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ICS29.120.60
Machinery Industry Standard of the People's Republic of China
JB/T1648—1999
Wet multi-plate electromagnetic clutch
Published on 1999-05-20
State Machinery Industry Bureau
Implementation on 2000-01-01
JB/T1648—1999
This standard is a revision of B1648-86 "Wet multi-plate electromagnetic clutch". Compared with JB1648-86, the product performance indicators of this standard have not changed. The main differences between this standard and JB1648-86 are as follows: 1. The reference standards have been adjusted;
1. The expression method of the insulation coordination of the system in the dielectric performance has been changed accordingly; 1. The number of type test specimens has been adjusted from three to two; 1. The regular test was originally conducted every three years, but now it is conducted every four years; 1. The number of regular test specimens has been adjusted from three to two; 1. If only one item fails in the test, the item is allowed to be retested according to the original number, but now it is allowed to retest the item according to the original number of extractions doubled.
1. Due to the expansion of product specifications, 160 performance parameters have been added this time. This standard replaces JB1648-86 from the date of implementation. This standard is proposed and managed by Chengdu Machine Tool Electrical Equipment Research Institute. The drafting unit of this standard: Tianjin Machine Tool Electrical Equipment General Factory. This standard was first issued in 1975 and revised for the first time in 1986. 1 Scope
Machinery Industry Standard of the People's Republic of China
Wet Multi-disc Electromagnetic Clutch
JB/T 1648—1999
Replaces JB1648-86
This standard specifies the type, basic parameters, technical requirements, test methods and inspection rules, transportation, storage, etc. of wet multi-disc electromagnetic clutch.
This standard applies to multi-disc electromagnetic clutches (hereinafter referred to as clutches) working under wet conditions. In the mechanical transmission system, the clutch can make the active part and the driven part complete the combination or separation when the active part is running. This standard also applies to wet multi-disc electromagnetic brakes. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB 191—1990
GB/T 2828—1987
GB/T4026—1992
GB/T4207—1984
GB/T 5226.1—1996
GB/T14048.1—1993
3 Terms and Symbols
This standard uses the following terms.
3.1 Wet multi-plate electromagnetic clutch
Packaging, storage and transportation pictorial marking
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Identification and application of wiring terminals and specific wire ends of electrical equipment General rules for alphanumeric systems Methods for determining the comparative tracking index and resistance tracking index of solid insulating materials under humid conditions Electrical equipment for industrial machinery Part 1: General technical conditions General rules for low-voltage switchgear and control equipment
Clutch composed of electromagnetic system and friction plate group and working under oil lubrication conditions. 3.2 Clutch with slip ring
Clutch with rotating coil and exciting current introduced through brushes and slip rings. 3.3 Clutch without slip ring
Clutch with non-rotating coil and exciting current introduced through a pair of terminals or wires. 3.4
Static torque
The maximum torque transmitted from the active side to the driven side when the clutch is in the excited state and there is no relative sliding between the inner and outer friction plates. 3.5 Torque
The torque transmitted from the active side to the driven side when the clutch is in the excited state and there is relative sliding between the inner and outer friction plates. 3.6
No-load torque
The torque transmitted from the active side to the driven side when the clutch is in the non-excited state and the active side rotates. 3.7 Connection time
Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
JB/T 1648—1999
The time required for the torque to rise to 80% of the rated torque from the time the clutch coil is energized. Disconnection time
The time required for the torque to drop to 10% of the rated torque from the time the clutch coil is de-energized. Average linear speed
The tangential speed on the average friction radius of the effective friction surface of the friction plate. Type and basic parameters
1 Classification
4.1.1 According to the current introduction method:
4.1.1.1 Clutch with slip ring can be divided into: a) single slip ring type;
b) double slip ring type.
2 Clutch without slip ring
4. 1. 1. 2
According to the magnetic circuit characteristics:
Magnetic flux passes through the plate once;
Magnetic flux passes through the plate twice;
Magnetic flux does not pass through the plate.
According to the installation hole:
Spline hole;
b) Single key hole;
c) Smooth hole.
4.1.4 According to specifications:
The clutch is divided into 1.2, 2.5, 5, 10, 16, 25, 40, 63, 100, 160. Parameters
The main parameter of the clutch is the rated torque. Its main parameters and basic parameters are shown in Table 1. Table 1 Clutch parameters
Rated dynamic torque
Rated static torque
No-load torque (≤)
On time (≤)
Off time (≤)
Rated working voltage (DC)
Rated insulation voltage
Maximum allowable speed
12, 24, 48, 110
60, 125
5 Requirements
5.1 Normal working conditions and installation conditions
5.1.1 Ambient air temperature
JB/T1648—1999
The upper limit of the ambient air temperature is +40℃, and its average value within 24h does not exceed +35℃; a)
The lower limit of the ambient air temperature is -5℃.
The altitude of the clutch installation site shall not exceed 2000m. 5.1.2
The pollution level of the local micro-environment around the clutch is "pollution level 3". 5.1. 4
The installation category (overvoltage category) of the clutch is "installation category IⅡ". The clutch shaft is installed horizontally. When the active side and the driven side of the installation shaft are two shafts, the coaxiality tolerance level is "level 9". The clutch must work under the condition of lubricating oil. Its lubrication conditions are as follows: 5.1.6
The oil supply method is oil immersion, external oil pouring and shaft oil supply: b) The lubricating oil must be kept clean, the viscosity of the oil is 17×10-6~23×10-m/s (at 50C), and the recommended oil temperature is 20~40℃. Note: When the clutch is used in abnormal working conditions and installation conditions, it should be designed and used according to the agreement between the supply and demand parties. 5.2 Structural requirements
5.2.1 The appearance and installation dimensions of clutches of the same model and specification should be unified, and their values should comply with the provisions of the drawings and relevant documents. 5.2.2 The structural materials of the clutch shall meet the relevant application requirements and pass the corresponding tests on the product. 5.2.2.1 The magnetic conductive material of the clutch shall be made of high-quality carbon steel with good magnetic conductivity, electrical pure iron and other magnetic conductive materials with performance not lower than the above.
5.2.2.2 The current-carrying parts of the clutch shall be made of materials with sufficient current-carrying capacity and sufficient mechanical strength. 5.2.2.3 The insulation material of the clutch shall meet the requirements of the comparative tracking index (CTI value) of the insulation material in 5.2.5. 5.2.3 Current-carrying parts
5.2.3.1 The terminal shall be designed to ensure that the wire is clamped without damaging the wire, so that the connecting wire will not be displaced, so as not to damage the normal operation of the clutch or reduce the insulation voltage to below the specified value, and can withstand the mechanical strength test specified in 6.24. 5.2.3.2 The screws used to clamp the wires in the terminal shall not be used to fix other parts. 5.2.4 Electrical clearance
The minimum electrical clearance of the clutch is 0.8mm. 5.2.5 Creepage distance
The creepage distance of the clutch shall not be less than that specified in Table 2. Table 2 Minimum creepage distance
Rated insulation voltage U
>63~125
Creep distance
Material group
Ⅲa, Ⅲb
Regarding the classification of insulating material groups, they can be divided into the following four groups according to their comparative tracking index (CTI value): 3
Insulating material group I:
Insulating material group IⅡI:
Insulating material Group IⅢIa:
Insulating material group IIb:
General requirements
600≤CTI
1648—1999
400≤CTI<600
175≤CTI<400
100≤CTI<175
5.3.1 The surface of clutch plastic parts and cast resin should be smooth and flat, without protrusions, cracks or deformation. 2 The assembly quality of the clutch should comply with the requirements of the drawings and relevant technical documents, and screws and other fasteners should be firmly connected without looseness. 5.3. 2
3 The clutch shall be flexible when 75% of the rated working voltage is applied. 5.3.3
Parameter requirements
Under the specified test conditions (see 63), the clutch parameters shall comply with the provisions of Table 1, and the dynamic and static torque values shall not be less than the values specified in Table 1.
5.5 Dielectric properties
5.5.1 When the electrical clearance of the clutch is less than 0.8mm, an impulse withstand voltage test must be carried out, and the impulse withstand voltage value shall comply with the provisions of Table 3
The clutch shall be able to withstand the power frequency withstand voltage test of the test voltage value listed in Table 4 for 1 minute without breakdown or flashover Table 3 Rated impulse withstand voltage
Determined by the rated voltage of the power supply system
Relative to ground voltage DC maximum value
Installation category (overvoltage category) ⅡI||tt ||Priority value of rated impulse withstand voltage
(1.2/50μs,
Ump of 2000m)
Note: The listed impulse withstand voltage values are the test values at an altitude of 2000m. If the impulse withstand voltage test is conducted at an altitude different from 2000m, the impulse withstand voltage value needs to be multiplied by a correction factor, the value of which shall be in accordance with the provisions of Table 24 in 8.23.4.2 of GB/T14048.1-1993 4 Power frequency withstand voltage test voltage value
Rated insulation voltage U
>60 ~300
Power frequency withstand voltage test voltage value (AC effective value) 1000
2U+1000V AC effective value (but not less than 1500) The rated working voltage is applied to the clutch coil, and its stable temperature rise value shall not exceed the temperature rise limit listed in Table 5 5.7 Life
5.7.1 The clutch life and test conditions shall comply with the provisions of Table 6. V
2 Brush life Apply rated voltage at the speed specified in Table 6 (the slip ring line speed shall not be less than 6.5m/s), and work continuously for 800h5. 7. 2
The wear (length direction) shall not be greater than 3mm. 4
Insulating material heat resistance grade
1648—1999
Temperature rise limit of insulating coil
Temperature rise limit measured by resistance method
Coil in air
Note: The temperature rise limit of coil in air is recommended under the condition of annual average temperature of surrounding air of 20℃. For the condition of annual average temperature exceeding 20℃, the insulation coil shall be negotiated by both parties. Table 6|| tt||5 Life and test conditions
Specification code
Speed n
Moment of inertia 1
Oil flow rate ±10%
Note: The value of inertia I includes the clutch driven part and the connecting parts, 5.8
Performance to adapt to low temperature environment
Operation frequency
Electrification duration %
12×10
10×10t
7× 10
The clutch should be suitable for transportation and storage under low temperature environment conditions, and can withstand the low temperature storage test of -25℃. After the test, the plastic parts and cast resin shall not have bulges or cracks. 6
Test method
Basic requirements
The clutch to be tested shall comply with the drawings and technical documents approved by the prescribed procedures. Each test or each complete sequence test shall be carried out on a new and clean product. Part replacement or repair is not allowed during the test. The test power supply is a three-phase full-wave rectified DC power supply. The voltage fluctuation of the test power supply shall not exceed 5% during the test. The clutch test method shall be carried out in accordance with the relevant provisions of GB/T14048.1 except for the provisions of this standard. General inspection
Use visual inspection to check the surface quality of the clutch logo, packaging, casting resin, and plastic parts. 5
JB/T1648—1999
6.2.2 The assembly quality, shape and installation dimensions of the clutch, the circular runout and surface roughness of the outer diameter of the slip ring, the electrical clearance and creepage distance, etc. are measured with calipers, sub-meters or special tools, measuring tools and instruments. 6.2.3 Determination of the comparative tracking index (CTI value) of insulating materials. The maximum voltage value (expressed in V) when the insulating material sample is subjected to 50 drops of standard electrolyte (ammonium chloride) without the appearance of leakage traces is the CTI value of the insulating material. The test method of CTI value shall be carried out in accordance with the relevant provisions of GB4207.
6.2.4 The mechanical strength test of the terminal shall be carried out in accordance with 8.1 and 8.2 of GB/T14048.1-1993. 6.2.5 At room temperature, apply 75% of the rated working voltage to the clutch, switch on and off 6 times, and visually check that the movable parts such as friction plate and armature can move flexibly.
6.3 Parameter determination
6.3.1 Basic test conditions
a) The clutch shaft is installed horizontally:
b) The oil supply method is external oil pouring method or axial oil supply; c) The oil temperature is 30~40℃, and the oil viscosity is 17×10-6~23×10-m2/s (at 50℃); the oil flow rate should comply with the provisions of Table 7;
Test current: The current value when the clutch is at rated working voltage and the coil temperature is 80℃ Table 7 Flow
Basic specification code
6.3.2 Dynamic and static torque measurement
6.3.2.1 The dynamic torque of the clutch is measured when there is relative sliding between the inner and outer friction plates. When the relative sliding speed is measured as a constant value, its average linear speed is in the range of 0.5~2m/s. It is measured 3 times, and its average value is not less than the provisions of Table 1. 6.3.2.2 The static torque of the clutch is measured when the relative speed between the inner and outer friction plates is zero. When the hanging weight method is used for measurement, the inner and outer friction plates should be rotated 30°~40° relative to each other after the clutch is energized, and then the load should be gradually increased until slip occurs between the inner and outer friction plates. The measurement is repeated three times, and the average value should not be less than the requirements of Table 1. 6.3.3 Measurement of connection time and disconnection time
6.3.3.1 The connection time of the clutch is the time required for the torque to rise to 80% of the rated torque from the start of the coil being energized. 6.3.3.2 The disconnection time of the clutch is the time required for the torque to drop to 10% of the rated torque from the start of the coil being de-energized. The connection time and disconnection time of the clutch are measured on the torque curve obtained by the test under the conditions of 6.3.21, and the average value of the three times should meet the requirements of Table 1.
6.3.4 No-load torque measurement
The no-load torque test is measured when the clutch is not energized and the relative speed between the inner and outer friction plates is not less than 1000rmin. The no-load torque stability value shall comply with the provisions of Table 1. 6.4 Dielectric performance test
The basic conditions for the clutch pressure test shall comply with 8.23.4.1 of GB/T14048.1-1993. 6.4.1 Impulse withstand voltage testbzxz.net
6.4.1.1 The waveform of the impulse withstand voltage test shall comply with 7.23.1 of GB/T14048.1-1993. 6
6.4.1.2 The impulse withstand voltage application position: JB/T1648-1999
a) Between the slip ring, brush and the metal parts of the grounding part (applicable to double slip rings); b) Between the terminal and the metal parts of the grounding part (applicable to no slip rings). 6.4.1.3 During the impulse withstand voltage test, apply the impulse voltage of positive and negative polarity 3 times each (6 times in total), with an interval of at least 1S each time. If there is no breakdown or flashover during the test, it is considered qualified. 6.4.2 Power frequency withstand voltage test
6.4.2.1 The test power supply shall comply with 8.23.4.3 of GB/T14048.1-1993. 6.4.2.2 Power frequency withstand voltage test application position: a) between brush and metal frame;
b) between slip ring and yoke (applicable to double slip ring clutch); c) between coil and yoke (applicable to non-slip ring clutch). 6.4.2.3 The power frequency withstand voltage test of single slip ring clutch is only allowed to be carried out in the process room after the coil is installed in the yoke and before it is closed. The voltage application position is between the coil and the yoke (or the coil and the metal frame). 6.4.2.4 During the 1-minute power frequency withstand voltage test, if there is no breakdown or flashover phenomenon, it is considered qualified. 6.5 Temperature rise test
6.5.1 Basic test conditions
6.5.1.1 The measurement of ambient air temperature shall be carried out in accordance with 8.2.3.3.1 of GB/T14048.1-1993. And the temperature rise test shall be carried out in the ambient air temperature range of +10~+40℃, and the change of ambient air temperature during the test shall not exceed 10K. 6.5.1.2 The clutch temperature rise test should be carried out with the back of the yoke placed on an insulating plate. 6.5.2 The clutch temperature rise test should be carried out in accordance with 8.2.3.3.2 and 823.3.6 of GB/T14048.1-1993. The coil temperature rise measured by the resistance method should not exceed the provisions of Table 5.
6.6 Life test
6.6.1 Life test conditions
6.6.1.1 The clutch life test should be carried out in accordance with the conditions specified in Table 6. It is allowed to carry out the test only on clutches of specifications 5 and 10. 6.6.1.2 Brush life test conditions:
a) The brush should be installed vertically to the slip ring surface according to the size required by the drawing; b) The contact part between the brush and the slip ring should be lubricated by the oil splashed when the clutch rotates: The test speed is in accordance with the provisions of Table 6, and the test is only carried out on the two basic specifications of 10 and 25 clutches; c
d) The slip ring of the single slip ring clutch is connected to the positive pole and the yoke is connected to the negative pole. 6.6.2 Criteria for judging eligibility
6.6.2.1 After the clutch reaches the specified life: a) The inner and outer friction plates should remain intact, without any burns, and the total wear should not exceed 3% of the initial total weight; b) The resin should not crack or fall off, and the connectors and fasteners should not be loose; The flexibility of movement should meet the requirements of 5.3.3; c
The clutch should be able to withstand a 1s power frequency withstand voltage test of 2 times the rated insulation voltage without breakdown or flashover; d)
e) The temperature rise of the clutch should meet the requirements of 5.6. 6.6.2.2 After the brush reaches the specified life, the wear in the brush length direction shall not exceed 3mm. 7
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