GB 5959.6-1987 Safety of electric heating equipment Part 6 Special requirements for industrial microwave heating equipment
Some standard content:
1 Fuze
National Standard of the People's Republic of China
Safety of electric heating equipment
Part 6·Special requirements for industrial microwave heating equipment
Safety in electroheatinstallatlonsPart 6, Particular requirements for industrial microwaveheating installations
UDC921.365
:614.825
GB 5959.6—87
1.1 This standard applies to the use of microwave energy or the use of microwave energy and other forms of energy Equipment for industrial heating of materials together (hereinafter referred to as microwave equipment).
1.2 In addition to meeting this standard, microwave equipment should also meet the provisions of GB5959 "Safety of Electric Heating Equipment Part 1 General Requirements".
1.3 This standard is equivalent to the international standard IEC519-6 "Safety of Electric Heating Equipment Part 6 Safety Specifications for Industrial Microwave Heating Equipment" 1982 first edition (hereinafter referred to as IEC519-6). 2 Terms
Except for the following terms, the definitions of other terms used in this standard can be found in each chapter of GB2900 Electrical Terminology, especially GB2900.23 Electrical Terminology Industrial Electric Heating Equipment and GB5959.1 . 2.1 Microwave energy generator
Electromagnetic energy generator with a frequency of 0.3~300GHz. 2.2 Microwave leakage
The surface power density of microwaves leaking from microwave equipment. 2.3 Heater door
It is a structural member on the heater port that can be opened without tools in order to inlet and outlet materials. 2.4 Chassis door
In microwave equipment, other entrances except the heater, a structural part that can be opened without tools. 2.5 Cladding
On microwave equipment, in order to provide access for maintenance, it is a structural member that can only be opened using tools. 2.6 Inlet or outlet
The permanent opening on the heater of continuous microwave equipment through which the material to be processed enters or exits the heater. 2.7 Accessible parts
refers to all parts that are easily accessible to staff except the inside of the entrance and exit. Approved by the National Machinery Industry Commission on 1987-03-23 ??and implemented on 1988-01-01
3 nameplates and signs
GB5959.6-87
3.1 Each microwave equipment should have a nameplate. The nameplate should include the following: product model and name;
a.
b.
c.
rated input voltage and frequency;
rated Input apparent power;
Under stable operating conditions, the highest voltage, microwave frequency and maximum output power in the microwave energy generator; d.
e.
f.|| tt||g.
Microwave warning sign;
Product number;
Manufacture date;
h.Manufacturing name.
The writing on the nameplate should be clear and durable. The nameplate should be mounted on a prominent part of the microwave equipment body. 3.2 For microwave equipment with inlets and outlets or easily accessible heater vents, the following or related instructions shall be clearly marked in one or more necessary languages ??in a conspicuous place near each inlet, outlet or vent. Quite a warning. Warning
Microwave radiation hazard
Do not insert foreign objects
4 Protection against electric shock
or
Warning
Do not insert foreign objects|| tt||The design, manufacture and operation of microwave equipment should be able to fully prevent the risk of electric shock and should meet the requirements of Chapter 10 of GB5959.1. Note: Some requirements in this chapter do not apply to the microwave component circuits on microwave equipment. 5 Protection from microwave leakage
5.1 The design, manufacture and operation of microwave equipment should be able to fully prevent the radiation hazard caused by microwave leakage. For microwave equipment where the heater may be in contact with the human body, a heater door should be installed or other forms of protection measures should be taken. For microwave equipment in the "normal operation" state, the microwave leakage power density shall not be greater than 5mW/cm21) at an easily accessible location where the distance from any part of the equipment is equal to or greater than 0.05m. For microwave equipment in "abnormal operation" state, it shall not exceed 10mW/cm22). 5.1.1 Microwave equipment with barriers to restrict people's access may comply with the provisions of Article 5.1 if the barriers have microwave interlocking devices that comply with Article 5.4.2. In this case, 0.05m refers to the distance from the barrier\. 5.1.2 The maximum radiation amount of microwave radiation at the position of the microwave equipment operator is specified as follows: Adoption instructions:
1) The first line of this paragraph of IEC519-6: Huiwave equipment in normal operation , there is a paragraph before it, that is, "Based on current knowledge, before conclusions can be drawn from ongoing work in different countries, regulations...2) IEC519-6 There is a note after this paragraph: "Note: Microwave leakage specified above The limit value of power density can be reduced in the future if necessary." 3] There is no "distance in this case" in Article 5.1.1 of IEC519-6. "This paragraph. 4) Corresponds to Article 5.1.2 of IEC519-6, but the original text is: "This standard only covers microwave leakage at a distance of 0.05m from any accessible part of the microwave equipment. The standards of some countries stipulate the maximum amount of microwave radiation at the location of the operator, and some countries are also considering the allowable amount of radiation. Some countries stipulate the product of the square of the power density at the operator's location and the radiation time, so the maximum surface power received by people may be many times lower than the value specified in Article 5.1. In order to determine compliance with these national standards, the microwave leakage at the operator's location should be measured."
GB5959.6-87
The average power density of 8 hours of exposure per day is 50 μW/cm\, less Or the average power density of more than 8 hours of exposure is calculated by the following formula a.
(that is, the daily dose does not exceed 400 μWh/cm2). In the formula: P, - allowable radiation power density (μW/cm2); t - radiation time. (h). | |tt | In addition to the exposure time, personal protection must be used, but the maximum radiation intensity at the operating position shall not be greater than 5mW/cm2. 5.1.3 Microwave leakage far away from the microwave equipment shall comply with GB4824.1 "Radio Interference Allowance for Industrial, Scientific and Medical Radio Frequency Equipment" Value" and the provisions in GB4824.2 "Measurement Method of Radio Interference Characteristics of Industrial, Scientific and Medical Radio Frequency Equipment". 5.2 Measurement of microwave leakage
The measurement of microwave leakage should use instruments that meet the following requirements, and be carried out in accordance with Perform 2 under the conditions of 5.3. For step-like input signals, the instrument should reach 90% of the actual stable value within 2 to 3 seconds; a.
b. With a non-polarized sensor that can only work in close proximity Radiation detector; c. It can measure the power density (plane wave) of 510mW/cm2 within the operating frequency range of microwave equipment, and its accuracy is 2% (equivalent to ±1dB)
5.3 Measurement conditions||tt. ||5.3.1 Normal operation
The microwave input power range and material type negotiated between the manufacturer and the user, as well as the allowed working conditions of the microwave equipment, should be measured 0.05m and further away from any accessible part of the microwave equipment. Maximum microwave leakage. Note: The extreme operating conditions allowed for short-term testing do not apply to normal operation. 5.3.2 Abnormal operation with workpieces should be carried out after opening or removing all cabinet doors and heaters. Repeat the measurement in 5.3.1 for doors and covering panels, except when the interlocking device of these cabinet doors, heater doors and covering panels can interrupt the generation of microwave power when opening or removing them. When the interlocked casing door, covering panel and heater door are adjusted to the most unfavorable position, but microwave power can still be generated, repeat the measurement in 5.3.1
5.3.3 without the workpiece. Abnormal operation
Repeat 5.3 when there is no material to be heated in the heater and the microwave energy generator is adjusted to the maximum power allowed by the interlock device or the maximum power that does not cause damage to the microwave equipment. Measurements of 1 and 5.3.2 5.4 Requirements for microwave interlocking devices
5.4.1 Heater door
When the heater door of the microwave equipment is opened, at least two microwave interlock devices shall be activated. The interlock device shall be designed to be reliable and have a long service life. When the mechanical or electrical interlock device of the heater door fails, an alarm shall be sounded and the microwave equipment shall be stopped at the same time. When any electrical or mechanical component fails, all microwave interlock devices of the heater door shall not be ineffective. At each heater door, at least one microwave interlock device shall be concealed so that when the heater door is open, closed or in any intermediate position, the interlock device cannot be activated by any part of the human body. The microwave interlock device shall be designed to ensure that when the heater door is opened or closed, the microwave leakage does not exceed the limit value specified in Article 5.1. Adoption instructions:
1) Corresponds to Article 5.1.3 of IEC519-6, but the original text is: "In addition, microwave leakage far from the device shall comply with the provisions of Publication 11 of the International Special Committee on Radio Interference (CISPR): "Limits and methods of measurement of radio interference characteristics of radio frequency devices for industrial, scientific and medical (ISM) use (except surgical diathermy instruments)". 2) The original IEC519-6 did not have this sentence, and the last paragraph of Article 5.1 was moved here and rewritten. 5.4.2 Casing doors and covers
GB5959.687
If the casing door or cover of the microwave equipment is opened or removed, and the microwave leakage exceeds the specified value in Article 5.1, at least one microwave interlock device should be activated when the casing door or cover is opened or removed. Usually, in order to ensure safety, two independent interlock devices are required. The interlock device should not be adjusted to a state close to the critical state to avoid frequent adjustments.
5.4.3 Microwave absorption device
For microwave equipment with liquid flow microwave energy absorption device, when the liquid flow rate at the outlet of any absorption device decreases or the liquid flow pressure decreases so that the microwave leakage exceeds the limit value specified in Article 5.1, at least one microwave interlock device should be activated\. 5.5 Instructions for use and maintenance
The microwave equipment manufacturer shall provide the necessary documents for the use and maintenance instructions for each model of the product, and the contents shall include warnings and precautions to avoid exposure to leaked microwaves. The model and manufacturer's address of the microwave generator shall also be given in the instructions. The following label contents shall also be given in the instructions, and the user shall be responsible for making the label and hanging it on the equipment. Note
Strictly prevent the staff from being exposed to the microwave energy radiated by the microwave generator. In order to ensure that the microwave leakage does not exceed the specified limit value, all joints, waveguides, flanges, gaskets, etc. must be reliable, and the microwave equipment shall not be used without an absorbing load. In order to keep the microwave leakage within the allowable value, the equipment shall be regularly inspected and maintained to keep it in good working condition. 5.6 Other safety measures
Each microwave power supply shall be equipped with a device that gives an appropriate signal when the power is turned on, and the signal shall be conspicuous to everyone entering the microwave equipment area bzxz.net
There shall be an indicator on the microwave equipment to display the microwave power level. Note: When the microwave equipment has several microwave power supplies, measures should be taken to display the power from each microwave power supply, either by using multiple indicators or by using an indicator that can be switched to each microwave power supply. For microwave power supplies with a total output power equal to or greater than 25kW, a safety lock should be installed on the power control panel, which needs to be unlocked with a key before generating microwave energy.
6 Protection against burns, fire, explosion and ionizing radiation 6.1 Overview
? In the design, manufacture and operation of microwave equipment, consideration should be given to minimizing the risk of burns, fire and explosion. In addition to the provisions of Chapter 12 of GB5959.1, the following requirements should also be met. 6.2 Protection against ionizing radiation
The X-ray leakage from the microwave energy generator measured at the outer surface of the microwave equipment should not exceed the provisions of GB4792 "Basic Standard for Radiation Health Protection".
6.3 Explosion-proof
6.3.1 Microwave heating should not be used in houses with explosion hazards. Generally, microwave heating should not be used for materials that may cause explosion hazards when heated. When these materials must be heated, the following provisions should be followed. 6.3.2 If the flammable gas released by the workpiece during the heating process has the potential to explode, special precautions should be taken to avoid the formation of explosive nitrogen gas during the heating process. It is recommended that GB5959.6-87
provide sufficient air in the furnace to ensure that the ratio of flammable gas to air does not exceed one-fourth of the lower limit of the flammable range; b. Install a safety mechanism. When the exhaust system fails, it can automatically cut off the microwave energy input to the heater: c. Microwave ovens with a volume greater than 0.5m3 and the possibility of producing flammable gases should be equipped with explosion-proof valves. 6.3.3 Special precautions should be taken to avoid arcing in the heater. The following two points should be emphasized in the instruction manual: a. Keep the mating surface of the heater door and the inside of the heater clean b: Ensure that there are no metal foreign objects mixed in the heated material, in order to reduce To avoid the danger of arc formation, it is recommended that the heater door adopt a choke structure instead of a metal-to-metal contact structure. 6.4 Fire prevention
If flames that endanger safety may be caused by overheating of materials, it is recommended to add the following to the microwave equipment as much as possible: 8. Automatic device to indicate the presence of flame:
b. Automatic device to cut off the continued transmission of microwave energy and other forms of energy to the material when a fire occurs: c. Automatic device to stop the transmission of materials to the heater in the event of a fire: d. Automatic fire extinguishing device.
If the fire may be caused by an arc in the heater, the preventive measures described in Article 6.3.3 should be taken at the same time. If the microwave equipment is operated in a house prone to fire, the corresponding preventive measures described in Article 6.3 should be taken. Additional notes:
This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafter of this standard is Li Chuanyang,
6 Other safety measures
Each microwave power supply should be equipped with a device that gives an appropriate signal when the power is turned on. The signal should be conspicuously visible to everyone entering the microwave equipment area
In microwave There should be an indicator on the device to show the level of microwave power. Note: When the microwave equipment has several microwave power supplies, measures should be taken to display the power from each microwave power supply, or use multiple indicators, or use an indicator that can be switched to each microwave power supply. For microwave power supplies with a total output power equal to or greater than 25kW, a safety lock should be installed on the power control panel, and a key must be used to unlock it before generating microwave energy.
6 Protection against burns, fire, explosion and ionizing radiation 6.1 Overview
? In the design, manufacture and operation of microwave equipment, consideration should be given to minimizing the risks of burns, fires and explosions. In addition to the provisions of Chapter 12 of GB5959.1, the following requirements should also be met. 6.2 Protection against ionizing radiation
6.3 Explosion-proof
6.3.1 Microwave heating should not be used in houses with explosion risks. In general, microwave heating should not be used on materials that pose a risk of explosion when heated. When it is necessary to heat these materials, the following provisions should be followed. 6.3.2 If the flammable gas released by the workpiece during the heating process has a potential explosion hazard, special precautions should be taken to avoid using instructions:
1) The original IEC519-6 does not have or liquid flow pressure "Reduce". To avoid the formation of explosive nitrogen gas during the heating process. It is recommended that GB5959.6-87
provide sufficient air in the furnace to ensure that the ratio of flammable gas to air does not exceed four quarters of the lower limit of the flammable range. 1; b. Install a safety mechanism that can automatically cut off the microwave energy input to the heater: c. Microwave ovens with a volume greater than 0.5m and that may produce flammable gases should be equipped with explosion-proof valves 6.3. .3 Special precautions should be taken to avoid arcing in the heater. The following two points should be particularly emphasized in the instruction manual: a. Keep the mating surface of the heater door and the inside of the heater clean. b. Ensure that the materials to be heated are kept clean. There should be no metal foreign matter in the heater door. In order to reduce the risk of arc formation, it is recommended that the heater door adopt a choke structure instead of a metal-to-metal contact structure. 6.4 Fire protection
If overheating of the material may cause a safety-threatening flame, It is recommended to add to the microwave equipment as much as possible: 8. Automatic device to indicate the presence of flame:
b. Automatic device to cut off the continued transmission of microwave energy and other forms of energy to the material in the event of a fire: c. Automatic device to stop material delivery to the heater in the event of a fire: d. Automatic fire extinguishing device
If the fire may be caused by arcing in the heater, the precautions described in 6.3.3 shall be taken at the same time. Measures If the microwave equipment is operated in a house prone to fire, the corresponding preventive measures described in Article 6.3 should be taken. Additional remarks:
This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute. The Electric Furnace Research Institute is responsible for drafting this standard. Li Chuanxiang,
6 Other safety measures
Each microwave power supply should be equipped with a device that gives an appropriate signal when the power is turned on. The signal should be conspicuously visible to everyone entering the microwave equipment area
In microwave There should be an indicator on the device to show the level of microwave power. Note: When the microwave equipment has several microwave power supplies, measures should be taken to display the power from each microwave power supply, or use multiple indicators, or use an indicator that can be switched to each microwave power supply. For microwave power supplies with a total output power equal to or greater than 25kW, a safety lock should be installed on the power control panel, and a key must be used to unlock it before generating microwave energy.
6 Protection against burns, fire, explosion and ionizing radiation 6.1 Overview
? In the design, manufacture and operation of microwave equipment, consideration should be given to minimizing the risks of burns, fires and explosions. In addition to the provisions of Chapter 12 of GB5959.1, the following requirements should also be met. 6.2 Protection against ionizing radiation
6.3 Explosion-proof
6.3.1 Microwave heating should not be used in houses with explosion risks. In general, microwave heating should not be used on materials that pose a risk of explosion when heated. When it is necessary to heat these materials, the following provisions should be followed. 6.3.2 If the flammable gas released by the workpiece during the heating process has a potential explosion hazard, special precautions should be taken to avoid using instructions:
1) The original IEC519-6 does not have or liquid flow pressure "Reduce". To avoid the formation of explosive gas nitrogen during the heating process. It is recommended that GB5959.6-87
provide sufficient air in the furnace to ensure that the ratio of flammable gas to air does not exceed four quarters of the lower limit of the flammable range. 1; b. Install a safety mechanism that can automatically cut off the microwave energy input to the heater: c. Microwave ovens with a volume greater than 0.5m and that may produce flammable gases should be equipped with explosion-proof valves 6.3. .3 Special precautions should be taken to avoid arcing in the heater. The following two points should be particularly emphasized in the instruction manual: a. Keep the mating surface of the heater door and the inside of the heater clean. b. Ensure that the material to be heated is kept clean. There should be no metal foreign matter in the heater door. In order to reduce the risk of arc formation, it is recommended that the heater door adopt a choke structure instead of a metal-to-metal contact structure. 6.4 Fire protection
If overheating of the material may cause a safety-threatening flame, It is recommended to add to the microwave equipment as much as possible: 8. Automatic device to indicate the presence of flame:
b. Automatic device to cut off the continued transmission of microwave energy and other forms of energy to the material in the event of a fire: c. Automatic device to stop material delivery to the heater in the event of a fire: d. Automatic fire extinguishing device
If the fire may be caused by arcing in the heater, the precautions described in 6.3.3 shall be taken at the same time. Measures If the microwave equipment is operated in a house prone to fire, the corresponding preventive measures described in Article 6.3 should be taken. Additional remarks:
This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute. The Electric Furnace Research Institute is responsible for drafting this standard. Li Chuanxiang,
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