This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking and packaging of electric circular saws. This standard applies to AC/DC dual-purpose, single-phase series-excited electric circular saws (hereinafter referred to as electric circular saws) for sawing wood, fiberboard, plastic and flexible cables, and similar materials under normal environmental conditions. JB/T 7838-1999 Electric Circular Saw JB/T7838-1999 Standard download decompression password: www.bzxz.net

JB/T7838—1999
This standard is a revision of JB/T7838—1995 Electric Circular Saws. This standard complies with GB3883.5—1998 Safety of Handheld Electric Tools Part 2
(idtIEC60745—2—5:1993).
This standard adds 4.5.2, 4.5.3, 5.4, 5.5, and modifies 2 and 8.1. Special requirements for circular saws and circular knives
This standard is based on the abbreviation of GB/T1.1—1993 Guidelines for Standardization Unit 1: Rules for the beginning and expression of standards.
This standard replaces JB/T7838—1995 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Electric Tools. This standard is drafted by Shanghai Electric Tool Research Institute. The main drafters of this standard are Liu Jianxin and Zheng Kaiji. This standard was first formulated in 1988 and revised for the first time in 1994. Part 1: Standards
1 Scope
Machinery Industry Standard of the People's Republic of China
Electric Circular Saws
Electric Saws
JB/T7838—1999
Replacement JB/T7838—1995
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking and packaging of electric circular saws. This standard applies to AC/DC dual-purpose, single-phase induced electric circular saws (hereinafter referred to as electric circular saws) for sawing wood, fiberboard, plastic and flexible cables, and similar materials under normal environmental conditions. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T755—1987
GB 2099.1—1996
GB 3883. 5—1995
GB 4343—1995
GB/T'4583—1995
GB 5013.4—1997
7
GB/T9088—1988
GB 17625.1—1998
GB 17625.2—1999
3 Basic parameters and types
Basic technical requirements for rotating electrical machines
Plugs and sockets for household and similar purposes Part 1: General requirements (eqvIEC60884:1994) Safety of hand-held electric tools Part 2 Particular requirements for circular saws and circular saws (idt·IEC 60745—2-5.1993)
Measuring methods and allowable values ​​of radio interference characteristics of electric and heating appliances, electric tools and similar electrical appliances for household and similar purposes (eqvC.ISPRNO.14:1993) Engineering method for measuring noise of electric tools
Rubber insulated flexible cables with rated voltages of 450/750V and below, Part 4: Cables and flexible electrodes
(idt IEC60245,1994)
Polyvinyl chloride insulated cords with rated voltage of 450/750V and below Part 5: Flexible wires (idtIEC602271993)
Model compilation method for electric tools
Limits of harmonic currents emitted by low-voltage electrical and electronic equipment (input current per phase of the equipment ≤16A) (idtIEC61000-3-2:1995)
Electromagnetic compatibility Limits of voltage fluctuations and flicker generated in low-voltage power supply systems by equipment with rated current not exceeding 16A (idtIEC61000--3--3:1994)3.1 The basic parameters of electric circular saws shall comply with the provisions of Table 1. Approved by the State Bureau of Machinery Industry on August 6, 1999, and implemented on January 1, 2000. 16Q×30 180×30 200×30 250×30 315×30 Rated output power ≥450 ≥560 ≥710 JB/T7838-1999 Table 1 Basic parameters Rated torque Note: The specifications in the table refer to the maximum outer diameter of the saw blade that can be used. The model of the electric circular saw should comply with the provisions of GB/T9088, and its meaning is as follows: M 1 YO O-
Maximum aluminum depth
≥105
Outer diameter of saw blade in meter, expressed in Arabic numerals (specification code)
Design serial number
Design unit code
Electric saw (product code)
Power source category code used by power saw
Forestry category (major category code)
4 Technical requirements
4.1 General requirements
4.1.1 Electric circular saws shall be manufactured according to drawings and technical documents approved by the prescribed procedures and comply with the provisions of this standard. 4.1.2 Electric circular saws shall be able to operate at rated speed under the following environmental conditions: a) Altitude not exceeding 1000m:
b) Ambient air temperature not exceeding 40℃:
c) Relative air humidity not exceeding 90% (25C). 4.1.3 The power supply conditions applicable to electric saws are: Maximum adjustment angle
a) AC/DC dual-purpose electric circular saws should be able to operate at rated speed under DC and single-phase AC power supply with actual sine waveform and rated frequency;
b) Single-phase AC saws should be able to operate at rated speed under single-phase AC power supply with actual sine waveform and rated frequency. 4.1.4 Rated voltage and rated frequency are:
a) AC rated voltage: 220, 42, 36V; b) DC rated voltage: 220V;
c) AC rated frequency: 50Hz,
4.2 Safety of electric circular saws
4.2.1 The safety of electric circular saws shall comply with the provisions of GB3883.5, except for the provisions supplemented and enhanced by this standard. 4.2.2 Protective cover of electric circular saws.
On the top of the saw blade, a fixed guard should be used to effectively prevent the periphery of the saw blade from being touched from the back and sides of the circular saw. Due to the need of use, the passage left in front of the circular saw to touch the periphery cannot allow the cylindrical surface of a cylindrical test probe with a diameter of 13mm and a length of 50mm to touch the periphery of the saw blade.
Under the bottom plate, the periphery of the saw blade should be covered with a movable guard. When the guard is in the closed position, the angle formed by the intersection of the circumference of the guard shell and the plane of the bottom plate and the front edge of the guard against the rotation axis should not exceed 10°. 4.2.3 The plug of Class I electric circular saws shall be integrated with the power cord, and its insulation shall be able to withstand a withstand voltage test of 3750V in the form of a real sine wave, a frequency of 50Hz, and a voltage value of 1min without breakdown or surface flashover. 4.2.4 The power switch installed on the electric circular saw shall be an automatic reset switch without a locking device, that is, when the operating member of the switch is released, the motor can be automatically powered off immediately. For multi-purpose tools that can be equipped with electric wire saw accessories, the installed power switch is allowed to be an automatic reset and shutdown with a locking device.
The electric circular saw shall have two mechanisms for adjusting the cutting depth and the sawing angle. Both of these adjustment mechanisms shall not become loose during normal use of the tool. 4.2.6 The flexible cable or cord connecting the electric wire to the power supply shall comply with the provisions of GB5013.4 or GB5023.5, or a flexible cable or cord with equivalent performance shall be used.
4.3 Appearance quality of electric circular saws|| tt||The outer shell of the circular saw shall have no obvious defects, and the coating shall not peel or flake off. The nameplate of the circular saw shall be firmly placed on the shell without curling. 4.4 Sound
The average value of the no-load noise sound pressure level (A-weighted) of the circular saw measured at a spherical surface 1000mm away from the center of the circular saw shall not exceed the allowable value specified in Table 2.
Table 2 Allowable noise value
Specifications of circular saws
Acoustic value dB(A)
92(1 02)
94(104)
Note: When measuring the sound value of electric saw media in the reverberation room, its sound power level (A-weighted) shall not exceed the allowable value specified in the brackets in the table. 4.5 Electromagnetic compatibility
4.5.1 Radio and television interference level
a) The continuous interference voltage level value of the phase line or neutral line to the ground measured in the frequency range of 0.15~30MHz shall not exceed the allowable value specified in Table 3.
0. 15~0. 35
>0. 35~5.00
>5. 00~ 30. 00
Interference voltage
dB(V)
decreases linearly with the logarithm of the frequency
b) The continuous interference power level value measured by the power line radiation and the absorption clamp within the frequency range of 30~300MHz shall not exceed the allowable value specified in Table 4.
30~300
4.5.2 Harmonic power supply
a) The steady-state harmonic current of the electric circular saw shall not exceed the limit value specified in Table 5. 96
Interference power
dB(PW)Www.bzxZ.net
Increases linearly with frequency45 to 55
Odd-order spectrum
Even harmonics
JB/T7838—1999
Table 5 Steady-state harmonic current limit
Normal number
15≤n≤39
Maximum allowable harmonic current
0.225×15/n
0.345×8/n
b) For 2~10th even-order spectrum and 3~19th odd-order spectrum, within any 2.5min observation period, the transient harmonic current value allowed not exceeding 15s is 1.5 times the steady-state harmonic current limit specified in Table 5. 4.5.3 Voltage fluctuation and flicker
When the circular saw is connected to the low-voltage power grid, the voltage fluctuation and flicker caused by it shall meet the following requirements: P value shall not be greater than 1.0;
P value shall not be greater than 0.65;
The steady-state relative voltage change d. shall not exceed 3%; the maximum relative voltage change dmx shall not exceed 4%; the voltage change characteristic value d(t) shall not exceed 3% in 300ms. If the voltage change is caused by a manual switch or the occurrence rate is less than once per hour, P. and P. shall not be assessed. The steady-state relative voltage change d., the maximum relative voltage change dux, and the voltage change characteristic value d(t) shall be multiplied by a coefficient of 1.33. 4.6 Radial runout of the cylindrical surface of the shaft extension
The radial runout of the cylindrical surface of the shaft extension of the circular saw shall not be greater than 0.04mm. 4.7 Commutation Sparks
The sparks of the circular saw under rated voltage, no-load and load should not exceed Level 2 specified in GB/T755-1987. 4.8 Input Power and Current
4.8.1 The input power of the circular saw under rated voltage and rated load should not exceed 120% of the input power value indicated on the nameplate. 4.8.2 If the nameplate of the circular saw has a current value, the current should not exceed 120% of the current value indicated on the nameplate under rated voltage and rated load.
4.9 Overflow
At rated load, the temperature rise of the circular saw should not exceed the value specified in Table 6. 97
E-class insulated winding
B-class insulated sintered group
F-class insulated sintered group
Casing not held during normal use
Handles, buttons and similar parts held continuously during normal use: metal
JB/T7838—1999
General rise limit
Note: When the altitude of the test site or the point of use is different from the specified environmental conditions, the reference rise limit of the environmental group shall be based on the provisions of GB/T755 for 4.10 over-torque test
The electric circular saw shall be able to operate normally after an over-torque test of 1.5 times the rated torque for 15s in hot state. 4.11 Clamping plate for circular saw blades
The clamping plate dimensions of circular saw blades for electric circular saws (see Figure 1) shall comply with the values ​​specified in Table 7. One clamping plate shall be fixed to the output shaft by a key or pin.
Clamping plate dimensions
Outer diameter of circular saw blade
4.12 Length of power cord
Clamping plate dimensions
30-8sa
30-& s*
The length of the power cord of the electric saw from the power cord inlet to the plug (excluding the pins) shall be not less than 2.5m. H
4.13 Anti-induction
The steel springs and screws in the electric circular saw shall be surface treated to prevent rust. Anti-induction tests shall be carried out on steel springs and grounding nails and washers.
Test method
5.1 Appearance inspection
The appearance quality of the electric circular saw shall be inspected by observation and manual test. 98
JB/T 7838—1999
The inspection results shall comply with the provisions of 4.2.4, 4.2.5 and 4.3. 5.2 Noise test
The noise test of electric circular saw shall be carried out in accordance with the provisions of GB/T4583. The test results shall comply with the provisions of 4.4.
5.3 Measurement of radio and television interference level The radio and television interference level of electric circular saw shall be measured in accordance with the provisions of GB4343. During the measurement, the electric circular saw shall run continuously without load with the saw blade.
The test results shall comply with the provisions of 4.5.1.
5.4 Spectral current measurement
The harmonic current measurement of the electric circular saw shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the electric circular saw shall be continuously operated without load with the aluminum sheet. The measurement results shall comply with the provisions of 4.5.2.
5.5 Voltage fluctuation and flicker measurement
The voltage fluctuation and flash measurement of the electric four-wire saw shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the electric circular saw shall be continuously operated without load with the saw blade. The measurement results shall comply with the provisions of 4.5.3.
5.6 Radial runout inspection of the cylindrical surface of the shaft extension
The electric circular saw is fixed on a rigid bracket, and the measurement is taken with a dial indicator, and the measuring point is the middle position of the cylindrical surface of the shaft extension. The electric circular saw is used to rotate the shaft slowly for three circles at a low voltage or in other appropriate ways. The average value of the difference between the three maximum and minimum values ​​on the dial gauge is the radial runout value of the four cylindrical surfaces of the shaft. The inspection result should comply with the provisions of 4.6.
5.7 Commutation spark inspection
The electric saw is run at no load for 15 minutes at rated voltage. When no load and in the test of 5.9, observe the spark under voltage. During the inspection test, only the commutation spark is checked at no load. The inspection result should comply with the provisions of 4.7.
5.8 Input power, current and working parameter measurement The electric circular saw is operated at rated voltage, so that the applied torque reaches the minimum value of the rated torque specified in Table 1. If the output power has not reached the minimum value of the rated output power specified in Table 1 at this time, continue to increase the load of the electric face saw until the output power of the electric circular saw reaches this value (when the specified rated output power and rated torque are greater than the minimum value specified in Table 1, use the same method to load according to the specified rated output power or rated torque).
After the circular saw has been running for 15 minutes, measure the input power, current, torque and output power of the circular saw. For Class I circular saws, care should be taken to keep the voltage at the plug of the circular saw at the rated voltage value during measurement, and the line loss between the plug and the power meter should be deducted from the input power.
The inspection results should comply with the provisions of 3.1 and 4.8. 5.9 Temperature rise test
5.9.1 Applied load
Apply torque according to the load determined in 5.8 at the rated voltage. If the input power of the circular saw is less than the rated input power indicated on the nameplate, increase the load so that the input power of the circular saw reaches the rated input power indicated on the nameplate, and apply the load with the torque under the input power to conduct the temperature rise test.
5.9.2 Running time
Run continuously under the conditions of 5.9.1 until the temperature rise of each part of the circular saw reaches the actual stable state. 5.9.3 Method of temperature rise measurement
After the temperature rise of each part of the electric saw reaches the actual stability, the temperature rise of the winding is measured by the resistance method, and the temperature rise of other parts is measured by the thermometer method. The test results shall comply with the provisions of 4.9.
5.10 Overtorque test
JB/T 78381999
When the temperature rise of the electric saw reaches the stable state, increase the torque at the rated voltage so that its output torque reaches 1.5 times the load torque measured in 5.8.
The test lasts for 15s
The test results shall comply with the provisions of 4.10.
5.11 Inspection of protective cover
The test probe and the electric saw are in the position shown in Figure 2. At this time, the test probe should be close to the front end of the electric saw, and then the test probe is moved left and right along its own axis, and the push inspection is performed respectively according to the push direction of the needle shown in the figure. Central probe
Needle advancement direction
When the movable guard of the electric circular saw is in the closed position (as shown in Figure 3), use a special angle measuring plate (this angle measuring plate should be triangular, and its acute angle is 10°) to measure the strong angle formed by the intersection of the circular saw's circulating guard shell circumference line and the bottom plate plane and the front edge of the guard to the rotation axis.
The inspection and measurement results should comply with the provisions of 4.2.2. Enclosing guard
Moveable guard in the cumulative position
tt||5.12 Inspection of sawing depth and angle
5.12.1 Inspection of sawing depth
Set the sawing angle of the electric saw to the "zero" position and adjust the sawing depth to the maximum position. At this time, turn the movable protective cover of the electric circular saw into the fixed protective cover and use a steel ruler to measure the vertical distance from the lower plane of the bottom plate of the electric circular saw to the periphery of the saw blade. The inspection result shall comply with the provisions of Table 1.
5.12.2 Inspection of sawing angle
JB/T 7838—1999
Release the angle adjustment nut of the electric saw, turn the bottom plate of the electric circular saw to the maximum angle, and use an angle ruler to measure the aluminum cutting angle of the electric circular saw at this position.
The inspection result shall comply with the provisions of Table 1.
5.13 Inspection of saw blade clamping plate
Measure the dimensions of the saw blade clamping plate specified in 4.11 by observation and with a vernier caliper. The inspection result shall comply with the provisions of 4.11.
5.14 Voltage withstand test for Class II electric saw plugs Attach a metal box to the handle on the outer surface of the plug body, and then apply a 3750V test voltage between the plug pins and the metal foil for 1 minute.
The test results should comply with the provisions of 4.2.3.
5.15 Power cord length measurement
Measure the length of the power cord from the power cord inlet of the electric circular saw to the plug (excluding the pins). The measurement results should comply with the provisions of 4.12.
5.16 Other test methods
Other test methods not specified in this standard shall be carried out in accordance with the corresponding provisions of GB3883.5. 6 Inspection rules
6.1 Each electric saw must be inspected and qualified by the quality management department before it can leave the factory. Documents proving the quality of the product should be attached when leaving the factory. 6.2 The items specified in this standard are type test items. Among them, items marked with "*\" are inspection test items. Items marked with \**\ may not be carried out in subsequent type tests if the structure and materials have not changed after the product is finalized. Appearance inspection*
Marking inspection* (mark wiping test is not required during inspection test)Electric shock protection inspection**
Noise test
Radio and TV interference level measurement
Harmonic current measurement
Voltage fluctuation and flicker measurement
Starting test
Shaft extension cylindrical surface radial runout inspection||tt| |Commutation spark inspection*
Input power, current and working parameter measurementTemperature rise test
Overtorque test
Leakage current measurement
Moisture proof test
Insulation resistance measurement
Withstand voltage test* (Moisture proof test may not be performed first during inspection test, and the test voltage and time may be different from those during type test)Durability test
Abnormal operation test
Mechanical hazard inspection%
Mechanical strength inspection (excluding impact test)Grounding device inspection
Protective cover inspection**
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