltage cables shall be effectively insulated and protected to prevent mechanical damage or exposure to corrosive media. 6.5.2 Exposed high-voltage cable joints or components shall be reliably fixed on insulators suitable for the voltage, and shall not be accidentally contacted or grounded with other objects.
6.5.3 High-voltage cables shall comply with the requirements of Article 11.3.3 of GB6514. 6.6 Safety distance
The safety distance that must be maintained between the workpiece being painted and the electrode, electrostatic atomizer and other conductors shall be at least twice the maximum distance of spark discharge under the voltage.
6.7 Support and suspension of workpieces
The workpiece being painted shall be supported on the conveying device or hung on the sling and reliably grounded, and the grounding resistance shall be less than or equal to 1×10°2. The contact area between the workpiece and the sling shall be made into a spike shape or a blade shape as much as possible. The grounding resistance value shall be regularly tested during production and the paint accumulation on the sling shall be regularly cleaned. The support or suspension point of the workpiece should be set in a position that is not sprayed or not easy to accumulate paint. 6.8 Automatic control device
Under the following circumstances, the electrostatic spraying equipment should be equipped with an automatic control device that can quickly cut off the high-voltage power supply and close the paint supply system: mechanical ventilation device failure;
electrostatic spraying equipment failure and shutdown;
spark discharge occurs at any position in the high-voltage system; c.
d. main power supply is cut off;
e. safety distance is less than the value specified in Article 6.6. 6.9 Grounding
Except for the ungrounded devices specially set in the high-voltage electric field due to process requirements, all conductive objects within the range of the electrode's electrification influence shall be reliably grounded. This requirement also applies to paint containers, metal containers for washing, safety fences and other conductive objects or equipment in the electrostatic spraying area. A striking grounding mark shall be installed on the equipment. 6.10 Isolation
There shall be separate or combined safety protection facilities around the electrostatic spraying equipment, such as isolation chambers, fences and fences. 6.11 Insulators
All insulators shall be kept clean and dry. 7 Manual electrostatic spraying equipment
7.1 Permitted equipment
GB12367-90
The electrostatic atomizer is a handheld or hand-controlled electrostatic spraying equipment. The equipment and the anti-static equipment shall comply with the requirements of Article 6.1. 7.2 High-voltage circuit
The high-voltage circuit shall be designed to be safe. The exposed electrostatically charged parts of the spray gun shall be energized only by the operating switch, which shall also be interlocked with the supply of paint for spraying.
7.3 Electrical and control equipment
Except for the spray gun and its connection to the power supply, the requirements for the remaining electrical and control equipment shall comply with the requirements of Article 6.2. 7.4 Grounding
The handle of the spray gun shall be grounded by a metal wire. The operator shall hold the grounding handle tightly when in the normal working position. Personnel who are not wearing conductive shoes shall not enter the area where the paint is being sprayed, and it is strictly forbidden to contact the operator who is working. Other requirements for grounding shall comply with the requirements of Article 6.9.
7.5 Other requirements
Other requirements for manual electrostatic spray painting equipment shall comply with the requirements of Articles 6.3, 6.5, 6.6, 6.7, 6.8 and 6.11. 8 Paint storage and transportation
8.1 Storage capacity
A certain amount of paint is allowed to be stored in the electrostatic spraying area, but it shall not exceed the amount used by one work shift. 8.2 Container
The container for feeding the electrostatic atomizer shall be made of metal materials and shall ensure no leakage or overflow. The volume of the gravity feed container shall not exceed the storage capacity of the paint required by one work shift. 8.3 Anti-static
When pouring flammable or combustible paint from one metal container into another, the two metal containers shall be effectively connected and grounded. When conveying paint through pipelines, in addition to grounding and bridging the pipelines, the paint flow rate shall also be controlled, and the flow rate should not be greater than 1m/s. 8.4 Pressure tank feed container
If it is a pressure vessel, its design, manufacture, use, and management shall comply with relevant national laws and regulations and standards. 8.5 Water-based paint
If low-resistance paint such as water-based paint is used for electrostatic spray painting, the paint container should be placed on an insulating support and used as an insulated ungrounded state, and the paint delivery pipeline should also be insulated. 9 Operation and maintenance
When operating and maintaining in the electrostatic spray painting area, the company's electrostatic spray painting process safety operation and maintenance procedures should be formulated in accordance with the provisions of Chapters 8, 9, and 10 of GB7691 and this regulation. 9.1 Necessary protective conditions for operators
a. The operator should wear conductive shoes and remove dirt from the soles of the shoes in time; b. When manually spraying electrostatic paint, the gloves must have holes or be worn without gloves so that the hands can directly contact the gold kitchen of the spray gun handle to ensure that the operator is grounded;
The operator should wear anti-static work clothes. Do not wear underwear made of materials such as silk and synthetic fibers that are easy to generate and accumulate static charges c.
The operator shall not wear isolated metal objects. d.
9.2 Shutdown operation when painting is completed
GB 12367-90
When stopping painting, the high voltage power supply should be turned off first, and then the paint supply switch, paint pump and other switches should be turned off in sequence. After the paint mist is eliminated, the electrostatic spray equipment should be discharged with a discharge rod. The order is paint supply pipeline, electrostatic atomizer and other spraying devices. 9.3 Cleaning of electrostatic spraying area
a. The floor of the electrostatic spraying room should be conductive. For easy cleaning, it is advisable to use conductive coverings; b. The electrostatic spraying area should be kept clean. The paint accumulation inside and outside the electrostatic spraying room and pipelines should be removed in time. 9.4 Flash point of cleaning solvent
The flash point of the solvent used to clean the electrostatic atomizer shall not be lower than 23℃, and shall exceed the ambient temperature of the working area; the flash point of the solvent used to clean the spraying system shall not be lower than 37.8℃.
9.5 Precautions for cleaning operation
a. The cleaning solvent must be stored in a metal container, and the container must be reliably grounded; b. When cleaning the electrostatic atomizer, it is strictly forbidden to use high voltage electricity; cleaning must be done in an area with good mechanical ventilation; c.
The amount of cleaning solvent used each time should be strictly limited, and the filling volume of the container containing the cleaning solvent should not exceed d.
80% of the volume of the container.
9.6 Waste treatment
Cotton yarn, rags and other objects stained with paint or solvents must not be thrown around, but should be placed in a metal box (barrel) with a lid, and removed and properly handled during the shift.
9.7 Replenishment of paint
9.7.1 Before replenishing paint to a paint container placed on an insulating support, it is necessary to: a. Turn off the high-voltage electrostatic generator;
b. Discharge with a discharge rod;
c. Ground the paint container.
Only after meeting the above requirements can the paint in the grounded container be replenished into the grounded paint container. 9.7.2 When the paint container is in the grounding state, the paint container should be reliably grounded before adding paint. 9.8 Maintenance
Maintenance operations should comply with the following provisions:
Before maintenance, the electrostatic spray painting operation should be stopped, the mechanical ventilation device should continue to operate, the indoor flammable gas should be exhausted, and the flammable materials should be evacuated a.
The site;
b. When the maintenance operation involves open flames, it must be reviewed and approved by the enterprise's safety and technology department, the fire safety system must be implemented, and the safe operating procedures must be followed;
The electrostatic measuring instruments used in production and maintenance can refer to Appendix A (reference). c
10 Training and Assessment
10.1 Training
All electrostatic spray painting operators should receive technical training in safe operation, maintenance, personal protection, accident handling, fire prevention and fire extinguishing, paint storage and management and use. 10.2 Assessment
All trainees must pass the assessment before they can take up their posts. 10.3 Other requirements
Other requirements for operators shall comply with the provisions of Article 9.2 of GB7691. 26-1
Name of instrument
QV type electrostatic
voltmeter
electrostatic voltage
electrostatic voltage
collector type electrostatic
voltmeter
ZC type grounding
high insulation
micro current
resistance measurement
ZC Type vibration
capacitive
high resistance meter, etc.
reflection
galvanometer, etc.
universal bridge
Faraday
(or Faraday
operation principle
GB12367-90
Appendix A
common electrostatic measuring instruments
(reference)
measuring range
tens of volts to tens of volts
using electrostatic force
ten thousand volts (but the same-
deflect the wire
using electrostatic induction, after
direct current amplification indication
using electrostatic induction, First, it is transformed into an AC signal through a rotating mechanism, and then amplified to indicate the reading. Radioactive elements are used to ionize the air and change the insulation resistance of the air. Vibrating capacitors are used to transform the weak DC signal into an AC signal, and then amplified and indicate the reading. The magnetic field is used to measure the current. The accuracy of the instrument is small (tens of volts to tens of volts to tens of volts to tens of volts to tens of volts to tens of volts to 0~10/100/1051017 2 The torque of the coil K1.5 ×10-9 A
make the wire deflect
bridge principle
measure the
capacitance and potential of the Faraday circuit, and thenwww.bzxz.net
calculate the charge
several picofarads to
tens of vilarads
applicable places
laboratory,
laboratory,
laboratory,
laboratory,
laboratory
laboratory
laboratory
the instrument is in contact with the measured object, it is suitable to measure the
potential on the conductor, the
ac can also be used
small volume, non-contact||contact measurement
small volume, non Contact measurement Non-contact measurement Measure the ground resistance value of various devices Suitable for solid medium high insulation measurement Portable equipment is easy to prepare Affected by air humidity and measurement system capacitance, it will produce a certain error Can measure the resistance value of low resistance conductors Can measure micro current of 10-16A There are many types of instruments According to Q2C·V Additional instructions: GB12367--90 This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Safety Standardization of Painting Operations. This standard was drafted by the Engineering Design Institute of the Ministry of Machinery and Electronics Industry, and the Jiangsu Provincial Institute of Labor Protection Science and Technology and Jiangsu Taicang County Electrostatic Equipment Factory participated in the drafting.
The drafters of this standard are Hu Zhusheng, Han Yunsheng, Feng Qi, Jin Xuefang, and Chen Ping. 266
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