Published: 1996.12.26 GB 3883.7-1991 Safety of hand-held power tools Part 2: Special requirements for electric hammers (available for certification) GB3883.7-1991 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Safety of hand-held motor-operated electric tools
Part 2: Particular requirements for electric hammers
Safety of hand-held motor-operated electric toolsPart 2: Particular requirements for electric hammers (available for certification)
GB3883.7-91
IEC745-2-6
instead of GB3883.7-85
This standard is equivalent to IEC745- 2-6 "Safety of Handheld Power Tools Part 2: Special Requirements for Electric Hammers" first edition. This standard should be used together with GB3883.1 "Safety of Handheld Power Tools Part 1 General Requirements". This standard lists the changes necessary to convert Part 1 into the "Safety Requirements for Electric Hammers" standard. 1 Scope of application
Except for the following provisions, this chapter of Part One applies. 1.1 is changed to:
This standard applies to electric hammers and electric picks.
2 Definitions
This chapter of Part One applies except for the following: 2.2.23 Paragraph 1.
Modification:
Normal load means that the electric pick is installed vertically on the tester shown in Figure 101, with the 30s running period and the 90s tool power-off period as one cycle, when the electric pick is operated intermittently reached load. During operation, a minimum axial force that just ensures the stable operation of the hammer mechanism is exerted on the electric pick through an elastic body.
And add:
Note: The normal load definition of electric hammers (rotary electric hammers and vibrating armature electric hammers) is under consideration. Added definition:
2.2.101 Electric picks are used for chipping and pounding concrete, road paving and similar materials, and for compacting and consolidating materials in building construction. The electric pick has a built-in impact mechanism, and the impact energy is not affected by the operator. 2.2.102 Electric hammers are used for drilling holes in marble, concrete, artificial and natural stone and similar materials. In operation, they are identical to electric picks but with the added rotational motion.
3 General requirements
This chapter of Part 1 applies.
4 General considerations for testing
This chapter of Part 1 applies.
The State Administration of Technical Supervision approved the implementation on 1992-02-01 on 1991-05-27
5 Ratings
This chapter of the first part applies.
6 categories
This chapter of Part 1 applies.
7 flags
This chapter of Part One applies.
8 Protection against electric shock
This chapter of Part 1 applies.
9 Startup
This chapter of Part 1 applies.
10 Input power and current
This chapter of Part 1 applies.
11 Fever
GB 3883.7-91
Except for the following provisions, this chapter of Part One applies. 11.2 Added:
If the electric pick or electric hammer cannot reach the rated input power when operating under the specified normal load, a brake can be used to load it, and the brake can be adjusted to make the electric pick or electric hammer reach the rated input power. . At this time, the impact mechanism should be disengaged or removed. Note: The specified housing temperature rise limit does not apply to the housing of the impact mechanism. 12Leakage current
This chapter of Part 1 applies.
13 Radio and television interference suppression
This chapter of Part 1 applies.
14 Moisture resistance
This chapter of Part 1 applies.
15 Insulation resistance and dielectric strength
This chapter of Part 1 applies.
16 Durability
Except for the following provisions, this chapter of Part 1 applies: 16.2 Modification:
The electric pick and electric hammer are installed on the tester of Figure 101, in Under rated voltage or the upper limit of the rated voltage range and normal load, run intermittently for four 6-hour operating periods, and the interval between each operating period shall be at least 30 minutes. 17 Abnormal Operation
This chapter of Part 1 applies.
18 Mechanical Hazards
This chapter of Part 1 applies.
19 Mechanical Strength
GB3883.7-91
Except for the following provisions, this chapter of Part One applies: 19.2 Modification:
Electrical products with a mass greater than 10kg Pickaxes and electric hammers are not subject to this test. 20 Structure
This chapter of Part One applies.
21
Internal Wiring
This chapter of Part 1 applies.
22 components
This chapter from Part 1 applies.
23 Power supply connection and external flexible cables and cords In addition to the following provisions, this chapter of Part 1 applies: 23.3 Modification:
The power cable shall be at least flexible with ordinary neoprene sheath. Cable (GB8898). 24 Terminals for external conductors
In addition to the following provisions, this chapter of Part One applies: 24.1 Addition:
If there is no risk of disconnection at the connection, soldering connection terminals may be used , regardless of the rated input power. 25 Earth protection
This chapter of Part 1 applies.
Screws and couplings
26
This chapter of Part 1 applies.
Creepage distances, electrical clearances and insulation penetrations 27
This chapter of Part 1 applies.
28 Heat resistance, flame resistance and resistance to leakage and tracking. This chapter of Part 1 applies.
29 Rust Prevention
This chapter of Part 1 applies.
Note: Annotations for Figure 101:
GB3883.7-91
Figure 101 Electric hammer tester
Synthetic rubber disc, Shore hardness 70~80, Thickness 10mm, diameter 75mm2-
3
6
6-
7
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9-
— Polyamide lined yoke for tool handle. Sample.
A spring that applies force to the sample.
Impact head.
Quenched steel ball with a diameter of 38mm.
The steel backing plate with mass M and diameter D has grooves on the bottom plate, as shown in the figure. Synthetic rubber disc, shore hardness 7080, 6~7mm thick, tightly fits the cavity. A steel base with mass M has a circular cavity on it with a diameter 1 mm larger than the steel backing plate. There is a groove at the bottom of the cavity, as shown in the figure. 10-
11-
A concrete foundation set on a compacted foundation. Steel columns preventing any horizontal displacement.
12----Polished surface and edges.
In order to ensure the stable operation of the impact mechanism, if necessary, the test submitter can provide a suitable impact head (with handle) when submitting the tool, and its total mass should be less than the value specified in the table below.
Tool rated input power
W
700 and below
700 and above to 1 200
1 200 and above to 1 800
1800 Above to 2.500
D
Backing plate diameter
mm
100
140
180
220||tt ||GB 3883.7-91
M
4
Distance between four groove centers

mm
6.50||tt| |5.75
5.00
4.50
Steel base
Weight
kg
90
180
270
360
M
Backing plate
Weight
kg
1.00
2. 25||tt| |3.80
6.00
M
Impact head
(with handle)
Total weight
kg
0.7| |tt||1.4
2.3
3.4
This addendum to Part 1 applies.
This addendum to Part 1 applies.
This addendum to Part 1 applies.
This addendum to Part 1 applies.
Additional instructions:
GB3883.7—91
Appendix A
Thermal circuit breaker and overload release
(supplement)
Appendix B
Electronic circuit||tt| |(Supplement)
Appendix C
Structure of safety isolation transformer
(Supplement)
Appendix D
Creepage distance and clearance Measurement
(Supplement)
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Power Tools. This standard was drafted by the Shanghai Power Tool Research Institute of the Ministry of Mechanical and Electronic Industry. The main drafters of this standard are Li Hongzhao and Qian Naichi.
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