Some standard content:
JB/T 78251999
This standard is the first revision of JB/T78251995 "Electric Stone Cutting Machine". This standard complies with GB3883.18-1991 "Safety of Hand-held Electric Tools: Part 2: Special Requirements for Electric Stone Cutting Machines". This standard adds 4.5.2, 4.5.3, 5.5, 5.6, and modifies 2, 8. This standard is compiled in accordance with GB/T1.1-1993 "Basic Provisions for the Preparation of Standardization Work Guidelines".
This standard replaces JB/T7825-1995 from the date of implementation. Unit 1: Drafting and Expression Rules of Standards This standard is proposed and managed by the National Technical Committee for Standardization of Electric Tools. The drafting unit of this standard: Wenri Electric Tools Co., Ltd. The main drafters of this standard: Zheng Yuan, Xue Sidan. 84
Part 1: Standard
Machinery Industry Standard of the People's Republic of China
Electric Marbie Cutters
JB/T7825-1999
Replaces JB/T7825-1995
This standard specifies the basic parameters and types, technical requirements, test methods, inspection rules and marking, packaging and other requirements of electric marbie cutters. This standard applies to AC/DC dual-purpose, single-phase series-excited marbie cutters (hereinafter referred to as cutters) that use diamond cutting blades (hereinafter referred to as cutting blades) to cut silicate-containing materials such as stone, marble slabs, tiles, cement slabs, etc. in general environments. 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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T755—1987
GB1002—1996
GB.2099.11996
GB3883.18—1995
GB4343-1995
GB/T4583—1995
GB 5013.4—1997
GB5023.5—1997
GB/T9088—1988
GB17625.1—1998
GB17625.2—1999
3Basic parameters and types
Basic technical requirements for rotating electrical machines
Single plug and socket typeBasic parameters and dimensionsPlugs and sockets for household and similar usePart 1: General requirements (eqvIEC60884:1994)
Safety of hand-held electric toolsPart 2: Particular requirements for electric stone cutting machinesMethods 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.14:1993)Measurement of operating noise of electric tools Procedure method
Rubber insulated flexible cables with rated voltage of 450/750V and below (idtIEC60245:1994)
Part 4: Flexible cords and flexible cables
Polyvinyl fluoride insulated cables with rated voltage of 450/750V and below: Part 5: Flexible wires (flexible cords) (idtIEC60227:1993)
Model compilation method for electric tools
Limits of harmonic currents emitted by low-voltage electrical and electronic equipment (input current per phase of equipment ≤16A) (idtIEC610003-2:1995)
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)The basic parameters of the cutting machine 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
3.2 Meaning of cutting machine model
Cutting size
Outer diameter×inner diameter
110×20
110×20
125×20
150×20
180×25
200×25
250×25
JB/T7825—1999
Rated output power
≥550
≥730
The model of the cutting machine shall comply with the provisions of GB/T9088, and its meaning is as follows; z E-0O 0-00
Specification code
Design serial number
Design unit code
Rated torque
Stone cutting machine (product code)
Power category code
Architecture category (major category code)
4 Technical requirements
4.1 General requirements
4.1.1. The cutting machine shall be manufactured according to the drawings and technical documents approved by the prescribed procedures and comply with the provisions of this standard. 4.1.2 The cutting machine shall be able to operate at rated speed under the following environmental conditions: a) The altitude 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 The applicable power supply conditions for the cutting machine are: Maximum cutting depth
The AC/DC dual-purpose cutting machine should be able to operate under a single-phase AC power supply with a DC power supply voltage of a practical sine waveform and a rated frequency. 4.1.4 Rated voltage and frequency
a) AC rated voltage: 220, 42, 36V; b) DC rated voltage: 220V;
c) AC rated frequency; 50Hz.
4.2 Safety of cutting machine
4.2.1 The safety of the cutting machine, except for the provisions that have been supplemented and improved in this standard, shall comply with the provisions of GB3883.1. 4.2. 2
The cutting machine shall have a mechanism for adjusting the cutting depth. This adjustment mechanism shall not become loose during normal use of the tool. The cutting machine shall be equipped with a cutting blade protective cover that can only be removed by hand. After the protective cover is installed, the angle of the exposed part of the cutting blade should not be greater than JB/T7825-1999
4.2.4 Except for heavy-duty cutting machines, the plug of the cutting machine shall comply with the provisions of GB1002. The plug of the Class 1 cutting machine shall be made into one piece with the power cord, and its insulation shall be able to withstand a withstand voltage test of 3750V with a waveform of an actual sine wave, a rate of 50Hz, and a voltage value of 1min, and no breakdown or surface flashover shall occur. 4.2.5 The soft cable or cord connecting the cutting machine to the power supply shall comply with the provisions of GB5013.4, or use a soft cable or cord with performance not lower than that of GB5013.4.
4.3 Appearance quality of the cutting machine
The plastic shell of the cutting machine shall not have bubbles, cracks, obvious shadows and concave thinness, the surface of the metal shell shall not be damaged, and the coating shall be evenly polished. The nameplate of the cutting machine shall be firmly and without curling on the surface of the cutting machine shell. 4.3.2
4.4 Cutting disc clamping plate
The cutting machine shall have two cutting disc clamping plates, the outer diameter D of the two plates and the contact surface B between the two plates and the grinding wheel shall be the same size (see Figure 1).
The dimensions of the two clamping plates shall comply with the provisions of Table 2. Table 2
Outer diameter of cutting disc
4.5 Electromagnetic compatibility
4.5.1 Radio and television interference level
Dimensions of clamping plates
Clamping plates
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.
>0.35~5. 00
>5. 00~30. 00
Allowable value of continuous interference voltage
Interference voltage
dB(μV)
decreases linearly with the logarithm of the rated rate
b) The continuous interference power level radiated by the power line and absorbed by the absorbing clamp measured in the frequency range of 30~300MHz should not exceed the allowable value specified in Table 4.
4.5.2＇Harmonic current
30~300bZxz.net
JB/T 7825—1999
Permissible value of continuous interference power
Interference power
dB(PW)
Increases linearly with frequency 45 to 55
a) The steady-state harmonic current of the cutting machine shall not exceed the limit specified in Table 5. Table 5 Steady-state harmonic current limit
Harmonic order
Maximum permissible harmonic current
Odd harmonic
Even harmonic
0.225×15/n
0.345×8/n
b) For even harmonics 2 to 10 and odd harmonics 3 to 19, the transient harmonic current value allowed to be no more than 15s in any 2.5min observation period is 1.5 times the steady-state harmonic current limit specified in Table 5. 4.5.3 Voltage fluctuation and flicker
When the cutting machine is connected to the low-voltage power grid, the voltage fluctuation value and flicker value caused shall comply with the following provisions: P. value shall not be greater than 1.0;
P value shall not be greater than 0.65;
steady-state relative voltage change d. shall not exceed 3%; the maximum relative voltage change dm 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 Pu shall not be assessed. The steady-state relative voltage change value d, the maximum relative voltage change dmx, and the voltage change characteristic value d(t) shall be multiplied by a coefficient of 1.33. Radial runout of the cylindrical surface of the shaft
The radial runout value of the cylindrical surface of the shaft of the cutting machine shall not exceed 0.04mm. 4.7
The average value of the no-load noise sound pressure level (A-weighted) of the cutting machine measured at the spherical surface 1000mm away from the center of the cutting machine shall not exceed the allowable value specified in Table 6.
Cutting machine specifications
Sound value
90(100)
Noise allowable value
91(101)
92(102)
Note: The noise value of the cutting machine measured in the reverberation room, its sound power level (A-weighted) shall not exceed the allowable value specified in the brackets in the table. 4.8
Commutation spark
JB/T7825-1999
When the cutting machine is under rated voltage, no-load and rated load, the spark under the brush should not exceed Level 2 specified in GB/T755--1987. 49 Input power and current
4.9.1 When the cutting machine is under rated voltage and rated load, its input power should not exceed 120% of the input power value indicated on the nameplate. 4.9.2 If the current value is marked on the nameplate of the cutting machine, its current should not exceed 120% of the current value indicated on the nameplate under rated voltage and rated load.
4.10 Temperature rise
When the cutting machine is under rated load, the temperature rise of the cutting machine should not exceed the value specified in Table 7. Table 7
Temperature rise limit
E-class insulation group
B-class insulation winding
F-class insulation winding
Normal use non-holding housing
Handle, button and similar parts held continuously in normal use: metal
Note: When the altitude of the test site or the use site is different from the specified environmental conditions, the correction of the over-rise limit of the burning group shall be carried out in accordance with the provisions of GB/T755. Over-torque
The cutting machine shall be able to operate normally after the over-torque test of 1.5 times the rated torque in the hot state and lasting 15s. 4.12
Power cord length
The length of the power cord of the cutting machine from the power cord inlet to the plug (excluding the pins) shall be not less than 2.5m. 4.13 Rust prevention
The steel brush springs, screws, etc. of the cutting machine shall be surface treated to prevent rust. The steel brush spring and grounding screw and the whole circle should be subjected to rust prevention test.
Test method
5.1 Appearance inspection
The appearance quality of the cutting machine shall be inspected by observation and manual test. The inspection results shall comply with the provisions of 4.2.2, 4.3.1 and 4.3.2. 5.2 Noise test
The noise test of the cutting machine shall be carried out in accordance with the provisions of GB/T4583. The test results shall comply with the provisions of 4.7.
5.3 Inspection of the clamping plate of the cutting disc
Remove the two clamping plates of the cutting disc and measure the outer diameter of the clamping plate and the size of the contact surface between the clamping plate and the cutting disc with a vernier caliper. The inspection results shall comply with the provisions of 4.4.
5.4 Measurement of radio and television interference level The measurement of radio and television interference level of the cutting machine shall be carried out in accordance with the provisions of GB4343. During the measurement, the cutting machine shall run continuously without load with the cutting disc. The test results shall comply with the provisions of 4.5.1.
5.5 Harmonic current measurement
The harmonic current measurement of the cutting machine shall be carried out in accordance with the provisions of GB17625.1. During the measurement, the cutting machine shall be operated continuously without load with the cutting disc. The measurement results shall comply with the provisions of 4.5.2.
5.6 Voltage fluctuation and flicker measurement
JB/T7825—1999
The voltage fluctuation and flicker measurement of the cutting machine shall be carried out in accordance with the provisions of GB17625.2. During the measurement, the cutting machine shall be operated continuously without load with the cutting disc. The measurement results shall comply with the provisions of 4.5.3.
5.7 Shaft extension cylindrical surface radial runout inspection
The cutting machine is fixed on a rigid support and measured with a dial indicator. The measuring point is the middle position of the shaft extension cylindrical surface. The shaft extension is rotated slowly for three revolutions at a lower 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 cylindrical surface of the shaft extension. The inspection result shall comply with the provisions of 4.6.
5.8 Commutation spark inspection
The cutting machine is run at rated voltage for 15 minutes without load. When no load and in the test of 5.10, observe the spark under the brush. During the inspection test, only the commutation spark is checked when no load. The inspection result shall comply with the provisions of 4.3.
5.9 Input power, current and working parameter measurement Under rated voltage, make the applied torque reach 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 cutting machine until the output power of the cutting machine reaches this value. After the cutting machine has run for 15 minutes, measure the input power, current, torque and output power of the cutting machine. The test results shall comply with the provisions of 3.1 and 4.9. 5.10 Temperature rise test
5.10.1 Applied load
Apply torque according to the load determined in 5.9 at rated voltage. If the input power of the cutting machine is less than the rated input power indicated on the nameplate, increase the load so that the input power of the cutting machine 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.
5.10.2 Running time
Continuously run under the conditions of 5.10.1 until the temperature rise of each part of the cutting machine reaches the actual stable state. After the temperature rise of each part 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 inspection results should comply with the provisions of 4.10.
5.11 Overtorque test
When the temperature rise reaches stability, increase the torque at rated voltage so that the output torque reaches 1.5 times the load torque measured in 5.10. The test lasts for 15s.
The inspection result shall comply with the provisions of 4.11.
5.12 Inspection of protective cover
Inspect the protective cover and measure the angle of the exposed part of the saw blade by observation and using an angle ruler. The inspection result shall comply with the provisions of 4.2.3.
5.13 Voltage withstand test of sub-category cutting machine plugs Attach metal to the knob on the outer surface, and then apply a test voltage of 3750V between the plug pins and the metal foil for 1 minute. The inspection result shall comply with the provisions of 4.2.5.
5.14 Inspection of power cord length
Measure the length of the power cord from the power cord inlet of the cutting machine to the plug surface (excluding the pins). The inspection result shall comply with the provisions of 4.12.
5.15 Inspection of cutting depth
The cutting depth is adjusted to the maximum position. At this time, measure the vertical distance from the lower plane of the cutting machine bottom plate to the periphery of the cutting blade. It shall comply with the provisions of Table 1.
Other test methods
JB/T 7825-1999
Other test methods not specified shall be carried out in accordance with the provisions of GB3883.18. Inspection rules
Each cutting machine must pass the test of the quality management department before leaving the factory. The documents proving the quality of the product shall be attached when leaving the factory. 6.1
6.2 The items specified in this standard are type test items. The items marked with "*" are inspection test items. After the product is finalized, if the structure and materials have not changed, the items marked with "**\" may not be carried out in the subsequent type test. Appearance inspection*
Marking inspection*
Electric shock protection inspection**
Noise test
Radio and television interference level measurement
Harmonic current measurement
Voltage fluctuation and flicker measurement
Starting test
Shaft extension cylindrical surface radial runout inspection
Commutation spark inspection*
Input power, current and working parameter measurementTemperature rise test
Over-torque test
Moisture-proof test
Insulation resistance measurement||tt ||Withstand voltage test*
Durability test
Abnormal operation test
Mechanical hazard inspection**
Mechanical strength inspection (excluding impact test)Grounding device inspection
Protective cover inspection**
Cutting depth inspection**
Inspection of cutting blade clamping plate**
Structural inspectionBend number
Internal wiring inspection
Component test (including withstand voltage test of Class II plug)*Power cord length inspection
Power connection inspection
Flexible cable or flexible wire tension and torsion test
Flexible cable and sheath bending test*
Inspection of terminal blocks for external wires**
Screw and connection inspection Check*￥
Creep distance, electrical clearance and insulation penetration distance. Check heat resistance, flame retardancy and anti-leakage trace test**Rust test
6.3 Inspection method
JB/T7825—1999
6.3.1 The test shall be carried out in the order of the test items listed in 6.2. 6.3.2 Except for the parts provided (such as screws for rust test, etc.), the relevant test items shall be carried out on the same prototype and pass all tests. If the prototype needs to be disassembled for relevant tests, another prototype can be added. 7 Marking and packaging
7.1 Marking
7.1.1 The nameplate of the cutting machine shall be marked with the following items: a) Product name (stone cutting machine);
b) Cutting machine Model;
c) Cutting machine blade diameter, mm;
d) Maximum cutting depth;
e) Rated voltage, V;
f) Power supply type name;
g) Rated input power, W or kW, or rated current A;
h) No-load speed, r/min;
i) Class I structural symbol (only marked on Class I cutting machines);
k) Factory batch code.
7.1.2. The direction of rotation of the cutting blade shall be indicated by a convex or concave arrow or other clear and durable means of indication. 7.2 Documents that should be attached to each cutting machine when it leaves the factory7.2.1 Product certificate.
7.2.2 Operation and maintenance instructions.
The following contents should be explained in the instructions:1) Relevant description of the characteristics and uses of the cutting machine. 2) There should be an independent chapter to explain the safety technical requirements for the use of the cutting machine and the precautions for operation and use. The content should include: a) For wet cutting machines, except for heavy types, they must be powered by an isolation transformer, and the transformer model or technical parameters of the transformer should be specified;
b) Selection of cutting blades;
c) Safety inspection before using the cutting machine;
d) The cutting machine can only be operated after it reaches full speed; e) Determine the maximum cutting depth that the cutting machine can reach according to different materials. 3) Relevant maintenance matters.
8 Warranty period and accessories
8.1 Warranty period
If the user follows the provisions of the cutting machine manufacturer's operating and maintenance instructions, and transports, stores and uses the cutting machine correctly, within the warranty period specified by the manufacturer, if the cutting machine is damaged or cannot work normally due to poor manufacturing quality, the manufacturer shall repair or replace it for the user free of charge.
8.2 Accessories
When the cutting machine leaves the factory, it should be accompanied by special tools for disassembling and installing the cutting blade. 92
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