Some standard content:
1 Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
Safety of battery-powered electric tools
This standard specifies the general safety requirements and test methods for battery-powered electric tools. JB7787—1995
This standard applies to hand-held cordless electric tools (hereinafter referred to as tools) powered by rechargeable battery packs. This standard does not apply to tools and other electrical appliances in which the charging unit, motor unit, and battery pack unit are installed in the same housing. 2
Referenced standards
GB1002
GB4343
GB4583
GB4706.18
GB11013
GB11919
GB15092.1
ZBK32003
3.1 According to the purpose, it can be divided into:
Electric drill:
Single-phase plug and socket type, basic parameters and dimensions Safety of hand-held power tools Part 1: General requirements Measurement methods and allowable values of radio interference characteristics of power tools, household appliances and similar equipment Power tool noise Engineering method for the measurement of sound
Safety of household and similar electrical appliances Particular requirements for battery chargers Fire hazard tests for electrical and electronic products Glow-wire test methods and guidelines General specification for sealed cadmium nickel cylindrical alkaline storage batteries Dimensional interchangeability requirements for plugs, sockets and couplers for industrial use Plugs and sockets and sockets for appliance switches Part 1: General requirements
Appliance couplers for household and similar purposes
Impact drills;
Electric screwdrivers;
Combined tools for electric drills and screwdrivers;
Sanding machines;
Polishing machines:
Grinding machines;
Cut machines;
Jig saws.
The classification of tools is not subject to this clause.
3.2 According to whether there is a speed control function, they are divided into:
Speed control;
No speed control.
Approved by the Ministry of Machinery Industry on October 9, 1995
Implemented on January 1, 1996
Saw blade handle connection dimension inspection
6.3 Inspection method
JB/T3973-1995
6.3.1 The test shall be carried out in the order of the items listed in Article 6.2. 6.3.2 Except for some parts that need to be provided separately for the test of related items, the test items shall be carried out on the same prototype and pass all the tests.
If it is necessary to disassemble the prototype for the related test, another prototype can be added. 7 Marking and packaging
The nameplate of the jigsaw shall be marked with the following items: product name (electric jigsaw);
jigsaw model;
rated voltage V;
power type symbol;
rated input power, W or kW; or rated power A; maximum sawing thickness of sawn wood, .mm; working shaft no-load reciprocating times, times/min4 (ri: Class II structure symbol (only marked on Class II jigsaws); moisture resistance symbol (only marked when required); manufacturer name or trademark;
factory batch code.
7.2 When leaving the factory, the working shaft part of the jigsaw Temporary anti-rust coating and sealing protection measures should be taken. 7.3 Each jigsaw should be accompanied by the following documents when leaving the factory: 7.3.1 Product certificate
7.3.2 Instructions for use and maintenance
The instructions should explain the following contents: a) In the form of text or diagrams, indicate the reasonable advancement speed of the jigsaw for some representative materials, such as hardwood and steel (tensile strength 390MPa), mm/min;
b) Use an independent chapter to explain the safety and technical requirements for the use of jigsaws, including matters that must be paid attention to, possible dangers and corresponding preventive measures:
c) Relevant maintenance matters.
7.4 The packaging, transportation and storage of jigsaws should comply with relevant regulations. 8 Warranty period and spare parts
8.1 If the jigsaw is damaged or fails to work properly due to poor manufacturing quality within one year from the date of manufacture, including six months from the date of purchase, the manufacturer shall repair or replace it for free. 8.2 When the jigsaw leaves the factory, it shall be accompanied by the saw blade specified in the design, and at least two blades of each specification shall be equipped. Additional remarks:
This standard is proposed by the Ministry of Machinery Industry.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Electric Tools. This standard is drafted by Chengdu Electric Tool Factory. The main drafter of this standard is Xu Cheng
4 Rated value
The maximum rated voltage of the tool is DC 36V. JB7787—1995
Note: The rated voltage of the tool is the rated voltage of the battery pack. 5 Marking
5.1 Tools should be marked with the following markings:
Product name;
Product model;
Rated voltage, V;
DC power supply symbol
Rated no-load speed (or reciprocating times), r/min (or./min); Main working parameters (specified by the corresponding category of tool product standards); Adjustment, direction and other markings (depending on the category of tool) Manufacturer's name or trademark;
Production batch number or factory date;
2 Battery packs or battery boxes that can be replaced by users should be marked with the following markings: 5.2
Rated output voltage, V;
b) Polarity;
c) Manufacturer's name or trademark.
The nameplate should be placed in a conspicuous position on the surface of the corresponding shell; it should be firm and not curled. 5.3
The markings on tools and battery boxes should be clear and durable. 5.4
5.5 The instruction manual of the tool shall be written in the official language of the country where the tool is sold. The instruction manual of the tool shall include the following warnings: Only the recommended batteries and chargers shall be used: a) Batteries and battery packs shall not be mixed with metal objects such as coins and screwdrivers to prevent metal objects from shorting the batteries or battery packs; b) Batteries and battery packs shall not be placed near fire or in high temperature environments for a long time (such as sunlight exposure, near radiators and environments exceeding 50°C); c) Other warnings on the safe use of the tool. 5.6 Compliance with the requirements of 5.1 to 5.5 shall be checked by observation and the following test: Wipe the mark with a cloth soaked in water for 15 seconds, one back and forth per second; then wipe the mark with a cloth soaked in solvent benzine for the same period of 15 seconds. Molded, etched or stamped marks do not need to be wiped. 6 Noise
The noise sound pressure level (A-weighted) measured at 1000mm from the center of the tool when the tool is running without load should not be greater than the limit specified in the product standard of the corresponding category of battery-powered tools.
Measurement shall be carried out in accordance with the provisions of GB4583 to verify compliance with the requirements of this article. 7 Radio and television interference suppression
7.1 The radio and television interference suppressor installed in the tool shall not damage the tool and affect compliance with this standard. Compliance with the requirements of this article shall be verified by the test of this standard. JB77871995
7.2 For tools that require suppression of radio and television interference, the interference power shall not exceed the allowable interference power value specified in GB4343 for internal battery devices.
Measurement shall be carried out in accordance with the provisions of GB4343 to verify compliance with the requirements of this article. 8 Dielectric Strength
8.1 When in use, the working head may cut the live parts hidden inside the processing object, and thus the tool may be charged. The gripping part of the tool shall be made of insulating material or covered with insulating material. The surface of the gripping part and the accessible metal parts shall be able to withstand a test voltage of 500V with a real sine waveform of 50Hz for 1min without breakdown or flashover. Note: Tools that may cut the live parts hidden inside the processing object (such as wiring inside the wall) are specified in the product standards of such tools. 8.2 Compliance with the requirements of Article 8.1 shall be checked by the following withstand voltage test: metal foil is coated on the gripping part of the tool, and then a test voltage of 500V with a real sine waveform and a valid value of 500V is applied between the metal foil and the accessible metal parts of the working head for 1min. The initial applied voltage shall not exceed half of the specified value, and then it is rapidly increased to the full value.
The test transformer shall comply with the provisions of Article 15.3 of GB3883.1. 9 Durability
9.1 The tool shall be able to withstand the durability test specified in Article 9.2. During and after the test, the joints shall not become loose and the tool shall not have any damage that may endanger the safety of normal use.
9.2 Compliance with Article 9.1: The tool is operated intermittently without load for 15 h on an external DC power supply with a voltage equal to the rated voltage of the tool without batteries. The intermittent operation cycle consists of a 10 s "on" and 5 s "off" period, the "off" period still being included in the entire test period. \ The tool may not have its own on-off switch, but a switch "on" and "off". The tool is tested in three different positions as in normal use, and each position is operated for about 5 h. During the test, it is allowed to add grease as in normal use. During the test, the overload protector (if any) of the tool shall not operate. 10 Abnormal operation
10.1 The tool shall be able to withstand the stall test specified in Article 10.2. During and after the test, the connecting parts shall not be loose and the tool shall not have damage that endangers the safety of normal use.
10.2 Compliance with the requirements of Article 10.1 is checked by the following test: In the actual cold state, the output shaft of the tool is blocked in advance so that it cannot rotate. Turn on the switch for 5 seconds or until the battery is fully discharged (whichever is shorter). During the test, if the overload protector (if any) installed in the tool is activated, it can be considered to meet the requirements. 10.3 When the electronic device of the tool fails, its running speed should not increase to a dangerous level, and other dangers that may cause personal injury should not occur. Note: In addition to semiconductor devices, the electronic devices referred to in this article also include capacitors, resistors, inductors, etc. 10.4 Compliance with the requirements of Article 10.3 is checked by the following electronic device failure test: The tool simulates the following failure conditions in turn, and each runs without load for 1 minute: a) capacitor short circuit or open circuit;
short circuit between the two leads of any semiconductor device; b)
c) any lead of any semiconductor device is open. Each failure condition should be selected to produce the most unfavorable consequences. During the test, if the speed limiter (if any) installed in the tool works, it can be considered to meet the speed requirements. 10
JB7787-1995
10.5 If the direction of rotation of the tool needs to be changed during operation during normal use, the switch or other device that reverses the motor should be able to withstand the reversing test specified in Article 10.6. During the test, the reversing switch or device should not fail mechanically or electrically, and the contacts should not be excessively dented or burned; after the test, the tool should not be damaged in a way that would endanger the safety of normal use. This requirement does not apply to tools that can only be reversing when the switch is in the "off" position. 10.6 Compliance with the requirements of Article 10.5 is verified by the following test: Place the reversing device in a position that causes the motor to rotate in one direction, turn on the switch, and run the tool without load until it reaches full speed, then change the reversing device to a position that rotates in the opposite direction without pausing in the "middle" position. This operation procedure is repeated 25 times. 11 Mechanical Hazards
The tool shall comply with the provisions of Chapter 18 "Mechanical Hazards" of GB3883.1 and the national standards or industry standards for similar tools powered by the power grid. Check by observation and the methods specified in Chapter 18 of GB3883.1 and the inspection methods specified in the national standards or industry standards for similar tools powered by the power grid. 12 Mechanical Strength
12.1 The tool shall be able to withstand the extrusion test specified in Article 12.2 and the impact test specified in Article 12.3. After the test, the following situations shall not occur: a) The user may come into contact with the electrolyte of the battery due to damage to the battery pack casing; b)
The battery pack terminals are short-circuited due to the battery pack moving from its specified position, or parts that may cause short-circuit are exposed; c) The battery pack is short-circuited internally.
12.2 Compliance with 12.1 is checked by the following extrusion test: 12.2.1 The following parts are subject to the extrusion test: a) The part of the tool housing corresponding to the battery pack after the battery pack or the battery pack box containing the battery pack is installed in the normal use position of the tool;
The battery pack housing containing the battery pack can be removed from the tool after charging. 12.2.2 A compressive force of 1112N is applied to the specimen in a direction perpendicular to the main axis of the specimen (a test device capable of applying the specified compressive force to the test housing can be used). The test housing is placed between two parallel hardwood boards with a thickness of not less than 12.7 mm and a size sufficient to completely cover the tool. The compressive force shall be applied steadily and the specified compressive force shall be maintained for 1 min. 12.3 Compliance with 12.1 is checked by the following test: The battery pack or the battery pack box containing the battery pack is installed in the normal use position of the tool. Tie the tool handle with a rope and suspend the tool, as shown in Figure 9 of GB3883.1, and prepare the tool to hit a 5mm thick steel plate installed on a rigid wall. During the test, in a plane perpendicular to the wall, pull the tool away from the wall, with the rope basically straightened, pull the tool to a position where its center of gravity is 500mm above the starting position, and then release the tool to let it swing toward the steel plate. The test is carried out 4 times in total, and the tool is rotated in one direction each time. 13 Structure
13.1 The tool shall comply with the provisions of Articles 20.1 to 20.5 and Article 20.18 in Chapter 20 "Structure" of GB3883.1. 13.2 The tool shall be equipped with an "on-off" switch that can disconnect the circuit without the operator releasing his grip on the tool. For switches with a locking device (such as a self-locking button) in the "closed" position, it is considered to meet the requirements of this article if the locking device can be automatically unlocked by releasing the operating member of the switch. 13.3 The battery box that needs to be removed from the tool for charging should be easily inserted into and removed from the tool without the aid of tools. The structure of the battery pack, battery box and its clamping parts should: a) prevent accidental short circuit of the battery terminals after being installed in the tool and during normal use; ensure that the polarity of the connection between the two poles of the battery pack and the tool cannot be reversed after being installed in the tool; b) 1 c) have appropriate vents to dissipate the gas that may be generated by the battery when the tool is used to prevent gas accumulation. 11 JB77871995 Note: The joints at the inlays and the openings at the corners of the shell during the assembly process are considered to have provided vents for the release of battery gas. 13.4 The lugs or contacts used to connect the battery circuit in the tool should not be able to be electrically connected to the plugs, couplers or connectors that meet the types specified in GB1002, GB11919 or ZBK32003. 13.5 The gap between the plastic housing of the tool and parts that may generate arcs (e.g. commutator, unencapsulated switch contacts) shall not be less than 6.3 mm.
If it can be determined that the reduction of the gap will not cause the housing to catch fire under abnormal operating conditions, the gap may be reduced to less than 6.3 mm, but not less than 0.8 mm.
13.6 Compliance with the requirements of 13.1 to 13.5 shall be checked by inspection and manual test. Note: If the reduction of the gap can meet the requirements of Chapters 10 and 18, it can be considered that the housing will not catch fire. 14 Internal wiring
14.1 Tools shall comply with the provisions of Clauses 21.1 and 21.6 of Chapter 21 "Internal wiring" of GB 3883.1. 14.2 Internal wiring shall be arranged so that there is no risk of short circuit in normal use. If there is an insulating layer, the thickness of the insulating layer shall not be less than 0.4 mm. It is not allowed to wrap sharp edges with thermoplastic tape. 14.3 Battery leads and insulation (if any) in the battery compartment shall be acid or alkali resistant if they are likely to come into contact with acids or alkalis. 14.4 Compliance with the requirements of 14.1 to 14.3 shall be verified by observation, measurement and, if necessary, by special corrosion resistance tests. 15 Components
15.1 The rated voltage and current of the on-off switch of the tool shall be suitable for the tool. 15.2 The on-off switch shall comply with the provisions of GB15092.1 for switches used for Class II appliances and shall be rated for not less than 6000 operating cycles. 15.3 The on-off switch shall have sufficient switching capacity to connect and disconnect the tool's stall current 50 times each without generating a continuous arc, without the contacts being welded or excessively burned; the switch shall not have a risk of fire or other damage that endangers its safe use and shall continue to be used. 15.4 Compliance with the requirements of 15.1 to 15.3 shall be verified by observation and, if necessary, by tests in accordance with the provisions of GB15092.1. For switches with rated values, the rated current of the resistive load shall not be less than the load current when the tool speed reaches 50% of the no-load speed. For switches without rated values, the load current when the tool speed reaches 50% of the no-load speed shall be used as the rated current of the resistive load of the switch for testing.
According to GB15092.1 When conducting the durability test, the electrical conditions are handled according to the specific load, that is, the current of the switch on and off is the actual on and off current when the tool is unloaded (both refer to the average characteristic value). It is allowed to use a simulated load, but the on and off current values and the circuit time constant should be consistent with the actual load. During the test, when the battery pack voltage drops by less than 5% of the rated voltage, a fully charged battery pack should be replaced, and an external DC power supply is allowed.
When conducting the on-off capacity test, the output shaft of the tool is blocked in advance in the actual cold state and cannot be rotated. Operate the switch to connect and disconnect the tool's blocked current 50 times each (the tool has an average characteristic). The operating frequency, speed and holding time are the same as those in the switch durability test. It is allowed to use a simulated load, but the on and off current values and the circuit time constant should be consistent with the actual load. During the test, when the battery pack voltage drops by less than 5% of the rated voltage, a fully charged battery pack should be replaced. An external DC power supply is allowed. During the test, if the temperature of the switch is too high, it is allowed to continue the test after the switch cools down, but the continuous on and off operation cycles shall not be less than 3.
15.5 The battery used in the tool shall be a nickel-cadmium battery that complies with GB11013 or other rechargeable batteries with performance not inferior to it. 15.6 The plug-in matching dimensions between the terminals or contacts of the two poles of the battery pack led out of the tool or battery box and the charger shall be different from the dimensions specified in GB1002 and GB11919.
15.7 Compliance with the requirements of Articles 15.5 and 15.6 shall be checked by inspection and manual test, and if necessary, by tests in accordance with the provisions of GB11013. 15.8 The battery pack shall have sufficient overcharge capacity. After continuous charging for 24 hours at the charging current specified by the manufacturer or twice the charging time specified by the manufacturer (whichever is shorter), it shall still be able to power the tool normally and be repeatedly charged according to the manufacturer's regulations. Note: If the matching charger has an overcharge protection device and it operates during overcharge, it can be considered to meet the requirements of this article. 12
JB7787--1995
15.9 The following overcharge test is used to check whether it meets the requirements of Article 15.8: Use a matching charger that meets GB4706.18 to continuously charge the discharged battery pack at the charging current specified by the manufacturer. The charging time is 24 hours or twice the charging time corresponding to the charging current specified by the manufacturer (the shorter of the two). During the test, the ambient air temperature is maintained at 20±5℃.
Note: A discharged battery pack refers to a battery pack whose voltage has dropped to less than 83% of the rated value (that is, each battery has dropped to less than 1V). 15.10 Various protective devices (if any) in the tool should be non-automatic reset type. Compliance with this requirement is checked by observation and manual test. 16 Screws and Connectors
The screws and connectors of tools shall comply with the provisions of Chapter 26 "Screws and Connectors" of GB3883.1. Compliance with the requirements of this chapter shall be checked by observation, manual test and screw and nut tightening and loosening tests in accordance with the provisions of Chapter 26 of GB3883.1.
17 Creepage distance and electrical clearance
The creepage distance and electrical clearance between current-carrying parts without insulation layer of different polarities shall not be less than the minimum values specified in Table 1. Table 1
Working voltage
Note: The values specified in the table are not applicable to on-off switches. Compliance with the requirements of this article shall be checked by measuring with appropriate measuring tools. 18 Flame resistance
Creepage distance and electrical clearance
18.1 The plastic shell of the tool shall be able to withstand the 550℃ grade glow-wire test specified in Article 18.2; the insulating material parts in contact with the current-carrying parts shall be able to withstand the 650℃ grade glow-wire test. During the test, the sample should not burn or produce flames, or if there is burning or flames, they can be extinguished within 30 seconds after the glow wire is removed; the silk paper under the sample should not catch fire, and the pine board should not be charred. 18.2 Compliance with the requirements of Article 18.1 shall be checked by testing in accordance with the provisions of GB5169.4. The three most flammable parts of the casing (for example: near the commutator, switch contacts, electrical connectors, etc.) and the insulating parts in contact with the current-carrying parts shall be tested separately. The glow wire temperature is 550℃ and 650℃ respectively, and the application duration is 30±1s. Other requirements
Special requirements for various types of battery tools are specified by the corresponding product standards. 20 Test conditions
20.1 Unless otherwise specified in this standard, the test can be carried out at normal room temperature. 20.2 Unless otherwise specified in this standard: During the test: a) the tool and its movable parts shall be placed in the most unfavorable position that may occur in normal use; b) the adjustment and control devices (if any) that can change the setting point by the user shall be adjusted to the most unfavorable setting point; the electronic speed regulator shall be set to the highest speed position; c) the battery pack equipped with the tool itself shall be used, and the battery pack shall be fully charged according to the manufacturer's regulations before the test. 13
JB7787-1995
20.3 The rated voltage (average value) of the external DC test power supply shall be equal to the rated voltage of the tool. For the durability test in Article 9.2, the ripple factor of the power supply shall not exceed 8%. For the switching capacity and durability test of Article 15.4, the ripple factor of the power supply shall not be worse than the ripple factor of the three-phase bridge rectifier without filtering, and the ripple factor shall not be improved by capacitor or inductor filtering. The power supply circuit should have a suitable equivalent internal resistance so that the changes in voltage and current during the test are as close as possible to those when the actual battery pack is used. 20.4 For tools with built-in electronic circuits, the test conditions shall also comply with the provisions of Chapter B4 "General Precautions in Testing" in Appendix B of GB3883.1.
21 Inspection Rules
21.1 The test items listed in this standard are type test items specified for assessing the safety and reliability of the tools. The supplementary test items for various types of battery-powered tools shall be specified by the corresponding product standards of each type of tool. 21.2 Unless otherwise specified in the product standard, except for the components or special samples (such as on-off switches, battery boxes, etc.) that need to be provided separately for the test, the remaining tests shall be carried out on a sample in the delivery state, and the sample shall withstand all relevant tests. If one item fails, it is judged as unqualified; if the cause of the failure can be corrected quickly, it is allowed to retest the product manufactured after the cause of the failure is corrected, and all retests shall pass. 21.3 The type inspection items and sequence of tools are as follows:Marking inspection
Noise measurement
Radio and television interference measurement (only for products with this requirement)Withstand voltage test (only for products with this requirement)Durability test
Stuck rotor testwwW.bzxz.Net
Electronic device failure test (if there are electronic devices)Commutation test (if there are commutation devices)
Mechanical hazard inspection
Extrusion test
Impact test
Structural inspection||tt ||Internal wiring inspection
Switch test (switch samples can be provided separately if necessary)Battery box inspection and battery pack overcharge test (battery box or battery pack samples can be provided separately if necessary)Protection device inspection
Screw and connection parts inspection
Creep distance and electrical clearance inspection
Glow wire test (parts samples can be provided separately)20.4 Factory inspection items, sampling and evaluation are specified by the product standards of various types of battery tools, or agreed upon by the manufacturer and the user. Additional notes:
This standard is proposed and coordinated by the National Electric Tool Standardization Technical Committee. This standard was drafted by Shanghai Electric Tool Research Institute and Shanghai Hitachi Electric Tools Co., Ltd. Drafters of this standard Qian Naizhi and Lin Renzhang8 The battery pack should have sufficient overcharge capacity. After continuous charging for 24 hours or twice the charging time specified by the manufacturer (whichever is shorter) at the charging current specified by the manufacturer, it should still be able to supply power to the tool normally and be repeatedly charged as specified by the manufacturer. Note: If the matching charger has an overcharge protection device and it operates during overcharge, it can be considered to meet the requirements of this article. 12
JB7787--1995
15.9 The following overcharge test is used to check whether it meets the requirements of Article 15.8: Use a matching charger that complies with GB4706.18 to continuously charge the discharged battery pack at the charging current specified by the manufacturer for 24 hours or twice the charging time specified by the manufacturer corresponding to the charging current (whichever is shorter). During the test, the ambient air temperature is maintained at 20±5℃.
Note: A discharged battery pack refers to a battery pack whose voltage has dropped to less than 83% of the rated value (that is, each battery has dropped to less than 1V). 15.10 All types of protective devices in the tool (if any) shall be of non-automatic reset type. Compliance with this requirement shall be checked by observation and manual test. 16 Screws and connectors
The screws and connectors of the tool shall comply with the provisions of Chapter 26 "Screws and connectors" of GB3883.1. Compliance with this requirement shall be checked by observation, manual test and tightening and loosening tests of screws and nuts in accordance with the provisions of Chapter 26 of GB3883.1.
17 Creepage distance and electrical clearance
The creepage distance and electrical clearance between current-carrying parts without insulation layer of different polarity shall not be less than the minimum value specified in Table 1. Table 1
Working voltage
Note: The values specified in the table are not applicable to on-off switches. Compliance with this requirement is verified by measuring with appropriate measuring tools. 18 Flame resistance
Bottle distance, electrical space
18.1 The plastic shell of the tool shall be able to withstand the 550℃ grade glow-wire test specified in Article 18.2; the insulating material parts in contact with the current-carrying parts shall be able to withstand the 650℃ grade glow-wire test. During the test, the sample shall not burn or produce flames, or if there is burning or flames, it shall be extinguished within 30 seconds after the glow-wire is removed; the silk paper under the sample shall not catch fire, and the pine board shall not be charred. 18.2 Compliance with the requirements of Article 18.1 shall be verified by testing in accordance with the provisions of GB5169.4. Test the three most ignitable parts of the shell (for example: near the commutator, switch contacts, electrical connectors, etc.) and the insulating parts in contact with the current-carrying parts. The glow wire temperature is 550℃ and 650℃ respectively, and the application duration is 30±1s. Other requirements
Special requirements for various types of battery tools are specified by the corresponding product standards. 20 Test conditions
20.1 Unless otherwise specified in this standard, the test can be carried out under normal room temperature. 20.2 Unless otherwise specified in this standard: During the test: a) The tool and its movable parts are placed in the most unfavorable position that may occur in normal use; b) The adjustment and control devices (if any) that can change the setting point by the user are adjusted to the most unfavorable setting point; the electronic speed regulator is set to the highest speed position:
c) The battery pack equipped with the tool itself is used, and the battery pack should be fully charged according to the manufacturer's regulations before the test. 13
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20.3 The rated voltage (average value) of the external DC test power supply should be equal to the rated voltage of the tool. For the durability test in Article 9.2, the ripple factor of the power supply shall not exceed 8%. For the switch-on and switch-off capability and durability test in 15.4, the ripple factor of the power supply should not be worse than the ripple factor of the three-phase bridge rectifier without filtering, and the ripple factor should not be improved by capacitor or inductor filtering. The power supply circuit should have a suitable equivalent internal resistance so that the changes in voltage and current during the test are as close as possible to those when the actual battery pack is used. 20.4 For tools with built-in electronic circuits, the test conditions should also comply with the provisions of Chapter B4 "General Precautions in Testing" in Appendix B of GB3883.1.
21 Inspection Rules
21.1 The test items listed in this standard are type test items specified for assessing the safety and reliability of the tools. The supplementary test items for various types of battery tools shall be specified by the corresponding product standards of each type of tool. 21.2 Unless otherwise specified in the product standard, except for the components or special samples (such as on-off switches, battery boxes, etc.) that need to be provided separately for the test, the remaining tests shall be carried out on a sample in the delivery state, and the sample shall withstand all relevant tests. If one item fails, it is judged as unqualified; if the cause of the failure can be corrected quickly, it is allowed to retest the products manufactured after the cause of the failure is corrected, and all the retests should pass. 21.3 The type inspection items and sequence of tools are as follows: Marking inspection
Noise measurement
Radio and television interference measurement (only for products with this requirement)Withstand voltage test (only for products with this requirement)Durability test
Stuck rotor test
Electronic device failure test (if there are electronic devices)Commutation test (if there are commutation devices)
Mechanical hazard inspection
Extrusion test
Impact test
Structural inspection||tt ||Internal wiring inspection
Switch test (switch samples can be provided separately if necessary)Battery box inspection and battery pack overcharge test (battery box or battery pack samples can be provided separately if necessary)Protection device inspection
Screw and connection parts inspection
Creep distance and electrical clearance inspection
Glow wire test (parts samples can be provided separately)20.4 Factory inspection items, sampling and evaluation are specified by the product standards of various types of battery tools, or agreed upon by the manufacturer and the user. Additional notes:
This standard is proposed and coordinated by the National Electric Tool Standardization Technical Committee. This standard was drafted by Shanghai Electric Tool Research Institute and Shanghai Hitachi Electric Tools Co., Ltd. Drafters of this standard Qian Naizhi and Lin Renzhang8 The battery pack should have sufficient overcharge capacity. After continuous charging for 24 hours or twice the charging time specified by the manufacturer (whichever is shorter) at the charging current specified by the manufacturer, it should still be able to supply power to the tool normally and be repeatedly charged as specified by the manufacturer. Note: If the matching charger has an overcharge protection device and it operates during overcharge, it can be considered to meet the requirements of this article. 12
JB7787--1995
15.9 The following overcharge test is used to check whether it meets the requirements of Article 15.8: Use a matching charger that complies with GB4706.18 to continuously charge the discharged battery pack at the charging current specified by the manufacturer for 24 hours or twice the charging time specified by the manufacturer corresponding to the charging current (whichever is shorter). During the test, the ambient air temperature is maintained at 20±5℃.
Note: A discharged battery pack refers to a battery pack whose voltage has dropped to less than 83% of the rated value (that is, each battery has dropped to less than 1V). 15.10 All types of protective devices in the tool (if any) shall be of non-automatic reset type. Compliance with this requirement shall be checked by observation and manual test. 16 Screws and connectors
The screws and connectors of the tool shall comply with the provisions of Chapter 26 "Screws and connectors" of GB3883.1. Compliance with this requirement shall be checked by observation, manual test and tightening and loosening tests of screws and nuts in accordance with the provisions of Chapter 26 of GB3883.1.
17 Creepage distance and electrical clearance
The creepage distance and electrical clearance between current-carrying parts without insulation layer of different polarity shall not be less than the minimum value specified in Table 1. Table 1
Working voltage
Note: The values specified in the table are not applicable to on-off switches. Compliance with this requirement is verified by measuring with appropriate measuring tools. 18 Flame resistance
Bottle distance, electrical space
18.1 The plastic shell of the tool shall be able to withstand the 550℃ grade glow-wire test specified in Article 18.2; the insulating material parts in contact with the current-carrying parts shall be able to withstand the 650℃ grade glow-wire test. During the test, the sample shall not burn or produce flames, or if there is burning or flames, it shall be extinguished within 30 seconds after the glow-wire is removed; the silk paper under the sample shall not catch fire, and the pine board shall not be charred. 18.2 Compliance with the requirements of Article 18.1 shall be verified by testing in accordance with the provisions of GB5169.4. Test the three most ignitable parts of the shell (for example: near the commutator, switch contacts, electrical connectors, etc.) and the insulating parts in contact with the current-carrying parts. The glow wire temperature is 550℃ and 650℃ respectively, and the application duration is 30±1s. Other requirements
Special requirements for various types of battery tools are specified by the corresponding product standards. 20 Test conditions
20.1 Unless otherwise specified in this standard, the test can be carried out under normal room temperature. 20.2 Unless otherwise specified in this standard: During the test: a) The tool and its movable parts are placed in the most unfavorable position that may occur in normal use; b) The adjustment and control devices (if any) that can change the setting point by the user are adjusted to the most unfavorable setting point; the electronic speed regulator is set to the highest speed position:
c) The battery pack equipped with the tool itself is used, and the battery pack should be fully charged according to the manufacturer's regulations before the test. 13
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20.3 The rated voltage (average value) of the external DC test power supply should be equal to the rated voltage of the tool. For the durability test in Article 9.2, the ripple factor of the power supply shall not exceed 8%. For the switch-on and switch-off capability and durability test in 15.4, the ripple factor of the power supply should not be worse than the ripple factor of the three-phase bridge rectifier without filtering, and the ripple factor should not be improved by capacitor or inductor filtering. The power supply circuit should have a suitable equivalent internal resistance so that the changes in voltage and current during the test are as close as possible to those when the actual battery pack is used. 20.4 For tools with built-in electronic circuits, the test conditions should also comply with the provisions of Chapter B4 "General Precautions in Testing" in Appendix B of GB3883.1.
21 Inspection Rules
21.1 The test items listed in this standard are type test items specified for assessing the safety and reliability of the tools. The supplementary test items for various types of battery tools shall be specified by the corresponding product standards of each type of tool. 21.2 Unless otherwise specified in the product standard, except for the components or special samples (such as on-off switches, battery boxes, etc.) that need to be provided separately for the test, the remaining tests shall be carried out on a sample in the delivery state, and the sample shall withstand all relevant tests. If one item fails, it is judged as unqualified; if the cause of the failure can be corrected quickly, it is allowed to retest the products manufactured after the cause of the failure is corrected, and all the retests should pass. 21.3 The type inspection items and sequence of tools are as follows: Marking inspection
Noise measurement
Radio and television interference measurement (only for products with this requirement)Withstand voltage test (only for products with this requirement)Durability test
Stuck rotor test
Electronic device failure test (if there are electronic devices)Commutation test (if there are commutation devices)
Mechanical hazard inspection
Extrusion test
Impact test
Structural inspection||tt ||Internal wiring inspection
Switch test (switch samples can be provided separately if necessary)Battery box inspection and battery pack overcharge test (battery box or battery pack samples can be provided separately if necessary)Protection device inspection
Screw and connection parts inspection
Creep distance and electrical clearance inspection
Glow wire test (parts samples can be provided separately)20.4 Factory inspection items, sampling and evaluation are specified by the product standards of various types of battery tools, or agreed upon by the manufacturer and the user. Additional notes:
This standard is proposed and coordinated by the National Electric Tool Standardization Technical Committee. This standard was drafted by Shanghai Electric Tool Research Institute and Shanghai Hitachi Electric Tools Co., Ltd. Drafters of this standard Qian Naizhi and Lin Renzhang2 Unless otherwise specified in this standard: During the test: a) the tool and its movable parts shall be placed in the most unfavorable position that may occur in normal use; b) the adjustment and control devices (if any) that can change the setting point by the user shall be adjusted to the most unfavorable setting point; the electronic speed regulator shall be set to the highest speed position; c) the battery pack equipped with the tool itself shall be used, and the battery pack shall be fully charged according to the manufacturer's regulations before the test. 13
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20.3 The rated voltage (average value) of the external DC test power supply shall be equal to the rated voltage of the tool. For the durability test in Article 9.2, the ripple factor of the power supply shall not exceed 8%. For the switching capacity and durability test of Article 15.4, the ripple factor of the power supply shall not be worse than the ripple factor of the three-phase bridge rectifier without filtering, and the ripple factor shall not be improved by capacitor or inductor filtering. The power supply circuit should have a suitable equivalent internal resistance so that the changes in voltage and current during the test are as close as possible to those when the actual battery pack is used. 20.4 For tools with built-in electronic circuits, the test conditions shall also comply with the provisions of Chapter B4 "General Precautions in Testing" in Appendix B of GB3883.1.
21 Inspection Rules
21.1 The test items listed in this standard are type test items specified for assessing the safety and reliability of the tools. The supplementary test items for various types of battery-powered tools shall be specified by the corresponding product standards of each type of tool. 21.2 Unless otherwise specified in the product standard, except for the components or special samples (such as on-off switches, battery boxes, etc.) that need to be provided separately for the test, the remaining tests shall be carried out on a sample in the delivery state, and the sample shall withstand all relevant tests. If one item fails, it is judged as unqualified; if the cause of the failure can be corrected quickly, it is allowed to retest the product manufactured after the cause of the failure is corrected, and all retests shall pass. 21.3 The type inspection items and sequence of tools are as follows:Marking inspection
Noise measurement
Radio and television interference measurement (only for products with this requirement)Withstand voltage test (only for products with this requirement)Durability test
Stuck rotor test
Electronic device failure test (if there are electronic devices)Commutation test (if there are commutation devices)
Mechanical hazard inspection
Extrusion test
Impact test
Structural inspection||tt ||Internal wiring inspection
Switch test (switch samples can be provided separately if necessary)Battery box inspection and battery pack overcharge test (battery box or battery pack samples can be provided separately if necessary)Protection device inspection
Screw and connection parts inspection
Creep distance and electrical clearance inspection
Glow wire test (parts samples can be provided separately)20.4 Factory inspection items, sampling and evaluation are specified by the product standards of various types of battery tools, or agreed upon by the manufacturer and the user. Additional notes:
This standard is proposed and coordinated by the National Electric Tool Standardization Technical Committee. This standard was drafted by Shanghai Electric Tool Research Institute and Shanghai Hitachi Electric Tools Co., Ltd. Drafters of this standard Qian Naizhi and Lin Renzhang2 Unless otherwise specified in this standard: During the test: a) the tool and its movable parts shall be placed in the most unfavorable position that may occur in normal use; b) the adjustment and control devices (if any) that can change the setting point by the user shall be adjusted to the most unfavorable setting point; the electronic speed regulator shall be set to the highest speed position; c) the battery pack equipped with the tool itself shall be used, and the battery pack shall be fully charged according to the manufacturer's regulations before the test. 13
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20.3 The rated voltage (average value) of the external DC test power supply shall be equal to the rated voltage of the tool. For the durability test in Article 9.2, the ripple factor of the power supply shall not exceed 8%. For the switch-on and off capacity and durability test in Article 15.4, the ripple factor of the power supply shall not be worse than the ripple factor of the three-phase bridge rectifier without filtering, and the ripple factor shall not be improved by capacitor or inductor filtering. The power supply circuit should have a suitable equivalent internal resistance so that the changes in voltage and current during the test are as close as possible to those when the actual battery pack is used. 20.4 For tools with built-in electronic circuits, the test conditions shall also comply with the provisions of Chapter B4 "General Precautions in Testing" in Appendix B of GB3883.1.
21 Inspection Rules
21.1 The test items listed in this standard are type test items specified for assessing the safety and reliability of the tools. The supplementary test items for various types of battery-powered tools shall be specified by the corresponding product standards of each type of tool. 21.2 Unless otherwise specified in the product standard, except for the components or special samples (such as on-off switches, battery boxes, etc.) that need to be provided separately for the test, the remaining tests shall be carried out on a sample in the delivery state, and the sample shall withstand all relevant tests. If one item fails, it is judged as unqualified; if the cause of the failure can be corrected quickly, it is allowed to retest the product manufactured after the cause of the failure is corrected, and all retests shall pass. 21.3 The type inspection items and sequence of tools are as follows:Marking inspection
Noise measurement
Radio and television interference measurement (only for products with this requirement)Withstand voltage test (only for products with this requirement)Durability test
Stuck rotor test
Electronic device failure test (if there are electronic devices)Commutation test (if there are commutation devices)
Mechanical hazard inspection
Extrusion test
Impact test
Structural inspection||tt ||Internal wiring inspection
Switch test (switch samples can be provided separately if necessary)Battery box inspection and battery pack overcharge test (battery box or battery pack samples can be provided separately if necessary)Protection device inspection
Screw and connection parts inspection
Creep distance and electrical clearance inspection
Glow wire test (parts samples can be provided separately)20.4 Factory inspection items, sampling and evaluation are specified by the product standards of various types of battery tools, or agreed upon by the manufacturer and the user. Additional notes:
This standard is proposed and coordinated by the National Electric Tool Standardization Technical Committee. This standard was drafted by Shanghai Electric Tool Research Institute and Shanghai Hitachi Electric Tools Co., Ltd. Drafters of this standard Qian Naizhi and Lin Renzhang
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