JB/T 7504-1994 Technical requirements for electrostatic spraying equipment
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Electrostatic Spraying Equipment
Subject Content and Scope of Application
JB/T7504-1994
This standard specifies the models, technical requirements, tests, installation and safe use of electrostatic spray guns and related equipment. This standard applies to various electrostatic spray guns and related equipment for spraying flammable materials, and also to other similar equipment that may produce explosive gases when spraying flammable materials.
Reference Standards
GB14773—1993 Safety Regulations for Painting Operations Technical Safety Conditions for Electrostatic Spray Guns and Auxiliary Devices JB5832--1991 High Voltage Electrostatic Generator for Painting 3 Terms
3.1 Paint Spray Volume
The volume of paint with a specified viscosity sprayed from the spray gun nozzle per unit time. 3.2 Mist Width
The size of the geometric shape of the sprayed paint mist on the normal plane at a specified distance. 3.3 Static voltage
refers to the average value of the DC voltage output at the spray gun nozzle. 3.4 Encircling effect
refers to the encircling effect of paint particles on the back of the workpiece when they move along the electric lines in the high-voltage electrostatic field. 3.5 Air consumption
refers to the air consumption per unit time when the electrostatic spraying equipment is working. 3.6 Mist width direction
refers to the center axis direction of the sprayed paint mist. 3.7 Equivalent caliber
describes the special-shaped hole nozzle with the same amount of paint sprayed as the round hole nozzle. 4
Model and model spectrum
4.1 Model
Approved by the Ministry of Machinery Industry on October 25, 1994
Implementation on October 1, 1995
1073
(1,2.3,4,5)
JB/T7504—1994
Output DC voltage rating (kV)
Paint spray volume (mL/tnin)
Auxiliary atomization method
1—Compressed air type; 2—Paint pressurized type; 3—High-pressure airless type 4—Air-assisted pressure type; 5—Centrifugal type
-Equipment
Spraying
Electrostatic
Note: ESEq is the first letter of each English word for electrostatic spraying equipment. Where; E=Electrostatic, S-Spray, Eq=Equipment4.2 Model spectrum
4.2.1 DC high voltage output rating level
The DC high voltage output rating of electrostatic spraying equipment should be selected from the following values ??(unit: kV) 60, 80, 100, 120, 140
4.2.2 Maximum paint spraying volume level
The maximum paint spraying volume of electrostatic spraying equipment should be selected from the following values ??(unit: mL/min) 50, 100, 200, 400, 800, 1000, 1500 Example: ESEq3-1000/80 is a high-pressure airless electrostatic spraying equipment with a spraying volume of 1000 mL/min and an output DC voltage rating of 80 kV.
5 Performance
5.1 Paint spraying volume, air consumption and spraying mist width The electrostatic spraying equipment specified in this standard uses compressed air as paint auxiliary atomization power, or directly pressurizes the paint to expand and atomize. It also uses the centrifugal force of mechanical rotation as paint auxiliary atomization power. Table 1
Paint supply method
Air pressure delivery
Pump pressure delivery
High pressure airless
Air assisted pressure
Size of coated area
Large, small
Paint mist shape
Oval, round
Sugar round, round
Oval, round
Oval
Sugar round
Oval, round
Nozzle equivalent diameter
0. 8~-1. 8
1.3-~3.0
0.8~~1.2
1.02.0
1.5~~3.0
0. 4~2. 0
Air consumption
/(L/min)
160~300
280~560
270~340
500~720
160~300
Paint spray volume
/(mL/min)
45~130
120270
150~~240
250~~700| |tt||500～1500
4001500
Mist width size
60~150
150~260
150~180
200~340
400-680
300~700
The three-dimensional shape of the sprayed paint mist should be adjustable, the mist width should be correct and not deviate, the mist width distribution should be normal, and there should be no coarse paint particles that affect the film thickness and film appearance.
The nozzle (rotary disc or rotary cup) size, paint spray volume, air consumption and spray mist width size of the electrostatic spraying equipment are shown in Table 1 and Table 2.
1074
Disc
Round cup
Speed/(r/min）
10 000~30 000
20 000~70 000
JB/T 7504—1994
Table 2
Maximum coating spraying volume/（mL/min）
200-900
400~900
Dish (or cup) diameter/mm
135~$250
$50100
Air consumption/（L/min）
5.2 There should be a good "embracing effect" during spraying. Test spraying is carried out on a cylindrical workpiece with a diameter of 40mm. When the dry film thickness of the workpiece is about 20μm, the error of the dry film thickness on the front and back of the workpiece should be ensured to be no more than 5um. 6 Technical requirements
6.1 Electrical
6.1.1 Except for the parts designed to carry high voltage, all non-charged parts of the electrostatic gun should be designed and assembled so that they can maintain each other. The passage should be reliably connected to the ground wire of the power supply end of the high-voltage generator. 6.1.2 The high-voltage electrostatic generator should fully comply with the requirements of standard JB5832 in terms of technology and performance. 6.1.3 All cables should be firmly connected to the gun. In addition to the equipment with a grounding safety circuit, the cables should include a grounded metal shield. 6.1.4 The control system of the electrostatic spray gun should include overvoltage, overcurrent control, and short-circuit current limiting control to ensure safe use and personal safety of the operator. 6.2 Mechanical
6.2.1 The total surface area of ??the gun handle should be at least 20cm. The gun handle should be metal or a material with a maximum resistivity of 10α·m, and the surface should be connected to the ground end.
6.2.2 The spray gun control trigger should be designed in the "off" position. The high-voltage power supply and the spray material delivery pipeline should be cut off within 0.5s after the trigger is released. For the high-voltage supply of multiple outputs, releasing the trigger can successfully cut off each high-voltage end, otherwise it cannot be used. 6.2.3 The mechanical rotary auxiliary atomizing head can be driven by an electric motor or an air motor. The air motor has a high speed, good atomization effect, and is safe and reliable. It is recommended to use an air motor.
6.3 Nozzles, rotary cups and rotary discs
6.3.1 Regardless of the form and structure of the nozzle, the rotary cup or rotary disc should ensure that the paint spray volume is stable, the size, shape and position of the spray mist are stable, and the atomization effect is good.
6.3.2 The nozzle, rotary cup or rotary disc should be made of wear-resistant materials. The "equivalent caliber" of the spray should comply with Table 3.
6.3.3
Table 3
Paint supply method
Air pressure feeding type
Pump pressure feeding type
High pressure airless type
Air assisted pressure type
Size of coated object
Shape of forest
Ellipse, circle
Ellipse, circle
Sugar circle, circle
Orange country, fungus
Ellipse
Shape
Ellipse, circle
Nozzle equivalent diameter
0.81.01.21.31.51.61.8
1.31.51.6 1.8 2.0- 3.0
0.8 1.0 1.2
1.01.21.31.51.61.82.0
0. 4 0.6- 1. 0
0.8 1.0
6.3.4 The rotary auxiliary chemical head is divided into two types: rotary cup and rotary disk. The diameters shall conform to Table 4.1.8 2. 0 2.5 3. 0
2.02.5
1075
Diameter of rotary cup
Diameter of rotary disk
6.4 Paint supply equipment
JB/T 7504—1994
Table 4
$100
$135
$150
6.4.1 Paint supply equipment can be in various forms: paint bucket, pressure bucket, pressure pump, high-pressure airless pump, etc. 6.4.2 Paint supply equipment should ensure stable and uniform paint delivery. 6.4.3 Paint supply equipment should generally have a stirring function. 6.4.4 Paint supply equipment for water-based paint should have sufficient insulation resistance to the ground. Operating environment
(1) Temperature: -10℃~~+40℃
(2) Relative humidity: ≤85% (when the air temperature is (20±5)℃) (3) Altitude not exceeding: 1000m
(4) Power supply voltage: ac (220±10%)V (except for special orders) (5) Power supply frequency: 50Hz (except for special orders) (6) Generator grounding resistance: ≤4Q
$200
(7) There shall be no conductive explosive dust, no gas or liquid that corrodes metal and destroys insulation, and no severe vibration and impact at the operating location. 8 Marking, packaging, transportation and storage
8.1 Marking
Durable markings shall be set in obvious places of electrostatic spraying equipment and related equipment. The mark should include the following:
a) manufacturer name or registered trademark;
b) product name and model:
c) power supply voltage, frequency;
d) output rated voltage, current;
e) protection type and level,
f) manufacturing date and number.
8.2 Packaging
8.2.1 Electrostatic spray guns and related equipment should be well packed. Their vulnerable and deformable parts should be placed in fixed buffer materials. 8.2.2 Guns and equipment should be packed with materials with good moisture resistance and rain protection measures. mm
$300
8.2.3 The packaging box should be clearly marked with "" and "Ning" and the words "upward" and "prevent rain" should be written above the mark. 8.3 Transportation and storage
8.3.1 During loading, unloading and transportation, strong vibration, inversion and rain protection should be prevented. 8.3.2 It should be stored in a dry and well-ventilated room, and there should be no corrosive gas or liquid around it. 9 Operation and Instructions
The instructions should be provided by the manufacturer of the equipment, and the language of the instructions should meet the customer's requirements. The contents of the instructions should include the use, installation, maintenance and safety precautions of the equipment. 9.1 Operation
9.1.1 Electrostatic spraying equipment should be used by operators who have received job technical training and obtained an operator qualification certificate. 9.1.2 Warning signs should be set up in a prominent position in the operating area in a language that the operator understands. The signs should indicate various safety issues during the operation process.
JB/T 7504—1994
9.1.3 The shoes and gloves used by the operator should have anti-static function (the recommended resistance value is not more than 10″0).9.2 Installation
9.2.1 Floor
The floor of the operating area should be anti-static, and no residue is allowed to accumulate on the floor.9.2.2 Operating area
The surface resistance of the structure around the operating area to the ground should be less than 1Ma, and the opening of the workpiece channel should not be used as aisles by the sky.9.2.3 Exhaust
The operating area should be forced to ventilate and ensure that explosive gases are discharged in time, and clean fresh air is replaced at the same time. It should be ensured that the electrostatic spraying equipment shall not be turned on when the exhaust system is stopped. Where conditions permit, the exhaust system should be interlocked with the electrostatic spraying equipment.9. 3 Maintenance and repair
The cleaning and repair of the spray gun should be included in the instruction manual, and at least the following warnings should be included: 9.3.1 Before cleaning the spray gun or performing other work at the spraying site, the power must be turned off and short-circuited to the ground in advance to eliminate the electrical energy stored in the spraying equipment.
9.3.2 Only metal containers can be used to hold cleaning fluids, and the containers should be reliably grounded. 9.3.3 The flash point of the cleaning solvent used should be as high as possible, preferably higher than room temperature. 9.3.4 Electrostatic spraying equipment should be regularly maintained and serviced according to the manufacturer's instructions. 10 Testing and inspection
Electrostatic spraying equipment must undergo electrostatic generator testing and inspection, installation testing and inspection, and spraying performance testing and inspection by the manufacturer. 10.1 Electrostatic generator testing and inspection|| tt||The electrostatic generator test is carried out according to Articles 6.3 and 6.4 of JB5832-1991. The items are:
a) Insulation test;
b) Load test;
c) Short-circuit current test;
d) Overcurrent protection test;
e) No-load voltage test:
f) No-load impact test;
g) Load operation test;
n) Temperature rise test;
i) Safety test;
j) General test.
10.2 Safety test and inspection
Safety test and inspection are carried out according to GB14773-1993, and its main contents include: a) Impact test;
b) Drop test;
c) Ignition test;
d) High-voltage cable tension test;
e) High-voltage insulation test:
f) Pressure test.
10.3 Spraying performance test and inspection
The electrostatic spraying equipment as a whole shall be subjected to performance test and inspection in accordance with Chapter 5 of this standard. 1077
JB/T7504—1994
The performance test and inspection include the amount of paint sprayed, air consumption, spray mist width, paint film thickness, embracing effect, etc. The anti-static gloves and anti-static floors used during the installation of electrostatic spraying equipment shall be subjected to corresponding tests. 10.4
Additional notes:
This standard was proposed and coordinated by Wuhan Institute of Material Protection. This standard was drafted by Wuhan Institute of Material Protection, and Beijing Electrostatic Equipment Factory participated in the drafting. The main drafters of this standard are Zhang Shaoshan and Sun Nansi. 10783 The shoes and gloves used by the operator should have anti-static function (the recommended resistance value is not more than 10″0). 9.2 Installation
9.2.1 FloorwwW.bzxz.Net
The floor of the operating area should be anti-static, and no residue is allowed to accumulate on the floor. 9.2.2 Operating area
The surface resistance of the structure around the operating area to the ground should be less than 1Ma, and the opening of the workpiece channel should not be used as aisles by the sky. 9.2.3 Exhaust
The operating area should be forced to ventilate to ensure that explosive gases are discharged in time and replaced with clean fresh air. It should be ensured that the electrostatic spraying equipment shall not be turned on when the exhaust system is stopped. Where conditions permit, the exhaust system should be interlocked with the electrostatic spraying equipment. 9.3 Maintenance and repair
About spray gun cleaning and repair At least the following warnings should be included in the instruction manual: 9.3.1 Before cleaning the spray gun or performing other work at the spraying site, the power must be turned off and the ground must be short-circuited in advance to eliminate the stored energy in the spray equipment.
9.3.2 Only metal containers can be used to hold cleaning fluids, and the containers should be reliably grounded. 9.3.3 The flash point of the cleaning solvent used should be as high as possible, preferably higher than room temperature. 9.3.4 Electrostatic spray equipment should be repaired and maintained on schedule according to the manufacturer's instructions. 10 Testing and Inspection
Electrostatic spray equipment must undergo electrostatic generator testing and inspection, installation testing and inspection, and spray performance testing and inspection by the manufacturer. 10.1 Electrostatic Generator Testing and Inspection
The electrostatic generator test is carried out in accordance with JB5832-1991 6.3 and 6.4. The items are:
a) Insulation test;
b) Load test;
c) Short-circuit current test;
d) Overcurrent protection test;
e) No-load voltage test:
f) No-load impact test;
g) Load operation test;
n) Temperature rise test;
i) Safety test;
j) General test.
10.2 Safety test and inspection
Safety test and inspection shall be carried out in accordance with GB14773-1993, and its main contents include: a) Impact test;
b) Drop test;
c) Ignition test;
d) High-voltage cable tension test;
e) High-voltage insulation test:
f) Pressure test.
10.3 Spraying performance test and inspection
The overall electrostatic spraying equipment shall be subjected to performance test and inspection in accordance with Chapter 5 of this standard. 1077
JB/T7504—1994
Performance test and inspection include paint spraying volume, air consumption, spray mist width, paint film thickness, embracing effect, etc. The anti-static gloves and anti-static floors used during the installation of electrostatic spraying equipment shall be subjected to corresponding tests. 10.4
Additional notes:
This standard was proposed and coordinated by Wuhan Institute of Materials Protection. This standard was drafted by Wuhan Institute of Materials Protection, and Beijing Electrostatic Equipment Factory participated in the drafting. The main drafters of this standard: Zhang Shaoshan and Sun Nansi. 10783 The shoes and gloves used by the operator should have anti-static function (the recommended resistance value is not more than 10″0). 9.2 Installation
9.2.1 Floor
The floor of the operating area should be anti-static, and no residue is allowed to accumulate on the floor. 9.2.2 Operating area
The surface resistance of the structure around the operating area to the ground should be less than 1Ma, and the opening of the workpiece channel should not be used as aisles by the sky. 9.2.3 Exhaust
The operating area should be forced to ventilate to ensure that explosive gases are discharged in time and replaced with clean fresh air. It should be ensured that the electrostatic spraying equipment shall not be turned on when the exhaust system is stopped. Where conditions permit, the exhaust system should be interlocked with the electrostatic spraying equipment. 9.3 Maintenance and repair
About spray gun cleaning and repair At least the following warnings should be included in the instruction manual: 9.3.1 Before cleaning the spray gun or performing other work at the spraying site, the power must be turned off and the ground must be short-circuited in advance to eliminate the stored energy in the spray equipment.
9.3.2 Only metal containers can be used to hold cleaning fluids, and the containers should be reliably grounded. 9.3.3 The flash point of the cleaning solvent used should be as high as possible, preferably higher than room temperature. 9.3.4 Electrostatic spray equipment should be repaired and maintained on schedule according to the manufacturer's instructions. 10 Testing and Inspection
Electrostatic spray equipment must undergo electrostatic generator testing and inspection, installation testing and inspection, and spray performance testing and inspection by the manufacturer. 10.1 Electrostatic Generator Testing and Inspection
The electrostatic generator test is carried out in accordance with JB5832-1991 6.3 and 6.4. The items are:
a) Insulation test;
b) Load test;
c) Short-circuit current test;
d) Overcurrent protection test;
e) No-load voltage test:
f) No-load impact test;
g) Load operation test;
n) Temperature rise test;
i) Safety test;
j) General test.
10.2 Safety test and inspection
Safety test and inspection shall be carried out in accordance with GB14773-1993, and its main contents include: a) Impact test;
b) Drop test;
c) Ignition test;
d) High-voltage cable tension test;
e) High-voltage insulation test:
f) Pressure test.
10.3 Spraying performance test and inspection
The overall electrostatic spraying equipment shall be subjected to performance test and inspection in accordance with Chapter 5 of this standard. 1077
JB/T7504—1994
Performance test and inspection include paint spraying volume, air consumption, spray mist width, paint film thickness, embracing effect, etc. The anti-static gloves and anti-static floors used during the installation of electrostatic spraying equipment shall be subjected to corresponding tests. 10.4
Additional notes:
This standard was proposed and coordinated by Wuhan Materials Protection Research Institute. This standard was drafted by Wuhan Materials Protection Research Institute, and Beijing Electrostatic Equipment Factory participated in the drafting. The main drafters of this standard: Zhang Shaoshan and Sun Nansi. 1078
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