JB/T 6492-2001 This standard is a revision of JB/T 6492-1992 "Conical Twin Screw Plastic Extruder". Compared with the original standard, some product specifications and technical indicators have been added; hardness requirements and roughness requirements have been improved; requirements for setting up emergency stopping devices for electrical equipment have been added. This standard specifies the definition, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of conical twin-screw plastic extruders. This standard applies to conical twin-screw plastic extruders that rotate outward in opposite directions. This standard was first released in December 1992, and this is the first revision. JB/T 6492-2001 Conical twin-screw plastic extruder JB/T6492-2001 Standard download and decompression password: www.bzxz.net

ICS83.200
G95
JB
Machinery Industry Standard of the People's Republic of China
JB/T6492-2001
Conical twin-screw plastic extruder| | tt | |tt||Foreword
This standard is a revision of B/T6492-1992 "Conical Twin Screw Plastic Extruder". Compared with the original standard, this standard has the following main changes: Table 2 has been added:
In Tables 1, 3, and 4, product specifications and technical indicators with nominal diameters of 55mm and 60mm at the small end of the screw have been added. —5.1.2.2 increases the nitriding hardness requirements of machine parts; —5.1.2.3 increases the roughness requirements of machine parts; —5.3.4d) increases the technical requirements for grounding resistance; 5.3.4e) adds setting electrical Requirements for equipment emergency shutdown devices: -4.1 and 6.1.3.1 specify the raw materials for testing and processing. Appendix A of this standard is a reminder appendix.
This standard replaces JB/T6492-1992 from the date of implementation. This standard was proposed and managed by the Plastic Machinery Branch of the National Technical Committee for Standardization of Rubber and Plastic Machinery. The unit responsible for drafting this standard: Shanghai Light Industry Machinery Co., Ltd. Extrusion Machinery Factory. Units participating in the drafting of this standard: Dalian Bingshan Rubber and Plastic Co., Ltd., Shandong Plastic and Rubber Machinery General Factory, Wuhan Plastic Machinery General Factory and Shanghai Shenweida Machinery Co., Ltd.
The main drafters of this standard: Liu Wenjun, Lu Xuexing, Yang Youyou, Wang Zhengming, Hu Hua, Tao Yuying, Liu Lin. This standard was first released in December 1992, and this is the first revision. 1 Range Circle
Machine Industry Standard of the People's Republic of China
Conical twin-screw plastic extruder
Conical twinserew plastics extruderJB/T6492—2001
replaces JB/T6492- 1992
This standard specifies the definition, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of chain twin-screw plastic extruders.
This standard applies to counter-rotating conical twin-screw plastic extruders (hereinafter referred to as extruders). 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB191—1990
GB/T 6388—1986
GB/T13306—1991
GB/T13384—1992
HG/T3228—1988
3 definition
Packaging, storage and transportation pictorial mark
Transportation packaging receipt and delivery mark
Signage
General technical conditions for mechanical and electrical product packaging
Rubber plastic machinery coating General technical conditions for paint This standard adopts the following definitions.
3.1 Screw little end nominal diameter screwlittleendnominaldiameter The nominal diameter of the screw outer cone small end based on the screw axis. 3.2 Screw big end nominal diameter screwbigendnominaldiameter The screw big end nominal diameter based on the screw axis. 3.3 Actual specific power is the ratio of the actual consumed drive motor power to the measured extrusion output. 3.4 Twin-conicalscrew is a screw whose outer diameter taper is greater than the bottom diameter taper. 4 Basic parameters
4.1 The basic parameters should comply with the requirements of Table 1 or Table 2. Table 1 is used for the assessment of ordinary screw extruders, and Table 2 is used for the assessment of biconical screw extruders. Hard polyurethane dry mixed powder is mainly used, and soft polyvinyl chloride dry mixed powder can also be extruded. 4.2 The basic parameters mainly evaluate the extrusion output, specific flow rate and actual specific power that meet the plasticizing quality requirements. Assessment of extrusion output: When signing for trial production of new products, the extrusion output should not be lower than the extrusion output listed in Table 1 or Table 2. For extruders produced in batches, the specific flow rate at 70% of the maximum speed should be no less than the specified value, and the actual specific power should not be greater than the specified value. The extrusion output should not be less than 70% of the value specified in Table 1 or Table 2.
China Machinery Industry Federation 2001-05-23 approved the implementation on 2001-10-01
Screw small end
Nominal diameter
d
mm| |tt||25
35
45
50
55
60
65
80||tt ||90
Screw mouthbzxZ.net
Nominal diameter
d
mm
25
35
45|| tt||50
55
60
65
80
92
5. Technical requirements
blasting rod The speed regulation ratio between the maximum and minimum rotation
speed:
6
The speed regulation ratio between the maximum and minimum screw rotation
speed
a6||tt ||JB/T6492-2001
Table 1 basic parameters
Extrusion output (PVC-U) Q
kg/h
24
> 55
70
120
>135
>170
>225
≥360
675||tt ||Table 2
Actual specific power N
kW/(kg/h)
≤0.14
Basic parameters
Extrusion output (PVC- U) Q
kg/h
>27
63
80
≥135
≥150
≥ 190
250
≥400
≥750
Actual specific power\
kwi (kg/h)
≤0.13|| tt||Specific flow rate.
(kg/h ) / (r/min)
0.30
1.22
≥1.55
3.75
≥3.88|| tt||≥4.47
≥6.62
≥9.73
≥19.3
Specific flow rate q
(kg/h) / (r/min )
≥0.34
1.40
≥1.78
≥4.13
≥4.50
≥5.60
>7.36|| tt||≥10.81
>22.79
Products should comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 5.1
Technical requirements for the complete machine
5.1.1 The barrel heating system should heat the barrel to 200°C within 2.5 hours. 5.1.2. Protective covers or obvious permanent warning signs must be installed in exposed parts that are dangerous to personal safety. The two screws should be able to adjust their speed smoothly and steplessly within the design speed range. 5.1.32
The electrical control system should have corresponding safety protection measures to ensure the safety of operators and the normal operation of the extruder. 5. 1.4
a) The insulation resistance between the power circuit and the protection circuit wire (extruder shell) shall not be less than 1MQ: center height H
mm
1000||tt| |1100
Center height H
mm
1000
1100
b) The electric heater should be heated first, and then in a cold state (room temperature) When measured, the insulation resistance shall not be less than 1MQ; c) The electric heater shall be heated first, and then conduct a withstand voltage test in a cold state (room temperature), and there shall be no breakdown: d) Any exposed external protective conductor terminals and electrical equipment The conductor resistance of the conductor parts shall not be greater than 0.1Qe) There should be an emergency stop button on the operation cabinet. 2
JB/T6492—2001
5.1.5 The noise of the whole machine (sound pressure level) shall not be greater than 85dB (A). 5.1.6 The extruder should be equipped with an over-torque protection device. 5.1.7 The appearance should be neat and tidy with harmonious colors. The painted surface should comply with 3.4.6. of HG/T3228! No. 2 "Paint film appearance" regulations. 5.2 Technical requirements for main components
5.2.1 Screw
5.2.1.1 Material: Use nitrided steel, other alloy structural steel, or spray coating or surfacing wear-resistant alloy on the threads. 5.2.1.2 Surface treatment: nitride the nitrided steel with a depth of not less than 0.4mm, a hardness of not less than 700HV, and a brittleness of 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. 5.2.1.3 Deviation: The nominal diameter deviation between the small end of the screw and the big end of the screw should comply with the requirements in Table 3. Table 3 Nominal diameter deviation
Screw small end diameter
Small end
Big screw,
Nominal diameter deviation
Upper
Down| |tt||25
35
0.04
45
0.05
5560
50
0||tt || 0.06 | 5.2.2 Barrel
80
0.10
5.2.2.1 Material: Nitride steel, other alloy structural steel or two tapered inner holes plus wear-resistant alloy Bushings etc. 90 | | tt | | mm | Below 800HV, the brittleness is not greater than level 2.
5.2.2.3 The surface roughness Ra value of the inner hole of the machine shall not be greater than 0.8 μm. 5.3 Technical requirements for final assembly
5.3.1 The gap between the screw and the machine shaft (after installation and debugging is completed) should comply with the requirements in Table 4. Table 4 Clearance
Screw small end
Nominal diameter

25
35
0.08-0.20
45
50
0.100.30
55||tt| |60
0.12-0.35
65
0.14-0.40
80
0.16-0.50
90
mm
92
0.18-0.60
5.3.2 When the two screws are placed horizontally, the barrel and the screw are allowed to contact inside the barrel. However, when running dry for a short period of time, the screw and the screw, and the screw and the machine must not be stuck or scratched. 5.3.3 Each pipeline should be well sealed. After final assembly, a pressure test should be conducted and there should be no leakage. 5.3.4 The lubrication system must have sufficient oil supply.
6 Test methods and inspection rules
6.1 Test methods
6.1.1 Dry running test
After the machine is successfully assembled, apply lubrication on the barrel and screw surfaces oil, and conduct a low-speed idling test for no less than 3 minutes. 6.1.2 Load operation test
6.1.2.1 The load operation test can only be carried out after passing the dry operation test. Various parameters should be tested under the condition that the process conditions are basically stable.
3
JB/T 64922001
6.1.2.2 The load operation during trial production and qualification of new products and the load operation during type testing after mass production of products should be linked with auxiliary machines or Use test machine head. The continuous operation time shall not be less than 2 hours, and various test parameters must be measured on the basis of qualified product quality or good plasticization.
6.1.3 Test conditions
6.1.3.1 Test raw materials
Use hard polyvinyl chloride dry mixed powder.
6.1.3.2 Test device
The recommended test head structure is shown in Figure 1. The machine head is equipped with a throttle valve, high-temperature melt pressure sensor, thermocouple and corresponding secondary instrument, or an instrument using a combination of pressure sensor and thermocouple. See Table 5 for outlet diameter. Throttle adjustment
High temperature baked body pressure sensing test
Measuring material alliance thermoelectric valve
Temperature control hot telephone
Figure 1
Table 5 outlet diameter
Extrusion output Q
kg/h
Test head outlet diameter d
mm
6.1.3.3 Testing instrument
100
10~15
For testing instruments, please refer to the regulations in Appendix A.
6.1.4 Test method
>100~300
1525
6.1.4.1 Remove the screw after dry operation and stop, and check whether the screw and machine are scratched Phenomenon. 6.1.4.2 Extrusion output detection
>300~500
20~30
>500
25~35
under stable process conditions , when the plastic is extruded from the machine head, use a stopwatch to time, 605 cuts the material strip once, a total of times, use a scale to weigh the weight of the plastic, take the average, and calculate the weight of the plastic extruded per hour, which is the extrusion Yield. When testing with a test machine head, the throttle valve of the machine head should be adjusted to a position greater than or equal to 15MPa, the material temperature should be less than or equal to 200°C, and the plasticization is good. 6.1.4.3 Temperature detection
Use the melt temperature measuring device to measure the material temperature. 6.1.4.4 Machine head pressure detection
JB/T6492—2001
Use a high-temperature melt pressure sensor, which should be calibrated before testing, and the sensor should have good reproducibility. 6.1.4.5 Speed ??detection
Use a speed measuring device to directly or indirectly measure the screw (the screw is allowed to be removed). 6.1.4.6 Motor measured output power detection: Use a DC voltmeter and DC ammeter to measure the DC motor: Measure the AC variable speed motor with a three-phase power meter, and calculate it uniformly according to equations (1) and (2). When using a DC motor, the measured output power of the motor is: Nactual adjustment-VAn
where: N-the measured output power of the motor, kW; V-the input voltage of the motor, V;
A——the input voltage of the motor Human current, A:
-motor efficiency at high speed;
motor rated power
% motor rated voltage × motor Yingding electro-hydraulic AC variable speed motor, the motor measured output power: N = measured input power × m
where: n-
- the efficiency of the motor at high speed (subject to the technical data of the motor). 6.1.4.7 Specific flow detection
The specific flow is calculated according to formula (3):
q actual measurement/n actual question
where: 9——specific flow rate, (kg/h )/(r/min); 9actual - measured extrusion output, kg/h; nactual#
-actually measured rotation speed, r/min.
6.1.4.8 Actual specific power detection
The actual specific power is calculated according to formula (4):
N\actual division=Nactual/C
where :N\actual
actual specific power, kW/(kg/h).
6.1.4.9 Screw and barrel surface treatment inspection When the screw and barrel are nitrided, the ammoniation hardness, nitriding depth and brittleness shall be tested with furnace samples. 6.1.4.10 Detection of limit deviation of the outer diameter of the big end of the screw (as shown in Figure 2) (1)
(2)
(3)
(4)
3 ) According to the outer diameter of the big end and the outer diameter of the small end of the screw and the effective thread working length of the screw, calculate the fixed value for the increase or decrease in the axial length of the thread;
b) Make a simple conical sleeve for measurement , the inner diameter of the big end is smaller than the outer diameter of the big end of the screw, so that the sleeve and the screw are kept at a distance of h after matching: c) Use a special measuring sleeve to fit on the big end of the screw as shown in Figure 2 to make it fit well and reach the outer diameter of the screw. at the mouth, so that the h distance is within the two end faces of A and B:
5
rod
special tapered sleeve
JB/T6492—2001||tt ||Figure 2
d) Use a measuring tool to measure the distance value from end face A to end face B; e) Use the measured distance value to calculate the big end of the screw according to equation (5) and equation (6) Limit deviation of outer diameter D: (D..-D)/2
tana
Where: hain-
Dain
Minimum distance between A and B end faces, mm:
One screw big end Minimum diameter, mm;
D—-Special taper sleeve big end inner hole size, mm; 9
Screw half cone angle, (°)
h||tt| |In the formula: the maximum distance between the end faces of huA and B, mm; Dmx—the maximum diameter of the screw big end, mm.
(Dm-Dm)/2
tanar
6.1.4.11 Limit deviation detection of screw small end outer diameter (as shown in Figure 3) (5)
(6)
a) Make two special tapered sleeves for measurement according to the outer diameter of the small end and the outer diameter of the big end of the dimensional screw and their limit deviations (the special dimensional sleeve for measuring the big end can also be shared);||tt ||b) Put the two measuring sleeves at the big end and the small end into the outer diameter D of the big end and the outer diameter d at the small end of the screw respectively as shown in Figure 3, so that the two sleeves fit well at the two parts of the screw: | |tt||6
JB/T6492—2001
Screw
Special dimensional sleeve
Figure 3
c) Use a measuring tool to measure the maximum The L distance from the end face of the end sleeve to the simple end face of the small end sleeve: d) Calculate the limit deviation of the d dimension based on the measured L distance value according to Equation (7) and Equation (8): (d... - d)/2
tana
(d.. dm)/2
tana
where: d
Lma
The inner hole size of the small end of the dimensional-shaped sleeve, mm+
The maximum end-face distance of the special tapered sleeve for measuring the large and small ends, mm: The minimum end-face distance of the special tapered sleeve for measuring the large and small ends, mm; one drawing The distance between the two end faces of the screw thread marked on. 6.1.4.12 Radial magnetic detection between the barrel and the two screws (7)
(8)
Disassemble the connecting sleeve between the screw tail and the reducer output shaft, and Push toward the reduction box, and then push the screw fully toward the small end of the barrel. Measure the distance between the end face of the connecting joint at the end of the screw and the end face of the reducer. Calculate the radial clearance according to formula (9): a-2csina
一Radial double-sided clearance, mm;
where:
The distance between the end face of the connecting joint at the end of a screw and the end face of the output shaft of the reduction box, mm. 6.1.4.13 Electrical testing
6.1.4.13.1 The insulation resistance between the power circuit and the protection circuit wire (extruder shell) is measured with a 500V megger. 6.1.4.13.2 The electric heater should be heated first, and then the insulation resistance measurement should be carried out in a cold state (room temperature). (9)
6.1.4.13.3 The electric heater should be heated first, and then conduct a withstand voltage test in a cold state (room temperature). Pressurize to 1000V, withstand voltage 15, and T operating current not greater than 20mA.
6.1.4.13.4 The resistance of the connecting conductor between the external protective conductor terminal and any conductive parts of the electrical equipment and the outer shell of the extruder is measured with a grounding resistance tester.
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