JB/T 6491-2001 This standard is a revision of JB/T 6491-1992 "Counter-rotating twin-screw plastic extruder". During the revision, the technical requirements were modified; necessary additions and modifications were made to the test methods and inspection rules. This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of counter-rotating twin-screw plastic extruders. This standard applies to counter-rotating twin-screw plastic extruders that mainly process PVC plastic products. This standard was first released in December 1992, and this is the first revision. JB/T 6491-2001 Counter-rotating twin-screw plastic extruder JB/T6491-2001 Standard download and decompression password: www.bzxz.net

ICS83.200
G95
JB
Machinery Industry Standard of the People's Republic of China
JB/T6491-2001
Counter-rotating twin-screw plastics extrude2001-05-23Published
China Machinery Industry Federation
Published
2001-10-01Implementation
JB/T6491-2001
Foreword
This standard is a revision of JB/T6491-1992 "Counter-rotating twin-screw plastic extruder". Compared with the original standard, this standard has the following changes: The basic parameter table 1 and the technical requirements have been modified. Necessary supplements and modifications have been made to the test methods and inspection rules. This standard replaces JB/T6491-1992 from the date of implementation. This standard is proposed and managed by the Plastic Machinery Branch of the National Technical Committee for Standardization of Rubber and Plastic Machinery. The responsible drafting unit of this standard is Dalian Bingshan Rubber and Plastic Co., Ltd. The participating drafting units of this standard are Wuhan Plastic Machinery General Factory, Shandong Plastic Machinery Factory, and Dalian Plastic Machinery Research Institute. The main drafters of this standard are Luo Shaoning, He Guihong, Hu Hua, Wang Zhengming, and Li Xianglan. This standard was first issued in December 1992, and this is the first revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Counter-rotating twinserew plastics extruder
Counter-rotating twinserew plastics extruderJB/T6491-2001
Replaces JB/T6491-1992
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of counter-rotating twin-screw plastic extruders.
This standard applies to the counter-rotating twin-screw plastic extruder (hereinafter referred to as extruder) mainly for processing PVC plastic products. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990
GB/T 63881986
GB/T13306—1991
GB/T13384—1992
HG/T3228—1988
Basic parameters
3
Packaging storage and transportation pictorial signs
Transport packaging delivery and receipt signs
Signs
General technical conditions for packaging of electromechanical products
General technical conditions for rubber and plastic machinery painting The basic parameters should comply with the provisions of Table 1.
Table 1
Extruder Series
Pipes
Special-shaped materials
40
60
Made
Made
Sheets
HPVC-U
SPVC
Pipes
Special-shaped materials
Sheets
HPVC-U
SPVC
Screw Diameter
mm
>35~45
>55~65
Screw aspect ratio
16~30
Basic parameters approved by China Machinery Industry Federation on 2001-05-23
Output
kg/h
≥30
>15
>25
30
>40
>110
≥80
90
≥110
≥130
Specific flow rate
(kg/h)/(r/min)
≥0.50
>0.35
>0.45
0.60
≥0.75
1.89
≥1.55
1. 72
≥1.90
2.20
Actual specific power
kw/(kg/h）
≤0.16
Center height
mm
1000
1150
Implemented on 2001-10-01
80
90
100
110||tt| |120
130
140
Extruder Series
Pipes
Special Profiles
Sheets
Making
Granulates
HPVC-U
SPVC
Pipes
GranulatesHPVC-U
Pipes
Special Profiles
Sheets
Making||tt| |Grains
Grains
HPVC-U
SPVC
Sheets
Pipes
Pipes
Sheets
HPVC-U
SPVC
Screw diameter
mm
>7585
>85~95
>95~105
>105~110| |tt||>115~125
>125-135
>135~145
JB/T6491—2001
Table 1 (end)
Screw aspect ratio
16-30
Output
kg/h
>160
≥110
130
≥170||t t||230
≥240
280
≥300
≥260
≥200
>300
≥400
≥260
400
≥460
≥360
>520
800
Specific flow
(kg/h) /(r/min)
5.71
>3.65
4.50
6.07
≥6.20
≥6.36
8.00
7.88
10.40
≥5.26
6.25
>7.31
7.00
≥10.50
≥11.50
>9.00
≥13.00
13.30
Actual specific power
kw/ (kg/h)
≤0.16
Center height
mm
1000
1150
Products are mainly assessed for production, specific flow rate, and actual specific power that meet product quality requirements. During trial production and appraisal, the output should not be less than the values ??listed in Table 1: During batch production of the extruder, the output is assessed at 70% of the maximum speed (if a test head is used, the head pressure should be adjusted to a pressure above that specified in Table 2), and the output should reach 70% of the output specified in the table, but the specific flow rate should not be less than the specified value in Table 1, and the actual specific power should not be greater than the specified value in Table 1. Table 2 Head pressurebZxz.net
Extruded products
Head pressure MPa
Technical requirements
Special profiles
20
Pipes
15
Plate
>20
Hard particles
8
Products shall comply with the provisions of this standard and be manufactured in accordance with drawings and technical documents approved by the prescribed procedures. 4.1 Technical requirements for the whole machine
4.1.1 The extruder shall be easy to disassemble the screw and clean the internal flow channel. 4.1.2 Within the design speed range, it shall be able to adjust the speed smoothly and steplessly. 4.1.3 When there is no material in the barrel, the barrel heating system should heat the barrel to 170℃ within 2 hours. 2
Soft particles
5
JB/T6491—2001
4.1.4 Parts exposed to the outside that are dangerous to personal safety must be equipped with safety protection covers. 4.1.5 The electrical equipment should meet certain safety protection requirements to ensure the safety of operators and production: a) The insulation resistance of the power circuit and the protection circuit wire shall not be less than 1Mα; b) The cold insulation resistance of the electric heater shall not be less than 1MQ: c) The resistance of the connection conductor between the protection wire terminal and any exposed conductor part of the circuit equipment shall not be greater than 0.1Q; d) The electric heater shall be subjected to a withstand voltage test and shall not be broken down: e) There should be an emergency stop button on the operating cabinet. 4.1.6 The noise (sound pressure level) of the whole machine shall not exceed 85dB (A) 4.1.7 The appearance should be neat and the colors should be harmonious. The surface of the coating shall meet the requirements of 3.4.5.1 No. 2 "Appearance of Paint Film" in HG/T3228-1988. 4.2 Technical requirements for main parts
4.2.1 Screw
4.2.1.1 The material is nitrided steel, and other surface hardening process materials can also be used. 4.2.1.2 Surface treatment: For nitrided steel, the depth is not less than 0.4mm, the hardness is not less than 700HV, and the brittleness is not greater than level 2. For materials using other surface hardening processes, the requirements should not be lower than the corresponding indicators of nitrided steel. 4.2.1.3 The surface roughness Ra value of the outer diameter, root diameter, outer ring and both sides of the screw shuttle of the screw rod shall not exceed 1.6μm. 4.2.2 Barrel
4.2.2.1 The material is nitrided steel, and other surface hardening process materials can also be used. 4.2.2.2 Inner hole surface treatment: Nitriding steel, the depth is not less than 0.4mm, the hardness is not less than 700HV, and the brittleness is not greater than level 2: For materials using other surface hardening processes, the requirements should not be lower than the corresponding indicators of nitrided steel. 4.2.2.3 The surface roughness Ra value of the barrel inner hole is not greater than 1.6μm. 4.2.2.4 The error of the distance between the two inner holes of the barrel should be within ±0.08mm. 4.3 Technical requirements for general assembly
4.3.1 The clearance (difference in diameter) between the screw and the cylinder should comply with the provisions of Table 3. Table 3 Gap
Extruder series
Interval
Extruder series
Gap
40
0.20~0.25
100
0.30-0.42
65
0.20-0.35
110
0.30-0.48
80.85||t t||0.200.38
120，130
0.38-0.54
90
mm
0.30-0.38
140
0.40~0.60
4.3.2 When two screws are placed horizontally in the barrel, the screws and the cylinder are allowed to contact, but there should be no jamming or scratching during idling.
4.3.3 During idling, the reduction box should drive smoothly without abnormal noise, and the lubricating oil supply of each lubrication point should be sufficient. 4.3.4 There should be no leakage in each pipeline under working pressure. 5 Test methods and inspection rules
5.1 Test methods
5.1.1 Idle running test
EB/T6491-2001
After the machine is qualified in general assembly, lubricating oil is applied to the inner surface of the cylinder and the surface of the screw, and a low-speed idle running test of not less than 3 minutes is carried out. 5.1.2 Load running test
The load running test can only be carried out after the idle running test is qualified. 5.1.2.1 The load running test should be carried out under the condition that all process conditions are basically stable, and various parameters are tested. 5.1.2.2 The load running during the trial production and identification of new products must be linked with the auxiliary machine for producing a certain product. The continuous operation of the auxiliary machine without assessment of performance shall not be less than 2 hours, and various test parameters must be measured on the basis of qualified product quality. 5.1.2.3 The load running during the type inspection after mass production of products can be linked with the auxiliary machine according to the actual situation of the manufacturer, or the load test can be carried out with the test head. 5.1.3 Test conditions
5.1.3.1. Test materials
PVC powder is used.
5.1.3.2 Test equipment
The recommended test head equipment structure is shown in Figure 1. Section width
High temperature baked body pressure sensor
Material measuring device Thermoelectric device
The outlet diameter of the test head shall be as specified in Table 4.
Extrusion output αkg/h
Test head outlet diameter
mm
5.1.4 Test method
≤100
10~15
Controlled leakage hot
Figure 1
Table 4 Exit diameter
>100~300
15~25
>300~500
2030
>500
25~35
5.1.4.1 During idling, check whether there is interference between the screws and between the screw and the barrel. If necessary, after idling, remove the screw and visually check whether there is scratch on the screw and the barrel. 5.1.4.2 Output detection
When the product quality is qualified, the extruder is running and the process conditions are stable, the extruder products are sampled. The sampling time shall not be less than 1min. The measurement shall be made three times, and the average value shall be taken. Then the hourly output of the extruder is converted. If a test head is used, the above measurement shall be carried out according to Chapter 3 under the condition that the extruded material is well plasticized and the process conditions are stable. 5.1.4.3 Noise detection
JB/T 6491—2001
The noise of machine operation shall comply with the provisions of 4.1.6. The noise detector shall be used to measure the machine's operating surface at a distance of 1.0m from the machine and 1.55m above. Measure 6 points evenly and take the average value (turn off the auxiliary machine) 5.1.4.4 Speed ??detection
Measure the screw directly or indirectly with a speed measuring device. 5.1.4.5 The actual output power of the motor shall be measured by using a DC voltmeter and a DC ammeter for DC motors and a three-phase power meter for AC variable speed motors, and shall be calculated uniformly according to formula (1) and formula (2).
When using a DC motor, the measured output power of the motor is: Nx-VA
Where: Ng——measured output power of the motor, kW: --motor input voltage, V;
A—motor input current, A:
Efficiency of the motor at high speed:
Rated power of the motor
\“Rated voltage of the motor×rated current of the motor When using an AC variable speed motor, the measured output power of the motor is: Nmeasured-measured input power×2
Where: 2—efficiency of the motor at high speed (subject to the technical data of the motor). 5.1.4.6 Specific flow detection
The specific flow is calculated according to formula (3):
gQmeasured/nmeasured
Where: g——specific flow, (kg/h)/(r/min): Qfe—measured output, kg/h;
nactual
—measured speed, r/min.
5.1.4.7 Actual specific power detection
The actual specific power is calculated according to formula (4):
N\-Nactual measured/Qactual
Where: N-
—actual specific power, kW/(kg/h).
5.1.4.8 Screw detection
()
(2)
(3)
(4)
5.1.4.8.1 Surface Treatment inspection: Nitrided steel screws are tested for hardness, depth and rigidity of the nitrided layer using furnace samples; other material screws should also be tested with corresponding samples. 5.1.4.8.2
5.1.4.8.3
The surface roughness of the screw is tested by comparing with a sample block or using a roughness meter. The outer diameter of the screw is tested with an outer diameter micrometer. Inspection of the outer circle straightness of the screw: Place the screw on a platform and fix it so that it cannot rotate freely, then measure it with a feeler gauge. 1.4.8.4
The clearance between the outer circle of the screw and the platform, or place the screw on the V-shaped iron on the platform, use a dial indicator to measure the highest point of the screw calibration one by one, and then repeat the above process for each 90° rotation. 5
5.1.4.9 Inspection of machine cylinder
JB/T 6491—2001
5.1.4.9.1 Inspection of surface treatment: The nitrided steel machine cylinder shall be tested for the hardness, depth and cellularity of the nitrided layer with the furnace sample; other material machine cylinders shall also have corresponding samples for their inspection. 5.1.4.9.2. The surface roughness of the inner hole of the machine is tested with a sample block or a coarse particle size meter. 5.1.4.9.3 The diameter of the inner hole of the machine body is tested within 200mm from both ends of the machine body using an inner diameter dial indicator. 5.1.4.9.4 For the center distance between the two holes on the machine frame, use an inner diameter dial indicator to measure the distance between the two inner hole busbars on the plane of the center line of the two holes, and then subtract half of the sum of the diameters of the two inner holes. At least three points are measured within the 200mm range, and their arithmetic average is taken. 5.1.4.10 Electrical testing
5. 1. 4. 10. 1 yuan
The insulation resistance between the power circuit and the protection circuit wires is measured with a 500V megger. 5.1.4.10.2 The electric heater is heated first, and then the insulation resistance is measured with a 500V megger when cooled to room temperature. The resistance of the connecting conductors of the protective conductor terminals and any exposed conductor parts of the circuit equipment is measured with a ground resistance tester. 5.1.4.10.32
The electric heater should be heated first, and then pressurized to 1000V in a cold state (room temperature) for at least 1 second withstand voltage test 5. 1.4. 10. 4
working The current is not more than 20mA.
5.1.4.11 The painted surface shall be visually inspected.
5.2 Inspection Rules
5.2.1 Each product must be inspected by the quality inspection department of the manufacturer before it can leave the factory, and be accompanied by a product quality certificate. 5.2.2 Factory inspection
Each product should be tested according to 5.1.1 before leaving the factory, and inspected according to each item in 4.1.7 and 4.3. 5.2.3 Type test
Type test shall be carried out according to 5.1.1 and 5.1.2, and shall be inspected according to each item in 5.1.3 and 5.1.4. Type testing should be carried out in one of the following situations: a) Trial prototype identification when new or old products are transferred to the factory: b) After formal production, if there are major changes in structure, materials, processes, etc., which may affect product performance; c) During normal production, test benches must be sampled at least every year; d) After two years of product suspension, when production is resumed: e) When the factory inspection results are significantly different from the last type test; f) The national quality supervision agency proposes type test requirements hour. 5.2.4 One unit shall be inspected for each type test. If the unit fails to pass the inspection, another unit shall be tested. If it fails again, the type test shall be deemed to be unqualified.
6 Marking, packaging, transportation, storage
6.1 Each product should have a product label fixed at an appropriate and obvious location. The size and technical requirements of the label should comply with the regulations of GB/T13306. The product label should be Content should include:
a) Manufacturer’s name and trademark;
b) Product name:
c) Product model:
d) Manufacturing date and serial number: | |tt||e) Main parameters of the product.
6
JB/T6491-2001
6.2 Before product packaging, the exposed processing surfaces of machine parts and tools should be coated with rust inhibitor. 6.3 Product packaging should comply with the regulations of GB/T13384. 6.4 The following technical documents should be contained in the product packaging box (packed in a waterproof bag): a) Product certificate:
b) Product instruction manual;
c) Packing list.
6.5 Product transportation should comply with the regulations of GB191 and GB/T6388. 6.6 The product should be stored in a ventilated, dry place without fire sources or corrosive gases. If stored in the open air, rainproof measures should be taken.
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