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JB/T7839—1999
This standard is a revision of JB/T7839-1995 "Impact Drill". This standard complies with GB3883.6-1991 (Safety of Handheld Power Tools Part 2: Special Requirements for Electric Drills) (idtIEC60745-21:1989).
This standard adds 4.7.2, 4.7.3, 5.5, 5.6, and modifies 2 and 8.1. This standard is compiled based on GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presentation of Standards Part 1: Basic Regulations for the Compilation of Standards".||tt ||This standard replaces JB/T7839-1995 from the date of implementation. This standard is proposed and managed by the National Electric Tool Standardization Technical Committee. The drafting unit of this standard: Shanghai Electric Tool Research Institute. The main drafter of this standard is Wang Jiaruo.
This standard was first formulated in 1988 and revised for the first time in 1994. 104
1 Scope
Mechanical Industry Standard of the People's Republic of China
Impact Drill
Impact drills
JB/T 78391999
Replaces JB/T7839-1995
This standard specifies the basic parameters, types, technical requirements, test methods, inspection rules and other requirements of impact drills. This standard applies to AC/DC dual-purpose impact drills and single-phase series-excited impact drills (hereinafter referred to as impact drills) used for drilling holes in masonry, lightweight concrete, ceramics, metals and similar materials under normal environmental conditions. This standard does not apply to electric drills and hole-type impact drills. This standard also does not apply to electronically modulated impact drills and battery-powered impact drills. 2 Reference 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. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 755-1987
GB 2099. 1-1996
GB 3883.6—1991
GB/T 4583—1995
GB 5013. 4—1997
GB 5023.5—1997
GB/T 9088--1988
GB17625.1—1 998
GB 17625. 2-1999
3 Basic parameters and types
Basic technical requirements for power-converting motors
Plugs and sockets for household and similar purposes Part 1: General requirements (egvIEC60884:1994)Safety of hand-held electric tools Part 2 Particular requirements for electric drills (idtIEC60745-2-1:1989)
Methods of measurement 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.14t1993)Engineering method for measuring noise of electric tools
Part 4: Soft cords and flexible cables
Rubber insulated flexible cables with rated voltage of 450/750V or less Cables (idtIEC60245:1994)
Part 5; Flexible wires (flexible cords)
Vinyl chloride insulated cables with rated voltage of 450/750V and below (idtIEC60227;1993)
Model reduction method for electric tools
Limits of harmonic current emitted by low-voltage electrical and electronic equipment (input current per phase of 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 impulse current estimation shall comply with the provisions of Table 1. Approved by the State Bureau of Machinery Industry in 199908-06 and implemented in 2000--01-01
Specifications of impact drills
Rated output power
Rated torque
Rated number of impacts
≥17600
JB/T78391999
Basic parameters
Specifications of impact drills refer to the maximum drilling diameter when processing materials such as masonry, lightweight concrete, etc. For double-impact drills, the basic parameters in the table refer to the parameters at low speed. 3.2 The models of impact drills comply with the provisions of GB/T9088, and their meanings are as follows: z
4 Technical requirements
General requirements
The drill diameter in meters is expressed in Arabic numerals. (Specification code)
Design serial number
Design unit code
Impact drill (product code)
Power supply used by impact drill (category code) Construction category (major category code)
4.1.1 Impact drills shall be manufactured according to the approved samples and technical documents in the prescribed procedures and comply with the provisions of this standard. 4.1.2 Impact drills shall be able to operate at rated speed under the following environmental conditions: a) The sea throw shall not exceed 1000m;
b) The ambient air temperature shall not exceed 40℃;
c) The relative humidity of the air shall not exceed 90% (25℃). 4.1.3 Impact drills are suitable for the following power supply conditions: 20
≥280
4.1.3.1 AC/DC dual-purpose impact drills shall be able to operate at rated speed under single-phase AC power supply with DC and power supply voltage being actual sinusoidal waveform and frequency of 50Hz.
4.1.3.2 Single-phase series-excited impact drills should be able to operate at rated voltage under a single-phase AC power supply with a power supply voltage of actual sinusoidal waveform and a rated frequency of 50Hz.
4.1.4 Rated voltage:
a) AC rated voltage: 220, 42, 36Vb) DC rated voltage: 220V.
4.2 Safety requirements
4.2.1 Safety requirements for impact drills, except for the provisions that must be met and supplemented and improved by this standard, the rest shall comply with the relevant provisions in GB3883.6.
JB/T7839—1999
4.2.2 The performance of the impact drill plug shall comply with the provisions of GB2099.1. The plug of a Class 1 impact drill shall be made integral with its power cord. Its insulation shall be able to withstand a voltage withstand test of 3750V with a waveform of an actual sine wave, a frequency of 50Hz, and a voltage value of 3750V for 1 minute, and no breakdown or surface internal wiring shall occur. 4.2.3 The cable or cord connecting the impact drill to the power supply shall comply with the provisions of GB5013.4 or GB5023.5, or a soft cable or cord with performance not lower than them shall be used.
4.3 Appearance quality
4.3.1 The plastic shell of the impact drill shall not have serious defects such as bubbles, cracks, obvious shed spots and cold insulation. The surface of the metal shell shall be free of defects, and the coating shall be evenly hooked and smooth.
4.3.2 The nameplate of the impact drill shall be firmly placed on the surface of the impact drill shell without curling. 4.4 Drill shaft of impact drill
4.4.1 Threaded drill shaft of impact drill
The circular runout of the cylindrical end face of the drill shaft of impact drill after threading shall not exceed 0.04mm. 4.4.2 Threaded drill shaft of impact drill
4.4.2.1 The effective working length of the cone surface of the drill shaft of impact drill shall not be less than 65%. The radial runout of the outer shell surface of the drill shaft of impact drill shall not exceed 0.04mm. 4. 4.2.2
Initial starting current
The initial starting current of impact drill shall not exceed the rated current value. 4.6 Noise
The average value of the no-load noise sound pressure level (A-weighted) of impact drill measured at the spherical surface 1000mm away from the center of impact drill shall not exceed the allowable value specified in Table 2.
84(94)
Noise allowable value
86(96)
Note: When measuring the sound value of the impact drill in the sound observation room, its sound power level (A weighted) should not be greater than the allowable value specified in the brackets in the table. 4.7 Electromagnetic compatibility
4.7.1 Radio and television interference level
a) The continuous interference voltage level of the phase 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.
Table 3 Continuous interference voltage allowable value
D.15~0.35
>0. 35~5.00
>5. 00~30.00
Interference voltage
dB(μV)
decreases linearly with the logarithm of frequency
b) The continuous interference power level value absorbed by the power line radiation and absorption clamp measured in the frequency range of 30~300MHz shall not exceed the allowable value specified in Table 4.
Continuous interference power allowable value
30~300
Interference power
dB(PW)
The limit value increases linearly from 45 to 55
4.7.2 Spectral current
JB/T7839—1999
a) The steady-state harmonic current of the impact drill shall not exceed the limit specified in Table 5; Table 5 Steady-state harmonic current limit
Spectrum Number
odd harmonics
15≤39
maximum allowable spectrum current
0.225×15/n
0.345×8/n
b) For 2nd to 10th odd harmonics and 3rd to 19th odd harmonics, within any 2.5min observation period, the transient spectrum current value allowed not exceeding 15s is 1.5 times the steady-state harmonic current limit specified in Table 5. 4.7.3 Voltage fluctuation and flicker
When the impact drill is connected to the low-voltage power grid, the voltage fluctuation value and flicker value caused by it shall comply with the following provisions: 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 d 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 frequency of occurrence is less than once per hour, P and Pu shall not be assessed. The steady-state relative voltage change value d, the maximum relative voltage change dx, and the voltage change characteristic value d(t) shall be multiplied by a coefficient of 1.33. 4.8 Commutation spark
When the impact drill is no-load and rated load at rated voltage, the spark under the voltage control shall not be greater than Level 2 specified in GB/T755-1987. 4.9 Input power and current
The measured input power value of the impact drill at rated voltage and rated load shall not exceed 4.9.1
120% of the input power value indicated on the nameplate.
4.9.2 If the impact drill nameplate has a current value, the measured current value at rated voltage and rated load shall not exceed 120% of the current value indicated on the nameplate.
4.10 Temperature rise
When the impact drill is at rated load, the temperature rise of the impact drill shall not exceed the limit specified in Table 6. 108
E-level insulation burner
B-level insulation winding
F-level continuous winding
Non-handled external light in normal use
Handles, buttons and similar parts that are continuously held in normal use: metal
JB/T7839—1999
Temperature rise limit
Previous; When the test location or the use location is different from the specified environmental conditions, the correction of the temperature rise limit of the mirror group shall be carried out in accordance with the provisions of GB/T755, 4.11 Over-torque
After the impact drill is subjected to the over-torque test specified in 5.10 in the hot state, it should still be able to operate normally at the rated voltage, 4.12 Locked rotor
After the impact drill is subjected to the locked rotor test specified in 5.11 in the actual cold state, it should still be able to run with positive belt at the rated voltage. 4.13 Length of power cord
The length of the flexible cable or cord from the cable entry hole to the plug (excluding the pins) should be not less than 2.5m. 4.14 Rust prevention
The steel brush springs and screws of the impact drill should be surface treated to prevent rust. The steel brush springs and grounding screws and washers should also be able to withstand the rust prevention test.
5 Test method
5.1 Appearance inspection
The appearance quality of the impact drill should be inspected by observation and manual test. The inspection results should comply with the provisions of 4.3.
5.2 Inspection of the drill shaft of the impact drill
5.2.1 Inspection of the cylindrical end face of the rear threaded drill shaft of the impact drill. Fix the impact drill on a rigid bracket and measure with a dial indicator. The measuring point is on the end face of the four cylinders after the drill shaft is exhausted, 8mm away from the center line of the drill shaft. When measuring the suspension, the drill shaft should have no axial movement. The impact drill is used to slowly rotate the drill shaft for 3 cycles at low voltage or in other appropriate ways. The average value of the difference between the maximum and minimum values on the dial gauge is the end face circular runout value. The measurement results shall comply with the provisions of 4.4.1.
5.2.2 Inspection of the impact drill shaft
5.2.2.1 Inspection of the effective working length of the impact drill shaft surface On the working length of the surface, apply a uniform thin layer of colorant to the axis, then put on a standard cone gauge with the same taper as the drill shaft, and grind several times. At this time, the relative rotation angle should not exceed 90°. Take out the gauge and measure the length of the colorant on the drill shaft that has been ground open. The measurement results shall comply with the provisions of 4+4.2.1. 5.2.2.2 Inspection of the radial runout of the impact drill shaft Fix the impact drill on a rigid bracket and measure with a dial gauge. The measuring point is 5 mm away from the outer end of the drill. During measurement, the drill shaft should have no axial motion. The impact drill is rotated slowly for 3 cycles by low voltage or other appropriate means. The average value of the difference between the maximum and minimum values on the dial gauge for 3 times is the radial runout value. The measurement result should comply with the provisions of 4.4.2.2. 5.3 Beam sound test
The noise test of the impact drill shall be carried out in accordance with the provisions of GB/T4583. During measurement, the impact drill shall run continuously at no-load at rated voltage. 109
The measurement result shall comply with the provisions of 4.6.
5.4 Measurement of radio and television interference level JB/T7839—1999
The measurement of radio and television interference level by the impact drill shall be carried out in accordance with the provisions of GB4343. During measurement, the impact drill shall run continuously at no-load with the drill chuck.
The test result shall comply with the provisions of 4.7.1.
5.5 Harmonic current measurement
When the spectrum current of the impact drill is measured in accordance with the provisions of GB17625.1, the impact drill shall be continuously operated without load with the drill chuck. The measurement results shall comply with the provisions of 4.7.2.
5.6 Voltage fluctuation and flicker measurement
The voltage fluctuation and flicker measurement of the impact drill shall be carried out in accordance with the provisions of GB17625.2. When measuring, the impact drill shall be continuously operated without load with the drill chuck. The measurement results shall comply with the provisions of 4.7.3.
5.7 Inspection of commutation sparks
After the impact drill runs without load for 15 minutes at rated voltage and during the test of 5.8, observe the sparks under the brush. The inspection results shall comply with the provisions of 4.8.
5.8 Measurement of input power, current and basic parameters When the impact drill is at rated voltage, 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, continue to increase the load of the impact drill until the output power 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 impact drill runs for 15 minutes, measure the input power, current, speed and output power of the impact drill, and convert the number of impacts according to the speed and the number of teeth of the impact mechanism. bZxz.net
For this type of impact drill, when measuring, care should be taken to keep the voltage at the impact drill plug at the rated voltage value, and the input power should deduct the line loss between the plug and the power meter.
Test results show that the number of impacts should comply with the provisions of 3.1, and the input power and current should comply with the provisions of 4.9. 5.9 Impact test
5.9.1 Applied load
After 5.8, apply torque according to the load determined in 5.8 at rated voltage. If the input power at this time is less than 4/5 of the input power indicated on the nameplate, increase the torque to make the input power equal to 4/5 of the input power on the network plate, and use this torque as the load for the temperature rise test of the impact drill.
5.9.2 Running time
Continuously run under the conditions specified in 5.9.1 until the temperature rise of each part of the impact drill reaches the actual stable state. 5.9.3 Method of temperature rise measurement
After the temperature rise of each part of the impact drill reaches the actual stable state, 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 should meet the requirements of 4.10.
5.10 Over-torque test
Disconnect the impact mechanism of the impact drill and, when the temperature rise reaches the actual stable state, make the torque applied to the drill shaft reach 1.5 times the load torque measured in 5.8 at the rated voltage.
The test lasts for 15 seconds.
The test results should comply with the provisions of 4.11.
5.11 Blocked-rotor test
Block the rotating part of the impact drill in the actual cold state in advance, then apply the rated voltage, and disconnect the power supply after 3s. Then run the impact drill at no-load for 30s at the rated voltage to check whether it is normal. 110
The test result shall comply with the provisions of 4.12.
5.12 Measurement of initial starting current
JB/T 7839—1999
When carrying out the blocked-rotor test in 5.11, measure the initial starting current value. Then divide the current by the current value measured in 5.8. The test result shall comply with the provisions of 4.5.
5.13 Withstand voltage test of impact drill plug Attach metal foil to the handle of the outer surface of the plug body, and then apply a test voltage with a waveform of actual sine wave, a frequency of 50Hz, and a voltage value of 3750V between the pin and the metal box for 1min. The test result shall comply with the provisions of 4.2.2.
5.14 Check the length of the power cord
Measure the length of the power cord from the cable entry hole on the impact drill to the plug (excluding the pins), and check the specifications of the power cord. The inspection results should comply with the provisions of 4.13 and 4.2.3. 5+15 Other test methods
All other test methods specified in this standard shall be carried out in accordance with the corresponding provisions of GB3883.6. 6 Inspection rules
6.1 Each impact drill must be inspected and qualified by the quality inspection department in accordance with the provisions of this standard before it can be shipped out of the factory. When it leaves the factory, it should be accompanied by documents proving that the product is of qualified quality.
6.2 The following items specified in this standard are type inspection items. Among them, the items marked with "*\" are inspection test items, and the items marked with "**\" are not carried out during regular quality spot checks. Appearance inspection*
Marking inspection*
Electric shock protection inspection*
Starting test
Drill shaft test
Noise test
Radio and TV interference level measurement
Spectrum wave current measurement
Voltage fluctuation and flashover measurement
Commutation spark inspection*
Input power, current and basic parameter measurementTemperature rise test
Over torque test
Leakage current measurement
Stalling test
Initial starting current measurement
Anti-excitation test
Insulation resistance measurement
Withstand voltage test*
Durability test
Abnormal operation test
Machinery hazard inspection*
Machine core strength inspection
Grounding device inspection
Structural inspection**
Internal wiring inspection
Component test (plug withstand voltage test)* *Power cord length inspection
Power connection inspection
Flexible cable or cord pulling force and torque testFlexible cable or cord and guard bending test*
External wire terminal inspection**
Screw and connector inspection*
JB/T7839—1999
Creep distance, electrical clearance and insulation penetration distance inspectionHeat resistance, flame resistance and anti-slip trace test**Rust test
Note: Inspection test For medium withstand voltage test items, the test voltage and time may be different from those for type test. 6.3 Type test shall be conducted in any of the following cases: a) When trial production of new products is completed:
b) When changes in product design or process are sufficient to cause changes in certain performances, type test of relevant items shall be conducted; c) When the inspection test results deviate unacceptably from the results of previous type tests; d) Regular sampling test:
e) When the national quality supervision department requires sampling inspection. 6.4 The test shall be conducted in the order of the test items listed in 6.2. 6.5 Except for the tests of relevant items that require the use of separately provided parts (such as steel brush springs, grounding screws and washers, etc.) and components (such as switches, etc.), the remaining test items shall be conducted on the same sample and shall pass all tests. If it is necessary to disassemble the prototype for relevant tests, an additional prototype may be added.
7 Marking and packaging
7.1. The nameplate of the impact drill should be marked with the following items; a) Product name (impact drill); b) Impact drill model: c) Maximum diameter of holes drilled on steel, mm; d) Rated voltage, V; e) Power type symbol; f) Rated input power, W: or rated current, A; g) Rated speed, t/min; h) Rated number of impacts, /min i) Class I structure symbol (only for [Class I structure impact drills) i) Moisture resistance degree symbol (only marked when required); k) Manufacturer's name or trademark; 1) Factory batch code.
Note: The speed mark should comply with the relevant provisions of 7.1 and 7.5 of GB3883.6-1991. 7.2 The impact drill with dual functions should have obvious "drill", "punch" selection marks or symbols with clear meanings on the casing. 7.3 The drill shaft of the impact drill should be temporarily sealed with anti-rust coating when leaving the factory. 7.4 The following documents should be attached to the impact drill when leaving the factory: a) Product certificate;5 Except for the tests of related items that require the use of separately provided parts (such as steel brush springs, grounding screws and washers, etc.) and components (such as switches, etc.), the remaining test items should be carried out on the same sample and should pass all tests. If it is necessary to disassemble the prototype for related tests, an additional prototype can be added.
7 Marking and packaging
7.1. The nameplate of the impact drill should be marked with the following items; a) Product name (impact drill); b) Impact drill model: c) Maximum diameter of holes drilled on steel, mm; d) Rated voltage, V; e) Power type symbol; f) Rated input power, W: or rated current, A; g) Rated speed, t/min; h) Rated number of impacts, /min i) Class I structure symbol (only for [Class I structure impact drills) i) Moisture resistance degree symbol (only marked when required); k) Manufacturer's name or trademark; 1) Factory batch code.
Note: The speed mark should comply with the relevant provisions of 7.1 and 7.5 of GB3883.6-1991. 7.2 The impact drill with dual functions should have obvious "drill", "punch" selection marks or symbols with clear meanings on the casing. 7.3 The drill shaft of the impact drill should be temporarily sealed with anti-rust coating when leaving the factory. 7.4 The following documents should be attached to the impact drill when leaving the factory: a) Product certificate;5 Except for the tests of related items that require the use of separately provided parts (such as steel brush springs, grounding screws and washers, etc.) and components (such as switches, etc.), the remaining test items should be carried out on the same sample and should pass all tests. If it is necessary to disassemble the prototype for related tests, an additional prototype can be added.
7 Marking and packaging
7.1. The nameplate of the impact drill should be marked with the following items; a) Product name (impact drill); b) Impact drill model: c) Maximum diameter of holes drilled on steel, mm; d) Rated voltage, V; e) Power type symbol; f) Rated input power, W: or rated current, A; g) Rated speed, t/min; h) Rated number of impacts, /min i) Class I structure symbol (only for [Class I structure impact drills) i) Moisture resistance degree symbol (only marked when required); k) Manufacturer's name or trademark; 1) Factory batch code.
Note: The speed mark should comply with the relevant provisions of 7.1 and 7.5 of GB3883.6-1991. 7.2 The impact drill with dual functions should have obvious "drill", "punch" selection marks or symbols with clear meanings on the casing. 7.3 The drill shaft of the impact drill should be temporarily sealed with anti-rust coating when leaving the factory. 7.4 The following documents should be attached to the impact drill when leaving the factory: a) Product certificate;
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